bigbluebutton-Github/bigbluebutton-html5/imports/utils/ios-webview-audio-polyfills.js

const iosWebviewAudioPolyfills = function () {
  function shimRemoteStreamsAPI(window) {
    if (!('getRemoteStreams' in window.RTCPeerConnection.prototype)) {
      window.RTCPeerConnection.prototype.getRemoteStreams = function () {
        return this._remoteStreams ? this._remoteStreams : [];
      };
    }
    if (!('onaddstream' in window.RTCPeerConnection.prototype)) {
      Object.defineProperty(window.RTCPeerConnection.prototype, 'onaddstream', {
        get: function get() {
          return this._onaddstream;
        },
        set: function set(f) {
          const _this3 = this;

          if (this._onaddstream) {
            this.removeEventListener('addstream', this._onaddstream);
            this.removeEventListener('track', this._onaddstreampoly);
          }
          this.addEventListener('addstream', this._onaddstream = f);
          this.addEventListener('track', this._onaddstreampoly = function (e) {
            e.streams.forEach((stream) => {
              if (!_this3._remoteStreams) {
                _this3._remoteStreams = [];
              }
              if (_this3._remoteStreams.includes(stream)) {
                return;
              }
              _this3._remoteStreams.push(stream);
              const event = new Event('addstream');
              event.stream = stream;
              _this3.dispatchEvent(event);
            });
          });
        },
      });
      const origSetRemoteDescription = window.RTCPeerConnection.prototype.setRemoteDescription;
      window.RTCPeerConnection.prototype.setRemoteDescription = function () {
        const pc = this;
        if (!this._onaddstreampoly) {
          this.addEventListener('track', this._onaddstreampoly = function (e) {
            e.streams.forEach((stream) => {
              if (!pc._remoteStreams) {
                pc._remoteStreams = [];
              }
              if (pc._remoteStreams.indexOf(stream) >= 0) {
                return;
              }
              pc._remoteStreams.push(stream);
              const event = new Event('addstream');
              event.stream = stream;
              pc.dispatchEvent(event);
            });
          });
        }
        return origSetRemoteDescription.apply(pc, arguments);
      };
    }
  }

  function shimCallbacksAPI(window) {
    const prototype = window.RTCPeerConnection.prototype;
    const createOffer = prototype.createOffer;
    const setLocalDescription = prototype.setLocalDescription;
    const setRemoteDescription = prototype.setRemoteDescription;

    prototype.createOffer = function (successCallback, failureCallback) {
      const options = arguments.length >= 2 ? arguments[2] : arguments[0];
      const promise = createOffer.apply(this, [options]);
      if (!failureCallback) {
        return promise;
      }
      promise.then(successCallback, failureCallback);
      return Promise.resolve();
    };

    prototype.setLocalDescription = function withCallback(description, successCallback, failureCallback) {
      const promise = setLocalDescription.apply(this, [description]);
      if (!failureCallback) {
        return promise;
      }
      promise.then(successCallback, failureCallback);
      return Promise.resolve();
    };

    prototype.setRemoteDescription = function withCallback(description, successCallback, failureCallback) {
      const promise = setRemoteDescription.apply(this, [description]);
      if (!failureCallback) {
        return promise;
      }
      promise.then(successCallback, failureCallback);
      return Promise.resolve();
    };
  }

  shimCallbacksAPI(window);
  shimRemoteStreamsAPI(window);
};

export default iosWebviewAudioPolyfills;