onWTNDataMessageReceived property

FutureOr<void> Function(String streamId, Uint8List message, DataMessageSourceType sourceType)? onWTNDataMessageReceived

@detail callback @valid since 3.60. @author hanchenchen @brief The data information contained in the callback of WTN stream..
After calling subscribeWTNAudioStream{@link #IWTNStream#subscribeWTNAudioStream}/subscribeWTNVideoStream{@link #IWTNStream#subscribeWTNVideoStream}, you can listen to this callback and retrieve SEI messages inserted by Open API calls or audio volume. @param streamId ID of the WTN stream @param message The received data message's content is as follows:

• Data inserted by calling the OpenAPI.
• Media volume in JSON, before you can receive which you need to enable it via calling the OpenAPI. Refer to the definition below to parse the JSON string. {
  "Type" : "VolumeIndication", //Specific business type.
  "VolumeInfos" : [ // Business type corresponding information
  {
  "RoomId":"1000001", // Room ID
  "UserId":"1000001", // User ID
  "StreamType":0, // 0:camera stream；1:screen stream
  "LinearVolume":1 // LinearVolume
  }
  @param sourceType Message source. See DataMessageSourceType{@link #DataMessageSourceType}. @note You also need to listen to onWTNSEIMessageReceived{@link #IWTNStreamEventHandler#onWTNSEIMessageReceived} to receive SEI inserted via API by the client SDK. @order 6

Implementation

FutureOr<void> Function(
        String streamId, Uint8List message, DataMessageSourceType sourceType)?
    onWTNDataMessageReceived;