132 lines
5.4 KiB
PHP
132 lines
5.4 KiB
PHP
<?php
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require dirname(__FILE__) . '/matroska.php';
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// Header for single VPx keyframe
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function vpxFrameHeader($size, $width, $height, $codecID) {
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return "\x1A\x45\xDF\xA3\x9F\x42\x86\x81\x01\x42\xF7\x81\x01\x42\xF2\x81"
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. "\x04\x42\xF3\x81\x08\x42\x82\x84\x77\x65\x62\x6D\x42\x87\x81\x02"
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. "\x42\x85\x81\x02\x18\x53\x80\x67\x08" . pack('N', $size + 173) . "\x11\x4D\x9B"
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. "\x74\xB8\x4D\xBB\x8B\x53\xAB\x84\x15\x49\xA9\x66\x53\xAC\x81\x3D"
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. "\x4D\xBB\x8B\x53\xAB\x84\x16\x54\xAE\x6B\x53\xAC\x81\x58\x4D\xBB"
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. "\x8B\x53\xAB\x84\x1C\x53\xBB\x6B\x53\xAC\x81\x85\x4D\xBB\x8B\x53"
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. "\xAB\x84\x1F\x43\xB6\x75\x53\xAC\x81\x97\x15\x49\xA9\x66\x96\x2A"
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. "\xD7\xB1\x83\x0F\x42\x40\x44\x89\x84\x41\x20\x00\x00\x4D\x80\x81"
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. "\x66\x57\x41\x81\x66\x16\x54\xAE\x6B\xA8\xAE\xA6\xD7\x81\x01\x73"
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. "\xC5\x81\x01\x83\x81\x01\x23\xE3\x83\x83\x98\x96\x80\x86\x85" . $codecID
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. "\xE0\x8C\xB0\x84" . pack('N', $width) . "\xBA\x84" . pack('N', $height)
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. "\x1C\x53\xBB\x6B\x8D\xBB\x8B\xB3\x81\x00\xB7\x86\xF7\x81"
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. "\x01\xF1\x81\x97\x1F\x43\xB6\x75\x08" . pack('N', $size + 13) . "\xE7\x81\x00"
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. "\xA3\x08" . pack('N', $size + 4) . "\x81\x00\x00\x80";
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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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$data['frame'] = vpxFrameHeader($frame->size(), $pixelWidth, $pixelHeight, $codecID) . $frame->readAll();
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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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