mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-14 15:56:38 +03:00
Joey Parrish
08cec995c9
This replaces find/get callbacks in Stream with a SegmentIndex. With the exception of DASH's SegmentTemplate+duration, all manifests were already backed by SegmentIndex. Now, all manifests are backed by SegmentIndex. This will simplify Period-flattening, in which all tracks will be represented by a list of segments, some of which come from different Periods. The SegmentIndex in Stream will not be created until createSegmentIndex is called. Prior to this change, the find/get callbacks could be invoked without createSegmentIndex() in some cases (excluding DASH's SegmentBase), which some lazy tests took advantage of. Now that find/get are methods on SegmentIndex, createSegmentIndex must be called in all cases. The tests have been updated accordingly. Making SegmentIndex generation async in all cases exposed some issues with the parser context being modified in-place between one Representation and the next. So the parser now makes a shallow copy of the context before it is bound into an async callback. To facilitate updating the SegmentIndex for SegmentTemplate+duration content, SegmentIndex now has a method to update its list on a timer. Once per segment duration, the index will be updated to add and remove SegmentReferences. The initial expansion of SegmentTemplate+duration will be limited to a relatively small number of segments, to avoid excessive CPU or memory consumption. This defaults to 1000 segments, but is configurable. Issue #1339 Change-Id: I99c007b1096c3b396d04a729750cd7b743cb899d
104 lines
2.9 KiB
JavaScript
104 lines
2.9 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.util.ObjectUtils');
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shaka.util.ObjectUtils = class {
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/**
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* Performs a deep clone of the given simple object. This does not copy
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* prototypes, custom properties (e.g. read-only), or multiple references to
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* the same object. If the caller needs these fields, it will need to set
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* them after this returns.
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*
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* @template T
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* @param {T} arg
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* @return {T}
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*/
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static cloneObject(arg) {
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const seenObjects = new Set();
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// This recursively clones the value |val|, using the captured variable
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// |seenObjects| to track the objects we have already cloned.
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const clone = (val) => {
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switch (typeof val) {
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case 'undefined':
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case 'boolean':
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case 'number':
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case 'string':
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case 'symbol':
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case 'function':
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return val;
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case 'object':
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default: {
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// typeof null === 'object'
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if (!val) {
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return val;
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}
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// This covers Uint8Array and friends, even without a TypedArray
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// base-class constructor.
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const isTypedArray =
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val.buffer && val.buffer.constructor == ArrayBuffer;
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if (isTypedArray) {
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return val;
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}
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if (seenObjects.has(val)) {
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return null;
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}
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const isArray = val.constructor == Array;
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if (val.constructor != Object && !isArray) {
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return null;
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}
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seenObjects.add(val);
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const ret = isArray ? [] : {};
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// Note |name| will equal a number for arrays.
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for (const name in val) {
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ret[name] = clone(val[name]);
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}
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// Length is a non-enumerable property, but we should copy it over in
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// case it is not the default.
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if (isArray) {
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ret.length = val.length;
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}
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return ret;
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}
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}
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};
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return clone(arg);
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}
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/**
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* Performs a shallow clone of the given simple object. This does not copy
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* prototypes or custom properties (e.g. read-only).
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*
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* @template T
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* @param {T} original
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* @return {T}
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*/
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static shallowCloneObject(original) {
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const clone = /** @type {?} */({});
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for (const k in original) {
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clone[k] = original[k];
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}
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return clone;
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}
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};
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