2013-11-09 04:11:22 -05:00
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<?php
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require dirname(__FILE__) . '/matroska.php';
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2013-11-30 05:07:05 -05:00
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// Make video from single VPx keyframe
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function muxVPxFrame($width, $height, $codecID, $data) {
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$size = strlen($data);
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$lenSeekHead = 61;
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$lenCues = 18;
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$ebml = encodeElement('EBML',
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encodeElement('EBMLVersion', "\x01")
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. encodeElement('EBMLReadVersion', "\x01")
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. encodeElement('EBMLMaxIDLength', "\x04")
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. encodeElement('EBMLMaxSizeLength', "\x08")
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. encodeElement('DocType', "webm")
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. encodeElement('DocTypeVersion', "\x02")
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. encodeElement('DocTypeReadVersion', "\x02")
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);
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$info = encodeElement('Info',
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encodeElement('TimecodeScale', "\x0F\x42\x40")
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. encodeElement('Duration', "\x41\x20\x00\x00")
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. encodeElement('MuxingApp', 'f')
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. encodeElement('WritingApp', 'f')
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);
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$tracks = encodeElement('Tracks',
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encodeElement('TrackEntry',
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encodeElement('TrackNumber', "\x01")
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. encodeElement('TrackUID', "\x01")
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. encodeElement('TrackType', "\x01")
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. encodeElement('DefaultDuration', "\x98\x96\x80")
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. encodeElement('CodecID', $codecID)
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. encodeElement('Video',
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encodeElement('PixelWidth', pack('N', $width))
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. encodeElement('PixelHeight', pack('N', $height))
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)
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)
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);
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$cues = encodeElement('Cues',
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encodeElement('CuePoint',
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encodeElement('CueTime', "\x00")
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. encodeElement('CueTrackPositions',
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encodeElement('CueTrack', "\x01")
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. encodeElement('CueClusterPosition', chr($lenSeekHead + strlen($info) + strlen($tracks) + $lenCues))
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)
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)
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);
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$seekHead = encodeElement('SeekHead',
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encodeElement('Seek',
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encodeElement('SeekID', encodeElementName('Info'))
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. encodeElement('SeekPosition', chr($lenSeekHead))
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)
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. encodeElement('Seek',
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encodeElement('SeekID', encodeElementName('Tracks'))
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. encodeElement('SeekPosition', chr($lenSeekHead + strlen($info)))
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)
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. encodeElement('Seek',
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encodeElement('SeekID', encodeElementName('Cues'))
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. encodeElement('SeekPosition', chr($lenSeekHead + strlen($info) + strlen($tracks)))
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)
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. encodeElement('Seek',
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encodeElement('SeekID', encodeElementName('Cluster'))
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. encodeElement('SeekPosition', chr($lenSeekHead + strlen($info) + strlen($tracks) + $lenCues))
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)
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);
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$cluster = "\x1F\x43\xB6\x75\x08" . pack('N', $size + 13) . (
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//. encodeElement('Cluster',
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encodeElement('Timecode', "\x00")
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. "\xA3\x08" . pack('N', $size + 4) . ("\x81\x00\x00\x80" . $data)
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//. encodeElement('SimpleBlock', "\x81\x00\x00\x80" . $data)
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);
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$segment = "\x18\x53\x80\x67\x08" . pack('N', $size + 173) . (
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// . encodeElement('Segment',
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$seekHead . $info . $tracks . $cues . $cluster
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);
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return $ebml . $segment;
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2013-11-09 04:11:22 -05:00
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}
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// Locate first VPx keyframe of track $trackNumber after timecode $skip
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function firstVPxFrame($segment, $trackNumber, $skip=0) {
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foreach($segment as $x1) {
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if ($x1->name() == 'Cluster') {
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$cluserTimecode = $x1->Get('Timecode');
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foreach($x1 as $x2) {
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$blockRaw = NULL;
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if ($x2->name() == 'SimpleBlock') {
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$blockRaw = $x2->value();
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} elseif ($x2->name() == 'BlockGroup') {
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$blockRaw = $x2->get('Block');
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}
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if (isset($blockRaw)) {
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$block = new MatroskaBlock($blockRaw);
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if ($block->trackNumber == $trackNumber) {
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$frame = $block->frames[0];
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if ($block->keyframe) {
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if (!isset($cluserTimecode) || $cluserTimecode + $block->timecode >= $skip) {
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return $frame;
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} elseif (!isset($frame1)) {
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$frame1 = $frame;
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}
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}
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}
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}
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}
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}
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}
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return isset($frame1) ? $frame1 : NULL;
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}
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function videoData($filename) {
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$data = array();
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// Open file
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$fileHandle = fopen($filename, 'rb');
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if (!$fileHandle) {
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error_log('could not open file');
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return $data;
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}
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try {
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$root = readMatroska($fileHandle);
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// Locate segment information and tracks
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$segment = $root->get('Segment');
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if (!isset($segment)) throw new Exception('missing Segment element');
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// Get segment information
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$info = $segment->get('Info');
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if (isset($info)) {
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$timecodeScale = $info->get('TimecodeScale');
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$duration = $info->get('Duration');
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if (isset($timecodeScale) && isset($duration)) {
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$data['duration'] = 1e-9 * $timecodeScale * $duration;
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}
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}
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// Locate video track
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$tracks = $segment->get('Tracks');
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if (!isset($tracks)) throw new Exception('missing Tracks element');
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foreach($tracks as $trackEntry) {
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if ($trackEntry->name() == 'TrackEntry' && $trackEntry->get('TrackType') == 1) {
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$videoTrack = $trackEntry;
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break;
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}
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}
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if (!isset($videoTrack)) throw new Exception('no video track');
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// Get track information
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$videoAttr = $videoTrack->get('Video');
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if (isset($videoAttr)) {
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$pixelWidth = $videoAttr->get('PixelWidth');
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$pixelHeight = $videoAttr->get('PixelHeight');
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if ($pixelWidth == 0 || $pixelHeight == 0) {
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error_log('bad PixelWidth/PixelHeight');
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$pixelWidth = NULL;
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$pixelHeight = NULL;
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}
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$data['width'] = $videoAttr->get('DisplayWidth', $pixelWidth);
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$data['height'] = $videoAttr->get('DisplayHeight', $pixelHeight);
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if ($data['width'] == 0 || $data['height'] == 0) {
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error_log('bad DisplayWidth/DisplayHeight');
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$data['width'] = $pixelWidth;
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$data['height'] = $pixelHeight;
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}
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}
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// Extract frame to use as thumbnail
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$trackNumber = $videoTrack->get('TrackNumber');
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if (!isset($trackNumber)) throw new Exception('missing track number');
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$codecID = $videoTrack->get('CodecID');
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if ($codecID != 'V_VP8' && $codecID != 'V_VP9') throw new Exception('codec is not VP8 or VP9');
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if (!isset($pixelWidth) || !isset($pixelHeight)) throw new Exception('no width or height');
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if (isset($data['duration']) && $data['duration'] >= 5) {
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$skip = 1e9 / $timecodeScale;
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} else {
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$skip = 0;
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}
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$frame = firstVPxFrame($segment, $trackNumber, $skip);
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if (!isset($frame)) throw new Exception('no keyframes');
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2013-11-30 05:07:05 -05:00
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$data['frame'] = muxVPxFrame($pixelWidth, $pixelHeight, $codecID, $frame->readAll());
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2013-11-09 04:11:22 -05:00
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} catch (Exception $e) {
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error_log($e->getMessage());
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}
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fclose($fileHandle);
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return $data;
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}
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