rx-player
Version:
Canal+ HTML5 Video Player
68 lines (67 loc) • 2.77 kB
JavaScript
/**
* Copyright 2015 CANAL+ Group
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import log from "../../log";
import { getDurationFromTrun, getTrackFragmentDecodeTime, } from "../../parsers/containers/isobmff";
/**
* Get precize start and duration of a chunk.
* @param {UInt8Array} buffer - An ISOBMFF container (at least a `moof` + a
* `mdat` box.
* @param {Boolean} isChunked - If true, the whole segment was chunked into
* multiple parts and buffer is one of them. If false, buffer is the whole
* segment.
* @param {Object} segment
* @param {number|undefined} initTimescale
* @returns {Object}
*/
export default function getISOBMFFTimingInfos(buffer, isChunked, segment, initTimescale) {
const baseDecodeTime = getTrackFragmentDecodeTime(buffer);
if (baseDecodeTime === undefined || initTimescale === undefined) {
return null;
}
let startTime = segment.timestampOffset !== undefined
? baseDecodeTime + segment.timestampOffset * initTimescale
: baseDecodeTime;
let trunDuration = getDurationFromTrun(buffer);
if (startTime < 0) {
if (trunDuration !== undefined) {
trunDuration += startTime; // remove from duration what comes before `0`
}
startTime = 0;
}
if (isChunked || !segment.complete) {
if (trunDuration === undefined) {
log.warn("dash", "Chunked segments should indicate a duration through their trun boxes");
}
return {
time: startTime / initTimescale,
duration: trunDuration !== undefined ? trunDuration / initTimescale : undefined,
};
}
let duration;
const segmentDuration = segment.duration * initTimescale;
// we could always make a mistake when reading a container.
// If the estimate is too far from what the segment seems to imply, take
// the segment infos instead.
const maxDecodeTimeDelta = Math.min(initTimescale * 0.9, segmentDuration / 4);
if (trunDuration !== undefined &&
Math.abs(trunDuration - segmentDuration) <= maxDecodeTimeDelta) {
duration = trunDuration;
}
return {
time: startTime / initTimescale,
duration: duration !== undefined ? duration / initTimescale : duration,
};
}