webrtc-adapter
Version:
A shim to insulate apps from WebRTC spec changes and browser prefix differences
210 lines (199 loc) • 7.19 kB
JavaScript
/*
* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree.
*/
/* eslint-env node */
;
var utils = require('../utils');
var logging = utils.log;
// Expose public methods.
module.exports = function(window) {
var browserDetails = utils.detectBrowser(window);
var navigator = window && window.navigator;
var MediaStreamTrack = window && window.MediaStreamTrack;
var shimError_ = function(e) {
return {
name: {
InternalError: 'NotReadableError',
NotSupportedError: 'TypeError',
PermissionDeniedError: 'NotAllowedError',
SecurityError: 'NotAllowedError'
}[e.name] || e.name,
message: {
'The operation is insecure.': 'The request is not allowed by the ' +
'user agent or the platform in the current context.'
}[e.message] || e.message,
constraint: e.constraint,
toString: function() {
return this.name + (this.message && ': ') + this.message;
}
};
};
// getUserMedia constraints shim.
var getUserMedia_ = function(constraints, onSuccess, onError) {
var constraintsToFF37_ = function(c) {
if (typeof c !== 'object' || c.require) {
return c;
}
var require = [];
Object.keys(c).forEach(function(key) {
if (key === 'require' || key === 'advanced' || key === 'mediaSource') {
return;
}
var r = c[key] = (typeof c[key] === 'object') ?
c[key] : {ideal: c[key]};
if (r.min !== undefined ||
r.max !== undefined || r.exact !== undefined) {
require.push(key);
}
if (r.exact !== undefined) {
if (typeof r.exact === 'number') {
r. min = r.max = r.exact;
} else {
c[key] = r.exact;
}
delete r.exact;
}
if (r.ideal !== undefined) {
c.advanced = c.advanced || [];
var oc = {};
if (typeof r.ideal === 'number') {
oc[key] = {min: r.ideal, max: r.ideal};
} else {
oc[key] = r.ideal;
}
c.advanced.push(oc);
delete r.ideal;
if (!Object.keys(r).length) {
delete c[key];
}
}
});
if (require.length) {
c.require = require;
}
return c;
};
constraints = JSON.parse(JSON.stringify(constraints));
if (browserDetails.version < 38) {
logging('spec: ' + JSON.stringify(constraints));
if (constraints.audio) {
constraints.audio = constraintsToFF37_(constraints.audio);
}
if (constraints.video) {
constraints.video = constraintsToFF37_(constraints.video);
}
logging('ff37: ' + JSON.stringify(constraints));
}
return navigator.mozGetUserMedia(constraints, onSuccess, function(e) {
onError(shimError_(e));
});
};
// Returns the result of getUserMedia as a Promise.
var getUserMediaPromise_ = function(constraints) {
return new Promise(function(resolve, reject) {
getUserMedia_(constraints, resolve, reject);
});
};
// Shim for mediaDevices on older versions.
if (!navigator.mediaDevices) {
navigator.mediaDevices = {getUserMedia: getUserMediaPromise_,
addEventListener: function() { },
removeEventListener: function() { }
};
}
navigator.mediaDevices.enumerateDevices =
navigator.mediaDevices.enumerateDevices || function() {
return new Promise(function(resolve) {
var infos = [
{kind: 'audioinput', deviceId: 'default', label: '', groupId: ''},
{kind: 'videoinput', deviceId: 'default', label: '', groupId: ''}
];
resolve(infos);
});
};
if (browserDetails.version < 41) {
// Work around http://bugzil.la/1169665
var orgEnumerateDevices =
navigator.mediaDevices.enumerateDevices.bind(navigator.mediaDevices);
navigator.mediaDevices.enumerateDevices = function() {
return orgEnumerateDevices().then(undefined, function(e) {
if (e.name === 'NotFoundError') {
return [];
}
throw e;
});
};
}
if (browserDetails.version < 49) {
var origGetUserMedia = navigator.mediaDevices.getUserMedia.
bind(navigator.mediaDevices);
navigator.mediaDevices.getUserMedia = function(c) {
return origGetUserMedia(c).then(function(stream) {
// Work around https://bugzil.la/802326
if (c.audio && !stream.getAudioTracks().length ||
c.video && !stream.getVideoTracks().length) {
stream.getTracks().forEach(function(track) {
track.stop();
});
throw new DOMException('The object can not be found here.',
'NotFoundError');
}
return stream;
}, function(e) {
return Promise.reject(shimError_(e));
});
};
}
if (!(browserDetails.version > 55 &&
'autoGainControl' in navigator.mediaDevices.getSupportedConstraints())) {
var remap = function(obj, a, b) {
if (a in obj && !(b in obj)) {
obj[b] = obj[a];
delete obj[a];
}
};
var nativeGetUserMedia = navigator.mediaDevices.getUserMedia.
bind(navigator.mediaDevices);
navigator.mediaDevices.getUserMedia = function(c) {
if (typeof c === 'object' && typeof c.audio === 'object') {
c = JSON.parse(JSON.stringify(c));
remap(c.audio, 'autoGainControl', 'mozAutoGainControl');
remap(c.audio, 'noiseSuppression', 'mozNoiseSuppression');
}
return nativeGetUserMedia(c);
};
if (MediaStreamTrack && MediaStreamTrack.prototype.getSettings) {
var nativeGetSettings = MediaStreamTrack.prototype.getSettings;
MediaStreamTrack.prototype.getSettings = function() {
var obj = nativeGetSettings.apply(this, arguments);
remap(obj, 'mozAutoGainControl', 'autoGainControl');
remap(obj, 'mozNoiseSuppression', 'noiseSuppression');
return obj;
};
}
if (MediaStreamTrack && MediaStreamTrack.prototype.applyConstraints) {
var nativeApplyConstraints = MediaStreamTrack.prototype.applyConstraints;
MediaStreamTrack.prototype.applyConstraints = function(c) {
if (this.kind === 'audio' && typeof c === 'object') {
c = JSON.parse(JSON.stringify(c));
remap(c, 'autoGainControl', 'mozAutoGainControl');
remap(c, 'noiseSuppression', 'mozNoiseSuppression');
}
return nativeApplyConstraints.apply(this, [c]);
};
}
}
navigator.getUserMedia = function(constraints, onSuccess, onError) {
if (browserDetails.version < 44) {
return getUserMedia_(constraints, onSuccess, onError);
}
// Replace Firefox 44+'s deprecation warning with unprefixed version.
console.warn('navigator.getUserMedia has been replaced by ' +
'navigator.mediaDevices.getUserMedia');
navigator.mediaDevices.getUserMedia(constraints).then(onSuccess, onError);
};
};