shaka-player
Version:
DASH/EME video player library
82 lines (70 loc) • 2.42 kB
JavaScript
/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.offline.DownloadInfo');
goog.require('shaka.util.Networking');
goog.require('shaka.util.Uint8ArrayUtils');
goog.requireType('shaka.media.InitSegmentReference');
goog.requireType('shaka.media.SegmentReference');
/**
* An object that represents a single segment, that the storage system will soon
* download, but has not yet started downloading.
*/
shaka.offline.DownloadInfo = class {
/**
* @param {shaka.media.SegmentReference|shaka.media.InitSegmentReference} ref
* @param {number} estimateId
* @param {number} groupId
* @param {boolean} isInitSegment
* @param {number} refPosition
*/
constructor(ref, estimateId, groupId, isInitSegment, refPosition) {
/** @type {shaka.media.SegmentReference|shaka.media.InitSegmentReference} */
this.ref = ref;
/** @type {number} */
this.estimateId = estimateId;
/** @type {number} */
this.groupId = groupId;
/** @type {boolean} */
this.isInitSegment = isInitSegment;
/** @type {number} */
this.refPosition = refPosition;
}
/**
* Creates an ID that encapsulates all important information in the ref, which
* can then be used to check for equality.
* @param {shaka.media.SegmentReference|shaka.media.InitSegmentReference} ref
* @return {string}
*/
static idForSegmentRef(ref) {
const segmentData = ref.getSegmentData(/* allowDeleteOnSingleUse= */ false);
if (segmentData) {
return shaka.util.Uint8ArrayUtils.toBase64(segmentData);
}
// Escape the URIs using encodeURI, to make sure that a weirdly formed URI
// cannot cause two unrelated refs to be considered equivalent.
const removeSprites = (uri) => {
return uri.split('#xywh=')[0];
};
return ref.getUris().map(
(uri) => '{' + encodeURI(removeSprites(uri)) + '}').join('') +
':' + ref.startByte + ':' + ref.endByte;
}
/** @return {string} */
getRefId() {
return shaka.offline.DownloadInfo.idForSegmentRef(this.ref);
}
/**
* @param {shaka.extern.PlayerConfiguration} config
* @return {!shaka.extern.Request}
*/
makeSegmentRequest(config) {
return shaka.util.Networking.createSegmentRequest(
this.ref.getUris(),
this.ref.startByte,
this.ref.endByte,
config.streaming.retryParameters);
}
};