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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
- {
- function getid3_monkey(&$fd, &$ThisFileInfo) {
- // based loosely on code from TMonkey by Jurgen Faul <jfaulØgmx*de>
- // http://jfaul.de/atl or http://j-faul.virtualave.net/atl/atl.html
- $ThisFileInfo['fileformat'] = 'mac';
- $ThisFileInfo['audio']['dataformat'] = 'mac';
- $ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
- $ThisFileInfo['audio']['lossless'] = true;
- $ThisFileInfo['monkeys_audio']['raw'] = array();
- $thisfile_monkeysaudio = &$ThisFileInfo['monkeys_audio'];
- $thisfile_monkeysaudio_raw = &$thisfile_monkeysaudio['raw'];
- fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
- $MACheaderData = fread($fd, 74);
- $thisfile_monkeysaudio_raw['magic'] = substr($MACheaderData, 0, 4);
- if ($thisfile_monkeysaudio_raw['magic'] != 'MAC ') {
- $ThisFileInfo['error'][] = 'Expecting "MAC" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$thisfile_monkeysaudio_raw['magic'].'"';
- unset($ThisFileInfo['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'];
- $ThisFileInfo['audio']['channels'] = $thisfile_monkeysaudio['channels'];
- $thisfile_monkeysaudio['sample_rate'] = $thisfile_monkeysaudio_raw['nSampleRate'];
- if ($thisfile_monkeysaudio['sample_rate'] == 0) {
- $ThisFileInfo['error'][] = 'Corrupt MAC file: frequency == zero';
- return false;
- }
- $ThisFileInfo['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) {
- $ThisFileInfo['error'][] = 'Corrupt MAC file: playtime == zero';
- return false;
- }
- $ThisFileInfo['playtime_seconds'] = $thisfile_monkeysaudio['playtime'];
- $thisfile_monkeysaudio['compressed_size'] = $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'];
- $thisfile_monkeysaudio['uncompressed_size'] = $thisfile_monkeysaudio['samples'] * $thisfile_monkeysaudio['channels'] * ($thisfile_monkeysaudio['bits_per_sample'] / 8);
- if ($thisfile_monkeysaudio['uncompressed_size'] == 0) {
- $ThisFileInfo['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'];
- $ThisFileInfo['audio']['bitrate'] = $thisfile_monkeysaudio['bitrate'];
- // add size of MAC header to avdataoffset
- if ($thisfile_monkeysaudio_raw['nVersion'] >= 3980) {
- $ThisFileInfo['avdataoffset'] += $thisfile_monkeysaudio_raw['nDescriptorBytes'];
- $ThisFileInfo['avdataoffset'] += $thisfile_monkeysaudio_raw['nHeaderBytes'];
- $ThisFileInfo['avdataoffset'] += $thisfile_monkeysaudio_raw['nSeekTableBytes'];
- $ThisFileInfo['avdataoffset'] += $thisfile_monkeysaudio_raw['nHeaderDataBytes'];
- $ThisFileInfo['avdataend'] -= $thisfile_monkeysaudio_raw['nTerminatingDataBytes'];
- } else {
- $ThisFileInfo['avdataoffset'] += $offset;
- }
- if ($thisfile_monkeysaudio_raw['nVersion'] >= 3980) {
- if ($thisfile_monkeysaudio_raw['cFileMD5'] === str_repeat("\x00", 16)) {
- //$ThisFileInfo['warning'][] = 'cFileMD5 is null';
- } else {
- $ThisFileInfo['md5_data_source'] = '';
- $md5 = $thisfile_monkeysaudio_raw['cFileMD5'];
- for ($i = 0; $i < strlen($md5); $i++) {
- $ThisFileInfo['md5_data_source'] .= str_pad(dechex(ord($md5{$i})), 2, '00', STR_PAD_LEFT);
- }
- if (!preg_match('/^[0-9a-f]{32}$/', $ThisFileInfo['md5_data_source'])) {
- unset($ThisFileInfo['md5_data_source']);
- }
- }
- }
- $ThisFileInfo['audio']['bits_per_sample'] = $thisfile_monkeysaudio['bits_per_sample'];
- $ThisFileInfo['audio']['encoder'] = 'MAC v'.number_format($thisfile_monkeysaudio['version'], 2);
- $ThisFileInfo['audio']['encoder_options'] = ucfirst($thisfile_monkeysaudio['compression']).' compression';
- return true;
- }
- 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');
- }
- 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;
- }
- }
- }
- ?>
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