X-Git-Url: https://scripts.mit.edu/gitweb/autoinstallsdev/mediawiki.git/blobdiff_plain/19e297c21b10b1b8a3acad5e73fc71dcb35db44a..6932310fd58ebef145fa01eb76edf7150284d8ea:/vendor/james-heinrich/getid3/getid3/module.audio.voc.php diff --git a/vendor/james-heinrich/getid3/getid3/module.audio.voc.php b/vendor/james-heinrich/getid3/getid3/module.audio.voc.php new file mode 100644 index 00000000..3803d8a1 --- /dev/null +++ b/vendor/james-heinrich/getid3/getid3/module.audio.voc.php @@ -0,0 +1,205 @@ + // +// available at http://getid3.sourceforge.net // +// or http://www.getid3.org // +// also https://github.com/JamesHeinrich/getID3 // +///////////////////////////////////////////////////////////////// +// See readme.txt for more details // +///////////////////////////////////////////////////////////////// +// // +// module.audio.voc.php // +// module for analyzing Creative VOC Audio files // +// dependencies: NONE // +// /// +///////////////////////////////////////////////////////////////// + + +class getid3_voc extends getid3_handler +{ + + public function Analyze() { + $info = &$this->getid3->info; + + $OriginalAVdataOffset = $info['avdataoffset']; + $this->fseek($info['avdataoffset']); + $VOCheader = $this->fread(26); + + $magic = 'Creative Voice File'; + if (substr($VOCheader, 0, 19) != $magic) { + $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($VOCheader, 0, 19)).'"'); + return false; + } + + // shortcuts + $thisfile_audio = &$info['audio']; + $info['voc'] = array(); + $thisfile_voc = &$info['voc']; + + $info['fileformat'] = 'voc'; + $thisfile_audio['dataformat'] = 'voc'; + $thisfile_audio['bitrate_mode'] = 'cbr'; + $thisfile_audio['lossless'] = true; + $thisfile_audio['channels'] = 1; // might be overriden below + $thisfile_audio['bits_per_sample'] = 8; // might be overriden below + + // byte # Description + // ------ ------------------------------------------ + // 00-12 'Creative Voice File' + // 13 1A (eof to abort printing of file) + // 14-15 Offset of first datablock in .voc file (std 1A 00 in Intel Notation) + // 16-17 Version number (minor,major) (VOC-HDR puts 0A 01) + // 18-19 2's Comp of Ver. # + 1234h (VOC-HDR puts 29 11) + + $thisfile_voc['header']['datablock_offset'] = getid3_lib::LittleEndian2Int(substr($VOCheader, 20, 2)); + $thisfile_voc['header']['minor_version'] = getid3_lib::LittleEndian2Int(substr($VOCheader, 22, 1)); + $thisfile_voc['header']['major_version'] = getid3_lib::LittleEndian2Int(substr($VOCheader, 23, 1)); + + do { + + $BlockOffset = $this->ftell(); + $BlockData = $this->fread(4); + $BlockType = ord($BlockData{0}); + $BlockSize = getid3_lib::LittleEndian2Int(substr($BlockData, 1, 3)); + $ThisBlock = array(); + + getid3_lib::safe_inc($thisfile_voc['blocktypes'][$BlockType], 1); + switch ($BlockType) { + case 0: // Terminator + // do nothing, we'll break out of the loop down below + break; + + case 1: // Sound data + $BlockData .= $this->fread(2); + if ($info['avdataoffset'] <= $OriginalAVdataOffset) { + $info['avdataoffset'] = $this->ftell(); + } + $this->fseek($BlockSize - 2, SEEK_CUR); + + $ThisBlock['sample_rate_id'] = getid3_lib::LittleEndian2Int(substr($BlockData, 4, 1)); + $ThisBlock['compression_type'] = getid3_lib::LittleEndian2Int(substr($BlockData, 5, 1)); + + $ThisBlock['compression_name'] = $this->VOCcompressionTypeLookup($ThisBlock['compression_type']); + if ($ThisBlock['compression_type'] <= 3) { + $thisfile_voc['compressed_bits_per_sample'] = getid3_lib::CastAsInt(str_replace('-bit', '', $ThisBlock['compression_name'])); + } + + // Less accurate sample_rate calculation than the Extended block (#8) data (but better than nothing if Extended Block is not available) + if (empty($thisfile_audio['sample_rate'])) { + // SR byte = 256 - (1000000 / sample_rate) + $thisfile_audio['sample_rate'] = getid3_lib::trunc((1000000 / (256 - $ThisBlock['sample_rate_id'])) / $thisfile_audio['channels']); + } + break; + + case 2: // Sound continue + case 3: // Silence + case 4: // Marker + case 6: // Repeat + case 7: // End repeat + // nothing useful, just skip + $this->fseek($BlockSize, SEEK_CUR); + break; + + case 8: // Extended + $BlockData .= $this->fread(4); + + //00-01 Time Constant: + // Mono: 65536 - (256000000 / sample_rate) + // Stereo: 65536 - (256000000 / (sample_rate * 2)) + $ThisBlock['time_constant'] = getid3_lib::LittleEndian2Int(substr($BlockData, 4, 2)); + $ThisBlock['pack_method'] = getid3_lib::LittleEndian2Int(substr($BlockData, 6, 1)); + $ThisBlock['stereo'] = (bool) getid3_lib::LittleEndian2Int(substr($BlockData, 7, 1)); + + $thisfile_audio['channels'] = ($ThisBlock['stereo'] ? 2 : 1); + $thisfile_audio['sample_rate'] = getid3_lib::trunc((256000000 / (65536 - $ThisBlock['time_constant'])) / $thisfile_audio['channels']); + break; + + case 9: // data block that supersedes blocks 1 and 8. Used for stereo, 16 bit + $BlockData .= $this->fread(12); + if ($info['avdataoffset'] <= $OriginalAVdataOffset) { + $info['avdataoffset'] = $this->ftell(); + } + $this->fseek($BlockSize - 12, SEEK_CUR); + + $ThisBlock['sample_rate'] = getid3_lib::LittleEndian2Int(substr($BlockData, 4, 4)); + $ThisBlock['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($BlockData, 8, 1)); + $ThisBlock['channels'] = getid3_lib::LittleEndian2Int(substr($BlockData, 9, 1)); + $ThisBlock['wFormat'] = getid3_lib::LittleEndian2Int(substr($BlockData, 10, 2)); + + $ThisBlock['compression_name'] = $this->VOCwFormatLookup($ThisBlock['wFormat']); + if ($this->VOCwFormatActualBitsPerSampleLookup($ThisBlock['wFormat'])) { + $thisfile_voc['compressed_bits_per_sample'] = $this->VOCwFormatActualBitsPerSampleLookup($ThisBlock['wFormat']); + } + + $thisfile_audio['sample_rate'] = $ThisBlock['sample_rate']; + $thisfile_audio['bits_per_sample'] = $ThisBlock['bits_per_sample']; + $thisfile_audio['channels'] = $ThisBlock['channels']; + break; + + default: + $this->warning('Unhandled block type "'.$BlockType.'" at offset '.$BlockOffset); + $this->fseek($BlockSize, SEEK_CUR); + break; + } + + if (!empty($ThisBlock)) { + $ThisBlock['block_offset'] = $BlockOffset; + $ThisBlock['block_size'] = $BlockSize; + $ThisBlock['block_type_id'] = $BlockType; + $thisfile_voc['blocks'][] = $ThisBlock; + } + + } while (!feof($this->getid3->fp) && ($BlockType != 0)); + + // Terminator block doesn't have size field, so seek back 3 spaces + $this->fseek(-3, SEEK_CUR); + + ksort($thisfile_voc['blocktypes']); + + if (!empty($thisfile_voc['compressed_bits_per_sample'])) { + $info['playtime_seconds'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / ($thisfile_voc['compressed_bits_per_sample'] * $thisfile_audio['channels'] * $thisfile_audio['sample_rate']); + $thisfile_audio['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds']; + } + + return true; + } + + public function VOCcompressionTypeLookup($index) { + static $VOCcompressionTypeLookup = array( + 0 => '8-bit', + 1 => '4-bit', + 2 => '2.6-bit', + 3 => '2-bit' + ); + return (isset($VOCcompressionTypeLookup[$index]) ? $VOCcompressionTypeLookup[$index] : 'Multi DAC ('.($index - 3).') channels'); + } + + public function VOCwFormatLookup($index) { + static $VOCwFormatLookup = array( + 0x0000 => '8-bit unsigned PCM', + 0x0001 => 'Creative 8-bit to 4-bit ADPCM', + 0x0002 => 'Creative 8-bit to 3-bit ADPCM', + 0x0003 => 'Creative 8-bit to 2-bit ADPCM', + 0x0004 => '16-bit signed PCM', + 0x0006 => 'CCITT a-Law', + 0x0007 => 'CCITT u-Law', + 0x2000 => 'Creative 16-bit to 4-bit ADPCM' + ); + return (isset($VOCwFormatLookup[$index]) ? $VOCwFormatLookup[$index] : false); + } + + public function VOCwFormatActualBitsPerSampleLookup($index) { + static $VOCwFormatLookup = array( + 0x0000 => 8, + 0x0001 => 4, + 0x0002 => 3, + 0x0003 => 2, + 0x0004 => 16, + 0x0006 => 8, + 0x0007 => 8, + 0x2000 => 4 + ); + return (isset($VOCwFormatLookup[$index]) ? $VOCwFormatLookup[$index] : false); + } + +}