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Diffstat (limited to 'modules/getid3/module.audio.dts.php')
| -rw-r--r-- | modules/getid3/module.audio.dts.php | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/modules/getid3/module.audio.dts.php b/modules/getid3/module.audio.dts.php new file mode 100644 index 00000000..beb520fb --- /dev/null +++ b/modules/getid3/module.audio.dts.php @@ -0,0 +1,254 @@ +<?php +// +----------------------------------------------------------------------+ +// | PHP version 5 | +// +----------------------------------------------------------------------+ +// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen | +// +----------------------------------------------------------------------+ +// | This source file is subject to version 2 of the GPL license, | +// | that is bundled with this package in the file license.txt and is | +// | available through the world-wide-web at the following url: | +// | http://www.gnu.org/copyleft/gpl.html | +// +----------------------------------------------------------------------+ +// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org | +// +----------------------------------------------------------------------+ +// | Authors: James Heinrich <infoØgetid3*org> | +// | Allan Hansen <ahØartemis*dk> | +// +----------------------------------------------------------------------+ +// | module.audio.dts.php | +// | Module for analyzing DTS audio files | +// | dependencies: NONE | +// +----------------------------------------------------------------------+ +// +// $Id: module.audio.dts.php,v 1.2 2006/11/16 13:14:26 ah Exp $ + + + +// 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/ + +class getid3_dts extends getid3_handler +{ + + public function Analyze() { + + $getid3 = $this->getid3; + + $getid3->info['dts'] = array (); + $info_dts = &$getid3->info['dts']; + + $getid3->info['fileformat'] = 'dts'; + + fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); + $header = fread($getid3->fp, 16); + + $fhBS = getid3_lib::BigEndian2Bin(substr($header, 4, 12)); + $bs_offset = 0; + $info_dts['raw']['frame_type'] = bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; + $info_dts['raw']['deficit_samples'] = bindec(substr($fhBS, $bs_offset, 5)); $bs_offset += 5; + $info_dts['flags']['crc_present'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; + $info_dts['raw']['pcm_sample_blocks'] = bindec(substr($fhBS, $bs_offset, 7)); $bs_offset += 7; + $info_dts['raw']['frame_byte_size'] = bindec(substr($fhBS, $bs_offset, 14)); $bs_offset += 14; + $info_dts['raw']['channel_arrangement'] = bindec(substr($fhBS, $bs_offset, 6)); $bs_offset += 6; + $info_dts['raw']['sample_frequency'] = bindec(substr($fhBS, $bs_offset, 4)); $bs_offset += 4; + $info_dts['raw']['bitrate'] = bindec(substr($fhBS, $bs_offset, 5)); $bs_offset += 5; + $info_dts['flags']['embedded_downmix'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; + $info_dts['flags']['dynamicrange'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; + $info_dts['flags']['timestamp'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; + $info_dts['flags']['auxdata'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; + $info_dts['flags']['hdcd'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; + $info_dts['raw']['extension_audio'] = bindec(substr($fhBS, $bs_offset, 3)); $bs_offset += 3; + $info_dts['flags']['extended_coding'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; + $info_dts['flags']['audio_sync_insertion'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; + $info_dts['raw']['lfe_effects'] = bindec(substr($fhBS, $bs_offset, 2)); $bs_offset += 2; + $info_dts['flags']['predictor_history'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; + if ($info_dts['flags']['crc_present']) { + $info_dts['raw']['crc16'] = bindec(substr($fhBS, $bs_offset, 16)); $bs_offset += 16; + } + $info_dts['flags']['mri_perfect_reconst'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; + $info_dts['raw']['encoder_soft_version'] = bindec(substr($fhBS, $bs_offset, 4)); $bs_offset += 4; + $info_dts['raw']['copy_history'] = bindec(substr($fhBS, $bs_offset, 2)); $bs_offset += 2; + $info_dts['raw']['bits_per_sample'] = bindec(substr($fhBS, $bs_offset, 2)); $bs_offset += 2; + $info_dts['flags']['surround_es'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; + $info_dts['flags']['front_sum_diff'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; + $info_dts['flags']['surround_sum_diff'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1; + $info_dts['raw']['dialog_normalization'] = bindec(substr($fhBS, $bs_offset, 4)); $bs_offset += 4; + + + $info_dts['bitrate'] = $this->DTSbitrateLookup($info_dts['raw']['bitrate']); + $info_dts['bits_per_sample'] = $this->DTSbitPerSampleLookup($info_dts['raw']['bits_per_sample']); + $info_dts['sample_rate'] = $this->DTSsampleRateLookup($info_dts['raw']['sample_frequency']); + $info_dts['dialog_normalization'] = $this->DTSdialogNormalization($info_dts['raw']['dialog_normalization'], $info_dts['raw']['encoder_soft_version']); + $info_dts['flags']['lossless'] = (($info_dts['raw']['bitrate'] == 31) ? true : false); + $info_dts['bitrate_mode'] = (($info_dts['raw']['bitrate'] == 30) ? 'vbr' : 'cbr'); + $info_dts['channels'] = $this->DTSnumChannelsLookup($info_dts['raw']['channel_arrangement']); + $info_dts['channel_arrangement'] = $this->DTSchannelArrangementLookup($info_dts['raw']['channel_arrangement']); + + $getid3->info['audio']['dataformat'] = 'dts'; + $getid3->info['audio']['lossless'] = $info_dts['flags']['lossless']; + $getid3->info['audio']['bitrate_mode'] = $info_dts['bitrate_mode']; + $getid3->info['audio']['bits_per_sample'] = $info_dts['bits_per_sample']; + $getid3->info['audio']['sample_rate'] = $info_dts['sample_rate']; + $getid3->info['audio']['channels'] = $info_dts['channels']; + $getid3->info['audio']['bitrate'] = $info_dts['bitrate']; + $getid3->info['playtime_seconds'] = ($getid3->info['avdataend'] - $getid3->info['avdataoffset']) / ($info_dts['bitrate'] / 8); + + return true; + } + + + public static function DTSbitrateLookup($index) { + + static $lookup = array ( + 0 => 32000, + 1 => 56000, + 2 => 64000, + 3 => 96000, + 4 => 112000, + 5 => 128000, + 6 => 192000, + 7 => 224000, + 8 => 256000, + 9 => 320000, + 10 => 384000, + 11 => 448000, + 12 => 512000, + 13 => 576000, + 14 => 640000, + 15 => 768000, + 16 => 960000, + 17 => 1024000, + 18 => 1152000, + 19 => 1280000, + 20 => 1344000, + 21 => 1408000, + 22 => 1411200, + 23 => 1472000, + 24 => 1536000, + 25 => 1920000, + 26 => 2048000, + 27 => 3072000, + 28 => 3840000, + 29 => 'open', + 30 => 'variable', + 31 => 'lossless' + ); + return @$lookup[$index]; + } + + + public static function DTSsampleRateLookup($index) { + + static $lookup = array ( + 0 => 'invalid', + 1 => 8000, + 2 => 16000, + 3 => 32000, + 4 => 'invalid', + 5 => 'invalid', + 6 => 11025, + 7 => 22050, + 8 => 44100, + 9 => 'invalid', + 10 => 'invalid', + 11 => 12000, + 12 => 24000, + 13 => 48000, + 14 => 'invalid', + 15 => 'invalid' + ); + return @$lookup[$index]; + } + + + public static function DTSbitPerSampleLookup($index) { + + static $lookup = array ( + 0 => 16, + 1 => 20, + 2 => 24, + 3 => 24, + ); + return @$lookup[$index]; + } + + + public static function DTSnumChannelsLookup($index) { + + switch ($index) { + case 0: + return 1; + + case 1: + case 2: + case 3: + case 4: + return 2; + + case 5: + case 6: + return 3; + + case 7: + case 8: + return 4; + + case 9: + return 5; + + case 10: + case 11: + case 12: + return 6; + + case 13: + return 7; + + case 14: + case 15: + return 8; + } + return false; + } + + + public static function DTSchannelArrangementLookup($index) { + + static $lookup = array ( + 0 => 'A', + 1 => 'A + B (dual mono)', + 2 => 'L + R (stereo)', + 3 => '(L+R) + (L-R) (sum-difference)', + 4 => 'LT + RT (left and right total)', + 5 => 'C + L + R', + 6 => 'L + R + S', + 7 => 'C + L + R + S', + 8 => 'L + R + SL + SR', + 9 => 'C + L + R + SL + SR', + 10 => 'CL + CR + L + R + SL + SR', + 11 => 'C + L + R+ LR + RR + OV', + 12 => 'CF + CR + LF + RF + LR + RR', + 13 => 'CL + C + CR + L + R + SL + SR', + 14 => 'CL + CR + L + R + SL1 + SL2 + SR1 + SR2', + 15 => 'CL + C+ CR + L + R + SL + S + SR', + ); + return (@$lookup[$index] ? @$lookup[$index] : 'user-defined'); + } + + + public static function DTSdialogNormalization($index, $version) { + + switch ($version) { + case 7: + return 0 - $index; + + case 6: + return 0 - 16 - $index; + } + return false; + } + +} + + +?>
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