diff options
Diffstat (limited to 'getid3/module.audio.mpc.php')
| -rw-r--r-- | getid3/module.audio.mpc.php | 502 |
1 files changed, 0 insertions, 502 deletions
diff --git a/getid3/module.audio.mpc.php b/getid3/module.audio.mpc.php deleted file mode 100644 index ffe3366..0000000 --- a/getid3/module.audio.mpc.php +++ /dev/null @@ -1,502 +0,0 @@ -<?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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