Obtaining Audio Data Streams

API Description

This API is used to obtain the audio data streams after audio mixing of each venue in a meeting.

Precautions

This API is an asynchronous API. The return value of the callback function only indicates whether the API is successfully called. The actual service processing result is returned in the corresponding notification function.

This API can be called before joining a meeting. After a meeting is created or joined, a notification is sent.

Method Definition

HWM_SDK_AGENT_API hwmsdk::HwmErrCode SetAudioRawDataOutputConfig(bool isOpen);

Callback Function

virtual void OnSetAudioRawDataOutputConfigResult(hwmsdk::HwmErrCode ret, const char* reason) {};

Notification Function

virtual void OnAudioFrameNotify(const AudioFrameData* pFrame) {};

Parameter Description

**Table 1** Parameter description
Parameter	Mandatory	Type	Description
isOpen	Yes	bool	Whether to enable the function.

**Table 2** Return values
Type	Description
HwmErrCode	If 0 is returned, the operation is successful. If other values are returned, the operation fails. For details about values returned upon failures, see Common Error Codes.

**Table 3** **AudioFrameData parameters**
Parameter	Type	Description
eFrameType	AudioFrameType	Audio frame type.
iSamples	signed int	Number of sampling points for each channel.
iSamplesPerSec	signed int	Sampling ratio.
iBytesPerSample	signed int	Number of bytes of each sampling point. Generally, the PCM audio is two bytes.
iChannels	signed int	Number of audio channels.
pBuffer	char *	Data buffer. Length = iSamples x iBytesPerSample x iChannels
uiDataLen	signed int	Data length, which is used after encoding or before decoding. The value of this parameter needs to be updated after encryption or decryption.
uiBufferLen	signed int	Buffer length. The encoded data is encrypted by a third party. The data length increases to prevent overflow.

**Table 4** Enumerated values of AudioFrameType
Enumerated Value	Description
AUDIO_FRAME_TYPE_PCM16	16-bit precision PCM

Sample Code

   
    
      
      
        /**
* The notification of reporting audio stream frame data
*/
void demoNotifyProc::OnAudioFrameNotify(const AudioFrameData* pFrame)
{
    if(nullptr != pFrame)
    {
        FILE* recordFile = nullptr;
        std::string Path ("D:\\AudioFrame.pcm");
        auto error = fopen_s(&recordFile,Path.c_str(), "ab+");
        if (error != 0)
        {
            CTools::OutputRetStr("open file error = " + std::to_string(error));
        }

        if (nullptr != recordFile)
        {
            fwrite(pFrame->pBuffer, sizeof(char), pFrame->iSamples * pFrame->iBytesPerSample * pFrame->iChannels, recordFile);
            fclose(recordFile);
        }
    }
}

       

     

   
  