80 lines
3 KiB
JavaScript
80 lines
3 KiB
JavaScript
// https://github.com/joeywatts/disable-autogain-control-extension/blob/master/disableAutogain.js
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(function() {
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function setLegacyChromeConstraint(constraint, name, value) {
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if (constraint.mandatory && name in constraint.mandatory) {
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constraint.mandatory[name] = value;
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return;
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}
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if (constraint.optional) {
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const element = constraint.optional.find(opt => name in opt);
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if (element) {
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element[name] = value;
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return;
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}
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}
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// `mandatory` options throw errors for unknown keys, so avoid that by
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// setting it under optional.
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if (!constraint.optional) {
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constraint.optional = [];
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}
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constraint.optional.push({ [name]: value });
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}
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function setConstraint(constraint, name, value) {
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if (constraint.advanced) {
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const element = constraint.advanced.find(opt => name in opt);
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if (element) {
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element[name] = value;
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return;
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}
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}
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constraint[name] = value;
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}
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function disableAutogain(constraints) {
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console.log("Automatically unsetting gain!", constraints);
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if (constraints && constraints.audio) {
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if (typeof constraints.audio !== "object") {
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constraints.audio = {};
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}
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if (constraints.audio.optional || constraints.audio.mandatory) {
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setLegacyChromeConstraint(constraints.audio, "googAutoGainControl", false);
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setLegacyChromeConstraint(constraints.audio, "googAutoGainControl2", false);
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} else {
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setConstraint(constraints.audio, "autoGainControl", false);
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}
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}
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}
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function patchFunction(object, name, createNewFunction) {
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if (name in object) {
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var original = object[name];
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object[name] = createNewFunction(original);
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}
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}
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patchFunction(navigator.mediaDevices, "getUserMedia", function (original) {
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return function getUserMedia(constraints) {
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disableAutogain(constraints);
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return original.call(this, constraints);
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};
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});
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function patchDeprecatedGetUserMedia(original) {
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return function getUserMedia(constraints, success, error) {
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disableAutogain(constraints);
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return original.call(this, constraints, success, error);
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};
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}
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patchFunction(navigator, "getUserMedia", patchDeprecatedGetUserMedia);
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patchFunction(navigator, "mozGetUserMedia", patchDeprecatedGetUserMedia);
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patchFunction(navigator, "webkitGetUserMedia", patchDeprecatedGetUserMedia);
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patchFunction(MediaStreamTrack.prototype, "applyConstraints", function (original) {
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return function applyConstraints(constraints) {
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disableAutogain(constraints);
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return original.call(this, constraints);
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};
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});
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console.log(
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"Disable Autogain by Joey Watts!",
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navigator.mediaDevices.getUserMedia
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);
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})();
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