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<?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.tta.php //
// module for analyzing TTA Audio files //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////
class getid3_tta
{
function getid3_tta(&$fd, &$ThisFileInfo) {
$ThisFileInfo['fileformat'] = 'tta';
$ThisFileInfo['audio']['dataformat'] = 'tta';
$ThisFileInfo['audio']['lossless'] = true;
$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
$ttaheader = fread($fd, 26);
$ThisFileInfo['tta']['magic'] = substr($ttaheader, 0, 3);
if ($ThisFileInfo['tta']['magic'] != 'TTA') {
$ThisFileInfo['error'][] = 'Expecting "TTA" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$ThisFileInfo['tta']['magic'].'"';
unset($ThisFileInfo['fileformat']);
unset($ThisFileInfo['audio']);
unset($ThisFileInfo['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."
$ThisFileInfo['tta']['major_version'] = 1;
$ThisFileInfo['avdataoffset'] += 16;
$ThisFileInfo['tta']['compression_level'] = ord($ttaheader{3});
$ThisFileInfo['tta']['channels'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 4, 2));
$ThisFileInfo['tta']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 6, 2));
$ThisFileInfo['tta']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 8, 4));
$ThisFileInfo['tta']['samples_per_channel'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 12, 4));
$ThisFileInfo['audio']['encoder_options'] = '-e'.$ThisFileInfo['tta']['compression_level'];
$ThisFileInfo['playtime_seconds'] = $ThisFileInfo['tta']['samples_per_channel'] / $ThisFileInfo['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."
$ThisFileInfo['tta']['major_version'] = 2;
$ThisFileInfo['avdataoffset'] += 20;
$ThisFileInfo['tta']['compression_level'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 4, 2));
$ThisFileInfo['tta']['audio_format'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 6, 2));
$ThisFileInfo['tta']['channels'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 8, 2));
$ThisFileInfo['tta']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 10, 2));
$ThisFileInfo['tta']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 12, 4));
$ThisFileInfo['tta']['data_length'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 16, 4));
$ThisFileInfo['audio']['encoder_options'] = '-e'.$ThisFileInfo['tta']['compression_level'];
$ThisFileInfo['playtime_seconds'] = $ThisFileInfo['tta']['data_length'] / $ThisFileInfo['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."
$ThisFileInfo['tta']['major_version'] = 3;
$ThisFileInfo['avdataoffset'] += 26;
$ThisFileInfo['tta']['audio_format'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 4, 2)); // getid3_riff::RIFFwFormatTagLookup()
$ThisFileInfo['tta']['channels'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 6, 2));
$ThisFileInfo['tta']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 8, 2));
$ThisFileInfo['tta']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 10, 4));
$ThisFileInfo['tta']['data_length'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 14, 4));
$ThisFileInfo['tta']['crc32_footer'] = substr($ttaheader, 18, 4);
$ThisFileInfo['tta']['seek_point'] = getid3_lib::LittleEndian2Int(substr($ttaheader, 22, 4));
$ThisFileInfo['playtime_seconds'] = $ThisFileInfo['tta']['data_length'] / $ThisFileInfo['tta']['sample_rate'];
break;
default:
$ThisFileInfo['error'][] = 'This version of getID3() only knows how to handle TTA v1 and v2 - it may not work correctly with this file which appears to be TTA v'.$ttaheader{3};
return false;
break;
}
$ThisFileInfo['audio']['encoder'] = 'TTA v'.$ThisFileInfo['tta']['major_version'];
$ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['tta']['bits_per_sample'];
$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['tta']['sample_rate'];
$ThisFileInfo['audio']['channels'] = $ThisFileInfo['tta']['channels'];
$ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
return true;
}
}
?>
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