name : module.audio.rkau.php <?php ///////////////////////////////////////////////////////////////// /// getID3() by James Heinrich <info@getid3.org> // // available at https://github.com/JamesHeinrich/getID3 // // or https://www.getid3.org // // or http://getid3.sourceforge.net // // see readme.txt for more details // ///////////////////////////////////////////////////////////////// // // // module.audio.shorten.php // // module for analyzing Shorten Audio files // // dependencies: NONE // // /// ///////////////////////////////////////////////////////////////// if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers exit; } class getid3_rkau extends getid3_handler { /** * @return bool */ public function Analyze() { $info = &$this->getid3->info; $this->fseek($info['avdataoffset']); $RKAUHeader = $this->fread(20); $magic = 'RKA'; if (substr($RKAUHeader, 0, 3) != $magic) { $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes(substr($RKAUHeader, 0, 3)).'"'); return false; } $info['fileformat'] = 'rkau'; $info['audio']['dataformat'] = 'rkau'; $info['audio']['bitrate_mode'] = 'vbr'; $info['rkau']['raw']['version'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 3, 1)); $info['rkau']['version'] = '1.'.str_pad($info['rkau']['raw']['version'] & 0x0F, 2, '0', STR_PAD_LEFT); if (($info['rkau']['version'] > 1.07) || ($info['rkau']['version'] < 1.06)) { $this->error('This version of getID3() ['.$this->getid3->version().'] can only parse RKAU files v1.06 and 1.07 (this file is v'.$info['rkau']['version'].')'); unset($info['rkau']); return false; } $info['rkau']['source_bytes'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 4, 4)); $info['rkau']['sample_rate'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 8, 4)); $info['rkau']['channels'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 12, 1)); $info['rkau']['bits_per_sample'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 13, 1)); $info['rkau']['raw']['quality'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 14, 1)); $this->RKAUqualityLookup($info['rkau']); $info['rkau']['raw']['flags'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 15, 1)); $info['rkau']['flags']['joint_stereo'] = !($info['rkau']['raw']['flags'] & 0x01); $info['rkau']['flags']['streaming'] = (bool) ($info['rkau']['raw']['flags'] & 0x02); $info['rkau']['flags']['vrq_lossy_mode'] = (bool) ($info['rkau']['raw']['flags'] & 0x04); if ($info['rkau']['flags']['streaming']) { $info['avdataoffset'] += 20; $info['rkau']['compressed_bytes'] = getid3_lib::LittleEndian2Int(substr($RKAUHeader, 16, 4)); } else { $info['avdataoffset'] += 16; $info['rkau']['compressed_bytes'] = $info['avdataend'] - $info['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(?) $info['audio']['lossless'] = $info['rkau']['lossless']; $info['audio']['channels'] = $info['rkau']['channels']; $info['audio']['bits_per_sample'] = $info['rkau']['bits_per_sample']; $info['audio']['sample_rate'] = $info['rkau']['sample_rate']; $info['playtime_seconds'] = $info['rkau']['source_bytes'] / ($info['rkau']['sample_rate'] * $info['rkau']['channels'] * ($info['rkau']['bits_per_sample'] / 8)); $info['audio']['bitrate'] = getid3_lib::SafeDiv($info['rkau']['compressed_bytes'] * 8, $info['playtime_seconds']); return true; } /** * @param array $RKAUdata * * @return bool */ public function RKAUqualityLookup(&$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; } }