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authorTheTroll <trolldev@gmail.com>2010-03-17 22:42:06 +0100
committerTheTroll <trolldev@gmail.com>2010-03-17 22:42:06 +0100
commitd0640763e648d441510afeb5939106eb8d48731c (patch)
treef8542d1329646a3968ee8e6cf4640af103ee8aa6 /getid3/module.audio.mp3.php
parent56cb9c5e115fcf9f6e732d2b2cc95afff66c90ac (diff)
downloadistreamdev-d0640763e648d441510afeb5939106eb8d48731c.tar.gz
istreamdev-d0640763e648d441510afeb5939106eb8d48731c.tar.bz2
Timers WIP
Added getID3
Diffstat (limited to 'getid3/module.audio.mp3.php')
-rw-r--r--getid3/module.audio.mp3.php2022
1 files changed, 2022 insertions, 0 deletions
diff --git a/getid3/module.audio.mp3.php b/getid3/module.audio.mp3.php
new file mode 100644
index 0000000..ac9a273
--- /dev/null
+++ b/getid3/module.audio.mp3.php
@@ -0,0 +1,2022 @@
+<?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']; $channel++) {
+ // for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) {
+ // $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1);
+ // $SideInfoOffset += 2;
+ // }
+ // }
+ // }
+ // for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) {
+ // for ($channel = 0; $channel < $ThisFileInfo['audio']['channels']; $channel++) {
+ // $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12);
+ // $SideInfoOffset += 12;
+ // $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
+ // $SideInfoOffset += 9;
+ // $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8);
+ // $SideInfoOffset += 8;
+ // if ($thisfile_mpeg_audio['version'] == '1') {
+ // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
+ // $SideInfoOffset += 4;
+ // } else {
+ // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
+ // $SideInfoOffset += 9;
+ // }
+ // $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
+ // $SideInfoOffset += 1;
+ //
+ // if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') {
+ //
+ // $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2);
+ // $SideInfoOffset += 2;
+ // $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
+ // $SideInfoOffset += 1;
+ //
+ // for ($region = 0; $region < 2; $region++) {
+ // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
+ // $SideInfoOffset += 5;
+ // }
+ // $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0;
+ //
+ // for ($window = 0; $window < 3; $window++) {
+ // $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3);
+ // $SideInfoOffset += 3;
+ // }
+ //
+ // } else {
+ //
+ // for ($region = 0; $region < 3; $region++) {
+ // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
+ // $SideInfoOffset += 5;
+ // }
+ //
+ // $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
+ // $SideInfoOffset += 4;
+ // $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3);
+ // $SideInfoOffset += 3;
+ // $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0;
+ // }
+ //
+ // if ($thisfile_mpeg_audio['version'] == '1') {
+ // $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
+ // $SideInfoOffset += 1;
+ // }
+ // $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
+ // $SideInfoOffset += 1;
+ // $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
+ // $SideInfoOffset += 1;
+ // }
+ // }
+ //}
+
+ return true;
+ }
+
+ function RecursiveFrameScanning(&$fd, &$ThisFileInfo, &$offset, &$nextframetestoffset, $ScanAsCBR) {
+ for ($i = 0; $i < GETID3_MP3_VALID_CHECK_FRAMES; $i++) {
+ // check next GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch
+ if (($nextframetestoffset + 4) >= $ThisFileInfo['avdataend']) {
+ // end of file
+ return true;
+ }
+
+ $nextframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$ThisFileInfo['avdataend'], 'avdataoffset'=>$ThisFileInfo['avdataoffset']);
+ if (getid3_mp3::decodeMPEGaudioHeader($fd, $nextframetestoffset, $nextframetestarray, false)) {
+ if ($ScanAsCBR) {
+ // force CBR mode, used for trying to pick out invalid audio streams with
+ // valid(?) VBR headers, or VBR streams with no VBR header
+ if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($ThisFileInfo['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $ThisFileInfo['mpeg']['audio']['bitrate'])) {
+ return false;
+ }
+ }
+
+
+ // next frame is OK, get ready to check the one after that
+ if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) {
+ $nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength'];
+ } else {
+ $ThisFileInfo['error'][] = 'Frame at offset ('.$offset.') is has an invalid frame length.';
+ return false;
+ }
+
+ } else {
+
+ // next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence
+ $ThisFileInfo['error'][] = 'Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.';
+
+ return false;
+ }
+ }
+ return true;
+ }
+
+ function FreeFormatFrameLength($fd, $offset, &$ThisFileInfo, $deepscan=false) {
+ fseek($fd, $offset, SEEK_SET);
+ $MPEGaudioData = fread($fd, 32768);
+
+ $SyncPattern1 = substr($MPEGaudioData, 0, 4);
+ // may be different pattern due to padding
+ $SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) | 0x02).$SyncPattern1{3};
+ if ($SyncPattern2 === $SyncPattern1) {
+ $SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) & 0xFD).$SyncPattern1{3};
+ }
+
+ $framelength = false;
+ $framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4);
+ $framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4);
+ if ($framelength1 > 4) {
+ $framelength = $framelength1;
+ }
+ if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
+ $framelength = $framelength2;
+ }
+ if (!$framelength) {
+
+ // LAME 3.88 has a different value for modeextension on the first frame vs the rest
+ $framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4);
+ $framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4);
+
+ if ($framelength1 > 4) {
+ $framelength = $framelength1;
+ }
+ if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
+ $framelength = $framelength2;
+ }
+ if (!$framelength) {
+ $ThisFileInfo['error'][] = 'Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset;
+ return false;
+ } else {
+ $ThisFileInfo['warning'][] = 'ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)';
+ $ThisFileInfo['audio']['codec'] = 'LAME';
+ $ThisFileInfo['audio']['encoder'] = 'LAME3.88';
+ $SyncPattern1 = substr($SyncPattern1, 0, 3);
+ $SyncPattern2 = substr($SyncPattern2, 0, 3);
+ }
+ }
+
+ if ($deepscan) {
+
+ $ActualFrameLengthValues = array();
+ $nextoffset = $offset + $framelength;
+ while ($nextoffset < ($ThisFileInfo['avdataend'] - 6)) {
+ fseek($fd, $nextoffset - 1, SEEK_SET);
+ $NextSyncPattern = fread($fd, 6);
+ if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) {
+ // good - found where expected
+ $ActualFrameLengthValues[] = $framelength;
+ } elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) {
+ // ok - found one byte earlier than expected (last frame wasn't padded, first frame was)
+ $ActualFrameLengthValues[] = ($framelength - 1);
+ $nextoffset--;
+ } elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) {
+ // ok - found one byte later than expected (last frame was padded, first frame wasn't)
+ $ActualFrameLengthValues[] = ($framelength + 1);
+ $nextoffset++;
+ } else {
+ $ThisFileInfo['error'][] = 'Did not find expected free-format sync pattern at offset '.$nextoffset;
+ return false;
+ }
+ $nextoffset += $framelength;
+ }
+ if (count($ActualFrameLengthValues) > 0) {
+ $framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues)));
+ }
+ }
+ return $framelength;
+ }
+
+ function getOnlyMPEGaudioInfoBruteForce($fd, &$ThisFileInfo) {
+
+ $MPEGaudioHeaderDecodeCache = array();
+ $MPEGaudioHeaderValidCache = array();
+ $MPEGaudioHeaderLengthCache = array();
+ $MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
+ $MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
+ $MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
+ $MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray();
+ $MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray();
+ $MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray();
+ $MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray();
+ $LongMPEGversionLookup = array();
+ $LongMPEGlayerLookup = array();
+ $LongMPEGbitrateLookup = array();
+ $LongMPEGpaddingLookup = array();
+ $LongMPEGfrequencyLookup = array();
+
+ $Distribution['bitrate'] = array();
+ $Distribution['frequency'] = array();
+ $Distribution['layer'] = array();
+ $Distribution['version'] = array();
+ $Distribution['padding'] = array();
+
+ fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
+
+ $max_frames_scan = 5000;
+ $frames_scanned = 0;
+
+ $previousvalidframe = $ThisFileInfo['avdataoffset'];
+ while (ftell($fd) < $ThisFileInfo['avdataend']) {
+ set_time_limit(30);
+ $head4 = fread($fd, 4);
+ if (strlen($head4) < 4) {
+ break;
+ }
+ if ($head4{0} != "\xFF") {
+ for ($i = 1; $i < 4; $i++) {
+ if ($head4{$i} == "\xFF") {
+ fseek($fd, $i - 4, SEEK_CUR);
+ continue 2;
+ }
+ }
+ continue;
+ }
+ if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {
+ $MPEGaudioHeaderDecodeCache[$head4] = getid3_mp3::MPEGaudioHeaderDecode($head4);
+ }
+ if (!isset($MPEGaudioHeaderValidCache[$head4])) {
+ $MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false);
+ }
+ if ($MPEGaudioHeaderValidCache[$head4]) {
+
+ if (!isset($MPEGaudioHeaderLengthCache[$head4])) {
+ $LongMPEGversionLookup[$head4] = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']];
+ $LongMPEGlayerLookup[$head4] = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']];
+ $LongMPEGbitrateLookup[$head4] = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']];
+ $LongMPEGpaddingLookup[$head4] = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding'];
+ $LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']];
+ $MPEGaudioHeaderLengthCache[$head4] = getid3_mp3::MPEGaudioFrameLength(
+ $LongMPEGbitrateLookup[$head4],
+ $LongMPEGversionLookup[$head4],
+ $LongMPEGlayerLookup[$head4],
+ $LongMPEGpaddingLookup[$head4],
+ $LongMPEGfrequencyLookup[$head4]);
+ }
+ if ($MPEGaudioHeaderLengthCache[$head4] > 4) {
+ $WhereWeWere = ftell($fd);
+ fseek($fd, $MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR);
+ $next4 = fread($fd, 4);
+ if ($next4{0} == "\xFF") {
+ if (!isset($MPEGaudioHeaderDecodeCache[$next4])) {
+ $MPEGaudioHeaderDecodeCache[$next4] = getid3_mp3::MPEGaudioHeaderDecode($next4);
+ }
+ if (!isset($MPEGaudioHeaderValidCache[$next4])) {
+ $MPEGaudioHeaderValidCache[$next4] = getid3_mp3::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false);
+ }
+ if ($MPEGaudioHeaderValidCache[$next4]) {
+ fseek($fd, -4, SEEK_CUR);
+
+ @$Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]++;
+ @$Distribution['layer'][$LongMPEGlayerLookup[$head4]]++;
+ @$Distribution['version'][$LongMPEGversionLookup[$head4]]++;
+ @$Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]++;
+ @$Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]++;
+ if ($max_frames_scan && (++$frames_scanned >= $max_frames_scan)) {
+ $pct_data_scanned = (ftell($fd) - $ThisFileInfo['avdataoffset']) / ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']);
+ $ThisFileInfo['warning'][] = 'too many MPEG audio frames to scan, only scanned first '.$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);
+ fseek($fd, $WhereWeWere - 3, SEEK_SET);
+ }
+
+ }
+ }
+ foreach ($Distribution as $key => $value) {
+ ksort($Distribution[$key], SORT_NUMERIC);
+ }
+ ksort($Distribution['version'], SORT_STRING);
+ $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate'];
+ $ThisFileInfo['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency'];
+ $ThisFileInfo['mpeg']['audio']['layer_distribution'] = $Distribution['layer'];
+ $ThisFileInfo['mpeg']['audio']['version_distribution'] = $Distribution['version'];
+ $ThisFileInfo['mpeg']['audio']['padding_distribution'] = $Distribution['padding'];
+ if (count($Distribution['version']) > 1) {
+ $ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG version detected';
+ }
+ if (count($Distribution['layer']) > 1) {
+ $ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG layer detected';
+ }
+ if (count($Distribution['frequency']) > 1) {
+ $ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG sample rate detected';
+ }
+
+
+ $bittotal = 0;
+ foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) {
+ if ($bitratevalue != 'free') {
+ $bittotal += ($bitratevalue * $bitratecount);
+ }
+ }
+ $ThisFileInfo['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']);
+ if ($ThisFileInfo['mpeg']['audio']['frame_count'] == 0) {
+ $ThisFileInfo['error'][] = 'no MPEG audio frames found';
+ return false;
+ }
+ $ThisFileInfo['mpeg']['audio']['bitrate'] = ($bittotal / $ThisFileInfo['mpeg']['audio']['frame_count']);
+ $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr');
+ $ThisFileInfo['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true);
+
+ $ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate'];
+ $ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['mpeg']['audio']['bitrate_mode'];
+ $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate'];
+ $ThisFileInfo['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true);
+ $ThisFileInfo['fileformat'] = $ThisFileInfo['audio']['dataformat'];
+
+ return true;
+ }
+
+
+ function getOnlyMPEGaudioInfo($fd, &$ThisFileInfo, $avdataoffset, $BitrateHistogram=false) {
+
+ // looks for synch, decodes MPEG audio header
+
+ static $MPEGaudioVersionLookup;
+ static $MPEGaudioLayerLookup;
+ static $MPEGaudioBitrateLookup;
+ if (empty($MPEGaudioVersionLookup)) {
+ $MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
+ $MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
+ $MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
+
+ }
+
+ fseek($fd, $avdataoffset, SEEK_SET);
+ $sync_seek_buffer_size = min(128 * 1024, $ThisFileInfo['avdataend'] - $avdataoffset);
+ if ($sync_seek_buffer_size <= 0) {
+ $ThisFileInfo['error'][] = 'Invalid $sync_seek_buffer_size at offset '.$avdataoffset;
+ return false;
+ }
+ $header = fread($fd, $sync_seek_buffer_size);
+ $sync_seek_buffer_size = strlen($header);
+ $SynchSeekOffset = 0;
+ while ($SynchSeekOffset < $sync_seek_buffer_size) {
+
+ if ((($avdataoffset + $SynchSeekOffset) < $ThisFileInfo['avdataend']) && !feof($fd)) {
+
+ if ($SynchSeekOffset > $sync_seek_buffer_size) {
+ // if a synch's not found within the first 128k bytes, then give up
+ $ThisFileInfo['error'][] = 'Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB';
+ if (isset($ThisFileInfo['audio']['bitrate'])) {
+ unset($ThisFileInfo['audio']['bitrate']);
+ }
+ if (isset($ThisFileInfo['mpeg']['audio'])) {
+ unset($ThisFileInfo['mpeg']['audio']);
+ }
+ if (empty($ThisFileInfo['mpeg'])) {
+ unset($ThisFileInfo['mpeg']);
+ }
+ return false;
+
+ } elseif (feof($fd)) {
+
+ $ThisFileInfo['error'][] = 'Could not find valid MPEG audio synch before end of file';
+ if (isset($ThisFileInfo['audio']['bitrate'])) {
+ unset($ThisFileInfo['audio']['bitrate']);
+ }
+ if (isset($ThisFileInfo['mpeg']['audio'])) {
+ unset($ThisFileInfo['mpeg']['audio']);
+ }
+ if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || (count($ThisFileInfo['mpeg']) == 0))) {
+ unset($ThisFileInfo['mpeg']);
+ }
+ return false;
+ }
+ }
+
+ if (($SynchSeekOffset + 1) >= strlen($header)) {
+ $ThisFileInfo['error'][] = 'Could not find valid MPEG synch before end of file';
+ return false;
+ }
+
+ if (($header{$SynchSeekOffset} == "\xFF") && ($header{($SynchSeekOffset + 1)} > "\xE0")) { // synch detected
+
+ if (!isset($FirstFrameThisfileInfo) && !isset($ThisFileInfo['mpeg']['audio'])) {
+ $FirstFrameThisfileInfo = $ThisFileInfo;
+ $FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
+ if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $FirstFrameThisfileInfo, false)) {
+ // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
+ // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
+ unset($FirstFrameThisfileInfo);
+ }
+ }
+
+ $dummy = $ThisFileInfo; // only overwrite real data if valid header found
+ if (getid3_mp3::decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $dummy, true)) {
+ $ThisFileInfo = $dummy;
+ $ThisFileInfo['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
+ switch (@$ThisFileInfo['fileformat']) {
+ case '':
+ case 'id3':
+ case 'ape':
+ case 'mp3':
+ $ThisFileInfo['fileformat'] = 'mp3';
+ $ThisFileInfo['audio']['dataformat'] = 'mp3';
+ break;
+ }
+ if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
+ if (!(abs($ThisFileInfo['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) {
+ // If there is garbage data between a valid VBR header frame and a sequence
+ // of valid MPEG-audio frames the VBR data is no longer discarded.
+ $ThisFileInfo = $FirstFrameThisfileInfo;
+ $ThisFileInfo['avdataoffset'] = $FirstFrameAVDataOffset;
+ $ThisFileInfo['fileformat'] = 'mp3';
+ $ThisFileInfo['audio']['dataformat'] = 'mp3';
+ $dummy = $ThisFileInfo;
+ unset($dummy['mpeg']['audio']);
+ $GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
+ $GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset;
+ if (getid3_mp3::decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) {
+
+ $ThisFileInfo = $dummy;
+ $ThisFileInfo['avdataoffset'] = $GarbageOffsetEnd;
+ $ThisFileInfo['warning'][] = 'apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd;
+
+ } else {
+
+ $ThisFileInfo['warning'][] = 'using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')';
+
+ }
+ }
+ }
+ if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode']) && ($ThisFileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($ThisFileInfo['mpeg']['audio']['VBR_method'])) {
+ // VBR file with no VBR header
+ $BitrateHistogram = true;
+ }
+
+ if ($BitrateHistogram) {
+
+ $ThisFileInfo['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);
+ $ThisFileInfo['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0);
+
+ if ($ThisFileInfo['mpeg']['audio']['version'] == '1') {
+ if ($ThisFileInfo['mpeg']['audio']['layer'] == 3) {
+ $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);
+ } elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 2) {
+ $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);
+ } elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) {
+ $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);
+ }
+ } elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) {
+ $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0, 176000=>0, 192000=>0, 224000=>0, 256000=>0);
+ } else {
+ $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 8000=>0, 16000=>0, 24000=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0);
+ }
+
+ $dummy = array('error'=>$ThisFileInfo['error'], 'warning'=>$ThisFileInfo['warning'], 'avdataend'=>$ThisFileInfo['avdataend'], 'avdataoffset'=>$ThisFileInfo['avdataoffset']);
+ $synchstartoffset = $ThisFileInfo['avdataoffset'];
+ fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
+
+ // you can play with these numbers:
+ $max_frames_scan = 50000;
+ $max_scan_segments = 10;
+
+ // don't play with these numbers:
+ $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; $current_segment++) {
+//echo 'was at '.ftell($fd).'<br>';
+ $frames_scanned_this_segment = 0;
+ if (ftell($fd) >= $ThisFileInfo['avdataend']) {
+//echo 'breaking because current position ('.ftell($fd).') is >= $ThisFileInfo[avdataend] ('.$ThisFileInfo['avdataend'].')<br>';
+ break;
+ }
+ $scan_start_offset[$current_segment] = max(ftell($fd), $ThisFileInfo['avdataoffset'] + round($current_segment * (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) / $max_scan_segments)));
+//echo 'start at '.$scan_start_offset[$current_segment].'<br>';
+ if ($current_segment > 0) {
+ fseek($fd, $scan_start_offset[$current_segment], SEEK_SET);
+ $buffer_4k = fread($fd, 4096);
+ for ($j = 0; $j < (strlen($buffer_4k) - 4); $j++) {
+ if (($buffer_4k{$j} == "\xFF") && ($buffer_4k{($j + 1)} > "\xE0")) { // synch detected
+ if (getid3_mp3::decodeMPEGaudioHeader($fd, $scan_start_offset[$current_segment] + $j, $dummy, false, false, $FastMode)) {
+ $calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength'];
+ if (getid3_mp3::decodeMPEGaudioHeader($fd, $calculated_next_offset, $dummy, false, false, $FastMode)) {
+ $scan_start_offset[$current_segment] += $j;
+ break;
+ } else {
+//echo 'header['.__LINE__.'] at '.($calculated_next_offset).' invalid<br>';
+ }
+ } else {
+//echo 'header['.__LINE__.'] at '.($scan_start_offset[$current_segment] + $j).' invalid<br>';
+ }
+ }
+ }
+ }
+//echo 'actually start at '.$scan_start_offset[$current_segment].'<br>';
+ $synchstartoffset = $scan_start_offset[$current_segment];
+ while (getid3_mp3::decodeMPEGaudioHeader($fd, $synchstartoffset, $dummy, false, false, $FastMode)) {
+ $FastMode = true;
+ $thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
+
+ if (empty($dummy['mpeg']['audio']['framelength'])) {
+ $SynchErrorsFound++;
+ $synchstartoffset++;
+//echo ' [Ø] ';
+ } else {
+//echo ' . ';
+ @$ThisFileInfo['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++;
+ @$ThisFileInfo['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++;
+ @$ThisFileInfo['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++;
+
+ $synchstartoffset += $dummy['mpeg']['audio']['framelength'];
+ }
+ $frames_scanned++;
+ if ($frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) {
+ $this_pct_scanned = (ftell($fd) - $scan_start_offset[$current_segment]) / ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']);
+ if (($current_segment == 0) && (($this_pct_scanned * $max_scan_segments) >= 1)) {
+ // file likely contains < $max_frames_scan, just scan as one segment
+ $max_scan_segments = 1;
+ $frames_scan_per_segment = $max_frames_scan;
+ } else {
+ $pct_data_scanned += $this_pct_scanned;
+//var_dump($pct_data_scanned);
+//exit;
+ break;
+ }
+ }
+ }
+//echo '<hr>';
+ }
+ if ($pct_data_scanned > 0) {
+ $ThisFileInfo['warning'][] = 'too many MPEG audio frames to scan, only scanned '.$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 ($ThisFileInfo['mpeg']['audio'] as $key1 => $value1) {
+ if (!eregi('_distribution$', $key1)) {
+ continue;
+ }
+ foreach ($value1 as $key2 => $value2) {
+ $ThisFileInfo['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned);
+ }
+ }
+ }
+
+ if ($SynchErrorsFound > 0) {
+ $ThisFileInfo['warning'][] = 'Found '.$SynchErrorsFound.' synch errors in histogram analysis';
+ //return false;
+ }
+
+ $bittotal = 0;
+ $framecounter = 0;
+ foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
+ $framecounter += $bitratecount;
+ if ($bitratevalue != 'free') {
+ $bittotal += ($bitratevalue * $bitratecount);
+ }
+ }
+ if ($framecounter == 0) {
+ $ThisFileInfo['error'][] = 'Corrupt MP3 file: framecounter == zero';
+ return false;
+ }
+ $ThisFileInfo['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter);
+ $ThisFileInfo['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter);
+
+ $ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate'];
+
+
+ // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
+ $distinct_bitrates = 0;
+ foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
+ if ($bitrate_count > 0) {
+ $distinct_bitrates++;
+ }
+ }
+ if ($distinct_bitrates > 1) {
+ $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'vbr';
+ } else {
+ $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'cbr';
+ }
+ $ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['mpeg']['audio']['bitrate_mode'];
+
+ }
+
+ break; // exit while()
+ }
+ }
+
+ $SynchSeekOffset++;
+ if (($avdataoffset + $SynchSeekOffset) >= $ThisFileInfo['avdataend']) {
+ // end of file/data
+
+ if (empty($ThisFileInfo['mpeg']['audio'])) {
+
+ $ThisFileInfo['error'][] = 'could not find valid MPEG synch before end of file';
+ if (isset($ThisFileInfo['audio']['bitrate'])) {
+ unset($ThisFileInfo['audio']['bitrate']);
+ }
+ if (isset($ThisFileInfo['mpeg']['audio'])) {
+ unset($ThisFileInfo['mpeg']['audio']);
+ }
+ if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || empty($ThisFileInfo['mpeg']))) {
+ unset($ThisFileInfo['mpeg']);
+ }
+ return false;
+
+ }
+ break;
+ }
+
+ }
+ $ThisFileInfo['audio']['channels'] = $ThisFileInfo['mpeg']['audio']['channels'];
+ $ThisFileInfo['audio']['channelmode'] = $ThisFileInfo['mpeg']['audio']['channelmode'];
+ $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate'];
+ return true;
+ }
+
+
+ function MPEGaudioVersionArray() {
+ static $MPEGaudioVersion = array('2.5', false, '2', '1');
+ return $MPEGaudioVersion;
+ }
+
+ function MPEGaudioLayerArray() {
+ static $MPEGaudioLayer = array(false, 3, 2, 1);
+ return $MPEGaudioLayer;
+ }
+
+ 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;
+ }
+
+ 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;
+ }
+
+ function MPEGaudioChannelModeArray() {
+ static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono');
+ return $MPEGaudioChannelMode;
+ }
+
+ 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;
+ }
+
+ function MPEGaudioEmphasisArray() {
+ static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17');
+ return $MPEGaudioEmphasis;
+ }
+
+ function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) {
+ return getid3_mp3::MPEGaudioHeaderValid(getid3_mp3::MPEGaudioHeaderDecode($head4), false, $allowBitrate15);
+ }
+
+ function MPEGaudioHeaderValid($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 = getid3_mp3::MPEGaudioVersionArray();
+ $MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
+ $MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
+ $MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray();
+ $MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray();
+ $MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray();
+ $MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray();
+ }
+
+ if (isset($MPEGaudioVersionLookup[$rawarray['version']])) {
+ $decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']];
+ } else {
+ echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : '');
+ return false;
+ }
+ if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) {
+ $decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']];
+ } else {
+ echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : '');
+ return false;
+ }
+ if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) {
+ echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : '');
+ if ($rawarray['bitrate'] == 15) {
+ // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0
+ // let it go through here otherwise file will not be identified
+ if (!$allowBitrate15) {
+ return false;
+ }
+ } else {
+ return false;
+ }
+ }
+ if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) {
+ echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : '');
+ return false;
+ }
+ if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) {
+ echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : '');
+ return false;
+ }
+ if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) {
+ echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : '');
+ return false;
+ }
+ if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) {
+ echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : '');
+ return false;
+ }
+ // These are just either set or not set, you can't mess that up :)
+ // $rawarray['protection'];
+ // $rawarray['padding'];
+ // $rawarray['private'];
+ // $rawarray['copyright'];
+ // $rawarray['original'];
+
+ return true;
+ }
+
+ function MPEGaudioHeaderDecode($Header4Bytes) {
+ // AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM
+ // A - Frame sync (all bits set)
+ // B - MPEG Audio version ID
+ // C - Layer description
+ // D - Protection bit
+ // E - Bitrate index
+ // F - Sampling rate frequency index
+ // G - Padding bit
+ // H - Private bit
+ // I - Channel Mode
+ // J - Mode extension (Only if Joint stereo)
+ // K - Copyright
+ // L - Original
+ // M - Emphasis
+
+ if (strlen($Header4Bytes) != 4) {
+ return false;
+ }
+
+ $MPEGrawHeader['synch'] = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4;
+ $MPEGrawHeader['version'] = (ord($Header4Bytes{1}) & 0x18) >> 3; // BB
+ $MPEGrawHeader['layer'] = (ord($Header4Bytes{1}) & 0x06) >> 1; // CC
+ $MPEGrawHeader['protection'] = (ord($Header4Bytes{1}) & 0x01); // D
+ $MPEGrawHeader['bitrate'] = (ord($Header4Bytes{2}) & 0xF0) >> 4; // EEEE
+ $MPEGrawHeader['sample_rate'] = (ord($Header4Bytes{2}) & 0x0C) >> 2; // FF
+ $MPEGrawHeader['padding'] = (ord($Header4Bytes{2}) & 0x02) >> 1; // G
+ $MPEGrawHeader['private'] = (ord($Header4Bytes{2}) & 0x01); // H
+ $MPEGrawHeader['channelmode'] = (ord($Header4Bytes{3}) & 0xC0) >> 6; // II
+ $MPEGrawHeader['modeextension'] = (ord($Header4Bytes{3}) & 0x30) >> 4; // JJ
+ $MPEGrawHeader['copyright'] = (ord($Header4Bytes{3}) & 0x08) >> 3; // K
+ $MPEGrawHeader['original'] = (ord($Header4Bytes{3}) & 0x04) >> 2; // L
+ $MPEGrawHeader['emphasis'] = (ord($Header4Bytes{3}) & 0x03); // MM
+
+ return $MPEGrawHeader;
+ }
+
+ function MPEGaudioFrameLength(&$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') {
+
+ // For Layer I slot is 32 bits long
+ $FrameLengthCoefficient = 48;
+ $SlotLength = 4;
+
+ } else { // Layer 2 / 3
+
+ // for Layer 2 and Layer 3 slot is 8 bits long.
+ $FrameLengthCoefficient = 144;
+ $SlotLength = 1;
+
+ }
+
+ } else { // MPEG-2 / MPEG-2.5
+
+ if ($layer == '1') {
+
+ // For Layer I slot is 32 bits long
+ $FrameLengthCoefficient = 24;
+ $SlotLength = 4;
+
+ } elseif ($layer == '2') {
+
+ // for Layer 2 and Layer 3 slot is 8 bits long.
+ $FrameLengthCoefficient = 144;
+ $SlotLength = 1;
+
+ } else { // layer 3
+
+ // for Layer 2 and Layer 3 slot is 8 bits long.
+ $FrameLengthCoefficient = 72;
+ $SlotLength = 1;
+
+ }
+
+ }
+
+ // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
+ if ($samplerate > 0) {
+ $NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate;
+ $NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)
+ if ($padding) {
+ $NewFramelength += $SlotLength;
+ }
+ $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
+ }
+ }
+ }
+ return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
+ }
+
+ function ClosestStandardMP3Bitrate($bitrate) {
+ static $StandardBitrates = array(320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
+ static $BitrateTable = array(0=>'-');
+ $roundbitrate = intval(round($bitrate, -3));
+ if (!isset($BitrateTable[$roundbitrate])) {
+ if ($roundbitrate > 320000) {
+ $BitrateTable[$roundbitrate] = round($bitrate, -4);
+ } else {
+ $LastBitrate = 320000;
+ foreach ($StandardBitrates as $StandardBitrate) {
+ $BitrateTable[$roundbitrate] = $StandardBitrate;
+ if ($roundbitrate >= $StandardBitrate - (($LastBitrate - $StandardBitrate) / 2)) {
+ break;
+ }
+ $LastBitrate = $StandardBitrate;
+ }
+ }
+ }
+ return $BitrateTable[$roundbitrate];
+ }
+
+ function XingVBRidOffset($version, $channelmode) {
+ static $XingVBRidOffsetCache = array();
+ if (empty($XingVBRidOffset)) {
+ $XingVBRidOffset = array (
+ '1' => array ('mono' => 0x15, // 4 + 17 = 21
+ 'stereo' => 0x24, // 4 + 32 = 36
+ 'joint stereo' => 0x24,
+ 'dual channel' => 0x24
+ ),
+
+ '2' => array ('mono' => 0x0D, // 4 + 9 = 13
+ 'stereo' => 0x15, // 4 + 17 = 21
+ 'joint stereo' => 0x15,
+ 'dual channel' => 0x15
+ ),
+
+ '2.5' => array ('mono' => 0x15,
+ 'stereo' => 0x15,
+ 'joint stereo' => 0x15,
+ 'dual channel' => 0x15
+ )
+ );
+ }
+ return $XingVBRidOffset[$version][$channelmode];
+ }
+
+ function LAMEvbrMethodLookup($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] : '');
+ }
+
+ 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] : '');
+ }
+
+ function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) {
+ static $LAMEmiscSourceSampleFrequencyLookup = array(
+ 0 => '<= 32 kHz',
+ 1 => '44.1 kHz',
+ 2 => '48 kHz',
+ 3 => '> 48kHz'
+ );
+ return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
+ }
+
+ 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');
+ }
+
+ function LAMEpresetUsedLookup($LAMEtag) {
+
+ if ($LAMEtag['preset_used_id'] == 0) {
+ // no preset used (LAME >=3.93)
+ // no preset recorded (LAME <3.93)
+ return '';
+ }
+ $LAMEpresetUsedLookup = array();
+
+ ///// THIS PART CANNOT BE STATIC .
+ for ($i = 8; $i <= 320; $i++) {
+ switch ($LAMEtag['vbr_method']) {
+ case 'cbr':
+ $LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i;
+ break;
+ case 'abr':
+ default: // other VBR modes shouldn't be here(?)
+ $LAMEpresetUsedLookup[$i] = '--alt-preset '.$i;
+ break;
+ }
+ }
+
+ // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()
+
+ // named alt-presets
+ $LAMEpresetUsedLookup[1000] = '--r3mix';
+ $LAMEpresetUsedLookup[1001] = '--alt-preset standard';
+ $LAMEpresetUsedLookup[1002] = '--alt-preset extreme';
+ $LAMEpresetUsedLookup[1003] = '--alt-preset insane';
+ $LAMEpresetUsedLookup[1004] = '--alt-preset fast standard';
+ $LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme';
+ $LAMEpresetUsedLookup[1006] = '--alt-preset medium';
+ $LAMEpresetUsedLookup[1007] = '--alt-preset fast medium';
+
+ // LAME 3.94 additions/changes
+ $LAMEpresetUsedLookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003
+ $LAMEpresetUsedLookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003
+
+ $LAMEpresetUsedLookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003
+ $LAMEpresetUsedLookup[410] = '-V9';
+ $LAMEpresetUsedLookup[420] = '-V8';
+ $LAMEpresetUsedLookup[440] = '-V6';
+ $LAMEpresetUsedLookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003
+ $LAMEpresetUsedLookup[450] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003
+ $LAMEpresetUsedLookup[460] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003
+ $LAMEpresetUsedLookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003
+ $LAMEpresetUsedLookup[480] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003
+ $LAMEpresetUsedLookup[490] = '-V1';
+ $LAMEpresetUsedLookup[500] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003
+
+ return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org');
+ }
+
+}
+
+?> \ No newline at end of file
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-26 08:25:03 +0000