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Diffstat (limited to 'modules/getid3/module.audio.tta.php')
| -rw-r--r-- | modules/getid3/module.audio.tta.php | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/modules/getid3/module.audio.tta.php b/modules/getid3/module.audio.tta.php new file mode 100644 index 00000000..80b2be82 --- /dev/null +++ b/modules/getid3/module.audio.tta.php @@ -0,0 +1,125 @@ +<?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.tta.php | +// | Module for analyzing TTA Audio files | +// | dependencies: NONE | +// +----------------------------------------------------------------------+
+//
+// $Id: module.audio.tta.php,v 1.2 2006/11/02 10:48:01 ah Exp $ + + + +class getid3_tta extends getid3_handler +{ + + public function Analyze() { + + $getid3 = $this->getid3; + + $getid3->info['fileformat'] = 'tta'; + $getid3->info['audio']['dataformat'] = 'tta'; + $getid3->info['audio']['lossless'] = true; + $getid3->info['audio']['bitrate_mode'] = 'vbr'; + + fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); + $tta_header = fread($getid3->fp, 26); + + $getid3->info['tta']['magic'] = 'TTA'; // Magic bytes + + switch ($tta_header{3}) { + + case "\x01": // TTA v1.x + case "\x02": // TTA v1.x + case "\x03": // TTA v1.x + + // "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." + $getid3->info['tta']['major_version'] = 1; + $getid3->info['avdataoffset'] += 16; + + getid3_lib::ReadSequence('LittleEndian2Int', $getid3->info['tta'], $tta_header, 4, + array ( + 'channels' => 2, + 'bits_per_sample' => 2, + 'sample_rate' => 4, + 'samples_per_channel' => 4 + ) + ); + $getid3->info['tta']['compression_level'] = ord($tta_header{3}); + + $getid3->info['audio']['encoder_options'] = '-e'.$getid3->info['tta']['compression_level']; + $getid3->info['playtime_seconds'] = $getid3->info['tta']['samples_per_channel'] / $getid3->info['tta']['sample_rate']; + break; + + case '2': // TTA v2.x + // "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." + $getid3->info['tta']['major_version'] = 2; + $getid3->info['avdataoffset'] += 20; + + getid3_lib::ReadSequence('LittleEndian2Int', $getid3->info['tta'], $tta_header, 4, + array ( + 'compression_level' => 2, + 'audio_format' => 2, + 'channels' => 2, + 'bits_per_sample' => 2, + 'sample_rate' => 4, + 'data_length' => 4 + ) + ); + + $getid3->info['audio']['encoder_options'] = '-e'.$getid3->info['tta']['compression_level']; + $getid3->info['playtime_seconds'] = $getid3->info['tta']['data_length'] / $getid3->info['tta']['sample_rate']; + break; + + case '1': // TTA v3.x + // "This is a first stable release of the TTA format. It will be supported by the encoders v3 or higher." + $getid3->info['tta']['major_version'] = 3; + $getid3->info['avdataoffset'] += 26; + + getid3_lib::ReadSequence('LittleEndian2Int', $getid3->info['tta'], $tta_header, 4, + array ( + 'audio_format' => 2, + 'channels' => 2, + 'bits_per_sample'=> 2, + 'sample_rate' => 4, + 'data_length' => 4, + 'crc32_footer' => -4, // string + 'seek_point' => 4 + ) + ); + + $getid3->info['playtime_seconds'] = $getid3->info['tta']['data_length'] / $getid3->info['tta']['sample_rate']; + break; + + default: + throw new getid3_exception('This version of getID3() only knows how to handle TTA v1, v2 and v3 - it may not work correctly with this file which appears to be TTA v'.$tta_header{3}); + return false; + break; + } + + $getid3->info['audio']['encoder'] = 'TTA v'.$getid3->info['tta']['major_version']; + $getid3->info['audio']['bits_per_sample'] = $getid3->info['tta']['bits_per_sample']; + $getid3->info['audio']['sample_rate'] = $getid3->info['tta']['sample_rate']; + $getid3->info['audio']['channels'] = $getid3->info['tta']['channels']; + $getid3->info['audio']['bitrate'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['playtime_seconds']; + + return true; + } + +} + + +?>
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