502 lines
23 KiB
PHP
502 lines
23 KiB
PHP
<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at http://getid3.sourceforge.net //
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// or http://www.getid3.org //
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/////////////////////////////////////////////////////////////////
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// See readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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// //
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// module.audio.mpc.php //
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// module for analyzing Musepack/MPEG+ Audio files //
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// dependencies: NONE //
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// ///
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/////////////////////////////////////////////////////////////////
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class getid3_mpc
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{
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function getid3_mpc(&$fd, &$ThisFileInfo) {
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$ThisFileInfo['mpc']['header'] = array();
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$thisfile_mpc_header = &$ThisFileInfo['mpc']['header'];
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$ThisFileInfo['fileformat'] = 'mpc';
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$ThisFileInfo['audio']['dataformat'] = 'mpc';
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$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
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$ThisFileInfo['audio']['channels'] = 2; // up to SV7 the format appears to have been hardcoded for stereo only
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$ThisFileInfo['audio']['lossless'] = false;
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fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
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$MPCheaderData = fread($fd, 4);
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$ThisFileInfo['mpc']['header']['preamble'] = substr($MPCheaderData, 0, 4); // should be 'MPCK' (SV8) or 'MP+' (SV7), otherwise possible stream data (SV4-SV6)
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if (ereg('^MPCK', $ThisFileInfo['mpc']['header']['preamble'])) {
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// this is SV8
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return $this->ParseMPCsv8($fd, $ThisFileInfo);
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} elseif (ereg('^MP\+', $ThisFileInfo['mpc']['header']['preamble'])) {
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// this is SV7
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return $this->ParseMPCsv7($fd, $ThisFileInfo);
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} 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)) {
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// this is SV4 - SV6, handle seperately
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return $this->ParseMPCsv6($fd, $ThisFileInfo);
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} else {
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$ThisFileInfo['error'][] = 'Expecting "MP+" or "MPCK" at offset '.$ThisFileInfo['avdataoffset'].', found "'.substr($MPCheaderData, 0, 4).'"';
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unset($ThisFileInfo['fileformat']);
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unset($ThisFileInfo['mpc']);
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return false;
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}
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return false;
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}
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function ParseMPCsv8(&$fd, &$ThisFileInfo) {
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// this is SV8
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// http://trac.musepack.net/trac/wiki/SV8Specification
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$thisfile_mpc_header = &$ThisFileInfo['mpc']['header'];
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$keyNameSize = 2;
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$maxHandledPacketLength = 9; // specs say: "n*8; 0 < n < 10"
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$offset = ftell($fd);
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while ($offset < $ThisFileInfo['avdataend']) {
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$thisPacket = array();
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$thisPacket['offset'] = $offset;
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$packet_offset = 0;
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// Size is a variable-size field, could be 1-4 bytes (possibly more?)
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// read enough data in and figure out the exact size later
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$MPCheaderData = fread($fd, $keyNameSize + $maxHandledPacketLength);
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$packet_offset += $keyNameSize;
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$thisPacket['key'] = substr($MPCheaderData, 0, $keyNameSize);
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$thisPacket['key_name'] = $this->MPCsv8PacketName($thisPacket['key']);
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if ($thisPacket['key'] == $thisPacket['key_name']) {
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$ThisFileInfo['error'][] = 'Found unexpected key value "'.$thisPacket['key'].'" at offset '.$thisPacket['offset'];
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return false;
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}
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$packetLength = 0;
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$thisPacket['packet_size'] = $this->SV8variableLengthInteger(substr($MPCheaderData, $keyNameSize), $packetLength); // includes keyname and packet_size field
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if ($thisPacket['packet_size'] === false) {
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$ThisFileInfo['error'][] = 'Did not find expected packet length within '.$maxHandledPacketLength.' bytes at offset '.($thisPacket['offset'] + $keyNameSize);
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return false;
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}
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$packet_offset += $packetLength;
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$offset += $thisPacket['packet_size'];
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switch ($thisPacket['key']) {
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case 'SH': // Stream Header
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$moreBytesToRead = $thisPacket['packet_size'] - $keyNameSize - $maxHandledPacketLength;
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if ($moreBytesToRead > 0) {
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$MPCheaderData .= fread($fd, $moreBytesToRead);
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}
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$thisPacket['crc'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 4));
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$packet_offset += 4;
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$thisPacket['stream_version'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 1));
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$packet_offset += 1;
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$packetLength = 0;
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$thisPacket['sample_count'] = $this->SV8variableLengthInteger(substr($MPCheaderData, $packet_offset, $maxHandledPacketLength), $packetLength);
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$packet_offset += $packetLength;
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$packetLength = 0;
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$thisPacket['beginning_silence'] = $this->SV8variableLengthInteger(substr($MPCheaderData, $packet_offset, $maxHandledPacketLength), $packetLength);
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$packet_offset += $packetLength;
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$otherUsefulData = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 2));
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$packet_offset += 2;
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$thisPacket['sample_frequency_raw'] = (($otherUsefulData & 0xE000) >> 13);
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$thisPacket['max_bands_used'] = (($otherUsefulData & 0x1F00) >> 8);
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$thisPacket['channels'] = (($otherUsefulData & 0x00F0) >> 4) + 1;
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$thisPacket['ms_used'] = (bool) (($otherUsefulData & 0x0008) >> 3);
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$thisPacket['audio_block_frames'] = (($otherUsefulData & 0x0007) >> 0);
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$thisPacket['sample_frequency'] = $this->MPCfrequencyLookup($thisPacket['sample_frequency_raw']);
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$thisfile_mpc_header['mid_side_stereo'] = $thisPacket['ms_used'];
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$thisfile_mpc_header['sample_rate'] = $thisPacket['sample_frequency'];
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$thisfile_mpc_header['samples'] = $thisPacket['sample_count'];
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$thisfile_mpc_header['stream_version_major'] = $thisPacket['stream_version'];
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$ThisFileInfo['audio']['channels'] = $thisPacket['channels'];
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$ThisFileInfo['audio']['sample_rate'] = $thisPacket['sample_frequency'];
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$ThisFileInfo['playtime_seconds'] = $thisPacket['sample_count'] / $thisPacket['sample_frequency'];
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$ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
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break;
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case 'RG': // Replay Gain
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$moreBytesToRead = $thisPacket['packet_size'] - $keyNameSize - $maxHandledPacketLength;
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if ($moreBytesToRead > 0) {
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$MPCheaderData .= fread($fd, $moreBytesToRead);
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}
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$thisPacket['replaygain_version'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 1));
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$packet_offset += 1;
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$thisPacket['replaygain_title_gain'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 2));
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$packet_offset += 2;
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$thisPacket['replaygain_title_peak'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 2));
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$packet_offset += 2;
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$thisPacket['replaygain_album_gain'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 2));
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$packet_offset += 2;
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$thisPacket['replaygain_album_peak'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 2));
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$packet_offset += 2;
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if ($thisPacket['replaygain_title_gain']) { $ThisFileInfo['replay_gain']['title']['gain'] = $thisPacket['replaygain_title_gain']; }
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if ($thisPacket['replaygain_title_peak']) { $ThisFileInfo['replay_gain']['title']['peak'] = $thisPacket['replaygain_title_peak']; }
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if ($thisPacket['replaygain_album_gain']) { $ThisFileInfo['replay_gain']['album']['gain'] = $thisPacket['replaygain_album_gain']; }
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if ($thisPacket['replaygain_album_peak']) { $ThisFileInfo['replay_gain']['album']['peak'] = $thisPacket['replaygain_album_peak']; }
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break;
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case 'EI': // Encoder Info
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$moreBytesToRead = $thisPacket['packet_size'] - $keyNameSize - $maxHandledPacketLength;
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if ($moreBytesToRead > 0) {
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$MPCheaderData .= fread($fd, $moreBytesToRead);
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}
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$profile_pns = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 1));
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$packet_offset += 1;
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$quality_int = (($profile_pns & 0xF0) >> 4);
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$quality_dec = (($profile_pns & 0x0E) >> 3);
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$thisPacket['quality'] = (float) $quality_int + ($quality_dec / 8);
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$thisPacket['pns_tool'] = (bool) (($profile_pns & 0x01) >> 0);
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$thisPacket['version_major'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 1));
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$packet_offset += 1;
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$thisPacket['version_minor'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 1));
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$packet_offset += 1;
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$thisPacket['version_build'] = getid3_lib::BigEndian2Int(substr($MPCheaderData, $packet_offset, 1));
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$packet_offset += 1;
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$thisPacket['version'] = $thisPacket['version_major'].'.'.$thisPacket['version_minor'].'.'.$thisPacket['version_build'];
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$ThisFileInfo['audio']['encoder'] = 'MPC v'.$thisPacket['version'].' ('.(($thisPacket['version_minor'] % 2) ? 'unstable' : 'stable').')';
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$thisfile_mpc_header['encoder_version'] = $ThisFileInfo['audio']['encoder'];
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//$thisfile_mpc_header['quality'] = (float) ($thisPacket['quality'] / 1.5875); // values can range from 0.000 to 15.875, mapped to qualities of 0.0 to 10.0
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$thisfile_mpc_header['quality'] = (float) ($thisPacket['quality'] - 5); // values can range from 0.000 to 15.875, of which 0..4 are "reserved/experimental", and 5..15 are mapped to qualities of 0.0 to 10.0
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break;
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case 'SO': // Seek Table Offset
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$packetLength = 0;
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$thisPacket['seek_table_offset'] = $thisPacket['offset'] + $this->SV8variableLengthInteger(substr($MPCheaderData, $packet_offset, $maxHandledPacketLength), $packetLength);
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$packet_offset += $packetLength;
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break;
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case 'ST': // Seek Table
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case 'SE': // Stream End
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case 'AP': // Audio Data
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// nothing useful here, just skip this packet
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$thisPacket = array();
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break;
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default:
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$ThisFileInfo['error'][] = 'Found unhandled key type "'.$thisPacket['key'].'" at offset '.$thisPacket['offset'];
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return false;
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break;
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}
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if (!empty($thisPacket)) {
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$ThisFileInfo['mpc']['packets'][] = $thisPacket;
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}
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fseek($fd, $offset);
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}
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$thisfile_mpc_header['size'] = $offset;
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return true;
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}
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function ParseMPCsv7(&$fd, &$ThisFileInfo) {
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// this is SV7
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// http://www.uni-jena.de/~pfk/mpp/sv8/header.html
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$thisfile_mpc_header = &$ThisFileInfo['mpc']['header'];
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$offset = 0;
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$thisfile_mpc_header['size'] = 28;
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$MPCheaderData = $ThisFileInfo['mpc']['header']['preamble'];
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$MPCheaderData .= fread($fd, $thisfile_mpc_header['size'] - strlen($ThisFileInfo['mpc']['header']['preamble']));
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$offset = strlen('MP+');
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$StreamVersionByte = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 1));
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$offset += 1;
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$thisfile_mpc_header['stream_version_major'] = ($StreamVersionByte & 0x0F) >> 0;
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$thisfile_mpc_header['stream_version_minor'] = ($StreamVersionByte & 0xF0) >> 4; // should always be 0, subversions no longer exist in SV8
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$thisfile_mpc_header['frame_count'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 4));
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$offset += 4;
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if ($thisfile_mpc_header['stream_version_major'] != 7) {
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$ThisFileInfo['error'][] = 'Only Musepack SV7 supported (this file claims to be v'.$thisfile_mpc_header['stream_version_major'].')';
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return false;
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}
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$FlagsDWORD1 = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 4));
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$offset += 4;
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$thisfile_mpc_header['intensity_stereo'] = (bool) (($FlagsDWORD1 & 0x80000000) >> 31);
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$thisfile_mpc_header['mid_side_stereo'] = (bool) (($FlagsDWORD1 & 0x40000000) >> 30);
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$thisfile_mpc_header['max_subband'] = ($FlagsDWORD1 & 0x3F000000) >> 24;
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$thisfile_mpc_header['raw']['profile'] = ($FlagsDWORD1 & 0x00F00000) >> 20;
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$thisfile_mpc_header['begin_loud'] = (bool) (($FlagsDWORD1 & 0x00080000) >> 19);
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$thisfile_mpc_header['end_loud'] = (bool) (($FlagsDWORD1 & 0x00040000) >> 18);
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$thisfile_mpc_header['raw']['sample_rate'] = ($FlagsDWORD1 & 0x00030000) >> 16;
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$thisfile_mpc_header['max_level'] = ($FlagsDWORD1 & 0x0000FFFF);
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$thisfile_mpc_header['raw']['title_peak'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 2));
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$offset += 2;
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$thisfile_mpc_header['raw']['title_gain'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 2), true);
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$offset += 2;
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$thisfile_mpc_header['raw']['album_peak'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 2));
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$offset += 2;
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$thisfile_mpc_header['raw']['album_gain'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 2), true);
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$offset += 2;
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$FlagsDWORD2 = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 4));
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$offset += 4;
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$thisfile_mpc_header['true_gapless'] = (bool) (($FlagsDWORD2 & 0x80000000) >> 31);
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$thisfile_mpc_header['last_frame_length'] = ($FlagsDWORD2 & 0x7FF00000) >> 20;
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$thisfile_mpc_header['raw']['not_sure_what'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 3));
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$offset += 3;
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$thisfile_mpc_header['raw']['encoder_version'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 1));
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$offset += 1;
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$thisfile_mpc_header['profile'] = $this->MPCprofileNameLookup($thisfile_mpc_header['raw']['profile']);
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$thisfile_mpc_header['sample_rate'] = $this->MPCfrequencyLookup($thisfile_mpc_header['raw']['sample_rate']);
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if ($thisfile_mpc_header['sample_rate'] == 0) {
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$ThisFileInfo['error'][] = 'Corrupt MPC file: frequency == zero';
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return false;
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}
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$ThisFileInfo['audio']['sample_rate'] = $thisfile_mpc_header['sample_rate'];
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$thisfile_mpc_header['samples'] = ((($thisfile_mpc_header['frame_count'] - 1) * 1152) + $thisfile_mpc_header['last_frame_length']) * $ThisFileInfo['audio']['channels'];
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$ThisFileInfo['playtime_seconds'] = ($thisfile_mpc_header['samples'] / $ThisFileInfo['audio']['channels']) / $ThisFileInfo['audio']['sample_rate'];
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if ($ThisFileInfo['playtime_seconds'] == 0) {
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$ThisFileInfo['error'][] = 'Corrupt MPC file: playtime_seconds == zero';
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return false;
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}
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// add size of file header to avdataoffset - calc bitrate correctly + MD5 data
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$ThisFileInfo['avdataoffset'] += $thisfile_mpc_header['size'];
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$ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
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$thisfile_mpc_header['title_peak'] = $thisfile_mpc_header['raw']['title_peak'];
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$thisfile_mpc_header['title_peak_db'] = $this->MPCpeakDBLookup($thisfile_mpc_header['title_peak']);
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if ($thisfile_mpc_header['raw']['title_gain'] < 0) {
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$thisfile_mpc_header['title_gain_db'] = (float) (32768 + $thisfile_mpc_header['raw']['title_gain']) / -100;
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} else {
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$thisfile_mpc_header['title_gain_db'] = (float) $thisfile_mpc_header['raw']['title_gain'] / 100;
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}
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$thisfile_mpc_header['album_peak'] = $thisfile_mpc_header['raw']['album_peak'];
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$thisfile_mpc_header['album_peak_db'] = $this->MPCpeakDBLookup($thisfile_mpc_header['album_peak']);
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if ($thisfile_mpc_header['raw']['album_gain'] < 0) {
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$thisfile_mpc_header['album_gain_db'] = (float) (32768 + $thisfile_mpc_header['raw']['album_gain']) / -100;
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} else {
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$thisfile_mpc_header['album_gain_db'] = (float) $thisfile_mpc_header['raw']['album_gain'] / 100;;
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}
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$thisfile_mpc_header['encoder_version'] = $this->MPCencoderVersionLookup($thisfile_mpc_header['raw']['encoder_version']);
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$ThisFileInfo['replay_gain']['track']['adjustment'] = $thisfile_mpc_header['title_gain_db'];
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$ThisFileInfo['replay_gain']['album']['adjustment'] = $thisfile_mpc_header['album_gain_db'];
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if ($thisfile_mpc_header['title_peak'] > 0) {
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$ThisFileInfo['replay_gain']['track']['peak'] = $thisfile_mpc_header['title_peak'];
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} elseif (round($thisfile_mpc_header['max_level'] * 1.18) > 0) {
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$ThisFileInfo['replay_gain']['track']['peak'] = getid3_lib::CastAsInt(round($thisfile_mpc_header['max_level'] * 1.18)); // why? I don't know - see mppdec.c
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}
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if ($thisfile_mpc_header['album_peak'] > 0) {
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$ThisFileInfo['replay_gain']['album']['peak'] = $thisfile_mpc_header['album_peak'];
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}
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//$ThisFileInfo['audio']['encoder'] = 'SV'.$thisfile_mpc_header['stream_version_major'].'.'.$thisfile_mpc_header['stream_version_minor'].', '.$thisfile_mpc_header['encoder_version'];
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$ThisFileInfo['audio']['encoder'] = $thisfile_mpc_header['encoder_version'];
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$ThisFileInfo['audio']['encoder_options'] = $thisfile_mpc_header['profile'];
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$thisfile_mpc_header['quality'] = (float) ($thisfile_mpc_header['raw']['profile'] - 5); // values can range from 0 to 15, of which 0..4 are "reserved/experimental", and 5..15 are mapped to qualities of 0.0 to 10.0
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return true;
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}
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function ParseMPCsv6(&$fd, &$ThisFileInfo) {
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// this is SV4 - SV6
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$thisfile_mpc_header = &$ThisFileInfo['mpc']['header'];
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$offset = 0;
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$thisfile_mpc_header['size'] = 8;
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fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
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$MPCheaderData = fread($fd, $thisfile_mpc_header['size']);
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// add size of file header to avdataoffset - calc bitrate correctly + MD5 data
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$ThisFileInfo['avdataoffset'] += $thisfile_mpc_header['size'];
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// Most of this code adapted from Jurgen Faul's MPEGplus source code - thanks Jurgen! :)
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$HeaderDWORD[0] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, 0, 4));
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$HeaderDWORD[1] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, 4, 4));
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// DDDD DDDD CCCC CCCC BBBB BBBB AAAA AAAA
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// aaaa aaaa abcd dddd dddd deee eeff ffff
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//
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// a = bitrate = anything
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// b = IS = anything
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// c = MS = anything
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// d = streamversion = 0000000004 or 0000000005 or 0000000006
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// e = maxband = anything
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// f = blocksize = 000001 for SV5+, anything(?) for SV4
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$thisfile_mpc_header['target_bitrate'] = (($HeaderDWORD[0] & 0xFF800000) >> 23);
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$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);
|
|
}
|
|
}
|
|
|
|
|
|
?>
|