rlm@3: <?php
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | PHP version 5 |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | This source file is subject to version 2 of the GPL license, |
rlm@3: // | that is bundled with this package in the file license.txt and is |
rlm@3: // | available through the world-wide-web at the following url: |
rlm@3: // | http://www.gnu.org/copyleft/gpl.html |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | Authors: James Heinrich <infoØgetid3*org> |
rlm@3: // | Allan Hansen <ahØartemis*dk> |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: // | module.audio.dts.php |
rlm@3: // | Module for analyzing DTS audio files |
rlm@3: // | dependencies: NONE |
rlm@3: // +----------------------------------------------------------------------+
rlm@3: //
rlm@3: // $Id: module.audio.dts.php,v 1.2 2006/11/16 13:14:26 ah Exp $
rlm@3:
rlm@3:
rlm@3:
rlm@3: // Specs taken from "DTS Coherent Acoustics;Core and Extensions, ETSI TS 102 114 V1.2.1 (2002-12)"
rlm@3: // (http://pda.etsi.org/pda/queryform.asp)
rlm@3: // With thanks to Gambit <macteam@users.sourceforge.net> http://mac.sourceforge.net/atl/
rlm@3:
rlm@3: class getid3_dts extends getid3_handler
rlm@3: {
rlm@3:
rlm@3: public function Analyze() {
rlm@3:
rlm@3: $getid3 = $this->getid3;
rlm@3:
rlm@3: $getid3->info['dts'] = array ();
rlm@3: $info_dts = &$getid3->info['dts'];
rlm@3:
rlm@3: $getid3->info['fileformat'] = 'dts';
rlm@3:
rlm@3: fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
rlm@3: $header = fread($getid3->fp, 16);
rlm@3:
rlm@3: $fhBS = getid3_lib::BigEndian2Bin(substr($header, 4, 12));
rlm@3: $bs_offset = 0;
rlm@3: $info_dts['raw']['frame_type'] = bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
rlm@3: $info_dts['raw']['deficit_samples'] = bindec(substr($fhBS, $bs_offset, 5)); $bs_offset += 5;
rlm@3: $info_dts['flags']['crc_present'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
rlm@3: $info_dts['raw']['pcm_sample_blocks'] = bindec(substr($fhBS, $bs_offset, 7)); $bs_offset += 7;
rlm@3: $info_dts['raw']['frame_byte_size'] = bindec(substr($fhBS, $bs_offset, 14)); $bs_offset += 14;
rlm@3: $info_dts['raw']['channel_arrangement'] = bindec(substr($fhBS, $bs_offset, 6)); $bs_offset += 6;
rlm@3: $info_dts['raw']['sample_frequency'] = bindec(substr($fhBS, $bs_offset, 4)); $bs_offset += 4;
rlm@3: $info_dts['raw']['bitrate'] = bindec(substr($fhBS, $bs_offset, 5)); $bs_offset += 5;
rlm@3: $info_dts['flags']['embedded_downmix'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
rlm@3: $info_dts['flags']['dynamicrange'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
rlm@3: $info_dts['flags']['timestamp'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
rlm@3: $info_dts['flags']['auxdata'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
rlm@3: $info_dts['flags']['hdcd'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
rlm@3: $info_dts['raw']['extension_audio'] = bindec(substr($fhBS, $bs_offset, 3)); $bs_offset += 3;
rlm@3: $info_dts['flags']['extended_coding'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
rlm@3: $info_dts['flags']['audio_sync_insertion'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
rlm@3: $info_dts['raw']['lfe_effects'] = bindec(substr($fhBS, $bs_offset, 2)); $bs_offset += 2;
rlm@3: $info_dts['flags']['predictor_history'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
rlm@3: if ($info_dts['flags']['crc_present']) {
rlm@3: $info_dts['raw']['crc16'] = bindec(substr($fhBS, $bs_offset, 16)); $bs_offset += 16;
rlm@3: }
rlm@3: $info_dts['flags']['mri_perfect_reconst'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
rlm@3: $info_dts['raw']['encoder_soft_version'] = bindec(substr($fhBS, $bs_offset, 4)); $bs_offset += 4;
rlm@3: $info_dts['raw']['copy_history'] = bindec(substr($fhBS, $bs_offset, 2)); $bs_offset += 2;
rlm@3: $info_dts['raw']['bits_per_sample'] = bindec(substr($fhBS, $bs_offset, 2)); $bs_offset += 2;
rlm@3: $info_dts['flags']['surround_es'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
rlm@3: $info_dts['flags']['front_sum_diff'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
rlm@3: $info_dts['flags']['surround_sum_diff'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
rlm@3: $info_dts['raw']['dialog_normalization'] = bindec(substr($fhBS, $bs_offset, 4)); $bs_offset += 4;
rlm@3:
rlm@3:
rlm@3: $info_dts['bitrate'] = $this->DTSbitrateLookup($info_dts['raw']['bitrate']);
rlm@3: $info_dts['bits_per_sample'] = $this->DTSbitPerSampleLookup($info_dts['raw']['bits_per_sample']);
rlm@3: $info_dts['sample_rate'] = $this->DTSsampleRateLookup($info_dts['raw']['sample_frequency']);
rlm@3: $info_dts['dialog_normalization'] = $this->DTSdialogNormalization($info_dts['raw']['dialog_normalization'], $info_dts['raw']['encoder_soft_version']);
rlm@3: $info_dts['flags']['lossless'] = (($info_dts['raw']['bitrate'] == 31) ? true : false);
rlm@3: $info_dts['bitrate_mode'] = (($info_dts['raw']['bitrate'] == 30) ? 'vbr' : 'cbr');
rlm@3: $info_dts['channels'] = $this->DTSnumChannelsLookup($info_dts['raw']['channel_arrangement']);
rlm@3: $info_dts['channel_arrangement'] = $this->DTSchannelArrangementLookup($info_dts['raw']['channel_arrangement']);
rlm@3:
rlm@3: $getid3->info['audio']['dataformat'] = 'dts';
rlm@3: $getid3->info['audio']['lossless'] = $info_dts['flags']['lossless'];
rlm@3: $getid3->info['audio']['bitrate_mode'] = $info_dts['bitrate_mode'];
rlm@3: $getid3->info['audio']['bits_per_sample'] = $info_dts['bits_per_sample'];
rlm@3: $getid3->info['audio']['sample_rate'] = $info_dts['sample_rate'];
rlm@3: $getid3->info['audio']['channels'] = $info_dts['channels'];
rlm@3: $getid3->info['audio']['bitrate'] = $info_dts['bitrate'];
rlm@3: $getid3->info['playtime_seconds'] = ($getid3->info['avdataend'] - $getid3->info['avdataoffset']) / ($info_dts['bitrate'] / 8);
rlm@3:
rlm@3: return true;
rlm@3: }
rlm@3:
rlm@3:
rlm@3: public static function DTSbitrateLookup($index) {
rlm@3:
rlm@3: static $lookup = array (
rlm@3: 0 => 32000,
rlm@3: 1 => 56000,
rlm@3: 2 => 64000,
rlm@3: 3 => 96000,
rlm@3: 4 => 112000,
rlm@3: 5 => 128000,
rlm@3: 6 => 192000,
rlm@3: 7 => 224000,
rlm@3: 8 => 256000,
rlm@3: 9 => 320000,
rlm@3: 10 => 384000,
rlm@3: 11 => 448000,
rlm@3: 12 => 512000,
rlm@3: 13 => 576000,
rlm@3: 14 => 640000,
rlm@3: 15 => 768000,
rlm@3: 16 => 960000,
rlm@3: 17 => 1024000,
rlm@3: 18 => 1152000,
rlm@3: 19 => 1280000,
rlm@3: 20 => 1344000,
rlm@3: 21 => 1408000,
rlm@3: 22 => 1411200,
rlm@3: 23 => 1472000,
rlm@3: 24 => 1536000,
rlm@3: 25 => 1920000,
rlm@3: 26 => 2048000,
rlm@3: 27 => 3072000,
rlm@3: 28 => 3840000,
rlm@3: 29 => 'open',
rlm@3: 30 => 'variable',
rlm@3: 31 => 'lossless'
rlm@3: );
rlm@3: return @$lookup[$index];
rlm@3: }
rlm@3:
rlm@3:
rlm@3: public static function DTSsampleRateLookup($index) {
rlm@3:
rlm@3: static $lookup = array (
rlm@3: 0 => 'invalid',
rlm@3: 1 => 8000,
rlm@3: 2 => 16000,
rlm@3: 3 => 32000,
rlm@3: 4 => 'invalid',
rlm@3: 5 => 'invalid',
rlm@3: 6 => 11025,
rlm@3: 7 => 22050,
rlm@3: 8 => 44100,
rlm@3: 9 => 'invalid',
rlm@3: 10 => 'invalid',
rlm@3: 11 => 12000,
rlm@3: 12 => 24000,
rlm@3: 13 => 48000,
rlm@3: 14 => 'invalid',
rlm@3: 15 => 'invalid'
rlm@3: );
rlm@3: return @$lookup[$index];
rlm@3: }
rlm@3:
rlm@3:
rlm@3: public static function DTSbitPerSampleLookup($index) {
rlm@3:
rlm@3: static $lookup = array (
rlm@3: 0 => 16,
rlm@3: 1 => 20,
rlm@3: 2 => 24,
rlm@3: 3 => 24,
rlm@3: );
rlm@3: return @$lookup[$index];
rlm@3: }
rlm@3:
rlm@3:
rlm@3: public static function DTSnumChannelsLookup($index) {
rlm@3:
rlm@3: switch ($index) {
rlm@3: case 0:
rlm@3: return 1;
rlm@3:
rlm@3: case 1:
rlm@3: case 2:
rlm@3: case 3:
rlm@3: case 4:
rlm@3: return 2;
rlm@3:
rlm@3: case 5:
rlm@3: case 6:
rlm@3: return 3;
rlm@3:
rlm@3: case 7:
rlm@3: case 8:
rlm@3: return 4;
rlm@3:
rlm@3: case 9:
rlm@3: return 5;
rlm@3:
rlm@3: case 10:
rlm@3: case 11:
rlm@3: case 12:
rlm@3: return 6;
rlm@3:
rlm@3: case 13:
rlm@3: return 7;
rlm@3:
rlm@3: case 14:
rlm@3: case 15:
rlm@3: return 8;
rlm@3: }
rlm@3: return false;
rlm@3: }
rlm@3:
rlm@3:
rlm@3: public static function DTSchannelArrangementLookup($index) {
rlm@3:
rlm@3: static $lookup = array (
rlm@3: 0 => 'A',
rlm@3: 1 => 'A + B (dual mono)',
rlm@3: 2 => 'L + R (stereo)',
rlm@3: 3 => '(L+R) + (L-R) (sum-difference)',
rlm@3: 4 => 'LT + RT (left and right total)',
rlm@3: 5 => 'C + L + R',
rlm@3: 6 => 'L + R + S',
rlm@3: 7 => 'C + L + R + S',
rlm@3: 8 => 'L + R + SL + SR',
rlm@3: 9 => 'C + L + R + SL + SR',
rlm@3: 10 => 'CL + CR + L + R + SL + SR',
rlm@3: 11 => 'C + L + R+ LR + RR + OV',
rlm@3: 12 => 'CF + CR + LF + RF + LR + RR',
rlm@3: 13 => 'CL + C + CR + L + R + SL + SR',
rlm@3: 14 => 'CL + CR + L + R + SL1 + SL2 + SR1 + SR2',
rlm@3: 15 => 'CL + C+ CR + L + R + SL + S + SR',
rlm@3: );
rlm@3: return (@$lookup[$index] ? @$lookup[$index] : 'user-defined');
rlm@3: }
rlm@3:
rlm@3:
rlm@3: public static function DTSdialogNormalization($index, $version) {
rlm@3:
rlm@3: switch ($version) {
rlm@3: case 7:
rlm@3: return 0 - $index;
rlm@3:
rlm@3: case 6:
rlm@3: return 0 - 16 - $index;
rlm@3: }
rlm@3: return false;
rlm@3: }
rlm@3:
rlm@3: }
rlm@3:
rlm@3:
rlm@3: ?>