Syntax Syntax
Parameters Parameters
- $offset
-
(Required)
- $info
-
(Required)
- $recursivesearch
-
(Optional)
Default value: true
- $ScanAsCBR
-
(Optional)
Default value: false
- $FastMPEGheaderScan
-
(Optional)
Default value: false
Return Return
(bool)
Source Source
File: wp-includes/ID3/module.audio.mp3.php
* * @return bool */ public function decodeMPEGaudioHeader($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) { static $MPEGaudioVersionLookup; static $MPEGaudioLayerLookup; static $MPEGaudioBitrateLookup; static $MPEGaudioFrequencyLookup; static $MPEGaudioChannelModeLookup; static $MPEGaudioModeExtensionLookup; static $MPEGaudioEmphasisLookup; if (empty($MPEGaudioVersionLookup)) { $MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); $MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray(); $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray(); $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray(); $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray(); } if ($this->fseek($offset) != 0) { $this->error('decodeMPEGaudioHeader() failed to seek to next offset at '.$offset); return false; } //$headerstring = $this->fread(1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame $headerstring = $this->fread(226); // LAME header at offset 36 + 190 bytes of Xing/LAME data // MP3 audio frame structure: // $aa $aa $aa $aa [$bb $bb] $cc... // where $aa..$aa is the four-byte mpeg-audio header (below) // $bb $bb is the optional 2-byte CRC // and $cc... is the audio data $head4 = substr($headerstring, 0, 4); $head4_key = getid3_lib::PrintHexBytes($head4, true, false, false); static $MPEGaudioHeaderDecodeCache = array(); if (isset($MPEGaudioHeaderDecodeCache[$head4_key])) { $MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4_key]; } else { $MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4); $MPEGaudioHeaderDecodeCache[$head4_key] = $MPEGheaderRawArray; } static $MPEGaudioHeaderValidCache = array(); if (!isset($MPEGaudioHeaderValidCache[$head4_key])) { // Not in cache //$MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1) $MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false); } // shortcut if (!isset($info['mpeg']['audio'])) { $info['mpeg']['audio'] = array(); } $thisfile_mpeg_audio = &$info['mpeg']['audio']; if ($MPEGaudioHeaderValidCache[$head4_key]) { $thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray; } else { $this->error('Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') at offset '.$offset); return false; } if (!$FastMPEGheaderScan) { $thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']]; $thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']]; $thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']]; $thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2); $thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']]; $thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection']; $thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private']; $thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']]; $thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright']; $thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original']; $thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']]; $info['audio']['channels'] = $thisfile_mpeg_audio['channels']; $info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate']; if ($thisfile_mpeg_audio['protection']) { $thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2)); } } if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) { // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0 $this->warning('Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1'); $thisfile_mpeg_audio['raw']['bitrate'] = 0; } $thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding']; $thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']]; if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) { // only skip multiple frame check if free-format bitstream found at beginning of file // otherwise is quite possibly simply corrupted data $recursivesearch = false; } // For Layer 2 there are some combinations of bitrate and mode which are not allowed. if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) { $info['audio']['dataformat'] = 'mp2'; switch ($thisfile_mpeg_audio['channelmode']) { case 'mono': if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) { // these are ok } else { $this->error($thisfile_mpeg_audio['bitrate'].'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.'); return false; } break; case 'stereo': case 'joint stereo': case 'dual channel': if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) { // these are ok } else { $this->error(intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.'); return false; } break; } } if ($info['audio']['sample_rate'] > 0) { $thisfile_mpeg_audio['framelength'] = self::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']); } $nextframetestoffset = $offset + 1; if ($thisfile_mpeg_audio['bitrate'] != 'free') { $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; if (isset($thisfile_mpeg_audio['framelength'])) { $nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength']; } else { $this->error('Frame at offset('.$offset.') is has an invalid frame length.'); return false; } } $ExpectedNumberOfAudioBytes = 0; //////////////////////////////////////////////////////////////////////////////////// // Variable-bitrate headers if (substr($headerstring, 4 + 32, 4) == 'VBRI') { // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36) // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; $thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer'; $info['audio']['codec'] = 'Fraunhofer'; $SideInfoData = substr($headerstring, 4 + 2, 32); $FraunhoferVBROffset = 36; $thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 4, 2)); // VbriVersion $thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 6, 2)); // VbriDelay $thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 8, 2)); // VbriQuality $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4)); // VbriStreamBytes $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4)); // VbriStreamFrames $thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2)); // VbriTableSize $thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2)); // VbriTableScale $thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2)); // VbriEntryBytes $thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2)); // VbriEntryFrames $ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes']; $previousbyteoffset = $offset; for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) { $Fraunhofer_OffsetN = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes'])); $FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes']; $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']); $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset; $previousbyteoffset += $Fraunhofer_OffsetN; } } else { // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36) // depending on MPEG layer and number of channels $VBRidOffset = self::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']); $SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4); if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) { // 'Xing' is traditional Xing VBR frame // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.) // 'Info' *can* legally be used to specify a VBR file as well, however. // http://www.multiweb.cz/twoinches/MP3inside.htm //00..03 = "Xing" or "Info" //04..07 = Flags: // 0x01 Frames Flag set if value for number of frames in file is stored // 0x02 Bytes Flag set if value for filesize in bytes is stored // 0x04 TOC Flag set if values for TOC are stored // 0x08 VBR Scale Flag set if values for VBR scale is stored //08..11 Frames: Number of frames in file (including the first Xing/Info one) //12..15 Bytes: File length in Bytes //16..115 TOC (Table of Contents): // Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file. // Each Byte has a value according this formula: // (TOC[i] / 256) * fileLenInBytes // So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use: // TOC[(60/240)*100] = TOC[25] // and corresponding Byte in file is then approximately at: // (TOC[25]/256) * 5000000 //116..119 VBR Scale // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME // if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') { $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; $thisfile_mpeg_audio['VBR_method'] = 'Xing'; // } else { // $ScanAsCBR = true; // $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; // } $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4)); $thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001); $thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002); $thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004); $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008); if ($thisfile_mpeg_audio['xing_flags']['frames']) { $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 8, 4)); //$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame } if ($thisfile_mpeg_audio['xing_flags']['bytes']) { $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4)); } //if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { //if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { if (!empty($thisfile_mpeg_audio['VBR_frames'])) { $used_filesize = 0; if (!empty($thisfile_mpeg_audio['VBR_bytes'])) { $used_filesize = $thisfile_mpeg_audio['VBR_bytes']; } elseif (!empty($info['filesize'])) { $used_filesize = $info['filesize']; $used_filesize -= (isset($info['id3v2']['headerlength']) ? intval($info['id3v2']['headerlength']) : 0); $used_filesize -= (isset($info['id3v1']) ? 128 : 0); $used_filesize -= (isset($info['tag_offset_end']) ? $info['tag_offset_end'] - $info['tag_offset_start'] : 0); $this->warning('MP3.Xing header missing VBR_bytes, assuming MPEG audio portion of file is '.number_format($used_filesize).' bytes'); } $framelengthfloat = $used_filesize / $thisfile_mpeg_audio['VBR_frames']; if ($thisfile_mpeg_audio['layer'] == '1') { // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 //$info['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; $info['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12; } else { // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 //$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; $info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144; } $thisfile_mpeg_audio['framelength'] = floor($framelengthfloat); } if ($thisfile_mpeg_audio['xing_flags']['toc']) { $LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100); for ($i = 0; $i < 100; $i++) { $thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData[$i]); } } if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) { $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4)); } // http://gabriel.mp3-tech.org/mp3infotag.html if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') { // shortcut $thisfile_mpeg_audio['LAME'] = array(); $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; $thisfile_mpeg_audio_lame['long_version'] = substr($headerstring, $VBRidOffset + 120, 20); $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9); $thisfile_mpeg_audio_lame['numeric_version'] = str_replace('LAME', '', $thisfile_mpeg_audio_lame['short_version']); if (preg_match('#^LAME([0-9\\.a-z]+)#', $thisfile_mpeg_audio_lame['long_version'], $matches)) { $thisfile_mpeg_audio_lame['short_version'] = $matches[0]; $thisfile_mpeg_audio_lame['numeric_version'] = $matches[1]; } foreach (explode('.', $thisfile_mpeg_audio_lame['numeric_version']) as $key => $number) { $thisfile_mpeg_audio_lame['integer_version'][$key] = intval($number); } //if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') { if ((($thisfile_mpeg_audio_lame['integer_version'][0] * 1000) + $thisfile_mpeg_audio_lame['integer_version'][1]) >= 3090) { // cannot use string version compare, may have "LAME3.90" or "LAME3.100" -- see https://github.com/JamesHeinrich/getID3/issues/207 // extra 11 chars are not part of version string when LAMEtag present unset($thisfile_mpeg_audio_lame['long_version']); // It the LAME tag was only introduced in LAME v3.90 // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933 // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html // are assuming a 'Xing' identifier offset of 0x24, which is the case for // MPEG-1 non-mono, but not for other combinations $LAMEtagOffsetContant = $VBRidOffset - 0x24; // shortcuts $thisfile_mpeg_audio_lame['RGAD'] = array('track'=>array(), 'album'=>array()); $thisfile_mpeg_audio_lame_RGAD = &$thisfile_mpeg_audio_lame['RGAD']; $thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track']; $thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album']; $thisfile_mpeg_audio_lame['raw'] = array(); $thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw']; // byte $9B VBR Quality // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications. // Actually overwrites original Xing bytes unset($thisfile_mpeg_audio['VBR_scale']); $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1)); // bytes $9C-$A4 Encoder short VersionString $thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9); // byte $A5 Info Tag revision + VBR method $LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1)); $thisfile_mpeg_audio_lame['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4; $thisfile_mpeg_audio_lame_raw['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F; $thisfile_mpeg_audio_lame['vbr_method'] = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']); $thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr' // byte $A6 Lowpass filter value $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100; // bytes $A7-$AE Replay Gain // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude" if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') { // LAME 3.94a16 and later - 9.23 fixed point // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608); } else { // LAME 3.94a15 and earlier - 32-bit floating point // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4)); } if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) { unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']); } else { $thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']); } $thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2)); $thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2)); if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) { $thisfile_mpeg_audio_lame_RGAD_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13; $thisfile_mpeg_audio_lame_RGAD_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10; $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9; $thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF; $thisfile_mpeg_audio_lame_RGAD_track['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']); $thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']); $thisfile_mpeg_audio_lame_RGAD_track['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']); if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) { $info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude']; } $info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator']; $info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db']; } else { unset($thisfile_mpeg_audio_lame_RGAD['track']); } if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) { $thisfile_mpeg_audio_lame_RGAD_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13; $thisfile_mpeg_audio_lame_RGAD_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10; $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9; $thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF; $thisfile_mpeg_audio_lame_RGAD_album['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']); $thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']); $thisfile_mpeg_audio_lame_RGAD_album['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']); if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) { $info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude']; } $info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator']; $info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db']; } else { unset($thisfile_mpeg_audio_lame_RGAD['album']); } if (empty($thisfile_mpeg_audio_lame_RGAD)) { unset($thisfile_mpeg_audio_lame['RGAD']); } // byte $AF Encoding flags + ATH Type $EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1)); $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($EncodingFlagsATHtype & 0x10); $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20); $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($EncodingFlagsATHtype & 0x40); $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($EncodingFlagsATHtype & 0x80); $thisfile_mpeg_audio_lame['ath_type'] = $EncodingFlagsATHtype & 0x0F; // byte $B0 if ABR {specified bitrate} else {minimal bitrate} $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1)); if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR) $thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; } elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR) // ignore } elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate $thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; } // bytes $B1-$B3 Encoder delays $EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3)); $thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12; $thisfile_mpeg_audio_lame['end_padding'] = $EncoderDelays & 0x000FFF; // byte $B4 Misc $MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1)); $thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($MiscByte & 0x03); $thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($MiscByte & 0x1C) >> 2; $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5; $thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($MiscByte & 0xC0) >> 6; $thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping']; $thisfile_mpeg_audio_lame['stereo_mode'] = self::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']); $thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality']; $thisfile_mpeg_audio_lame['source_sample_freq'] = self::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']); // byte $B5 MP3 Gain $thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true); $thisfile_mpeg_audio_lame['mp3_gain_db'] = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain']; $thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6)); // bytes $B6-$B7 Preset and surround info $PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2)); // Reserved = ($PresetSurroundBytes & 0xC000); $thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800); $thisfile_mpeg_audio_lame['surround_info'] = self::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']); $thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF); $thisfile_mpeg_audio_lame['preset_used'] = self::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame); if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) { $this->warning('Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org'); } if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) { // this may change if 3.90.4 ever comes out $thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3'; } // bytes $B8-$BB MusicLength $thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4)); $ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']); // bytes $BC-$BD MusicCRC $thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2)); // bytes $BE-$BF CRC-16 of Info Tag $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2)); // LAME CBR if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; $thisfile_mpeg_audio['bitrate'] = self::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']); $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; //if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) { // $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min']; //} } } } } else { // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header) $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; if ($recursivesearch) { $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; if ($this->RecursiveFrameScanning($offset, $nextframetestoffset, true)) { $recursivesearch = false; $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; } if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') { $this->warning('VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.'); } } } } if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) { if ($ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) { if ($this->isDependencyFor('matroska') || $this->isDependencyFor('riff')) { // ignore, audio data is broken into chunks so will always be data "missing" } elseif (($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) { $this->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)'); } else { $this->warning('Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)'); } } else { if ((($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) { // $prenullbytefileoffset = $this->ftell(); // $this->fseek($info['avdataend']); // $PossibleNullByte = $this->fread(1); // $this->fseek($prenullbytefileoffset); // if ($PossibleNullByte === "\x00") { $info['avdataend']--; // $this->warning('Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored'); // } else { // $this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)'); // } } else { $this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)'); } } } if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) { if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) { $framebytelength = $this->FreeFormatFrameLength($offset, true); if ($framebytelength > 0) { $thisfile_mpeg_audio['framelength'] = $framebytelength; if ($thisfile_mpeg_audio['layer'] == '1') { // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 $info['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; } else { // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 $info['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; } } else { $this->error('Error calculating frame length of free-format MP3 without Xing/LAME header'); } } } if (isset($thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') { switch ($thisfile_mpeg_audio['bitrate_mode']) { case 'vbr': case 'abr': $bytes_per_frame = 1152; if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) { $bytes_per_frame = 384; } elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) { $bytes_per_frame = 576; } $thisfile_mpeg_audio['VBR_bitrate'] = (isset($thisfile_mpeg_audio['VBR_bytes']) ? (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / $bytes_per_frame) : 0); if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) { $info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion } break; } } // End variable-bitrate headers //////////////////////////////////////////////////////////////////////////////////// if ($recursivesearch) { if (!$this->RecursiveFrameScanning($offset, $nextframetestoffset, $ScanAsCBR)) { return false; } } //if (false) { // // experimental side info parsing section - not returning anything useful yet // // $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData); // $SideInfoOffset = 0; // // if ($thisfile_mpeg_audio['version'] == '1') { // if ($thisfile_mpeg_audio['channelmode'] == 'mono') { // // MPEG-1 (mono) // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9); // $SideInfoOffset += 9; // $SideInfoOffset += 5; // } else { // // MPEG-1 (stereo, joint-stereo, dual-channel) // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9); // $SideInfoOffset += 9; // $SideInfoOffset += 3; // } // } else { // 2 or 2.5 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') { // // MPEG-2, MPEG-2.5 (mono) // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8); // $SideInfoOffset += 8; // $SideInfoOffset += 1; // } else { // // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel) // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8); // $SideInfoOffset += 8; // $SideInfoOffset += 2; // } // } // // if ($thisfile_mpeg_audio['version'] == '1') { // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) { // for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) { // $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1); // $SideInfoOffset += 2; // } // } // } // for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) { // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) { // $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12); // $SideInfoOffset += 12; // $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9); // $SideInfoOffset += 9; // $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8); // $SideInfoOffset += 8; // if ($thisfile_mpeg_audio['version'] == '1') { // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4); // $SideInfoOffset += 4; // } else { // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9); // $SideInfoOffset += 9; // } // $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); // $SideInfoOffset += 1; // // if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') { // // $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2); // $SideInfoOffset += 2; // $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); // $SideInfoOffset += 1; // // for ($region = 0; $region < 2; $region++) { // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5); // $SideInfoOffset += 5; // } // $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0; // // for ($window = 0; $window < 3; $window++) { // $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3); // $SideInfoOffset += 3; // } // // } else { // // for ($region = 0; $region < 3; $region++) { // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5); // $SideInfoOffset += 5; // } // // $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4); // $SideInfoOffset += 4; // $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3); // $SideInfoOffset += 3; // $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0; // } // // if ($thisfile_mpeg_audio['version'] == '1') { // $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);