diff options
Diffstat (limited to 'getid3/module.audio.rkau.php')
| -rw-r--r-- | getid3/module.audio.rkau.php | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/getid3/module.audio.rkau.php b/getid3/module.audio.rkau.php new file mode 100644 index 0000000..0e344d4 --- /dev/null +++ b/getid3/module.audio.rkau.php @@ -0,0 +1,92 @@ +<?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.shorten.php // +// module for analyzing Shorten Audio files // +// dependencies: NONE // +// /// +///////////////////////////////////////////////////////////////// + + +class getid3_rkau +{ + + function getid3_rkau(&$fd, &$ThisFileInfo) { + + fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); + $RKAUHeader = fread($fd, 20); + if (substr($RKAUHeader, 0, 3) != 'RKA') { + $ThisFileInfo['error'][] = 'Expecting "RKA" at offset '.$ThisFileInfo['avdataoffset'].', found "'.substr($RKAUHeader, 0, 3).'"'; + return false; + } + + $ThisFileInfo['fileformat'] = 'rkau'; + $ThisFileInfo['audio']['dataformat'] = 'rkau'; + $ThisFileInfo['audio']['bitrate_mode'] = 'vbr'; + + $ThisFileInfo['rkau']['raw']['version'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 3, 1)); + $ThisFileInfo['rkau']['version'] = '1.'.str_pad($ThisFileInfo['rkau']['raw']['version'] & 0x0F, 2, '0', STR_PAD_LEFT); + if (($ThisFileInfo['rkau']['version'] > 1.07) || ($ThisFileInfo['rkau']['version'] < 1.06)) { + $ThisFileInfo['error'][] = 'This version of getID3() can only parse RKAU files v1.06 and 1.07 (this file is v'.$ThisFileInfo['rkau']['version'].')'; + unset($ThisFileInfo['rkau']); + return false; + } + + $ThisFileInfo['rkau']['source_bytes'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 4, 4)); + $ThisFileInfo['rkau']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 8, 4)); + $ThisFileInfo['rkau']['channels'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 12, 1)); + $ThisFileInfo['rkau']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 13, 1)); + + $ThisFileInfo['rkau']['raw']['quality'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 14, 1)); + $this->RKAUqualityLookup($ThisFileInfo['rkau']); + + $ThisFileInfo['rkau']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 15, 1)); + $ThisFileInfo['rkau']['flags']['joint_stereo'] = (bool) (!($ThisFileInfo['rkau']['raw']['flags'] & 0x01)); + $ThisFileInfo['rkau']['flags']['streaming'] = (bool) ($ThisFileInfo['rkau']['raw']['flags'] & 0x02); + $ThisFileInfo['rkau']['flags']['vrq_lossy_mode'] = (bool) ($ThisFileInfo['rkau']['raw']['flags'] & 0x04); + + if ($ThisFileInfo['rkau']['flags']['streaming']) { + $ThisFileInfo['avdataoffset'] += 20; + $ThisFileInfo['rkau']['compressed_bytes'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 16, 4)); + } else { + $ThisFileInfo['avdataoffset'] += 16; + $ThisFileInfo['rkau']['compressed_bytes'] = $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'] - 1; + } + // Note: compressed_bytes does not always equal what appears to be the actual number of compressed bytes, + // sometimes it's more, sometimes less. No idea why(?) + + $ThisFileInfo['audio']['lossless'] = $ThisFileInfo['rkau']['lossless']; + $ThisFileInfo['audio']['channels'] = $ThisFileInfo['rkau']['channels']; + $ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['rkau']['bits_per_sample']; + $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['rkau']['sample_rate']; + + $ThisFileInfo['playtime_seconds'] = $ThisFileInfo['rkau']['source_bytes'] / ($ThisFileInfo['rkau']['sample_rate'] * $ThisFileInfo['rkau']['channels'] * ($ThisFileInfo['rkau']['bits_per_sample'] / 8)); + $ThisFileInfo['audio']['bitrate'] = ($ThisFileInfo['rkau']['compressed_bytes'] * 8) / $ThisFileInfo['playtime_seconds']; + + return true; + + } + + + function RKAUqualityLookup(&$RKAUdata) { + $level = ($RKAUdata['raw']['quality'] & 0xF0) >> 4; + $quality = $RKAUdata['raw']['quality'] & 0x0F; + + $RKAUdata['lossless'] = (($quality == 0) ? true : false); + $RKAUdata['compression_level'] = $level + 1; + if (!$RKAUdata['lossless']) { + $RKAUdata['quality_setting'] = $quality; + } + + return true; + } + +} + +?>
\ No newline at end of file |