# trtc_cloud_def library Null safety

## Classes

AudioMusicParam
  Parameters of music and voice settings APIs
CustomLocalRender
  Parameters of local video rendering with external texture
CustomRemoteRender
  Parameters of remote video rendering with external texture
CustomRender
  Parameters of remote video rendering with external texture
TRTCAudioRecordingParams
  Audio recording parameters
TRTCCloudDef
  Key class definition variable
TRTCLocalRecordingParams
  Recording parameters
TRTCMixUser
  Position information of each channel of subimage in On-Cloud MixTranscoding
TRTCNetworkQosParam
  Network bandwidth limit parameters
TRTCParams
  Room entry parameters
TRTCPublishCDNParam
  CDN relaying parameters
TRTCRenderParams
  Remote image parameters
TRTCSwitchRoomConfig
  Room switch parameters
TRTCTranscodingConfig
  On-Cloud MixTranscoding configuration
TRTCVideoEncParam
  Encoding parameters
TXVoiceChangerType
  Voice changing type definition (young girl, middle-aged man, heavy metal, punk...)
TXVoiceReverbType
  Reverb effect type definition (karaoke room, small room, big hall, deep, resonant...)