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module.audio.mp3.php
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module.audio.mp3.php
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<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at http://getid3.sourceforge.net //
// or http://www.getid3.org //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.audio.mp3.php //
// module for analyzing MP3 files //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////
// number of frames to scan to determine if MPEG-audio sequence is valid
// Lower this number to 5-20 for faster scanning
// Increase this number to 50+ for most accurate detection of valid VBR/CBR
// mpeg-audio streams
define('GETID3_MP3_VALID_CHECK_FRAMES', 35);
class getid3_mp3
{
var $allow_bruteforce = false; // forces getID3() to scan the file byte-by-byte and log all the valid audio frame headers - extremely slow, unrecommended, but may provide data from otherwise-unusuable files
function getid3_mp3(&$fd, &$ThisFileInfo) {
if (!$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;
}
function GuessEncoderOptions(&$ThisFileInfo) {
// shortcuts
if (!empty($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 $encoder_options;
}
function decodeMPEGaudioHeader($fd, $offset, &$ThisFileInfo, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=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();
$MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray();
}
if ($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'] - $ThisFileInfo['avdataoffset'])) {
if (@$ThisFileInfo['fileformat'] == 'riff') {
// ignore, audio data is broken into chunks so will always be data "missing"
} elseif (($ExpectedNumberOfAudioBytes - ($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 {
$ThisFileInfo['error'][] = 'Error calculating frame length of free-format MP3 without Xing/LAME header';
}
}
}
if (@$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++) {