<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at http://getid3.sourceforge.net ///
// or http://www.getid3.org ///
/////////////////////////////////////////////////////////////////
// //
// getid3.mpc.php - part of getID3() //
// See getid3.readme.txt for more details //
// //
/////////////////////////////////////////////////////////////////
function getMPCHeaderFilepointer(&$fd, &$ThisFileInfo) {
// http://www.uni-jena.de/~pfk/mpp/sv8/header.html
$ThisFileInfo['fileformat'] = 'mpc';
$ThisFileInfo['audio']['dataformat'] = 'mpc';
$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
$ThisFileInfo['audio']['channels'] = 2; // the format appears to be hardcoded for stereo only
$ThisFileInfo['audio']['bits_per_sample'] = 16; // maybe not entirely accurate, but a value is needed here for compression_ratio calculations
$ThisFileInfo['audio']['lossless'] = false;
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
$ThisFileInfo['mpc']['header']['size'] = 30;
$MPCheaderData = fread($fd, $ThisFileInfo['mpc']['header']['size']);
$offset = 0;
$ThisFileInfo['mpc']['header']['raw']['preamble'] = substr($MPCheaderData, $offset, 3); // should be 'MP+'
$offset += 3;
if ($ThisFileInfo['mpc']['header']['raw']['preamble'] != 'MP+') {
$ThisFileInfo['error'] .= "\n".'Expecting "MP+" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$ThisFileInfo['mpc']['header']['raw']['preamble'].'"';
unset($ThisFileInfo['fileformat']);
unset($ThisFileInfo['mpc']);
return false;
}
$StreamVersionByte = LittleEndian2Int(substr($MPCheaderData, $offset, 1));
$offset += 1;
$ThisFileInfo['mpc']['header']['stream_major_version'] = ($StreamVersionByte & 0x0F);
$ThisFileInfo['mpc']['header']['stream_minor_version'] = ($StreamVersionByte & 0xF0) >> 4;
$ThisFileInfo['mpc']['header']['frame_count'] = LittleEndian2Int(substr($MPCheaderData, $offset, 4));
$offset += 4;
switch ($ThisFileInfo['mpc']['header']['stream_major_version']) {
case 7:
//$ThisFileInfo['fileformat'] = 'SV7';
break;
default:
$ThisFileInfo['error'] .= "\n".'Only MPEGplus/Musepack SV7 supported';
return false;
}
$FlagsByte1 = LittleEndian2Int(substr($MPCheaderData, $offset, 4));
$offset += 4;
$ThisFileInfo['mpc']['header']['intensity_stereo'] = (bool) (($FlagsByte1 & 0x80000000) >> 31);
$ThisFileInfo['mpc']['header']['mid_side_stereo'] = (bool) (($FlagsByte1 & 0x40000000) >> 30);
$ThisFileInfo['mpc']['header']['max_subband'] = ($FlagsByte1 & 0x3F000000) >> 24;
$ThisFileInfo['mpc']['header']['raw']['profile'] = ($FlagsByte1 & 0x00F00000) >> 20;
$ThisFileInfo['mpc']['header']['begin_loud'] = (bool) (($FlagsByte1 & 0x00080000) >> 19);
$ThisFileInfo['mpc']['header']['end_loud'] = (bool) (($FlagsByte1 & 0x00040000) >> 18);
$ThisFileInfo['mpc']['header']['raw']['sample_rate'] = ($FlagsByte1 & 0x00030000) >> 16;
$ThisFileInfo['mpc']['header']['max_level'] = ($FlagsByte1 & 0x0000FFFF);
$ThisFileInfo['mpc']['header']['raw']['title_peak'] = LittleEndian2Int(substr($MPCheaderData, $offset, 2));
$offset += 2;
$ThisFileInfo['mpc']['header']['raw']['title_gain'] = LittleEndian2Int(substr($MPCheaderData, $offset, 2), true);
$offset += 2;
$ThisFileInfo['mpc']['header']['raw']['album_peak'] = LittleEndian2Int(substr($MPCheaderData, $offset, 2));
$offset += 2;
$ThisFileInfo['mpc']['header']['raw']['album_gain'] = LittleEndian2Int(substr($MPCheaderData, $offset, 2), true);
$offset += 2;
$FlagsByte2 = LittleEndian2Int(substr($MPCheaderData, $offset, 4));
$offset += 4;
$ThisFileInfo['mpc']['header']['true_gapless'] = (bool) (($FlagsByte2 & 0x80000000) >> 31);
$ThisFileInfo['mpc']['header']['last_frame_length'] = ($FlagsByte2 & 0x7FF00000) >> 20;
$offset += 3; // unused?
$ThisFileInfo['mpc']['header']['raw']['encoder_version'] = LittleEndian2Int(substr($MPCheaderData, $offset, 1));
$offset += 1;
$ThisFileInfo['mpc']['header']['profile'] = MPCprofileNameLookup($ThisFileInfo['mpc']['header']['raw']['profile']);
$ThisFileInfo['mpc']['header']['sample_rate'] = MPCfrequencyLookup($ThisFileInfo['mpc']['header']['raw']['sample_rate']);
if ($ThisFileInfo['mpc']['header']['sample_rate'] == 0) {
$ThisFileInfo['error'] .= "\n".'Corrupt MPC file: frequency == zero';
return false;
}
$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpc']['header']['sample_rate'];
$ThisFileInfo['mpc']['header']['samples'] = ((($ThisFileInfo['mpc']['header']['frame_count'] - 1) * 1152) + $ThisFileInfo['mpc']['header']['last_frame_length']) * $ThisFileInfo['audio']['channels'];
$ThisFileInfo['playtime_seconds'] = ($ThisFileInfo['mpc']['header']['samples'] / $ThisFileInfo['audio']['channels']) / $ThisFileInfo['audio']['sample_rate'];
if ($ThisFileInfo['playtime_seconds'] == 0) {
$ThisFileInfo['error'] .= "\n".'Corrupt MPC file: playtime_seconds == zero';
return false;
}
// add size of file header to avdataoffset - calc bitrate correctly + MD5 data
$ThisFileInfo['avdataoffset'] += $ThisFileInfo['mpc']['header']['size'];
$ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
$ThisFileInfo['mpc']['header']['title_peak'] = $ThisFileInfo['mpc']['header']['raw']['title_peak'];
$ThisFileInfo['mpc']['header']['title_peak_db'] = MPCpeakDBLookup($ThisFileInfo['mpc']['header']['title_peak']);
$ThisFileInfo['mpc']['header']['title_gain_db'] = $ThisFileInfo['mpc']['header']['raw']['title_gain'] / 100;
$ThisFileInfo['mpc']['header']['album_peak'] = $ThisFileInfo['mpc']['header']['raw']['album_peak'];
$ThisFileInfo['mpc']['header']['album_peak_db'] = MPCpeakDBLookup($ThisFileInfo['mpc']['header']['album_peak']);
$ThisFileInfo['mpc']['header']['album_gain_db'] = $ThisFileInfo['mpc']['header']['raw']['album_gain'] / 100;;
$ThisFileInfo['mpc']['header']['encoder_version'] = MPCencoderVersionLookup($ThisFileInfo['mpc']['header']['raw']['encoder_version']);
if ($ThisFileInfo['mpc']['header']['title_peak_db']) {
$ThisFileInfo['replay_gain']['radio']['peak'] = $ThisFileInfo['mpc']['header']['title_peak'];
$ThisFileInfo['replay_gain']['radio']['adjustment'] = $ThisFileInfo['mpc']['header']['title_gain_db'];
} else {
$ThisFileInfo['replay_gain']['radio']['peak'] = CastAsInt(round($ThisFileInfo['mpc']['header']['max_level'] * 1.18)); // why? I don't know - see mppdec.c
$ThisFileInfo['replay_gain']['radio']['adjustment'] = 0;
}
if ($ThisFileInfo['mpc']['header']['album_peak_db']) {
$ThisFileInfo['replay_gain']['audiophile']['peak'] = $ThisFileInfo['mpc']['header']['album_peak'];
$ThisFileInfo['replay_gain']['audiophile']['adjustment'] = $ThisFileInfo['mpc']['header']['album_gain_db'];
}
$ThisFileInfo['audio']['encoder'] = $ThisFileInfo['mpc']['header']['encoder_version'].', SV'.$ThisFileInfo['mpc']['header']['stream_major_version'].'.'.$ThisFileInfo['mpc']['header']['stream_minor_version'];
return true;
}
function MPCprofileNameLookup($profileid) {
static $MPCprofileNameLookup = array();
if (empty($MPCprofileNameLookup)) {
$MPCprofileNameLookup[0] = 'no profile';
$MPCprofileNameLookup[1] = 'Experimental';
$MPCprofileNameLookup[2] = 'unused';
$MPCprofileNameLookup[3] = 'unused';
$MPCprofileNameLookup[4] = 'unused';
$MPCprofileNameLookup[5] = 'below Telephone (q = 0.0)';
$MPCprofileNameLookup[6] = 'below Telephone (q = 1.0)';
$MPCprofileNameLookup[7] = 'Telephone (q = 2.0)';
$MPCprofileNameLookup[8] = 'Thumb (q = 3.0)';
$MPCprofileNameLookup[9] = 'Radio (q = 4.0)';
$MPCprofileNameLookup[10] = 'Standard (q = 5.0)';
$MPCprofileNameLookup[11] = 'Extreme (q = 6.0)';
$MPCprofileNameLookup[12] = 'Insane (q = 7.0)';
$MPCprofileNameLookup[13] = 'BrainDead (q = 8.0)';
$MPCprofileNameLookup[14] = 'above BrainDead (q = 9.0)';
$MPCprofileNameLookup[15] = 'above BrainDead (q = 10.0)';
}
return (isset($MPCprofileNameLookup[$profileid]) ? $MPCprofileNameLookup[$profileid] : 'invalid');
}
function MPCfrequencyLookup($frequencyid) {
static $MPCfrequencyLookup = array();
if (empty($MPCfrequencyLookup)) {
$MPCfrequencyLookup[0] = 44100;
$MPCfrequencyLookup[1] = 48000;
$MPCfrequencyLookup[2] = 37800;
$MPCfrequencyLookup[3] = 32000;
}
return (isset($MPCfrequencyLookup[$frequencyid]) ? $MPCfrequencyLookup[$frequencyid] : 'invalid');
}
function MPCpeakDBLookup($intvalue) {
if ($intvalue > 0) {
return ((log10($intvalue) / log10(2)) - 15) * 6;
}
return false;
}
function MPCencoderVersionLookup($encoderversion) {
//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 (($encoderversion % 10) == 0) {
// release version
return number_format($encoderversion / 100, 2);
} elseif (($encoderversion % 2) == 0) {
// beta version
return number_format($encoderversion / 100, 2).' beta';
} else {
// alpha version
return number_format($encoderversion / 100, 2).' alpha';
}
}
?>