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authorAlib <aliboba@free.fr>2010-03-15 17:56:22 +0100
committerAlib <aliboba@free.fr>2010-03-15 17:56:22 +0100
commit438912c0c4a4075a5cd74cf9689451c9df4bbe34 (patch)
tree334e03bbba01b002a34d3cbf81ee7e600ec7bff6 /getid3/module.audio.lpac.php
parenta8012963c23e7e5eaf487ee9e192ae5c4d4ccff2 (diff)
downloadistreamdev-438912c0c4a4075a5cd74cf9689451c9df4bbe34.tar.gz
istreamdev-438912c0c4a4075a5cd74cf9689451c9df4bbe34.tar.bz2
New Jquery branch. Initial development version for istreamdev 1.0
Diffstat (limited to 'getid3/module.audio.lpac.php')
-rw-r--r--getid3/module.audio.lpac.php126
1 files changed, 0 insertions, 126 deletions
diff --git a/getid3/module.audio.lpac.php b/getid3/module.audio.lpac.php
deleted file mode 100644
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--- a/getid3/module.audio.lpac.php
+++ /dev/null
@@ -1,126 +0,0 @@
-<?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.lpac.php //
-// module for analyzing LPAC Audio files //
-// dependencies: module.audio-video.riff.php //
-// ///
-/////////////////////////////////////////////////////////////////
-
-getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio-video.riff.php', __FILE__, true);
-
-class getid3_lpac
-{
-
- function getid3_lpac(&$fd, &$ThisFileInfo) {
-
- fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
- $LPACheader = fread($fd, 14);
- if (substr($LPACheader, 0, 4) != 'LPAC') {
- $ThisFileInfo['error'][] = 'Expected "LPAC" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$StreamMarker.'"';
- return false;
- }
- $ThisFileInfo['avdataoffset'] += 14;
-
- $ThisFileInfo['fileformat'] = 'lpac';
- $ThisFileInfo['audio']['dataformat'] = 'lpac';
- $ThisFileInfo['audio']['lossless'] = true;
- $ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
-
- $ThisFileInfo['lpac']['file_version'] = getid3_lib::BigEndian2Int(substr($LPACheader, 4, 1));
- $flags['audio_type'] = getid3_lib::BigEndian2Int(substr($LPACheader, 5, 1));
- $ThisFileInfo['lpac']['total_samples']= getid3_lib::BigEndian2Int(substr($LPACheader, 6, 4));
- $flags['parameters'] = getid3_lib::BigEndian2Int(substr($LPACheader, 10, 4));
-
- $ThisFileInfo['lpac']['flags']['is_wave'] = (bool) ($flags['audio_type'] & 0x40);
- $ThisFileInfo['lpac']['flags']['stereo'] = (bool) ($flags['audio_type'] & 0x04);
- $ThisFileInfo['lpac']['flags']['24_bit'] = (bool) ($flags['audio_type'] & 0x02);
- $ThisFileInfo['lpac']['flags']['16_bit'] = (bool) ($flags['audio_type'] & 0x01);
-
- if ($ThisFileInfo['lpac']['flags']['24_bit'] && $ThisFileInfo['lpac']['flags']['16_bit']) {
- $ThisFileInfo['warning'][] = '24-bit and 16-bit flags cannot both be set';
- }
-
- $ThisFileInfo['lpac']['flags']['fast_compress'] = (bool) ($flags['parameters'] & 0x40000000);
- $ThisFileInfo['lpac']['flags']['random_access'] = (bool) ($flags['parameters'] & 0x08000000);
- $ThisFileInfo['lpac']['block_length'] = pow(2, (($flags['parameters'] & 0x07000000) >> 24)) * 256;
- $ThisFileInfo['lpac']['flags']['adaptive_prediction_order'] = (bool) ($flags['parameters'] & 0x00800000);
- $ThisFileInfo['lpac']['flags']['adaptive_quantization'] = (bool) ($flags['parameters'] & 0x00400000);
- $ThisFileInfo['lpac']['flags']['joint_stereo'] = (bool) ($flags['parameters'] & 0x00040000);
- $ThisFileInfo['lpac']['quantization'] = ($flags['parameters'] & 0x00001F00) >> 8;
- $ThisFileInfo['lpac']['max_prediction_order'] = ($flags['parameters'] & 0x0000003F);
-
- if ($ThisFileInfo['lpac']['flags']['fast_compress'] && ($ThisFileInfo['lpac']['max_prediction_order'] != 3)) {
- $ThisFileInfo['warning'][] = 'max_prediction_order expected to be "3" if fast_compress is true, actual value is "'.$ThisFileInfo['lpac']['max_prediction_order'].'"';
- }
- switch ($ThisFileInfo['lpac']['file_version']) {
- case 6:
- if ($ThisFileInfo['lpac']['flags']['adaptive_quantization']) {
- $ThisFileInfo['warning'][] = 'adaptive_quantization expected to be false in LPAC file stucture v6, actually true';
- }
- if ($ThisFileInfo['lpac']['quantization'] != 20) {
- $ThisFileInfo['warning'][] = 'Quantization expected to be 20 in LPAC file stucture v6, actually '.$ThisFileInfo['lpac']['flags']['Q'];
- }
- break;
-
- default:
- //$ThisFileInfo['warning'][] = 'This version of getID3() only supports LPAC file format version 6, this file is version '.$ThisFileInfo['lpac']['file_version'].' - please report to info@getid3.org';
- break;
- }
-
- $dummy = $ThisFileInfo;
- $riff = new getid3_riff($fd, $dummy);
- unset($riff);
- $ThisFileInfo['avdataoffset'] = $dummy['avdataoffset'];
- $ThisFileInfo['riff'] = $dummy['riff'];
- $ThisFileInfo['error'] = $dummy['error'];
- $ThisFileInfo['warning'] = $dummy['warning'];
- $ThisFileInfo['lpac']['comments']['comment'] = $dummy['comments'];
- $ThisFileInfo['audio']['sample_rate'] = $dummy['audio']['sample_rate'];
-
- $ThisFileInfo['audio']['channels'] = ($ThisFileInfo['lpac']['flags']['stereo'] ? 2 : 1);
-
- if ($ThisFileInfo['lpac']['flags']['24_bit']) {
- $ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['riff']['audio'][0]['bits_per_sample'];
- } elseif ($ThisFileInfo['lpac']['flags']['16_bit']) {
- $ThisFileInfo['audio']['bits_per_sample'] = 16;
- } else {
- $ThisFileInfo['audio']['bits_per_sample'] = 8;
- }
-
- if ($ThisFileInfo['lpac']['flags']['fast_compress']) {
- // fast
- $ThisFileInfo['audio']['encoder_options'] = '-1';
- } else {
- switch ($ThisFileInfo['lpac']['max_prediction_order']) {
- case 20: // simple
- $ThisFileInfo['audio']['encoder_options'] = '-2';
- break;
- case 30: // medium
- $ThisFileInfo['audio']['encoder_options'] = '-3';
- break;
- case 40: // high
- $ThisFileInfo['audio']['encoder_options'] = '-4';
- break;
- case 60: // extrahigh
- $ThisFileInfo['audio']['encoder_options'] = '-5';
- break;
- }
- }
-
- $ThisFileInfo['playtime_seconds'] = $ThisFileInfo['lpac']['total_samples'] / $ThisFileInfo['audio']['sample_rate'];
- $ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
-
- return true;
- }
-
-}
-
-
-?> \ No newline at end of file