open method

@override Future<bool> open(int index)

Opens the camera with the specified index.

Implementation

@override
Future<bool> open(int index) async {
  await release();

  if (_videoDevices.isEmpty) {
    await getDeviceList();
  }
  if (index >= _videoDevices.length) {
    return false;
  }

  final deviceId = _videoDevices[index].deviceId;
  final constraints = dom.MediaStreamConstraints(
    video: dom.MediaTrackConstraints(deviceId: deviceId.toJS),
    audio: false.toJS,
  );

  try {
    _stream = await dom.window.navigator.mediaDevices
        .getUserMedia(constraints)
        .toDart;
  } catch (e) {
    _stream = null;
    return false;
  }

  final tracks = _stream!.getVideoTracks().toDart;
  if (tracks.isEmpty) {
    _stopStream();
    return false;
  }

  // The video element feeds both the platform-view preview and the
  // captureFrame() draws. muted + playsinline is required for autoplay.
  _videoElement = dom.HTMLVideoElement()
    ..autoplay = true
    ..muted = true
    ..setAttribute('playsinline', '')
    ..srcObject = _stream;
  await _play();

  return true;
}