module.audio-video.mpeg.php

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<?php
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <[e-mail]>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details                             //
/////////////////////////////////////////////////////////////////
//                                                             //
// module.audio-video.mpeg.php                                 //
// module for analyzing MPEG files                             //
// dependencies: module.audio.mp3.php                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.mp3.php', __FILE__, true);

define('GETID3_MPEG_VIDEO_PICTURE_START',   "\x00\x00\x01\x00");
define('GETID3_MPEG_VIDEO_USER_DATA_START', "\x00\x00\x01\xB2");
define('GETID3_MPEG_VIDEO_SEQUENCE_HEADER', "\x00\x00\x01\xB3");
define('GETID3_MPEG_VIDEO_SEQUENCE_ERROR',  "\x00\x00\x01\xB4");
define('GETID3_MPEG_VIDEO_EXTENSION_START', "\x00\x00\x01\xB5");
define('GETID3_MPEG_VIDEO_SEQUENCE_END',    "\x00\x00\x01\xB7");
define('GETID3_MPEG_VIDEO_GROUP_START',     "\x00\x00\x01\xB8");
define('GETID3_MPEG_AUDIO_START',           "\x00\x00\x01\xC0");


class getid3_mpeg
{

	function getid3_mpeg(&$fd, &$ThisFileInfo) {
		if ($ThisFileInfo['avdataend'] <= $ThisFileInfo['avdataoffset']) {
			$ThisFileInfo['error'][] = '"avdataend" ('.$ThisFileInfo['avdataend'].') is unexpectedly less-than-or-equal-to "avdataoffset" ('.$ThisFileInfo['avdataoffset'].')';
			return false;
		}
		$ThisFileInfo['fileformat'] = 'mpeg';
		fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
		$MPEGstreamData       = fread($fd, min(100000, $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']));
		$MPEGstreamDataLength = strlen($MPEGstreamData);

		$foundVideo = true;
		$VideoChunkOffset = 0;
		while (substr($MPEGstreamData, $VideoChunkOffset++, 4) !== GETID3_MPEG_VIDEO_SEQUENCE_HEADER) {
			if ($VideoChunkOffset >= $MPEGstreamDataLength) {
				$foundVideo = false;
				break;
			}
		}
		if ($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';

			$VideoChunkOffset += (strlen(GETID3_MPEG_VIDEO_SEQUENCE_HEADER) - 1);

			$FrameSizeDWORD = getid3_lib::BigEndian2Int(substr($MPEGstreamData, $VideoChunkOffset, 3));
			$VideoChunkOffset += 3;

			$AspectRatioFrameRateDWORD = getid3_lib::BigEndian2Int(substr($MPEGstreamData, $VideoChunkOffset, 1));
			$VideoChunkOffset += 1;

			$assortedinformation = getid3_lib::BigEndian2Bin(substr($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 & 0x000FFF);       // 12 bits for vertical frame size
			$ThisFileInfo['mpeg']['video']['raw']['pixel_aspect_ratio']   = ($AspectRatioFrameRateDWORD & 0xF0) >> 4;
			$ThisFileInfo['mpeg']['video']['raw']['frame_rate']           = ($AspectRatioFrameRateDWORD & 0x0F);

			$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']      = $this->MPEGvideoAspectRatioLookup($ThisFileInfo['mpeg']['video']['raw']['pixel_aspect_ratio']);
			$ThisFileInfo['mpeg']['video']['pixel_aspect_ratio_text'] = $this->MPEGvideoAspectRatioTextLookup($ThisFileInfo['mpeg']['video']['raw']['pixel_aspect_ratio']);
			$ThisFileInfo['mpeg']['video']['frame_rate']              = $this->MPEGvideoFramerateLookup($ThisFileInfo['mpeg']['video']['raw']['frame_rate']);

			$ThisFileInfo['mpeg']['video']['raw']['bitrate']                =        getid3_lib::Bin2Dec(substr($assortedinformation,  0, 18));
			$ThisFileInfo['mpeg']['video']['raw']['marker_bit']             = (bool) getid3_lib::Bin2Dec(substr($assortedinformation, 18,  1));
			$ThisFileInfo['mpeg']['video']['raw']['vbv_buffer_size']        =        getid3_lib::Bin2Dec(substr($assortedinformation, 19, 10));
			$ThisFileInfo['mpeg']['video']['raw']['constrained_param_flag'] = (bool) getid3_lib::Bin2Dec(substr($assortedinformation, 29,  1));
			$ThisFileInfo['mpeg']['video']['raw']['intra_quant_flag']       = (bool) getid3_lib::Bin2Dec(substr($assortedinformation, 30,  1));
			if ($ThisFileInfo['mpeg']['video']['raw']['intra_quant_flag']) {

				// read 512 bits
				$ThisFileInfo['mpeg']['video']['raw']['intra_quant']          = getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $VideoChunkOffset, 64));
				$VideoChunkOffset += 64;

				$ThisFileInfo['mpeg']['video']['raw']['non_intra_quant_flag'] = (bool) getid3_lib::Bin2Dec(substr($ThisFileInfo['mpeg']['video']['raw']['intra_quant'], 511,  1));
				$ThisFileInfo['mpeg']['video']['raw']['intra_quant']          =        getid3_lib::Bin2Dec(substr($assortedinformation, 31,  1)).substr(getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $VideoChunkOffset, 64)), 0, 511);

				if ($ThisFileInfo['mpeg']['video']['raw']['non_intra_quant_flag']) {
					$ThisFileInfo['mpeg']['video']['raw']['non_intra_quant'] = substr($MPEGstreamData, $VideoChunkOffset, 64);
					$VideoChunkOffset += 64;
				}

			} else {

				$ThisFileInfo['mpeg']['video']['raw']['non_intra_quant_flag'] = (bool) getid3_lib::Bin2Dec(substr($assortedinformation, 31,  1));
				if ($ThisFileInfo['mpeg']['video']['raw']['non_intra_quant_flag']) {
					$ThisFileInfo['mpeg']['video']['raw']['non_intra_quant'] = substr($MPEGstreamData, $VideoChunkOffset, 64);
					$VideoChunkOffset += 64;
				}

			}

			if ($ThisFileInfo['mpeg']['video']['raw']['bitrate'] == 0x3FFFF) { // 18 set bits

				$ThisFileInfo['warning'][] = 'This version of getID3() ['.GETID3_VERSION.'] 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']['pixel_aspect_ratio'] = $ThisFileInfo['mpeg']['video']['pixel_aspect_ratio'];
			$ThisFileInfo['video']['lossless']           = false;
			$ThisFileInfo['video']['bits_per_sample']    = 24;

		} else {

			$ThisFileInfo['error'][] = '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?';

		}

		//0x000001B3 begins the sequence_header of every MPEG video stream.