mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-15 16:06:41 +03:00
Aaron Vaage
b834f75b18
Before we would track streams in the active stream map, but many times we would then need to look-up what variant used those streams. This changes the active stream map to track variants, simplifying the internal structure of the active stream map and the usage of the map. Change-Id: I7f6d67cc6d338266ed866e461dce24db8e603efc
124 lines
3.3 KiB
JavaScript
124 lines
3.3 KiB
JavaScript
/**
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* @license
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* Copyright 2016 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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goog.provide('shaka.media.ActiveStreamMap');
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/**
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* A structure used to track which streams were last used in any given period.
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*
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* @final
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*/
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shaka.media.ActiveStreamMap = class {
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constructor() {
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/**
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* A mapping between a period and the content last streamed in that period.
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*
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* @private {!Map.<shaka.extern.Period, !shaka.media.ActiveStreamMap.Frame>}
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*/
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this.history_ = new Map();
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}
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/**
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* Clear the history.
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*/
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clear() {
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// Clear the map to release references to the periods (the key). This
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// assumes that the references will be broken by doing this.
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this.history_.clear();
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}
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/**
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* Set the variant that was last playing in |period|. Setting it to |null| is
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* the same as saying "we were playing no variant in this period".
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*
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* @param {shaka.extern.Period} period
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* @param {?shaka.extern.Variant} variant
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*/
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useVariant(period, variant) {
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this.getFrameFor_(period).variant = variant;
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}
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/**
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* Set the text stream that was last displayed in |period|. Setting it to
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* |null| is the same as saying "we were displaying no text in this period".
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*
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* @param {shaka.extern.Period} period
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* @param {?shaka.extern.Stream} stream
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*/
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useText(period, stream) {
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this.getFrameFor_(period).text = stream;
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}
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/**
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* Get the variant that was playing in the given period. If no variant was
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* playing this period or the period had not started playing, then |null| will
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* be returned.
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*
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* @param {shaka.extern.Period} period
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* @return {?shaka.extern.Variant}
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*/
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getVariant(period) {
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return this.getFrameFor_(period).variant;
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}
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/**
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* Get the text stream that was playing in the given period. If no text
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* stream was playing this period or the period had not started playing, then
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* |null| will be returned.
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*
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* @param {shaka.extern.Period} period
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* @return {?shaka.extern.Stream}
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*/
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getText(period) {
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return this.getFrameFor_(period).text;
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}
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/**
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* Get the frame for a period. This will ensure that a frame exists for the
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* given period.
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*
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* @param {shaka.extern.Period} period
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* @return {!shaka.media.ActiveStreamMap.Frame}
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* @private
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*/
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getFrameFor_(period) {
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if (!this.history_.has(period)) {
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const frame = new shaka.media.ActiveStreamMap.Frame();
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this.history_.set(period, frame);
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}
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return this.history_.get(period);
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}
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};
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/**
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* A structure used to track which streams were played during a specific
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* time frame.
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*
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* @final
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*/
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shaka.media.ActiveStreamMap.Frame = class {
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constructor() {
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/** @type {?shaka.extern.Variant} */
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this.variant = null;
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/** @type {?shaka.extern.Stream} */
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this.text = null;
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}
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};
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