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;
$amfSerializer = null;
}
private static function createMetadataForStreamFlv($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;
}