function getOnlyMPEGaudioInfo($fd, &$MP3fileInfo, $audiodataoffset)
{
// looks for synch, decodes MPEG audio header
// you may call this function directly if you don't need any ID3 info
fseek($fd, $audiodataoffset);
$header = '';
$SynchSeekOffset = 0;
while (!isset($MP3fileInfo['fileformat']) || $MP3fileInfo['fileformat'] == '' || $MP3fileInfo['fileformat'] == 'id3') {
if ($SynchSeekOffset > strlen($header) - 8192 && !feof($fd)) {
if ($SynchSeekOffset > FREAD_BUFFER_SIZE * 4) {
// if a synch's not found within the first 64k bytes, then give up
$MP3fileInfo['error'] .= "\n" . 'could not find valid MPEG synch within the first ' . FREAD_BUFFER_SIZE * 4 . ' bytes';
if (isset($MP3fileInfo['bitrate'])) {
unset($MP3fileInfo['bitrate']);
}
if (isset($MP3fileInfo['mpeg']['audio'])) {
unset($MP3fileInfo['mpeg']['audio']);
}
if (isset($MP3fileInfo['mpeg']) && (!is_array($MP3fileInfo['mpeg']) || count($MP3fileInfo['mpeg']) == 0)) {
unset($MP3fileInfo['mpeg']);
}
return FALSE;
} else {
if ($header .= fread($fd, FREAD_BUFFER_SIZE)) {
// great
} else {
$MP3fileInfo['error'] .= "\n" . 'could not find valid MPEG synch before end of file';
if (isset($MP3fileInfo['bitrate'])) {
unset($MP3fileInfo['bitrate']);
}
if (isset($MP3fileInfo['mpeg']['audio'])) {
unset($MP3fileInfo['mpeg']['audio']);
}
if (isset($MP3fileInfo['mpeg']) && (!is_array($MP3fileInfo['mpeg']) || count($MP3fileInfo['mpeg']) == 0)) {
unset($MP3fileInfo['mpeg']);
}
return FALSE;
}
}
}
if (ord($header[$SynchSeekOffset]) == 0xff && substr(BigEndian2Bin(substr($header, $SynchSeekOffset, 2)), 0, 11) == '11111111111') {
// synch detected
if (decodeMPEGaudioHeader($fd, $audiodataoffset + $SynchSeekOffset, $MP3fileInfo, TRUE)) {
$MP3fileInfo['audiodataoffset'] = $audiodataoffset + $SynchSeekOffset;
$MP3fileInfo['fileformat'] = 'mp3';
break;
// exit for() and while()
}
}
if (!isset($MP3fileInfo['fileformat']) || $MP3fileInfo['fileformat'] == '' || $MP3fileInfo['fileformat'] == 'id3') {
$SynchSeekOffset++;
if ($audiodataoffset + $SynchSeekOffset >= $MP3fileInfo['filesize']) {
// end of file
$MP3fileInfo['error'] .= "\n" . 'could not find valid MPEG synch before end of file';
if (isset($MP3fileInfo['bitrate'])) {
unset($MP3fileInfo['bitrate']);
}
if (isset($MP3fileInfo['mpeg']['audio'])) {
unset($MP3fileInfo['mpeg']['audio']);
}
if (isset($MP3fileInfo['mpeg']) && (!is_array($MP3fileInfo['mpeg']) || count($MP3fileInfo['mpeg']) == 0)) {
unset($MP3fileInfo['mpeg']);
}
return FALSE;
}
}
}
return TRUE;
}
function getOnlyMPEGaudioInfo($fd, &$ThisFileInfo, $avdataoffset, $BitrateHistogram = false)
{
// looks for synch, decodes MPEG audio header
fseek($fd, $avdataoffset, SEEK_SET);
$header = '';
$SynchSeekOffset = 0;
if (!defined('CONST_FF')) {
define('CONST_FF', chr(0xff));
define('CONST_E0', chr(0xe0));
}
static $MPEGaudioVersionLookup;
static $MPEGaudioLayerLookup;
static $MPEGaudioBitrateLookup;
if (empty($MPEGaudioVersionLookup)) {
$MPEGaudioVersionLookup = MPEGaudioVersionArray();
$MPEGaudioLayerLookup = MPEGaudioLayerArray();
$MPEGaudioBitrateLookup = MPEGaudioBitrateArray();
}
$header_len = strlen($header) - round(FREAD_BUFFER_SIZE / 2);
while (true) {
if ($SynchSeekOffset > $header_len && $avdataoffset + $SynchSeekOffset < $ThisFileInfo['avdataend'] && !feof($fd)) {
if ($SynchSeekOffset > 131072) {
// if a synch's not found within the first 128k bytes, then give up
$ThisFileInfo['error'] .= "\n" . 'could not find valid MPEG synch within the first 131072 bytes';
if (isset($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($ThisFileInfo['mpeg']);
}
return false;
} elseif ($header .= fread($fd, FREAD_BUFFER_SIZE)) {
// great
$header_len = strlen($header) - round(FREAD_BUFFER_SIZE / 2);
} else {
$ThisFileInfo['error'] .= "\n" . 'could not find valid MPEG synch before end of file';
if (isset($ThisFileInfo['audio']['bitrate'])) {
unset($ThisFileInfo['audio']['bitrate']);
}
if (isset($ThisFileInfo['mpeg']['audio'])) {
unset($ThisFileInfo['mpeg']['audio']);
}
if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || count($ThisFileInfo['mpeg']) == 0)) {
unset($ThisFileInfo['mpeg']);
}
return false;
}
}
if ($SynchSeekOffset + 1 >= strlen($header)) {
$ThisFileInfo['error'] .= "\n" . 'could not find valid MPEG synch before end of file';
return false;
}
if ($header[$SynchSeekOffset] == CONST_FF && $header[$SynchSeekOffset + 1] > CONST_E0) {
// synch detected
if (!isset($FirstFrameThisfileInfo) && !isset($ThisFileInfo['mpeg']['audio'])) {
$FirstFrameThisfileInfo = $ThisFileInfo;
$FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
if (!decodeMPEGaudioHeader($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 = $ThisFileInfo;
// only overwrite real data if valid header found
if (decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $dummy, true)) {
$ThisFileInfo = $dummy;
$ThisFileInfo['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
switch ($ThisFileInfo['fileformat']) {
case '':
case 'id3':
case 'ape':
case 'mp3':
$ThisFileInfo['fileformat'] = 'mp3';
$ThisFileInfo['audio']['dataformat'] = 'mp3';
}
if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && $FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr') {
if (!CloseMatch($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 + $SynchSeekOffset;
if (decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) {
$ThisFileInfo = $dummy;
$ThisFileInfo['avdataoffset'] = $GarbageOffsetEnd;
$ThisFileInfo['warning'] .= "\n" . 'apparently-valid VBR header not used because could not find ' . MPEG_VALID_CHECK_FRAMES . ' consecutive MPEG-audio frames immediately after VBR header (garbage data for ' . ($GarbageOffsetEnd - $GarbageOffsetStart) . ' bytes between ' . $GarbageOffsetStart . ' and ' . $GarbageOffsetEnd . '), but did find valid CBR stream starting at ' . $GarbageOffsetEnd;
} else {
$ThisFileInfo['warning'] .= "\n" . 'using data from VBR header even though could not find ' . MPEG_VALID_CHECK_FRAMES . ' consecutive MPEG-audio frames immediately after VBR header (garbage data for ' . ($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'] == 'III') {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32 => 0, 40 => 0, 48 => 0, 56 => 0, 64 => 0, 80 => 0, 96 => 0, 112 => 0, 128 => 0, 160 => 0, 192 => 0, 224 => 0, 256 => 0, 320 => 0);
} elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 'II') {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32 => 0, 48 => 0, 56 => 0, 64 => 0, 80 => 0, 96 => 0, 112 => 0, 128 => 0, 160 => 0, 192 => 0, 224 => 0, 256 => 0, 320 => 0, 384 => 0);
} elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 'I') {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32 => 0, 64 => 0, 96 => 0, 128 => 0, 160 => 0, 192 => 0, 224 => 0, 256 => 0, 288 => 0, 320 => 0, 352 => 0, 384 => 0, 416 => 0, 448 => 0);
}
} elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 'I') {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32 => 0, 48 => 0, 56 => 0, 64 => 0, 80 => 0, 96 => 0, 112 => 0, 128 => 0, 144 => 0, 160 => 0, 176 => 0, 192 => 0, 224 => 0, 256 => 0);
} else {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 8 => 0, 16 => 0, 24 => 0, 32 => 0, 40 => 0, 48 => 0, 56 => 0, 64 => 0, 80 => 0, 96 => 0, 112 => 0, 128 => 0, 144 => 0, 160 => 0);
}
$dummy = array('error' => $ThisFileInfo['error'], 'warning' => $ThisFileInfo['warning'], 'avdataend' => $ThisFileInfo['avdataend'], 'avdataoffset' => $ThisFileInfo['avdataoffset']);
$synchstartoffset = $ThisFileInfo['avdataoffset'];
$FastMode = false;
while (decodeMPEGaudioHeader($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']];
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++;
$ThisFileInfo['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++;
$ThisFileInfo['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++;
if (empty($dummy['mpeg']['audio']['framelength'])) {
$ThisFileInfo['warning'] .= "\n" . 'Invalid/missing framelength in histogram analysis - aborting';
$synchstartoffset += 4;
// return false;
}
$synchstartoffset += $dummy['mpeg']['audio']['framelength'];
}
$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'] .= "\n" . 'Corrupt MP3 file: framecounter == zero';
return false;
}
$ThisFileInfo['mpeg']['audio']['frame_count'] = $framecounter;
$ThisFileInfo['mpeg']['audio']['bitrate'] = 1000 * ($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'])) {
$ThisFileInfo['error'] .= "\n" . 'could not find valid MPEG synch before end of file';
if (isset($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']['bits_per_sample'] = 16;
$ThisFileInfo['audio']['channels'] = $ThisFileInfo['mpeg']['audio']['channels'];
$ThisFileInfo['audio']['channelmode'] = $ThisFileInfo['mpeg']['audio']['channelmode'];
$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate'];
return true;
}
function getMPEGHeaderFilepointer(&$fd, &$ThisFileInfo)
{
$ThisFileInfo['fileformat'] = 'mpeg';
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
$MPEGstreamData = fread($fd, min(100000, $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']));
$MPEGstreamDataLength = strlen($MPEGstreamData);
$foundVideo = true;
$VideoChunkOffset = 0;
while (substr($MPEGstreamData, $VideoChunkOffset++, 4) !== MPEG_VIDEO_SEQUENCE_HEADER) {
if ($VideoChunkOffset >= $MPEGstreamDataLength) {
$foundVideo = false;
break 2;
}
}
if ($foundVideo) {
// Start code 32 bits
// horizontal frame size 12 bits
// vertical frame size 12 bits
// pixel aspect ratio 4 bits
// frame rate 4 bits
// bitrate 18 bits
// marker bit 1 bit
// VBV buffer size 10 bits
// constrained parameter flag 1 bit
// intra quant. matrix flag 1 bit
// intra quant. matrix values 512 bits (present if matrix flag == 1)
// non-intra quant. matrix flag 1 bit
// non-intra quant. matrix values 512 bits (present if matrix flag == 1)
$ThisFileInfo['video']['dataformat'] = 'mpeg';
// I don't know how to differentiate between MPEG-1 and MPEG-2 video stream
// Any information appreciated: info@getid3.org
//$ThisFileInfo['video']['codec'] = 'MPEG-1';
//$ThisFileInfo['video']['codec'] = 'MPEG-2';
$ThisFileInfo['video']['codec'] = 'MPEG';
$VideoChunkOffset += strlen(MPEG_VIDEO_SEQUENCE_HEADER) - 1;
$FrameSizeDWORD = BigEndian2Int(substr($MPEGstreamData, $VideoChunkOffset, 3));
$VideoChunkOffset += 3;
$AspectRatioFrameRateDWORD = BigEndian2Int(substr($MPEGstreamData, $VideoChunkOffset, 1));
$VideoChunkOffset += 1;
$assortedinformation = BigEndian2Bin(substr($MPEGstreamData, $VideoChunkOffset, 4));
$VideoChunkOffset += 4;
$ThisFileInfo['mpeg']['video']['raw']['framesize_horizontal'] = ($FrameSizeDWORD & 0xfff000) >> 12;
// 12 bits for horizontal frame size
$ThisFileInfo['mpeg']['video']['raw']['framesize_vertical'] = $FrameSizeDWORD & 0xfff;
// 12 bits for vertical frame size
$ThisFileInfo['mpeg']['video']['raw']['pixel_aspect_ratio'] = ($AspectRatioFrameRateDWORD & 0xf0) >> 4;
$ThisFileInfo['mpeg']['video']['raw']['frame_rate'] = $AspectRatioFrameRateDWORD & 0xf;
$ThisFileInfo['mpeg']['video']['framesize_horizontal'] = $ThisFileInfo['mpeg']['video']['raw']['framesize_horizontal'];
$ThisFileInfo['mpeg']['video']['framesize_vertical'] = $ThisFileInfo['mpeg']['video']['raw']['framesize_vertical'];
$ThisFileInfo['mpeg']['video']['pixel_aspect_ratio'] = MPEGvideoAspectRatioLookup($ThisFileInfo['mpeg']['video']['raw']['pixel_aspect_ratio']);
$ThisFileInfo['mpeg']['video']['pixel_aspect_ratio_text'] = MPEGvideoAspectRatioTextLookup($ThisFileInfo['mpeg']['video']['raw']['pixel_aspect_ratio']);
$ThisFileInfo['mpeg']['video']['frame_rate'] = MPEGvideoFramerateLookup($ThisFileInfo['mpeg']['video']['raw']['frame_rate']);
$ThisFileInfo['mpeg']['video']['raw']['bitrate'] = Bin2Dec(substr($assortedinformation, 0, 18));
$ThisFileInfo['mpeg']['video']['raw']['marker_bit'] = Bin2Dec(substr($assortedinformation, 18, 1));
$ThisFileInfo['mpeg']['video']['raw']['vbv_buffer_size'] = Bin2Dec(substr($assortedinformation, 19, 10));
$ThisFileInfo['mpeg']['video']['raw']['constrained_param_flag'] = Bin2Dec(substr($assortedinformation, 29, 1));
$ThisFileInfo['mpeg']['video']['raw']['intra_quant_flag'] = Bin2Dec(substr($assortedinformation, 30, 1));
if ($ThisFileInfo['mpeg']['video']['raw']['bitrate'] == 0x3ffff) {
// 18 set bits
$ThisFileInfo['warning'] .= "\n" . 'This version of getID3() [' . GETID3VERSION . '] cannot determine average bitrate of VBR MPEG video files';
$ThisFileInfo['mpeg']['video']['bitrate_mode'] = 'vbr';
} else {
$ThisFileInfo['mpeg']['video']['bitrate'] = $ThisFileInfo['mpeg']['video']['raw']['bitrate'] * 400;
$ThisFileInfo['mpeg']['video']['bitrate_mode'] = 'cbr';
$ThisFileInfo['video']['bitrate'] = $ThisFileInfo['mpeg']['video']['bitrate'];
}
$ThisFileInfo['video']['resolution_x'] = $ThisFileInfo['mpeg']['video']['framesize_horizontal'];
$ThisFileInfo['video']['resolution_y'] = $ThisFileInfo['mpeg']['video']['framesize_vertical'];
$ThisFileInfo['video']['frame_rate'] = $ThisFileInfo['mpeg']['video']['frame_rate'];
$ThisFileInfo['video']['bitrate_mode'] = $ThisFileInfo['mpeg']['video']['bitrate_mode'];
$ThisFileInfo['video']['lossless'] = false;
$ThisFileInfo['video']['bits_per_sample'] = 24;
} else {
$ThisFileInfo['error'] .= "\n" . 'Could not find start of video block in the first 100,000 bytes (or before end of file) - this might not be an MPEG-video file?';
}
$AudioChunkOffset = 0;
while (true) {
while (substr($MPEGstreamData, $AudioChunkOffset++, 4) !== MPEG_AUDIO_START) {
if ($AudioChunkOffset >= $MPEGstreamDataLength) {
break 2;
}
}
require_once GETID3_INCLUDEPATH . 'getid3.mp3.php';
for ($i = 0; $i <= 2; $i++) {
// some files have the MPEG-audio header 8 bytes after the end of the $00 $00 $01 $C0 signature, some have it 9 bytes, some 10 bytes after
// I have no idea why or what the difference is, so this is a stupid hack.
// If anybody has any better idea of what's going on, please let me know - info@getid3.org
$dummy = $ThisFileInfo;
if (decodeMPEGaudioHeader($fd, $AudioChunkOffset + 3 + 8 + $i, $dummy, false)) {
$ThisFileInfo = $dummy;
$ThisFileInfo['audio']['bits_per_sample'] = 16;
$ThisFileInfo['audio']['bitrate_mode'] = 'cbr';
$ThisFileInfo['audio']['lossless'] = false;
break 2;
}
}
}
return true;
}
