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sources/3rdparty/getid3/module.audio.monkey.php 11.3 KB
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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.monkey.php                                     //
  // module for analyzing Monkey's Audio files                   //
  // dependencies: NONE                                          //
  //                                                            ///
  /////////////////////////////////////////////////////////////////
  
  
  class getid3_monkey extends getid3_handler
  {
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  	public function Analyze() {
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  		$info = &$this->getid3->info;
  
  		// based loosely on code from TMonkey by Jurgen Faul <jfaulØgmx*de>
  		// http://jfaul.de/atl  or  http://j-faul.virtualave.net/atl/atl.html
  
  		$info['fileformat']            = 'mac';
  		$info['audio']['dataformat']   = 'mac';
  		$info['audio']['bitrate_mode'] = 'vbr';
  		$info['audio']['lossless']     = true;
  
  		$info['monkeys_audio']['raw'] = array();
  		$thisfile_monkeysaudio                = &$info['monkeys_audio'];
  		$thisfile_monkeysaudio_raw            = &$thisfile_monkeysaudio['raw'];
  
  		fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
  		$MACheaderData = fread($this->getid3->fp, 74);
  
  		$thisfile_monkeysaudio_raw['magic'] = substr($MACheaderData, 0, 4);
  		$magic = 'MAC ';
  		if ($thisfile_monkeysaudio_raw['magic'] != $magic) {
  			$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($thisfile_monkeysaudio_raw['magic']).'"';
  			unset($info['fileformat']);
  			return false;
  		}
  		$thisfile_monkeysaudio_raw['nVersion']             = getid3_lib::LittleEndian2Int(substr($MACheaderData, 4, 2)); // appears to be uint32 in 3.98+
  
  		if ($thisfile_monkeysaudio_raw['nVersion'] < 3980) {
  			$thisfile_monkeysaudio_raw['nCompressionLevel']    = getid3_lib::LittleEndian2Int(substr($MACheaderData, 6, 2));
  			$thisfile_monkeysaudio_raw['nFormatFlags']         = getid3_lib::LittleEndian2Int(substr($MACheaderData, 8, 2));
  			$thisfile_monkeysaudio_raw['nChannels']            = getid3_lib::LittleEndian2Int(substr($MACheaderData, 10, 2));
  			$thisfile_monkeysaudio_raw['nSampleRate']          = getid3_lib::LittleEndian2Int(substr($MACheaderData, 12, 4));
  			$thisfile_monkeysaudio_raw['nHeaderDataBytes']     = getid3_lib::LittleEndian2Int(substr($MACheaderData, 16, 4));
  			$thisfile_monkeysaudio_raw['nWAVTerminatingBytes'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, 20, 4));
  			$thisfile_monkeysaudio_raw['nTotalFrames']         = getid3_lib::LittleEndian2Int(substr($MACheaderData, 24, 4));
  			$thisfile_monkeysaudio_raw['nFinalFrameSamples']   = getid3_lib::LittleEndian2Int(substr($MACheaderData, 28, 4));
  			$thisfile_monkeysaudio_raw['nPeakLevel']           = getid3_lib::LittleEndian2Int(substr($MACheaderData, 32, 4));
  			$thisfile_monkeysaudio_raw['nSeekElements']        = getid3_lib::LittleEndian2Int(substr($MACheaderData, 38, 2));
  			$offset = 8;
  		} else {
  			$offset = 8;
  			// APE_DESCRIPTOR
  			$thisfile_monkeysaudio_raw['nDescriptorBytes']       = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset,  4));
  			$offset += 4;
  			$thisfile_monkeysaudio_raw['nHeaderBytes']           = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset,  4));
  			$offset += 4;
  			$thisfile_monkeysaudio_raw['nSeekTableBytes']        = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset,  4));
  			$offset += 4;
  			$thisfile_monkeysaudio_raw['nHeaderDataBytes']       = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset,  4));
  			$offset += 4;
  			$thisfile_monkeysaudio_raw['nAPEFrameDataBytes']     = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset,  4));
  			$offset += 4;
  			$thisfile_monkeysaudio_raw['nAPEFrameDataBytesHigh'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset,  4));
  			$offset += 4;
  			$thisfile_monkeysaudio_raw['nTerminatingDataBytes']  = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset,  4));
  			$offset += 4;
  			$thisfile_monkeysaudio_raw['cFileMD5']               =                              substr($MACheaderData, $offset, 16);
  			$offset += 16;
  
  			// APE_HEADER
  			$thisfile_monkeysaudio_raw['nCompressionLevel']    = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 2));
  			$offset += 2;
  			$thisfile_monkeysaudio_raw['nFormatFlags']         = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 2));
  			$offset += 2;
  			$thisfile_monkeysaudio_raw['nBlocksPerFrame']      = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
  			$offset += 4;
  			$thisfile_monkeysaudio_raw['nFinalFrameBlocks']    = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
  			$offset += 4;
  			$thisfile_monkeysaudio_raw['nTotalFrames']         = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
  			$offset += 4;
  			$thisfile_monkeysaudio_raw['nBitsPerSample']       = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 2));
  			$offset += 2;
  			$thisfile_monkeysaudio_raw['nChannels']            = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 2));
  			$offset += 2;
  			$thisfile_monkeysaudio_raw['nSampleRate']          = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
  			$offset += 4;
  		}
  
  		$thisfile_monkeysaudio['flags']['8-bit']         = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0001);
  		$thisfile_monkeysaudio['flags']['crc-32']        = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0002);
  		$thisfile_monkeysaudio['flags']['peak_level']    = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0004);
  		$thisfile_monkeysaudio['flags']['24-bit']        = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0008);
  		$thisfile_monkeysaudio['flags']['seek_elements'] = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0010);
  		$thisfile_monkeysaudio['flags']['no_wav_header'] = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0020);
  		$thisfile_monkeysaudio['version']                = $thisfile_monkeysaudio_raw['nVersion'] / 1000;
  		$thisfile_monkeysaudio['compression']            = $this->MonkeyCompressionLevelNameLookup($thisfile_monkeysaudio_raw['nCompressionLevel']);
  		if ($thisfile_monkeysaudio_raw['nVersion'] < 3980) {
  			$thisfile_monkeysaudio['samples_per_frame']      = $this->MonkeySamplesPerFrame($thisfile_monkeysaudio_raw['nVersion'], $thisfile_monkeysaudio_raw['nCompressionLevel']);
  		}
  		$thisfile_monkeysaudio['bits_per_sample']        = ($thisfile_monkeysaudio['flags']['24-bit'] ? 24 : ($thisfile_monkeysaudio['flags']['8-bit'] ? 8 : 16));
  		$thisfile_monkeysaudio['channels']               = $thisfile_monkeysaudio_raw['nChannels'];
  		$info['audio']['channels']               = $thisfile_monkeysaudio['channels'];
  		$thisfile_monkeysaudio['sample_rate']            = $thisfile_monkeysaudio_raw['nSampleRate'];
  		if ($thisfile_monkeysaudio['sample_rate'] == 0) {
  			$info['error'][] = 'Corrupt MAC file: frequency == zero';
  			return false;
  		}
  		$info['audio']['sample_rate']            = $thisfile_monkeysaudio['sample_rate'];
  		if ($thisfile_monkeysaudio['flags']['peak_level']) {
  			$thisfile_monkeysaudio['peak_level']         = $thisfile_monkeysaudio_raw['nPeakLevel'];
  			$thisfile_monkeysaudio['peak_ratio']         = $thisfile_monkeysaudio['peak_level'] / pow(2, $thisfile_monkeysaudio['bits_per_sample'] - 1);
  		}
  		if ($thisfile_monkeysaudio_raw['nVersion'] >= 3980) {
  			$thisfile_monkeysaudio['samples']            = (($thisfile_monkeysaudio_raw['nTotalFrames'] - 1) * $thisfile_monkeysaudio_raw['nBlocksPerFrame']) + $thisfile_monkeysaudio_raw['nFinalFrameBlocks'];
  		} else {
  			$thisfile_monkeysaudio['samples']            = (($thisfile_monkeysaudio_raw['nTotalFrames'] - 1) * $thisfile_monkeysaudio['samples_per_frame']) + $thisfile_monkeysaudio_raw['nFinalFrameSamples'];
  		}
  		$thisfile_monkeysaudio['playtime']               = $thisfile_monkeysaudio['samples'] / $thisfile_monkeysaudio['sample_rate'];
  		if ($thisfile_monkeysaudio['playtime'] == 0) {
  			$info['error'][] = 'Corrupt MAC file: playtime == zero';
  			return false;
  		}
  		$info['playtime_seconds']                = $thisfile_monkeysaudio['playtime'];
  		$thisfile_monkeysaudio['compressed_size']        = $info['avdataend'] - $info['avdataoffset'];
  		$thisfile_monkeysaudio['uncompressed_size']      = $thisfile_monkeysaudio['samples'] * $thisfile_monkeysaudio['channels'] * ($thisfile_monkeysaudio['bits_per_sample'] / 8);
  		if ($thisfile_monkeysaudio['uncompressed_size'] == 0) {
  			$info['error'][] = 'Corrupt MAC file: uncompressed_size == zero';
  			return false;
  		}
  		$thisfile_monkeysaudio['compression_ratio']      = $thisfile_monkeysaudio['compressed_size'] / ($thisfile_monkeysaudio['uncompressed_size'] + $thisfile_monkeysaudio_raw['nHeaderDataBytes']);
  		$thisfile_monkeysaudio['bitrate']                = (($thisfile_monkeysaudio['samples'] * $thisfile_monkeysaudio['channels'] * $thisfile_monkeysaudio['bits_per_sample']) / $thisfile_monkeysaudio['playtime']) * $thisfile_monkeysaudio['compression_ratio'];
  		$info['audio']['bitrate']                = $thisfile_monkeysaudio['bitrate'];
  
  		// add size of MAC header to avdataoffset
  		if ($thisfile_monkeysaudio_raw['nVersion'] >= 3980) {
  			$info['avdataoffset'] += $thisfile_monkeysaudio_raw['nDescriptorBytes'];
  			$info['avdataoffset'] += $thisfile_monkeysaudio_raw['nHeaderBytes'];
  			$info['avdataoffset'] += $thisfile_monkeysaudio_raw['nSeekTableBytes'];
  			$info['avdataoffset'] += $thisfile_monkeysaudio_raw['nHeaderDataBytes'];
  
  			$info['avdataend'] -= $thisfile_monkeysaudio_raw['nTerminatingDataBytes'];
  		} else {
  			$info['avdataoffset'] += $offset;
  		}
  
  		if ($thisfile_monkeysaudio_raw['nVersion'] >= 3980) {
  			if ($thisfile_monkeysaudio_raw['cFileMD5'] === str_repeat("\x00", 16)) {
  				//$info['warning'][] = 'cFileMD5 is null';
  			} else {
  				$info['md5_data_source'] = '';
  				$md5 = $thisfile_monkeysaudio_raw['cFileMD5'];
  				for ($i = 0; $i < strlen($md5); $i++) {
  					$info['md5_data_source'] .= str_pad(dechex(ord($md5{$i})), 2, '00', STR_PAD_LEFT);
  				}
  				if (!preg_match('/^[0-9a-f]{32}$/', $info['md5_data_source'])) {
  					unset($info['md5_data_source']);
  				}
  			}
  		}
  
  
  
  		$info['audio']['bits_per_sample'] = $thisfile_monkeysaudio['bits_per_sample'];
  		$info['audio']['encoder']         = 'MAC v'.number_format($thisfile_monkeysaudio['version'], 2);
  		$info['audio']['encoder_options'] = ucfirst($thisfile_monkeysaudio['compression']).' compression';
  
  		return true;
  	}
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  	public function MonkeyCompressionLevelNameLookup($compressionlevel) {
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  		static $MonkeyCompressionLevelNameLookup = array(
  			0     => 'unknown',
  			1000  => 'fast',
  			2000  => 'normal',
  			3000  => 'high',
  			4000  => 'extra-high',
  			5000  => 'insane'
  		);
  		return (isset($MonkeyCompressionLevelNameLookup[$compressionlevel]) ? $MonkeyCompressionLevelNameLookup[$compressionlevel] : 'invalid');
  	}
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  	public function MonkeySamplesPerFrame($versionid, $compressionlevel) {
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  		if ($versionid >= 3950) {
  			return 73728 * 4;
  		} elseif ($versionid >= 3900) {
  			return 73728;
  		} elseif (($versionid >= 3800) && ($compressionlevel == 4000)) {
  			return 73728;
  		} else {
  			return 9216;
  		}
  	}
  
  }