rx-player
Version:
Canal+ HTML5 Video Player
71 lines (70 loc) • 2.87 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.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = getISOBMFFTimingInfos;
var log_1 = require("../../log");
var isobmff_1 = require("../../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}
*/
function getISOBMFFTimingInfos(buffer, isChunked, segment, initTimescale) {
var baseDecodeTime = (0, isobmff_1.getTrackFragmentDecodeTime)(buffer);
if (baseDecodeTime === undefined || initTimescale === undefined) {
return null;
}
var startTime = segment.timestampOffset !== undefined
? baseDecodeTime + segment.timestampOffset * initTimescale
: baseDecodeTime;
var trunDuration = (0, isobmff_1.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_1.default.warn("dash", "Chunked segments should indicate a duration through their trun boxes");
}
return {
time: startTime / initTimescale,
duration: trunDuration !== undefined ? trunDuration / initTimescale : undefined,
};
}
var duration;
var 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.
var 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,
};
}