mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-16 16:16:40 +03:00
Joey Parrish
698d4e5694
It is sometimes useful to load Shaka Player in nodejs, particularly a debug build, to access some internal part of Shaka Player in a nodejs script. For example, I am currently working on an MP4 box transformation for Shaka, but I am doing the R&D in node on the command line rather than in a browser. For this setup to work, Shaka should not refer to browser-specific classes and APIs at load-time. Thankfully, shaka.util.Lazy gives us an easy way to lazy-load those things so that they are not needed at load-time at all. This change uses shaka.util.Lazy to defer a reference to HTMLMediaElement in shaka.util.MediaReadyState. Tangentially related to #2759 Change-Id: I376d2a81cb45e7cbc94be0a88deab3abb08001bf
44 lines
1.3 KiB
JavaScript
44 lines
1.3 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.MediaReadyState');
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goog.require('shaka.util.EventManager');
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goog.require('shaka.util.Lazy');
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shaka.util.MediaReadyState = class {
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/**
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* @param {!HTMLMediaElement} mediaElement
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* @param {number} readyState
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* @param {shaka.util.EventManager} eventManager
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* @param {function()} callback
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*/
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static waitForReadyState(mediaElement, readyState, eventManager, callback) {
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if (readyState == HTMLMediaElement.HAVE_NOTHING ||
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mediaElement.readyState >= readyState) {
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callback();
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} else {
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const MediaReadyState = shaka.util.MediaReadyState;
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const eventName =
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MediaReadyState.READY_STATES_TO_EVENT_NAMES_.value().get(readyState);
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eventManager.listenOnce(mediaElement, eventName, callback);
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}
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}
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};
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/**
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* @const {!shaka.util.Lazy.<!Map.<number, string>>}
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* @private
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*/
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shaka.util.MediaReadyState.READY_STATES_TO_EVENT_NAMES_ =
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new shaka.util.Lazy(() => new Map([
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[HTMLMediaElement.HAVE_METADATA, 'loadedmetadata'],
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[HTMLMediaElement.HAVE_CURRENT_DATA, 'loadeddata'],
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[HTMLMediaElement.HAVE_FUTURE_DATA, 'canplay'],
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[HTMLMediaElement.HAVE_ENOUGH_DATA, 'canplaythrough'],
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]));
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