ILIAS  release_5-1 Revision 5.0.0-5477-g43f3e3fab5f
module.audio.monkey.php
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1<?php
4// available at http://getid3.sourceforge.net //
5// or http://www.getid3.org //
7// See readme.txt for more details //
9// //
10// module.audio.monkey.php //
11// module for analyzing Monkey's Audio files //
12// dependencies: NONE //
13// ///
15
16
17class getid3_monkey
18{
19
20 function getid3_monkey(&$fd, &$ThisFileInfo) {
21 // based loosely on code from TMonkey by Jurgen Faul <jfaulØgmx*de>
22 // http://jfaul.de/atl or http://j-faul.virtualave.net/atl/atl.html
23
24 $ThisFileInfo['fileformat'] = 'mac';
25 $ThisFileInfo['audio']['dataformat'] = 'mac';
26 $ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
27 $ThisFileInfo['audio']['lossless'] = true;
28
29 $ThisFileInfo['monkeys_audio']['raw'] = array();
30 $thisfile_monkeysaudio = &$ThisFileInfo['monkeys_audio'];
31 $thisfile_monkeysaudio_raw = &$thisfile_monkeysaudio['raw'];
32
33 fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
34 $MACheaderData = fread($fd, 74);
35
36 $thisfile_monkeysaudio_raw['magic'] = substr($MACheaderData, 0, 4);
37 if ($thisfile_monkeysaudio_raw['magic'] != 'MAC ') {
38 $ThisFileInfo['error'][] = 'Expecting "MAC" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$thisfile_monkeysaudio_raw['magic'].'"';
39 unset($ThisFileInfo['fileformat']);
40 return false;
41 }
42 $thisfile_monkeysaudio_raw['nVersion'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, 4, 2)); // appears to be uint32 in 3.98+
43
44 if ($thisfile_monkeysaudio_raw['nVersion'] < 3980) {
45 $thisfile_monkeysaudio_raw['nCompressionLevel'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, 6, 2));
46 $thisfile_monkeysaudio_raw['nFormatFlags'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, 8, 2));
47 $thisfile_monkeysaudio_raw['nChannels'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, 10, 2));
48 $thisfile_monkeysaudio_raw['nSampleRate'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, 12, 4));
49 $thisfile_monkeysaudio_raw['nHeaderDataBytes'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, 16, 4));
50 $thisfile_monkeysaudio_raw['nWAVTerminatingBytes'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, 20, 4));
51 $thisfile_monkeysaudio_raw['nTotalFrames'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, 24, 4));
52 $thisfile_monkeysaudio_raw['nFinalFrameSamples'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, 28, 4));
53 $thisfile_monkeysaudio_raw['nPeakLevel'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, 32, 4));
54 $thisfile_monkeysaudio_raw['nSeekElements'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, 38, 2));
55 $offset = 8;
56 } else {
57 $offset = 8;
58 // APE_DESCRIPTOR
59 $thisfile_monkeysaudio_raw['nDescriptorBytes'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
60 $offset += 4;
61 $thisfile_monkeysaudio_raw['nHeaderBytes'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
62 $offset += 4;
63 $thisfile_monkeysaudio_raw['nSeekTableBytes'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
64 $offset += 4;
65 $thisfile_monkeysaudio_raw['nHeaderDataBytes'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
66 $offset += 4;
67 $thisfile_monkeysaudio_raw['nAPEFrameDataBytes'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
68 $offset += 4;
69 $thisfile_monkeysaudio_raw['nAPEFrameDataBytesHigh'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
70 $offset += 4;
71 $thisfile_monkeysaudio_raw['nTerminatingDataBytes'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
72 $offset += 4;
73 $thisfile_monkeysaudio_raw['cFileMD5'] = substr($MACheaderData, $offset, 16);
74 $offset += 16;
75
76 // APE_HEADER
77 $thisfile_monkeysaudio_raw['nCompressionLevel'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 2));
78 $offset += 2;
79 $thisfile_monkeysaudio_raw['nFormatFlags'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 2));
80 $offset += 2;
81 $thisfile_monkeysaudio_raw['nBlocksPerFrame'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
82 $offset += 4;
83 $thisfile_monkeysaudio_raw['nFinalFrameBlocks'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
84 $offset += 4;
85 $thisfile_monkeysaudio_raw['nTotalFrames'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
86 $offset += 4;
87 $thisfile_monkeysaudio_raw['nBitsPerSample'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 2));
88 $offset += 2;
89 $thisfile_monkeysaudio_raw['nChannels'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 2));
90 $offset += 2;
91 $thisfile_monkeysaudio_raw['nSampleRate'] = getid3_lib::LittleEndian2Int(substr($MACheaderData, $offset, 4));
92 $offset += 4;
93 }
94
95 $thisfile_monkeysaudio['flags']['8-bit'] = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0001);
96 $thisfile_monkeysaudio['flags']['crc-32'] = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0002);
97 $thisfile_monkeysaudio['flags']['peak_level'] = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0004);
98 $thisfile_monkeysaudio['flags']['24-bit'] = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0008);
99 $thisfile_monkeysaudio['flags']['seek_elements'] = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0010);
100 $thisfile_monkeysaudio['flags']['no_wav_header'] = (bool) ($thisfile_monkeysaudio_raw['nFormatFlags'] & 0x0020);
101 $thisfile_monkeysaudio['version'] = $thisfile_monkeysaudio_raw['nVersion'] / 1000;
102 $thisfile_monkeysaudio['compression'] = $this->MonkeyCompressionLevelNameLookup($thisfile_monkeysaudio_raw['nCompressionLevel']);
103 if ($thisfile_monkeysaudio_raw['nVersion'] < 3980) {
104 $thisfile_monkeysaudio['samples_per_frame'] = $this->MonkeySamplesPerFrame($thisfile_monkeysaudio_raw['nVersion'], $thisfile_monkeysaudio_raw['nCompressionLevel']);
105 }
106 $thisfile_monkeysaudio['bits_per_sample'] = ($thisfile_monkeysaudio['flags']['24-bit'] ? 24 : ($thisfile_monkeysaudio['flags']['8-bit'] ? 8 : 16));
107 $thisfile_monkeysaudio['channels'] = $thisfile_monkeysaudio_raw['nChannels'];
108 $ThisFileInfo['audio']['channels'] = $thisfile_monkeysaudio['channels'];
109 $thisfile_monkeysaudio['sample_rate'] = $thisfile_monkeysaudio_raw['nSampleRate'];
110 if ($thisfile_monkeysaudio['sample_rate'] == 0) {
111 $ThisFileInfo['error'][] = 'Corrupt MAC file: frequency == zero';
112 return false;
113 }
114 $ThisFileInfo['audio']['sample_rate'] = $thisfile_monkeysaudio['sample_rate'];
115 if ($thisfile_monkeysaudio['flags']['peak_level']) {
116 $thisfile_monkeysaudio['peak_level'] = $thisfile_monkeysaudio_raw['nPeakLevel'];
117 $thisfile_monkeysaudio['peak_ratio'] = $thisfile_monkeysaudio['peak_level'] / pow(2, $thisfile_monkeysaudio['bits_per_sample'] - 1);
118 }
119 if ($thisfile_monkeysaudio_raw['nVersion'] >= 3980) {
120 $thisfile_monkeysaudio['samples'] = (($thisfile_monkeysaudio_raw['nTotalFrames'] - 1) * $thisfile_monkeysaudio_raw['nBlocksPerFrame']) + $thisfile_monkeysaudio_raw['nFinalFrameBlocks'];
121 } else {
122 $thisfile_monkeysaudio['samples'] = (($thisfile_monkeysaudio_raw['nTotalFrames'] - 1) * $thisfile_monkeysaudio['samples_per_frame']) + $thisfile_monkeysaudio_raw['nFinalFrameSamples'];
123 }
124 $thisfile_monkeysaudio['playtime'] = $thisfile_monkeysaudio['samples'] / $thisfile_monkeysaudio['sample_rate'];
125 if ($thisfile_monkeysaudio['playtime'] == 0) {
126 $ThisFileInfo['error'][] = 'Corrupt MAC file: playtime == zero';
127 return false;
128 }
129 $ThisFileInfo['playtime_seconds'] = $thisfile_monkeysaudio['playtime'];
130 $thisfile_monkeysaudio['compressed_size'] = $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'];
131 $thisfile_monkeysaudio['uncompressed_size'] = $thisfile_monkeysaudio['samples'] * $thisfile_monkeysaudio['channels'] * ($thisfile_monkeysaudio['bits_per_sample'] / 8);
132 if ($thisfile_monkeysaudio['uncompressed_size'] == 0) {
133 $ThisFileInfo['error'][] = 'Corrupt MAC file: uncompressed_size == zero';
134 return false;
135 }
136 $thisfile_monkeysaudio['compression_ratio'] = $thisfile_monkeysaudio['compressed_size'] / ($thisfile_monkeysaudio['uncompressed_size'] + $thisfile_monkeysaudio_raw['nHeaderDataBytes']);
137 $thisfile_monkeysaudio['bitrate'] = (($thisfile_monkeysaudio['samples'] * $thisfile_monkeysaudio['channels'] * $thisfile_monkeysaudio['bits_per_sample']) / $thisfile_monkeysaudio['playtime']) * $thisfile_monkeysaudio['compression_ratio'];
138 $ThisFileInfo['audio']['bitrate'] = $thisfile_monkeysaudio['bitrate'];
139
140 // add size of MAC header to avdataoffset
141 if ($thisfile_monkeysaudio_raw['nVersion'] >= 3980) {
142 $ThisFileInfo['avdataoffset'] += $thisfile_monkeysaudio_raw['nDescriptorBytes'];
143 $ThisFileInfo['avdataoffset'] += $thisfile_monkeysaudio_raw['nHeaderBytes'];
144 $ThisFileInfo['avdataoffset'] += $thisfile_monkeysaudio_raw['nSeekTableBytes'];
145 $ThisFileInfo['avdataoffset'] += $thisfile_monkeysaudio_raw['nHeaderDataBytes'];
146
147 $ThisFileInfo['avdataend'] -= $thisfile_monkeysaudio_raw['nTerminatingDataBytes'];
148 } else {
149 $ThisFileInfo['avdataoffset'] += $offset;
150 }
151
152 if ($thisfile_monkeysaudio_raw['nVersion'] >= 3980) {
153 if ($thisfile_monkeysaudio_raw['cFileMD5'] === str_repeat("\x00", 16)) {
154 //$ThisFileInfo['warning'][] = 'cFileMD5 is null';
155 } else {
156 $ThisFileInfo['md5_data_source'] = '';
157 $md5 = $thisfile_monkeysaudio_raw['cFileMD5'];
158 for ($i = 0; $i < strlen($md5); $i++) {
159 $ThisFileInfo['md5_data_source'] .= str_pad(dechex(ord($md5{$i})), 2, '00', STR_PAD_LEFT);
160 }
161 if (!preg_match('/^[0-9a-f]{32}$/', $ThisFileInfo['md5_data_source'])) {
162 unset($ThisFileInfo['md5_data_source']);
163 }
164 }
165 }
166
167
168
169 $ThisFileInfo['audio']['bits_per_sample'] = $thisfile_monkeysaudio['bits_per_sample'];
170 $ThisFileInfo['audio']['encoder'] = 'MAC v'.number_format($thisfile_monkeysaudio['version'], 2);
171 $ThisFileInfo['audio']['encoder_options'] = ucfirst($thisfile_monkeysaudio['compression']).' compression';
172
173 return true;
174 }
175
176 function MonkeyCompressionLevelNameLookup($compressionlevel) {
177 static $MonkeyCompressionLevelNameLookup = array(
178 0 => 'unknown',
179 1000 => 'fast',
180 2000 => 'normal',
181 3000 => 'high',
182 4000 => 'extra-high',
183 5000 => 'insane'
184 );
185 return (isset($MonkeyCompressionLevelNameLookup[$compressionlevel]) ? $MonkeyCompressionLevelNameLookup[$compressionlevel] : 'invalid');
186 }
187
188 function MonkeySamplesPerFrame($versionid, $compressionlevel) {
189 if ($versionid >= 3950) {
190 return 73728 * 4;
191 } elseif ($versionid >= 3900) {
192 return 73728;
193 } elseif (($versionid >= 3800) && ($compressionlevel == 4000)) {
194 return 73728;
195 } else {
196 return 9216;
197 }
198 }
199
200}
201
202?>
getid3_handler\fseek
fseek($bytes, $whence=SEEK_SET)
Definition: getid3.php:1697
getid3_handler\fread
fread($bytes)
Definition: getid3.php:1685
getid3_lib\LittleEndian2Int
LittleEndian2Int($byteword, $signed=false)
Definition: getid3.lib.php:266
getid3_monkey
getID3() by James Heinrich info@getid3.org //
Definition: module.audio.monkey.php:18
getid3_monkey\getid3_monkey
getid3_monkey(&$fd, &$ThisFileInfo)
Definition: module.audio.monkey.php:20
getid3_monkey\MonkeyCompressionLevelNameLookup
MonkeyCompressionLevelNameLookup($compressionlevel)
Definition: module.audio.monkey.php:176
getid3_monkey\MonkeySamplesPerFrame
MonkeySamplesPerFrame($versionid, $compressionlevel)
Definition: module.audio.monkey.php:188