function getMPEGHeaderFilepointer(&$fd, &$ThisFileInfo)
{
$ThisFileInfo['fileformat'] = 'mpeg';
// Start code 32 bits
// horizontal frame size 12 bits
// vertical frame size 12 bits
// pixel aspect ratio 4 bits
// frame rate 4 bits
// bitrate 18 bits
// marker bit 1 bit
// VBV buffer size 10 bits
// constrained parameter flag 1 bit
// intra quant. matrix flag 1 bit
// intra quant. matrix values 512 bits (present if matrix flag == 1)
// non-intra quant. matrix flag 1 bit
// non-intra quant. matrix values 512 bits (present if matrix flag == 1)
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
$MPEGvideoHeader = fread($fd, FREAD_BUFFER_SIZE);
$offset = 0;
// MPEG video information is found as $00 $00 $01 $B3
$matching_pattern = chr(0x0) . chr(0x0) . chr(0x1) . chr(0xb3);
while (substr($MPEGvideoHeader, $offset++, 4) !== $matching_pattern) {
if ($offset >= strlen($MPEGvideoHeader) - 12) {
$MPEGvideoHeader .= fread($fd, FREAD_BUFFER_SIZE);
$MPEGvideoHeader = substr($MPEGvideoHeader, $offset);
$offset = 0;
if (strlen($MPEGvideoHeader) < 12) {
$ThisFileInfo['error'] .= "\n" . 'Could not find start of video block before end of file';
unset($ThisFileInfo['fileformat']);
return false;
} elseif (ftell($fd) >= 100000) {
$ThisFileInfo['error'] .= "\n" . 'Could not find start of video block in the first 100,000 bytes (this might not be an MPEG-video file?)';
unset($ThisFileInfo['fileformat']);
return false;
}
}
}
$ThisFileInfo['video']['dataformat'] = 'mpeg';
$offset += strlen($matching_pattern) - 1;
$FrameSizeAspectRatioFrameRateDWORD = BigEndian2Int(substr($MPEGvideoHeader, $offset, 4));
$offset += 4;
$assortedinformation = BigEndian2Int(substr($MPEGvideoHeader, $offset, 4));
$offset += 4;
$ThisFileInfo['mpeg']['video']['raw']['framesize_horizontal'] = ($FrameSizeAspectRatioFrameRateDWORD & 4293918720.0) >> 20;
// 12 bits for horizontal frame size
$ThisFileInfo['mpeg']['video']['raw']['framesize_vertical'] = ($FrameSizeAspectRatioFrameRateDWORD & 0xfff00) >> 8;
// 12 bits for vertical frame size
$ThisFileInfo['mpeg']['video']['raw']['pixel_aspect_ratio'] = ($FrameSizeAspectRatioFrameRateDWORD & 0xf0) >> 4;
$ThisFileInfo['mpeg']['video']['raw']['frame_rate'] = $FrameSizeAspectRatioFrameRateDWORD & 0xf;
$ThisFileInfo['mpeg']['video']['framesize_horizontal'] = $ThisFileInfo['mpeg']['video']['raw']['framesize_horizontal'];
$ThisFileInfo['mpeg']['video']['framesize_vertical'] = $ThisFileInfo['mpeg']['video']['raw']['framesize_vertical'];
$ThisFileInfo['video']['resolution_x'] = $ThisFileInfo['mpeg']['video']['framesize_horizontal'];
$ThisFileInfo['video']['resolution_y'] = $ThisFileInfo['mpeg']['video']['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['video']['frame_rate'] = $ThisFileInfo['mpeg']['video']['frame_rate'];
$ThisFileInfo['mpeg']['video']['raw']['bitrate'] = ($assortedinformation & 4294950912.0) >> 14;
$ThisFileInfo['mpeg']['video']['raw']['marker_bit'] = ($assortedinformation & 0x2000) >> 13;
$ThisFileInfo['mpeg']['video']['raw']['vbv_buffer_size'] = ($assortedinformation & 0x1ff8) >> 3;
$ThisFileInfo['mpeg']['video']['raw']['constrained_param_flag'] = ($assortedinformation & 0x4) >> 2;
$ThisFileInfo['mpeg']['video']['raw']['intra_quant_flag'] = ($assortedinformation & 0x2) >> 1;
if ($ThisFileInfo['mpeg']['video']['raw']['bitrate'] == 0x3ffff) {
// 18 set bits
$ThisFileInfo['mpeg']['video']['bitrate_type'] = 'variable';
$ThisFileInfo['bitrate_mode'] = 'vbr';
} else {
$ThisFileInfo['mpeg']['video']['bitrate'] = $ThisFileInfo['mpeg']['video']['raw']['bitrate'] * 400;
$ThisFileInfo['mpeg']['video']['bitrate_mode'] = 'cbr';
$ThisFileInfo['video']['bitrate_mode'] = $ThisFileInfo['mpeg']['video']['bitrate_mode'];
$ThisFileInfo['video']['bitrate'] = $ThisFileInfo['mpeg']['video']['bitrate'];
}
$ThisFileInfo['video']['bitrate_mode'] = $ThisFileInfo['mpeg']['video']['bitrate_mode'];
$ThisFileInfo['video']['bitrate'] = $ThisFileInfo['mpeg']['video']['bitrate'];
return true;
}
function getMPEGHeaderFilepointer(&$fd, &$MP3fileInfo)
{
// Start code 32 bits
// horizontal frame size 12 bits
// vertical frame size 12 bits
// pixel aspect ratio 4 bits
// frame rate 4 bits
// bitrate 18 bits
// marker bit 1 bit
// VBV buffer size 10 bits
// constrained parameter flag 1 bit
// intra quant. matrix flag 1 bit
// intra quant. matrix values 512 bits (present if matrix flag == 1)
// non-intra quant. matrix flag 1 bit
// non-intra quant. matrix values 512 bits (present if matrix flag == 1)
if (!$fd) {
$MP3fileInfo['error'] .= "\n" . 'Could not open file';
return FALSE;
} else {
// MPEG video information is found as $00 $00 $01 $B3
$matching_pattern = chr(0x0) . chr(0x0) . chr(0x1) . chr(0xb3);
rewind($fd);
$MPEGvideoHeader = fread($fd, FREAD_BUFFER_SIZE);
$offset = 0;
while (substr($MPEGvideoHeader, $offset++, 4) !== $matching_pattern) {
if ($offset >= strlen($MPEGvideoHeader) - 12) {
$MPEGvideoHeader .= fread($fd, FREAD_BUFFER_SIZE);
$MPEGvideoHeader = substr($MPEGvideoHeader, $offset);
$offset = 0;
if (strlen($MPEGvideoHeader) < 12) {
$MP3fileInfo['error'] = "\n" . 'Could not find start of video block before end of file';
return FALSE;
// return array('error'=>'Could not find start of video block before end of file');
} else {
if (ftell($fd) >= 100000) {
$MP3fileInfo['error'] = "\n" . 'Could not find start of video block in the first 100,000 bytes (this might not be an MPEG-video file?)';
unset($MP3fileInfo['fileformat']);
return FALSE;
// return array('error'=>"\n".'Could not find start of video block in the first 100,000 bytes (this might not be an MPEG-video file?)', 'fileformat'=>'');
}
}
}
}
$offset += strlen($matching_pattern) - 1;
$framesizes = BigEndian2Bin(substr($MPEGvideoHeader, $offset, 3));
$offset += 3;
$aspect_framerate = BigEndian2Bin(substr($MPEGvideoHeader, $offset, 1));
$offset += 1;
$assortedinformation = BigEndian2Bin(substr($MPEGvideoHeader, $offset, 4));
$offset += 4;
$MP3fileInfo['mpeg']['video']['raw']['framesize_horizontal'] = bindec(substr($framesizes, 0, 12));
// 12 bits for horizontal frame size
$MP3fileInfo['mpeg']['video']['raw']['framesize_vertical'] = bindec(substr($framesizes, 12, 12));
// 12 bits for vertical frame size
$MP3fileInfo['mpeg']['video']['framesize_horizontal'] = $MP3fileInfo['mpeg']['video']['raw']['framesize_horizontal'];
$MP3fileInfo['mpeg']['video']['framesize_vertical'] = $MP3fileInfo['mpeg']['video']['raw']['framesize_vertical'];
$MP3fileInfo['mpeg']['video']['raw']['pixel_aspect_ratio'] = bindec(substr($aspect_framerate, 0, 4));
$MP3fileInfo['mpeg']['video']['raw']['frame_rate'] = bindec(substr($aspect_framerate, 4, 4));
$MP3fileInfo['mpeg']['video']['pixel_aspect_ratio'] = MPEGvideoAspectRatioLookup($MP3fileInfo['mpeg']['video']['raw']['pixel_aspect_ratio']);
$MP3fileInfo['mpeg']['video']['pixel_aspect_ratio_text'] = MPEGvideoAspectRatioTextLookup($MP3fileInfo['mpeg']['video']['raw']['pixel_aspect_ratio']);
$MP3fileInfo['mpeg']['video']['frame_rate'] = MPEGvideoFramerateLookup($MP3fileInfo['mpeg']['video']['raw']['frame_rate']);
$MP3fileInfo['mpeg']['video']['raw']['bitrate'] = bindec(substr($assortedinformation, 0, 18));
if ($MP3fileInfo['mpeg']['video']['raw']['bitrate'] == 0x3ffff) {
// 18 set bits
$MP3fileInfo['mpeg']['video']['bitrate_type'] = 'variable';
} else {
$MP3fileInfo['mpeg']['video']['bitrate_type'] = 'constant';
$MP3fileInfo['mpeg']['video']['bitrate_bps'] = $MP3fileInfo['mpeg']['video']['raw']['bitrate'] * 400;
//$MP3fileInfo['mpeg']['video']['bitrate_kbytes'] = $MP3fileInfo['mpeg']['video']['bitrate_bps'] / 8192;
}
$MP3fileInfo['mpeg']['video']['raw']['marker_bit'] = bindec(substr($assortedinformation, 18, 1));
$MP3fileInfo['mpeg']['video']['raw']['vbv_buffer_size'] = bindec(substr($assortedinformation, 19, 10));
$MP3fileInfo['mpeg']['video']['raw']['constrained_param_flag'] = bindec(substr($assortedinformation, 29, 1));
$MP3fileInfo['mpeg']['video']['raw']['intra_quant_flag'] = bindec(substr($assortedinformation, 30, 1));
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;
}