mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-16 16:16:40 +03:00
Álvaro Velad Galván
4f62ce8b24
Ensure generated bundles contain a single license header instead of repeating the same notice across bundled modules. Normalize all copyright years to 2016 and remove duplicate license headers from generated bundles. This reduces the final bundle size while preserving license information in the distributed artifacts.
85 lines
2.0 KiB
JavaScript
85 lines
2.0 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.util.VideoFrameCallbackHandler');
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goog.require('shaka.util.IReleasable');
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/**
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* Handles video frame callbacks using requestVideoFrameCallback.
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*
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* Note: Only one active callback can be registered at a time. Calling `start`
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* will cancel any previously scheduled callback before registering a new one.
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*
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* @implements {shaka.util.IReleasable}
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*/
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shaka.util.VideoFrameCallbackHandler = class {
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/**
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* @param {!HTMLVideoElement} video
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*/
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constructor(video) {
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/** @private {?HTMLVideoElement} */
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this.video_ = video;
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/** @private {?number} */
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this.callbackHandle_ = null;
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/** @private {?VideoFrameRequestCallback} */
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this.boundCallback_ = null;
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}
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/**
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* @param {!function(number, ?VideoFrameMetadata)} callback
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* @param {boolean=} once
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* @return {boolean}
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*/
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start(callback, once = false) {
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this.cancelPending_();
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if (!this.video_ ||
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!('requestVideoFrameCallback' in this.video_)) {
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return false;
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}
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const loopCallback = (now, metadata) => {
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if (this.video_ && this.boundCallback_ === loopCallback) {
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callback(now, metadata);
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}
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// Note: the callback can take some time, so we need to check again
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// that the video and callback are still valid before scheduling another
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// frame.
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if (this.video_ && this.boundCallback_ === loopCallback && !once) {
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this.callbackHandle_ =
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this.video_.requestVideoFrameCallback(loopCallback);
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}
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};
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this.boundCallback_ = loopCallback;
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this.callbackHandle_ = this.video_.requestVideoFrameCallback(loopCallback);
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return true;
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}
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/** @override */
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release() {
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this.cancelPending_();
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this.video_ = null;
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}
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/**
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* @private
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*/
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cancelPending_() {
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if (this.callbackHandle_ !== null) {
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this.video_?.cancelVideoFrameCallback?.(this.callbackHandle_);
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this.callbackHandle_ = null;
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}
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this.boundCallback_ = null;
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}
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};
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