private async bindAudioMix()

in src/audiomixcontroller/DefaultAudioMixController.ts [93:158]
51 lines of code
15 McCabe index (conditional complexity)

  private async bindAudioMix(): Promise<void> {
    if (!this.audioElement) {
      return;
    }

    const previousStream = this.audioElement.srcObject as MediaStream;

    if (this.audioStream) {
      this.audioElement.srcObject = this.audioStream;
    }

    if (previousStream !== this.audioStream) {
      this.forEachObserver((observer: AudioMixObserver) => {
        if (previousStream) {
          observer.meetingAudioStreamBecameInactive(previousStream);
        }
        if (this.audioStream) {
          observer.meetingAudioStreamBecameActive(this.audioStream);
        }
      });
    }

    // In usual operation, the output device is undefined, and so is the element
    // sink ID. In this case, don't throw an error -- we're being called as a side
    // effect of just binding the audio element, not choosing an output device.
    const shouldSetSinkId =
      this.audioDevice?.deviceId !== (this.audioElement as AudioElementWithSinkId).sinkId;

    if (
      shouldSetSinkId &&
      typeof (this.audioElement as AudioElementWithSinkId).sinkId === 'undefined'
    ) {
      throw new Error(
        'Cannot select audio output device. This browser does not support setSinkId.'
      );
    }

    const newSinkId = this.audioDevice ? this.audioDevice.deviceId : '';
    const oldSinkId: string = (this.audioElement as AudioElementWithSinkId).sinkId;
    if (newSinkId === oldSinkId) {
      return;
    }

    // Take the existing stream and temporarily unbind it while we change
    // the sink ID.

    const existingAudioElement: AudioElementWithSinkId = this
      .audioElement as AudioElementWithSinkId;
    const existingStream = this.audioStream;
    if (this.browserBehavior.hasChromiumWebRTC()) {
      existingAudioElement.srcObject = null;
    }

    if (shouldSetSinkId) {
      try {
        await existingAudioElement.setSinkId(newSinkId);
      } catch (error) {
        this.logger?.error(`Failed to set sinkId for audio element: ${error}`);
        throw error;
      }
    }

    if (this.browserBehavior.hasChromiumWebRTC()) {
      existingAudioElement.srcObject = existingStream;
    }
  }