mirror of
https://github.com/Yetangitu/ampache
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125 lines
No EOL
6.1 KiB
PHP
125 lines
No EOL
6.1 KiB
PHP
<?php
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// +----------------------------------------------------------------------+
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// | PHP version 5 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 2 of the GPL license, |
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// | that is bundled with this package in the file license.txt and is |
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// | available through the world-wide-web at the following url: |
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// | http://www.gnu.org/copyleft/gpl.html |
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// +----------------------------------------------------------------------+
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// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
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// +----------------------------------------------------------------------+
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// | Authors: James Heinrich <infoØgetid3*org> |
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// | Allan Hansen <ahØartemis*dk> |
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// +----------------------------------------------------------------------+
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// | module.audio.tta.php |
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// | Module for analyzing TTA Audio files |
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// | dependencies: NONE |
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// +----------------------------------------------------------------------+
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//
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// $Id: module.audio.tta.php,v 1.2 2006/11/02 10:48:01 ah Exp $
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class getid3_tta extends getid3_handler
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{
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public function Analyze() {
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$getid3 = $this->getid3;
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$getid3->info['fileformat'] = 'tta';
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$getid3->info['audio']['dataformat'] = 'tta';
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$getid3->info['audio']['lossless'] = true;
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$getid3->info['audio']['bitrate_mode'] = 'vbr';
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fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
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$tta_header = fread($getid3->fp, 26);
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$getid3->info['tta']['magic'] = 'TTA'; // Magic bytes
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switch ($tta_header{3}) {
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case "\x01": // TTA v1.x
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case "\x02": // TTA v1.x
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case "\x03": // TTA v1.x
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// "It was the demo-version of the TTA encoder. There is no released format with such header. TTA encoder v1 is not supported about a year."
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$getid3->info['tta']['major_version'] = 1;
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$getid3->info['avdataoffset'] += 16;
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getid3_lib::ReadSequence('LittleEndian2Int', $getid3->info['tta'], $tta_header, 4,
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array (
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'channels' => 2,
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'bits_per_sample' => 2,
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'sample_rate' => 4,
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'samples_per_channel' => 4
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)
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);
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$getid3->info['tta']['compression_level'] = ord($tta_header{3});
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$getid3->info['audio']['encoder_options'] = '-e'.$getid3->info['tta']['compression_level'];
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$getid3->info['playtime_seconds'] = $getid3->info['tta']['samples_per_channel'] / $getid3->info['tta']['sample_rate'];
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break;
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case '2': // TTA v2.x
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// "I have hurried to release the TTA 2.0 encoder. Format documentation is removed from our site. This format still in development. Please wait the TTA2 format, encoder v4."
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$getid3->info['tta']['major_version'] = 2;
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$getid3->info['avdataoffset'] += 20;
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getid3_lib::ReadSequence('LittleEndian2Int', $getid3->info['tta'], $tta_header, 4,
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array (
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'compression_level' => 2,
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'audio_format' => 2,
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'channels' => 2,
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'bits_per_sample' => 2,
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'sample_rate' => 4,
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'data_length' => 4
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)
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);
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$getid3->info['audio']['encoder_options'] = '-e'.$getid3->info['tta']['compression_level'];
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$getid3->info['playtime_seconds'] = $getid3->info['tta']['data_length'] / $getid3->info['tta']['sample_rate'];
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break;
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case '1': // TTA v3.x
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// "This is a first stable release of the TTA format. It will be supported by the encoders v3 or higher."
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$getid3->info['tta']['major_version'] = 3;
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$getid3->info['avdataoffset'] += 26;
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getid3_lib::ReadSequence('LittleEndian2Int', $getid3->info['tta'], $tta_header, 4,
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array (
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'audio_format' => 2,
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'channels' => 2,
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'bits_per_sample'=> 2,
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'sample_rate' => 4,
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'data_length' => 4,
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'crc32_footer' => -4, // string
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'seek_point' => 4
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)
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);
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$getid3->info['playtime_seconds'] = $getid3->info['tta']['data_length'] / $getid3->info['tta']['sample_rate'];
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break;
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default:
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throw new getid3_exception('This version of getID3() only knows how to handle TTA v1, v2 and v3 - it may not work correctly with this file which appears to be TTA v'.$tta_header{3});
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return false;
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break;
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}
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$getid3->info['audio']['encoder'] = 'TTA v'.$getid3->info['tta']['major_version'];
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$getid3->info['audio']['bits_per_sample'] = $getid3->info['tta']['bits_per_sample'];
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$getid3->info['audio']['sample_rate'] = $getid3->info['tta']['sample_rate'];
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$getid3->info['audio']['channels'] = $getid3->info['tta']['channels'];
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$getid3->info['audio']['bitrate'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['playtime_seconds'];
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return true;
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}
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}
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?>
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