mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-25 17:45:03 +03:00
Theodore Abshire
509e7b046a
Previously, on manifest updates, embedded captions would vanish in single-period live DASH streams. The problem was based on the specific point in the load order that we added dummy text streams to indicate the presence of embedded captions. This modifies the PlayerInterface for manifest parsers to add a new method passed in, makeTextStreamsForClosedCaptions, which must be called by manifest parsers for new video streams. This also completes an unfinished feature, where new video streams which add new closed captions would not get corresponding text streams. Closes #2811 Change-Id: Iee7499ec950b363cf6839765cc2bd2d01743467d
120 lines
3.1 KiB
JavaScript
120 lines
3.1 KiB
JavaScript
/*! @license
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* Shaka Player
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* Copyright 2016 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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goog.provide('shaka.offline.OfflineManifestParser');
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goog.require('goog.asserts');
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goog.require('shaka.log');
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goog.require('shaka.media.ManifestParser');
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goog.require('shaka.offline.ManifestConverter');
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goog.require('shaka.offline.OfflineUri');
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goog.require('shaka.offline.StorageMuxer');
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goog.require('shaka.util.Error');
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/**
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* @summary Creates a new offline manifest parser.
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* @implements {shaka.extern.ManifestParser}
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*/
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shaka.offline.OfflineManifestParser = class {
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constructor() {
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/** @private {shaka.offline.OfflineUri} */
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this.uri_ = null;
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}
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/** @override */
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configure(config) {
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// No-op
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}
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/** @override */
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async start(uriString, playerInterface) {
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/** @type {shaka.offline.OfflineUri} */
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const uri = shaka.offline.OfflineUri.parse(uriString);
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this.uri_ = uri;
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if (uri == null || !uri.isManifest()) {
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throw new shaka.util.Error(
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shaka.util.Error.Severity.CRITICAL,
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shaka.util.Error.Category.NETWORK,
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shaka.util.Error.Code.MALFORMED_OFFLINE_URI,
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uriString);
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}
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/** @type {!shaka.offline.StorageMuxer} */
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const muxer = new shaka.offline.StorageMuxer();
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try {
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await muxer.init();
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const cell = await muxer.getCell(uri.mechanism(), uri.cell());
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const manifests = await cell.getManifests([uri.key()]);
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const manifest = manifests[0];
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const converter = new shaka.offline.ManifestConverter(
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uri.mechanism(), uri.cell());
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const finalManifest = converter.fromManifestDB(manifest);
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playerInterface.makeTextStreamsForClosedCaptions(finalManifest);
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return finalManifest;
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} finally {
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await muxer.destroy();
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}
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}
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/** @override */
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stop() {
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return Promise.resolve();
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}
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/** @override */
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update() {
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// No-op
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}
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/** @override */
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async onExpirationUpdated(sessionId, expiration) {
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goog.asserts.assert(
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this.uri_,
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'Should not get update event before start has been called');
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/** @type {!shaka.offline.OfflineUri} */
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const uri = this.uri_;
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/** @type {!shaka.offline.StorageMuxer} */
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const muxer = new shaka.offline.StorageMuxer();
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try {
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await muxer.init();
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const cell = await muxer.getCell(uri.mechanism(), uri.cell());
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const manifests = await cell.getManifests([uri.key()]);
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const manifest = manifests[0];
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const foundSession = manifest.sessionIds.includes(sessionId);
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const newExpiration = manifest.expiration == undefined ||
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manifest.expiration > expiration;
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if (foundSession && newExpiration) {
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shaka.log.debug('Updating expiration for stored content');
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await cell.updateManifestExpiration(uri.key(), expiration);
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}
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} catch (e) {
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// Ignore errors with update.
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shaka.log.error('There was an error updating', uri, e);
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} finally {
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await muxer.destroy();
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}
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}
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};
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shaka.media.ManifestParser.registerParserByMime(
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'application/x-offline-manifest',
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() => new shaka.offline.OfflineManifestParser());
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