示例#1
0
 public function write()
 {
     $amfSerializer = new FLV_Util_AMFSerialize();
     $metadata_data = array();
     // theses will be used as placeholders for dynamic data
     $metadata_data["canSeekToEnd"] = true;
     $metadata_data["duration"] = (int) ($this->duration / 1000);
     $metadata_data["timeOffset"] = 0;
     $metadata_data["bytesOffset"] = 0;
     // because of akamai seek limitation we want to limit metadata size to 16kb
     // 15K / 2 (times & positions arrays ) / 8 (bytes each) ~ 850
     // we will skip keyframes in order to use at most 850 of them
     $kf_cnt = count($this->keyframeTimes);
     // if there are more than 1 keyframe per second and file size < 100MB its probably and edit flavor and we should maintain all KF
     // we serve the file from our server and not the cdn anyway because the cdn cant clip the file
     $lastKF = $lastKFPos = 0;
     if ($kf_cnt) {
         $lastKF = $this->keyframeTimes[$kf_cnt - 1] / 1000;
         $lastKFPos = $this->keyframeBytes[$kf_cnt - 1] / (1000 * 1000);
     }
     if ($kf_cnt > $lastKF && ($lastKFPos < 100 && !$this instanceof FlvMetadataAudio)) {
         $new_kf_step = 1;
     } else {
         $new_kf_step = max(1, $kf_cnt / 850);
     }
     $new_kf = array();
     $new_fp = array();
     $i = 0;
     $new_kf_pos = 0;
     while ($i < $kf_cnt) {
         $new_kf[] = $this->keyframeTimes[$i];
         $new_fp[] = $this->keyframeBytes[$i];
         $new_kf_pos += $new_kf_step;
         $i = floor($new_kf_pos);
     }
     $metadata_data["times"] = $new_kf;
     $metadata_data["filepositions"] = $new_fp;
     $data = $amfSerializer->serialize('onMetaData') . $amfSerializer->serialize($metadata_data);
     $data_len = strlen($data);
     $metatagSize = myFlvHandler::TAG_WRAPPER_SIZE + $data_len;
     for ($i = 0; $i < count($new_kf); ++$i) {
         $metadata_data["filepositions"][$i] += $metatagSize;
     }
     $res = $amfSerializer->serialize('onMetaData') . $amfSerializer->serialize($metadata_data);
     $meta_tag = myFlvHandler::createMetadataTag($data);
     kFile::safeFilePutContents($this->info_file_name, $meta_tag);
     // sync - OK
     $meta_tag = null;
     $amfSerializer = null;
 }
示例#2
0
 private static function createMetadataForStreamFlv($filePath, $assets, $streamInfo, $addPadding, $duration = null)
 {
     $metadata_content = self::getMetadataFromCache($filePath, $streamInfo, $addPadding);
     if ($metadata_content) {
         return $metadata_content;
     }
     list($sizeList, $timeList, $filePositionsList) = self::iterateAssets($assets, $streamInfo, $addPadding, false);
     $amfSerializer = new FLV_Util_AMFSerialize();
     $metadata = array();
     $metadata_data = array();
     if ($duration) {
         $metadata_data["duration"] = (int) ($duration / 1000);
     }
     $metadata_data["bufferSizes"] = $sizeList;
     $metadata_data["times"] = $timeList;
     $metadata_data["filepositions"] = $filePositionsList;
     $res = $amfSerializer->serialize('onMetaData') . $amfSerializer->serialize($metadata_data);
     $data_len = strlen($res);
     // first create a metadata tag with it's real size - this will be the offset of all the rest of the tags
     // create a metadata tag
     $metadata_size = myFlvHandler::TAG_WRAPPER_SIZE + $data_len;
     $metatagEndOffset = myFlvHandler::getHeaderSize() + $metadata_size;
     // second - create the real metadata tag with the values of all the following tags with correct offsets
     for ($i = 0; $i < count($sizeList); ++$i) {
         $sizeList[$i] += $metatagEndOffset;
     }
     for ($i = 0; $i < count($filePositionsList); ++$i) {
         $filePositionsList[$i] += $metatagEndOffset;
     }
     $metadata_data["bufferSizes"] = $sizeList;
     $metadata_data["filepositions"] = $filePositionsList;
     $res = $amfSerializer->serialize('onMetaData') . $amfSerializer->serialize($metadata_data);
     $metadata_content = myFlvHandler::createMetadataTag($res);
     self::setMetadataInCache($filePath, $streamInfo, $addPadding, $metadata_content);
     return $metadata_content;
 }