enable_audio_out interface
- Definition：
Int _stdcall enable_audio_out(void* client, int enabled);
- Parameter：
client:[in]，The client object which is form new_client.
enabled:[in]，Whether output audio on client terminal? 1:YES, 0:NO.
- Return：
Return ERROR_OK if success，else refer to the definition of error number
- Explain：
Start or stop output the audio of camera on client terminal, one client terminal can paly only one audio of camera at the same time. Make sure the camera has be connected before calling this interface.