Show module.audio.mpc.php syntax highlighted
<?php
// +----------------------------------------------------------------------+
// | PHP version 5 |
// +----------------------------------------------------------------------+
// | Copyright (c) 2002-2004 James Heinrich |
// +----------------------------------------------------------------------+
// | 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.mpc.php |
// | Module for analyzing Musepack/MPEG+ Audio files |
// | dependencies: NONE |
// +----------------------------------------------------------------------+
//
// $Id: module.audio.mpc.php,v 1.2 2004/11/01 03:11:16 ah Exp $
class getid3_mpc extends getid3_handler
{
public function Analyze() {
$getid3 = $this->getid3;
// http://www.uni-jena.de/~pfk/mpp/sv8/header.html
$getid3->info['fileformat'] = 'mpc';
$getid3->info['audio']['dataformat'] = 'mpc';
$getid3->info['audio']['bitrate_mode'] = 'vbr';
$getid3->info['audio']['channels'] = 2; // the format appears to be hardcoded for stereo only
$getid3->info['audio']['lossless'] = false;
$getid3->info['mpc']['header'] = array ();
$info_mpc_header = &$getid3->info['mpc']['header'];
$info_mpc_header['size'] = 28;
$info_mpc_header['raw']['preamble'] = 'MP+'; // Magic bytes
fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
$mpc_header_data = fread($getid3->fp, 28);
$stream_version_byte = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 3, 1));
$info_mpc_header['stream_major_version'] = ($stream_version_byte & 0x0F);
$info_mpc_header['stream_minor_version'] = ($stream_version_byte & 0xF0) >> 4;
if ($info_mpc_header['stream_major_version'] != 7) {
throw new getid3_exception('Only Musepack SV7 supported');
}
$info_mpc_header['frame_count'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 4, 4));
$info_mpc_header['raw']['title_peak'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 12, 2));
$info_mpc_header['raw']['title_gain'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 14, 2), true);
$info_mpc_header['raw']['album_peak'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 16, 2));
$info_mpc_header['raw']['album_gain'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 18, 2), true);
$info_mpc_header['raw']['not_sure_what'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 24, 3));
$info_mpc_header['raw']['encoder_version'] = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 27, 1));
$flags_dword1 = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 8, 4));
$flags_dword2 = getid3_lib::LittleEndian2Int(substr($mpc_header_data, 20, 4));
$info_mpc_header['intensity_stereo'] = (bool)(($flags_dword1 & 0x80000000) >> 31);
$info_mpc_header['mid_side_stereo'] = (bool)(($flags_dword1 & 0x40000000) >> 30);
$info_mpc_header['max_subband'] = ($flags_dword1 & 0x3F000000) >> 24;
$info_mpc_header['raw']['profile'] = ($flags_dword1 & 0x00F00000) >> 20;
$info_mpc_header['begin_loud'] = (bool)(($flags_dword1 & 0x00080000) >> 19);
$info_mpc_header['end_loud'] = (bool)(($flags_dword1 & 0x00040000) >> 18);
$info_mpc_header['raw']['sample_rate'] = ($flags_dword1 & 0x00030000) >> 16;
$info_mpc_header['max_level'] = ($flags_dword1 & 0x0000FFFF);
$info_mpc_header['true_gapless'] = (bool)(($flags_dword2 & 0x80000000) >> 31);
$info_mpc_header['last_frame_length'] = ($flags_dword2 & 0x7FF00000) >> 20;
$info_mpc_header['profile'] = getid3_mpc::MPCprofileNameLookup($info_mpc_header['raw']['profile']);
$info_mpc_header['sample_rate'] = getid3_mpc::MPCfrequencyLookup($info_mpc_header['raw']['sample_rate']);
$getid3->info['audio']['sample_rate'] = $info_mpc_header['sample_rate'];
$info_mpc_header['samples'] = ((($info_mpc_header['frame_count'] - 1) * 1152) + $info_mpc_header['last_frame_length']) * $getid3->info['audio']['channels'];
$getid3->info['playtime_seconds'] = ($info_mpc_header['samples'] / $getid3->info['audio']['channels']) / $getid3->info['audio']['sample_rate'];
$getid3->info['avdataoffset'] += $info_mpc_header['size'];
$getid3->info['audio']['bitrate'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['playtime_seconds'];
$info_mpc_header['title_peak'] = $info_mpc_header['raw']['title_peak'];
$info_mpc_header['title_peak_db'] = getid3_mpc::MPCpeakDBLookup($info_mpc_header['title_peak']);
if ($info_mpc_header['raw']['title_gain'] < 0) {
$info_mpc_header['title_gain_db'] = (float)(32768 + $info_mpc_header['raw']['title_gain']) / -100;
}
else {
$info_mpc_header['title_gain_db'] = (float)$info_mpc_header['raw']['title_gain'] / 100;
}
$info_mpc_header['album_peak'] = $info_mpc_header['raw']['album_peak'];
$info_mpc_header['album_peak_db'] = getid3_mpc::MPCpeakDBLookup($info_mpc_header['album_peak']);
if ($info_mpc_header['raw']['album_gain'] < 0) {
$info_mpc_header['album_gain_db'] = (float)(32768 + $info_mpc_header['raw']['album_gain']) / -100;
}
else {
$info_mpc_header['album_gain_db'] = (float)$info_mpc_header['raw']['album_gain'] / 100;;
}
$info_mpc_header['encoder_version'] = getid3_mpc::MPCencoderVersionLookup($info_mpc_header['raw']['encoder_version']);
$getid3->info['replay_gain']['track']['adjustment'] = $info_mpc_header['title_gain_db'];
$getid3->info['replay_gain']['album']['adjustment'] = $info_mpc_header['album_gain_db'];
if ($info_mpc_header['title_peak'] > 0) {
$getid3->info['replay_gain']['track']['peak'] = $info_mpc_header['title_peak'];
}
elseif (round($info_mpc_header['max_level'] * 1.18) > 0) {
$getid3->info['replay_gain']['track']['peak'] = (int)(round($info_mpc_header['max_level'] * 1.18)); // why? I don't know - see mppdec.c
}
if ($info_mpc_header['album_peak'] > 0) {
$getid3->info['replay_gain']['album']['peak'] = $info_mpc_header['album_peak'];
}
$getid3->info['audio']['encoder'] = $info_mpc_header['encoder_version'];
$getid3->info['audio']['encoder_options'] = $info_mpc_header['profile'];
return true;
}
public static function MPCprofileNameLookup($profileid) {
static $lookup = array (
0 => 'no profile',
1 => 'Experimental',
2 => 'unused',
3 => 'unused',
4 => 'unused',
5 => 'below Telephone (q = 0.0)',
6 => 'below Telephone (q = 1.0)',
7 => 'Telephone (q = 2.0)',
8 => 'Thumb (q = 3.0)',
9 => 'Radio (q = 4.0)',
10 => 'Standard (q = 5.0)',
11 => 'Extreme (q = 6.0)',
12 => 'Insane (q = 7.0)',
13 => 'BrainDead (q = 8.0)',
14 => 'above BrainDead (q = 9.0)',
15 => 'above BrainDead (q = 10.0)'
);
return (isset($lookup[$profileid]) ? $lookup[$profileid] : 'invalid');
}
public static function MPCfrequencyLookup($frequencyid) {
static $lookup = array (
0 => 44100,
1 => 48000,
2 => 37800,
3 => 32000
);
return (isset($lookup[$frequencyid]) ? $lookup[$frequencyid] : 'invalid');
}
public static function MPCpeakDBLookup($int_value) {
if ($int_value > 0) {
return ((log10($int_value) / log10(2)) - 15) * 6;
}
return false;
}
public static function MPCencoderVersionLookup($encoder_version) {
//Encoder version * 100 (106 = 1.06)
//EncoderVersion % 10 == 0 Release (1.0)
//EncoderVersion % 2 == 0 Beta (1.06)
//EncoderVersion % 2 == 1 Alpha (1.05a...z)
if ($encoder_version == 0) {
// very old version, not known exactly which
return 'Buschmann v1.7.0-v1.7.9 or Klemm v0.90-v1.05';
}
if (($encoder_version % 10) == 0) {
// release version
return number_format($encoder_version / 100, 2);
} elseif (($encoder_version % 2) == 0) {
// beta version
return number_format($encoder_version / 100, 2).' beta';
}
// alpha version
return number_format($encoder_version / 100, 2).' alpha';
}
}
?>
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