51 lines
1.7 KiB
JavaScript
51 lines
1.7 KiB
JavaScript
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/*
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* Copyright (c) 2018 The adapter.js project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree.
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*/
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/* eslint-env node */
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'use strict';
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export function shimGetDisplayMedia(window, getSourceId) {
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if (window.navigator.mediaDevices &&
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'getDisplayMedia' in window.navigator.mediaDevices) {
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return;
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}
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if (!(window.navigator.mediaDevices)) {
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return;
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}
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// getSourceId is a function that returns a promise resolving with
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// the sourceId of the screen/window/tab to be shared.
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if (typeof getSourceId !== 'function') {
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console.error('shimGetDisplayMedia: getSourceId argument is not ' +
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'a function');
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return;
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}
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window.navigator.mediaDevices.getDisplayMedia =
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function getDisplayMedia(constraints) {
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return getSourceId(constraints)
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.then(sourceId => {
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const widthSpecified = constraints.video && constraints.video.width;
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const heightSpecified = constraints.video &&
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constraints.video.height;
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const frameRateSpecified = constraints.video &&
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constraints.video.frameRate;
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constraints.video = {
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mandatory: {
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chromeMediaSource: 'desktop',
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chromeMediaSourceId: sourceId,
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maxFrameRate: frameRateSpecified || 3
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}
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};
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if (widthSpecified) {
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constraints.video.mandatory.maxWidth = widthSpecified;
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}
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if (heightSpecified) {
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constraints.video.mandatory.maxHeight = heightSpecified;
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}
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return window.navigator.mediaDevices.getUserMedia(constraints);
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});
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};
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}
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