108 lines
5.3 KiB
PHP
108 lines
5.3 KiB
PHP
<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at http://getid3.sourceforge.net //
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// or http://www.getid3.org //
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// also https://github.com/JamesHeinrich/getID3 //
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/////////////////////////////////////////////////////////////////
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// See readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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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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class getid3_tta extends getid3_handler
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{
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public function Analyze() {
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$info = &$this->getid3->info;
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$info['fileformat'] = 'tta';
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$info['audio']['dataformat'] = 'tta';
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$info['audio']['lossless'] = true;
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$info['audio']['bitrate_mode'] = 'vbr';
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$this->fseek($info['avdataoffset']);
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$ttaheader = $this->fread(26);
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$info['tta']['magic'] = substr($ttaheader, 0, 3);
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$magic = 'TTA';
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if ($info['tta']['magic'] != $magic) {
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$this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['tta']['magic']).'"');
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unset($info['fileformat']);
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unset($info['audio']);
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unset($info['tta']);
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return false;
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}
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switch ($ttaheader{3}) {
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case "\x01": // TTA v1.x
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case "\x02": // TTA v1.x
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case "\x03": // TTA v1.x
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// "It was the demo-version of the TTA encoder. There is no released format with such header. TTA encoder v1 is not supported about a year."
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$info['tta']['major_version'] = 1;
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$info['avdataoffset'] += 16;
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$info['tta']['compression_level'] = ord($ttaheader{3});
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$info['tta']['channels'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 4, 2));
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$info['tta']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 6, 2));
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$info['tta']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 8, 4));
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$info['tta']['samples_per_channel'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 12, 4));
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$info['audio']['encoder_options'] = '-e'.$info['tta']['compression_level'];
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$info['playtime_seconds'] = $info['tta']['samples_per_channel'] / $info['tta']['sample_rate'];
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break;
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case '2': // TTA v2.x
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// "I have hurried to release the TTA 2.0 encoder. Format documentation is removed from our site. This format still in development. Please wait the TTA2 format, encoder v4."
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$info['tta']['major_version'] = 2;
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$info['avdataoffset'] += 20;
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$info['tta']['compression_level'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 4, 2));
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$info['tta']['audio_format'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 6, 2));
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$info['tta']['channels'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 8, 2));
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$info['tta']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 10, 2));
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$info['tta']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 12, 4));
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$info['tta']['data_length'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 16, 4));
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$info['audio']['encoder_options'] = '-e'.$info['tta']['compression_level'];
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$info['playtime_seconds'] = $info['tta']['data_length'] / $info['tta']['sample_rate'];
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break;
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case '1': // TTA v3.x
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// "This is a first stable release of the TTA format. It will be supported by the encoders v3 or higher."
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$info['tta']['major_version'] = 3;
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$info['avdataoffset'] += 26;
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$info['tta']['audio_format'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 4, 2)); // getid3_riff::wFormatTagLookup()
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$info['tta']['channels'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 6, 2));
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$info['tta']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 8, 2));
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$info['tta']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 10, 4));
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$info['tta']['data_length'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 14, 4));
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$info['tta']['crc32_footer'] = substr($ttaheader, 18, 4);
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$info['tta']['seek_point'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 22, 4));
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$info['playtime_seconds'] = $info['tta']['data_length'] / $info['tta']['sample_rate'];
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break;
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default:
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$this->error('This version of getID3() ['.$this->getid3->version().'] only knows how to handle TTA v1 and v2 - it may not work correctly with this file which appears to be TTA v'.$ttaheader{3});
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return false;
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break;
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}
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$info['audio']['encoder'] = 'TTA v'.$info['tta']['major_version'];
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$info['audio']['bits_per_sample'] = $info['tta']['bits_per_sample'];
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$info['audio']['sample_rate'] = $info['tta']['sample_rate'];
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$info['audio']['channels'] = $info['tta']['channels'];
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$info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
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return true;
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}
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}
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