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-rw-r--r--modules/getid3/module.audio.dts.php140
1 files changed, 91 insertions, 49 deletions
diff --git a/modules/getid3/module.audio.dts.php b/modules/getid3/module.audio.dts.php
index 5b910940..79982ccc 100644
--- a/modules/getid3/module.audio.dts.php
+++ b/modules/getid3/module.audio.dts.php
@@ -14,64 +14,102 @@
/////////////////////////////////////////////////////////////////
+/**
+* @tutorial http://wiki.multimedia.cx/index.php?title=DTS
+*/
class getid3_dts extends getid3_handler
{
+ /**
+ * Default DTS syncword used in native .cpt or .dts formats
+ */
const syncword = "\x7F\xFE\x80\x01";
- public function Analyze() {
- $info = &$this->getid3->info;
+ private $readBinDataOffset = 0;
- // Specs taken from "DTS Coherent Acoustics;Core and Extensions, ETSI TS 102 114 V1.2.1 (2002-12)"
- // (http://pda.etsi.org/pda/queryform.asp)
- // With thanks to Gambit <macteam@users.sourceforge.net> http://mac.sourceforge.net/atl/
+ /**
+ * 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
+ public function Analyze() {
+ $info = &$this->getid3->info;
$info['fileformat'] = 'dts';
$this->fseek($info['avdataoffset']);
- $DTSheader = $this->fread(16);
-
- if (strpos($DTSheader, self::syncword) === 0) {
- $info['dts']['raw']['magic'] = self::syncword;
- $offset = 4;
- } else {
- if (!$this->isDependencyFor('matroska')) {
- unset($info['fileformat']);
- return $this->error('Expecting "'.getid3_lib::PrintHexBytes(self::syncword).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($DTSheader, 0, 4)).'"');
+ $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
+
+ // 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;
+ $this->readBinDataOffset = 0;
+
+ } else {
+
+ unset($info['fileformat']);
+ return $this->error('Expecting "'.implode('| ', array_map('getid3_lib::PrintHexBytes', self::$syncwords)).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($sync).'"');
+
+ }
+
+ // 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;
}
- $offset = 0;
}
- $fhBS = getid3_lib::BigEndian2Bin(substr($DTSheader, $offset, 12));
- $bsOffset = 0;
- $info['dts']['raw']['frame_type'] = $this->readBinData($fhBS, $bsOffset, 1);
- $info['dts']['raw']['deficit_samples'] = $this->readBinData($fhBS, $bsOffset, 5);
- $info['dts']['flags']['crc_present'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
- $info['dts']['raw']['pcm_sample_blocks'] = $this->readBinData($fhBS, $bsOffset, 7);
- $info['dts']['raw']['frame_byte_size'] = $this->readBinData($fhBS, $bsOffset, 14);
- $info['dts']['raw']['channel_arrangement'] = $this->readBinData($fhBS, $bsOffset, 6);
- $info['dts']['raw']['sample_frequency'] = $this->readBinData($fhBS, $bsOffset, 4);
- $info['dts']['raw']['bitrate'] = $this->readBinData($fhBS, $bsOffset, 5);
- $info['dts']['flags']['embedded_downmix'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
- $info['dts']['flags']['dynamicrange'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
- $info['dts']['flags']['timestamp'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
- $info['dts']['flags']['auxdata'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
- $info['dts']['flags']['hdcd'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
- $info['dts']['raw']['extension_audio'] = $this->readBinData($fhBS, $bsOffset, 3);
- $info['dts']['flags']['extended_coding'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
- $info['dts']['flags']['audio_sync_insertion'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
- $info['dts']['raw']['lfe_effects'] = $this->readBinData($fhBS, $bsOffset, 2);
- $info['dts']['flags']['predictor_history'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
+ $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);
if ($info['dts']['flags']['crc_present']) {
- $info['dts']['raw']['crc16'] = $this->readBinData($fhBS, $bsOffset, 16);
+ $info['dts']['raw']['crc16'] = $this->readBinData($fhBS, 16);
}
- $info['dts']['flags']['mri_perfect_reconst'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
- $info['dts']['raw']['encoder_soft_version'] = $this->readBinData($fhBS, $bsOffset, 4);
- $info['dts']['raw']['copy_history'] = $this->readBinData($fhBS, $bsOffset, 2);
- $info['dts']['raw']['bits_per_sample'] = $this->readBinData($fhBS, $bsOffset, 2);
- $info['dts']['flags']['surround_es'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
- $info['dts']['flags']['front_sum_diff'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
- $info['dts']['flags']['surround_sum_diff'] = (bool) $this->readBinData($fhBS, $bsOffset, 1);
- $info['dts']['raw']['dialog_normalization'] = $this->readBinData($fhBS, $bsOffset, 4);
+ $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']);
@@ -90,16 +128,20 @@ class getid3_dts extends getid3_handler
$info['audio']['sample_rate'] = $info['dts']['sample_rate'];
$info['audio']['channels'] = $info['dts']['channels'];
$info['audio']['bitrate'] = $info['dts']['bitrate'];
- if (isset($info['avdataend'])) {
+ if (isset($info['avdataend']) && !empty($info['dts']['bitrate']) && is_numeric($info['dts']['bitrate'])) {
$info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) / ($info['dts']['bitrate'] / 8);
+ 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
+ $info['playtime_seconds'] *= (14 / 16);
+ }
}
-
return true;
}
- private function readBinData($bin, &$offset, $length) {
- $data = substr($bin, $offset, $length);
- $offset += $length;
+ private function readBinData($bin, $length) {
+ $data = substr($bin, $this->readBinDataOffset, $length);
+ $this->readBinDataOffset += $length;
+
return bindec($data);
}
generated by cgit (git 2.34.1) at 2025-08-14 02:03:08 +0000