mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-25 17:45:03 +03:00
Timothy Drews
fbea2279b3
* Allow segments from different streams (Representations) to coexist in buffer. * Only fetch a single segment at a time. * Remove id field from SegmentReference and remove SegmentRange. * Only start the Streams once the buffer is "full". * Stop DashVideoSource from triggering an extra resync during startup. * Make Task.abort call order deterministic. A follow-up patch is required to handle certain seek patterns in live streams. Issue #51 Change-Id: Ib7c9021471f1ed89323f19764463202b119cb491
137 lines
3.8 KiB
JavaScript
137 lines
3.8 KiB
JavaScript
/**
|
|
* Copyright 2015 Google Inc.
|
|
*
|
|
* 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.
|
|
*
|
|
* @fileoverview Implements an ISegmentIndexSource that constructs a
|
|
* SegmentIndex from a SegmentList.
|
|
*/
|
|
|
|
goog.provide('shaka.dash.ListSegmentIndexSource');
|
|
|
|
goog.require('shaka.asserts');
|
|
goog.require('shaka.log');
|
|
goog.require('shaka.media.ISegmentIndexSource');
|
|
goog.require('shaka.media.SegmentIndex');
|
|
goog.require('shaka.media.SegmentReference');
|
|
goog.require('shaka.util.TypedBind');
|
|
|
|
|
|
|
|
/**
|
|
* Creates a ListSegmentIndexSource.
|
|
*
|
|
* @param {!shaka.dash.mpd.Mpd} mpd
|
|
* @param {!shaka.dash.mpd.Period} period
|
|
* @param {!shaka.dash.mpd.Representation} representation
|
|
* @constructor
|
|
* @struct
|
|
* @implements {shaka.media.ISegmentIndexSource}
|
|
*/
|
|
shaka.dash.ListSegmentIndexSource = function(mpd, period, representation) {
|
|
// TODO: Support live content. Issue #88
|
|
shaka.asserts.assert(mpd.type != 'dynamic');
|
|
shaka.asserts.assert(representation.segmentList);
|
|
shaka.asserts.assert(representation.segmentList.segmentDuration ||
|
|
representation.segmentList.segmentUrls.length == 1);
|
|
shaka.asserts.assert(representation.segmentList.timescale > 0);
|
|
|
|
/** @private {!shaka.dash.mpd.Mpd} */
|
|
this.mpd_ = mpd;
|
|
|
|
/** @private {!shaka.dash.mpd.Period} */
|
|
this.period_ = period;
|
|
|
|
/** @private {!shaka.dash.mpd.Representation} */
|
|
this.representation_ = representation;
|
|
|
|
/** @private {shaka.media.SegmentIndex} */
|
|
this.segmentIndex_ = null;
|
|
};
|
|
|
|
|
|
/**
|
|
* @override
|
|
* @suppress {checkTypes} to set otherwise non-nullable types to null.
|
|
*/
|
|
shaka.dash.ListSegmentIndexSource.prototype.destroy = function() {
|
|
this.mpd_ = null;
|
|
this.period_ = null;
|
|
this.representation_ = null;
|
|
|
|
if (this.segmentIndex_) {
|
|
this.segmentIndex_.destroy();
|
|
this.segmentIndex_ = null;
|
|
}
|
|
};
|
|
|
|
|
|
/** @override */
|
|
shaka.dash.ListSegmentIndexSource.prototype.create = function() {
|
|
if (this.segmentIndex_) {
|
|
return Promise.resolve(this.segmentIndex_);
|
|
}
|
|
|
|
var segmentList = this.representation_.segmentList;
|
|
var lastEndTime = 0;
|
|
|
|
/** @type {!Array.<!shaka.media.SegmentReference>} */
|
|
var references = [];
|
|
|
|
for (var i = 0; i < segmentList.segmentUrls.length; ++i) {
|
|
var segmentUrl = segmentList.segmentUrls[i];
|
|
|
|
// Compute the segment's unscaled start time.
|
|
var startTime;
|
|
if (i == 0) {
|
|
startTime = 0;
|
|
} else {
|
|
startTime = lastEndTime;
|
|
}
|
|
shaka.asserts.assert(startTime >= 0);
|
|
|
|
var endTime = null;
|
|
var scaledEndTime = null;
|
|
|
|
var scaledStartTime = startTime / segmentList.timescale;
|
|
|
|
// If segmentList.segmentDuration is null then there must only be one
|
|
// segment.
|
|
if (segmentList.segmentDuration) {
|
|
endTime = startTime + segmentList.segmentDuration;
|
|
scaledEndTime = endTime / segmentList.timescale;
|
|
}
|
|
|
|
lastEndTime = endTime;
|
|
|
|
var startByte = 0;
|
|
var endByte = null;
|
|
if (segmentUrl.mediaRange) {
|
|
startByte = segmentUrl.mediaRange.begin;
|
|
endByte = segmentUrl.mediaRange.end;
|
|
}
|
|
|
|
references.push(
|
|
new shaka.media.SegmentReference(
|
|
scaledStartTime,
|
|
scaledEndTime,
|
|
startByte,
|
|
endByte,
|
|
new goog.Uri(segmentUrl.mediaUrl)));
|
|
}
|
|
|
|
this.segmentIndex_ = new shaka.media.SegmentIndex(references);
|
|
return Promise.resolve(this.segmentIndex_);
|
|
};
|
|
|