void MediaStreamDevicesController::Accept()

in shell/browser/media/media_stream_devices_controller.cc [78:160]
70 lines of code
18 McCabe index (conditional complexity)

void MediaStreamDevicesController::Accept() {
  // Get the default devices for the request.
  blink::MediaStreamDevices devices;
  if (microphone_requested_ || webcam_requested_) {
    switch (request_.request_type) {
      case blink::MEDIA_OPEN_DEVICE_PEPPER_ONLY: {
        const blink::MediaStreamDevice* device = nullptr;
        // For open device request pick the desired device or fall back to the
        // first available of the given type.
        if (request_.audio_type ==
            blink::mojom::MediaStreamType::DEVICE_AUDIO_CAPTURE) {
          device =
              MediaCaptureDevicesDispatcher::GetInstance()
                  ->GetRequestedAudioDevice(request_.requested_audio_device_id);
          // TODO(wjia): Confirm this is the intended behavior.
          if (!device) {
            device = MediaCaptureDevicesDispatcher::GetInstance()
                         ->GetFirstAvailableAudioDevice();
          }
        } else if (request_.video_type ==
                   blink::mojom::MediaStreamType::DEVICE_VIDEO_CAPTURE) {
          // Pepper API opens only one device at a time.
          device =
              MediaCaptureDevicesDispatcher::GetInstance()
                  ->GetRequestedVideoDevice(request_.requested_video_device_id);
          // TODO(wjia): Confirm this is the intended behavior.
          if (!device) {
            device = MediaCaptureDevicesDispatcher::GetInstance()
                         ->GetFirstAvailableVideoDevice();
          }
        }
        if (device)
          devices.push_back(*device);
        break;
      }
      case blink::MEDIA_GENERATE_STREAM: {
        bool needs_audio_device = microphone_requested_;
        bool needs_video_device = webcam_requested_;

        // Get the exact audio or video device if an id is specified.
        if (!request_.requested_audio_device_id.empty()) {
          const blink::MediaStreamDevice* audio_device =
              MediaCaptureDevicesDispatcher::GetInstance()
                  ->GetRequestedAudioDevice(request_.requested_audio_device_id);
          if (audio_device) {
            devices.push_back(*audio_device);
            needs_audio_device = false;
          }
        }
        if (!request_.requested_video_device_id.empty()) {
          const blink::MediaStreamDevice* video_device =
              MediaCaptureDevicesDispatcher::GetInstance()
                  ->GetRequestedVideoDevice(request_.requested_video_device_id);
          if (video_device) {
            devices.push_back(*video_device);
            needs_video_device = false;
          }
        }

        // If either or both audio and video devices were requested but not
        // specified by id, get the default devices.
        if (needs_audio_device || needs_video_device) {
          MediaCaptureDevicesDispatcher::GetInstance()->GetDefaultDevices(
              needs_audio_device, needs_video_device, &devices);
        }
        break;
      }
      case blink::MEDIA_DEVICE_ACCESS: {
        // Get the default devices for the request.
        MediaCaptureDevicesDispatcher::GetInstance()->GetDefaultDevices(
            microphone_requested_, webcam_requested_, &devices);
        break;
      }
      case blink::MEDIA_DEVICE_UPDATE: {
        NOTREACHED();
        break;
      }
    }
  }

  std::move(callback_).Run(devices, blink::mojom::MediaStreamRequestResult::OK,
                           std::unique_ptr<content::MediaStreamUI>());
}