diff options
Diffstat (limited to 'modules/getid3/module.audio.monkey.php')
-rw-r--r-- | modules/getid3/module.audio.monkey.php | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/modules/getid3/module.audio.monkey.php b/modules/getid3/module.audio.monkey.php new file mode 100644 index 00000000..4ea1d6fe --- /dev/null +++ b/modules/getid3/module.audio.monkey.php @@ -0,0 +1,216 @@ +<?php +// +----------------------------------------------------------------------+
+// | PHP version 5 |
+// +----------------------------------------------------------------------+
+// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
+// +----------------------------------------------------------------------+
+// | This source file is subject to version 2 of the GPL license, |
+// | that is bundled with this package in the file license.txt and is |
+// | available through the world-wide-web at the following url: |
+// | http://www.gnu.org/copyleft/gpl.html | +// +----------------------------------------------------------------------+ +// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org | +// +----------------------------------------------------------------------+
+// | Authors: James Heinrich <infoØgetid3*org> |
+// | Allan Hansen <ahØartemis*dk> |
+// +----------------------------------------------------------------------+ +// | module.audio.monkey.php | +// | Module for analyzing Monkey's Audio files | +// | dependencies: NONE | +// +----------------------------------------------------------------------+
+//
+// $Id: module.audio.monkey.php,v 1.2 2006/11/02 10:48:01 ah Exp $ + + + +class getid3_monkey extends getid3_handler +{ + + public function Analyze() { + + $getid3 = $this->getid3; + + // based loosely on code from TMonkey by Jurgen Faul <jfaulØgmx*de> + // http://jfaul.de/atl or http://j-faul.virtualave.net/atl/atl.html + + $getid3->info['fileformat'] = 'mac'; + $getid3->info['audio']['dataformat'] = 'mac'; + $getid3->info['audio']['bitrate_mode'] = 'vbr'; + $getid3->info['audio']['lossless'] = true; + + $getid3->info['monkeys_audio']['raw'] = array (); + $info_monkeys_audio = &$getid3->info['monkeys_audio']; + $info_monkeys_audio_raw = &$info_monkeys_audio['raw']; + + // Read file header + fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); + $mac_header_data = fread($getid3->fp, 74); + + $info_monkeys_audio_raw['magic'] = 'MAC '; // Magic bytes + + // Read MAC version + $info_monkeys_audio_raw['nVersion'] = getid3_lib::LittleEndian2Int(substr($mac_header_data, 4, 2)); // appears to be uint32 in 3.98+ + + // Parse MAC Header < v3980 + if ($info_monkeys_audio_raw['nVersion'] < 3980) { + + getid3_lib::ReadSequence("LittleEndian2Int", $info_monkeys_audio_raw, $mac_header_data, 6, + array (
+ 'nCompressionLevel' => 2,
+ 'nFormatFlags' => 2,
+ 'nChannels' => 2,
+ 'nSampleRate' => 4,
+ 'nHeaderDataBytes' => 4,
+ 'nWAVTerminatingBytes' => 4,
+ 'nTotalFrames' => 4,
+ 'nFinalFrameSamples' => 4,
+ 'nPeakLevel' => 4, + 'IGNORE-1' => 2,
+ 'nSeekElements' => 2 + ) + );
+ } + + // Parse MAC Header >= v3980 + else { + + getid3_lib::ReadSequence("LittleEndian2Int", $info_monkeys_audio_raw, $mac_header_data, 8, + array ( + // APE_DESCRIPTOR + 'nDescriptorBytes' => 4, + 'nHeaderBytes' => 4, + 'nSeekTableBytes' => 4, + 'nHeaderDataBytes' => 4, + 'nAPEFrameDataBytes' => 4, + 'nAPEFrameDataBytesHigh'=> 4, + 'nTerminatingDataBytes' => 4, + + // MD5 - string + 'cFileMD5' => -16, + + // APE_HEADER + 'nCompressionLevel' => 2, + 'nFormatFlags' => 2, + 'nBlocksPerFrame' => 4, + 'nFinalFrameBlocks' => 4, + 'nTotalFrames' => 4, + 'nBitsPerSample' => 2, + 'nChannels' => 2, + 'nSampleRate' => 4 + ) + ); + } + + // Process data + $info_monkeys_audio['flags']['8-bit'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0001); + $info_monkeys_audio['flags']['crc-32'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0002); + $info_monkeys_audio['flags']['peak_level'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0004); + $info_monkeys_audio['flags']['24-bit'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0008); + $info_monkeys_audio['flags']['seek_elements'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0010); + $info_monkeys_audio['flags']['no_wav_header'] = (bool)($info_monkeys_audio_raw['nFormatFlags'] & 0x0020); + + $info_monkeys_audio['version'] = $info_monkeys_audio_raw['nVersion'] / 1000; + + $info_monkeys_audio['compression'] = getid3_monkey::MonkeyCompressionLevelNameLookup($info_monkeys_audio_raw['nCompressionLevel']); + + $info_monkeys_audio['bits_per_sample'] = ($info_monkeys_audio['flags']['24-bit'] ? 24 : ($info_monkeys_audio['flags']['8-bit'] ? 8 : 16)); + + $info_monkeys_audio['channels'] = $info_monkeys_audio_raw['nChannels']; + + $getid3->info['audio']['channels'] = $info_monkeys_audio['channels']; + + $info_monkeys_audio['sample_rate'] = $info_monkeys_audio_raw['nSampleRate']; + + $getid3->info['audio']['sample_rate'] = $info_monkeys_audio['sample_rate']; + + if ($info_monkeys_audio['flags']['peak_level']) { + $info_monkeys_audio['peak_level'] = $info_monkeys_audio_raw['nPeakLevel']; + $info_monkeys_audio['peak_ratio'] = $info_monkeys_audio['peak_level'] / pow(2, $info_monkeys_audio['bits_per_sample'] - 1); + } + + // MAC >= v3980 + if ($info_monkeys_audio_raw['nVersion'] >= 3980) { + $info_monkeys_audio['samples'] = (($info_monkeys_audio_raw['nTotalFrames'] - 1) * $info_monkeys_audio_raw['nBlocksPerFrame']) + $info_monkeys_audio_raw['nFinalFrameBlocks']; + } + + // MAC < v3980 + else { + $info_monkeys_audio['samples_per_frame'] = getid3_monkey::MonkeySamplesPerFrame($info_monkeys_audio_raw['nVersion'], $info_monkeys_audio_raw['nCompressionLevel']); + $info_monkeys_audio['samples'] = (($info_monkeys_audio_raw['nTotalFrames'] - 1) * $info_monkeys_audio['samples_per_frame']) + $info_monkeys_audio_raw['nFinalFrameSamples']; + } + + $info_monkeys_audio['playtime'] = $info_monkeys_audio['samples'] / $info_monkeys_audio['sample_rate']; + + $getid3->info['playtime_seconds'] = $info_monkeys_audio['playtime']; + + $info_monkeys_audio['compressed_size'] = $getid3->info['avdataend'] - $getid3->info['avdataoffset']; + $info_monkeys_audio['uncompressed_size'] = $info_monkeys_audio['samples'] * $info_monkeys_audio['channels'] * ($info_monkeys_audio['bits_per_sample'] / 8); + $info_monkeys_audio['compression_ratio'] = $info_monkeys_audio['compressed_size'] / ($info_monkeys_audio['uncompressed_size'] + $info_monkeys_audio_raw['nHeaderDataBytes']); + $info_monkeys_audio['bitrate'] = (($info_monkeys_audio['samples'] * $info_monkeys_audio['channels'] * $info_monkeys_audio['bits_per_sample']) / $info_monkeys_audio['playtime']) * $info_monkeys_audio['compression_ratio']; + + $getid3->info['audio']['bitrate'] = $info_monkeys_audio['bitrate']; + + $getid3->info['audio']['bits_per_sample'] = $info_monkeys_audio['bits_per_sample']; + $getid3->info['audio']['encoder'] = 'MAC v'.number_format($info_monkeys_audio['version'], 2); + $getid3->info['audio']['encoder_options'] = ucfirst($info_monkeys_audio['compression']).' compression'; + + // MAC >= v3980 - get avdataoffsets from MAC header + if ($info_monkeys_audio_raw['nVersion'] >= 3980) { + $getid3->info['avdataoffset'] += $info_monkeys_audio_raw['nDescriptorBytes'] + $info_monkeys_audio_raw['nHeaderBytes'] + $info_monkeys_audio_raw['nSeekTableBytes'] + $info_monkeys_audio_raw['nHeaderDataBytes']; + $getid3->info['avdataend'] -= $info_monkeys_audio_raw['nTerminatingDataBytes']; + } + + // MAC < v3980 Add size of MAC header to avdataoffset + else { + $getid3->info['avdataoffset'] += 8; + } + + // Convert md5sum to 32 byte string + if (@$info_monkeys_audio_raw['cFileMD5']) { + if ($info_monkeys_audio_raw['cFileMD5'] !== str_repeat("\x00", 16)) { + $getid3->info['md5_data_source'] = ''; + $md5 = $info_monkeys_audio_raw['cFileMD5']; + for ($i = 0; $i < strlen($md5); $i++) { + $getid3->info['md5_data_source'] .= str_pad(dechex(ord($md5{$i})), 2, '00', STR_PAD_LEFT); + } + if (!preg_match('/^[0-9a-f]{32}$/', $getid3->info['md5_data_source'])) { + unset($getid3->info['md5_data_source']); + } + } + } + + + return true; + } + + + + public static function MonkeyCompressionLevelNameLookup($compression_level) { + + static $lookup = array ( + 0 => 'unknown', + 1000 => 'fast', + 2000 => 'normal', + 3000 => 'high', + 4000 => 'extra-high', + 5000 => 'insane' + ); + return (isset($lookup[$compression_level]) ? $lookup[$compression_level] : 'invalid'); + } + + + + public static function MonkeySamplesPerFrame($version_id, $compression_level) { + + if ($version_id >= 3950) { + return 73728 * 4; + } + if (($version_id >= 3900) || (($version_id >= 3800) && ($compression_level == 4000))) { + return 73728; + } + return 9216; + } + +} + +?>
\ No newline at end of file |