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<?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.monkey.php //
// module for analyzing Monkey's Audio files //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////
if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
exit;
}
class getid3_monkey extends getid3_handler
{
/**
* @return bool
*/
public function Analyze() {
$info = &$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'];
$this->fseek($info['avdataoffset']);
$MACheaderData = $this->fread(74);
$thisfile_monkeysaudio_raw['magic'] = substr($MACheaderData, 0, 4);
$magic = 'MAC ';
if ($thisfile_monkeysaudio_raw['magic'] != $magic) {
$this->error('Expecting "'.getid3_lib::PrintHexBytes($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) {
$this->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) {
$this->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) {
$this->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 ($thisfile_monkeysaudio_raw['cFileMD5'] === str_repeat("\x00", 16)) {
//$this->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;
}
/**
* @param int $compressionlevel
*
* @return string
*/
public function MonkeyCompressionLevelNameLookup($compressionlevel) {
static $MonkeyCompressionLevelNameLookup = array(
0 => 'unknown',
1000 => 'fast',
2000 => 'normal',
3000 => 'high',
4000 => 'extra-high',
5000 => 'insane'
);
return (isset($MonkeyCompressionLevelNameLookup[$compressionlevel]) ? $MonkeyCompressionLevelNameLookup[$compressionlevel] : 'invalid');
}
/**
* @param int $versionid
* @param int $compressionlevel
*
* @return int
*/
public function MonkeySamplesPerFrame($versionid, $compressionlevel) {
if ($versionid >= 3950) {
return 73728 * 4;
} elseif ($versionid >= 3900) {
return 73728;
} elseif (($versionid >= 3800) && ($compressionlevel == 4000)) {
return 73728;
} else {
return 9216;
}
}
}