Android 카메라 기기 가이드

suspend fun getWebRtcLiveViewTrait(cameraDevice, cameraDeviceType) {
 return cameraDevice.type(cameraDeviceType).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
}

// Start or stop recording for all connections.
suspend fun setCameraRecording(isOn: Boolean) {
  val pushAvStreamTransport = getPushAvStreamTransport
  if(isOn) {
    pushAvStreamTransport.setTransportStatus(TransportStatusEnum.Active)
  } else {
    pushAvStreamTransport.setTransportStatus(TransportStatusEnum.Inactive)
  }
}

// Get the on/off state
suspend fun onOffState(cameraDevice: HomeDevice, cameraDeviceType) {
  // Query the device for pushAvStreamTransport
  val pushAvTrait = getPushAvStreamTransport()
  return pushAvTrait.recordModeActive()
}

// Check to see 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(cameraDevice: HomeDevice, cameraDeviceType) {
  val pushAvStreamTransport = getPushAvStreamTransport()
  return pushAvStreamTransport.findTransport().let {
      it.transportConfigurations.any { it.transportStatus == TransportStatusEnum.Active
    }
}

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