<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <[email protected]> //
// available at http://getid3.sourceforge.net //
// or http://www.getid3.org //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.audio.tta.php //
// module for analyzing TTA Audio files //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////
class getid3_tta extends getid3_handler
{
function Analyze() {
$info = &$this->getid3->info;
$info['fileformat'] = 'tta';
$info['audio']['dataformat'] = 'tta';
$info['audio']['lossless'] = true;
$info['audio']['bitrate_mode'] = 'vbr';
fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
$ttaheader = fread($this->getid3->fp, 26);
$info['tta']['magic'] = substr($ttaheader, 0, 3);
$magic = 'TTA';
if ($info['tta']['magic'] != $magic) {
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($info['tta']['magic']).'"';
unset($info['fileformat']);
unset($info['audio']);
unset($info['tta']);
return false;
}
switch ($ttaheader{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."
$info['tta']['major_version'] = 1;
$info['avdataoffset'] += 16;
$info['tta']['compression_level'] = ord($ttaheader{3});
$info['tta']['channels'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 4, 2));
$info['tta']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 6, 2));
$info['tta']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 8, 4));
$info['tta']['samples_per_channel'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 12, 4));
$info['audio']['encoder_options'] = '-e'.$info['tta']['compression_level'];
$info['playtime_seconds'] = $info['tta']['samples_per_channel'] / $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."
$info['tta']['major_version'] = 2;
$info['avdataoffset'] += 20;
$info['tta']['compression_level'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 4, 2));
$info['tta']['audio_format'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 6, 2));
$info['tta']['channels'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 8, 2));
$info['tta']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 10, 2));
$info['tta']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 12, 4));
$info['tta']['data_length'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 16, 4));
$info['audio']['encoder_options'] = '-e'.$info['tta']['compression_level'];
$info['playtime_seconds'] = $info['tta']['data_length'] / $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."
$info['tta']['major_version'] = 3;
$info['avdataoffset'] += 26;
$info['tta']['audio_format'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 4, 2)); // getid3_riff::RIFFwFormatTagLookup()
$info['tta']['channels'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 6, 2));
$info['tta']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 8, 2));
$info['tta']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 10, 4));
$info['tta']['data_length'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 14, 4));
$info['tta']['crc32_footer'] = substr($ttaheader, 18, 4);
$info['tta']['seek_point'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 22, 4));
$info['playtime_seconds'] = $info['tta']['data_length'] / $info['tta']['sample_rate'];
break;
default:
$info['error'][] = 'This version of getID3() ['.$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};
return false;
break;
}
$info['audio']['encoder'] = 'TTA v'.$info['tta']['major_version'];
$info['audio']['bits_per_sample'] = $info['tta']['bits_per_sample'];
$info['audio']['sample_rate'] = $info['tta']['sample_rate'];
$info['audio']['channels'] = $info['tta']['channels'];
$info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
return true;
}
}
?>
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