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- <?php
- /////////////////////////////////////////////////////////////////
- /// getID3() by James Heinrich <info@getid3.org> //
- // available at http://getid3.sourceforge.net //
- // or http://www.getid3.org //
- /////////////////////////////////////////////////////////////////
- // See readme.txt for more details //
- /////////////////////////////////////////////////////////////////
- // //
- // module.audio.mpc.php //
- // module for analyzing Musepack/MPEG+ Audio files //
- // dependencies: NONE //
- // ///
- /////////////////////////////////////////////////////////////////
- class getid3_mpc
- {
- function getid3_mpc(&$fd, &$ThisFileInfo) {
- $ThisFileInfo['mpc']['header'] = array();
- $thisfile_mpc_header = &$ThisFileInfo['mpc']['header'];
- $ThisFileInfo['fileformat'] = 'mpc';
- $ThisFileInfo['audio']['dataformat'] = 'mpc';
- $ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
- $ThisFileInfo['audio']['channels'] = 2; // up to SV7 the format appears to have been hardcoded for stereo only
- $ThisFileInfo['audio']['lossless'] = false;
- fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
- $MPCheaderData = fread($fd, 4);
- $ThisFileInfo['mpc']['header']['preamble'] = substr($MPCheaderData, 0, 4); // should be 'MPCK' (SV8) or 'MP+' (SV7), otherwise possible stream data (SV4-SV6)
- if (ereg('^MPCK', $ThisFileInfo['mpc']['header']['preamble'])) {
- // this is SV8
- return $this->ParseMPCsv8($fd, $ThisFileInfo);
- } elseif (ereg('^MP\+', $ThisFileInfo['mpc']['header']['preamble'])) {
- // this is SV7
- return $this->ParseMPCsv7($fd, $ThisFileInfo);
- } elseif (preg_match('/^[\x00\x01\x10\x11\x40\x41\x50\x51\x80\x81\x90\x91\xC0\xC1\xD0\xD1][\x20-37][\x00\x20\x40\x60\x80\xA0\xC0\xE0]/s', $MPCheaderData)) {
- // this is SV4 - SV6, handle seperately
- return $this->ParseMPCsv6($fd, $ThisFileInfo);
- } else {
- $ThisFileInfo['error'][] = 'Expecting "MP+" or "MPCK" at offset '.$ThisFileInfo['avdataoffset'].', found "'.substr($MPCheaderData, 0, 4).'"';
- unset($ThisFileInfo['fileformat']);
- unset($ThisFileInfo['mpc']);
- return false;
- }
- return false;
- }
- function ParseMPCsv8(&$fd, &$ThisFileInfo) {
- // this is SV8
- // http://trac.musepack.net/trac/wiki/SV8Specification
- $thisfile_mpc_header = &$ThisFileInfo['mpc']['header'];
- $keyNameSize = 2;
- $maxHandledPacketLength = 9; // specs say: "n*8; 0 < n < 10"
- $offset = ftell($fd);
- while ($offset < $ThisFileInfo['avdataend']) {
- $thisPacket = array();
- $thisPacket['offset'] = $offset;
- $packet_offset = 0;
- // Size is a variable-size field, could be 1-4 bytes (possibly more?)
- // read enough data in and figure out the exact size later
- $MPCheaderData = fread($fd, $keyNameSize + $maxHandledPacketLength);
- $packet_offset += $keyNameSize;
- $thisPacket['key'] = substr($MPCheaderData, 0, $keyNameSize);
- $thisPacket['key_name'] = $this->MPCsv8PacketName($thisPacket['key']);
- if ($thisPacket['key'] == $thisPacket['key_name']) {
- $ThisFileInfo['error'][] = 'Found unexpected key value "'.$thisPacket['key'].'" at offset '.$thisPacket['offset'];
- return false;
- }
- $packetLength = 0;
- $thisPacket['packet_size'] = $this->SV8variableLengthInteger(substr($MPCheaderData, $keyNameSize), $packetLength); // includes keyname and packet_size field
- if ($thisPacket['packet_size'] === false) {
- $ThisFileInfo['error'][] = 'Did not find expected packet length within '.$maxHandledPacketLength.' bytes at offset '.($thisPacket['offset'] + $keyNameSize);
- return false;
- }
- $packet_offset += $packetLength;
- $offset += $thisPacket['packet_size'];
- switch ($thisPacket['key']) {
- case 'SH': // Stream Header
- $moreBytesToRead = $thisPacket['packet_size'] - $keyNameSize - $maxHandledPacketLength;
- if ($moreBytesToRead > 0) {
- $MPCheaderData .= fread($fd, $moreBytesToRead);
- }
- $thisPacket['crc'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 4));
- $packet_offset += 4;
- $thisPacket['stream_version'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 1));
- $packet_offset += 1;
- $packetLength = 0;
- $thisPacket['sample_count'] = $this->SV8variableLengthInteger(substr($MPCheaderData, $packet_offset, $maxHandledPacketLength), $packetLength);
- $packet_offset += $packetLength;
- $packetLength = 0;
- $thisPacket['beginning_silence'] = $this->SV8variableLengthInteger(substr($MPCheaderData, $packet_offset, $maxHandledPacketLength), $packetLength);
- $packet_offset += $packetLength;
- $otherUsefulData = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 2));
- $packet_offset += 2;
- $thisPacket['sample_frequency_raw'] = (($otherUsefulData & 0xE000) >> 13);
- $thisPacket['max_bands_used'] = (($otherUsefulData & 0x1F00) >> 8);
- $thisPacket['channels'] = (($otherUsefulData & 0x00F0) >> 4) + 1;
- $thisPacket['ms_used'] = (bool) (($otherUsefulData & 0x0008) >> 3);
- $thisPacket['audio_block_frames'] = (($otherUsefulData & 0x0007) >> 0);
- $thisPacket['sample_frequency'] = $this->MPCfrequencyLookup($thisPacket['sample_frequency_raw']);
- $thisfile_mpc_header['mid_side_stereo'] = $thisPacket['ms_used'];
- $thisfile_mpc_header['sample_rate'] = $thisPacket['sample_frequency'];
- $thisfile_mpc_header['samples'] = $thisPacket['sample_count'];
- $thisfile_mpc_header['stream_version_major'] = $thisPacket['stream_version'];
- $ThisFileInfo['audio']['channels'] = $thisPacket['channels'];
- $ThisFileInfo['audio']['sample_rate'] = $thisPacket['sample_frequency'];
- $ThisFileInfo['playtime_seconds'] = $thisPacket['sample_count'] / $thisPacket['sample_frequency'];
- $ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
- break;
- case 'RG': // Replay Gain
- $moreBytesToRead = $thisPacket['packet_size'] - $keyNameSize - $maxHandledPacketLength;
- if ($moreBytesToRead > 0) {
- $MPCheaderData .= fread($fd, $moreBytesToRead);
- }
- $thisPacket['replaygain_version'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 1));
- $packet_offset += 1;
- $thisPacket['replaygain_title_gain'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 2));
- $packet_offset += 2;
- $thisPacket['replaygain_title_peak'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 2));
- $packet_offset += 2;
- $thisPacket['replaygain_album_gain'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 2));
- $packet_offset += 2;
- $thisPacket['replaygain_album_peak'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 2));
- $packet_offset += 2;
- if ($thisPacket['replaygain_title_gain']) { $ThisFileInfo['replay_gain']['title']['gain'] = $thisPacket['replaygain_title_gain']; }
- if ($thisPacket['replaygain_title_peak']) { $ThisFileInfo['replay_gain']['title']['peak'] = $thisPacket['replaygain_title_peak']; }
- if ($thisPacket['replaygain_album_gain']) { $ThisFileInfo['replay_gain']['album']['gain'] = $thisPacket['replaygain_album_gain']; }
- if ($thisPacket['replaygain_album_peak']) { $ThisFileInfo['replay_gain']['album']['peak'] = $thisPacket['replaygain_album_peak']; }
- break;
- case 'EI': // Encoder Info
- $moreBytesToRead = $thisPacket['packet_size'] - $keyNameSize - $maxHandledPacketLength;
- if ($moreBytesToRead > 0) {
- $MPCheaderData .= fread($fd, $moreBytesToRead);
- }
- $profile_pns = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 1));
- $packet_offset += 1;
- $quality_int = (($profile_pns & 0xF0) >> 4);
- $quality_dec = (($profile_pns & 0x0E) >> 3);
- $thisPacket['quality'] = (float) $quality_int + ($quality_dec / 8);
- $thisPacket['pns_tool'] = (bool) (($profile_pns & 0x01) >> 0);
- $thisPacket['version_major'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 1));
- $packet_offset += 1;
- $thisPacket['version_minor'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 1));
- $packet_offset += 1;
- $thisPacket['version_build'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 1));
- $packet_offset += 1;
- $thisPacket['version'] = $thisPacket['version_major'].'.'.$thisPacket['version_minor'].'.'.$thisPacket['version_build'];
- $ThisFileInfo['audio']['encoder'] = 'MPC v'.$thisPacket['version'].' ('.(($thisPacket['version_minor'] % 2) ? 'unstable' : 'stable').')';
- $thisfile_mpc_header['encoder_version'] = $ThisFileInfo['audio']['encoder'];
- //$thisfile_mpc_header['quality'] = (float) ($thisPacket['quality'] / 1.5875); // values can range from 0.000 to 15.875, mapped to qualities of 0.0 to 10.0
- $thisfile_mpc_header['quality'] = (float) ($thisPacket['quality'] - 5); // values can range from 0.000 to 15.875, of which 0..4 are "reserved/experimental", and 5..15 are mapped to qualities of 0.0 to 10.0
- break;
- case 'SO': // Seek Table Offset
- $packetLength = 0;
- $thisPacket['seek_table_offset'] = $thisPacket['offset'] + $this->SV8variableLengthInteger(substr($MPCheaderData, $packet_offset, $maxHandledPacketLength), $packetLength);
- $packet_offset += $packetLength;
- break;
- case 'ST': // Seek Table
- case 'SE': // Stream End
- case 'AP': // Audio Data
- // nothing useful here, just skip this packet
- $thisPacket = array();
- break;
- default:
- $ThisFileInfo['error'][] = 'Found unhandled key type "'.$thisPacket['key'].'" at offset '.$thisPacket['offset'];
- return false;
- break;
- }
- if (!empty($thisPacket)) {
- $ThisFileInfo['mpc']['packets'][] = $thisPacket;
- }
- fseek($fd, $offset);
- }
- $thisfile_mpc_header['size'] = $offset;
- return true;
- }
- function ParseMPCsv7(&$fd, &$ThisFileInfo) {
- // this is SV7
- // http://www.uni-jena.de/~pfk/mpp/sv8/header.html
- $thisfile_mpc_header = &$ThisFileInfo['mpc']['header'];
- $offset = 0;
- $thisfile_mpc_header['size'] = 28;
- $MPCheaderData = $ThisFileInfo['mpc']['header']['preamble'];
- $MPCheaderData .= fread($fd, $thisfile_mpc_header['size'] - strlen($ThisFileInfo['mpc']['header']['preamble']));
- $offset = strlen('MP+');
- $StreamVersionByte = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 1));
- $offset += 1;
- $thisfile_mpc_header['stream_version_major'] = ($StreamVersionByte & 0x0F) >> 0;
- $thisfile_mpc_header['stream_version_minor'] = ($StreamVersionByte & 0xF0) >> 4; // should always be 0, subversions no longer exist in SV8
- $thisfile_mpc_header['frame_count'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 4));
- $offset += 4;
- if ($thisfile_mpc_header['stream_version_major'] != 7) {
- $ThisFileInfo['error'][] = 'Only Musepack SV7 supported (this file claims to be v'.$thisfile_mpc_header['stream_version_major'].')';
- return false;
- }
- $FlagsDWORD1 = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 4));
- $offset += 4;
- $thisfile_mpc_header['intensity_stereo'] = (bool) (($FlagsDWORD1 & 0x80000000) >> 31);
- $thisfile_mpc_header['mid_side_stereo'] = (bool) (($FlagsDWORD1 & 0x40000000) >> 30);
- $thisfile_mpc_header['max_subband'] = ($FlagsDWORD1 & 0x3F000000) >> 24;
- $thisfile_mpc_header['raw']['profile'] = ($FlagsDWORD1 & 0x00F00000) >> 20;
- $thisfile_mpc_header['begin_loud'] = (bool) (($FlagsDWORD1 & 0x00080000) >> 19);
- $thisfile_mpc_header['end_loud'] = (bool) (($FlagsDWORD1 & 0x00040000) >> 18);
- $thisfile_mpc_header['raw']['sample_rate'] = ($FlagsDWORD1 & 0x00030000) >> 16;
- $thisfile_mpc_header['max_level'] = ($FlagsDWORD1 & 0x0000FFFF);
- $thisfile_mpc_header['raw']['title_peak'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 2));
- $offset += 2;
- $thisfile_mpc_header['raw']['title_gain'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 2), true);
- $offset += 2;
- $thisfile_mpc_header['raw']['album_peak'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 2));
- $offset += 2;
- $thisfile_mpc_header['raw']['album_gain'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 2), true);
- $offset += 2;
- $FlagsDWORD2 = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 4));
- $offset += 4;
- $thisfile_mpc_header['true_gapless'] = (bool) (($FlagsDWORD2 & 0x80000000) >> 31);
- $thisfile_mpc_header['last_frame_length'] = ($FlagsDWORD2 & 0x7FF00000) >> 20;
- $thisfile_mpc_header['raw']['not_sure_what'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 3));
- $offset += 3;
- $thisfile_mpc_header['raw']['encoder_version'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 1));
- $offset += 1;
- $thisfile_mpc_header['profile'] = $this->MPCprofileNameLookup($thisfile_mpc_header['raw']['profile']);
- $thisfile_mpc_header['sample_rate'] = $this->MPCfrequencyLookup($thisfile_mpc_header['raw']['sample_rate']);
- if ($thisfile_mpc_header['sample_rate'] == 0) {
- $ThisFileInfo['error'][] = 'Corrupt MPC file: frequency == zero';
- return false;
- }
- $ThisFileInfo['audio']['sample_rate'] = $thisfile_mpc_header['sample_rate'];
- $thisfile_mpc_header['samples'] = ((($thisfile_mpc_header['frame_count'] - 1) * 1152) + $thisfile_mpc_header['last_frame_length']) * $ThisFileInfo['audio']['channels'];
- $ThisFileInfo['playtime_seconds'] = ($thisfile_mpc_header['samples'] / $ThisFileInfo['audio']['channels']) / $ThisFileInfo['audio']['sample_rate'];
- if ($ThisFileInfo['playtime_seconds'] == 0) {
- $ThisFileInfo['error'][] = 'Corrupt MPC file: playtime_seconds == zero';
- return false;
- }
- // add size of file header to avdataoffset - calc bitrate correctly + MD5 data
- $ThisFileInfo['avdataoffset'] += $thisfile_mpc_header['size'];
- $ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
- $thisfile_mpc_header['title_peak'] = $thisfile_mpc_header['raw']['title_peak'];
- $thisfile_mpc_header['title_peak_db'] = $this->MPCpeakDBLookup($thisfile_mpc_header['title_peak']);
- if ($thisfile_mpc_header['raw']['title_gain'] < 0) {
- $thisfile_mpc_header['title_gain_db'] = (float) (32768 + $thisfile_mpc_header['raw']['title_gain']) / -100;
- } else {
- $thisfile_mpc_header['title_gain_db'] = (float) $thisfile_mpc_header['raw']['title_gain'] / 100;
- }
- $thisfile_mpc_header['album_peak'] = $thisfile_mpc_header['raw']['album_peak'];
- $thisfile_mpc_header['album_peak_db'] = $this->MPCpeakDBLookup($thisfile_mpc_header['album_peak']);
- if ($thisfile_mpc_header['raw']['album_gain'] < 0) {
- $thisfile_mpc_header['album_gain_db'] = (float) (32768 + $thisfile_mpc_header['raw']['album_gain']) / -100;
- } else {
- $thisfile_mpc_header['album_gain_db'] = (float) $thisfile_mpc_header['raw']['album_gain'] / 100;;
- }
- $thisfile_mpc_header['encoder_version'] = $this->MPCencoderVersionLookup($thisfile_mpc_header['raw']['encoder_version']);
- $ThisFileInfo['replay_gain']['track']['adjustment'] = $thisfile_mpc_header['title_gain_db'];
- $ThisFileInfo['replay_gain']['album']['adjustment'] = $thisfile_mpc_header['album_gain_db'];
- if ($thisfile_mpc_header['title_peak'] > 0) {
- $ThisFileInfo['replay_gain']['track']['peak'] = $thisfile_mpc_header['title_peak'];
- } elseif (round($thisfile_mpc_header['max_level'] * 1.18) > 0) {
- $ThisFileInfo['replay_gain']['track']['peak'] = getid3_lib::CastAsInt(round($thisfile_mpc_header['max_level'] * 1.18)); // why? I don't know - see mppdec.c
- }
- if ($thisfile_mpc_header['album_peak'] > 0) {
- $ThisFileInfo['replay_gain']['album']['peak'] = $thisfile_mpc_header['album_peak'];
- }
- //$ThisFileInfo['audio']['encoder'] = 'SV'.$thisfile_mpc_header['stream_version_major'].'.'.$thisfile_mpc_header['stream_version_minor'].', '.$thisfile_mpc_header['encoder_version'];
- $ThisFileInfo['audio']['encoder'] = $thisfile_mpc_header['encoder_version'];
- $ThisFileInfo['audio']['encoder_options'] = $thisfile_mpc_header['profile'];
- $thisfile_mpc_header['quality'] = (float) ($thisfile_mpc_header['raw']['profile'] - 5); // values can range from 0 to 15, of which 0..4 are "reserved/experimental", and 5..15 are mapped to qualities of 0.0 to 10.0
- return true;
- }
- function ParseMPCsv6(&$fd, &$ThisFileInfo) {
- // this is SV4 - SV6
- $thisfile_mpc_header = &$ThisFileInfo['mpc']['header'];
- $offset = 0;
- $thisfile_mpc_header['size'] = 8;
- fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
- $MPCheaderData = fread($fd, $thisfile_mpc_header['size']);
- // add size of file header to avdataoffset - calc bitrate correctly + MD5 data
- $ThisFileInfo['avdataoffset'] += $thisfile_mpc_header['size'];
- // Most of this code adapted from Jurgen Faul's MPEGplus source code - thanks Jurgen! :)
- $HeaderDWORD[0] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, 0, 4));
- $HeaderDWORD[1] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, 4, 4));
- // DDDD DDDD CCCC CCCC BBBB BBBB AAAA AAAA
- // aaaa aaaa abcd dddd dddd deee eeff ffff
- //
- // a = bitrate = anything
- // b = IS = anything
- // c = MS = anything
- // d = streamversion = 0000000004 or 0000000005 or 0000000006
- // e = maxband = anything
- // f = blocksize = 000001 for SV5+, anything(?) for SV4
- $thisfile_mpc_header['target_bitrate'] = (($HeaderDWORD[0] & 0xFF800000) >> 23);
- $thisfile_mpc_header['intensity_stereo'] = (bool) (($HeaderDWORD[0] & 0x00400000) >> 22);
- $thisfile_mpc_header['mid_side_stereo'] = (bool) (($HeaderDWORD[0] & 0x00200000) >> 21);
- $thisfile_mpc_header['stream_version_major'] = ($HeaderDWORD[0] & 0x001FF800) >> 11;
- $thisfile_mpc_header['stream_version_minor'] = 0; // no sub-version numbers before SV7
- $thisfile_mpc_header['max_band'] = ($HeaderDWORD[0] & 0x000007C0) >> 6; // related to lowpass frequency, not sure how it translates exactly
- $thisfile_mpc_header['block_size'] = ($HeaderDWORD[0] & 0x0000003F);
- switch ($thisfile_mpc_header['stream_version_major']) {
- case 4:
- $thisfile_mpc_header['frame_count'] = ($HeaderDWORD[1] >> 16);
- break;
- case 5:
- case 6:
- $thisfile_mpc_header['frame_count'] = $HeaderDWORD[1];
- break;
- default:
- $ThisFileInfo['error'] = 'Expecting 4, 5 or 6 in version field, found '.$thisfile_mpc_header['stream_version_major'].' instead';
- unset($ThisFileInfo['mpc']);
- return false;
- break;
- }
- if (($thisfile_mpc_header['stream_version_major'] > 4) && ($thisfile_mpc_header['block_size'] != 1)) {
- $ThisFileInfo['warning'][] = 'Block size expected to be 1, actual value found: '.$thisfile_mpc_header['block_size'];
- }
- $thisfile_mpc_header['sample_rate'] = 44100; // AB: used by all files up to SV7
- $ThisFileInfo['audio']['sample_rate'] = $thisfile_mpc_header['sample_rate'];
- $thisfile_mpc_header['samples'] = $thisfile_mpc_header['frame_count'] * 1152 * $ThisFileInfo['audio']['channels'];
- if ($thisfile_mpc_header['target_bitrate'] == 0) {
- $ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
- } else {
- $ThisFileInfo['audio']['bitrate_mode'] = 'cbr';
- }
- $ThisFileInfo['mpc']['bitrate'] = ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8 * 44100 / $thisfile_mpc_header['frame_count'] / 1152;
- $ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpc']['bitrate'];
- $ThisFileInfo['audio']['encoder'] = 'SV'.$thisfile_mpc_header['stream_version_major'];
- return true;
- }
- function MPCprofileNameLookup($profileid) {
- static $MPCprofileNameLookup = array(
- 0 => 'no profile',
- 1 => 'Experimental',
- 2 => 'unused',
- 3 => 'unused',
- 4 => 'unused',
- 5 => 'below Telephone (q = 0.0)',
- 6 => 'below Telephone (q = 1.0)',
- 7 => 'Telephone (q = 2.0)',
- 8 => 'Thumb (q = 3.0)',
- 9 => 'Radio (q = 4.0)',
- 10 => 'Standard (q = 5.0)',
- 11 => 'Extreme (q = 6.0)',
- 12 => 'Insane (q = 7.0)',
- 13 => 'BrainDead (q = 8.0)',
- 14 => 'above BrainDead (q = 9.0)',
- 15 => 'above BrainDead (q = 10.0)'
- );
- return (isset($MPCprofileNameLookup[$profileid]) ? $MPCprofileNameLookup[$profileid] : 'invalid');
- }
- function MPCfrequencyLookup($frequencyid) {
- static $MPCfrequencyLookup = array(
- 0 => 44100,
- 1 => 48000,
- 2 => 37800,
- 3 => 32000
- );
- return (isset($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 ($encoderversion == 0) {
- // very old version, not known exactly which
- return 'Buschmann v1.7.0-v1.7.9 or Klemm v0.90-v1.05';
- }
- if (($encoderversion % 10) == 0) {
- // release version
- return number_format($encoderversion / 100, 2);
- } elseif (($encoderversion % 2) == 0) {
- // beta version
- return number_format($encoderversion / 100, 2).' beta';
- }
- // alpha version
- return number_format($encoderversion / 100, 2).' alpha';
- }
- function SV8variableLengthInteger($data, &$packetLength, $maxHandledPacketLength=9) {
- $packet_size = 0;
- for ($packetLength = 1; $packetLength <= $maxHandledPacketLength; $packetLength++) {
- // variable-length size field:
- // bits, big-endian
- // 0xxx xxxx - value 0 to 2^7-1
- // 1xxx xxxx 0xxx xxxx - value 0 to 2^14-1
- // 1xxx xxxx 1xxx xxxx 0xxx xxxx - value 0 to 2^21-1
- // 1xxx xxxx 1xxx xxxx 1xxx xxxx 0xxx xxxx - value 0 to 2^28-1
- // ...
- $thisbyte = ord(substr($data, ($packetLength - 1), 1));
- // look through bytes until find a byte with MSB==0
- $packet_size = ($packet_size << 7);
- $packet_size = ($packet_size | ($thisbyte & 0x7F));
- if (($thisbyte & 0x80) === 0) {
- break;
- }
- if ($packetLength >= $maxHandledPacketLength) {
- return false;
- }
- }
- return $packet_size;
- }
- function MPCsv8PacketName($packetKey) {
- static $MPCsv8PacketName = array();
- if (empty($MPCsv8PacketName)) {
- $MPCsv8PacketName = array(
- 'AP' => 'Audio Packet',
- 'CT' => 'Chapter Tag',
- 'EI' => 'Encoder Info',
- 'RG' => 'Replay Gain',
- 'SE' => 'Stream End',
- 'SH' => 'Stream Header',
- 'SO' => 'Seek Table Offset',
- 'ST' => 'Seek Table',
- );
- }
- return (isset($MPCsv8PacketName[$packetKey]) ? $MPCsv8PacketName[$packetKey] : $packetKey);
- }
- }
- ?>
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