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<?php
/* vim:set tabstop=8 softtabstop=8 shiftwidth=8 noexpandtab: */
// +----------------------------------------------------------------------+
// | 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 <info�getid3*org> |
// | Allan Hansen <ah�artemis*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 <jfaul�gmx*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;
}
}
?>
|
