Hướng dẫn về thiết bị máy ảnh cho Android

suspend fun getWebRtcLiveViewTrait(cameraDevice: HomeDevice) {
 return cameraDevice.type(GoogleCameraDevice).trait(WebRtcLiveView).first {
    it?.metadata?.sourceConnectivity?.connectivityState == ConnectivityState.ONLINE
  }

}

// Start the live view
suspend fun startCameraStream(trait: WebRtcLiveView, offerSdp: String) {
  val response = trait.startLiveView(offerSdp)
  // Response contains three fields (see below)
  return response
}
  ...

// This is used to manage the WebRTC connection
val peerConnection: RTCPeerConnection = ...

   ...

val startResponse = startCameraStream(sdp)
val answerSdp = startResponse?.answerSdp
val sessionDuration = startResponse?.liveSessionDurationSeconds
val mediaSessionId = startResponse?.mediaSessionId

peerConnection.setRemoteDescription(SessionDescription.Type.ANSWER,
                                    answerSdp)

// Assuming camera stream has just been started
suspend fun scheduleExtension(trait: WebRtcLiveView, mediaSessionId: String, liveSessionDurationSeconds: UShort ) {
  delay(liveSessionDurationSeconds - BUFFER_SECONDS * 1000)
  val response = trait.extendLiveView(mediaSessionId)
  // returns how long the session will be live for
  return response.liveSessionDurationSeconds
}

// Make sure camera stream is on
suspend fun setTalkback(isOn: Boolean, trait: WebRtcLiveView, mediaSessionId: String) {
  if(isOn) {
    trait.startTalkback(mediaSessionId)
  } else {
    trait.stopTalkback(mediaSessionId)
  }
}

// Start or stop recording for all connections.
suspend fun setCameraRecording(trait: PushAvStreamTransport, isOn: Boolean) {
  if(isOn) {
    trait.setTransportStatus(TransportStatusEnum.Active)
  } else {
    trait.setTransportStatus(TransportStatusEnum.Inactive)
  }
}

// Get the on/off state
suspend fun onOffState(pushAvStreamTransport: PushAvStreamTransport) {
  return pushAvStreamTransport
    .currentConnections?.any { it.transportStatus == TransportStatusEnum.Active } ?: false
}

// Check if the camera's recording capability is enabled
fun PushAvStreamTransport.recordModeActive(): Boolean {
  return currentConnections?.any { it.transportStatus == TransportStatusEnum.Active } ?: false
}

// Fetch the current connections
suspend fun queryRecordModeState(trait: PushAvStreamTransport) {
  return trait.findTransport().let {
      it.transportConfigurations.any { it.transportStatus == TransportStatusEnum.Active
    }
}

// Turn the device's microphone on or off
suspend fun turnOffMicrophone(disableMicrophone: Boolean, trait: CameraAvStreamManagement) {
  trait.update { setMicrophoneMuted(disableMicrophone) }
}

// Turn audio recording on or off for the device
suspend fun turnOffAudioRecording(disableAudioRecording: Boolean, trait: CameraAvStreamManagement) {
  trait.update { setRecordingMicrophoneMuted(disableAudioRecording) }
}

// Adjust the camera speaker volume
suspend fun adjustSpeakerVolume(volume: Int, trait: CameraAvStreamManagement) {
  trait.update { setSpeakerVolumeLevel(volume.toUbyte()) }
}

// Change the camera's image orientation
val isRotated = false

cameraAvStreamManagement.update { setImageRotation(if (isRotated) 180.toUShort() else 0.toUShort()) }

// Turn night vision on
cameraAvStreamManagement.update {
  setNightVision(CameraAvStreamManagementTrait.TriStateAutoEnum.On)
}

// Turn night vision off
CameraAvStreamManagement.update {
  setNightVision(CameraAvStreamManagementTrait.TriStateAutoEnum.Off)
}

// Set the LED brightness to high
cameraAvStreamManagement.update {
  setStatusLightBrightness(CameraAvStreamManagementTrait.ThreeLevelAutoEnum.High)
}

// Set the LED brightness to low
cameraAvStreamManagement.update {
  setStatusLightBrightness(CameraAvStreamManagementTrait.ThreeLevelAutoEnum.Low)
}

(x1,y1) -- (x2,y1)
   |          |
(x1,y2) -- (x2,y2)

cameraAvStreamManagement
  .update { setViewport(
    CameraAvStreamManagementTrait.ViewportStruct(
      x1 = horizontalRange.rangeStart.roundToInt().toUShort(),
      x2 = horizontalRange.rangeEnd.roundToInt().toUShort(),
      y1 = verticalRange.rangeStart.roundToInt().toUShort(),
      y2 = verticalRange.rangeEnd.roundToInt().toUShort(),
    )
) }

// Create a struct with the new wake-up sensitivity
val toUpdate =  TransportOptionsStruct(
  triggerOptions =
    TransportTriggerOptionsStruct(
      motionSensitivity =
        OptionalValue.present(wakeUpSensitivity.toUByte())
    )
  )

// Get the configurations for active connections
val connections  = pushAvStreamTransport.findTransport().transportConfigurations
  // Update all recording streams with the new transport options.
  for (connection in connections) {
    if (connection.transportOptions.getOrNull()?.streamUsage == StreamUsageEnum.Recording) {
      trait.modifyPushTransport(
        connectionId = connection.connectionId,
        transportOptions = toUpdate,
      )
    }
  }

// Create a struct with the new max event length
// where maxDuration is the length in seconds
val toUpdate =  TransportOptionsStruct(
  triggerOptions =
    TransportTriggerOptionsStruct(
      motionTimeControl =
        OptionalValue.present(
          TransportMotionTriggerTimeControlStruct(maxDuration = it.toUInt())
        )
    )
  )

// Get the configurations for active connections
val connections  = pushAvStreamTransport.findTransport().transportConfigurations
  // Update all recording streams with the new transport options.
  for (connection in connections) {
    if (connection.transportOptions.getOrNull()?.streamUsage == StreamUsageEnum.Recording) {
      trait.modifyPushTransport(
        connectionId = connection.connectionId,
        transportOptions = toUpdate,
      )
    }
  }