vendor/james-heinrich/getid3/getid3/module.audio-video.matroska.php

   1 <?php
   2 /////////////////////////////////////////////////////////////////
   3 /// getID3() by James Heinrich <info@getid3.org>               //
   4 //  available at http://getid3.sourceforge.net                 //
   5 //            or http://www.getid3.org                         //
   6 //          also https://github.com/JamesHeinrich/getID3       //
   7 /////////////////////////////////////////////////////////////////
   8 // See readme.txt for more details                             //
   9 /////////////////////////////////////////////////////////////////
  10 //                                                             //
  11 // module.audio-video.matriska.php                             //
  12 // module for analyzing Matroska containers                    //
  13 // dependencies: NONE                                          //
  14 //                                                            ///
  15 /////////////////////////////////////////////////////////////////
  16
  17
  18 define('EBML_ID_CHAPTERS',                  0x0043A770); // [10][43][A7][70] -- A system to define basic menus and partition data. For more detailed information, look at the Chapters Explanation.
  19 define('EBML_ID_SEEKHEAD',                  0x014D9B74); // [11][4D][9B][74] -- Contains the position of other level 1 elements.
  20 define('EBML_ID_TAGS',                      0x0254C367); // [12][54][C3][67] -- Element containing elements specific to Tracks/Chapters. A list of valid tags can be found <http://www.matroska.org/technical/specs/tagging/index.html>.
  21 define('EBML_ID_INFO',                      0x0549A966); // [15][49][A9][66] -- Contains miscellaneous general information and statistics on the file.
  22 define('EBML_ID_TRACKS',                    0x0654AE6B); // [16][54][AE][6B] -- A top-level block of information with many tracks described.
  23 define('EBML_ID_SEGMENT',                   0x08538067); // [18][53][80][67] -- This element contains all other top-level (level 1) elements. Typically a Matroska file is composed of 1 segment.
  24 define('EBML_ID_ATTACHMENTS',               0x0941A469); // [19][41][A4][69] -- Contain attached files.
  25 define('EBML_ID_EBML',                      0x0A45DFA3); // [1A][45][DF][A3] -- Set the EBML characteristics of the data to follow. Each EBML document has to start with this.
  26 define('EBML_ID_CUES',                      0x0C53BB6B); // [1C][53][BB][6B] -- A top-level element to speed seeking access. All entries are local to the segment.
  27 define('EBML_ID_CLUSTER',                   0x0F43B675); // [1F][43][B6][75] -- The lower level element containing the (monolithic) Block structure.
  28 define('EBML_ID_LANGUAGE',                    0x02B59C); //     [22][B5][9C] -- Specifies the language of the track in the Matroska languages form.
  29 define('EBML_ID_TRACKTIMECODESCALE',          0x03314F); //     [23][31][4F] -- The scale to apply on this track to work at normal speed in relation with other tracks (mostly used to adjust video speed when the audio length differs).
  30 define('EBML_ID_DEFAULTDURATION',             0x03E383); //     [23][E3][83] -- Number of nanoseconds (i.e. not scaled) per frame.
  31 define('EBML_ID_CODECNAME',                   0x058688); //     [25][86][88] -- A human-readable string specifying the codec.
  32 define('EBML_ID_CODECDOWNLOADURL',            0x06B240); //     [26][B2][40] -- A URL to download about the codec used.
  33 define('EBML_ID_TIMECODESCALE',               0x0AD7B1); //     [2A][D7][B1] -- Timecode scale in nanoseconds (1.000.000 means all timecodes in the segment are expressed in milliseconds).
  34 define('EBML_ID_COLOURSPACE',                 0x0EB524); //     [2E][B5][24] -- Same value as in AVI (32 bits).
  35 define('EBML_ID_GAMMAVALUE',                  0x0FB523); //     [2F][B5][23] -- Gamma Value.
  36 define('EBML_ID_CODECSETTINGS',               0x1A9697); //     [3A][96][97] -- A string describing the encoding setting used.
  37 define('EBML_ID_CODECINFOURL',                0x1B4040); //     [3B][40][40] -- A URL to find information about the codec used.
  38 define('EBML_ID_PREVFILENAME',                0x1C83AB); //     [3C][83][AB] -- An escaped filename corresponding to the previous segment.
  39 define('EBML_ID_PREVUID',                     0x1CB923); //     [3C][B9][23] -- A unique ID to identify the previous chained segment (128 bits).
  40 define('EBML_ID_NEXTFILENAME',                0x1E83BB); //     [3E][83][BB] -- An escaped filename corresponding to the next segment.
  41 define('EBML_ID_NEXTUID',                     0x1EB923); //     [3E][B9][23] -- A unique ID to identify the next chained segment (128 bits).
  42 define('EBML_ID_CONTENTCOMPALGO',               0x0254); //         [42][54] -- The compression algorithm used. Algorithms that have been specified so far are:
  43 define('EBML_ID_CONTENTCOMPSETTINGS',           0x0255); //         [42][55] -- Settings that might be needed by the decompressor. For Header Stripping (ContentCompAlgo=3), the bytes that were removed from the beggining of each frames of the track.
  44 define('EBML_ID_DOCTYPE',                       0x0282); //         [42][82] -- A string that describes the type of document that follows this EBML header ('matroska' in our case).
  45 define('EBML_ID_DOCTYPEREADVERSION',            0x0285); //         [42][85] -- The minimum DocType version an interpreter has to support to read this file.
  46 define('EBML_ID_EBMLVERSION',                   0x0286); //         [42][86] -- The version of EBML parser used to create the file.
  47 define('EBML_ID_DOCTYPEVERSION',                0x0287); //         [42][87] -- The version of DocType interpreter used to create the file.
  48 define('EBML_ID_EBMLMAXIDLENGTH',               0x02F2); //         [42][F2] -- The maximum length of the IDs you'll find in this file (4 or less in Matroska).
  49 define('EBML_ID_EBMLMAXSIZELENGTH',             0x02F3); //         [42][F3] -- The maximum length of the sizes you'll find in this file (8 or less in Matroska). This does not override the element size indicated at the beginning of an element. Elements that have an indicated size which is larger than what is allowed by EBMLMaxSizeLength shall be considered invalid.
  50 define('EBML_ID_EBMLREADVERSION',               0x02F7); //         [42][F7] -- The minimum EBML version a parser has to support to read this file.
  51 define('EBML_ID_CHAPLANGUAGE',                  0x037C); //         [43][7C] -- The languages corresponding to the string, in the bibliographic ISO-639-2 form.
  52 define('EBML_ID_CHAPCOUNTRY',                   0x037E); //         [43][7E] -- The countries corresponding to the string, same 2 octets as in Internet domains.
  53 define('EBML_ID_SEGMENTFAMILY',                 0x0444); //         [44][44] -- A randomly generated unique ID that all segments related to each other must use (128 bits).
  54 define('EBML_ID_DATEUTC',                       0x0461); //         [44][61] -- Date of the origin of timecode (value 0), i.e. production date.
  55 define('EBML_ID_TAGLANGUAGE',                   0x047A); //         [44][7A] -- Specifies the language of the tag specified, in the Matroska languages form.
  56 define('EBML_ID_TAGDEFAULT',                    0x0484); //         [44][84] -- Indication to know if this is the default/original language to use for the given tag.
  57 define('EBML_ID_TAGBINARY',                     0x0485); //         [44][85] -- The values of the Tag if it is binary. Note that this cannot be used in the same SimpleTag as TagString.
  58 define('EBML_ID_TAGSTRING',                     0x0487); //         [44][87] -- The value of the Tag.
  59 define('EBML_ID_DURATION',                      0x0489); //         [44][89] -- Duration of the segment (based on TimecodeScale).
  60 define('EBML_ID_CHAPPROCESSPRIVATE',            0x050D); //         [45][0D] -- Some optional data attached to the ChapProcessCodecID information. For ChapProcessCodecID = 1, it is the "DVD level" equivalent.
  61 define('EBML_ID_CHAPTERFLAGENABLED',            0x0598); //         [45][98] -- Specify wether the chapter is enabled. It can be enabled/disabled by a Control Track. When disabled, the movie should skip all the content between the TimeStart and TimeEnd of this chapter.
  62 define('EBML_ID_TAGNAME',                       0x05A3); //         [45][A3] -- The name of the Tag that is going to be stored.
  63 define('EBML_ID_EDITIONENTRY',                  0x05B9); //         [45][B9] -- Contains all information about a segment edition.
  64 define('EBML_ID_EDITIONUID',                    0x05BC); //         [45][BC] -- A unique ID to identify the edition. It's useful for tagging an edition.
  65 define('EBML_ID_EDITIONFLAGHIDDEN',             0x05BD); //         [45][BD] -- If an edition is hidden (1), it should not be available to the user interface (but still to Control Tracks).
  66 define('EBML_ID_EDITIONFLAGDEFAULT',            0x05DB); //         [45][DB] -- If a flag is set (1) the edition should be used as the default one.
  67 define('EBML_ID_EDITIONFLAGORDERED',            0x05DD); //         [45][DD] -- Specify if the chapters can be defined multiple times and the order to play them is enforced.
  68 define('EBML_ID_FILEDATA',                      0x065C); //         [46][5C] -- The data of the file.
  69 define('EBML_ID_FILEMIMETYPE',                  0x0660); //         [46][60] -- MIME type of the file.
  70 define('EBML_ID_FILENAME',                      0x066E); //         [46][6E] -- Filename of the attached file.
  71 define('EBML_ID_FILEREFERRAL',                  0x0675); //         [46][75] -- A binary value that a track/codec can refer to when the attachment is needed.
  72 define('EBML_ID_FILEDESCRIPTION',               0x067E); //         [46][7E] -- A human-friendly name for the attached file.
  73 define('EBML_ID_FILEUID',                       0x06AE); //         [46][AE] -- Unique ID representing the file, as random as possible.
  74 define('EBML_ID_CONTENTENCALGO',                0x07E1); //         [47][E1] -- The encryption algorithm used. The value '0' means that the contents have not been encrypted but only signed. Predefined values:
  75 define('EBML_ID_CONTENTENCKEYID',               0x07E2); //         [47][E2] -- For public key algorithms this is the ID of the public key the the data was encrypted with.
  76 define('EBML_ID_CONTENTSIGNATURE',              0x07E3); //         [47][E3] -- A cryptographic signature of the contents.
  77 define('EBML_ID_CONTENTSIGKEYID',               0x07E4); //         [47][E4] -- This is the ID of the private key the data was signed with.
  78 define('EBML_ID_CONTENTSIGALGO',                0x07E5); //         [47][E5] -- The algorithm used for the signature. A value of '0' means that the contents have not been signed but only encrypted. Predefined values:
  79 define('EBML_ID_CONTENTSIGHASHALGO',            0x07E6); //         [47][E6] -- The hash algorithm used for the signature. A value of '0' means that the contents have not been signed but only encrypted. Predefined values:
  80 define('EBML_ID_MUXINGAPP',                     0x0D80); //         [4D][80] -- Muxing application or library ("libmatroska-0.4.3").
  81 define('EBML_ID_SEEK',                          0x0DBB); //         [4D][BB] -- Contains a single seek entry to an EBML element.
  82 define('EBML_ID_CONTENTENCODINGORDER',          0x1031); //         [50][31] -- Tells when this modification was used during encoding/muxing starting with 0 and counting upwards. The decoder/demuxer has to start with the highest order number it finds and work its way down. This value has to be unique over all ContentEncodingOrder elements in the segment.
  83 define('EBML_ID_CONTENTENCODINGSCOPE',          0x1032); //         [50][32] -- A bit field that describes which elements have been modified in this way. Values (big endian) can be OR'ed. Possible values:
  84 define('EBML_ID_CONTENTENCODINGTYPE',           0x1033); //         [50][33] -- A value describing what kind of transformation has been done. Possible values:
  85 define('EBML_ID_CONTENTCOMPRESSION',            0x1034); //         [50][34] -- Settings describing the compression used. Must be present if the value of ContentEncodingType is 0 and absent otherwise. Each block must be decompressable even if no previous block is available in order not to prevent seeking.
  86 define('EBML_ID_CONTENTENCRYPTION',             0x1035); //         [50][35] -- Settings describing the encryption used. Must be present if the value of ContentEncodingType is 1 and absent otherwise.
  87 define('EBML_ID_CUEREFNUMBER',                  0x135F); //         [53][5F] -- Number of the referenced Block of Track X in the specified Cluster.
  88 define('EBML_ID_NAME',                          0x136E); //         [53][6E] -- A human-readable track name.
  89 define('EBML_ID_CUEBLOCKNUMBER',                0x1378); //         [53][78] -- Number of the Block in the specified Cluster.
  90 define('EBML_ID_TRACKOFFSET',                   0x137F); //         [53][7F] -- A value to add to the Block's Timecode. This can be used to adjust the playback offset of a track.
  91 define('EBML_ID_SEEKID',                        0x13AB); //         [53][AB] -- The binary ID corresponding to the element name.
  92 define('EBML_ID_SEEKPOSITION',                  0x13AC); //         [53][AC] -- The position of the element in the segment in octets (0 = first level 1 element).
  93 define('EBML_ID_STEREOMODE',                    0x13B8); //         [53][B8] -- Stereo-3D video mode.
  94 define('EBML_ID_OLDSTEREOMODE',                 0x13B9); //         [53][B9] -- Bogus StereoMode value used in old versions of libmatroska. DO NOT USE. (0: mono, 1: right eye, 2: left eye, 3: both eyes).
  95 define('EBML_ID_PIXELCROPBOTTOM',               0x14AA); //         [54][AA] -- The number of video pixels to remove at the bottom of the image (for HDTV content).
  96 define('EBML_ID_DISPLAYWIDTH',                  0x14B0); //         [54][B0] -- Width of the video frames to display.
  97 define('EBML_ID_DISPLAYUNIT',                   0x14B2); //         [54][B2] -- Type of the unit for DisplayWidth/Height (0: pixels, 1: centimeters, 2: inches).
  98 define('EBML_ID_ASPECTRATIOTYPE',               0x14B3); //         [54][B3] -- Specify the possible modifications to the aspect ratio (0: free resizing, 1: keep aspect ratio, 2: fixed).
  99 define('EBML_ID_DISPLAYHEIGHT',                 0x14BA); //         [54][BA] -- Height of the video frames to display.
 100 define('EBML_ID_PIXELCROPTOP',                  0x14BB); //         [54][BB] -- The number of video pixels to remove at the top of the image.
 101 define('EBML_ID_PIXELCROPLEFT',                 0x14CC); //         [54][CC] -- The number of video pixels to remove on the left of the image.
 102 define('EBML_ID_PIXELCROPRIGHT',                0x14DD); //         [54][DD] -- The number of video pixels to remove on the right of the image.
 103 define('EBML_ID_FLAGFORCED',                    0x15AA); //         [55][AA] -- Set if that track MUST be used during playback. There can be many forced track for a kind (audio, video or subs), the player should select the one which language matches the user preference or the default + forced track. Overlay MAY happen between a forced and non-forced track of the same kind.
 104 define('EBML_ID_MAXBLOCKADDITIONID',            0x15EE); //         [55][EE] -- The maximum value of BlockAddID. A value 0 means there is no BlockAdditions for this track.
 105 define('EBML_ID_WRITINGAPP',                    0x1741); //         [57][41] -- Writing application ("mkvmerge-0.3.3").
 106 define('EBML_ID_CLUSTERSILENTTRACKS',           0x1854); //         [58][54] -- The list of tracks that are not used in that part of the stream. It is useful when using overlay tracks on seeking. Then you should decide what track to use.
 107 define('EBML_ID_CLUSTERSILENTTRACKNUMBER',      0x18D7); //         [58][D7] -- One of the track number that are not used from now on in the stream. It could change later if not specified as silent in a further Cluster.
 108 define('EBML_ID_ATTACHEDFILE',                  0x21A7); //         [61][A7] -- An attached file.
 109 define('EBML_ID_CONTENTENCODING',               0x2240); //         [62][40] -- Settings for one content encoding like compression or encryption.
 110 define('EBML_ID_BITDEPTH',                      0x2264); //         [62][64] -- Bits per sample, mostly used for PCM.
 111 define('EBML_ID_CODECPRIVATE',                  0x23A2); //         [63][A2] -- Private data only known to the codec.
 112 define('EBML_ID_TARGETS',                       0x23C0); //         [63][C0] -- Contain all UIDs where the specified meta data apply. It is void to describe everything in the segment.
 113 define('EBML_ID_CHAPTERPHYSICALEQUIV',          0x23C3); //         [63][C3] -- Specify the physical equivalent of this ChapterAtom like "DVD" (60) or "SIDE" (50), see complete list of values.
 114 define('EBML_ID_TAGCHAPTERUID',                 0x23C4); //         [63][C4] -- A unique ID to identify the Chapter(s) the tags belong to. If the value is 0 at this level, the tags apply to all chapters in the Segment.
 115 define('EBML_ID_TAGTRACKUID',                   0x23C5); //         [63][C5] -- A unique ID to identify the Track(s) the tags belong to. If the value is 0 at this level, the tags apply to all tracks in the Segment.
 116 define('EBML_ID_TAGATTACHMENTUID',              0x23C6); //         [63][C6] -- A unique ID to identify the Attachment(s) the tags belong to. If the value is 0 at this level, the tags apply to all the attachments in the Segment.
 117 define('EBML_ID_TAGEDITIONUID',                 0x23C9); //         [63][C9] -- A unique ID to identify the EditionEntry(s) the tags belong to. If the value is 0 at this level, the tags apply to all editions in the Segment.
 118 define('EBML_ID_TARGETTYPE',                    0x23CA); //         [63][CA] -- An informational string that can be used to display the logical level of the target like "ALBUM", "TRACK", "MOVIE", "CHAPTER", etc (see TargetType).
 119 define('EBML_ID_TRACKTRANSLATE',                0x2624); //         [66][24] -- The track identification for the given Chapter Codec.
 120 define('EBML_ID_TRACKTRANSLATETRACKID',         0x26A5); //         [66][A5] -- The binary value used to represent this track in the chapter codec data. The format depends on the ChapProcessCodecID used.
 121 define('EBML_ID_TRACKTRANSLATECODEC',           0x26BF); //         [66][BF] -- The chapter codec using this ID (0: Matroska Script, 1: DVD-menu).
 122 define('EBML_ID_TRACKTRANSLATEEDITIONUID',      0x26FC); //         [66][FC] -- Specify an edition UID on which this translation applies. When not specified, it means for all editions found in the segment.
 123 define('EBML_ID_SIMPLETAG',                     0x27C8); //         [67][C8] -- Contains general information about the target.
 124 define('EBML_ID_TARGETTYPEVALUE',               0x28CA); //         [68][CA] -- A number to indicate the logical level of the target (see TargetType).
 125 define('EBML_ID_CHAPPROCESSCOMMAND',            0x2911); //         [69][11] -- Contains all the commands associated to the Atom.
 126 define('EBML_ID_CHAPPROCESSTIME',               0x2922); //         [69][22] -- Defines when the process command should be handled (0: during the whole chapter, 1: before starting playback, 2: after playback of the chapter).
 127 define('EBML_ID_CHAPTERTRANSLATE',              0x2924); //         [69][24] -- A tuple of corresponding ID used by chapter codecs to represent this segment.
 128 define('EBML_ID_CHAPPROCESSDATA',               0x2933); //         [69][33] -- Contains the command information. The data should be interpreted depending on the ChapProcessCodecID value. For ChapProcessCodecID = 1, the data correspond to the binary DVD cell pre/post commands.
 129 define('EBML_ID_CHAPPROCESS',                   0x2944); //         [69][44] -- Contains all the commands associated to the Atom.
 130 define('EBML_ID_CHAPPROCESSCODECID',            0x2955); //         [69][55] -- Contains the type of the codec used for the processing. A value of 0 means native Matroska processing (to be defined), a value of 1 means the DVD command set is used. More codec IDs can be added later.
 131 define('EBML_ID_CHAPTERTRANSLATEID',            0x29A5); //         [69][A5] -- The binary value used to represent this segment in the chapter codec data. The format depends on the ChapProcessCodecID used.
 132 define('EBML_ID_CHAPTERTRANSLATECODEC',         0x29BF); //         [69][BF] -- The chapter codec using this ID (0: Matroska Script, 1: DVD-menu).
 133 define('EBML_ID_CHAPTERTRANSLATEEDITIONUID',    0x29FC); //         [69][FC] -- Specify an edition UID on which this correspondance applies. When not specified, it means for all editions found in the segment.
 134 define('EBML_ID_CONTENTENCODINGS',              0x2D80); //         [6D][80] -- Settings for several content encoding mechanisms like compression or encryption.
 135 define('EBML_ID_MINCACHE',                      0x2DE7); //         [6D][E7] -- The minimum number of frames a player should be able to cache during playback. If set to 0, the reference pseudo-cache system is not used.
 136 define('EBML_ID_MAXCACHE',                      0x2DF8); //         [6D][F8] -- The maximum cache size required to store referenced frames in and the current frame. 0 means no cache is needed.
 137 define('EBML_ID_CHAPTERSEGMENTUID',             0x2E67); //         [6E][67] -- A segment to play in place of this chapter. Edition ChapterSegmentEditionUID should be used for this segment, otherwise no edition is used.
 138 define('EBML_ID_CHAPTERSEGMENTEDITIONUID',      0x2EBC); //         [6E][BC] -- The edition to play from the segment linked in ChapterSegmentUID.
 139 define('EBML_ID_TRACKOVERLAY',                  0x2FAB); //         [6F][AB] -- Specify that this track is an overlay track for the Track specified (in the u-integer). That means when this track has a gap (see SilentTracks) the overlay track should be used instead. The order of multiple TrackOverlay matters, the first one is the one that should be used. If not found it should be the second, etc.
 140 define('EBML_ID_TAG',                           0x3373); //         [73][73] -- Element containing elements specific to Tracks/Chapters.
 141 define('EBML_ID_SEGMENTFILENAME',               0x3384); //         [73][84] -- A filename corresponding to this segment.
 142 define('EBML_ID_SEGMENTUID',                    0x33A4); //         [73][A4] -- A randomly generated unique ID to identify the current segment between many others (128 bits).
 143 define('EBML_ID_CHAPTERUID',                    0x33C4); //         [73][C4] -- A unique ID to identify the Chapter.
 144 define('EBML_ID_TRACKUID',                      0x33C5); //         [73][C5] -- A unique ID to identify the Track. This should be kept the same when making a direct stream copy of the Track to another file.
 145 define('EBML_ID_ATTACHMENTLINK',                0x3446); //         [74][46] -- The UID of an attachment that is used by this codec.
 146 define('EBML_ID_CLUSTERBLOCKADDITIONS',         0x35A1); //         [75][A1] -- Contain additional blocks to complete the main one. An EBML parser that has no knowledge of the Block structure could still see and use/skip these data.
 147 define('EBML_ID_CHANNELPOSITIONS',              0x347B); //         [7D][7B] -- Table of horizontal angles for each successive channel, see appendix.
 148 define('EBML_ID_OUTPUTSAMPLINGFREQUENCY',       0x38B5); //         [78][B5] -- Real output sampling frequency in Hz (used for SBR techniques).
 149 define('EBML_ID_TITLE',                         0x3BA9); //         [7B][A9] -- General name of the segment.
 150 define('EBML_ID_CHAPTERDISPLAY',                  0x00); //             [80] -- Contains all possible strings to use for the chapter display.
 151 define('EBML_ID_TRACKTYPE',                       0x03); //             [83] -- A set of track types coded on 8 bits (1: video, 2: audio, 3: complex, 0x10: logo, 0x11: subtitle, 0x12: buttons, 0x20: control).
 152 define('EBML_ID_CHAPSTRING',                      0x05); //             [85] -- Contains the string to use as the chapter atom.
 153 define('EBML_ID_CODECID',                         0x06); //             [86] -- An ID corresponding to the codec, see the codec page for more info.
 154 define('EBML_ID_FLAGDEFAULT',                     0x08); //             [88] -- Set if that track (audio, video or subs) SHOULD be used if no language found matches the user preference.
 155 define('EBML_ID_CHAPTERTRACKNUMBER',              0x09); //             [89] -- UID of the Track to apply this chapter too. In the absense of a control track, choosing this chapter will select the listed Tracks and deselect unlisted tracks. Absense of this element indicates that the Chapter should be applied to any currently used Tracks.
 156 define('EBML_ID_CLUSTERSLICES',                   0x0E); //             [8E] -- Contains slices description.
 157 define('EBML_ID_CHAPTERTRACK',                    0x0F); //             [8F] -- List of tracks on which the chapter applies. If this element is not present, all tracks apply
 158 define('EBML_ID_CHAPTERTIMESTART',                0x11); //             [91] -- Timecode of the start of Chapter (not scaled).
 159 define('EBML_ID_CHAPTERTIMEEND',                  0x12); //             [92] -- Timecode of the end of Chapter (timecode excluded, not scaled).
 160 define('EBML_ID_CUEREFTIME',                      0x16); //             [96] -- Timecode of the referenced Block.
 161 define('EBML_ID_CUEREFCLUSTER',                   0x17); //             [97] -- Position of the Cluster containing the referenced Block.
 162 define('EBML_ID_CHAPTERFLAGHIDDEN',               0x18); //             [98] -- If a chapter is hidden (1), it should not be available to the user interface (but still to Control Tracks).
 163 define('EBML_ID_FLAGINTERLACED',                  0x1A); //             [9A] -- Set if the video is interlaced.
 164 define('EBML_ID_CLUSTERBLOCKDURATION',            0x1B); //             [9B] -- The duration of the Block (based on TimecodeScale). This element is mandatory when DefaultDuration is set for the track. When not written and with no DefaultDuration, the value is assumed to be the difference between the timecode of this Block and the timecode of the next Block in "display" order (not coding order). This element can be useful at the end of a Track (as there is not other Block available), or when there is a break in a track like for subtitle tracks.
 165 define('EBML_ID_FLAGLACING',                      0x1C); //             [9C] -- Set if the track may contain blocks using lacing.
 166 define('EBML_ID_CHANNELS',                        0x1F); //             [9F] -- Numbers of channels in the track.
 167 define('EBML_ID_CLUSTERBLOCKGROUP',               0x20); //             [A0] -- Basic container of information containing a single Block or BlockVirtual, and information specific to that Block/VirtualBlock.
 168 define('EBML_ID_CLUSTERBLOCK',                    0x21); //             [A1] -- Block containing the actual data to be rendered and a timecode relative to the Cluster Timecode.
 169 define('EBML_ID_CLUSTERBLOCKVIRTUAL',             0x22); //             [A2] -- A Block with no data. It must be stored in the stream at the place the real Block should be in display order.
 170 define('EBML_ID_CLUSTERSIMPLEBLOCK',              0x23); //             [A3] -- Similar to Block but without all the extra information, mostly used to reduced overhead when no extra feature is needed.
 171 define('EBML_ID_CLUSTERCODECSTATE',               0x24); //             [A4] -- The new codec state to use. Data interpretation is private to the codec. This information should always be referenced by a seek entry.
 172 define('EBML_ID_CLUSTERBLOCKADDITIONAL',          0x25); //             [A5] -- Interpreted by the codec as it wishes (using the BlockAddID).
 173 define('EBML_ID_CLUSTERBLOCKMORE',                0x26); //             [A6] -- Contain the BlockAdditional and some parameters.
 174 define('EBML_ID_CLUSTERPOSITION',                 0x27); //             [A7] -- Position of the Cluster in the segment (0 in live broadcast streams). It might help to resynchronise offset on damaged streams.
 175 define('EBML_ID_CODECDECODEALL',                  0x2A); //             [AA] -- The codec can decode potentially damaged data.
 176 define('EBML_ID_CLUSTERPREVSIZE',                 0x2B); //             [AB] -- Size of the previous Cluster, in octets. Can be useful for backward playing.
 177 define('EBML_ID_TRACKENTRY',                      0x2E); //             [AE] -- Describes a track with all elements.
 178 define('EBML_ID_CLUSTERENCRYPTEDBLOCK',           0x2F); //             [AF] -- Similar to SimpleBlock but the data inside the Block are Transformed (encrypt and/or signed).
 179 define('EBML_ID_PIXELWIDTH',                      0x30); //             [B0] -- Width of the encoded video frames in pixels.
 180 define('EBML_ID_CUETIME',                         0x33); //             [B3] -- Absolute timecode according to the segment time base.
 181 define('EBML_ID_SAMPLINGFREQUENCY',               0x35); //             [B5] -- Sampling frequency in Hz.
 182 define('EBML_ID_CHAPTERATOM',                     0x36); //             [B6] -- Contains the atom information to use as the chapter atom (apply to all tracks).
 183 define('EBML_ID_CUETRACKPOSITIONS',               0x37); //             [B7] -- Contain positions for different tracks corresponding to the timecode.
 184 define('EBML_ID_FLAGENABLED',                     0x39); //             [B9] -- Set if the track is used.
 185 define('EBML_ID_PIXELHEIGHT',                     0x3A); //             [BA] -- Height of the encoded video frames in pixels.
 186 define('EBML_ID_CUEPOINT',                        0x3B); //             [BB] -- Contains all information relative to a seek point in the segment.
 187 define('EBML_ID_CRC32',                           0x3F); //             [BF] -- The CRC is computed on all the data of the Master element it's in, regardless of its position. It's recommended to put the CRC value at the beggining of the Master element for easier reading. All level 1 elements should include a CRC-32.
 188 define('EBML_ID_CLUSTERBLOCKADDITIONID',          0x4B); //             [CB] -- The ID of the BlockAdditional element (0 is the main Block).
 189 define('EBML_ID_CLUSTERLACENUMBER',               0x4C); //             [CC] -- The reverse number of the frame in the lace (0 is the last frame, 1 is the next to last, etc). While there are a few files in the wild with this element, it is no longer in use and has been deprecated. Being able to interpret this element is not required for playback.
 190 define('EBML_ID_CLUSTERFRAMENUMBER',              0x4D); //             [CD] -- The number of the frame to generate from this lace with this delay (allow you to generate many frames from the same Block/Frame).
 191 define('EBML_ID_CLUSTERDELAY',                    0x4E); //             [CE] -- The (scaled) delay to apply to the element.
 192 define('EBML_ID_CLUSTERDURATION',                 0x4F); //             [CF] -- The (scaled) duration to apply to the element.
 193 define('EBML_ID_TRACKNUMBER',                     0x57); //             [D7] -- The track number as used in the Block Header (using more than 127 tracks is not encouraged, though the design allows an unlimited number).
 194 define('EBML_ID_CUEREFERENCE',                    0x5B); //             [DB] -- The Clusters containing the required referenced Blocks.
 195 define('EBML_ID_VIDEO',                           0x60); //             [E0] -- Video settings.
 196 define('EBML_ID_AUDIO',                           0x61); //             [E1] -- Audio settings.
 197 define('EBML_ID_CLUSTERTIMESLICE',                0x68); //             [E8] -- Contains extra time information about the data contained in the Block. While there are a few files in the wild with this element, it is no longer in use and has been deprecated. Being able to interpret this element is not required for playback.
 198 define('EBML_ID_CUECODECSTATE',                   0x6A); //             [EA] -- The position of the Codec State corresponding to this Cue element. 0 means that the data is taken from the initial Track Entry.
 199 define('EBML_ID_CUEREFCODECSTATE',                0x6B); //             [EB] -- The position of the Codec State corresponding to this referenced element. 0 means that the data is taken from the initial Track Entry.
 200 define('EBML_ID_VOID',                            0x6C); //             [EC] -- Used to void damaged data, to avoid unexpected behaviors when using damaged data. The content is discarded. Also used to reserve space in a sub-element for later use.
 201 define('EBML_ID_CLUSTERTIMECODE',                 0x67); //             [E7] -- Absolute timecode of the cluster (based on TimecodeScale).
 202 define('EBML_ID_CLUSTERBLOCKADDID',               0x6E); //             [EE] -- An ID to identify the BlockAdditional level.
 203 define('EBML_ID_CUECLUSTERPOSITION',              0x71); //             [F1] -- The position of the Cluster containing the required Block.
 204 define('EBML_ID_CUETRACK',                        0x77); //             [F7] -- The track for which a position is given.
 205 define('EBML_ID_CLUSTERREFERENCEPRIORITY',        0x7A); //             [FA] -- This frame is referenced and has the specified cache priority. In cache only a frame of the same or higher priority can replace this frame. A value of 0 means the frame is not referenced.
 206 define('EBML_ID_CLUSTERREFERENCEBLOCK',           0x7B); //             [FB] -- Timecode of another frame used as a reference (ie: B or P frame). The timecode is relative to the block it's attached to.
 207 define('EBML_ID_CLUSTERREFERENCEVIRTUAL',         0x7D); //             [FD] -- Relative position of the data that should be in position of the virtual block.
 208
 209
 210 /**
 211 * @tutorial http://www.matroska.org/technical/specs/index.html
 212 *
 213 * @todo Rewrite EBML parser to reduce it's size and honor default element values
 214 * @todo After rewrite implement stream size calculation, that will provide additional useful info and enable AAC/FLAC audio bitrate detection
 215 */
 216 class getid3_matroska extends getid3_handler
 217 {
 218         // public options
 219         public static $hide_clusters    = true;  // if true, do not return information about CLUSTER chunks, since there's a lot of them and they're not usually useful [default: TRUE]
 220         public static $parse_whole_file = false; // true to parse the whole file, not only header [default: FALSE]
 221
 222         // private parser settings/placeholders
 223         private $EBMLbuffer        = '';
 224         private $EBMLbuffer_offset = 0;
 225         private $EBMLbuffer_length = 0;
 226         private $current_offset    = 0;
 227         private $unuseful_elements = array(EBML_ID_CRC32, EBML_ID_VOID);
 228
 229         public function Analyze()
 230         {
 231                 $info = &$this->getid3->info;
 232
 233                 // parse container
 234                 try {
 235                         $this->parseEBML($info);
 236                 } catch (Exception $e) {
 237                         $this->error('EBML parser: '.$e->getMessage());
 238                 }
 239
 240                 // calculate playtime
 241                 if (isset($info['matroska']['info']) && is_array($info['matroska']['info'])) {
 242                         foreach ($info['matroska']['info'] as $key => $infoarray) {
 243                                 if (isset($infoarray['Duration'])) {
 244                                         // TimecodeScale is how many nanoseconds each Duration unit is
 245                                         $info['playtime_seconds'] = $infoarray['Duration'] * ((isset($infoarray['TimecodeScale']) ? $infoarray['TimecodeScale'] : 1000000) / 1000000000);
 246                                         break;
 247                                 }
 248                         }
 249                 }
 250
 251                 // extract tags
 252                 if (isset($info['matroska']['tags']) && is_array($info['matroska']['tags'])) {
 253                         foreach ($info['matroska']['tags'] as $key => $infoarray) {
 254                                 $this->ExtractCommentsSimpleTag($infoarray);
 255                         }
 256                 }
 257
 258                 // process tracks
 259                 if (isset($info['matroska']['tracks']['tracks']) && is_array($info['matroska']['tracks']['tracks'])) {
 260                         foreach ($info['matroska']['tracks']['tracks'] as $key => $trackarray) {
 261
 262                                 $track_info = array();
 263                                 $track_info['dataformat'] = self::CodecIDtoCommonName($trackarray['CodecID']);
 264                                 $track_info['default'] = (isset($trackarray['FlagDefault']) ? $trackarray['FlagDefault'] : true);
 265                                 if (isset($trackarray['Name'])) { $track_info['name'] = $trackarray['Name']; }
 266
 267                                 switch ($trackarray['TrackType']) {
 268
 269                                         case 1: // Video
 270                                                 $track_info['resolution_x'] = $trackarray['PixelWidth'];
 271                                                 $track_info['resolution_y'] = $trackarray['PixelHeight'];
 272                                                 $track_info['display_unit'] = self::displayUnit(isset($trackarray['DisplayUnit']) ? $trackarray['DisplayUnit'] : 0);
 273                                                 $track_info['display_x']    = (isset($trackarray['DisplayWidth']) ? $trackarray['DisplayWidth'] : $trackarray['PixelWidth']);
 274                                                 $track_info['display_y']    = (isset($trackarray['DisplayHeight']) ? $trackarray['DisplayHeight'] : $trackarray['PixelHeight']);
 275
 276                                                 if (isset($trackarray['PixelCropBottom'])) { $track_info['crop_bottom'] = $trackarray['PixelCropBottom']; }
 277                                                 if (isset($trackarray['PixelCropTop']))    { $track_info['crop_top']    = $trackarray['PixelCropTop']; }
 278                                                 if (isset($trackarray['PixelCropLeft']))   { $track_info['crop_left']   = $trackarray['PixelCropLeft']; }
 279                                                 if (isset($trackarray['PixelCropRight']))  { $track_info['crop_right']  = $trackarray['PixelCropRight']; }
 280                                                 if (isset($trackarray['DefaultDuration'])) { $track_info['frame_rate']  = round(1000000000 / $trackarray['DefaultDuration'], 3); }
 281                                                 if (isset($trackarray['CodecName']))       { $track_info['codec']       = $trackarray['CodecName']; }
 282
 283                                                 switch ($trackarray['CodecID']) {
 284                                                         case 'V_MS/VFW/FOURCC':
 285                                                                 getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
 286
 287                                                                 $parsed = getid3_riff::ParseBITMAPINFOHEADER($trackarray['CodecPrivate']);
 288                                                                 $track_info['codec'] = getid3_riff::fourccLookup($parsed['fourcc']);
 289                                                                 $info['matroska']['track_codec_parsed'][$trackarray['TrackNumber']] = $parsed;
 290                                                                 break;
 291
 292                                                         /*case 'V_MPEG4/ISO/AVC':
 293                                                                 $h264['profile']    = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], 1, 1));
 294                                                                 $h264['level']      = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], 3, 1));
 295                                                                 $rn                 = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], 4, 1));
 296                                                                 $h264['NALUlength'] = ($rn & 3) + 1;
 297                                                                 $rn                 = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], 5, 1));
 298                                                                 $nsps               = ($rn & 31);
 299                                                                 $offset             = 6;
 300                                                                 for ($i = 0; $i < $nsps; $i ++) {
 301                                                                         $length        = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], $offset, 2));
 302                                                                         $h264['SPS'][] = substr($trackarray['CodecPrivate'], $offset + 2, $length);
 303                                                                         $offset       += 2 + $length;
 304                                                                 }
 305                                                                 $npps               = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], $offset, 1));
 306                                                                 $offset            += 1;
 307                                                                 for ($i = 0; $i < $npps; $i ++) {
 308                                                                         $length        = getid3_lib::BigEndian2Int(substr($trackarray['CodecPrivate'], $offset, 2));
 309                                                                         $h264['PPS'][] = substr($trackarray['CodecPrivate'], $offset + 2, $length);
 310                                                                         $offset       += 2 + $length;
 311                                                                 }
 312                                                                 $info['matroska']['track_codec_parsed'][$trackarray['TrackNumber']] = $h264;
 313                                                                 break;*/
 314                                                 }
 315
 316                                                 $info['video']['streams'][] = $track_info;
 317                                                 break;
 318
 319                                         case 2: // Audio
 320                                                 $track_info['sample_rate'] = (isset($trackarray['SamplingFrequency']) ? $trackarray['SamplingFrequency'] : 8000.0);
 321                                                 $track_info['channels']    = (isset($trackarray['Channels']) ? $trackarray['Channels'] : 1);
 322                                                 $track_info['language']    = (isset($trackarray['Language']) ? $trackarray['Language'] : 'eng');
 323                                                 if (isset($trackarray['BitDepth']))  { $track_info['bits_per_sample'] = $trackarray['BitDepth']; }
 324                                                 if (isset($trackarray['CodecName'])) { $track_info['codec']           = $trackarray['CodecName']; }
 325
 326                                                 switch ($trackarray['CodecID']) {
 327                                                         case 'A_PCM/INT/LIT':
 328                                                         case 'A_PCM/INT/BIG':
 329                                                                 $track_info['bitrate'] = $trackarray['SamplingFrequency'] * $trackarray['Channels'] * $trackarray['BitDepth'];
 330                                                                 break;
 331
 332                                                         case 'A_AC3':
 333                                                         case 'A_EAC3':
 334                                                         case 'A_DTS':
 335                                                         case 'A_MPEG/L3':
 336                                                         case 'A_MPEG/L2':
 337                                                         case 'A_FLAC':
 338                                                                 $module_dataformat = ($track_info['dataformat'] == 'mp2' ? 'mp3' : ($track_info['dataformat'] == 'eac3' ? 'ac3' : $track_info['dataformat']));
 339                                                                 getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.'.$module_dataformat.'.php', __FILE__, true);
 340
 341                                                                 if (!isset($info['matroska']['track_data_offsets'][$trackarray['TrackNumber']])) {
 342                                                                         $this->warning('Unable to parse audio data ['.basename(__FILE__).':'.__LINE__.'] because $info[matroska][track_data_offsets]['.$trackarray['TrackNumber'].'] not set');
 343                                                                         break;
 344                                                                 }
 345
 346                                                                 // create temp instance
 347                                                                 $getid3_temp = new getID3();
 348                                                                 if ($track_info['dataformat'] != 'flac') {
 349                                                                         $getid3_temp->openfile($this->getid3->filename);
 350                                                                 }
 351                                                                 $getid3_temp->info['avdataoffset'] = $info['matroska']['track_data_offsets'][$trackarray['TrackNumber']]['offset'];
 352                                                                 if ($track_info['dataformat'][0] == 'm' || $track_info['dataformat'] == 'flac') {
 353                                                                         $getid3_temp->info['avdataend'] = $info['matroska']['track_data_offsets'][$trackarray['TrackNumber']]['offset'] + $info['matroska']['track_data_offsets'][$trackarray['TrackNumber']]['length'];
 354                                                                 }
 355
 356                                                                 // analyze
 357                                                                 $class = 'getid3_'.$module_dataformat;
 358                                                                 $header_data_key = $track_info['dataformat'][0] == 'm' ? 'mpeg' : $track_info['dataformat'];
 359                                                                 $getid3_audio = new $class($getid3_temp, __CLASS__);
 360                                                                 if ($track_info['dataformat'] == 'flac') {
 361                                                                         $getid3_audio->AnalyzeString($trackarray['CodecPrivate']);
 362                                                                 }
 363                                                                 else {
 364                                                                         $getid3_audio->Analyze();
 365                                                                 }
 366                                                                 if (!empty($getid3_temp->info[$header_data_key])) {
 367                                                                         $info['matroska']['track_codec_parsed'][$trackarray['TrackNumber']] = $getid3_temp->info[$header_data_key];
 368                                                                         if (isset($getid3_temp->info['audio']) && is_array($getid3_temp->info['audio'])) {
 369                                                                                 foreach ($getid3_temp->info['audio'] as $key => $value) {
 370                                                                                         $track_info[$key] = $value;
 371                                                                                 }
 372                                                                         }
 373                                                                 }
 374                                                                 else {
 375                                                                         $this->warning('Unable to parse audio data ['.basename(__FILE__).':'.__LINE__.'] because '.$class.'::Analyze() failed at offset '.$getid3_temp->info['avdataoffset']);
 376                                                                 }
 377
 378                                                                 // copy errors and warnings
 379                                                                 if (!empty($getid3_temp->info['error'])) {
 380                                                                         foreach ($getid3_temp->info['error'] as $newerror) {
 381                                                                                 $this->warning($class.'() says: ['.$newerror.']');
 382                                                                         }
 383                                                                 }
 384                                                                 if (!empty($getid3_temp->info['warning'])) {
 385                                                                         foreach ($getid3_temp->info['warning'] as $newerror) {
 386                                                                                 $this->warning($class.'() says: ['.$newerror.']');
 387                                                                         }
 388                                                                 }
 389                                                                 unset($getid3_temp, $getid3_audio);
 390                                                                 break;
 391
 392                                                         case 'A_AAC':
 393                                                         case 'A_AAC/MPEG2/LC':
 394                                                         case 'A_AAC/MPEG2/LC/SBR':
 395                                                         case 'A_AAC/MPEG4/LC':
 396                                                         case 'A_AAC/MPEG4/LC/SBR':
 397                                                                 $this->warning($trackarray['CodecID'].' audio data contains no header, audio/video bitrates can\'t be calculated');
 398                                                                 break;
 399
 400                                                         case 'A_VORBIS':
 401                                                                 if (!isset($trackarray['CodecPrivate'])) {
 402                                                                         $this->warning('Unable to parse audio data ['.basename(__FILE__).':'.__LINE__.'] because CodecPrivate data not set');
 403                                                                         break;
 404                                                                 }
 405                                                                 $vorbis_offset = strpos($trackarray['CodecPrivate'], 'vorbis', 1);
 406                                                                 if ($vorbis_offset === false) {
 407                                                                         $this->warning('Unable to parse audio data ['.basename(__FILE__).':'.__LINE__.'] because CodecPrivate data does not contain "vorbis" keyword');
 408                                                                         break;
 409                                                                 }
 410                                                                 $vorbis_offset -= 1;
 411
 412                                                                 getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.ogg.php', __FILE__, true);
 413
 414                                                                 // create temp instance
 415                                                                 $getid3_temp = new getID3();
 416
 417                                                                 // analyze
 418                                                                 $getid3_ogg = new getid3_ogg($getid3_temp);
 419                                                                 $oggpageinfo['page_seqno'] = 0;
 420                                                                 $getid3_ogg->ParseVorbisPageHeader($trackarray['CodecPrivate'], $vorbis_offset, $oggpageinfo);
 421                                                                 if (!empty($getid3_temp->info['ogg'])) {
 422                                                                         $info['matroska']['track_codec_parsed'][$trackarray['TrackNumber']] = $getid3_temp->info['ogg'];
 423                                                                         if (isset($getid3_temp->info['audio']) && is_array($getid3_temp->info['audio'])) {
 424                                                                                 foreach ($getid3_temp->info['audio'] as $key => $value) {
 425                                                                                         $track_info[$key] = $value;
 426                                                                                 }
 427                                                                         }
 428                                                                 }
 429
 430                                                                 // copy errors and warnings
 431                                                                 if (!empty($getid3_temp->info['error'])) {
 432                                                                         foreach ($getid3_temp->info['error'] as $newerror) {
 433                                                                                 $this->warning('getid3_ogg() says: ['.$newerror.']');
 434                                                                         }
 435                                                                 }
 436                                                                 if (!empty($getid3_temp->info['warning'])) {
 437                                                                         foreach ($getid3_temp->info['warning'] as $newerror) {
 438                                                                                 $this->warning('getid3_ogg() says: ['.$newerror.']');
 439                                                                         }
 440                                                                 }
 441
 442                                                                 if (!empty($getid3_temp->info['ogg']['bitrate_nominal'])) {
 443                                                                         $track_info['bitrate'] = $getid3_temp->info['ogg']['bitrate_nominal'];
 444                                                                 }
 445                                                                 unset($getid3_temp, $getid3_ogg, $oggpageinfo, $vorbis_offset);
 446                                                                 break;
 447
 448                                                         case 'A_MS/ACM':
 449                                                                 getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
 450
 451                                                                 $parsed = getid3_riff::parseWAVEFORMATex($trackarray['CodecPrivate']);
 452                                                                 foreach ($parsed as $key => $value) {
 453                                                                         if ($key != 'raw') {
 454                                                                                 $track_info[$key] = $value;
 455                                                                         }
 456                                                                 }
 457                                                                 $info['matroska']['track_codec_parsed'][$trackarray['TrackNumber']] = $parsed;
 458                                                                 break;
 459
 460                                                         default:
 461                                                                 $this->warning('Unhandled audio type "'.(isset($trackarray['CodecID']) ? $trackarray['CodecID'] : '').'"');
 462                                                                 break;
 463                                                 }
 464
 465                                                 $info['audio']['streams'][] = $track_info;
 466                                                 break;
 467                                 }
 468                         }
 469
 470                         if (!empty($info['video']['streams'])) {
 471                                 $info['video'] = self::getDefaultStreamInfo($info['video']['streams']);
 472                         }
 473                         if (!empty($info['audio']['streams'])) {
 474                                 $info['audio'] = self::getDefaultStreamInfo($info['audio']['streams']);
 475                         }
 476                 }
 477
 478                 // process attachments
 479                 if (isset($info['matroska']['attachments']) && $this->getid3->option_save_attachments !== getID3::ATTACHMENTS_NONE) {
 480                         foreach ($info['matroska']['attachments'] as $i => $entry) {
 481                                 if (strpos($entry['FileMimeType'], 'image/') === 0 && !empty($entry['FileData'])) {
 482                                         $info['matroska']['comments']['picture'][] = array('data' => $entry['FileData'], 'image_mime' => $entry['FileMimeType'], 'filename' => $entry['FileName']);
 483                                 }
 484                         }
 485                 }
 486
 487                 // determine mime type
 488                 if (!empty($info['video']['streams'])) {
 489                         $info['mime_type'] = ($info['matroska']['doctype'] == 'webm' ? 'video/webm' : 'video/x-matroska');
 490                 } elseif (!empty($info['audio']['streams'])) {
 491                         $info['mime_type'] = ($info['matroska']['doctype'] == 'webm' ? 'audio/webm' : 'audio/x-matroska');
 492                 } elseif (isset($info['mime_type'])) {
 493                         unset($info['mime_type']);
 494                 }
 495
 496                 return true;
 497         }
 498
 499         private function parseEBML(&$info) {
 500                 // http://www.matroska.org/technical/specs/index.html#EBMLBasics
 501                 $this->current_offset = $info['avdataoffset'];
 502
 503                 while ($this->getEBMLelement($top_element, $info['avdataend'])) {
 504                         switch ($top_element['id']) {
 505
 506                                 case EBML_ID_EBML:
 507                                         $info['matroska']['header']['offset'] = $top_element['offset'];
 508                                         $info['matroska']['header']['length'] = $top_element['length'];
 509
 510                                         while ($this->getEBMLelement($element_data, $top_element['end'], true)) {
 511                                                 switch ($element_data['id']) {
 512
 513                                                         case EBML_ID_EBMLVERSION:
 514                                                         case EBML_ID_EBMLREADVERSION:
 515                                                         case EBML_ID_EBMLMAXIDLENGTH:
 516                                                         case EBML_ID_EBMLMAXSIZELENGTH:
 517                                                         case EBML_ID_DOCTYPEVERSION:
 518                                                         case EBML_ID_DOCTYPEREADVERSION:
 519                                                                 $element_data['data'] = getid3_lib::BigEndian2Int($element_data['data']);
 520                                                                 break;
 521
 522                                                         case EBML_ID_DOCTYPE:
 523                                                                 $element_data['data'] = getid3_lib::trimNullByte($element_data['data']);
 524                                                                 $info['matroska']['doctype'] = $element_data['data'];
 525                                                                 $info['fileformat'] = $element_data['data'];
 526                                                                 break;
 527
 528                                                         default:
 529                                                                 $this->unhandledElement('header', __LINE__, $element_data);
 530                                                                 break;
 531                                                 }
 532
 533                                                 unset($element_data['offset'], $element_data['end']);
 534                                                 $info['matroska']['header']['elements'][] = $element_data;
 535                                         }
 536                                         break;
 537
 538                                 case EBML_ID_SEGMENT:
 539                                         $info['matroska']['segment'][0]['offset'] = $top_element['offset'];
 540                                         $info['matroska']['segment'][0]['length'] = $top_element['length'];
 541
 542                                         while ($this->getEBMLelement($element_data, $top_element['end'])) {
 543                                                 if ($element_data['id'] != EBML_ID_CLUSTER || !self::$hide_clusters) { // collect clusters only if required
 544                                                         $info['matroska']['segments'][] = $element_data;
 545                                                 }
 546                                                 switch ($element_data['id']) {
 547
 548                                                         case EBML_ID_SEEKHEAD: // Contains the position of other level 1 elements.
 549
 550                                                                 while ($this->getEBMLelement($seek_entry, $element_data['end'])) {
 551                                                                         switch ($seek_entry['id']) {
 552
 553                                                                                 case EBML_ID_SEEK: // Contains a single seek entry to an EBML element
 554                                                                                         while ($this->getEBMLelement($sub_seek_entry, $seek_entry['end'], true)) {
 555
 556                                                                                                 switch ($sub_seek_entry['id']) {
 557
 558                                                                                                         case EBML_ID_SEEKID:
 559                                                                                                                 $seek_entry['target_id']   = self::EBML2Int($sub_seek_entry['data']);
 560                                                                                                                 $seek_entry['target_name'] = self::EBMLidName($seek_entry['target_id']);
 561                                                                                                                 break;
 562
 563                                                                                                         case EBML_ID_SEEKPOSITION:
 564                                                                                                                 $seek_entry['target_offset'] = $element_data['offset'] + getid3_lib::BigEndian2Int($sub_seek_entry['data']);
 565                                                                                                                 break;
 566
 567                                                                                                         default:
 568                                                                                                                 $this->unhandledElement('seekhead.seek', __LINE__, $sub_seek_entry);                                                                                            }
 569                                                                                                                 break;
 570                                                                                         }
 571                                                                                         if (!isset($seek_entry['target_id'])) {
 572                                                                                                 $this->warning('seek_entry[target_id] unexpectedly not set at '.$seek_entry['offset']);
 573                                                                                                 break;
 574                                                                                         }
 575                                                                                         if (($seek_entry['target_id'] != EBML_ID_CLUSTER) || !self::$hide_clusters) { // collect clusters only if required
 576                                                                                                 $info['matroska']['seek'][] = $seek_entry;
 577                                                                                         }
 578                                                                                         break;
 579
 580                                                                                 default:
 581                                                                                         $this->unhandledElement('seekhead', __LINE__, $seek_entry);
 582                                                                                         break;
 583                                                                         }
 584                                                                 }
 585                                                                 break;
 586
 587                                                         case EBML_ID_TRACKS: // A top-level block of information with many tracks described.
 588                                                                 $info['matroska']['tracks'] = $element_data;
 589
 590                                                                 while ($this->getEBMLelement($track_entry, $element_data['end'])) {
 591                                                                         switch ($track_entry['id']) {
 592
 593                                                                                 case EBML_ID_TRACKENTRY: //subelements: Describes a track with all elements.
 594
 595                                                                                         while ($this->getEBMLelement($subelement, $track_entry['end'], array(EBML_ID_VIDEO, EBML_ID_AUDIO, EBML_ID_CONTENTENCODINGS, EBML_ID_CODECPRIVATE))) {
 596                                                                                                 switch ($subelement['id']) {
 597
 598                                                                                                         case EBML_ID_TRACKNUMBER:
 599                                                                                                         case EBML_ID_TRACKUID:
 600                                                                                                         case EBML_ID_TRACKTYPE:
 601                                                                                                         case EBML_ID_MINCACHE:
 602                                                                                                         case EBML_ID_MAXCACHE:
 603                                                                                                         case EBML_ID_MAXBLOCKADDITIONID:
 604                                                                                                         case EBML_ID_DEFAULTDURATION: // nanoseconds per frame
 605                                                                                                                 $track_entry[$subelement['id_name']] = getid3_lib::BigEndian2Int($subelement['data']);
 606                                                                                                                 break;
 607
 608                                                                                                         case EBML_ID_TRACKTIMECODESCALE:
 609                                                                                                                 $track_entry[$subelement['id_name']] = getid3_lib::BigEndian2Float($subelement['data']);
 610                                                                                                                 break;
 611
 612                                                                                                         case EBML_ID_CODECID:
 613                                                                                                         case EBML_ID_LANGUAGE:
 614                                                                                                         case EBML_ID_NAME:
 615                                                                                                         case EBML_ID_CODECNAME:
 616                                                                                                                 $track_entry[$subelement['id_name']] = getid3_lib::trimNullByte($subelement['data']);
 617                                                                                                                 break;
 618
 619                                                                                                         case EBML_ID_CODECPRIVATE:
 620                                                                                                                 $track_entry[$subelement['id_name']] = $this->readEBMLelementData($subelement['length'], true);
 621                                                                                                                 break;
 622
 623                                                                                                         case EBML_ID_FLAGENABLED:
 624                                                                                                         case EBML_ID_FLAGDEFAULT:
 625                                                                                                         case EBML_ID_FLAGFORCED:
 626                                                                                                         case EBML_ID_FLAGLACING:
 627                                                                                                         case EBML_ID_CODECDECODEALL:
 628                                                                                                                 $track_entry[$subelement['id_name']] = (bool) getid3_lib::BigEndian2Int($subelement['data']);
 629                                                                                                                 break;
 630
 631                                                                                                         case EBML_ID_VIDEO:
 632
 633                                                                                                                 while ($this->getEBMLelement($sub_subelement, $subelement['end'], true)) {
 634                                                                                                                         switch ($sub_subelement['id']) {
 635
 636                                                                                                                                 case EBML_ID_PIXELWIDTH:
 637                                                                                                                                 case EBML_ID_PIXELHEIGHT:
 638                                                                                                                                 case EBML_ID_PIXELCROPBOTTOM:
 639                                                                                                                                 case EBML_ID_PIXELCROPTOP:
 640                                                                                                                                 case EBML_ID_PIXELCROPLEFT:
 641                                                                                                                                 case EBML_ID_PIXELCROPRIGHT:
 642                                                                                                                                 case EBML_ID_DISPLAYWIDTH:
 643                                                                                                                                 case EBML_ID_DISPLAYHEIGHT:
 644                                                                                                                                 case EBML_ID_DISPLAYUNIT:
 645                                                                                                                                 case EBML_ID_ASPECTRATIOTYPE:
 646                                                                                                                                 case EBML_ID_STEREOMODE:
 647                                                                                                                                 case EBML_ID_OLDSTEREOMODE:
 648                                                                                                                                         $track_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
 649                                                                                                                                         break;
 650
 651                                                                                                                                 case EBML_ID_FLAGINTERLACED:
 652                                                                                                                                         $track_entry[$sub_subelement['id_name']] = (bool)getid3_lib::BigEndian2Int($sub_subelement['data']);
 653                                                                                                                                         break;
 654
 655                                                                                                                                 case EBML_ID_GAMMAVALUE:
 656                                                                                                                                         $track_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Float($sub_subelement['data']);
 657                                                                                                                                         break;
 658
 659                                                                                                                                 case EBML_ID_COLOURSPACE:
 660                                                                                                                                         $track_entry[$sub_subelement['id_name']] = getid3_lib::trimNullByte($sub_subelement['data']);
 661                                                                                                                                         break;
 662
 663                                                                                                                                 default:
 664                                                                                                                                         $this->unhandledElement('track.video', __LINE__, $sub_subelement);
 665                                                                                                                                         break;
 666                                                                                                                         }
 667                                                                                                                 }
 668                                                                                                                 break;
 669
 670                                                                                                         case EBML_ID_AUDIO:
 671
 672                                                                                                                 while ($this->getEBMLelement($sub_subelement, $subelement['end'], true)) {
 673                                                                                                                         switch ($sub_subelement['id']) {
 674
 675                                                                                                                                 case EBML_ID_CHANNELS:
 676                                                                                                                                 case EBML_ID_BITDEPTH:
 677                                                                                                                                         $track_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
 678                                                                                                                                         break;
 679
 680                                                                                                                                 case EBML_ID_SAMPLINGFREQUENCY:
 681                                                                                                                                 case EBML_ID_OUTPUTSAMPLINGFREQUENCY:
 682                                                                                                                                         $track_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Float($sub_subelement['data']);
 683                                                                                                                                         break;
 684
 685                                                                                                                                 case EBML_ID_CHANNELPOSITIONS:
 686                                                                                                                                         $track_entry[$sub_subelement['id_name']] = getid3_lib::trimNullByte($sub_subelement['data']);
 687                                                                                                                                         break;
 688
 689                                                                                                                                 default:
 690                                                                                                                                         $this->unhandledElement('track.audio', __LINE__, $sub_subelement);
 691                                                                                                                                         break;
 692                                                                                                                         }
 693                                                                                                                 }
 694                                                                                                                 break;
 695
 696                                                                                                         case EBML_ID_CONTENTENCODINGS:
 697
 698                                                                                                                 while ($this->getEBMLelement($sub_subelement, $subelement['end'])) {
 699                                                                                                                         switch ($sub_subelement['id']) {
 700
 701                                                                                                                                 case EBML_ID_CONTENTENCODING:
 702
 703                                                                                                                                         while ($this->getEBMLelement($sub_sub_subelement, $sub_subelement['end'], array(EBML_ID_CONTENTCOMPRESSION, EBML_ID_CONTENTENCRYPTION))) {
 704                                                                                                                                                 switch ($sub_sub_subelement['id']) {
 705
 706                                                                                                                                                         case EBML_ID_CONTENTENCODINGORDER:
 707                                                                                                                                                         case EBML_ID_CONTENTENCODINGSCOPE:
 708                                                                                                                                                         case EBML_ID_CONTENTENCODINGTYPE:
 709                                                                                                                                                                 $track_entry[$sub_subelement['id_name']][$sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
 710                                                                                                                                                                 break;
 711
 712                                                                                                                                                         case EBML_ID_CONTENTCOMPRESSION:
 713
 714                                                                                                                                                                 while ($this->getEBMLelement($sub_sub_sub_subelement, $sub_sub_subelement['end'], true)) {
 715                                                                                                                                                                         switch ($sub_sub_sub_subelement['id']) {
 716
 717                                                                                                                                                                                 case EBML_ID_CONTENTCOMPALGO:
 718                                                                                                                                                                                         $track_entry[$sub_subelement['id_name']][$sub_sub_subelement['id_name']][$sub_sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_sub_subelement['data']);
 719                                                                                                                                                                                         break;
 720
 721                                                                                                                                                                                 case EBML_ID_CONTENTCOMPSETTINGS:
 722                                                                                                                                                                                         $track_entry[$sub_subelement['id_name']][$sub_sub_subelement['id_name']][$sub_sub_sub_subelement['id_name']] = $sub_sub_sub_subelement['data'];
 723                                                                                                                                                                                         break;
 724
 725                                                                                                                                                                                 default:
 726                                                                                                                                                                                         $this->unhandledElement('track.contentencodings.contentencoding.contentcompression', __LINE__, $sub_sub_sub_subelement);
 727                                                                                                                                                                                         break;
 728                                                                                                                                                                         }
 729                                                                                                                                                                 }
 730                                                                                                                                                                 break;
 731
 732                                                                                                                                                         case EBML_ID_CONTENTENCRYPTION:
 733
 734                                                                                                                                                                 while ($this->getEBMLelement($sub_sub_sub_subelement, $sub_sub_subelement['end'], true)) {
 735                                                                                                                                                                         switch ($sub_sub_sub_subelement['id']) {
 736
 737                                                                                                                                                                                 case EBML_ID_CONTENTENCALGO:
 738                                                                                                                                                                                 case EBML_ID_CONTENTSIGALGO:
 739                                                                                                                                                                                 case EBML_ID_CONTENTSIGHASHALGO:
 740                                                                                                                                                                                         $track_entry[$sub_subelement['id_name']][$sub_sub_subelement['id_name']][$sub_sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_sub_subelement['data']);
 741                                                                                                                                                                                         break;
 742
 743                                                                                                                                                                                 case EBML_ID_CONTENTENCKEYID:
 744                                                                                                                                                                                 case EBML_ID_CONTENTSIGNATURE:
 745                                                                                                                                                                                 case EBML_ID_CONTENTSIGKEYID:
 746                                                                                                                                                                                         $track_entry[$sub_subelement['id_name']][$sub_sub_subelement['id_name']][$sub_sub_sub_subelement['id_name']] = $sub_sub_sub_subelement['data'];
 747                                                                                                                                                                                         break;
 748
 749                                                                                                                                                                                 default:
 750                                                                                                                                                                                         $this->unhandledElement('track.contentencodings.contentencoding.contentcompression', __LINE__, $sub_sub_sub_subelement);
 751                                                                                                                                                                                         break;
 752                                                                                                                                                                         }
 753                                                                                                                                                                 }
 754                                                                                                                                                                 break;
 755
 756                                                                                                                                                         default:
 757                                                                                                                                                                 $this->unhandledElement('track.contentencodings.contentencoding', __LINE__, $sub_sub_subelement);
 758                                                                                                                                                                 break;
 759                                                                                                                                                 }
 760                                                                                                                                         }
 761                                                                                                                                         break;
 762
 763                                                                                                                                 default:
 764                                                                                                                                         $this->unhandledElement('track.contentencodings', __LINE__, $sub_subelement);
 765                                                                                                                                         break;
 766                                                                                                                         }
 767                                                                                                                 }
 768                                                                                                                 break;
 769
 770                                                                                                         default:
 771                                                                                                                 $this->unhandledElement('track', __LINE__, $subelement);
 772                                                                                                                 break;
 773                                                                                                 }
 774                                                                                         }
 775
 776                                                                                         $info['matroska']['tracks']['tracks'][] = $track_entry;
 777                                                                                         break;
 778
 779                                                                                 default:
 780                                                                                         $this->unhandledElement('tracks', __LINE__, $track_entry);
 781                                                                                         break;
 782                                                                         }
 783                                                                 }
 784                                                                 break;
 785
 786                                                         case EBML_ID_INFO: // Contains miscellaneous general information and statistics on the file.
 787                                                                 $info_entry = array();
 788
 789                                                                 while ($this->getEBMLelement($subelement, $element_data['end'], true)) {
 790                                                                         switch ($subelement['id']) {
 791
 792                                                                                 case EBML_ID_TIMECODESCALE:
 793                                                                                         $info_entry[$subelement['id_name']] = getid3_lib::BigEndian2Int($subelement['data']);
 794                                                                                         break;
 795
 796                                                                                 case EBML_ID_DURATION:
 797                                                                                         $info_entry[$subelement['id_name']] = getid3_lib::BigEndian2Float($subelement['data']);
 798                                                                                         break;
 799
 800                                                                                 case EBML_ID_DATEUTC:
 801                                                                                         $info_entry[$subelement['id_name']]         = getid3_lib::BigEndian2Int($subelement['data']);
 802                                                                                         $info_entry[$subelement['id_name'].'_unix'] = self::EBMLdate2unix($info_entry[$subelement['id_name']]);
 803                                                                                         break;
 804
 805                                                                                 case EBML_ID_SEGMENTUID:
 806                                                                                 case EBML_ID_PREVUID:
 807                                                                                 case EBML_ID_NEXTUID:
 808                                                                                         $info_entry[$subelement['id_name']] = getid3_lib::trimNullByte($subelement['data']);
 809                                                                                         break;
 810
 811                                                                                 case EBML_ID_SEGMENTFAMILY:
 812                                                                                         $info_entry[$subelement['id_name']][] = getid3_lib::trimNullByte($subelement['data']);
 813                                                                                         break;
 814
 815                                                                                 case EBML_ID_SEGMENTFILENAME:
 816                                                                                 case EBML_ID_PREVFILENAME:
 817                                                                                 case EBML_ID_NEXTFILENAME:
 818                                                                                 case EBML_ID_TITLE:
 819                                                                                 case EBML_ID_MUXINGAPP:
 820                                                                                 case EBML_ID_WRITINGAPP:
 821                                                                                         $info_entry[$subelement['id_name']] = getid3_lib::trimNullByte($subelement['data']);
 822                                                                                         $info['matroska']['comments'][strtolower($subelement['id_name'])][] = $info_entry[$subelement['id_name']];
 823                                                                                         break;
 824
 825                                                                                 case EBML_ID_CHAPTERTRANSLATE:
 826                                                                                         $chaptertranslate_entry = array();
 827
 828                                                                                         while ($this->getEBMLelement($sub_subelement, $subelement['end'], true)) {
 829                                                                                                 switch ($sub_subelement['id']) {
 830
 831                                                                                                         case EBML_ID_CHAPTERTRANSLATEEDITIONUID:
 832                                                                                                                 $chaptertranslate_entry[$sub_subelement['id_name']][] = getid3_lib::BigEndian2Int($sub_subelement['data']);
 833                                                                                                                 break;
 834
 835                                                                                                         case EBML_ID_CHAPTERTRANSLATECODEC:
 836                                                                                                                 $chaptertranslate_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
 837                                                                                                                 break;
 838
 839                                                                                                         case EBML_ID_CHAPTERTRANSLATEID:
 840                                                                                                                 $chaptertranslate_entry[$sub_subelement['id_name']] = getid3_lib::trimNullByte($sub_subelement['data']);
 841                                                                                                                 break;
 842
 843                                                                                                         default:
 844                                                                                                                 $this->unhandledElement('info.chaptertranslate', __LINE__, $sub_subelement);
 845                                                                                                                 break;
 846                                                                                                 }
 847                                                                                         }
 848                                                                                         $info_entry[$subelement['id_name']] = $chaptertranslate_entry;
 849                                                                                         break;
 850
 851                                                                                 default:
 852                                                                                         $this->unhandledElement('info', __LINE__, $subelement);
 853                                                                                         break;
 854                                                                         }
 855                                                                 }
 856                                                                 $info['matroska']['info'][] = $info_entry;
 857                                                                 break;
 858
 859                                                         case EBML_ID_CUES: // A top-level element to speed seeking access. All entries are local to the segment. Should be mandatory for non "live" streams.
 860                                                                 if (self::$hide_clusters) { // do not parse cues if hide clusters is "ON" till they point to clusters anyway
 861                                                                         $this->current_offset = $element_data['end'];
 862                                                                         break;
 863                                                                 }
 864                                                                 $cues_entry = array();
 865
 866                                                                 while ($this->getEBMLelement($subelement, $element_data['end'])) {
 867                                                                         switch ($subelement['id']) {
 868
 869                                                                                 case EBML_ID_CUEPOINT:
 870                                                                                         $cuepoint_entry = array();
 871
 872                                                                                         while ($this->getEBMLelement($sub_subelement, $subelement['end'], array(EBML_ID_CUETRACKPOSITIONS))) {
 873                                                                                                 switch ($sub_subelement['id']) {
 874
 875                                                                                                         case EBML_ID_CUETRACKPOSITIONS:
 876                                                                                                                 $cuetrackpositions_entry = array();
 877
 878                                                                                                                 while ($this->getEBMLelement($sub_sub_subelement, $sub_subelement['end'], true)) {
 879                                                                                                                         switch ($sub_sub_subelement['id']) {
 880
 881                                                                                                                                 case EBML_ID_CUETRACK:
 882                                                                                                                                 case EBML_ID_CUECLUSTERPOSITION:
 883                                                                                                                                 case EBML_ID_CUEBLOCKNUMBER:
 884                                                                                                                                 case EBML_ID_CUECODECSTATE:
 885                                                                                                                                         $cuetrackpositions_entry[$sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
 886                                                                                                                                         break;
 887
 888                                                                                                                                 default:
 889                                                                                                                                         $this->unhandledElement('cues.cuepoint.cuetrackpositions', __LINE__, $sub_sub_subelement);
 890                                                                                                                                         break;
 891                                                                                                                         }
 892                                                                                                                 }
 893                                                                                                                 $cuepoint_entry[$sub_subelement['id_name']][] = $cuetrackpositions_entry;
 894                                                                                                                 break;
 895
 896                                                                                                         case EBML_ID_CUETIME:
 897                                                                                                                 $cuepoint_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
 898                                                                                                                 break;
 899
 900                                                                                                         default:
 901                                                                                                                 $this->unhandledElement('cues.cuepoint', __LINE__, $sub_subelement);
 902                                                                                                                 break;
 903                                                                                                 }
 904                                                                                         }
 905                                                                                         $cues_entry[] = $cuepoint_entry;
 906                                                                                         break;
 907
 908                                                                                 default:
 909                                                                                         $this->unhandledElement('cues', __LINE__, $subelement);
 910                                                                                         break;
 911                                                                         }
 912                                                                 }
 913                                                                 $info['matroska']['cues'] = $cues_entry;
 914                                                                 break;
 915
 916                                                         case EBML_ID_TAGS: // Element containing elements specific to Tracks/Chapters.
 917                                                                 $tags_entry = array();
 918
 919                                                                 while ($this->getEBMLelement($subelement, $element_data['end'], false)) {
 920                                                                         switch ($subelement['id']) {
 921
 922                                                                                 case EBML_ID_TAG:
 923                                                                                         $tag_entry = array();
 924
 925                                                                                         while ($this->getEBMLelement($sub_subelement, $subelement['end'], false)) {
 926                                                                                                 switch ($sub_subelement['id']) {
 927
 928                                                                                                         case EBML_ID_TARGETS:
 929                                                                                                                 $targets_entry = array();
 930
 931                                                                                                                 while ($this->getEBMLelement($sub_sub_subelement, $sub_subelement['end'], true)) {
 932                                                                                                                         switch ($sub_sub_subelement['id']) {
 933
 934                                                                                                                                 case EBML_ID_TARGETTYPEVALUE:
 935                                                                                                                                         $targets_entry[$sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
 936                                                                                                                                         $targets_entry[strtolower($sub_sub_subelement['id_name']).'_long'] = self::TargetTypeValue($targets_entry[$sub_sub_subelement['id_name']]);
 937                                                                                                                                         break;
 938
 939                                                                                                                                 case EBML_ID_TARGETTYPE:
 940                                                                                                                                         $targets_entry[$sub_sub_subelement['id_name']] = $sub_sub_subelement['data'];
 941                                                                                                                                         break;
 942
 943                                                                                                                                 case EBML_ID_TAGTRACKUID:
 944                                                                                                                                 case EBML_ID_TAGEDITIONUID:
 945                                                                                                                                 case EBML_ID_TAGCHAPTERUID:
 946                                                                                                                                 case EBML_ID_TAGATTACHMENTUID:
 947                                                                                                                                         $targets_entry[$sub_sub_subelement['id_name']][] = getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
 948                                                                                                                                         break;
 949
 950                                                                                                                                 default:
 951                                                                                                                                         $this->unhandledElement('tags.tag.targets', __LINE__, $sub_sub_subelement);
 952                                                                                                                                         break;
 953                                                                                                                         }
 954                                                                                                                 }
 955                                                                                                                 $tag_entry[$sub_subelement['id_name']] = $targets_entry;
 956                                                                                                                 break;
 957
 958                                                                                                         case EBML_ID_SIMPLETAG:
 959                                                                                                                 $tag_entry[$sub_subelement['id_name']][] = $this->HandleEMBLSimpleTag($sub_subelement['end']);
 960                                                                                                                 break;
 961
 962                                                                                                         default:
 963                                                                                                                 $this->unhandledElement('tags.tag', __LINE__, $sub_subelement);
 964                                                                                                                 break;
 965                                                                                                 }
 966                                                                                         }
 967                                                                                         $tags_entry[] = $tag_entry;
 968                                                                                         break;
 969
 970                                                                                 default:
 971                                                                                         $this->unhandledElement('tags', __LINE__, $subelement);
 972                                                                                         break;
 973                                                                         }
 974                                                                 }
 975                                                                 $info['matroska']['tags'] = $tags_entry;
 976                                                                 break;
 977
 978                                                         case EBML_ID_ATTACHMENTS: // Contain attached files.
 979
 980                                                                 while ($this->getEBMLelement($subelement, $element_data['end'])) {
 981                                                                         switch ($subelement['id']) {
 982
 983                                                                                 case EBML_ID_ATTACHEDFILE:
 984                                                                                         $attachedfile_entry = array();
 985
 986                                                                                         while ($this->getEBMLelement($sub_subelement, $subelement['end'], array(EBML_ID_FILEDATA))) {
 987                                                                                                 switch ($sub_subelement['id']) {
 988
 989                                                                                                         case EBML_ID_FILEDESCRIPTION:
 990                                                                                                         case EBML_ID_FILENAME:
 991                                                                                                         case EBML_ID_FILEMIMETYPE:
 992                                                                                                                 $attachedfile_entry[$sub_subelement['id_name']] = $sub_subelement['data'];
 993                                                                                                                 break;
 994
 995                                                                                                         case EBML_ID_FILEDATA:
 996                                                                                                                 $attachedfile_entry['data_offset'] = $this->current_offset;
 997                                                                                                                 $attachedfile_entry['data_length'] = $sub_subelement['length'];
 998
 999                                                                                                                 $attachedfile_entry[$sub_subelement['id_name']] = $this->saveAttachment(
1000                                                                                                                         $attachedfile_entry['FileName'],
1001                                                                                                                         $attachedfile_entry['data_offset'],
1002                                                                                                                         $attachedfile_entry['data_length']);
1003
1004                                                                                                                 $this->current_offset = $sub_subelement['end'];
1005                                                                                                                 break;
1006
1007                                                                                                         case EBML_ID_FILEUID:
1008                                                                                                                 $attachedfile_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
1009                                                                                                                 break;
1010
1011                                                                                                         default:
1012                                                                                                                 $this->unhandledElement('attachments.attachedfile', __LINE__, $sub_subelement);
1013                                                                                                                 break;
1014                                                                                                 }
1015                                                                                         }
1016                                                                                         $info['matroska']['attachments'][] = $attachedfile_entry;
1017                                                                                         break;
1018
1019                                                                                 default:
1020                                                                                         $this->unhandledElement('attachments', __LINE__, $subelement);
1021                                                                                         break;
1022                                                                         }
1023                                                                 }
1024                                                                 break;
1025
1026                                                         case EBML_ID_CHAPTERS:
1027
1028                                                                 while ($this->getEBMLelement($subelement, $element_data['end'])) {
1029                                                                         switch ($subelement['id']) {
1030
1031                                                                                 case EBML_ID_EDITIONENTRY:
1032                                                                                         $editionentry_entry = array();
1033
1034                                                                                         while ($this->getEBMLelement($sub_subelement, $subelement['end'], array(EBML_ID_CHAPTERATOM))) {
1035                                                                                                 switch ($sub_subelement['id']) {
1036
1037                                                                                                         case EBML_ID_EDITIONUID:
1038                                                                                                                 $editionentry_entry[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
1039                                                                                                                 break;
1040
1041                                                                                                         case EBML_ID_EDITIONFLAGHIDDEN:
1042                                                                                                         case EBML_ID_EDITIONFLAGDEFAULT:
1043                                                                                                         case EBML_ID_EDITIONFLAGORDERED:
1044                                                                                                                 $editionentry_entry[$sub_subelement['id_name']] = (bool)getid3_lib::BigEndian2Int($sub_subelement['data']);
1045                                                                                                                 break;
1046
1047                                                                                                         case EBML_ID_CHAPTERATOM:
1048                                                                                                                 $chapteratom_entry = array();
1049
1050                                                                                                                 while ($this->getEBMLelement($sub_sub_subelement, $sub_subelement['end'], array(EBML_ID_CHAPTERTRACK, EBML_ID_CHAPTERDISPLAY))) {
1051                                                                                                                         switch ($sub_sub_subelement['id']) {
1052
1053                                                                                                                                 case EBML_ID_CHAPTERSEGMENTUID:
1054                                                                                                                                 case EBML_ID_CHAPTERSEGMENTEDITIONUID:
1055                                                                                                                                         $chapteratom_entry[$sub_sub_subelement['id_name']] = $sub_sub_subelement['data'];
1056                                                                                                                                         break;
1057
1058                                                                                                                                 case EBML_ID_CHAPTERFLAGENABLED:
1059                                                                                                                                 case EBML_ID_CHAPTERFLAGHIDDEN:
1060                                                                                                                                         $chapteratom_entry[$sub_sub_subelement['id_name']] = (bool)getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
1061                                                                                                                                         break;
1062
1063                                                                                                                                 case EBML_ID_CHAPTERUID:
1064                                                                                                                                 case EBML_ID_CHAPTERTIMESTART:
1065                                                                                                                                 case EBML_ID_CHAPTERTIMEEND:
1066                                                                                                                                         $chapteratom_entry[$sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_subelement['data']);
1067                                                                                                                                         break;
1068
1069                                                                                                                                 case EBML_ID_CHAPTERTRACK:
1070                                                                                                                                         $chaptertrack_entry = array();
1071
1072                                                                                                                                         while ($this->getEBMLelement($sub_sub_sub_subelement, $sub_sub_subelement['end'], true)) {
1073                                                                                                                                                 switch ($sub_sub_sub_subelement['id']) {
1074
1075                                                                                                                                                         case EBML_ID_CHAPTERTRACKNUMBER:
1076                                                                                                                                                                 $chaptertrack_entry[$sub_sub_sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_sub_sub_subelement['data']);
1077                                                                                                                                                                 break;
1078
1079                                                                                                                                                         default:
1080                                                                                                                                                                 $this->unhandledElement('chapters.editionentry.chapteratom.chaptertrack', __LINE__, $sub_sub_sub_subelement);
1081                                                                                                                                                                 break;
1082                                                                                                                                                 }
1083                                                                                                                                         }
1084                                                                                                                                         $chapteratom_entry[$sub_sub_subelement['id_name']][] = $chaptertrack_entry;
1085                                                                                                                                         break;
1086
1087                                                                                                                                 case EBML_ID_CHAPTERDISPLAY:
1088                                                                                                                                         $chapterdisplay_entry = array();
1089
1090                                                                                                                                         while ($this->getEBMLelement($sub_sub_sub_subelement, $sub_sub_subelement['end'], true)) {
1091                                                                                                                                                 switch ($sub_sub_sub_subelement['id']) {
1092
1093                                                                                                                                                         case EBML_ID_CHAPSTRING:
1094                                                                                                                                                         case EBML_ID_CHAPLANGUAGE:
1095                                                                                                                                                         case EBML_ID_CHAPCOUNTRY:
1096                                                                                                                                                                 $chapterdisplay_entry[$sub_sub_sub_subelement['id_name']] = $sub_sub_sub_subelement['data'];
1097                                                                                                                                                                 break;
1098
1099                                                                                                                                                         default:
1100                                                                                                                                                                 $this->unhandledElement('chapters.editionentry.chapteratom.chapterdisplay', __LINE__, $sub_sub_sub_subelement);
1101                                                                                                                                                                 break;
1102                                                                                                                                                 }
1103                                                                                                                                         }
1104                                                                                                                                         $chapteratom_entry[$sub_sub_subelement['id_name']][] = $chapterdisplay_entry;
1105                                                                                                                                         break;
1106
1107                                                                                                                                 default:
1108                                                                                                                                         $this->unhandledElement('chapters.editionentry.chapteratom', __LINE__, $sub_sub_subelement);
1109                                                                                                                                         break;
1110                                                                                                                         }
1111                                                                                                                 }
1112                                                                                                                 $editionentry_entry[$sub_subelement['id_name']][] = $chapteratom_entry;
1113                                                                                                                 break;
1114
1115                                                                                                         default:
1116                                                                                                                 $this->unhandledElement('chapters.editionentry', __LINE__, $sub_subelement);
1117                                                                                                                 break;
1118                                                                                                 }
1119                                                                                         }
1120                                                                                         $info['matroska']['chapters'][] = $editionentry_entry;
1121                                                                                         break;
1122
1123                                                                                 default:
1124                                                                                         $this->unhandledElement('chapters', __LINE__, $subelement);
1125                                                                                         break;
1126                                                                         }
1127                                                                 }
1128                                                                 break;
1129
1130                                                         case EBML_ID_CLUSTER: // The lower level element containing the (monolithic) Block structure.
1131                                                                 $cluster_entry = array();
1132
1133                                                                 while ($this->getEBMLelement($subelement, $element_data['end'], array(EBML_ID_CLUSTERSILENTTRACKS, EBML_ID_CLUSTERBLOCKGROUP, EBML_ID_CLUSTERSIMPLEBLOCK))) {
1134                                                                         switch ($subelement['id']) {
1135
1136                                                                                 case EBML_ID_CLUSTERTIMECODE:
1137                                                                                 case EBML_ID_CLUSTERPOSITION:
1138                                                                                 case EBML_ID_CLUSTERPREVSIZE:
1139                                                                                         $cluster_entry[$subelement['id_name']] = getid3_lib::BigEndian2Int($subelement['data']);
1140                                                                                         break;
1141
1142                                                                                 case EBML_ID_CLUSTERSILENTTRACKS:
1143                                                                                         $cluster_silent_tracks = array();
1144
1145                                                                                         while ($this->getEBMLelement($sub_subelement, $subelement['end'], true)) {
1146                                                                                                 switch ($sub_subelement['id']) {
1147
1148                                                                                                         case EBML_ID_CLUSTERSILENTTRACKNUMBER:
1149                                                                                                                 $cluster_silent_tracks[] = getid3_lib::BigEndian2Int($sub_subelement['data']);
1150                                                                                                                 break;
1151
1152                                                                                                         default:
1153                                                                                                                 $this->unhandledElement('cluster.silenttracks', __LINE__, $sub_subelement);
1154                                                                                                                 break;
1155                                                                                                 }
1156                                                                                         }
1157                                                                                         $cluster_entry[$subelement['id_name']][] = $cluster_silent_tracks;
1158                                                                                         break;
1159
1160                                                                                 case EBML_ID_CLUSTERBLOCKGROUP:
1161                                                                                         $cluster_block_group = array('offset' => $this->current_offset);
1162
1163                                                                                         while ($this->getEBMLelement($sub_subelement, $subelement['end'], array(EBML_ID_CLUSTERBLOCK))) {
1164                                                                                                 switch ($sub_subelement['id']) {
1165
1166                                                                                                         case EBML_ID_CLUSTERBLOCK:
1167                                                                                                                 $cluster_block_group[$sub_subelement['id_name']] = $this->HandleEMBLClusterBlock($sub_subelement, EBML_ID_CLUSTERBLOCK, $info);
1168                                                                                                                 break;
1169
1170                                                                                                         case EBML_ID_CLUSTERREFERENCEPRIORITY: // unsigned-int
1171                                                                                                         case EBML_ID_CLUSTERBLOCKDURATION:     // unsigned-int
1172                                                                                                                 $cluster_block_group[$sub_subelement['id_name']] = getid3_lib::BigEndian2Int($sub_subelement['data']);
1173                                                                                                                 break;
1174
1175                                                                                                         case EBML_ID_CLUSTERREFERENCEBLOCK:    // signed-int
1176                                                                                                                 $cluster_block_group[$sub_subelement['id_name']][] = getid3_lib::BigEndian2Int($sub_subelement['data'], false, true);
1177                                                                                                                 break;
1178
1179                                                                                                         case EBML_ID_CLUSTERCODECSTATE:
1180                                                                                                                 $cluster_block_group[$sub_subelement['id_name']] = getid3_lib::trimNullByte($sub_subelement['data']);
1181                                                                                                                 break;
1182
1183                                                                                                         default:
1184                                                                                                                 $this->unhandledElement('clusters.blockgroup', __LINE__, $sub_subelement);
1185                                                                                                                 break;
1186                                                                                                 }
1187                                                                                         }
1188                                                                                         $cluster_entry[$subelement['id_name']][] = $cluster_block_group;
1189                                                                                         break;
1190
1191                                                                                 case EBML_ID_CLUSTERSIMPLEBLOCK:
1192                                                                                         $cluster_entry[$subelement['id_name']][] = $this->HandleEMBLClusterBlock($subelement, EBML_ID_CLUSTERSIMPLEBLOCK, $info);
1193                                                                                         break;
1194
1195                                                                                 default:
1196                                                                                         $this->unhandledElement('cluster', __LINE__, $subelement);
1197                                                                                         break;
1198                                                                         }
1199                                                                         $this->current_offset = $subelement['end'];
1200                                                                 }
1201                                                                 if (!self::$hide_clusters) {
1202                                                                         $info['matroska']['cluster'][] = $cluster_entry;
1203                                                                 }
1204
1205                                                                 // check to see if all the data we need exists already, if so, break out of the loop
1206                                                                 if (!self::$parse_whole_file) {
1207                                                                         if (isset($info['matroska']['info']) && is_array($info['matroska']['info'])) {
1208                                                                                 if (isset($info['matroska']['tracks']['tracks']) && is_array($info['matroska']['tracks']['tracks'])) {
1209                                                                                         if (count($info['matroska']['track_data_offsets']) == count($info['matroska']['tracks']['tracks'])) {
1210                                                                                                 return;
1211                                                                                         }
1212                                                                                 }
1213                                                                         }
1214                                                                 }
1215                                                                 break;
1216
1217                                                         default:
1218                                                                 $this->unhandledElement('segment', __LINE__, $element_data);
1219                                                                 break;
1220                                                 }
1221                                         }
1222                                         break;
1223
1224                                 default:
1225                                         $this->unhandledElement('root', __LINE__, $top_element);
1226                                         break;
1227                         }
1228                 }
1229         }
1230
1231         private function EnsureBufferHasEnoughData($min_data=1024) {
1232                 if (($this->current_offset - $this->EBMLbuffer_offset) >= ($this->EBMLbuffer_length - $min_data)) {
1233                         $read_bytes = max($min_data, $this->getid3->fread_buffer_size());
1234
1235                         try {
1236                                 $this->fseek($this->current_offset);
1237                                 $this->EBMLbuffer_offset = $this->current_offset;
1238                                 $this->EBMLbuffer        = $this->fread($read_bytes);
1239                                 $this->EBMLbuffer_length = strlen($this->EBMLbuffer);
1240                         } catch (getid3_exception $e) {
1241                                 $this->warning('EBML parser: '.$e->getMessage());
1242                                 return false;
1243                         }
1244
1245                         if ($this->EBMLbuffer_length == 0 && $this->feof()) {
1246                                 return $this->error('EBML parser: ran out of file at offset '.$this->current_offset);
1247                         }
1248                 }
1249                 return true;
1250         }
1251
1252         private function readEBMLint() {
1253                 $actual_offset = $this->current_offset - $this->EBMLbuffer_offset;
1254
1255                 // get length of integer
1256                 $first_byte_int = ord($this->EBMLbuffer[$actual_offset]);
1257                 if       (0x80 & $first_byte_int) {
1258                         $length = 1;
1259                 } elseif (0x40 & $first_byte_int) {
1260                         $length = 2;
1261                 } elseif (0x20 & $first_byte_int) {
1262                         $length = 3;
1263                 } elseif (0x10 & $first_byte_int) {
1264                         $length = 4;
1265                 } elseif (0x08 & $first_byte_int) {
1266                         $length = 5;
1267                 } elseif (0x04 & $first_byte_int) {
1268                         $length = 6;
1269                 } elseif (0x02 & $first_byte_int) {
1270                         $length = 7;
1271                 } elseif (0x01 & $first_byte_int) {
1272                         $length = 8;
1273                 } else {
1274                         throw new Exception('invalid EBML integer (leading 0x00) at '.$this->current_offset);
1275                 }
1276
1277                 // read
1278                 $int_value = self::EBML2Int(substr($this->EBMLbuffer, $actual_offset, $length));
1279                 $this->current_offset += $length;
1280
1281                 return $int_value;
1282         }
1283
1284         private function readEBMLelementData($length, $check_buffer=false) {
1285                 if ($check_buffer && !$this->EnsureBufferHasEnoughData($length)) {
1286                         return false;
1287                 }
1288                 $data = substr($this->EBMLbuffer, $this->current_offset - $this->EBMLbuffer_offset, $length);
1289                 $this->current_offset += $length;
1290                 return $data;
1291         }
1292
1293         private function getEBMLelement(&$element, $parent_end, $get_data=false) {
1294                 if ($this->current_offset >= $parent_end) {
1295                         return false;
1296                 }
1297
1298                 if (!$this->EnsureBufferHasEnoughData()) {
1299                         $this->current_offset = PHP_INT_MAX; // do not exit parser right now, allow to finish current loop to gather maximum information
1300                         return false;
1301                 }
1302
1303                 $element = array();
1304
1305                 // set offset
1306                 $element['offset'] = $this->current_offset;
1307
1308                 // get ID
1309                 $element['id'] = $this->readEBMLint();
1310
1311                 // get name
1312                 $element['id_name'] = self::EBMLidName($element['id']);
1313
1314                 // get length
1315                 $element['length'] = $this->readEBMLint();
1316
1317                 // get end offset
1318                 $element['end'] = $this->current_offset + $element['length'];
1319
1320                 // get raw data
1321                 $dont_parse = (in_array($element['id'], $this->unuseful_elements) || $element['id_name'] == dechex($element['id']));
1322                 if (($get_data === true || (is_array($get_data) && !in_array($element['id'], $get_data))) && !$dont_parse) {
1323                         $element['data'] = $this->readEBMLelementData($element['length'], $element);
1324                 }
1325
1326                 return true;
1327         }
1328
1329         private function unhandledElement($type, $line, $element) {
1330                 // warn only about unknown and missed elements, not about unuseful
1331                 if (!in_array($element['id'], $this->unuseful_elements)) {
1332                         $this->warning('Unhandled '.$type.' element ['.basename(__FILE__).':'.$line.'] ('.$element['id'].'::'.$element['id_name'].' ['.$element['length'].' bytes]) at '.$element['offset']);
1333                 }
1334
1335                 // increase offset for unparsed elements
1336                 if (!isset($element['data'])) {
1337                         $this->current_offset = $element['end'];
1338                 }
1339         }
1340
1341         private function ExtractCommentsSimpleTag($SimpleTagArray) {
1342                 if (!empty($SimpleTagArray['SimpleTag'])) {
1343                         foreach ($SimpleTagArray['SimpleTag'] as $SimpleTagKey => $SimpleTagData) {
1344                                 if (!empty($SimpleTagData['TagName']) && !empty($SimpleTagData['TagString'])) {
1345                                         $this->getid3->info['matroska']['comments'][strtolower($SimpleTagData['TagName'])][] = $SimpleTagData['TagString'];
1346                                 }
1347                                 if (!empty($SimpleTagData['SimpleTag'])) {
1348                                         $this->ExtractCommentsSimpleTag($SimpleTagData);
1349                                 }
1350                         }
1351                 }
1352
1353                 return true;
1354         }
1355
1356         private function HandleEMBLSimpleTag($parent_end) {
1357                 $simpletag_entry = array();
1358
1359                 while ($this->getEBMLelement($element, $parent_end, array(EBML_ID_SIMPLETAG))) {
1360                         switch ($element['id']) {
1361
1362                                 case EBML_ID_TAGNAME:
1363                                 case EBML_ID_TAGLANGUAGE:
1364                                 case EBML_ID_TAGSTRING:
1365                                 case EBML_ID_TAGBINARY:
1366                                         $simpletag_entry[$element['id_name']] = $element['data'];
1367                                         break;
1368
1369                                 case EBML_ID_SIMPLETAG:
1370                                         $simpletag_entry[$element['id_name']][] = $this->HandleEMBLSimpleTag($element['end']);
1371                                         break;
1372
1373                                 case EBML_ID_TAGDEFAULT:
1374                                         $simpletag_entry[$element['id_name']] = (bool)getid3_lib::BigEndian2Int($element['data']);
1375                                         break;
1376
1377                                 default:
1378                                         $this->unhandledElement('tag.simpletag', __LINE__, $element);
1379                                         break;
1380                         }
1381                 }
1382
1383                 return $simpletag_entry;
1384         }
1385
1386         private function HandleEMBLClusterBlock($element, $block_type, &$info) {
1387                 // http://www.matroska.org/technical/specs/index.html#block_structure
1388                 // http://www.matroska.org/technical/specs/index.html#simpleblock_structure
1389
1390                 $block_data = array();
1391                 $block_data['tracknumber'] = $this->readEBMLint();
1392                 $block_data['timecode']    = getid3_lib::BigEndian2Int($this->readEBMLelementData(2), false, true);
1393                 $block_data['flags_raw']   = getid3_lib::BigEndian2Int($this->readEBMLelementData(1));
1394
1395                 if ($block_type == EBML_ID_CLUSTERSIMPLEBLOCK) {
1396                         $block_data['flags']['keyframe']  = (($block_data['flags_raw'] & 0x80) >> 7);
1397                         //$block_data['flags']['reserved1'] = (($block_data['flags_raw'] & 0x70) >> 4);
1398                 }
1399                 else {
1400                         //$block_data['flags']['reserved1'] = (($block_data['flags_raw'] & 0xF0) >> 4);
1401                 }
1402                 $block_data['flags']['invisible'] = (bool)(($block_data['flags_raw'] & 0x08) >> 3);
1403                 $block_data['flags']['lacing']    =       (($block_data['flags_raw'] & 0x06) >> 1);  // 00=no lacing; 01=Xiph lacing; 11=EBML lacing; 10=fixed-size lacing
1404                 if ($block_type == EBML_ID_CLUSTERSIMPLEBLOCK) {
1405                         $block_data['flags']['discardable'] = (($block_data['flags_raw'] & 0x01));
1406                 }
1407                 else {
1408                         //$block_data['flags']['reserved2'] = (($block_data['flags_raw'] & 0x01) >> 0);
1409                 }
1410                 $block_data['flags']['lacing_type'] = self::BlockLacingType($block_data['flags']['lacing']);
1411
1412                 // Lace (when lacing bit is set)
1413                 if ($block_data['flags']['lacing'] > 0) {
1414                         $block_data['lace_frames'] = getid3_lib::BigEndian2Int($this->readEBMLelementData(1)) + 1; // Number of frames in the lace-1 (uint8)
1415                         if ($block_data['flags']['lacing'] != 0x02) {
1416                                 for ($i = 1; $i < $block_data['lace_frames']; $i ++) { // Lace-coded size of each frame of the lace, except for the last one (multiple uint8). *This is not used with Fixed-size lacing as it is calculated automatically from (total size of lace) / (number of frames in lace).
1417                                         if ($block_data['flags']['lacing'] == 0x03) { // EBML lacing
1418                                                 $block_data['lace_frames_size'][$i] = $this->readEBMLint(); // TODO: read size correctly, calc size for the last frame. For now offsets are deteminded OK with readEBMLint() and that's the most important thing.
1419                                         }
1420                                         else { // Xiph lacing
1421                                                 $block_data['lace_frames_size'][$i] = 0;
1422                                                 do {
1423                                                         $size = getid3_lib::BigEndian2Int($this->readEBMLelementData(1));
1424                                                         $block_data['lace_frames_size'][$i] += $size;
1425                                                 }
1426                                                 while ($size == 255);
1427                                         }
1428                                 }
1429                                 if ($block_data['flags']['lacing'] == 0x01) { // calc size of the last frame only for Xiph lacing, till EBML sizes are now anyway determined incorrectly
1430                                         $block_data['lace_frames_size'][] = $element['end'] - $this->current_offset - array_sum($block_data['lace_frames_size']);
1431                                 }
1432                         }
1433                 }
1434
1435                 if (!isset($info['matroska']['track_data_offsets'][$block_data['tracknumber']])) {
1436                         $info['matroska']['track_data_offsets'][$block_data['tracknumber']]['offset'] = $this->current_offset;
1437                         $info['matroska']['track_data_offsets'][$block_data['tracknumber']]['length'] = $element['end'] - $this->current_offset;
1438                         //$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['total_length'] = 0;
1439                 }
1440                 //$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['total_length'] += $info['matroska']['track_data_offsets'][$block_data['tracknumber']]['length'];
1441                 //$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['duration']      = $block_data['timecode'] * ((isset($info['matroska']['info'][0]['TimecodeScale']) ? $info['matroska']['info'][0]['TimecodeScale'] : 1000000) / 1000000000);
1442
1443                 // set offset manually
1444                 $this->current_offset = $element['end'];
1445
1446                 return $block_data;
1447         }
1448
1449         private static function EBML2Int($EBMLstring) {
1450                 // http://matroska.org/specs/
1451
1452                 // Element ID coded with an UTF-8 like system:
1453                 // 1xxx xxxx                                  - Class A IDs (2^7 -2 possible values) (base 0x8X)
1454                 // 01xx xxxx  xxxx xxxx                       - Class B IDs (2^14-2 possible values) (base 0x4X 0xXX)
1455                 // 001x xxxx  xxxx xxxx  xxxx xxxx            - Class C IDs (2^21-2 possible values) (base 0x2X 0xXX 0xXX)
1456                 // 0001 xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx - Class D IDs (2^28-2 possible values) (base 0x1X 0xXX 0xXX 0xXX)
1457                 // Values with all x at 0 and 1 are reserved (hence the -2).
1458
1459                 // Data size, in octets, is also coded with an UTF-8 like system :
1460                 // 1xxx xxxx                                                                              - value 0 to  2^7-2
1461                 // 01xx xxxx  xxxx xxxx                                                                   - value 0 to 2^14-2
1462                 // 001x xxxx  xxxx xxxx  xxxx xxxx                                                        - value 0 to 2^21-2
1463                 // 0001 xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx                                             - value 0 to 2^28-2
1464                 // 0000 1xxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx                                  - value 0 to 2^35-2
1465                 // 0000 01xx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx                       - value 0 to 2^42-2
1466                 // 0000 001x  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx            - value 0 to 2^49-2
1467                 // 0000 0001  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx  xxxx xxxx - value 0 to 2^56-2
1468
1469                 $first_byte_int = ord($EBMLstring[0]);
1470                 if (0x80 & $first_byte_int) {
1471                         $EBMLstring[0] = chr($first_byte_int & 0x7F);
1472                 } elseif (0x40 & $first_byte_int) {
1473                         $EBMLstring[0] = chr($first_byte_int & 0x3F);
1474                 } elseif (0x20 & $first_byte_int) {
1475                         $EBMLstring[0] = chr($first_byte_int & 0x1F);
1476                 } elseif (0x10 & $first_byte_int) {
1477                         $EBMLstring[0] = chr($first_byte_int & 0x0F);
1478                 } elseif (0x08 & $first_byte_int) {
1479                         $EBMLstring[0] = chr($first_byte_int & 0x07);
1480                 } elseif (0x04 & $first_byte_int) {
1481                         $EBMLstring[0] = chr($first_byte_int & 0x03);
1482                 } elseif (0x02 & $first_byte_int) {
1483                         $EBMLstring[0] = chr($first_byte_int & 0x01);
1484                 } elseif (0x01 & $first_byte_int) {
1485                         $EBMLstring[0] = chr($first_byte_int & 0x00);
1486                 }
1487
1488                 return getid3_lib::BigEndian2Int($EBMLstring);
1489         }
1490
1491         private static function EBMLdate2unix($EBMLdatestamp) {
1492                 // Date - signed 8 octets integer in nanoseconds with 0 indicating the precise beginning of the millennium (at 2001-01-01T00:00:00,000000000 UTC)
1493                 // 978307200 == mktime(0, 0, 0, 1, 1, 2001) == January 1, 2001 12:00:00am UTC
1494                 return round(($EBMLdatestamp / 1000000000) + 978307200);
1495         }
1496
1497         public static function TargetTypeValue($target_type) {
1498                 // http://www.matroska.org/technical/specs/tagging/index.html
1499                 static $TargetTypeValue = array();
1500                 if (empty($TargetTypeValue)) {
1501                         $TargetTypeValue[10] = 'A: ~ V:shot';                                           // the lowest hierarchy found in music or movies
1502                         $TargetTypeValue[20] = 'A:subtrack/part/movement ~ V:scene';                    // corresponds to parts of a track for audio (like a movement)
1503                         $TargetTypeValue[30] = 'A:track/song ~ V:chapter';                              // the common parts of an album or a movie
1504                         $TargetTypeValue[40] = 'A:part/session ~ V:part/session';                       // when an album or episode has different logical parts
1505                         $TargetTypeValue[50] = 'A:album/opera/concert ~ V:movie/episode/concert';       // the most common grouping level of music and video (equals to an episode for TV series)
1506                         $TargetTypeValue[60] = 'A:edition/issue/volume/opus ~ V:season/sequel/volume';  // a list of lower levels grouped together
1507                         $TargetTypeValue[70] = 'A:collection ~ V:collection';                           // the high hierarchy consisting of many different lower items
1508                 }
1509                 return (isset($TargetTypeValue[$target_type]) ? $TargetTypeValue[$target_type] : $target_type);
1510         }
1511
1512         public static function BlockLacingType($lacingtype) {
1513                 // http://matroska.org/technical/specs/index.html#block_structure
1514                 static $BlockLacingType = array();
1515                 if (empty($BlockLacingType)) {
1516                         $BlockLacingType[0x00] = 'no lacing';
1517                         $BlockLacingType[0x01] = 'Xiph lacing';
1518                         $BlockLacingType[0x02] = 'fixed-size lacing';
1519                         $BlockLacingType[0x03] = 'EBML lacing';
1520                 }
1521                 return (isset($BlockLacingType[$lacingtype]) ? $BlockLacingType[$lacingtype] : $lacingtype);
1522         }
1523
1524         public static function CodecIDtoCommonName($codecid) {
1525                 // http://www.matroska.org/technical/specs/codecid/index.html
1526                 static $CodecIDlist = array();
1527                 if (empty($CodecIDlist)) {
1528                         $CodecIDlist['A_AAC']            = 'aac';
1529                         $CodecIDlist['A_AAC/MPEG2/LC']   = 'aac';
1530                         $CodecIDlist['A_AC3']            = 'ac3';
1531                         $CodecIDlist['A_EAC3']           = 'eac3';
1532                         $CodecIDlist['A_DTS']            = 'dts';
1533                         $CodecIDlist['A_FLAC']           = 'flac';
1534                         $CodecIDlist['A_MPEG/L1']        = 'mp1';
1535                         $CodecIDlist['A_MPEG/L2']        = 'mp2';
1536                         $CodecIDlist['A_MPEG/L3']        = 'mp3';
1537                         $CodecIDlist['A_PCM/INT/LIT']    = 'pcm';       // PCM Integer Little Endian
1538                         $CodecIDlist['A_PCM/INT/BIG']    = 'pcm';       // PCM Integer Big Endian
1539                         $CodecIDlist['A_QUICKTIME/QDMC'] = 'quicktime'; // Quicktime: QDesign Music
1540                         $CodecIDlist['A_QUICKTIME/QDM2'] = 'quicktime'; // Quicktime: QDesign Music v2
1541                         $CodecIDlist['A_VORBIS']         = 'vorbis';
1542                         $CodecIDlist['V_MPEG1']          = 'mpeg';
1543                         $CodecIDlist['V_THEORA']         = 'theora';
1544                         $CodecIDlist['V_REAL/RV40']      = 'real';
1545                         $CodecIDlist['V_REAL/RV10']      = 'real';
1546                         $CodecIDlist['V_REAL/RV20']      = 'real';
1547                         $CodecIDlist['V_REAL/RV30']      = 'real';
1548                         $CodecIDlist['V_QUICKTIME']      = 'quicktime'; // Quicktime
1549                         $CodecIDlist['V_MPEG4/ISO/AP']   = 'mpeg4';
1550                         $CodecIDlist['V_MPEG4/ISO/ASP']  = 'mpeg4';
1551                         $CodecIDlist['V_MPEG4/ISO/AVC']  = 'h264';
1552                         $CodecIDlist['V_MPEG4/ISO/SP']   = 'mpeg4';
1553                         $CodecIDlist['V_VP8']            = 'vp8';
1554                         $CodecIDlist['V_MS/VFW/FOURCC']  = 'vcm'; // Microsoft (TM) Video Codec Manager (VCM)
1555                         $CodecIDlist['A_MS/ACM']         = 'acm'; // Microsoft (TM) Audio Codec Manager (ACM)
1556                 }
1557                 return (isset($CodecIDlist[$codecid]) ? $CodecIDlist[$codecid] : $codecid);
1558         }
1559
1560         private static function EBMLidName($value) {
1561                 static $EBMLidList = array();
1562                 if (empty($EBMLidList)) {
1563                         $EBMLidList[EBML_ID_ASPECTRATIOTYPE]            = 'AspectRatioType';
1564                         $EBMLidList[EBML_ID_ATTACHEDFILE]               = 'AttachedFile';
1565                         $EBMLidList[EBML_ID_ATTACHMENTLINK]             = 'AttachmentLink';
1566                         $EBMLidList[EBML_ID_ATTACHMENTS]                = 'Attachments';
1567                         $EBMLidList[EBML_ID_AUDIO]                      = 'Audio';
1568                         $EBMLidList[EBML_ID_BITDEPTH]                   = 'BitDepth';
1569                         $EBMLidList[EBML_ID_CHANNELPOSITIONS]           = 'ChannelPositions';
1570                         $EBMLidList[EBML_ID_CHANNELS]                   = 'Channels';
1571                         $EBMLidList[EBML_ID_CHAPCOUNTRY]                = 'ChapCountry';
1572                         $EBMLidList[EBML_ID_CHAPLANGUAGE]               = 'ChapLanguage';
1573                         $EBMLidList[EBML_ID_CHAPPROCESS]                = 'ChapProcess';
1574                         $EBMLidList[EBML_ID_CHAPPROCESSCODECID]         = 'ChapProcessCodecID';
1575                         $EBMLidList[EBML_ID_CHAPPROCESSCOMMAND]         = 'ChapProcessCommand';
1576                         $EBMLidList[EBML_ID_CHAPPROCESSDATA]            = 'ChapProcessData';
1577                         $EBMLidList[EBML_ID_CHAPPROCESSPRIVATE]         = 'ChapProcessPrivate';
1578                         $EBMLidList[EBML_ID_CHAPPROCESSTIME]            = 'ChapProcessTime';
1579                         $EBMLidList[EBML_ID_CHAPSTRING]                 = 'ChapString';
1580                         $EBMLidList[EBML_ID_CHAPTERATOM]                = 'ChapterAtom';
1581                         $EBMLidList[EBML_ID_CHAPTERDISPLAY]             = 'ChapterDisplay';
1582                         $EBMLidList[EBML_ID_CHAPTERFLAGENABLED]         = 'ChapterFlagEnabled';
1583                         $EBMLidList[EBML_ID_CHAPTERFLAGHIDDEN]          = 'ChapterFlagHidden';
1584                         $EBMLidList[EBML_ID_CHAPTERPHYSICALEQUIV]       = 'ChapterPhysicalEquiv';
1585                         $EBMLidList[EBML_ID_CHAPTERS]                   = 'Chapters';
1586                         $EBMLidList[EBML_ID_CHAPTERSEGMENTEDITIONUID]   = 'ChapterSegmentEditionUID';
1587                         $EBMLidList[EBML_ID_CHAPTERSEGMENTUID]          = 'ChapterSegmentUID';
1588                         $EBMLidList[EBML_ID_CHAPTERTIMEEND]             = 'ChapterTimeEnd';
1589                         $EBMLidList[EBML_ID_CHAPTERTIMESTART]           = 'ChapterTimeStart';
1590                         $EBMLidList[EBML_ID_CHAPTERTRACK]               = 'ChapterTrack';
1591                         $EBMLidList[EBML_ID_CHAPTERTRACKNUMBER]         = 'ChapterTrackNumber';
1592                         $EBMLidList[EBML_ID_CHAPTERTRANSLATE]           = 'ChapterTranslate';
1593                         $EBMLidList[EBML_ID_CHAPTERTRANSLATECODEC]      = 'ChapterTranslateCodec';
1594                         $EBMLidList[EBML_ID_CHAPTERTRANSLATEEDITIONUID] = 'ChapterTranslateEditionUID';
1595                         $EBMLidList[EBML_ID_CHAPTERTRANSLATEID]         = 'ChapterTranslateID';
1596                         $EBMLidList[EBML_ID_CHAPTERUID]                 = 'ChapterUID';
1597                         $EBMLidList[EBML_ID_CLUSTER]                    = 'Cluster';
1598                         $EBMLidList[EBML_ID_CLUSTERBLOCK]               = 'ClusterBlock';
1599                         $EBMLidList[EBML_ID_CLUSTERBLOCKADDID]          = 'ClusterBlockAddID';
1600                         $EBMLidList[EBML_ID_CLUSTERBLOCKADDITIONAL]     = 'ClusterBlockAdditional';
1601                         $EBMLidList[EBML_ID_CLUSTERBLOCKADDITIONID]     = 'ClusterBlockAdditionID';
1602                         $EBMLidList[EBML_ID_CLUSTERBLOCKADDITIONS]      = 'ClusterBlockAdditions';
1603                         $EBMLidList[EBML_ID_CLUSTERBLOCKDURATION]       = 'ClusterBlockDuration';
1604                         $EBMLidList[EBML_ID_CLUSTERBLOCKGROUP]          = 'ClusterBlockGroup';
1605                         $EBMLidList[EBML_ID_CLUSTERBLOCKMORE]           = 'ClusterBlockMore';
1606                         $EBMLidList[EBML_ID_CLUSTERBLOCKVIRTUAL]        = 'ClusterBlockVirtual';
1607                         $EBMLidList[EBML_ID_CLUSTERCODECSTATE]          = 'ClusterCodecState';
1608                         $EBMLidList[EBML_ID_CLUSTERDELAY]               = 'ClusterDelay';
1609                         $EBMLidList[EBML_ID_CLUSTERDURATION]            = 'ClusterDuration';
1610                         $EBMLidList[EBML_ID_CLUSTERENCRYPTEDBLOCK]      = 'ClusterEncryptedBlock';
1611                         $EBMLidList[EBML_ID_CLUSTERFRAMENUMBER]         = 'ClusterFrameNumber';
1612                         $EBMLidList[EBML_ID_CLUSTERLACENUMBER]          = 'ClusterLaceNumber';
1613                         $EBMLidList[EBML_ID_CLUSTERPOSITION]            = 'ClusterPosition';
1614                         $EBMLidList[EBML_ID_CLUSTERPREVSIZE]            = 'ClusterPrevSize';
1615                         $EBMLidList[EBML_ID_CLUSTERREFERENCEBLOCK]      = 'ClusterReferenceBlock';
1616                         $EBMLidList[EBML_ID_CLUSTERREFERENCEPRIORITY]   = 'ClusterReferencePriority';
1617                         $EBMLidList[EBML_ID_CLUSTERREFERENCEVIRTUAL]    = 'ClusterReferenceVirtual';
1618                         $EBMLidList[EBML_ID_CLUSTERSILENTTRACKNUMBER]   = 'ClusterSilentTrackNumber';
1619                         $EBMLidList[EBML_ID_CLUSTERSILENTTRACKS]        = 'ClusterSilentTracks';
1620                         $EBMLidList[EBML_ID_CLUSTERSIMPLEBLOCK]         = 'ClusterSimpleBlock';
1621                         $EBMLidList[EBML_ID_CLUSTERTIMECODE]            = 'ClusterTimecode';
1622                         $EBMLidList[EBML_ID_CLUSTERTIMESLICE]           = 'ClusterTimeSlice';
1623                         $EBMLidList[EBML_ID_CODECDECODEALL]             = 'CodecDecodeAll';
1624                         $EBMLidList[EBML_ID_CODECDOWNLOADURL]           = 'CodecDownloadURL';
1625                         $EBMLidList[EBML_ID_CODECID]                    = 'CodecID';
1626                         $EBMLidList[EBML_ID_CODECINFOURL]               = 'CodecInfoURL';
1627                         $EBMLidList[EBML_ID_CODECNAME]                  = 'CodecName';
1628                         $EBMLidList[EBML_ID_CODECPRIVATE]               = 'CodecPrivate';
1629                         $EBMLidList[EBML_ID_CODECSETTINGS]              = 'CodecSettings';
1630                         $EBMLidList[EBML_ID_COLOURSPACE]                = 'ColourSpace';
1631                         $EBMLidList[EBML_ID_CONTENTCOMPALGO]            = 'ContentCompAlgo';
1632                         $EBMLidList[EBML_ID_CONTENTCOMPRESSION]         = 'ContentCompression';
1633                         $EBMLidList[EBML_ID_CONTENTCOMPSETTINGS]        = 'ContentCompSettings';
1634                         $EBMLidList[EBML_ID_CONTENTENCALGO]             = 'ContentEncAlgo';
1635                         $EBMLidList[EBML_ID_CONTENTENCKEYID]            = 'ContentEncKeyID';
1636                         $EBMLidList[EBML_ID_CONTENTENCODING]            = 'ContentEncoding';
1637                         $EBMLidList[EBML_ID_CONTENTENCODINGORDER]       = 'ContentEncodingOrder';
1638                         $EBMLidList[EBML_ID_CONTENTENCODINGS]           = 'ContentEncodings';
1639                         $EBMLidList[EBML_ID_CONTENTENCODINGSCOPE]       = 'ContentEncodingScope';
1640                         $EBMLidList[EBML_ID_CONTENTENCODINGTYPE]        = 'ContentEncodingType';
1641                         $EBMLidList[EBML_ID_CONTENTENCRYPTION]          = 'ContentEncryption';
1642                         $EBMLidList[EBML_ID_CONTENTSIGALGO]             = 'ContentSigAlgo';
1643                         $EBMLidList[EBML_ID_CONTENTSIGHASHALGO]         = 'ContentSigHashAlgo';
1644                         $EBMLidList[EBML_ID_CONTENTSIGKEYID]            = 'ContentSigKeyID';
1645                         $EBMLidList[EBML_ID_CONTENTSIGNATURE]           = 'ContentSignature';
1646                         $EBMLidList[EBML_ID_CRC32]                      = 'CRC32';
1647                         $EBMLidList[EBML_ID_CUEBLOCKNUMBER]             = 'CueBlockNumber';
1648                         $EBMLidList[EBML_ID_CUECLUSTERPOSITION]         = 'CueClusterPosition';
1649                         $EBMLidList[EBML_ID_CUECODECSTATE]              = 'CueCodecState';
1650                         $EBMLidList[EBML_ID_CUEPOINT]                   = 'CuePoint';
1651                         $EBMLidList[EBML_ID_CUEREFCLUSTER]              = 'CueRefCluster';
1652                         $EBMLidList[EBML_ID_CUEREFCODECSTATE]           = 'CueRefCodecState';
1653                         $EBMLidList[EBML_ID_CUEREFERENCE]               = 'CueReference';
1654                         $EBMLidList[EBML_ID_CUEREFNUMBER]               = 'CueRefNumber';
1655                         $EBMLidList[EBML_ID_CUEREFTIME]                 = 'CueRefTime';
1656                         $EBMLidList[EBML_ID_CUES]                       = 'Cues';
1657                         $EBMLidList[EBML_ID_CUETIME]                    = 'CueTime';
1658                         $EBMLidList[EBML_ID_CUETRACK]                   = 'CueTrack';
1659                         $EBMLidList[EBML_ID_CUETRACKPOSITIONS]          = 'CueTrackPositions';
1660                         $EBMLidList[EBML_ID_DATEUTC]                    = 'DateUTC';
1661                         $EBMLidList[EBML_ID_DEFAULTDURATION]            = 'DefaultDuration';
1662                         $EBMLidList[EBML_ID_DISPLAYHEIGHT]              = 'DisplayHeight';
1663                         $EBMLidList[EBML_ID_DISPLAYUNIT]                = 'DisplayUnit';
1664                         $EBMLidList[EBML_ID_DISPLAYWIDTH]               = 'DisplayWidth';
1665                         $EBMLidList[EBML_ID_DOCTYPE]                    = 'DocType';
1666                         $EBMLidList[EBML_ID_DOCTYPEREADVERSION]         = 'DocTypeReadVersion';
1667                         $EBMLidList[EBML_ID_DOCTYPEVERSION]             = 'DocTypeVersion';
1668                         $EBMLidList[EBML_ID_DURATION]                   = 'Duration';
1669                         $EBMLidList[EBML_ID_EBML]                       = 'EBML';
1670                         $EBMLidList[EBML_ID_EBMLMAXIDLENGTH]            = 'EBMLMaxIDLength';
1671                         $EBMLidList[EBML_ID_EBMLMAXSIZELENGTH]          = 'EBMLMaxSizeLength';
1672                         $EBMLidList[EBML_ID_EBMLREADVERSION]            = 'EBMLReadVersion';
1673                         $EBMLidList[EBML_ID_EBMLVERSION]                = 'EBMLVersion';
1674                         $EBMLidList[EBML_ID_EDITIONENTRY]               = 'EditionEntry';
1675                         $EBMLidList[EBML_ID_EDITIONFLAGDEFAULT]         = 'EditionFlagDefault';
1676                         $EBMLidList[EBML_ID_EDITIONFLAGHIDDEN]          = 'EditionFlagHidden';
1677                         $EBMLidList[EBML_ID_EDITIONFLAGORDERED]         = 'EditionFlagOrdered';
1678                         $EBMLidList[EBML_ID_EDITIONUID]                 = 'EditionUID';
1679                         $EBMLidList[EBML_ID_FILEDATA]                   = 'FileData';
1680                         $EBMLidList[EBML_ID_FILEDESCRIPTION]            = 'FileDescription';
1681                         $EBMLidList[EBML_ID_FILEMIMETYPE]               = 'FileMimeType';
1682                         $EBMLidList[EBML_ID_FILENAME]                   = 'FileName';
1683                         $EBMLidList[EBML_ID_FILEREFERRAL]               = 'FileReferral';
1684                         $EBMLidList[EBML_ID_FILEUID]                    = 'FileUID';
1685                         $EBMLidList[EBML_ID_FLAGDEFAULT]                = 'FlagDefault';
1686                         $EBMLidList[EBML_ID_FLAGENABLED]                = 'FlagEnabled';
1687                         $EBMLidList[EBML_ID_FLAGFORCED]                 = 'FlagForced';
1688                         $EBMLidList[EBML_ID_FLAGINTERLACED]             = 'FlagInterlaced';
1689                         $EBMLidList[EBML_ID_FLAGLACING]                 = 'FlagLacing';
1690                         $EBMLidList[EBML_ID_GAMMAVALUE]                 = 'GammaValue';
1691                         $EBMLidList[EBML_ID_INFO]                       = 'Info';
1692                         $EBMLidList[EBML_ID_LANGUAGE]                   = 'Language';
1693                         $EBMLidList[EBML_ID_MAXBLOCKADDITIONID]         = 'MaxBlockAdditionID';
1694                         $EBMLidList[EBML_ID_MAXCACHE]                   = 'MaxCache';
1695                         $EBMLidList[EBML_ID_MINCACHE]                   = 'MinCache';
1696                         $EBMLidList[EBML_ID_MUXINGAPP]                  = 'MuxingApp';
1697                         $EBMLidList[EBML_ID_NAME]                       = 'Name';
1698                         $EBMLidList[EBML_ID_NEXTFILENAME]               = 'NextFilename';
1699                         $EBMLidList[EBML_ID_NEXTUID]                    = 'NextUID';
1700                         $EBMLidList[EBML_ID_OUTPUTSAMPLINGFREQUENCY]    = 'OutputSamplingFrequency';
1701                         $EBMLidList[EBML_ID_PIXELCROPBOTTOM]            = 'PixelCropBottom';
1702                         $EBMLidList[EBML_ID_PIXELCROPLEFT]              = 'PixelCropLeft';
1703                         $EBMLidList[EBML_ID_PIXELCROPRIGHT]             = 'PixelCropRight';
1704                         $EBMLidList[EBML_ID_PIXELCROPTOP]               = 'PixelCropTop';
1705                         $EBMLidList[EBML_ID_PIXELHEIGHT]                = 'PixelHeight';
1706                         $EBMLidList[EBML_ID_PIXELWIDTH]                 = 'PixelWidth';
1707                         $EBMLidList[EBML_ID_PREVFILENAME]               = 'PrevFilename';
1708                         $EBMLidList[EBML_ID_PREVUID]                    = 'PrevUID';
1709                         $EBMLidList[EBML_ID_SAMPLINGFREQUENCY]          = 'SamplingFrequency';
1710                         $EBMLidList[EBML_ID_SEEK]                       = 'Seek';
1711                         $EBMLidList[EBML_ID_SEEKHEAD]                   = 'SeekHead';
1712                         $EBMLidList[EBML_ID_SEEKID]                     = 'SeekID';
1713                         $EBMLidList[EBML_ID_SEEKPOSITION]               = 'SeekPosition';
1714                         $EBMLidList[EBML_ID_SEGMENT]                    = 'Segment';
1715                         $EBMLidList[EBML_ID_SEGMENTFAMILY]              = 'SegmentFamily';
1716                         $EBMLidList[EBML_ID_SEGMENTFILENAME]            = 'SegmentFilename';
1717                         $EBMLidList[EBML_ID_SEGMENTUID]                 = 'SegmentUID';
1718                         $EBMLidList[EBML_ID_SIMPLETAG]                  = 'SimpleTag';
1719                         $EBMLidList[EBML_ID_CLUSTERSLICES]              = 'ClusterSlices';
1720                         $EBMLidList[EBML_ID_STEREOMODE]                 = 'StereoMode';
1721                         $EBMLidList[EBML_ID_OLDSTEREOMODE]              = 'OldStereoMode';
1722                         $EBMLidList[EBML_ID_TAG]                        = 'Tag';
1723                         $EBMLidList[EBML_ID_TAGATTACHMENTUID]           = 'TagAttachmentUID';
1724                         $EBMLidList[EBML_ID_TAGBINARY]                  = 'TagBinary';
1725                         $EBMLidList[EBML_ID_TAGCHAPTERUID]              = 'TagChapterUID';
1726                         $EBMLidList[EBML_ID_TAGDEFAULT]                 = 'TagDefault';
1727                         $EBMLidList[EBML_ID_TAGEDITIONUID]              = 'TagEditionUID';
1728                         $EBMLidList[EBML_ID_TAGLANGUAGE]                = 'TagLanguage';
1729                         $EBMLidList[EBML_ID_TAGNAME]                    = 'TagName';
1730                         $EBMLidList[EBML_ID_TAGTRACKUID]                = 'TagTrackUID';
1731                         $EBMLidList[EBML_ID_TAGS]                       = 'Tags';
1732                         $EBMLidList[EBML_ID_TAGSTRING]                  = 'TagString';
1733                         $EBMLidList[EBML_ID_TARGETS]                    = 'Targets';
1734                         $EBMLidList[EBML_ID_TARGETTYPE]                 = 'TargetType';
1735                         $EBMLidList[EBML_ID_TARGETTYPEVALUE]            = 'TargetTypeValue';
1736                         $EBMLidList[EBML_ID_TIMECODESCALE]              = 'TimecodeScale';
1737                         $EBMLidList[EBML_ID_TITLE]                      = 'Title';
1738                         $EBMLidList[EBML_ID_TRACKENTRY]                 = 'TrackEntry';
1739                         $EBMLidList[EBML_ID_TRACKNUMBER]                = 'TrackNumber';
1740                         $EBMLidList[EBML_ID_TRACKOFFSET]                = 'TrackOffset';
1741                         $EBMLidList[EBML_ID_TRACKOVERLAY]               = 'TrackOverlay';
1742                         $EBMLidList[EBML_ID_TRACKS]                     = 'Tracks';
1743                         $EBMLidList[EBML_ID_TRACKTIMECODESCALE]         = 'TrackTimecodeScale';
1744                         $EBMLidList[EBML_ID_TRACKTRANSLATE]             = 'TrackTranslate';
1745                         $EBMLidList[EBML_ID_TRACKTRANSLATECODEC]        = 'TrackTranslateCodec';
1746                         $EBMLidList[EBML_ID_TRACKTRANSLATEEDITIONUID]   = 'TrackTranslateEditionUID';
1747                         $EBMLidList[EBML_ID_TRACKTRANSLATETRACKID]      = 'TrackTranslateTrackID';
1748                         $EBMLidList[EBML_ID_TRACKTYPE]                  = 'TrackType';
1749                         $EBMLidList[EBML_ID_TRACKUID]                   = 'TrackUID';
1750                         $EBMLidList[EBML_ID_VIDEO]                      = 'Video';
1751                         $EBMLidList[EBML_ID_VOID]                       = 'Void';
1752                         $EBMLidList[EBML_ID_WRITINGAPP]                 = 'WritingApp';
1753                 }
1754
1755                 return (isset($EBMLidList[$value]) ? $EBMLidList[$value] : dechex($value));
1756         }
1757
1758         public static function displayUnit($value) {
1759                 // http://www.matroska.org/technical/specs/index.html#DisplayUnit
1760                 static $units = array(
1761                         0 => 'pixels',
1762                         1 => 'centimeters',
1763                         2 => 'inches',
1764                         3 => 'Display Aspect Ratio');
1765
1766                 return (isset($units[$value]) ? $units[$value] : 'unknown');
1767         }
1768
1769         private static function getDefaultStreamInfo($streams)
1770         {
1771                 foreach (array_reverse($streams) as $stream) {
1772                         if ($stream['default']) {
1773                                 break;
1774                         }
1775                 }
1776
1777                 $unset = array('default', 'name');
1778                 foreach ($unset as $u) {
1779                         if (isset($stream[$u])) {
1780                                 unset($stream[$u]);
1781                         }
1782                 }
1783
1784                 $info = $stream;
1785                 $info['streams'] = $streams;
1786
1787                 return $info;
1788         }
1789
1790 }