[3318] | 1 | <?php |
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| 2 | // +----------------------------------------------------------------------+ |
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| 3 | // | PHP version 5 | |
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| 4 | // +----------------------------------------------------------------------+ |
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| 5 | // | Copyright (c) 2002-2006 James Heinrich, Allan Hansen | |
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| 6 | // +----------------------------------------------------------------------+ |
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| 7 | // | This source file is subject to version 2 of the GPL license, | |
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| 8 | // | that is bundled with this package in the file license.txt and is | |
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| 9 | // | available through the world-wide-web at the following url: | |
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| 10 | // | http://www.gnu.org/copyleft/gpl.html | |
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| 11 | // +----------------------------------------------------------------------+ |
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| 12 | // | getID3() - http://getid3.sourceforge.net or http://www.getid3.org | |
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| 13 | // +----------------------------------------------------------------------+ |
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| 14 | // | Authors: James Heinrich <infoØgetid3*org> | |
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| 15 | // | Allan Hansen <ahØartemis*dk> | |
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| 16 | // +----------------------------------------------------------------------+ |
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| 17 | // | module.audio.monkey.php | |
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| 18 | // | Module for analyzing Monkey's Audio files | |
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| 19 | // | dependencies: NONE | |
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| 20 | // +----------------------------------------------------------------------+ |
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| 21 | // |
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| 22 | // $Id: module.audio.monkey.php 3318 2009-05-20 21:54:10Z vdigital $ |
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| 23 | |
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| 24 | |
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| 25 | |
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| 26 | class getid3_monkey extends getid3_handler |
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| 27 | { |
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| 28 | |
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| 29 | public function Analyze() { |
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| 30 | |
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| 31 | $getid3 = $this->getid3; |
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| 32 | |
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| 33 | // based loosely on code from TMonkey by Jurgen Faul <jfaulØgmx*de> |
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| 34 | // http://jfaul.de/atl or http://j-faul.virtualave.net/atl/atl.html |
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| 35 | |
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| 36 | $getid3->info['fileformat'] = 'mac'; |
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| 37 | $getid3->info['audio']['dataformat'] = 'mac'; |
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| 38 | $getid3->info['audio']['bitrate_mode'] = 'vbr'; |
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| 39 | $getid3->info['audio']['lossless'] = true; |
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| 40 | |
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| 41 | $getid3->info['monkeys_audio']['raw'] = array (); |
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| 42 | $info_monkeys_audio = &$getid3->info['monkeys_audio']; |
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| 43 | $info_monkeys_audio_raw = &$info_monkeys_audio['raw']; |
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| 44 | |
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| 45 | // Read file header |
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| 46 | fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); |
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| 47 | $mac_header_data = fread($getid3->fp, 74); |
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| 48 | |
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| 49 | $info_monkeys_audio_raw['magic'] = 'MAC '; // Magic bytes |
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| 50 | |
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| 51 | // Read MAC version |
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| 52 | $info_monkeys_audio_raw['nVersion'] = getid3_lib::LittleEndian2Int(substr($mac_header_data, 4, 2)); // appears to be uint32 in 3.98+ |
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| 53 | |
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| 54 | // Parse MAC Header < v3980 |
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| 55 | if ($info_monkeys_audio_raw['nVersion'] < 3980) { |
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| 56 | |
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| 57 | getid3_lib::ReadSequence("LittleEndian2Int", $info_monkeys_audio_raw, $mac_header_data, 6, |
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| 58 | array ( |
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| 59 | 'nCompressionLevel' => 2, |
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| 60 | 'nFormatFlags' => 2, |
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| 61 | 'nChannels' => 2, |
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| 62 | 'nSampleRate' => 4, |
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| 63 | 'nHeaderDataBytes' => 4, |
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| 64 | 'nWAVTerminatingBytes' => 4, |
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| 65 | 'nTotalFrames' => 4, |
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| 66 | 'nFinalFrameSamples' => 4, |
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| 67 | 'nPeakLevel' => 4, |
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| 68 | 'IGNORE-1' => 2, |
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| 69 | 'nSeekElements' => 2 |
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| 70 | ) |
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| 71 | ); |
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| 72 | } |
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| 73 | |
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| 74 | // Parse MAC Header >= v3980 |
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| 75 | else { |
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| 76 | |
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| 77 | getid3_lib::ReadSequence("LittleEndian2Int", $info_monkeys_audio_raw, $mac_header_data, 8, |
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| 78 | array ( |
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| 79 | // APE_DESCRIPTOR |
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| 80 | 'nDescriptorBytes' => 4, |
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| 81 | 'nHeaderBytes' => 4, |
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| 82 | 'nSeekTableBytes' => 4, |
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| 83 | 'nHeaderDataBytes' => 4, |
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| 84 | 'nAPEFrameDataBytes' => 4, |
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| 85 | 'nAPEFrameDataBytesHigh'=> 4, |
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| 86 | 'nTerminatingDataBytes' => 4, |
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| 87 | |
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| 88 | // MD5 - string |
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| 89 | 'cFileMD5' => -16, |
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| 90 | |
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| 91 | // APE_HEADER |
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| 92 | 'nCompressionLevel' => 2, |
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| 93 | 'nFormatFlags' => 2, |
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| 94 | 'nBlocksPerFrame' => 4, |
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| 95 | 'nFinalFrameBlocks' => 4, |
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| 96 | 'nTotalFrames' => 4, |
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| 97 | 'nBitsPerSample' => 2, |
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| 98 | 'nChannels' => 2, |
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| 99 | 'nSampleRate' => 4 |
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| 100 | ) |
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| 101 | ); |
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| 102 | } |
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| 103 | |
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| 104 | // Process data |
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| 105 | $info_monkeys_audio['flags']['8-bit'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0001); |
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| 106 | $info_monkeys_audio['flags']['crc-32'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0002); |
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| 107 | $info_monkeys_audio['flags']['peak_level'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0004); |
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| 108 | $info_monkeys_audio['flags']['24-bit'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0008); |
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| 109 | $info_monkeys_audio['flags']['seek_elements'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0010); |
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| 110 | $info_monkeys_audio['flags']['no_wav_header'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0020); |
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| 111 | |
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| 112 | $info_monkeys_audio['version'] = $info_monkeys_audio_raw['nVersion'] / 1000; |
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| 113 | |
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| 114 | $info_monkeys_audio['compression'] = getid3_monkey::MonkeyCompressionLevelNameLookup($info_monkeys_audio_raw['nCompressionLevel']); |
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| 115 | |
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| 116 | $info_monkeys_audio['bits_per_sample'] = ($info_monkeys_audio['flags']['24-bit'] ? 24 : ($info_monkeys_audio['flags']['8-bit'] ? 8 : 16)); |
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| 117 | |
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| 118 | $info_monkeys_audio['channels'] = $info_monkeys_audio_raw['nChannels']; |
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| 119 | |
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| 120 | $getid3->info['audio']['channels'] = $info_monkeys_audio['channels']; |
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| 121 | |
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| 122 | $info_monkeys_audio['sample_rate'] = $info_monkeys_audio_raw['nSampleRate']; |
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| 123 | |
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| 124 | $getid3->info['audio']['sample_rate'] = $info_monkeys_audio['sample_rate']; |
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| 125 | |
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| 126 | if ($info_monkeys_audio['flags']['peak_level']) { |
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| 127 | $info_monkeys_audio['peak_level'] = $info_monkeys_audio_raw['nPeakLevel']; |
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| 128 | $info_monkeys_audio['peak_ratio'] = $info_monkeys_audio['peak_level'] / pow(2, $info_monkeys_audio['bits_per_sample'] - 1); |
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| 129 | } |
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| 130 | |
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| 131 | // MAC >= v3980 |
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| 132 | if ($info_monkeys_audio_raw['nVersion'] >= 3980) { |
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| 133 | $info_monkeys_audio['samples'] = (($info_monkeys_audio_raw['nTotalFrames'] - 1) * $info_monkeys_audio_raw['nBlocksPerFrame']) + $info_monkeys_audio_raw['nFinalFrameBlocks']; |
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| 134 | } |
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| 135 | |
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| 136 | // MAC < v3980 |
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| 137 | else { |
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| 138 | $info_monkeys_audio['samples_per_frame'] = getid3_monkey::MonkeySamplesPerFrame($info_monkeys_audio_raw['nVersion'], $info_monkeys_audio_raw['nCompressionLevel']); |
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| 139 | $info_monkeys_audio['samples'] = (($info_monkeys_audio_raw['nTotalFrames'] - 1) * $info_monkeys_audio['samples_per_frame']) + $info_monkeys_audio_raw['nFinalFrameSamples']; |
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| 140 | } |
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| 141 | |
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| 142 | $info_monkeys_audio['playtime'] = $info_monkeys_audio['samples'] / $info_monkeys_audio['sample_rate']; |
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| 143 | |
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| 144 | $getid3->info['playtime_seconds'] = $info_monkeys_audio['playtime']; |
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| 145 | |
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| 146 | $info_monkeys_audio['compressed_size'] = $getid3->info['avdataend'] - $getid3->info['avdataoffset']; |
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| 147 | $info_monkeys_audio['uncompressed_size'] = $info_monkeys_audio['samples'] * $info_monkeys_audio['channels'] * ($info_monkeys_audio['bits_per_sample'] / 8); |
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| 148 | $info_monkeys_audio['compression_ratio'] = $info_monkeys_audio['compressed_size'] / ($info_monkeys_audio['uncompressed_size'] + $info_monkeys_audio_raw['nHeaderDataBytes']); |
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| 149 | $info_monkeys_audio['bitrate'] = (($info_monkeys_audio['samples'] * $info_monkeys_audio['channels'] * $info_monkeys_audio['bits_per_sample']) / $info_monkeys_audio['playtime']) * $info_monkeys_audio['compression_ratio']; |
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| 150 | |
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| 151 | $getid3->info['audio']['bitrate'] = $info_monkeys_audio['bitrate']; |
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| 152 | |
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| 153 | $getid3->info['audio']['bits_per_sample'] = $info_monkeys_audio['bits_per_sample']; |
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| 154 | $getid3->info['audio']['encoder'] = 'MAC v'.number_format($info_monkeys_audio['version'], 2); |
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| 155 | $getid3->info['audio']['encoder_options'] = ucfirst($info_monkeys_audio['compression']).' compression'; |
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| 156 | |
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| 157 | // MAC >= v3980 - get avdataoffsets from MAC header |
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| 158 | if ($info_monkeys_audio_raw['nVersion'] >= 3980) { |
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| 159 | $getid3->info['avdataoffset'] += $info_monkeys_audio_raw['nDescriptorBytes'] + $info_monkeys_audio_raw['nHeaderBytes'] + $info_monkeys_audio_raw['nSeekTableBytes'] + $info_monkeys_audio_raw['nHeaderDataBytes']; |
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| 160 | $getid3->info['avdataend'] -= $info_monkeys_audio_raw['nTerminatingDataBytes']; |
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| 161 | } |
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| 162 | |
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| 163 | // MAC < v3980 Add size of MAC header to avdataoffset |
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| 164 | else { |
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| 165 | $getid3->info['avdataoffset'] += 8; |
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| 166 | } |
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| 167 | |
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| 168 | // Convert md5sum to 32 byte string |
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| 169 | if (@$info_monkeys_audio_raw['cFileMD5']) { |
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| 170 | if ($info_monkeys_audio_raw['cFileMD5'] !== str_repeat("\x00", 16)) { |
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| 171 | $getid3->info['md5_data_source'] = ''; |
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| 172 | $md5 = $info_monkeys_audio_raw['cFileMD5']; |
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| 173 | for ($i = 0; $i < strlen($md5); $i++) { |
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| 174 | $getid3->info['md5_data_source'] .= str_pad(dechex(ord($md5{$i})), 2, '00', STR_PAD_LEFT); |
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| 175 | } |
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| 176 | if (!preg_match('/^[0-9a-f]{32}$/', $getid3->info['md5_data_source'])) { |
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| 177 | unset($getid3->info['md5_data_source']); |
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| 178 | } |
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| 179 | } |
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| 180 | } |
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| 181 | |
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| 182 | |
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| 183 | return true; |
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| 184 | } |
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| 185 | |
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| 186 | |
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| 187 | |
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| 188 | public static function MonkeyCompressionLevelNameLookup($compression_level) { |
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| 189 | |
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| 190 | static $lookup = array ( |
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| 191 | 0 => 'unknown', |
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| 192 | 1000 => 'fast', |
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| 193 | 2000 => 'normal', |
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| 194 | 3000 => 'high', |
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| 195 | 4000 => 'extra-high', |
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| 196 | 5000 => 'insane' |
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| 197 | ); |
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| 198 | return (isset($lookup[$compression_level]) ? $lookup[$compression_level] : 'invalid'); |
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| 199 | } |
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| 200 | |
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| 201 | |
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| 202 | |
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| 203 | public static function MonkeySamplesPerFrame($version_id, $compression_level) { |
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| 204 | |
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| 205 | if ($version_id >= 3950) { |
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| 206 | return 73728 * 4; |
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| 207 | } |
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| 208 | if (($version_id >= 3900) || (($version_id >= 3800) && ($compression_level == 4000))) { |
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| 209 | return 73728; |
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| 210 | } |
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| 211 | return 9216; |
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| 212 | } |
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| 213 | |
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| 214 | } |
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| 215 | |
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| 216 | ?> |
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