| <Website> | getID3 |  |
|
| Size: | 71712 |
| Storage flags: | strip |
<?php
define('GETID3_MP3_VALID_CHECK_FRAMES', 35);
class getid3_mp3 extends getid3_handler
{
public $allow_bruteforce = false;
public function Analyze() {
$info = &$this->getid3->info;
$initialOffset = $info['avdataoffset'];
if (!$this->getOnlyMPEGaudioInfo($info['avdataoffset'])) {
if ($this->allow_bruteforce) {
$info['error'][] = 'Rescanning file in BruteForce mode';
$this->getOnlyMPEGaudioInfoBruteForce($this->getid3->fp, $info);
}
}
if (isset($info['mpeg']['audio']['bitrate_mode'])) {
$info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);
}
if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0) && ($info['avdataoffset'] != $initialOffset)))) {
$synchoffsetwarning = 'Unknown data before synch ';
if (isset($info['id3v2']['headerlength'])) {
$synchoffsetwarning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, ';
} elseif ($initialOffset > 0) {
$synchoffsetwarning .= '(should be at '.$initialOffset.', ';
} else {
$synchoffsetwarning .= '(should be at beginning of file, ';
}
$synchoffsetwarning .= 'synch detected at '.$info['avdataoffset'].')';
if (isset($info['audio']['bitrate_mode']) && ($info['audio']['bitrate_mode'] == 'cbr')) {
if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) {
$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';
$info['audio']['codec'] = 'LAME';
$CurrentDataLAMEversionString = 'LAME3.';
} elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) {
$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';
$info['audio']['codec'] = 'LAME';
$CurrentDataLAMEversionString = 'LAME3.';
}
}
$info['warning'][] = $synchoffsetwarning;
}
if (isset($info['mpeg']['audio']['LAME'])) {
$info['audio']['codec'] = 'LAME';
if (!empty($info['mpeg']['audio']['LAME']['long_version'])) {
$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00");
} elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) {
$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00");
}
}
$CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : (isset($info['audio']['encoder']) ? $info['audio']['encoder'] : ''));
if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) {
$PossiblyLongerLAMEversion_FrameLength = 1441;
$PossibleLAMEversionStringOffset = $info['avdataend'] - $PossiblyLongerLAMEversion_FrameLength;
$this->fseek($PossibleLAMEversionStringOffset);
$PossiblyLongerLAMEversion_Data = $this->fread($PossiblyLongerLAMEversion_FrameLength);
switch (substr($CurrentDataLAMEversionString, -1)) {
case 'a':
case 'b':
$CurrentDataLAMEversionString = substr($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($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)'));
if (empty($info['audio']['encoder']) || (strlen($PossiblyLongerLAMEversion_NewString) > strlen($info['audio']['encoder']))) {
$info['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString;
}
}
}
}
if (!empty($info['audio']['encoder'])) {
$info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 ");
}
switch (isset($info['mpeg']['audio']['layer']) ? $info['mpeg']['audio']['layer'] : '') {
case 1:
case 2:
$info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer'];
break;
}
if (isset($info['fileformat']) && ($info['fileformat'] == 'mp3')) {
switch ($info['audio']['dataformat']) {
case 'mp1':
case 'mp2':
case 'mp3':
$info['fileformat'] = $info['audio']['dataformat'];
break;
default:
$info['warning'][] = 'Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"';
break;
}
}
if (empty($info['fileformat'])) {
unset($info['fileformat']);
unset($info['audio']['bitrate_mode']);
unset($info['avdataoffset']);
unset($info['avdataend']);
return false;
}
$info['mime_type'] = 'audio/mpeg';
$info['audio']['lossless'] = false;
if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) {
$info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['audio']['bitrate'];
}
$info['audio']['encoder_options'] = $this->GuessEncoderOptions();
return true;
}
public function GuessEncoderOptions() {
$info = &$this->getid3->info;
if (!empty($info['mpeg']['audio'])) {
$thisfile_mpeg_audio = &$info['mpeg']['audio'];
if (!empty($thisfile_mpeg_audio['LAME'])) {
$thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
}
}
$encoder_options = '';
static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256);
if (isset($thisfile_mpeg_audio['VBR_method']) && ($thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($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[0xFF][58][1][1][3][2][20500] = '--alt-preset insane';
$KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane';
$KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane';
$KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme';
$KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme';
$KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme';
$KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme';
$KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme';
$KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard';
$KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard';
$KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard';
$KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard';
$KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix';
$KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix';
$KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix';
$KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium';
$KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium';
$KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio';
$KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio';
$KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio';
$KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio';
$KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd';
$KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd';
$KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd';
$KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd';
$KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi';
$KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi';
$KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi';
$KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape';
$KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio';
$KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm';
$KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm';
$KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm';
$KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice';
$KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice';
$KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice';
$KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us';
$KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us';
$KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us';
$KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us';
$KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us';
$KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us';
$KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw';
$KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw';
$KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw';
$KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw';
$KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw';
$KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone';
$KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone';
$KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone';
}
if (isset($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']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
} elseif ($info['audio']['bitrate_mode'] == 'vbr') {
$LAME_V_value = 10 - ceil($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'.$LAME_q_value;
} elseif ($info['audio']['bitrate_mode'] == 'cbr') {
$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
} else {
$encoder_options = strtoupper($info['audio']['bitrate_mode']);
}
} elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) {
$encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr'];
} elseif (!empty($info['audio']['bitrate'])) {
if ($info['audio']['bitrate_mode'] == 'cbr') {
$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
} else {
$encoder_options = strtoupper($info['audio']['bitrate_mode']);
}
}
if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) {
$encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min'];
}
if (!empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']) || !empty($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 $ExpectedLowpass = array(
'insane|20500' => 20500,
'insane|20600' => 20600,
'medium|18000' => 18000,
'fast medium|18000' => 18000,
'extreme|19500' => 19500,
'extreme|19600' => 19600,
'fast extreme|19500' => 19500,
'fast extreme|19600' => 19600,
'standard|19000' => 19000,
'fast standard|19000' => 19000,
'r3mix|19500' => 19500,
'r3mix|19600' => 19600,
'r3mix|18000' => 18000,
);
if (!isset($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:
break;
case 1:
case 2:
case 3:
$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 $ExpectedResampledRate = array(
'phon+/lw/mw-eu/sw|16000' => 16000,
'mw-us|24000' => 24000,
'mw-us|32000' => 32000,
'mw-us|16000' => 16000,
'phone|16000' => 16000,
'phone|11025' => 11025,
'radio|32000' => 32000,
'fm/radio|32000' => 32000,
'fm|32000' => 32000,
'voice|32000' => 32000);
if (!isset($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($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) {
$encoder_options = strtoupper($info['audio']['bitrate_mode']);
}
return $encoder_options;
}
public function decodeMPEGaudioHeader($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) {
static $MPEGaudioVersionLookup;
static $MPEGaudioLayerLookup;
static $MPEGaudioBitrateLookup;
static $MPEGaudioFrequencyLookup;
static $MPEGaudioChannelModeLookup;
static $MPEGaudioModeExtensionLookup;
static $MPEGaudioEmphasisLookup;
if (empty($MPEGaudioVersionLookup)) {
$MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
$MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
$MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
$MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
$MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
}
if ($this->fseek($offset) != 0) {
$info['error'][] = 'decodeMPEGaudioHeader() failed to seek to next offset at '.$offset;
return false;
}
$headerstring = $this->fread(226);
$head4 = substr($headerstring, 0, 4);
static $MPEGaudioHeaderDecodeCache = array();
if (isset($MPEGaudioHeaderDecodeCache[$head4])) {
$MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4];
} else {
$MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4);
$MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray;
}
static $MPEGaudioHeaderValidCache = array();
if (!isset($MPEGaudioHeaderValidCache[$head4])) {
$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false);
}
if (!isset($info['mpeg']['audio'])) {
$info['mpeg']['audio'] = array();
}
$thisfile_mpeg_audio = &$info['mpeg']['audio'];
if ($MPEGaudioHeaderValidCache[$head4]) {
$thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
} else {
$info['error'][] = 'Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') at offset '.$offset;
return false;
}
if (!$FastMPEGheaderScan) {
$thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']];
$thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']];
$thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']];
$thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);
$thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];
$thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection'];
$thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private'];
$thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];
$thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright'];
$thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original'];
$thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']];
$info['audio']['channels'] = $thisfile_mpeg_audio['channels'];
$info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];
if ($thisfile_mpeg_audio['protection']) {
$thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2));
}
}
if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) {
$info['warning'][] = 'Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1';
$thisfile_mpeg_audio['raw']['bitrate'] = 0;
}
$thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding'];
$thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']];
if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) {
$recursivesearch = false;
}
if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) {
$info['audio']['dataformat'] = 'mp2';
switch ($thisfile_mpeg_audio['channelmode']) {
case 'mono':
if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) {
} else {
$info['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)) {
} else {
$info['error'][] = intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.';
return false;
}
break;
}
}
if ($info['audio']['sample_rate'] > 0) {
$thisfile_mpeg_audio['framelength'] = self::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']);
}
$nextframetestoffset = $offset + 1;
if ($thisfile_mpeg_audio['bitrate'] != 'free') {
$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
if (isset($thisfile_mpeg_audio['framelength'])) {
$nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength'];
} else {
$info['error'][] = 'Frame at offset('.$offset.') is has an invalid frame length.';
return false;
}
}
$ExpectedNumberOfAudioBytes = 0;
if (substr($headerstring, 4 + 32, 4) == 'VBRI') {
$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
$thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer';
$info['audio']['codec'] = 'Fraunhofer';
$SideInfoData = substr($headerstring, 4 + 2, 32);
$FraunhoferVBROffset = 36;
$thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 4, 2));
$thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 6, 2));
$thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 8, 2));
$thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4));
$thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4));
$thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2));
$thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2));
$thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2));
$thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2));
$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 {
$VBRidOffset = self::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);
$SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4);
if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) {
$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
$thisfile_mpeg_audio['VBR_method'] = 'Xing';
$thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($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, $VBRidOffset + 8, 4));
}
if ($thisfile_mpeg_audio['xing_flags']['bytes']) {
$thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4));
}
if (!empty($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') {
$info['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12;
} else {
$info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144;
}
$thisfile_mpeg_audio['framelength'] = floor($framelengthfloat);
}
if ($thisfile_mpeg_audio['xing_flags']['toc']) {
$LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100);
for ($i = 0; $i < 100; $i++) {
$thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData{$i});
}
}
if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {
$thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4));
}
if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') {
$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 ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
unset($thisfile_mpeg_audio_lame['long_version']);
$LAMEtagOffsetContant = $VBRidOffset - 0x24;
$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'];
unset($thisfile_mpeg_audio['VBR_scale']);
$thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1));
$thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9);
$LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1));
$thisfile_mpeg_audio_lame['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4;
$thisfile_mpeg_audio_lame_raw['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F;
$thisfile_mpeg_audio_lame['vbr_method'] = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);
$thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3);
$thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100;
if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {
$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608);
} else {
$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4));
}
if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) {
unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
} else {
$thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
}
$thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2));
$thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2));
if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {
$thisfile_mpeg_audio_lame_RGAD_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;
$thisfile_mpeg_audio_lame_RGAD_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;
$thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;
$thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;
$thisfile_mpeg_audio_lame_RGAD_track['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']);
$thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']);
$thisfile_mpeg_audio_lame_RGAD_track['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']);
if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
$info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
}
$info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
$info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db'];
} else {
unset($thisfile_mpeg_audio_lame_RGAD['track']);
}
if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {
$thisfile_mpeg_audio_lame_RGAD_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;
$thisfile_mpeg_audio_lame_RGAD_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;
$thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;
$thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;
$thisfile_mpeg_audio_lame_RGAD_album['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']);
$thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']);
$thisfile_mpeg_audio_lame_RGAD_album['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']);
if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
$info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
}
$info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
$info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db'];
} else {
unset($thisfile_mpeg_audio_lame_RGAD['album']);
}
if (empty($thisfile_mpeg_audio_lame_RGAD)) {
unset($thisfile_mpeg_audio_lame['RGAD']);
}
$EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($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;
$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1));
if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) {
$thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
} elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {
} elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) {
$thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
}
$EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3));
$thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12;
$thisfile_mpeg_audio_lame['end_padding'] = $EncoderDelays & 0x000FFF;
$MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1));
$thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($MiscByte & 0x03);
$thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($MiscByte & 0x1C) >> 2;
$thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5;
$thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($MiscByte & 0xC0) >> 6;
$thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping'];
$thisfile_mpeg_audio_lame['stereo_mode'] = self::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
$thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
$thisfile_mpeg_audio_lame['source_sample_freq'] = self::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);
$thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($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));
$PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2));
$thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800);
$thisfile_mpeg_audio_lame['surround_info'] = self::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
$thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF);
$thisfile_mpeg_audio_lame['preset_used'] = self::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
$info['warning'][] = 'Unknown LAME preset used ('.$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'])) {
$thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';
}
$thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4));
$ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);
$thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2));
$thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2));
if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
$thisfile_mpeg_audio['bitrate'] = self::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
}
}
}
} else {
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
if ($recursivesearch) {
$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
if ($this->RecursiveFrameScanning($offset, $nextframetestoffset, true)) {
$recursivesearch = false;
$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
}
if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
$info['warning'][] = 'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.';
}
}
}
}
if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) {
if ($ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) {
if ($this->isDependencyFor('matroska') || $this->isDependencyFor('riff')) {
}
elseif (($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) {
$this->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)');
}
else {
$this->warning('Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)');
}
} else {
if ((($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) {
$info['avdataend']--;
} else {
$info['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
}
}
}
if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) {
if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
$framebytelength = $this->FreeFormatFrameLength($offset, true);
if ($framebytelength > 0) {
$thisfile_mpeg_audio['framelength'] = $framebytelength;
if ($thisfile_mpeg_audio['layer'] == '1') {
$info['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
} else {
$info['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
}
} else {
$info['error'][] = 'Error calculating frame length of free-format MP3 without Xing/LAME header';
}
}
}
if (isset($thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') {
switch ($thisfile_mpeg_audio['bitrate_mode']) {
case 'vbr':
case 'abr':
$bytes_per_frame = 1152;
if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
$bytes_per_frame = 384;
} elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
$bytes_per_frame = 576;
}
$thisfile_mpeg_audio['VBR_bitrate'] = (isset($thisfile_mpeg_audio['VBR_bytes']) ? (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / $bytes_per_frame) : 0);
if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {
$info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate'];
$thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate'];
}
break;
}
}
if ($recursivesearch) {
if (!$this->RecursiveFrameScanning($offset, $nextframetestoffset, $ScanAsCBR)) {
return false;
}
}
return true;
}
public function RecursiveFrameScanning(&$offset, &$nextframetestoffset, $ScanAsCBR) {
$info = &$this->getid3->info;
$firstframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
$this->decodeMPEGaudioHeader($offset, $firstframetestarray, false);
for ($i = 0; $i < GETID3_MP3_VALID_CHECK_FRAMES; $i++) {
if (($nextframetestoffset + 4) >= $info['avdataend']) {
return true;
}
$nextframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
if ($this->decodeMPEGaudioHeader($nextframetestoffset, $nextframetestarray, false)) {
if ($ScanAsCBR) {
if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($firstframetestarray['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $firstframetestarray['mpeg']['audio']['bitrate'])) {
return false;
}
}
if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) {
$nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength'];
} else {
$info['error'][] = 'Frame at offset ('.$offset.') is has an invalid frame length.';
return false;
}
} elseif (!empty($firstframetestarray['mpeg']['audio']['framelength']) && (($nextframetestoffset + $firstframetestarray['mpeg']['audio']['framelength']) > $info['avdataend'])) {
return true;
} else {
$info['warning'][] = 'Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.';
return false;
}
}
return true;
}
public function FreeFormatFrameLength($offset, $deepscan=false) {
$info = &$this->getid3->info;
$this->fseek($offset);
$MPEGaudioData = $this->fread(32768);
$SyncPattern1 = substr($MPEGaudioData, 0, 4);
$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) {
$framelength1 = strpos($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) {
$info['error'][] = 'Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset;
return false;
} else {
$info['warning'][] = 'ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)';
$info['audio']['codec'] = 'LAME';
$info['audio']['encoder'] = 'LAME3.88';
$SyncPattern1 = substr($SyncPattern1, 0, 3);
$SyncPattern2 = substr($SyncPattern2, 0, 3);
}
}
if ($deepscan) {
$ActualFrameLengthValues = array();
$nextoffset = $offset + $framelength;
while ($nextoffset < ($info['avdataend'] - 6)) {
$this->fseek($nextoffset - 1);
$NextSyncPattern = $this->fread(6);
if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) {
$ActualFrameLengthValues[] = $framelength;
} elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) {
$ActualFrameLengthValues[] = ($framelength - 1);
$nextoffset--;
} elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) {
$ActualFrameLengthValues[] = ($framelength + 1);
$nextoffset++;
} else {
$info['error'][] = 'Did not find expected free-format sync pattern at offset '.$nextoffset;
return false;
}
$nextoffset += $framelength;
}
if (count($ActualFrameLengthValues) > 0) {
$framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues)));
}
}
return $framelength;
}
public function getOnlyMPEGaudioInfoBruteForce() {
$MPEGaudioHeaderDecodeCache = array();
$MPEGaudioHeaderValidCache = array();
$MPEGaudioHeaderLengthCache = array();
$MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
$MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
$MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
$MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
$MPEGaudioEmphasisLookup = self::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();
$info = &$this->getid3->info;
$this->fseek($info['avdataoffset']);
$max_frames_scan = 5000;
$frames_scanned = 0;
$previousvalidframe = $info['avdataoffset'];
while ($this->ftell() < $info['avdataend']) {
set_time_limit(30);
$head4 = $this->fread(4);
if (strlen($head4) < 4) {
break;
}
if ($head4{0} != "\xFF") {
for ($i = 1; $i < 4; $i++) {
if ($head4{$i} == "\xFF") {
$this->fseek($i - 4, SEEK_CUR);
continue 2;
}
}
continue;
}
if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {
$MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4);
}
if (!isset($MPEGaudioHeaderValidCache[$head4])) {
$MPEGaudioHeaderValidCache[$head4] = self::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] = self::MPEGaudioFrameLength(
$LongMPEGbitrateLookup[$head4],
$LongMPEGversionLookup[$head4],
$LongMPEGlayerLookup[$head4],
$LongMPEGpaddingLookup[$head4],
$LongMPEGfrequencyLookup[$head4]);
}
if ($MPEGaudioHeaderLengthCache[$head4] > 4) {
$WhereWeWere = $this->ftell();
$this->fseek($MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR);
$next4 = $this->fread(4);
if ($next4{0} == "\xFF") {
if (!isset($MPEGaudioHeaderDecodeCache[$next4])) {
$MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4);
}
if (!isset($MPEGaudioHeaderValidCache[$next4])) {
$MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false);
}
if ($MPEGaudioHeaderValidCache[$next4]) {
$this->fseek(-4, SEEK_CUR);
getid3_lib::safe_inc($Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]);
getid3_lib::safe_inc($Distribution['layer'][$LongMPEGlayerLookup[$head4]]);
getid3_lib::safe_inc($Distribution['version'][$LongMPEGversionLookup[$head4]]);
getid3_lib::safe_inc($Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]);
getid3_lib::safe_inc($Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]);
if ($max_frames_scan && (++$frames_scanned >= $max_frames_scan)) {
$pct_data_scanned = ($this->ftell() - $info['avdataoffset']) / ($info['avdataend'] - $info['avdataoffset']);
$info['warning'][] = 'too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.';
foreach ($Distribution as $key1 => $value1) {
foreach ($value1 as $key2 => $value2) {
$Distribution[$key1][$key2] = round($value2 / $pct_data_scanned);
}
}
break;
}
continue;
}
}
unset($next4);
$this->fseek($WhereWeWere - 3);
}
}
}
foreach ($Distribution as $key => $value) {
ksort($Distribution[$key], SORT_NUMERIC);
}
ksort($Distribution['version'], SORT_STRING);
$info['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate'];
$info['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency'];
$info['mpeg']['audio']['layer_distribution'] = $Distribution['layer'];
$info['mpeg']['audio']['version_distribution'] = $Distribution['version'];
$info['mpeg']['audio']['padding_distribution'] = $Distribution['padding'];
if (count($Distribution['version']) > 1) {
$info['error'][] = 'Corrupt file - more than one MPEG version detected';
}
if (count($Distribution['layer']) > 1) {
$info['error'][] = 'Corrupt file - more than one MPEG layer detected';
}
if (count($Distribution['frequency']) > 1) {
$info['error'][] = 'Corrupt file - more than one MPEG sample rate detected';
}
$bittotal = 0;
foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) {
if ($bitratevalue != 'free') {
$bittotal += ($bitratevalue * $bitratecount);
}
}
$info['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']);
if ($info['mpeg']['audio']['frame_count'] == 0) {
$info['error'][] = 'no MPEG audio frames found';
return false;
}
$info['mpeg']['audio']['bitrate'] = ($bittotal / $info['mpeg']['audio']['frame_count']);
$info['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr');
$info['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true);
$info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
$info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
$info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
$info['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true);
$info['fileformat'] = $info['audio']['dataformat'];
return true;
}
public function getOnlyMPEGaudioInfo($avdataoffset, $BitrateHistogram=false) {
$info = &$this->getid3->info;
static $MPEGaudioVersionLookup;
static $MPEGaudioLayerLookup;
static $MPEGaudioBitrateLookup;
if (empty($MPEGaudioVersionLookup)) {
$MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
$MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
}
$this->fseek($avdataoffset);
$sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdataoffset);
if ($sync_seek_buffer_size <= 0) {
$info['error'][] = 'Invalid $sync_seek_buffer_size at offset '.$avdataoffset;
return false;
}
$header = $this->fread($sync_seek_buffer_size);
$sync_seek_buffer_size = strlen($header);
$SynchSeekOffset = 0;
while ($SynchSeekOffset < $sync_seek_buffer_size) {
if ((($avdataoffset + $SynchSeekOffset) < $info['avdataend']) && !feof($this->getid3->fp)) {
if ($SynchSeekOffset > $sync_seek_buffer_size) {
$info['error'][] = 'Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB';
if (isset($info['audio']['bitrate'])) {
unset($info['audio']['bitrate']);
}
if (isset($info['mpeg']['audio'])) {
unset($info['mpeg']['audio']);
}
if (empty($info['mpeg'])) {
unset($info['mpeg']);
}
return false;
} elseif (feof($this->getid3->fp)) {
$info['error'][] = 'Could not find valid MPEG audio synch before end of file';
if (isset($info['audio']['bitrate'])) {
unset($info['audio']['bitrate']);
}
if (isset($info['mpeg']['audio'])) {
unset($info['mpeg']['audio']);
}
if (isset($info['mpeg']) && (!is_array($info['mpeg']) || (count($info['mpeg']) == 0))) {
unset($info['mpeg']);
}
return false;
}
}
if (($SynchSeekOffset + 1) >= strlen($header)) {
$info['error'][] = 'Could not find valid MPEG synch before end of file';
return false;
}
if (($header{$SynchSeekOffset} == "\xFF") && ($header{($SynchSeekOffset + 1)} > "\xE0")) {
if (!isset($FirstFrameThisfileInfo) && !isset($info['mpeg']['audio'])) {
$FirstFrameThisfileInfo = $info;
$FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
if (!$this->decodeMPEGaudioHeader($FirstFrameAVDataOffset, $FirstFrameThisfileInfo, false)) {
unset($FirstFrameThisfileInfo);
}
}
$dummy = $info;
if ($this->decodeMPEGaudioHeader($avdataoffset + $SynchSeekOffset, $dummy, true)) {
$info = $dummy;
$info['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
switch (isset($info['fileformat']) ? $info['fileformat'] : '') {
case '':
case 'id3':
case 'ape':
case 'mp3':
$info['fileformat'] = 'mp3';
$info['audio']['dataformat'] = 'mp3';
break;
}
if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
if (!(abs($info['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) {
$info = $FirstFrameThisfileInfo;
$info['avdataoffset'] = $FirstFrameAVDataOffset;
$info['fileformat'] = 'mp3';
$info['audio']['dataformat'] = 'mp3';
$dummy = $info;
unset($dummy['mpeg']['audio']);
$GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
$GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset;
if ($this->decodeMPEGaudioHeader($GarbageOffsetEnd, $dummy, true, true)) {
$info = $dummy;
$info['avdataoffset'] = $GarbageOffsetEnd;
$info['warning'][] = 'apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd;
} else {
$info['warning'][] = 'using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')';
}
}
}
if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) {
$BitrateHistogram = true;
}
if ($BitrateHistogram) {
$info['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);
$info['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0);
if ($info['mpeg']['audio']['version'] == '1') {
if ($info['mpeg']['audio']['layer'] == 3) {
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);
} elseif ($info['mpeg']['audio']['layer'] == 2) {
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);
} elseif ($info['mpeg']['audio']['layer'] == 1) {
$info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);
}
} elseif ($info['mpeg']['audio']['layer'] == 1) {
$info['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 {
$info['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);
}
$dummy = array('error'=>$info['error'], 'warning'=>$info['warning'], 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
$synchstartoffset = $info['avdataoffset'];
$this->fseek($info['avdataoffset']);
$max_frames_scan = 50000;
$max_scan_segments = 10;
$FastMode = false;
$SynchErrorsFound = 0;
$frames_scanned = 0;
$this_scan_segment = 0;
$frames_scan_per_segment = ceil($max_frames_scan / $max_scan_segments);
$pct_data_scanned = 0;
for ($current_segment = 0; $current_segment < $max_scan_segments; $current_segment++) {
$frames_scanned_this_segment = 0;
if ($this->ftell() >= $info['avdataend']) {
break;
}
$scan_start_offset[$current_segment] = max($this->ftell(), $info['avdataoffset'] + round($current_segment * (($info['avdataend'] - $info['avdataoffset']) / $max_scan_segments)));
if ($current_segment > 0) {
$this->fseek($scan_start_offset[$current_segment]);
$buffer_4k = $this->fread(4096);
for ($j = 0; $j < (strlen($buffer_4k) - 4); $j++) {
if (($buffer_4k{$j} == "\xFF") && ($buffer_4k{($j + 1)} > "\xE0")) {
if ($this->decodeMPEGaudioHeader($scan_start_offset[$current_segment] + $j, $dummy, false, false, $FastMode)) {
$calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength'];
if ($this->decodeMPEGaudioHeader($calculated_next_offset, $dummy, false, false, $FastMode)) {
$scan_start_offset[$current_segment] += $j;
break;
}
}
}
}
}
$synchstartoffset = $scan_start_offset[$current_segment];
while ($this->decodeMPEGaudioHeader($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++;
$synchstartoffset++;
} else {
getid3_lib::safe_inc($info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]);
getid3_lib::safe_inc($info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]);
getid3_lib::safe_inc($info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]);
$synchstartoffset += $dummy['mpeg']['audio']['framelength'];
}
$frames_scanned++;
if ($frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) {
$this_pct_scanned = ($this->ftell() - $scan_start_offset[$current_segment]) / ($info['avdataend'] - $info['avdataoffset']);
if (($current_segment == 0) && (($this_pct_scanned * $max_scan_segments) >= 1)) {
$max_scan_segments = 1;
$frames_scan_per_segment = $max_frames_scan;
} else {
$pct_data_scanned += $this_pct_scanned;
break;
}
}
}
}
if ($pct_data_scanned > 0) {
$info['warning'][] = 'too many MPEG audio frames to scan, only scanned '.$frames_scanned.' frames in '.$max_scan_segments.' segments ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.';
foreach ($info['mpeg']['audio'] as $key1 => $value1) {
if (!preg_match('#_distribution$#i', $key1)) {
continue;
}
foreach ($value1 as $key2 => $value2) {
$info['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned);
}
}
}
if ($SynchErrorsFound > 0) {
$info['warning'][] = 'Found '.$SynchErrorsFound.' synch errors in histogram analysis';
}
$bittotal = 0;
$framecounter = 0;
foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
$framecounter += $bitratecount;
if ($bitratevalue != 'free') {
$bittotal += ($bitratevalue * $bitratecount);
}
}
if ($framecounter == 0) {
$info['error'][] = 'Corrupt MP3 file: framecounter == zero';
return false;
}
$info['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter);
$info['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter);
$info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
$distinct_bitrates = 0;
foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
if ($bitrate_count > 0) {
$distinct_bitrates++;
}
}
if ($distinct_bitrates > 1) {
$info['mpeg']['audio']['bitrate_mode'] = 'vbr';
} else {
$info['mpeg']['audio']['bitrate_mode'] = 'cbr';
}
$info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
}
break;
}
}
$SynchSeekOffset++;
if (($avdataoffset + $SynchSeekOffset) >= $info['avdataend']) {
if (empty($info['mpeg']['audio'])) {
$info['error'][] = 'could not find valid MPEG synch before end of file';
if (isset($info['audio']['bitrate'])) {
unset($info['audio']['bitrate']);
}
if (isset($info['mpeg']['audio'])) {
unset($info['mpeg']['audio']);
}
if (isset($info['mpeg']) && (!is_array($info['mpeg']) || empty($info['mpeg']))) {
unset($info['mpeg']);
}
return false;
}
break;
}
}
$info['audio']['channels'] = $info['mpeg']['audio']['channels'];
$info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode'];
$info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
return true;
}
public static function MPEGaudioVersionArray() {
static $MPEGaudioVersion = array('2.5', false, '2', '1');
return $MPEGaudioVersion;
}
public static function MPEGaudioLayerArray() {
static $MPEGaudioLayer = array(false, 3, 2, 1);
return $MPEGaudioLayer;
}
public static function MPEGaudioBitrateArray() {
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;
}
public static function MPEGaudioFrequencyArray() {
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;
}
public static function MPEGaudioChannelModeArray() {
static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono');
return $MPEGaudioChannelMode;
}
public static function MPEGaudioModeExtensionArray() {
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;
}
public static function MPEGaudioEmphasisArray() {
static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17');
return $MPEGaudioEmphasis;
}
public static function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) {
return self::MPEGaudioHeaderValid(self::MPEGaudioHeaderDecode($head4), false, $allowBitrate15);
}
public static function MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false) {
if (($rawarray['synch'] & 0x0FFE) != 0x0FFE) {
return false;
}
static $MPEGaudioVersionLookup;
static $MPEGaudioLayerLookup;
static $MPEGaudioBitrateLookup;
static $MPEGaudioFrequencyLookup;
static $MPEGaudioChannelModeLookup;
static $MPEGaudioModeExtensionLookup;
static $MPEGaudioEmphasisLookup;
if (empty($MPEGaudioVersionLookup)) {
$MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
$MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
$MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
$MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
$MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
$MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
}
if (isset($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 ($rawarray['bitrate'] == 15) {
if (!$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;
}
return true;
}
public static function MPEGaudioHeaderDecode($Header4Bytes) {
if (strlen($Header4Bytes) != 4) {
return false;
}
$MPEGrawHeader['synch'] = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4;
$MPEGrawHeader['version'] = (ord($Header4Bytes{1}) & 0x18) >> 3;
$MPEGrawHeader['layer'] = (ord($Header4Bytes{1}) & 0x06) >> 1;
$MPEGrawHeader['protection'] = (ord($Header4Bytes{1}) & 0x01);
$MPEGrawHeader['bitrate'] = (ord($Header4Bytes{2}) & 0xF0) >> 4;
$MPEGrawHeader['sample_rate'] = (ord($Header4Bytes{2}) & 0x0C) >> 2;
$MPEGrawHeader['padding'] = (ord($Header4Bytes{2}) & 0x02) >> 1;
$MPEGrawHeader['private'] = (ord($Header4Bytes{2}) & 0x01);
$MPEGrawHeader['channelmode'] = (ord($Header4Bytes{3}) & 0xC0) >> 6;
$MPEGrawHeader['modeextension'] = (ord($Header4Bytes{3}) & 0x30) >> 4;
$MPEGrawHeader['copyright'] = (ord($Header4Bytes{3}) & 0x08) >> 3;
$MPEGrawHeader['original'] = (ord($Header4Bytes{3}) & 0x04) >> 2;
$MPEGrawHeader['emphasis'] = (ord($Header4Bytes{3}) & 0x03);
return $MPEGrawHeader;
}
public static function MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate) {
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') {
$FrameLengthCoefficient = 48;
$SlotLength = 4;
} else {
$FrameLengthCoefficient = 144;
$SlotLength = 1;
}
} else {
if ($layer == '1') {
$FrameLengthCoefficient = 24;
$SlotLength = 4;
} elseif ($layer == '2') {
$FrameLengthCoefficient = 144;
$SlotLength = 1;
} else {
$FrameLengthCoefficient = 72;
$SlotLength = 1;
}
}
if ($samplerate > 0) {
$NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate;
$NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength;
if ($padding) {
$NewFramelength += $SlotLength;
}
$AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
}
}
}
return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
}
public static function ClosestStandardMP3Bitrate($bit_rate) {
static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
static $bit_rate_table = array (0=>'-');
$round_bit_rate = intval(round($bit_rate, -3));
if (!isset($bit_rate_table[$round_bit_rate])) {
if ($round_bit_rate > max($standard_bit_rates)) {
$bit_rate_table[$round_bit_rate] = round($bit_rate, 2 - strlen($bit_rate));
} else {
$bit_rate_table[$round_bit_rate] = max($standard_bit_rates);
foreach ($standard_bit_rates as $standard_bit_rate) {
if ($round_bit_rate >= $standard_bit_rate + (($bit_rate_table[$round_bit_rate] - $standard_bit_rate) / 2)) {
break;
}
$bit_rate_table[$round_bit_rate] = $standard_bit_rate;
}
}
}
return $bit_rate_table[$round_bit_rate];
}
public static function XingVBRidOffset($version, $channelmode) {
static $XingVBRidOffsetCache = array();
if (empty($XingVBRidOffset)) {
$XingVBRidOffset = array (
'1' => array ('mono' => 0x15,
'stereo' => 0x24,
'joint stereo' => 0x24,
'dual channel' => 0x24
),
'2' => array ('mono' => 0x0D,
'stereo' => 0x15,
'joint stereo' => 0x15,
'dual channel' => 0x15
),
'2.5' => array ('mono' => 0x15,
'stereo' => 0x15,
'joint stereo' => 0x15,
'dual channel' => 0x15
)
);
}
return $XingVBRidOffset[$version][$channelmode];
}
public static function LAMEvbrMethodLookup($VBRmethodID) {
static $LAMEvbrMethodLookup = array(
0x00 => 'unknown',
0x01 => 'cbr',
0x02 => 'abr',
0x03 => 'vbr-old / vbr-rh',
0x04 => 'vbr-new / vbr-mtrh',
0x05 => 'vbr-mt',
0x06 => 'vbr (full vbr method 4)',
0x08 => 'cbr (constant bitrate 2 pass)',
0x09 => 'abr (2 pass)',
0x0F => 'reserved'
);
return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : '');
}
public static function LAMEmiscStereoModeLookup($StereoModeID) {
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] : '');
}
public static function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) {
static $LAMEmiscSourceSampleFrequencyLookup = array(
0 => '<= 32 kHz',
1 => '44.1 kHz',
2 => '48 kHz',
3 => '> 48kHz'
);
return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
}
public static function LAMEsurroundInfoLookup($SurroundInfoID) {
static $LAMEsurroundInfoLookup = array(
0 => 'no surround info',
1 => 'DPL encoding',
2 => 'DPL2 encoding',
3 => 'Ambisonic encoding'
);
return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved');
}
public static function LAMEpresetUsedLookup($LAMEtag) {
if ($LAMEtag['preset_used_id'] == 0) {
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:
$LAMEpresetUsedLookup[$i] = '--alt-preset '.$i;
break;
}
}
$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';
$LAMEpresetUsedLookup[1010] = '--preset portable';
$LAMEpresetUsedLookup[1015] = '--preset radio';
$LAMEpresetUsedLookup[320] = '--preset insane';
$LAMEpresetUsedLookup[410] = '-V9';
$LAMEpresetUsedLookup[420] = '-V8';
$LAMEpresetUsedLookup[440] = '-V6';
$LAMEpresetUsedLookup[430] = '--preset radio';
$LAMEpresetUsedLookup[450] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable';
$LAMEpresetUsedLookup[460] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium';
$LAMEpresetUsedLookup[470] = '--r3mix';
$LAMEpresetUsedLookup[480] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard';
$LAMEpresetUsedLookup[490] = '-V1';
$LAMEpresetUsedLookup[500] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme';
return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org');
}
}