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source: extensions/charlies_content/getid3/getid3/module.audio.dts.php @ 3318

Last change on this file since 3318 was 3318, checked in by vdigital, 15 years ago
+ Add Charlies' content to depository
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Rev	Line
[3318]	1	<?php
	2	// +----------------------------------------------------------------------+
	3	// \| PHP version 5 \|
	4	// +----------------------------------------------------------------------+
	5	// \| Copyright (c) 2002-2006 James Heinrich, Allan Hansen \|
	6	// +----------------------------------------------------------------------+
	7	// \| This source file is subject to version 2 of the GPL license, \|
	8	// \| that is bundled with this package in the file license.txt and is \|
	9	// \| available through the world-wide-web at the following url: \|
	10	// \| http://www.gnu.org/copyleft/gpl.html \|
	11	// +----------------------------------------------------------------------+
	12	// \| getID3() - http://getid3.sourceforge.net or http://www.getid3.org \|
	13	// +----------------------------------------------------------------------+
	14	// \| Authors: James Heinrich <infoØgetid3*org> \|
	15	// \| Allan Hansen <ahØartemis*dk> \|
	16	// +----------------------------------------------------------------------+
	17	// \| module.audio.dts.php \|
	18	// \| Module for analyzing DTS audio files \|
	19	// \| dependencies: NONE \|
	20	// +----------------------------------------------------------------------+
	21	//
	22	// $Id: module.audio.dts.php 3318 2009-05-20 21:54:10Z vdigital $
	23
	24
	25
	26	// Specs taken from "DTS Coherent Acoustics;Core and Extensions, ETSI TS 102 114 V1.2.1 (2002-12)"
	27	// (http://pda.etsi.org/pda/queryform.asp)
	28	// With thanks to Gambit <macteam@users.sourceforge.net> http://mac.sourceforge.net/atl/
	29
	30	class getid3_dts extends getid3_handler
	31	{
	32
	33	public function Analyze() {
	34
	35	$getid3 = $this->getid3;
	36
	37	$getid3->info['dts'] = array ();
	38	$info_dts = &$getid3->info['dts'];
	39
	40	$getid3->info['fileformat'] = 'dts';
	41
	42	fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
	43	$header = fread($getid3->fp, 16);
	44
	45	$fhBS = getid3_lib::BigEndian2Bin(substr($header, 4, 12));
	46	$bs_offset = 0;
	47	$info_dts['raw']['frame_type'] = bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
	48	$info_dts['raw']['deficit_samples'] = bindec(substr($fhBS, $bs_offset, 5)); $bs_offset += 5;
	49	$info_dts['flags']['crc_present'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
	50	$info_dts['raw']['pcm_sample_blocks'] = bindec(substr($fhBS, $bs_offset, 7)); $bs_offset += 7;
	51	$info_dts['raw']['frame_byte_size'] = bindec(substr($fhBS, $bs_offset, 14)); $bs_offset += 14;
	52	$info_dts['raw']['channel_arrangement'] = bindec(substr($fhBS, $bs_offset, 6)); $bs_offset += 6;
	53	$info_dts['raw']['sample_frequency'] = bindec(substr($fhBS, $bs_offset, 4)); $bs_offset += 4;
	54	$info_dts['raw']['bitrate'] = bindec(substr($fhBS, $bs_offset, 5)); $bs_offset += 5;
	55	$info_dts['flags']['embedded_downmix'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
	56	$info_dts['flags']['dynamicrange'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
	57	$info_dts['flags']['timestamp'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
	58	$info_dts['flags']['auxdata'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
	59	$info_dts['flags']['hdcd'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
	60	$info_dts['raw']['extension_audio'] = bindec(substr($fhBS, $bs_offset, 3)); $bs_offset += 3;
	61	$info_dts['flags']['extended_coding'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
	62	$info_dts['flags']['audio_sync_insertion'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
	63	$info_dts['raw']['lfe_effects'] = bindec(substr($fhBS, $bs_offset, 2)); $bs_offset += 2;
	64	$info_dts['flags']['predictor_history'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
	65	if ($info_dts['flags']['crc_present']) {
	66	$info_dts['raw']['crc16'] = bindec(substr($fhBS, $bs_offset, 16)); $bs_offset += 16;
	67	}
	68	$info_dts['flags']['mri_perfect_reconst'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
	69	$info_dts['raw']['encoder_soft_version'] = bindec(substr($fhBS, $bs_offset, 4)); $bs_offset += 4;
	70	$info_dts['raw']['copy_history'] = bindec(substr($fhBS, $bs_offset, 2)); $bs_offset += 2;
	71	$info_dts['raw']['bits_per_sample'] = bindec(substr($fhBS, $bs_offset, 2)); $bs_offset += 2;
	72	$info_dts['flags']['surround_es'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
	73	$info_dts['flags']['front_sum_diff'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
	74	$info_dts['flags']['surround_sum_diff'] = (bool) bindec(substr($fhBS, $bs_offset, 1)); $bs_offset += 1;
	75	$info_dts['raw']['dialog_normalization'] = bindec(substr($fhBS, $bs_offset, 4)); $bs_offset += 4;
	76
	77
	78	$info_dts['bitrate'] = $this->DTSbitrateLookup($info_dts['raw']['bitrate']);
	79	$info_dts['bits_per_sample'] = $this->DTSbitPerSampleLookup($info_dts['raw']['bits_per_sample']);
	80	$info_dts['sample_rate'] = $this->DTSsampleRateLookup($info_dts['raw']['sample_frequency']);
	81	$info_dts['dialog_normalization'] = $this->DTSdialogNormalization($info_dts['raw']['dialog_normalization'], $info_dts['raw']['encoder_soft_version']);
	82	$info_dts['flags']['lossless'] = (($info_dts['raw']['bitrate'] == 31) ? true : false);
	83	$info_dts['bitrate_mode'] = (($info_dts['raw']['bitrate'] == 30) ? 'vbr' : 'cbr');
	84	$info_dts['channels'] = $this->DTSnumChannelsLookup($info_dts['raw']['channel_arrangement']);
	85	$info_dts['channel_arrangement'] = $this->DTSchannelArrangementLookup($info_dts['raw']['channel_arrangement']);
	86
	87	$getid3->info['audio']['dataformat'] = 'dts';
	88	$getid3->info['audio']['lossless'] = $info_dts['flags']['lossless'];
	89	$getid3->info['audio']['bitrate_mode'] = $info_dts['bitrate_mode'];
	90	$getid3->info['audio']['bits_per_sample'] = $info_dts['bits_per_sample'];
	91	$getid3->info['audio']['sample_rate'] = $info_dts['sample_rate'];
	92	$getid3->info['audio']['channels'] = $info_dts['channels'];
	93	$getid3->info['audio']['bitrate'] = $info_dts['bitrate'];
	94	$getid3->info['playtime_seconds'] = ($getid3->info['avdataend'] - $getid3->info['avdataoffset']) / ($info_dts['bitrate'] / 8);
	95
	96	return true;
	97	}
	98
	99
	100	public static function DTSbitrateLookup($index) {
	101
	102	static $lookup = array (
	103	0 => 32000,
	104	1 => 56000,
	105	2 => 64000,
	106	3 => 96000,
	107	4 => 112000,
	108	5 => 128000,
	109	6 => 192000,
	110	7 => 224000,
	111	8 => 256000,
	112	9 => 320000,
	113	10 => 384000,
	114	11 => 448000,
	115	12 => 512000,
	116	13 => 576000,
	117	14 => 640000,
	118	15 => 768000,
	119	16 => 960000,
	120	17 => 1024000,
	121	18 => 1152000,
	122	19 => 1280000,
	123	20 => 1344000,
	124	21 => 1408000,
	125	22 => 1411200,
	126	23 => 1472000,
	127	24 => 1536000,
	128	25 => 1920000,
	129	26 => 2048000,
	130	27 => 3072000,
	131	28 => 3840000,
	132	29 => 'open',
	133	30 => 'variable',
	134	31 => 'lossless'
	135	);
	136	return @$lookup[$index];
	137	}
	138
	139
	140	public static function DTSsampleRateLookup($index) {
	141
	142	static $lookup = array (
	143	0 => 'invalid',
	144	1 => 8000,
	145	2 => 16000,
	146	3 => 32000,
	147	4 => 'invalid',
	148	5 => 'invalid',
	149	6 => 11025,
	150	7 => 22050,
	151	8 => 44100,
	152	9 => 'invalid',
	153	10 => 'invalid',
	154	11 => 12000,
	155	12 => 24000,
	156	13 => 48000,
	157	14 => 'invalid',
	158	15 => 'invalid'
	159	);
	160	return @$lookup[$index];
	161	}
	162
	163
	164	public static function DTSbitPerSampleLookup($index) {
	165
	166	static $lookup = array (
	167	0 => 16,
	168	1 => 20,
	169	2 => 24,
	170	3 => 24,
	171	);
	172	return @$lookup[$index];
	173	}
	174
	175
	176	public static function DTSnumChannelsLookup($index) {
	177
	178	switch ($index) {
	179	case 0:
	180	return 1;
	181
	182	case 1:
	183	case 2:
	184	case 3:
	185	case 4:
	186	return 2;
	187
	188	case 5:
	189	case 6:
	190	return 3;
	191
	192	case 7:
	193	case 8:
	194	return 4;
	195
	196	case 9:
	197	return 5;
	198
	199	case 10:
	200	case 11:
	201	case 12:
	202	return 6;
	203
	204	case 13:
	205	return 7;
	206
	207	case 14:
	208	case 15:
	209	return 8;
	210	}
	211	return false;
	212	}
	213
	214
	215	public static function DTSchannelArrangementLookup($index) {
	216
	217	static $lookup = array (
	218	0 => 'A',
	219	1 => 'A + B (dual mono)',
	220	2 => 'L + R (stereo)',
	221	3 => '(L+R) + (L-R) (sum-difference)',
	222	4 => 'LT + RT (left and right total)',
	223	5 => 'C + L + R',
	224	6 => 'L + R + S',
	225	7 => 'C + L + R + S',
	226	8 => 'L + R + SL + SR',
	227	9 => 'C + L + R + SL + SR',
	228	10 => 'CL + CR + L + R + SL + SR',
	229	11 => 'C + L + R+ LR + RR + OV',
	230	12 => 'CF + CR + LF + RF + LR + RR',
	231	13 => 'CL + C + CR + L + R + SL + SR',
	232	14 => 'CL + CR + L + R + SL1 + SL2 + SR1 + SR2',
	233	15 => 'CL + C+ CR + L + R + SL + S + SR',
	234	);
	235	return (@$lookup[$index] ? @$lookup[$index] : 'user-defined');
	236	}
	237
	238
	239	public static function DTSdialogNormalization($index, $version) {
	240
	241	switch ($version) {
	242	case 7:
	243	return 0 - $index;
	244
	245	case 6:
	246	return 0 - 16 - $index;
	247	}
	248	return false;
	249	}
	250
	251	}
	252
	253
	254	?>

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