2 /////////////////////////////////////////////////////////////////
3 /// getID3() by James Heinrich <info@getid3.org> //
4 // available at http://getid3.sourceforge.net //
5 // or http://www.getid3.org //
6 /////////////////////////////////////////////////////////////////
7 // See readme.txt for more details //
8 /////////////////////////////////////////////////////////////////
10 // module.audio.dts.php //
11 // module for analyzing DTS Audio files //
12 // dependencies: NONE //
14 /////////////////////////////////////////////////////////////////
18 * @tutorial http://wiki.multimedia.cx/index.php?title=DTS
20 class getid3_dts extends getid3_handler
23 * Default DTS syncword used in native .cpt or .dts formats
25 const syncword = "\x7F\xFE\x80\x01";
27 private $readBinDataOffset = 0;
30 * Possible syncwords indicating bitstream encoding
32 public static $syncwords = array(
33 0 => "\x7F\xFE\x80\x01", // raw big-endian
34 1 => "\xFE\x7F\x01\x80", // raw little-endian
35 2 => "\x1F\xFF\xE8\x00", // 14-bit big-endian
36 3 => "\xFF\x1F\x00\xE8"); // 14-bit little-endian
38 public function Analyze() {
39 $info = &$this->getid3->info;
40 $info['fileformat'] = 'dts';
42 $this->fseek($info['avdataoffset']);
43 $DTSheader = $this->fread(20); // we only need 2 words magic + 6 words frame header, but these words may be normal 16-bit words OR 14-bit words with 2 highest bits set to zero, so 8 words can be either 8*16/8 = 16 bytes OR 8*16*(16/14)/8 = 18.3 bytes
46 $sync = substr($DTSheader, 0, 4);
47 if (($encoding = array_search($sync, self::$syncwords)) !== false) {
49 $info['dts']['raw']['magic'] = $sync;
50 $this->readBinDataOffset = 32;
52 } elseif ($this->isDependencyFor('matroska')) {
54 // Matroska contains DTS without syncword encoded as raw big-endian format
56 $this->readBinDataOffset = 0;
60 unset($info['fileformat']);
61 return $this->error('Expecting "'.implode('| ', array_map('getid3_lib::PrintHexBytes', self::$syncwords)).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($sync).'"');
67 for ($word_offset = 0; $word_offset <= strlen($DTSheader); $word_offset += 2) {
69 case 0: // raw big-endian
70 $fhBS .= getid3_lib::BigEndian2Bin( substr($DTSheader, $word_offset, 2) );
72 case 1: // raw little-endian
73 $fhBS .= getid3_lib::BigEndian2Bin(strrev(substr($DTSheader, $word_offset, 2)));
75 case 2: // 14-bit big-endian
76 $fhBS .= substr(getid3_lib::BigEndian2Bin( substr($DTSheader, $word_offset, 2) ), 2, 14);
78 case 3: // 14-bit little-endian
79 $fhBS .= substr(getid3_lib::BigEndian2Bin(strrev(substr($DTSheader, $word_offset, 2))), 2, 14);
84 $info['dts']['raw']['frame_type'] = $this->readBinData($fhBS, 1);
85 $info['dts']['raw']['deficit_samples'] = $this->readBinData($fhBS, 5);
86 $info['dts']['flags']['crc_present'] = (bool) $this->readBinData($fhBS, 1);
87 $info['dts']['raw']['pcm_sample_blocks'] = $this->readBinData($fhBS, 7);
88 $info['dts']['raw']['frame_byte_size'] = $this->readBinData($fhBS, 14);
89 $info['dts']['raw']['channel_arrangement'] = $this->readBinData($fhBS, 6);
90 $info['dts']['raw']['sample_frequency'] = $this->readBinData($fhBS, 4);
91 $info['dts']['raw']['bitrate'] = $this->readBinData($fhBS, 5);
92 $info['dts']['flags']['embedded_downmix'] = (bool) $this->readBinData($fhBS, 1);
93 $info['dts']['flags']['dynamicrange'] = (bool) $this->readBinData($fhBS, 1);
94 $info['dts']['flags']['timestamp'] = (bool) $this->readBinData($fhBS, 1);
95 $info['dts']['flags']['auxdata'] = (bool) $this->readBinData($fhBS, 1);
96 $info['dts']['flags']['hdcd'] = (bool) $this->readBinData($fhBS, 1);
97 $info['dts']['raw']['extension_audio'] = $this->readBinData($fhBS, 3);
98 $info['dts']['flags']['extended_coding'] = (bool) $this->readBinData($fhBS, 1);
99 $info['dts']['flags']['audio_sync_insertion'] = (bool) $this->readBinData($fhBS, 1);
100 $info['dts']['raw']['lfe_effects'] = $this->readBinData($fhBS, 2);
101 $info['dts']['flags']['predictor_history'] = (bool) $this->readBinData($fhBS, 1);
102 if ($info['dts']['flags']['crc_present']) {
103 $info['dts']['raw']['crc16'] = $this->readBinData($fhBS, 16);
105 $info['dts']['flags']['mri_perfect_reconst'] = (bool) $this->readBinData($fhBS, 1);
106 $info['dts']['raw']['encoder_soft_version'] = $this->readBinData($fhBS, 4);
107 $info['dts']['raw']['copy_history'] = $this->readBinData($fhBS, 2);
108 $info['dts']['raw']['bits_per_sample'] = $this->readBinData($fhBS, 2);
109 $info['dts']['flags']['surround_es'] = (bool) $this->readBinData($fhBS, 1);
110 $info['dts']['flags']['front_sum_diff'] = (bool) $this->readBinData($fhBS, 1);
111 $info['dts']['flags']['surround_sum_diff'] = (bool) $this->readBinData($fhBS, 1);
112 $info['dts']['raw']['dialog_normalization'] = $this->readBinData($fhBS, 4);
115 $info['dts']['bitrate'] = self::bitrateLookup($info['dts']['raw']['bitrate']);
116 $info['dts']['bits_per_sample'] = self::bitPerSampleLookup($info['dts']['raw']['bits_per_sample']);
117 $info['dts']['sample_rate'] = self::sampleRateLookup($info['dts']['raw']['sample_frequency']);
118 $info['dts']['dialog_normalization'] = self::dialogNormalization($info['dts']['raw']['dialog_normalization'], $info['dts']['raw']['encoder_soft_version']);
119 $info['dts']['flags']['lossless'] = (($info['dts']['raw']['bitrate'] == 31) ? true : false);
120 $info['dts']['bitrate_mode'] = (($info['dts']['raw']['bitrate'] == 30) ? 'vbr' : 'cbr');
121 $info['dts']['channels'] = self::numChannelsLookup($info['dts']['raw']['channel_arrangement']);
122 $info['dts']['channel_arrangement'] = self::channelArrangementLookup($info['dts']['raw']['channel_arrangement']);
124 $info['audio']['dataformat'] = 'dts';
125 $info['audio']['lossless'] = $info['dts']['flags']['lossless'];
126 $info['audio']['bitrate_mode'] = $info['dts']['bitrate_mode'];
127 $info['audio']['bits_per_sample'] = $info['dts']['bits_per_sample'];
128 $info['audio']['sample_rate'] = $info['dts']['sample_rate'];
129 $info['audio']['channels'] = $info['dts']['channels'];
130 $info['audio']['bitrate'] = $info['dts']['bitrate'];
131 if (isset($info['avdataend']) && !empty($info['dts']['bitrate']) && is_numeric($info['dts']['bitrate'])) {
132 $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) / ($info['dts']['bitrate'] / 8);
133 if (($encoding == 2) || ($encoding == 3)) {
134 // 14-bit data packed into 16-bit words, so the playtime is wrong because only (14/16) of the bytes in the data portion of the file are used at the specified bitrate
135 $info['playtime_seconds'] *= (14 / 16);
141 private function readBinData($bin, $length) {
142 $data = substr($bin, $this->readBinDataOffset, $length);
143 $this->readBinDataOffset += $length;
145 return bindec($data);
148 public static function bitrateLookup($index) {
149 static $lookup = array(
183 return (isset($lookup[$index]) ? $lookup[$index] : false);
186 public static function sampleRateLookup($index) {
187 static $lookup = array(
205 return (isset($lookup[$index]) ? $lookup[$index] : false);
208 public static function bitPerSampleLookup($index) {
209 static $lookup = array(
215 return (isset($lookup[$index]) ? $lookup[$index] : false);
218 public static function numChannelsLookup($index) {
256 public static function channelArrangementLookup($index) {
257 static $lookup = array(
259 1 => 'A + B (dual mono)',
260 2 => 'L + R (stereo)',
261 3 => '(L+R) + (L-R) (sum-difference)',
262 4 => 'LT + RT (left and right total)',
265 7 => 'C + L + R + S',
266 8 => 'L + R + SL + SR',
267 9 => 'C + L + R + SL + SR',
268 10 => 'CL + CR + L + R + SL + SR',
269 11 => 'C + L + R+ LR + RR + OV',
270 12 => 'CF + CR + LF + RF + LR + RR',
271 13 => 'CL + C + CR + L + R + SL + SR',
272 14 => 'CL + CR + L + R + SL1 + SL2 + SR1 + SR2',
273 15 => 'CL + C+ CR + L + R + SL + S + SR',
275 return (isset($lookup[$index]) ? $lookup[$index] : 'user-defined');
278 public static function dialogNormalization($index, $version) {
284 return 0 - 16 - $index;