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getid3_mp3 Class Reference
+ Collaboration diagram for getid3_mp3:

Public Member Functions

 getid3_mp3 (&$fd, &$ThisFileInfo)
 GuessEncoderOptions (&$ThisFileInfo)
 decodeMPEGaudioHeader ($fd, $offset, &$ThisFileInfo, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false)
 RecursiveFrameScanning (&$fd, &$ThisFileInfo, &$offset, &$nextframetestoffset, $ScanAsCBR)
 FreeFormatFrameLength ($fd, $offset, &$ThisFileInfo, $deepscan=false)
 getOnlyMPEGaudioInfoBruteForce ($fd, &$ThisFileInfo)
 getOnlyMPEGaudioInfo ($fd, &$ThisFileInfo, $avdataoffset, $BitrateHistogram=false)
 MPEGaudioVersionArray ()
 MPEGaudioLayerArray ()
 MPEGaudioBitrateArray ()
 MPEGaudioFrequencyArray ()
 MPEGaudioChannelModeArray ()
 MPEGaudioModeExtensionArray ()
 MPEGaudioEmphasisArray ()
 MPEGaudioHeaderBytesValid ($head4, $allowBitrate15=false)
 MPEGaudioHeaderValid ($rawarray, $echoerrors=false, $allowBitrate15=false)
 MPEGaudioHeaderDecode ($Header4Bytes)
 MPEGaudioFrameLength (&$bitrate, &$version, &$layer, $padding, &$samplerate)
 ClosestStandardMP3Bitrate ($bitrate)
 XingVBRidOffset ($version, $channelmode)
 LAMEvbrMethodLookup ($VBRmethodID)
 LAMEmiscStereoModeLookup ($StereoModeID)
 LAMEmiscSourceSampleFrequencyLookup ($SourceSampleFrequencyID)
 LAMEsurroundInfoLookup ($SurroundInfoID)
 LAMEpresetUsedLookup ($LAMEtag)

Data Fields

 $allow_bruteforce = false

Detailed Description

Definition at line 24 of file module.audio.mp3.php.

Member Function Documentation

getid3_mp3::ClosestStandardMP3Bitrate (   $bitrate)

Definition at line 1785 of file module.audio.mp3.php.

Referenced by decodeMPEGaudioHeader().

{
static $StandardBitrates = array(320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
static $BitrateTable = array(0=>'-');
$roundbitrate = intval(round($bitrate, -3));
if (!isset($BitrateTable[$roundbitrate])) {
if ($roundbitrate > 320000) {
$BitrateTable[$roundbitrate] = round($bitrate, -4);
} else {
$LastBitrate = 320000;
foreach ($StandardBitrates as $StandardBitrate) {
$BitrateTable[$roundbitrate] = $StandardBitrate;
if ($roundbitrate >= $StandardBitrate - (($LastBitrate - $StandardBitrate) / 2)) {
break;
}
$LastBitrate = $StandardBitrate;
}
}
}
return $BitrateTable[$roundbitrate];
}

+ Here is the caller graph for this function:

getid3_mp3::decodeMPEGaudioHeader (   $fd,
  $offset,
&  $ThisFileInfo,
  $recursivesearch = true,
  $ScanAsCBR = false,
  $FastMPEGheaderScan = false 
)

Definition at line 401 of file module.audio.mp3.php.

References getid3_lib\BigEndian2Int(), ClosestStandardMP3Bitrate(), FreeFormatFrameLength(), LAMEmiscSourceSampleFrequencyLookup(), LAMEmiscStereoModeLookup(), LAMEpresetUsedLookup(), LAMEsurroundInfoLookup(), LAMEvbrMethodLookup(), getid3_lib\LittleEndian2Float(), MPEGaudioBitrateArray(), MPEGaudioChannelModeArray(), MPEGaudioEmphasisArray(), MPEGaudioFrameLength(), MPEGaudioFrequencyArray(), MPEGaudioHeaderDecode(), MPEGaudioHeaderValid(), MPEGaudioLayerArray(), MPEGaudioModeExtensionArray(), MPEGaudioVersionArray(), RecursiveFrameScanning(), getid3_lib\RGADadjustmentLookup(), getid3_lib\RGADamplitude2dB(), getid3_lib\RGADnameLookup(), getid3_lib\RGADoriginatorLookup(), and XingVBRidOffset().

Referenced by getid3_mpeg\getid3_mpeg(), getOnlyMPEGaudioInfo(), and RecursiveFrameScanning().

{
static $MPEGaudioVersionLookup;
static $MPEGaudioLayerLookup;
static $MPEGaudioBitrateLookup;
static $MPEGaudioFrequencyLookup;
static $MPEGaudioChannelModeLookup;
static $MPEGaudioModeExtensionLookup;
static $MPEGaudioEmphasisLookup;
if (empty($MPEGaudioVersionLookup)) {
$MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
$MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
$MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
$MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray();
$MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray();
$MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray();
$MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray();
}
if ($offset >= $ThisFileInfo['avdataend']) {
$ThisFileInfo['error'][] = 'end of file encounter looking for MPEG synch';
return false;
}
fseek($fd, $offset, SEEK_SET);
//$headerstring = fread($fd, 1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame
$headerstring = fread($fd, 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);
static $MPEGaudioHeaderDecodeCache = array();
if (isset($MPEGaudioHeaderDecodeCache[$head4])) {
$MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4];
} else {
$MPEGheaderRawArray = getid3_mp3::MPEGaudioHeaderDecode($head4);
$MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray;
}
static $MPEGaudioHeaderValidCache = array();
// Not in cache
if (!isset($MPEGaudioHeaderValidCache[$head4])) {
//$MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1)
$MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false);
}
// shortcut
if (!isset($ThisFileInfo['mpeg']['audio'])) {
$ThisFileInfo['mpeg']['audio'] = array();
}
$thisfile_mpeg_audio = &$ThisFileInfo['mpeg']['audio'];
if ($MPEGaudioHeaderValidCache[$head4]) {
$thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
} else {
$ThisFileInfo['error'][] = 'Invalid MPEG audio header at offset '.$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']];
$ThisFileInfo['audio']['channels'] = $thisfile_mpeg_audio['channels'];
$ThisFileInfo['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
$ThisFileInfo['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 == $ThisFileInfo['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')) {
$ThisFileInfo['audio']['dataformat'] = 'mp2';
switch ($thisfile_mpeg_audio['channelmode']) {
case 'mono':
if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) {
// these are ok
} else {
$ThisFileInfo['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 {
$ThisFileInfo['error'][] = intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.';
return false;
}
break;
}
}
if ($ThisFileInfo['audio']['sample_rate'] > 0) {
$thisfile_mpeg_audio['framelength'] = getid3_mp3::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $ThisFileInfo['audio']['sample_rate']);
}
$nextframetestoffset = $offset + 1;
if ($thisfile_mpeg_audio['bitrate'] != 'free') {
$ThisFileInfo['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
if (isset($thisfile_mpeg_audio['framelength'])) {
$nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength'];
} else {
$ThisFileInfo['error'][] = 'Frame at offset('.$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';
$ThisFileInfo['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
$VBRidOffset = getid3_mp3::XingVBRidOffset($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'])) {
$framelengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames'];
if ($thisfile_mpeg_audio['layer'] == '1') {
// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
//$ThisFileInfo['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
$ThisFileInfo['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $ThisFileInfo['audio']['channels']) / 12;
} else {
// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
//$ThisFileInfo['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
$ThisFileInfo['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $ThisFileInfo['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);
if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
// extra 11 chars are not part of version string when LAMEtag present
unset($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;
$thisfile_mpeg_audio_lame['vbr_method'] = getid3_mp3::LAMEvbrMethodLookup($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'])) {
$ThisFileInfo['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
}
$ThisFileInfo['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
$ThisFileInfo['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'])) {
$ThisFileInfo['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
}
$ThisFileInfo['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
$ThisFileInfo['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'];
$thisfile_mpeg_audio_lame['stereo_mode'] = getid3_mp3::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
$thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
$thisfile_mpeg_audio_lame['source_sample_freq'] = getid3_mp3::LAMEmiscSourceSampleFrequencyLookup($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);
$thisfile_mpeg_audio_lame['surround_info'] = getid3_mp3::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
$thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF);
$thisfile_mpeg_audio_lame['preset_used'] = getid3_mp3::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
$ThisFileInfo['warning'][] = 'Unknown LAME preset used ('.$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';
$thisfile_mpeg_audio['bitrate'] = getid3_mp3::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
$ThisFileInfo['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) {
$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
if (getid3_mp3::RecursiveFrameScanning($fd, $ThisFileInfo, $offset, $nextframetestoffset, true)) {
$recursivesearch = false;
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
}
if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
$ThisFileInfo['warning'][] = 'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.';
}
}
}
}
if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']))) {
if ($ExpectedNumberOfAudioBytes > ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])) {
if (($ExpectedNumberOfAudioBytes - ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])) == 1) {
$ThisFileInfo['warning'][] = 'Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)';
} else {
$ThisFileInfo['warning'][] = 'Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])).' bytes)';
}
} else {
if ((($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) {
// $prenullbytefileoffset = ftell($fd);
// fseek($fd, $ThisFileInfo['avdataend'], SEEK_SET);
// $PossibleNullByte = fread($fd, 1);
// fseek($fd, $prenullbytefileoffset, SEEK_SET);
// if ($PossibleNullByte === "\x00") {
$ThisFileInfo['avdataend']--;
// $ThisFileInfo['warning'][] = 'Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored';
// } else {
// $ThisFileInfo['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' ('.(($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
// }
} else {
$ThisFileInfo['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' ('.(($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
}
}
}
if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($ThisFileInfo['audio']['bitrate'])) {
if (($offset == $ThisFileInfo['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
$framebytelength = getid3_mp3::FreeFormatFrameLength($fd, $offset, $ThisFileInfo, true);
if ($framebytelength > 0) {
$thisfile_mpeg_audio['framelength'] = $framebytelength;
if ($thisfile_mpeg_audio['layer'] == '1') {
// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
$ThisFileInfo['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
} else {
// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
$ThisFileInfo['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
}
} else {
$ThisFileInfo['error'][] = 'Error calculating frame length of free-format MP3 without Xing/LAME header';
}
}
}
if (!empty($thisfile_mpeg_audio['VBR_frames'])) {
switch ($thisfile_mpeg_audio['bitrate_mode']) {
case 'vbr':
case 'abr':
if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
$thisfile_mpeg_audio['VBR_bitrate'] = (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 384);
} elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
$thisfile_mpeg_audio['VBR_bitrate'] = (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 576);
} else {
$thisfile_mpeg_audio['VBR_bitrate'] = (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 1152);
}
if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {
$ThisFileInfo['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 (!getid3_mp3::RecursiveFrameScanning($fd, $ThisFileInfo, $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 < $ThisFileInfo['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 < $ThisFileInfo['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);
// $SideInfoOffset += 1;
// }
// $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
// $SideInfoOffset += 1;
// $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
// $SideInfoOffset += 1;
// }
// }
//}
return true;
}

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getid3_mp3::FreeFormatFrameLength (   $fd,
  $offset,
&  $ThisFileInfo,
  $deepscan = false 
)

Definition at line 1108 of file module.audio.mp3.php.

References getid3_lib\PrintHexBytes().

Referenced by decodeMPEGaudioHeader().

{
fseek($fd, $offset, SEEK_SET);
$MPEGaudioData = fread($fd, 32768);
$SyncPattern1 = substr($MPEGaudioData, 0, 4);
// may be different pattern due to padding
$SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) | 0x02).$SyncPattern1{3};
if ($SyncPattern2 === $SyncPattern1) {
$SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) & 0xFD).$SyncPattern1{3};
}
$framelength = false;
$framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4);
$framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4);
if ($framelength1 > 4) {
$framelength = $framelength1;
}
if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
$framelength = $framelength2;
}
if (!$framelength) {
// LAME 3.88 has a different value for modeextension on the first frame vs the rest
$framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4);
$framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4);
if ($framelength1 > 4) {
$framelength = $framelength1;
}
if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
$framelength = $framelength2;
}
if (!$framelength) {
$ThisFileInfo['error'][] = 'Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset;
return false;
} else {
$ThisFileInfo['warning'][] = 'ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)';
$ThisFileInfo['audio']['codec'] = 'LAME';
$ThisFileInfo['audio']['encoder'] = 'LAME3.88';
$SyncPattern1 = substr($SyncPattern1, 0, 3);
$SyncPattern2 = substr($SyncPattern2, 0, 3);
}
}
if ($deepscan) {
$ActualFrameLengthValues = array();
$nextoffset = $offset + $framelength;
while ($nextoffset < ($ThisFileInfo['avdataend'] - 6)) {
fseek($fd, $nextoffset - 1, SEEK_SET);
$NextSyncPattern = fread($fd, 6);
if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) {
// good - found where expected
$ActualFrameLengthValues[] = $framelength;
} elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) {
// ok - found one byte earlier than expected (last frame wasn't padded, first frame was)
$ActualFrameLengthValues[] = ($framelength - 1);
$nextoffset--;
} elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) {
// ok - found one byte later than expected (last frame was padded, first frame wasn't)
$ActualFrameLengthValues[] = ($framelength + 1);
$nextoffset++;
} else {
$ThisFileInfo['error'][] = 'Did not find expected free-format sync pattern at offset '.$nextoffset;
return false;
}
$nextoffset += $framelength;
}
if (count($ActualFrameLengthValues) > 0) {
$framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues)));
}
}
return $framelength;
}

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getid3_mp3::getid3_mp3 ( &  $fd,
&  $ThisFileInfo 
)

Definition at line 29 of file module.audio.mp3.php.

References getOnlyMPEGaudioInfo(), getOnlyMPEGaudioInfoBruteForce(), and GuessEncoderOptions().

{
if (!$this->getOnlyMPEGaudioInfo($fd, $ThisFileInfo, $ThisFileInfo['avdataoffset'])) {
if ($this->allow_bruteforce) {
$ThisFileInfo['error'][] = 'Rescanning file in BruteForce mode';
$this->getOnlyMPEGaudioInfoBruteForce($fd, $ThisFileInfo);
}
}
if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode'])) {
$ThisFileInfo['audio']['bitrate_mode'] = strtolower($ThisFileInfo['mpeg']['audio']['bitrate_mode']);
}
if (((isset($ThisFileInfo['id3v2']['headerlength']) && ($ThisFileInfo['avdataoffset'] > $ThisFileInfo['id3v2']['headerlength'])) || (!isset($ThisFileInfo['id3v2']) && ($ThisFileInfo['avdataoffset'] > 0)))) {
$synchoffsetwarning = 'Unknown data before synch ';
if (isset($ThisFileInfo['id3v2']['headerlength'])) {
$synchoffsetwarning .= '(ID3v2 header ends at '.$ThisFileInfo['id3v2']['headerlength'].', then '.($ThisFileInfo['avdataoffset'] - $ThisFileInfo['id3v2']['headerlength']).' bytes garbage, ';
} else {
$synchoffsetwarning .= '(should be at beginning of file, ';
}
$synchoffsetwarning .= 'synch detected at '.$ThisFileInfo['avdataoffset'].')';
if ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr') {
if (!empty($ThisFileInfo['id3v2']['headerlength']) && (($ThisFileInfo['avdataoffset'] - $ThisFileInfo['id3v2']['headerlength']) == $ThisFileInfo['mpeg']['audio']['framelength'])) {
$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';
$ThisFileInfo['audio']['codec'] = 'LAME';
$CurrentDataLAMEversionString = 'LAME3.';
} elseif (empty($ThisFileInfo['id3v2']['headerlength']) && ($ThisFileInfo['avdataoffset'] == $ThisFileInfo['mpeg']['audio']['framelength'])) {
$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';
$ThisFileInfo['audio']['codec'] = 'LAME';
$CurrentDataLAMEversionString = 'LAME3.';
}
}
$ThisFileInfo['warning'][] = $synchoffsetwarning;
}
if (isset($ThisFileInfo['mpeg']['audio']['LAME'])) {
$ThisFileInfo['audio']['codec'] = 'LAME';
if (!empty($ThisFileInfo['mpeg']['audio']['LAME']['long_version'])) {
$ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['mpeg']['audio']['LAME']['long_version'], "\x00");
} elseif (!empty($ThisFileInfo['mpeg']['audio']['LAME']['short_version'])) {
$ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['mpeg']['audio']['LAME']['short_version'], "\x00");
}
}
$CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : @$ThisFileInfo['audio']['encoder']);
if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) {
// a version number of LAME that does not end with a number like "LAME3.92"
// or with a closing parenthesis like "LAME3.88 (alpha)"
// or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)
// not sure what the actual last frame length will be, but will be less than or equal to 1441
$PossiblyLongerLAMEversion_FrameLength = 1441;
// Not sure what version of LAME this is - look in padding of last frame for longer version string
$PossibleLAMEversionStringOffset = $ThisFileInfo['avdataend'] - $PossiblyLongerLAMEversion_FrameLength;
fseek($fd, $PossibleLAMEversionStringOffset);
$PossiblyLongerLAMEversion_Data = fread($fd, $PossiblyLongerLAMEversion_FrameLength);
switch (substr($CurrentDataLAMEversionString, -1)) {
case 'a':
case 'b':
// "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example
// need to trim off "a" to match longer string
$CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1);
break;
}
if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false) {
if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) {
$PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
if (strlen($PossiblyLongerLAMEversion_NewString) > strlen(@$ThisFileInfo['audio']['encoder'])) {
$ThisFileInfo['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString;
}
}
}
}
if (!empty($ThisFileInfo['audio']['encoder'])) {
$ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['audio']['encoder'], "\x00 ");
}
switch (@$ThisFileInfo['mpeg']['audio']['layer']) {
case 1:
case 2:
$ThisFileInfo['audio']['dataformat'] = 'mp'.$ThisFileInfo['mpeg']['audio']['layer'];
break;
}
if ($ThisFileInfo['fileformat'] == 'mp3') {
switch ($ThisFileInfo['audio']['dataformat']) {
case 'mp1':
case 'mp2':
case 'mp3':
$ThisFileInfo['fileformat'] = $ThisFileInfo['audio']['dataformat'];
break;
default:
$ThisFileInfo['warning'][] = 'Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$ThisFileInfo['audio']['dataformat'].'"';
break;
}
}
if (empty($ThisFileInfo['fileformat'])) {
unset($ThisFileInfo['fileformat']);
unset($ThisFileInfo['audio']['bitrate_mode']);
unset($ThisFileInfo['avdataoffset']);
unset($ThisFileInfo['avdataend']);
return false;
}
$ThisFileInfo['mime_type'] = 'audio/mpeg';
$ThisFileInfo['audio']['lossless'] = false;
// Calculate playtime
if (!isset($ThisFileInfo['playtime_seconds']) && isset($ThisFileInfo['audio']['bitrate']) && ($ThisFileInfo['audio']['bitrate'] > 0)) {
$ThisFileInfo['playtime_seconds'] = ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8 / $ThisFileInfo['audio']['bitrate'];
}
$ThisFileInfo['audio']['encoder_options'] = $this->GuessEncoderOptions($ThisFileInfo);
return true;
}

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getid3_mp3::getOnlyMPEGaudioInfo (   $fd,
&  $ThisFileInfo,
  $avdataoffset,
  $BitrateHistogram = false 
)

Definition at line 1319 of file module.audio.mp3.php.

References decodeMPEGaudioHeader(), GETID3_FREAD_BUFFER_SIZE, MPEGaudioBitrateArray(), MPEGaudioLayerArray(), and MPEGaudioVersionArray().

Referenced by getid3_mp3(), getid3_quicktime\getid3_quicktime(), and getid3_riff\ParseRIFF().

{
// looks for synch, decodes MPEG audio header
fseek($fd, $avdataoffset, SEEK_SET);
$header = '';
$SynchSeekOffset = 0;
static $MPEGaudioVersionLookup;
static $MPEGaudioLayerLookup;
static $MPEGaudioBitrateLookup;
if (empty($MPEGaudioVersionLookup)) {
$MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
$MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
$MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
}
$header_len = strlen($header) - intval(round(GETID3_FREAD_BUFFER_SIZE / 2));
while (true) {
if (($SynchSeekOffset > $header_len) && (($avdataoffset + $SynchSeekOffset) < $ThisFileInfo['avdataend']) && !feof($fd)) {
if ($SynchSeekOffset > 131072) {
// if a synch's not found within the first 128k bytes, then give up
$ThisFileInfo['error'][] = 'could not find valid MPEG audio synch within the first 128k bytes';
if (isset($ThisFileInfo['audio']['bitrate'])) {
unset($ThisFileInfo['audio']['bitrate']);
}
if (isset($ThisFileInfo['mpeg']['audio'])) {
unset($ThisFileInfo['mpeg']['audio']);
}
if (empty($ThisFileInfo['mpeg'])) {
unset($ThisFileInfo['mpeg']);
}
return false;
} elseif ($header .= fread($fd, GETID3_FREAD_BUFFER_SIZE)) {
// great
$header_len = strlen($header) - intval(round(GETID3_FREAD_BUFFER_SIZE / 2));
} else {
$ThisFileInfo['error'][] = 'could not find valid MPEG audio synch before end of file';
if (isset($ThisFileInfo['audio']['bitrate'])) {
unset($ThisFileInfo['audio']['bitrate']);
}
if (isset($ThisFileInfo['mpeg']['audio'])) {
unset($ThisFileInfo['mpeg']['audio']);
}
if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || (count($ThisFileInfo['mpeg']) == 0))) {
unset($ThisFileInfo['mpeg']);
}
return false;
}
}
if (($SynchSeekOffset + 1) >= strlen($header)) {
$ThisFileInfo['error'][] = 'could not find valid MPEG synch before end of file';
return false;
}
if (($header{$SynchSeekOffset} == "\xFF") && ($header{($SynchSeekOffset + 1)} > "\xE0")) { // synch detected
if (!isset($FirstFrameThisfileInfo) && !isset($ThisFileInfo['mpeg']['audio'])) {
$FirstFrameThisfileInfo = $ThisFileInfo;
$FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $FirstFrameThisfileInfo, false)) {
// if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
// garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
unset($FirstFrameThisfileInfo);
}
}
$dummy = $ThisFileInfo; // only overwrite real data if valid header found
if (getid3_mp3::decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $dummy, true)) {
$ThisFileInfo = $dummy;
$ThisFileInfo['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
switch ($ThisFileInfo['fileformat']) {
case '':
case 'id3':
case 'ape':
case 'mp3':
$ThisFileInfo['fileformat'] = 'mp3';
$ThisFileInfo['audio']['dataformat'] = 'mp3';
break;
}
if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
if (!(abs($ThisFileInfo['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) {
// If there is garbage data between a valid VBR header frame and a sequence
// of valid MPEG-audio frames the VBR data is no longer discarded.
$ThisFileInfo = $FirstFrameThisfileInfo;
$ThisFileInfo['avdataoffset'] = $FirstFrameAVDataOffset;
$ThisFileInfo['fileformat'] = 'mp3';
$ThisFileInfo['audio']['dataformat'] = 'mp3';
$dummy = $ThisFileInfo;
unset($dummy['mpeg']['audio']);
$GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
$GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset;
if (getid3_mp3::decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) {
$ThisFileInfo = $dummy;
$ThisFileInfo['avdataoffset'] = $GarbageOffsetEnd;
$ThisFileInfo['warning'][] = 'apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd;
} else {
$ThisFileInfo['warning'][] = 'using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')';
}
}
}
if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode']) && ($ThisFileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($ThisFileInfo['mpeg']['audio']['VBR_method'])) {
// VBR file with no VBR header
$BitrateHistogram = true;
}
if ($BitrateHistogram) {
$ThisFileInfo['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);
$ThisFileInfo['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0);
if ($ThisFileInfo['mpeg']['audio']['version'] == '1') {
if ($ThisFileInfo['mpeg']['audio']['layer'] == 3) {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);
} elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 2) {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);
} elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);
}
} elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0, 176000=>0, 192000=>0, 224000=>0, 256000=>0);
} else {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 8000=>0, 16000=>0, 24000=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0);
}
$dummy = array('error'=>$ThisFileInfo['error'], 'warning'=>$ThisFileInfo['warning'], 'avdataend'=>$ThisFileInfo['avdataend'], 'avdataoffset'=>$ThisFileInfo['avdataoffset']);
$synchstartoffset = $ThisFileInfo['avdataoffset'];
$FastMode = false;
$SynchErrorsFound = 0;
while (getid3_mp3::decodeMPEGaudioHeader($fd, $synchstartoffset, $dummy, false, false, $FastMode)) {
$FastMode = true;
$thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
if (empty($dummy['mpeg']['audio']['framelength'])) {
$SynchErrorsFound++;
} else {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++;
$ThisFileInfo['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++;
$ThisFileInfo['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++;
$synchstartoffset += $dummy['mpeg']['audio']['framelength'];
}
}
if ($SynchErrorsFound > 0) {
$ThisFileInfo['warning'][] = 'Found '.$SynchErrorsFound.' synch errors in histogram analysis';
//return false;
}
$bittotal = 0;
$framecounter = 0;
foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
$framecounter += $bitratecount;
if ($bitratevalue != 'free') {
$bittotal += ($bitratevalue * $bitratecount);
}
}
if ($framecounter == 0) {
$ThisFileInfo['error'][] = 'Corrupt MP3 file: framecounter == zero';
return false;
}
$ThisFileInfo['mpeg']['audio']['frame_count'] = $framecounter;
$ThisFileInfo['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter);
$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate'];
// Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
$distinct_bitrates = 0;
foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
if ($bitrate_count > 0) {
$distinct_bitrates++;
}
}
if ($distinct_bitrates > 1) {
$ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'vbr';
} else {
$ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'cbr';
}
$ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['mpeg']['audio']['bitrate_mode'];
}
break; // exit while()
}
}
$SynchSeekOffset++;
if (($avdataoffset + $SynchSeekOffset) >= $ThisFileInfo['avdataend']) {
// end of file/data
if (empty($ThisFileInfo['mpeg']['audio'])) {
$ThisFileInfo['error'][] = 'could not find valid MPEG synch before end of file';
if (isset($ThisFileInfo['audio']['bitrate'])) {
unset($ThisFileInfo['audio']['bitrate']);
}
if (isset($ThisFileInfo['mpeg']['audio'])) {
unset($ThisFileInfo['mpeg']['audio']);
}
if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || empty($ThisFileInfo['mpeg']))) {
unset($ThisFileInfo['mpeg']);
}
return false;
}
break;
}
}
$ThisFileInfo['audio']['channels'] = $ThisFileInfo['mpeg']['audio']['channels'];
$ThisFileInfo['audio']['channelmode'] = $ThisFileInfo['mpeg']['audio']['channelmode'];
$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate'];
return true;
}

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getid3_mp3::getOnlyMPEGaudioInfoBruteForce (   $fd,
&  $ThisFileInfo 
)

Definition at line 1183 of file module.audio.mp3.php.

References getid3_lib\array_max(), MPEGaudioBitrateArray(), MPEGaudioChannelModeArray(), MPEGaudioEmphasisArray(), MPEGaudioFrameLength(), MPEGaudioFrequencyArray(), MPEGaudioHeaderDecode(), MPEGaudioHeaderValid(), MPEGaudioLayerArray(), MPEGaudioModeExtensionArray(), and MPEGaudioVersionArray().

Referenced by getid3_mp3().

{
$MPEGaudioHeaderDecodeCache = array();
$MPEGaudioHeaderValidCache = array();
$MPEGaudioHeaderLengthCache = array();
$MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
$MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
$MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
$MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray();
$MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray();
$MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray();
$MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray();
$LongMPEGversionLookup = array();
$LongMPEGlayerLookup = array();
$LongMPEGbitrateLookup = array();
$LongMPEGpaddingLookup = array();
$LongMPEGfrequencyLookup = array();
$Distribution['bitrate'] = array();
$Distribution['frequency'] = array();
$Distribution['layer'] = array();
$Distribution['version'] = array();
$Distribution['padding'] = array();
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
$previousvalidframe = $ThisFileInfo['avdataoffset'];
while (ftell($fd) < $ThisFileInfo['avdataend']) {
set_time_limit(30);
$head4 = fread($fd, 4);
if (strlen($head4) < 4) {
break;
}
if ($head4{0} != "\xFF") {
for ($i = 1; $i < 4; $i++) {
if ($head4{$i} == "\xFF") {
fseek($fd, $i - 4, SEEK_CUR);
continue 2;
}
}
continue;
}
if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {
$MPEGaudioHeaderDecodeCache[$head4] = getid3_mp3::MPEGaudioHeaderDecode($head4);
}
if (!isset($MPEGaudioHeaderValidCache[$head4])) {
$MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false);
}
if ($MPEGaudioHeaderValidCache[$head4]) {
if (!isset($MPEGaudioHeaderLengthCache[$head4])) {
$LongMPEGversionLookup[$head4] = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']];
$LongMPEGlayerLookup[$head4] = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']];
$LongMPEGbitrateLookup[$head4] = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']];
$LongMPEGpaddingLookup[$head4] = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding'];
$LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']];
$MPEGaudioHeaderLengthCache[$head4] = getid3_mp3::MPEGaudioFrameLength(
$LongMPEGbitrateLookup[$head4],
$LongMPEGversionLookup[$head4],
$LongMPEGlayerLookup[$head4],
$LongMPEGpaddingLookup[$head4],
$LongMPEGfrequencyLookup[$head4]);
}
if ($MPEGaudioHeaderLengthCache[$head4] > 4) {
$WhereWeWere = ftell($fd);
fseek($fd, $MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR);
$next4 = fread($fd, 4);
if ($next4{0} == "\xFF") {
if (!isset($MPEGaudioHeaderDecodeCache[$next4])) {
$MPEGaudioHeaderDecodeCache[$next4] = getid3_mp3::MPEGaudioHeaderDecode($next4);
}
if (!isset($MPEGaudioHeaderValidCache[$next4])) {
$MPEGaudioHeaderValidCache[$next4] = getid3_mp3::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false);
}
if ($MPEGaudioHeaderValidCache[$next4]) {
fseek($fd, -4, SEEK_CUR);
@$Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]++;
@$Distribution['layer'][$LongMPEGlayerLookup[$head4]]++;
@$Distribution['version'][$LongMPEGversionLookup[$head4]]++;
@$Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]++;
@$Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]++;
continue;
}
}
unset($next4);
fseek($fd, $WhereWeWere - 3, SEEK_SET);
}
}
}
foreach ($Distribution as $key => $value) {
ksort($Distribution[$key], SORT_NUMERIC);
}
ksort($Distribution['version'], SORT_STRING);
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate'];
$ThisFileInfo['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency'];
$ThisFileInfo['mpeg']['audio']['layer_distribution'] = $Distribution['layer'];
$ThisFileInfo['mpeg']['audio']['version_distribution'] = $Distribution['version'];
$ThisFileInfo['mpeg']['audio']['padding_distribution'] = $Distribution['padding'];
if (count($Distribution['version']) > 1) {
$ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG version detected';
}
if (count($Distribution['layer']) > 1) {
$ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG layer detected';
}
if (count($Distribution['frequency']) > 1) {
$ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG sample rate detected';
}
$bittotal = 0;
foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) {
if ($bitratevalue != 'free') {
$bittotal += ($bitratevalue * $bitratecount);
}
}
$ThisFileInfo['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']);
if ($ThisFileInfo['mpeg']['audio']['frame_count'] == 0) {
$ThisFileInfo['error'][] = 'no MPEG audio frames found';
return false;
}
$ThisFileInfo['mpeg']['audio']['bitrate'] = ($bittotal / $ThisFileInfo['mpeg']['audio']['frame_count']);
$ThisFileInfo['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr');
$ThisFileInfo['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true);
$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate'];
$ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['mpeg']['audio']['bitrate_mode'];
$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate'];
$ThisFileInfo['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true);
$ThisFileInfo['fileformat'] = $ThisFileInfo['audio']['dataformat'];
return true;
}

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getid3_mp3::GuessEncoderOptions ( &  $ThisFileInfo)

Definition at line 158 of file module.audio.mp3.php.

Referenced by getid3_mp3(), and getid3_riff\getid3_riff().

{
// shortcuts
if (!empty($ThisFileInfo['mpeg']['audio'])) {
$thisfile_mpeg_audio = &$ThisFileInfo['mpeg']['audio'];
if (!empty($thisfile_mpeg_audio['LAME'])) {
$thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
}
}
$encoder_options = '';
static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256);
if ((@$thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) {
$encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality'];
} elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $NamedPresetBitrates))) {
$encoder_options = $thisfile_mpeg_audio_lame['preset_used'];
} elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {
static $KnownEncoderValues = array();
if (empty($KnownEncoderValues)) {
//$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name';
$KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92
$KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91
$KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95
$KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92
$KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91
$KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3
$KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92
$KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91
$KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
$KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3
$KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
$KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3
$KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92
$KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91
$KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95
$KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3
$KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3
$KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
$KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1
$KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93
$KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95
$KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
$KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1
$KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93
$KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95
$KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
$KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1
$KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95
$KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
$KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
$KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
$KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1
$KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95
$KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1
$KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95
$KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14
$KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92
$KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91
$KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1
$KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95
$KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14
$KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15
$KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1
$KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93
$KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95
$KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14
$KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15
$KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1
$KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93
$KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95
}
if (isset($KnownEncoderValues[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']])) {
$encoder_options = $KnownEncoderValues[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
} elseif (isset($KnownEncoderValues['**'][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']])) {
$encoder_options = $KnownEncoderValues['**'][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
} elseif ($ThisFileInfo['audio']['bitrate_mode'] == 'vbr') {
// http://gabriel.mp3-tech.org/mp3infotag.html
// int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h
$LAME_V_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10);
$LAME_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($LAME_V_value * 10);
$encoder_options = '-V'.$LAME_V_value.' -q'.$LAME_q_value;
} elseif ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr') {
$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000);
} else {
$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']);
}
} elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) {
$encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr'];
} elseif (!empty($ThisFileInfo['audio']['bitrate'])) {
if ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr') {
$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000);
} else {
$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']);
}
}
if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) {
$encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min'];
}
if (@$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] || @$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']) {
$encoder_options .= ' --nogap';
}
if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {
$ExplodedOptions = explode(' ', $encoder_options, 4);
if ($ExplodedOptions[0] == '--r3mix') {
$ExplodedOptions[1] = 'r3mix';
}
switch ($ExplodedOptions[0]) {
case '--preset':
case '--alt-preset':
case '--r3mix':
if ($ExplodedOptions[1] == 'fast') {
$ExplodedOptions[1] .= ' '.$ExplodedOptions[2];
}
switch ($ExplodedOptions[1]) {
case 'portable':
case 'medium':
case 'standard':
case 'extreme':
case 'insane':
case 'fast portable':
case 'fast medium':
case 'fast standard':
case 'fast extreme':
case 'fast insane':
case 'r3mix':
static $ExpectedLowpass = array(
'insane|20500' => 20500,
'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91
'medium|18000' => 18000,
'fast medium|18000' => 18000,
'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
'standard|19000' => 19000,
'fast standard|19000' => 19000,
'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92
'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91
'r3mix|18000' => 18000, // 3.94, 3.95
);
if (!isset($ExpectedLowpass[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio_lame['lowpass_frequency']]) && ($thisfile_mpeg_audio_lame['lowpass_frequency'] < 22050) && (round($thisfile_mpeg_audio_lame['lowpass_frequency'] / 1000) < round($thisfile_mpeg_audio['sample_rate'] / 2000))) {
$encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency'];
}
break;
default:
break;
}
break;
}
}
if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) {
if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) {
$encoder_options .= ' --resample 44100';
} elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) {
$encoder_options .= ' --resample 48000';
} elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) {
switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) {
case 0: // <= 32000
// may or may not be same as source frequency - ignore
break;
case 1: // 44100
case 2: // 48000
case 3: // 48000+
$ExplodedOptions = explode(' ', $encoder_options, 4);
switch ($ExplodedOptions[0]) {
case '--preset':
case '--alt-preset':
switch ($ExplodedOptions[1]) {
case 'fast':
case 'portable':
case 'medium':
case 'standard':
case 'extreme':
case 'insane':
$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
break;
default:
static $ExpectedResampledRate = array(
'phon+/lw/mw-eu/sw|16000' => 16000,
'mw-us|24000' => 24000, // 3.95
'mw-us|32000' => 32000, // 3.93
'mw-us|16000' => 16000, // 3.92
'phone|16000' => 16000,
'phone|11025' => 11025, // 3.94a15
'radio|32000' => 32000, // 3.94a15
'fm/radio|32000' => 32000, // 3.92
'fm|32000' => 32000, // 3.90
'voice|32000' => 32000);
if (!isset($ExpectedResampledRate[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio['sample_rate']])) {
$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
}
break;
}
break;
case '--r3mix':
default:
$encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
break;
}
break;
}
}
}
if (empty($encoder_options) && !empty($ThisFileInfo['audio']['bitrate']) && !empty($ThisFileInfo['audio']['bitrate_mode'])) {
//$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000);
$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']);
}
return $encoder_options;
}

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getid3_mp3::LAMEmiscSourceSampleFrequencyLookup (   $SourceSampleFrequencyID)

Definition at line 1862 of file module.audio.mp3.php.

Referenced by decodeMPEGaudioHeader().

{
static $LAMEmiscSourceSampleFrequencyLookup = array(
0 => '<= 32 kHz',
1 => '44.1 kHz',
2 => '48 kHz',
3 => '> 48kHz'
);
return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
}

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getid3_mp3::LAMEmiscStereoModeLookup (   $StereoModeID)

Definition at line 1848 of file module.audio.mp3.php.

Referenced by decodeMPEGaudioHeader().

{
static $LAMEmiscStereoModeLookup = array(
0 => 'mono',
1 => 'stereo',
2 => 'dual mono',
3 => 'joint stereo',
4 => 'forced stereo',
5 => 'auto',
6 => 'intensity stereo',
7 => 'other'
);
return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : '');
}

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getid3_mp3::LAMEpresetUsedLookup (   $LAMEtag)

Definition at line 1882 of file module.audio.mp3.php.

Referenced by decodeMPEGaudioHeader().

{
if ($LAMEtag['preset_used_id'] == 0) {
// no preset used (LAME >=3.93)
// no preset recorded (LAME <3.93)
return '';
}
$LAMEpresetUsedLookup = array();
for ($i = 8; $i <= 320; $i++) {
switch ($LAMEtag['vbr_method']) {
case 'cbr':
$LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i;
break;
case 'abr':
default: // other VBR modes shouldn't be here(?)
$LAMEpresetUsedLookup[$i] = '--alt-preset '.$i;
break;
}
}
// named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()
// named alt-presets
$LAMEpresetUsedLookup[1000] = '--r3mix';
$LAMEpresetUsedLookup[1001] = '--alt-preset standard';
$LAMEpresetUsedLookup[1002] = '--alt-preset extreme';
$LAMEpresetUsedLookup[1003] = '--alt-preset insane';
$LAMEpresetUsedLookup[1004] = '--alt-preset fast standard';
$LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme';
$LAMEpresetUsedLookup[1006] = '--alt-preset medium';
$LAMEpresetUsedLookup[1007] = '--alt-preset fast medium';
// LAME 3.94 additions/changes
$LAMEpresetUsedLookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003
$LAMEpresetUsedLookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003
$LAMEpresetUsedLookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003
$LAMEpresetUsedLookup[410] = '-V9';
$LAMEpresetUsedLookup[420] = '-V8';
$LAMEpresetUsedLookup[440] = '-V6';
$LAMEpresetUsedLookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003
$LAMEpresetUsedLookup[450] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003
$LAMEpresetUsedLookup[460] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003
$LAMEpresetUsedLookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003
$LAMEpresetUsedLookup[480] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003
$LAMEpresetUsedLookup[490] = '-V1';
$LAMEpresetUsedLookup[500] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003
return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org');
}

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getid3_mp3::LAMEsurroundInfoLookup (   $SurroundInfoID)

Definition at line 1872 of file module.audio.mp3.php.

Referenced by decodeMPEGaudioHeader().

{
static $LAMEsurroundInfoLookup = array(
0 => 'no surround info',
1 => 'DPL encoding',
2 => 'DPL2 encoding',
3 => 'Ambisonic encoding'
);
return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved');
}

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getid3_mp3::LAMEvbrMethodLookup (   $VBRmethodID)

Definition at line 1832 of file module.audio.mp3.php.

Referenced by decodeMPEGaudioHeader().

{
static $LAMEvbrMethodLookup = array(
0x00 => 'unknown',
0x01 => 'cbr',
0x02 => 'abr',
0x03 => 'vbr-old / vbr-rh',
0x04 => 'vbr-new / vbr-mtrh',
0x05 => 'vbr-mt',
0x06 => 'Full VBR Method 4',
0x08 => 'constant bitrate 2 pass',
0x09 => 'abr 2 pass',
0x0F => 'reserved'
);
return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : '');
}

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getid3_mp3::MPEGaudioBitrateArray ( )

Definition at line 1558 of file module.audio.mp3.php.

Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfo(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().

{
static $MPEGaudioBitrate;
if (empty($MPEGaudioBitrate)) {
$MPEGaudioBitrate = array (
'1' => array (1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000),
2 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000),
3 => array('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000)
),
'2' => array (1 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000),
2 => array('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000),
)
);
$MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2];
$MPEGaudioBitrate['2.5'] = $MPEGaudioBitrate['2'];
}
return $MPEGaudioBitrate;
}

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getid3_mp3::MPEGaudioChannelModeArray ( )

Definition at line 1589 of file module.audio.mp3.php.

Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().

{
static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono');
return $MPEGaudioChannelMode;
}

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getid3_mp3::MPEGaudioEmphasisArray ( )

Definition at line 1606 of file module.audio.mp3.php.

Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().

{
static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17');
return $MPEGaudioEmphasis;
}

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getid3_mp3::MPEGaudioFrameLength ( &  $bitrate,
&  $version,
&  $layer,
  $padding,
&  $samplerate 
)

Definition at line 1724 of file module.audio.mp3.php.

Referenced by decodeMPEGaudioHeader(), and getOnlyMPEGaudioInfoBruteForce().

{
static $AudioFrameLengthCache = array();
if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) {
$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false;
if ($bitrate != 'free') {
if ($version == '1') {
if ($layer == '1') {
// For Layer I slot is 32 bits long
$FrameLengthCoefficient = 48;
$SlotLength = 4;
} else { // Layer 2 / 3
// for Layer 2 and Layer 3 slot is 8 bits long.
$FrameLengthCoefficient = 144;
$SlotLength = 1;
}
} else { // MPEG-2 / MPEG-2.5
if ($layer == '1') {
// For Layer I slot is 32 bits long
$FrameLengthCoefficient = 24;
$SlotLength = 4;
} elseif ($layer == '2') {
// for Layer 2 and Layer 3 slot is 8 bits long.
$FrameLengthCoefficient = 144;
$SlotLength = 1;
} else { // layer 3
// for Layer 2 and Layer 3 slot is 8 bits long.
$FrameLengthCoefficient = 72;
$SlotLength = 1;
}
}
// FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
if ($samplerate > 0) {
$NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate;
$NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)
if ($padding) {
$NewFramelength += $SlotLength;
}
$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
}
}
}
return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
}

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getid3_mp3::MPEGaudioFrequencyArray ( )

Definition at line 1577 of file module.audio.mp3.php.

Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().

{
static $MPEGaudioFrequency;
if (empty($MPEGaudioFrequency)) {
$MPEGaudioFrequency = array (
'1' => array(44100, 48000, 32000),
'2' => array(22050, 24000, 16000),
'2.5' => array(11025, 12000, 8000)
);
}
return $MPEGaudioFrequency;
}

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getid3_mp3::MPEGaudioHeaderBytesValid (   $head4,
  $allowBitrate15 = false 
)

Definition at line 1611 of file module.audio.mp3.php.

References MPEGaudioHeaderDecode(), and MPEGaudioHeaderValid().

Referenced by getid3_riff\ParseRIFF().

{
return getid3_mp3::MPEGaudioHeaderValid(getid3_mp3::MPEGaudioHeaderDecode($head4), false, $allowBitrate15);
}

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getid3_mp3::MPEGaudioHeaderDecode (   $Header4Bytes)

Definition at line 1687 of file module.audio.mp3.php.

References getid3_lib\BigEndian2Int().

Referenced by decodeMPEGaudioHeader(), getid3_quicktime\getid3_quicktime(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderBytesValid().

{
// AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM
// A - Frame sync (all bits set)
// B - MPEG Audio version ID
// C - Layer description
// D - Protection bit
// E - Bitrate index
// F - Sampling rate frequency index
// G - Padding bit
// H - Private bit
// I - Channel Mode
// J - Mode extension (Only if Joint stereo)
// K - Copyright
// L - Original
// M - Emphasis
if (strlen($Header4Bytes) != 4) {
return false;
}
$MPEGrawHeader['synch'] = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4;
$MPEGrawHeader['version'] = (ord($Header4Bytes{1}) & 0x18) >> 3; // BB
$MPEGrawHeader['layer'] = (ord($Header4Bytes{1}) & 0x06) >> 1; // CC
$MPEGrawHeader['protection'] = (ord($Header4Bytes{1}) & 0x01); // D
$MPEGrawHeader['bitrate'] = (ord($Header4Bytes{2}) & 0xF0) >> 4; // EEEE
$MPEGrawHeader['sample_rate'] = (ord($Header4Bytes{2}) & 0x0C) >> 2; // FF
$MPEGrawHeader['padding'] = (ord($Header4Bytes{2}) & 0x02) >> 1; // G
$MPEGrawHeader['private'] = (ord($Header4Bytes{2}) & 0x01); // H
$MPEGrawHeader['channelmode'] = (ord($Header4Bytes{3}) & 0xC0) >> 6; // II
$MPEGrawHeader['modeextension'] = (ord($Header4Bytes{3}) & 0x30) >> 4; // JJ
$MPEGrawHeader['copyright'] = (ord($Header4Bytes{3}) & 0x08) >> 3; // K
$MPEGrawHeader['original'] = (ord($Header4Bytes{3}) & 0x04) >> 2; // L
$MPEGrawHeader['emphasis'] = (ord($Header4Bytes{3}) & 0x03); // MM
return $MPEGrawHeader;
}

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getid3_mp3::MPEGaudioHeaderValid (   $rawarray,
  $echoerrors = false,
  $allowBitrate15 = false 
)

Definition at line 1615 of file module.audio.mp3.php.

References MPEGaudioBitrateArray(), MPEGaudioChannelModeArray(), MPEGaudioEmphasisArray(), MPEGaudioFrequencyArray(), MPEGaudioLayerArray(), MPEGaudioModeExtensionArray(), and MPEGaudioVersionArray().

Referenced by decodeMPEGaudioHeader(), getid3_quicktime\getid3_quicktime(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderBytesValid().

{
if (($rawarray['synch'] & 0x0FFE) != 0x0FFE) {
return false;
}
static $MPEGaudioVersionLookup;
static $MPEGaudioLayerLookup;
static $MPEGaudioBitrateLookup;
static $MPEGaudioFrequencyLookup;
static $MPEGaudioChannelModeLookup;
static $MPEGaudioModeExtensionLookup;
static $MPEGaudioEmphasisLookup;
if (empty($MPEGaudioVersionLookup)) {
$MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
$MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
$MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
$MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray();
$MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray();
$MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray();
$MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray();
}
if (isset($MPEGaudioVersionLookup[$rawarray['version']])) {
$decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']];
} else {
echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : '');
return false;
}
if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) {
$decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']];
} else {
echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : '');
return false;
}
if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) {
echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : '');
if ($rawarray['bitrate'] == 15) {
// known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0
// let it go through here otherwise file will not be identified
if (!$allowBitrate15) {
return false;
}
} else {
return false;
}
}
if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) {
echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : '');
return false;
}
if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) {
echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : '');
return false;
}
if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) {
echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : '');
return false;
}
if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) {
echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : '');
return false;
}
// These are just either set or not set, you can't mess that up :)
// $rawarray['protection'];
// $rawarray['padding'];
// $rawarray['private'];
// $rawarray['copyright'];
// $rawarray['original'];
return true;
}

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getid3_mp3::MPEGaudioLayerArray ( )

Definition at line 1553 of file module.audio.mp3.php.

Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfo(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().

{
static $MPEGaudioLayer = array(false, 3, 2, 1);
return $MPEGaudioLayer;
}

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getid3_mp3::MPEGaudioModeExtensionArray ( )

Definition at line 1594 of file module.audio.mp3.php.

Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().

{
static $MPEGaudioModeExtension;
if (empty($MPEGaudioModeExtension)) {
$MPEGaudioModeExtension = array (
1 => array('4-31', '8-31', '12-31', '16-31'),
2 => array('4-31', '8-31', '12-31', '16-31'),
3 => array('', 'IS', 'MS', 'IS+MS')
);
}
return $MPEGaudioModeExtension;
}

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getid3_mp3::MPEGaudioVersionArray ( )

Definition at line 1548 of file module.audio.mp3.php.

Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfo(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().

{
static $MPEGaudioVersion = array('2.5', false, '2', '1');
return $MPEGaudioVersion;
}

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getid3_mp3::RecursiveFrameScanning ( &  $fd,
&  $ThisFileInfo,
&  $offset,
&  $nextframetestoffset,
  $ScanAsCBR 
)

Definition at line 1070 of file module.audio.mp3.php.

References decodeMPEGaudioHeader(), and GETID3_MP3_VALID_CHECK_FRAMES.

Referenced by decodeMPEGaudioHeader().

{
for ($i = 0; $i < GETID3_MP3_VALID_CHECK_FRAMES; $i++) {
// check next GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch
if (($nextframetestoffset + 4) >= $ThisFileInfo['avdataend']) {
// end of file
return true;
}
$nextframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$ThisFileInfo['avdataend'], 'avdataoffset'=>$ThisFileInfo['avdataoffset']);
if (getid3_mp3::decodeMPEGaudioHeader($fd, $nextframetestoffset, $nextframetestarray, false)) {
if ($ScanAsCBR) {
// force CBR mode, used for trying to pick out invalid audio streams with
// valid(?) VBR headers, or VBR streams with no VBR header
if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($ThisFileInfo['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $ThisFileInfo['mpeg']['audio']['bitrate'])) {
return false;
}
}
// next frame is OK, get ready to check the one after that
if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) {
$nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength'];
} else {
$ThisFileInfo['error'][] = 'Frame at offset ('.$offset.') is has an invalid frame length.';
return false;
}
} else {
// next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence
$ThisFileInfo['error'][] = 'Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.';
return false;
}
}
return true;
}

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getid3_mp3::XingVBRidOffset (   $version,
  $channelmode 
)

Definition at line 1806 of file module.audio.mp3.php.

Referenced by decodeMPEGaudioHeader().

{
static $XingVBRidOffsetCache = array();
if (empty($XingVBRidOffset)) {
$XingVBRidOffset = array (
'1' => array ('mono' => 0x15, // 4 + 17 = 21
'stereo' => 0x24, // 4 + 32 = 36
'joint stereo' => 0x24,
'dual channel' => 0x24
),
'2' => array ('mono' => 0x0D, // 4 + 9 = 13
'stereo' => 0x15, // 4 + 17 = 21
'joint stereo' => 0x15,
'dual channel' => 0x15
),
'2.5' => array ('mono' => 0x15,
'stereo' => 0x15,
'joint stereo' => 0x15,
'dual channel' => 0x15
)
);
}
return $XingVBRidOffset[$version][$channelmode];
}

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Field Documentation

getid3_mp3::$allow_bruteforce = false

Definition at line 27 of file module.audio.mp3.php.

The documentation for this class was generated from the following file: