113 lines
6.5 KiB
PHP
113 lines
6.5 KiB
PHP
<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <getid3@users.sourceforge.net> //
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// available at http://getid3.sourceforge.net ///
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/////////////////////////////////////////////////////////////////
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// //
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// getid3.mpeg.php - part of getID3() //
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// See getid3.readme.txt for more details //
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// //
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/////////////////////////////////////////////////////////////////
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function getMPEGHeaderFilepointer(&$fd, &$ThisFileInfo) {
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$ThisFileInfo['fileformat'] = 'mpeg';
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// Start code 32 bits
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// horizontal frame size 12 bits
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// vertical frame size 12 bits
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// pixel aspect ratio 4 bits
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// frame rate 4 bits
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// bitrate 18 bits
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// marker bit 1 bit
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// VBV buffer size 10 bits
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// constrained parameter flag 1 bit
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// intra quant. matrix flag 1 bit
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// intra quant. matrix values 512 bits (present if matrix flag == 1)
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// non-intra quant. matrix flag 1 bit
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// non-intra quant. matrix values 512 bits (present if matrix flag == 1)
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fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
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$MPEGvideoHeader = fread($fd, FREAD_BUFFER_SIZE);
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$offset = 0;
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// MPEG video information is found as $00 $00 $01 $B3
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$matching_pattern = chr(0x00).chr(0x00).chr(0x01).chr(0xB3);
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while (substr($MPEGvideoHeader, $offset++, 4) !== $matching_pattern) {
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if ($offset >= (strlen($MPEGvideoHeader) - 12)) {
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$MPEGvideoHeader .= fread($fd, FREAD_BUFFER_SIZE);
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$MPEGvideoHeader = substr($MPEGvideoHeader, $offset);
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$offset = 0;
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if (strlen($MPEGvideoHeader) < 12) {
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$ThisFileInfo['error'] .= "\n".'Could not find start of video block before end of file';
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unset($ThisFileInfo['fileformat']);
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return false;
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} elseif (ftell($fd) >= 100000) {
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$ThisFileInfo['error'] .= "\n".'Could not find start of video block in the first 100,000 bytes (this might not be an MPEG-video file?)';
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unset($ThisFileInfo['fileformat']);
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return false;
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}
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}
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}
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$ThisFileInfo['video']['dataformat'] = 'mpeg';
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$offset += (strlen($matching_pattern) - 1);
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$FrameSizeAspectRatioFrameRateDWORD = BigEndian2Int(substr($MPEGvideoHeader, $offset, 4));
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$offset += 4;
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$assortedinformation = BigEndian2Int(substr($MPEGvideoHeader, $offset, 4));
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$offset += 4;
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$ThisFileInfo['mpeg']['video']['raw']['framesize_horizontal'] = ($FrameSizeAspectRatioFrameRateDWORD & 0xFFF00000) >> 20; // 12 bits for horizontal frame size
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$ThisFileInfo['mpeg']['video']['raw']['framesize_vertical'] = ($FrameSizeAspectRatioFrameRateDWORD & 0x000FFF00) >> 8; // 12 bits for vertical frame size
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$ThisFileInfo['mpeg']['video']['raw']['pixel_aspect_ratio'] = ($FrameSizeAspectRatioFrameRateDWORD & 0x000000F0) >> 4;
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$ThisFileInfo['mpeg']['video']['raw']['frame_rate'] = ($FrameSizeAspectRatioFrameRateDWORD & 0x0000000F);
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$ThisFileInfo['mpeg']['video']['framesize_horizontal'] = $ThisFileInfo['mpeg']['video']['raw']['framesize_horizontal'];
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$ThisFileInfo['mpeg']['video']['framesize_vertical'] = $ThisFileInfo['mpeg']['video']['raw']['framesize_vertical'];
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$ThisFileInfo['video']['resolution_x'] = $ThisFileInfo['mpeg']['video']['framesize_horizontal'];
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$ThisFileInfo['video']['resolution_y'] = $ThisFileInfo['mpeg']['video']['framesize_vertical'];
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$ThisFileInfo['mpeg']['video']['pixel_aspect_ratio'] = MPEGvideoAspectRatioLookup($ThisFileInfo['mpeg']['video']['raw']['pixel_aspect_ratio']);
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$ThisFileInfo['mpeg']['video']['pixel_aspect_ratio_text'] = MPEGvideoAspectRatioTextLookup($ThisFileInfo['mpeg']['video']['raw']['pixel_aspect_ratio']);
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$ThisFileInfo['mpeg']['video']['frame_rate'] = MPEGvideoFramerateLookup($ThisFileInfo['mpeg']['video']['raw']['frame_rate']);
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$ThisFileInfo['video']['frame_rate'] = $ThisFileInfo['mpeg']['video']['frame_rate'];
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$ThisFileInfo['mpeg']['video']['raw']['bitrate'] = ($assortedinformation & 0xFFFFC000) >> 14;
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$ThisFileInfo['mpeg']['video']['raw']['marker_bit'] = ($assortedinformation & 0x00002000) >> 13;
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$ThisFileInfo['mpeg']['video']['raw']['vbv_buffer_size'] = ($assortedinformation & 0x00001FF8) >> 3;
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$ThisFileInfo['mpeg']['video']['raw']['constrained_param_flag'] = ($assortedinformation & 0x00000004) >> 2;
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$ThisFileInfo['mpeg']['video']['raw']['intra_quant_flag'] = ($assortedinformation & 0x00000002) >> 1;
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if ($ThisFileInfo['mpeg']['video']['raw']['bitrate'] == 0x3FFFF) { // 18 set bits
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$ThisFileInfo['mpeg']['video']['bitrate_type'] = 'variable';
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$ThisFileInfo['bitrate_mode'] = 'vbr';
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} else {
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$ThisFileInfo['mpeg']['video']['bitrate'] = $ThisFileInfo['mpeg']['video']['raw']['bitrate'] * 400;
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$ThisFileInfo['mpeg']['video']['bitrate_mode'] = 'cbr';
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$ThisFileInfo['video']['bitrate_mode'] = $ThisFileInfo['mpeg']['video']['bitrate_mode'];
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$ThisFileInfo['video']['bitrate'] = $ThisFileInfo['mpeg']['video']['bitrate'];
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}
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$ThisFileInfo['video']['bitrate_mode'] = $ThisFileInfo['mpeg']['video']['bitrate_mode'];
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$ThisFileInfo['video']['bitrate'] = $ThisFileInfo['mpeg']['video']['bitrate'];
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return true;
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}
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function MPEGvideoFramerateLookup($rawframerate) {
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$MPEGvideoFramerateLookup = array(0, 23.976, 24, 25, 29.97, 30, 50, 59.94, 60);
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return (isset($MPEGvideoFramerateLookup[$rawframerate]) ? (float) $MPEGvideoFramerateLookup[$rawframerate] : (float) 0);
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}
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function MPEGvideoAspectRatioLookup($rawaspectratio) {
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$MPEGvideoAspectRatioLookup = array(0, 1, 0.6735, 0.7031, 0.7615, 0.8055, 0.8437, 0.8935, 0.9157, 0.9815, 1.0255, 1.0695, 1.0950, 1.1575, 1.2015, 0);
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return (isset($MPEGvideoAspectRatioLookup[$rawaspectratio]) ? (float) $MPEGvideoAspectRatioLookup[$rawaspectratio] : (float) 0);
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}
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function MPEGvideoAspectRatioTextLookup($rawaspectratio) {
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$MPEGvideoAspectRatioTextLookup = array('forbidden', 'square pixels', '0.6735', '16:9, 625 line, PAL', '0.7615', '0.8055', '16:9, 525 line, NTSC', '0.8935', '4:3, 625 line, PAL, CCIR601', '0.9815', '1.0255', '1.0695', '4:3, 525 line, NTSC, CCIR601', '1.1575', '1.2015', 'reserved');
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return (isset($MPEGvideoAspectRatioTextLookup[$rawaspectratio]) ? $MPEGvideoAspectRatioTextLookup[$rawaspectratio] : '');
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}
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?>
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