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sources/3rdparty/getid3/module.audio.dts.php
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<?php ///////////////////////////////////////////////////////////////// /// getID3() by James Heinrich <info@getid3.org> // // available at http://getid3.sourceforge.net // // or http://www.getid3.org // ///////////////////////////////////////////////////////////////// // See readme.txt for more details // ///////////////////////////////////////////////////////////////// // // // module.audio.dts.php // // module for analyzing DTS Audio files // // dependencies: NONE // // // ///////////////////////////////////////////////////////////////// |
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/** * @tutorial http://wiki.multimedia.cx/index.php?title=DTS */ |
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class getid3_dts extends getid3_handler
{
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/**
* Default DTS syncword used in native .cpt or .dts formats
*/
const syncword = "\x7F\xFE\x80\x01";
private $readBinDataOffset = 0;
/**
* Possible syncwords indicating bitstream encoding
*/
public static $syncwords = array(
0 => "\x7F\xFE\x80\x01", // raw big-endian
1 => "\xFE\x7F\x01\x80", // raw little-endian
2 => "\x1F\xFF\xE8\x00", // 14-bit big-endian
3 => "\xFF\x1F\x00\xE8"); // 14-bit little-endian
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public function Analyze() {
$info = &$this->getid3->info;
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$info['fileformat'] = 'dts'; |
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$this->fseek($info['avdataoffset']); $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 |
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// check syncword
$sync = substr($DTSheader, 0, 4);
if (($encoding = array_search($sync, self::$syncwords)) !== false) {
$info['dts']['raw']['magic'] = $sync;
$this->readBinDataOffset = 32;
} elseif ($this->isDependencyFor('matroska')) {
// Matroska contains DTS without syncword encoded as raw big-endian format
$encoding = 0;
$this->readBinDataOffset = 0;
} else {
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unset($info['fileformat']);
return $this->error('Expecting "'.implode('| ', array_map('getid3_lib::PrintHexBytes', self::$syncwords)).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($sync).'"');
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} |
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// decode header
$fhBS = '';
for ($word_offset = 0; $word_offset <= strlen($DTSheader); $word_offset += 2) {
switch ($encoding) {
case 0: // raw big-endian
$fhBS .= getid3_lib::BigEndian2Bin( substr($DTSheader, $word_offset, 2) );
break;
case 1: // raw little-endian
$fhBS .= getid3_lib::BigEndian2Bin(strrev(substr($DTSheader, $word_offset, 2)));
break;
case 2: // 14-bit big-endian
$fhBS .= substr(getid3_lib::BigEndian2Bin( substr($DTSheader, $word_offset, 2) ), 2, 14);
break;
case 3: // 14-bit little-endian
$fhBS .= substr(getid3_lib::BigEndian2Bin(strrev(substr($DTSheader, $word_offset, 2))), 2, 14);
break;
}
}
$info['dts']['raw']['frame_type'] = $this->readBinData($fhBS, 1);
$info['dts']['raw']['deficit_samples'] = $this->readBinData($fhBS, 5);
$info['dts']['flags']['crc_present'] = (bool) $this->readBinData($fhBS, 1);
$info['dts']['raw']['pcm_sample_blocks'] = $this->readBinData($fhBS, 7);
$info['dts']['raw']['frame_byte_size'] = $this->readBinData($fhBS, 14);
$info['dts']['raw']['channel_arrangement'] = $this->readBinData($fhBS, 6);
$info['dts']['raw']['sample_frequency'] = $this->readBinData($fhBS, 4);
$info['dts']['raw']['bitrate'] = $this->readBinData($fhBS, 5);
$info['dts']['flags']['embedded_downmix'] = (bool) $this->readBinData($fhBS, 1);
$info['dts']['flags']['dynamicrange'] = (bool) $this->readBinData($fhBS, 1);
$info['dts']['flags']['timestamp'] = (bool) $this->readBinData($fhBS, 1);
$info['dts']['flags']['auxdata'] = (bool) $this->readBinData($fhBS, 1);
$info['dts']['flags']['hdcd'] = (bool) $this->readBinData($fhBS, 1);
$info['dts']['raw']['extension_audio'] = $this->readBinData($fhBS, 3);
$info['dts']['flags']['extended_coding'] = (bool) $this->readBinData($fhBS, 1);
$info['dts']['flags']['audio_sync_insertion'] = (bool) $this->readBinData($fhBS, 1);
$info['dts']['raw']['lfe_effects'] = $this->readBinData($fhBS, 2);
$info['dts']['flags']['predictor_history'] = (bool) $this->readBinData($fhBS, 1);
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if ($info['dts']['flags']['crc_present']) {
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$info['dts']['raw']['crc16'] = $this->readBinData($fhBS, 16); |
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} |
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$info['dts']['flags']['mri_perfect_reconst'] = (bool) $this->readBinData($fhBS, 1); $info['dts']['raw']['encoder_soft_version'] = $this->readBinData($fhBS, 4); $info['dts']['raw']['copy_history'] = $this->readBinData($fhBS, 2); $info['dts']['raw']['bits_per_sample'] = $this->readBinData($fhBS, 2); $info['dts']['flags']['surround_es'] = (bool) $this->readBinData($fhBS, 1); $info['dts']['flags']['front_sum_diff'] = (bool) $this->readBinData($fhBS, 1); $info['dts']['flags']['surround_sum_diff'] = (bool) $this->readBinData($fhBS, 1); $info['dts']['raw']['dialog_normalization'] = $this->readBinData($fhBS, 4); $info['dts']['bitrate'] = self::bitrateLookup($info['dts']['raw']['bitrate']); $info['dts']['bits_per_sample'] = self::bitPerSampleLookup($info['dts']['raw']['bits_per_sample']); $info['dts']['sample_rate'] = self::sampleRateLookup($info['dts']['raw']['sample_frequency']); $info['dts']['dialog_normalization'] = self::dialogNormalization($info['dts']['raw']['dialog_normalization'], $info['dts']['raw']['encoder_soft_version']); |
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$info['dts']['flags']['lossless'] = (($info['dts']['raw']['bitrate'] == 31) ? true : false); $info['dts']['bitrate_mode'] = (($info['dts']['raw']['bitrate'] == 30) ? 'vbr' : 'cbr'); |
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$info['dts']['channels'] = self::numChannelsLookup($info['dts']['raw']['channel_arrangement']); $info['dts']['channel_arrangement'] = self::channelArrangementLookup($info['dts']['raw']['channel_arrangement']); |
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$info['audio']['dataformat'] = 'dts'; $info['audio']['lossless'] = $info['dts']['flags']['lossless']; $info['audio']['bitrate_mode'] = $info['dts']['bitrate_mode']; $info['audio']['bits_per_sample'] = $info['dts']['bits_per_sample']; $info['audio']['sample_rate'] = $info['dts']['sample_rate']; $info['audio']['channels'] = $info['dts']['channels']; $info['audio']['bitrate'] = $info['dts']['bitrate']; |
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if (isset($info['avdataend']) && !empty($info['dts']['bitrate']) && is_numeric($info['dts']['bitrate'])) {
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$info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) / ($info['dts']['bitrate'] / 8); |
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if (($encoding == 2) || ($encoding == 3)) {
// 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
$info['playtime_seconds'] *= (14 / 16);
}
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} |
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return true; } |
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private function readBinData($bin, $length) {
$data = substr($bin, $this->readBinDataOffset, $length);
$this->readBinDataOffset += $length;
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return bindec($data); } |
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public static function bitrateLookup($index) {
static $lookup = array(
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0 => 32000, 1 => 56000, 2 => 64000, 3 => 96000, 4 => 112000, 5 => 128000, 6 => 192000, 7 => 224000, 8 => 256000, 9 => 320000, 10 => 384000, 11 => 448000, 12 => 512000, 13 => 576000, 14 => 640000, 15 => 768000, 16 => 960000, 17 => 1024000, 18 => 1152000, 19 => 1280000, 20 => 1344000, 21 => 1408000, 22 => 1411200, 23 => 1472000, 24 => 1536000, 25 => 1920000, 26 => 2048000, 27 => 3072000, 28 => 3840000, 29 => 'open', 30 => 'variable', |
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31 => 'lossless', |
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); |
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return (isset($lookup[$index]) ? $lookup[$index] : false); |
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} |
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public static function sampleRateLookup($index) {
static $lookup = array(
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0 => 'invalid', 1 => 8000, 2 => 16000, 3 => 32000, 4 => 'invalid', 5 => 'invalid', 6 => 11025, 7 => 22050, 8 => 44100, 9 => 'invalid', 10 => 'invalid', 11 => 12000, 12 => 24000, 13 => 48000, 14 => 'invalid', |
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15 => 'invalid', |
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); |
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return (isset($lookup[$index]) ? $lookup[$index] : false); |
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} |
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public static function bitPerSampleLookup($index) {
static $lookup = array(
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0 => 16, 1 => 20, 2 => 24, 3 => 24, ); |
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return (isset($lookup[$index]) ? $lookup[$index] : false); |
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} |
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public static function numChannelsLookup($index) {
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switch ($index) {
case 0:
return 1;
break;
case 1:
case 2:
case 3:
case 4:
return 2;
break;
case 5:
case 6:
return 3;
break;
case 7:
case 8:
return 4;
break;
case 9:
return 5;
break;
case 10:
case 11:
case 12:
return 6;
break;
case 13:
return 7;
break;
case 14:
case 15:
return 8;
break;
}
return false;
}
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public static function channelArrangementLookup($index) {
static $lookup = array(
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0 => 'A', 1 => 'A + B (dual mono)', 2 => 'L + R (stereo)', 3 => '(L+R) + (L-R) (sum-difference)', 4 => 'LT + RT (left and right total)', 5 => 'C + L + R', 6 => 'L + R + S', 7 => 'C + L + R + S', 8 => 'L + R + SL + SR', 9 => 'C + L + R + SL + SR', 10 => 'CL + CR + L + R + SL + SR', 11 => 'C + L + R+ LR + RR + OV', 12 => 'CF + CR + LF + RF + LR + RR', 13 => 'CL + C + CR + L + R + SL + SR', 14 => 'CL + CR + L + R + SL1 + SL2 + SR1 + SR2', 15 => 'CL + C+ CR + L + R + SL + S + SR', ); |
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return (isset($lookup[$index]) ? $lookup[$index] : 'user-defined'); |
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} |
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public static function dialogNormalization($index, $version) {
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switch ($version) {
case 7:
return 0 - $index;
break;
case 6:
return 0 - 16 - $index;
break;
}
return false;
}
}
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