Hướng dẫn sử dụng thiết bị camera cho iOS

public func sendOffer(offerSdp: String) async throws
-> (answerSdp: String, mediaSessionId: String, liveViewDuration: TimeInterval)
{
  do {
    // Sending StartLiveView command
    let response = try await liveViewTrait.startLiveView(
      offerSdp: offerSdp
    )
    // Received StartLiveView response
    return (
      answerSdp: response.answerSdp,
      mediaSessionId: response.mediaSessionId,
      liveViewDuration: TimeInterval(response.liveSessionDurationSeconds)
    )
  } catch {
    // Failed to send StartLiveView command
    throw error
  }
}

public func extendLiveView(mediaSessionId: String) async throws {
  do {
    // Extending live view
    let extendedDuration = try await liveViewTrait.extendLiveView(mediaSessionId: mediaSessionId)
  } catch {
    // Failed to extend live view
    throw error
  }
}

public func toggleTwoWayTalk(isOn: Bool, mediaSessionId: String) async throws {
  do {
    if isOn {
      try await liveViewTrait.startTalkback(mediaSessionId: mediaSessionId)
    } else {
      try await liveViewTrait.stopTalkback(mediaSessionId: mediaSessionId)
    }
  } catch {
    throw HomeError.commandFailed("Failed to toggle twoWayTalk: \(error)")
  }
}

public func toggleIsRecording(isOn: Bool) {
  self.uiState = .loading

  guard let pushAvStreamTransportTrait else {
    // PushAvStreamTransportTrait not found.
    return
  }
  Task {
    do {
      try await pushAvStreamTransportTrait.setTransportStatus(
        transportStatus: isOn ? .active : .inactive)
      if isOn {
        do {
          self.player = try self.createWebRtcPlayer()
        } catch {
          // Failed to initialize WebRtcPlayer
          self.uiState = .disconnected
          return
        }
        await self.player?.initialize()
        self.uiState = .live
      } else {
        self.player = nil
        self.uiState = .off
      }
    } catch {
      // Failed to toggle onOff
    }
  }
}

public func isDeviceRecording() -> Bool {
  guard let pushAvStreamTransportTrait else {
    // PushAvStreamTransportTrait not found.
    return false
  }
  guard
    let hasActiveConnection =
      pushAvStreamTransportTrait
      .attributes
      .currentConnections?
      .contains(where: { $0.transportStatus == .active })
  else {
    return false
  }
  return hasActiveConnection
}

// Turn the device's microphone on or off
func setMicrophone(on: Bool) async {
  do {
    _ = try await self.cameraAvStreamManagementTrait?.update {
      $0.setMicrophoneMuted(!on)
    }
  } catch {
    // Error
  }
}

// Turn audio recording on or off for the device
func setAudioRecording(on: Bool) async {
  do {
    _ = try await self.cameraAvStreamManagementTrait?.update {
      $0.setRecordingMicrophoneMuted(!on)
    }
  } catch {
    // Error
  }
}

// Adjust the camera speaker volume
func setSpeakerVolume(to value: UInt8) async {
  do {
    _ = try await cameraAvStreamManagementTrait.update {
      $0.setSpeakerVolumeLevel(value)
    }
  } catch {
    // Error
  }
}

// Change the camera's image orientation
// Value must be 0 or 180
func setImageRotation(to value: UInt16) async {
  do {
    _ = try await cameraAvStreamManagementTrait.update {
      $0.setImageRotation(value)
    }
  } catch {
    // Error
  }
}

// Turn night vision on or off
func setNightVision(
  to value: Google.CameraAvStreamManagementTrait.TriStateAutoEnum
) async {
  do {
    _ = try await cameraAvStreamManagementTrait.update {
      $0.setNightVision(value)
    }
  } catch {
    // Error
  }
}

// Set the LED brightness
func setStatusLightBrightness(
  to value: Google.CameraAvStreamManagementTrait.ThreeLevelAutoEnum
) async {
  do {
    _ = try await cameraAvStreamManagementTrait.update {
      $0.setStatusLightBrightness(value)
    }
  } catch {
    // Error
  }
}

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

func setCrop(x1: UInt16, y1: UInt16, x2: UInt16, y2: UInt16) {

  let viewport = Google.CameraAvStreamManagementTrait.ViewportStruct(
    x1: x1,
    y1: y1,
    x2: x2,
    y2: y2
  )

  Task {
    do {
      try await cameraAvStreamManagementTrait.update {
        $0.setViewport(viewport)
      }
    } catch {
      // Error
    }
  }

}

func getTransportOptions(
  transportOptions: Google.PushAvStreamTransportTrait.TransportOptionsStruct,
  wakeUpSensitivity: UInt8?,
  maxEventLength: UInt32?
) async throws
  -> Google.PushAvStreamTransportTrait.TransportOptionsStruct
{

  var newMotionTimeControl:
    Google.PushAvStreamTransportTrait.TransportMotionTriggerTimeControlStruct? = nil
  if let maxEventLength {
    guard let motionTimeControl = transportOptions.triggerOptions.motionTimeControl else {
      throw HomeError.failedPrecondition(
        // Error - cannot update max event length without motion time control
    }
    newMotionTimeControl =
      Google.PushAvStreamTransportTrait.TransportMotionTriggerTimeControlStruct(
        initialDuration: motionTimeControl.initialDuration,
        augmentationDuration: motionTimeControl.augmentationDuration,
        maxDuration: maxEventLength,
        blindDuration: motionTimeControl.blindDuration
      )
  }

  return Google.PushAvStreamTransportTrait.TransportOptionsStruct(
    streamUsage: .recording,
    videoStreamID: nil,
    audioStreamID: nil,
    tlsEndpointID: transportOptions.tlsEndpointID,
    url: transportOptions.url,
    triggerOptions: Google.PushAvStreamTransportTrait.TransportTriggerOptionsStruct(
      triggerType: .motion,
      motionZones: nil,
      motionSensitivity: wakeUpSensitivity,
      motionTimeControl: newMotionTimeControl,
      maxPreRollLen: nil
    ),
    ingestMethod: .cmafIngest,
    containerOptions: Google.PushAvStreamTransportTrait.ContainerOptionsStruct(
      containerType: .cmaf,
      cmafContainerOptions: nil
    ),
    expiryTime: nil
  )
}

private func getRecordingConnection() async throws
  -> Google.PushAvStreamTransportTrait.TransportConfigurationStruct?
{
  guard let pushAvStreamTransportTrait else {
    // Error - PushAvStreamTransport trait not available
    return nil
  }

  let connections = try await pushAvStreamTransportTrait.findTransport().transportConfigurations

  for connection in connections {
    guard let transportOptions = connection.transportOptions,
      transportOptions.streamUsage == .recording
    else {
      continue
    }

    return connection
  }

  return nil
}

func setWakeUpSensitivity(to value: UInt8) async {
  do {
    let connection = try await getRecordingConnection()
    guard let connection,
      let transportOptions = connection.transportOptions
    else {
      // Error - Transport options not available
      return
    }

    guard transportOptions.triggerOptions.motionSensitivity != nil else {
      // Error - Motion sensitivity not available to be updated for this device
      return
    }

    try await pushAvStreamTransportTrait.modifyPushTransport(
      connectionID: connection.connectionID,
      transportOptions: self.getTransportOptions(
        transportOptions: transportOptions,
        wakeUpSensitivity: value,
        maxEventLength: nil
      )
    )

  } catch {
    // Error
  }
}

func setMaxEventLength(to value: UInt32) async {
  do {
    let connection = try await getRecordingConnection()
    guard let connection,
      let transportOptions = connection.transportOptions
    else {
      // Error - Transport options not available
      return
    }

    guard transportOptions.triggerOptions.motionTimeControl != nil else {
      // Error - Motion time control not available to be updated for this device
      return
    }

    try await pushAvStreamTransportTrait.modifyPushTransport(
      connectionID: connection.connectionID,
      transportOptions: self.getTransportOptions(
        transportOptions: transportOptions,
        wakeUpSensitivity: nil,
        maxEventLength: value
      )
    )

  } catch {
    // Error
  }
}