Audio Capture and Streaming to a Server

[pmcerlean]

Hi,

I want to write a system for reporting on live sports events.

I want the reporters to be able to use an application on the mobile device to capture audio and have it transferred to a server (in realtime), where web listeners can access it. In effect I want to be able to let subscribers listen to the games live.

I have read about CMdaAudioInputStream so that seems like a good place to start.

How do I take the buffers from the audio recording and send them to a streaming server so that people can listen to them? I guess I should use RTSP for streaming them to a server.

The next question is how do I convert the PCM16 buffers to something like AMR? I guess I need to do this before firing them to the server?

I would be grateful if anyone can point me in the right direction as to the technologies I need to use to achieve my goals. Thanks.

Patrick.

[inguvaseshu]

For converting pcm to amr pls refer http://discussion.forum.nokia.com/fo...ad.php?t=79254

Regards,
Sheshu Kumar Inguva.

[santhu_island]

Hi,

the idea is good but insted of recording pcm16 and then converting to amr format and streaming to server you can directly record in amr format

TRAPD(lErrorCode, m_cAudioInputStreamPtr->SetDataTypeL(KMMFFourCCCodeAMR));

then the buffer you receive from hardware is amr format and you no need to convert again

Regards
Santhosh

[mobile_don]

Hi,

I want to write a system for reporting on live sports events.

I want the reporters to be able to use an application on the mobile device to capture audio and have it transferred to a server (in realtime), where web listeners can access it. In effect I want to be able to let subscribers listen to the games live.

I have read about CMdaAudioInputStream so that seems like a good place to start.

How do I take the buffers from the audio recording and send them to a streaming server so that people can listen to them? I guess I should use RTSP for streaming them to a server.

The next question is how do I convert the PCM16 buffers to something like AMR? I guess I need to do this before firing them to the server?

I would be grateful if anyone can point me in the right direction as to the technologies I need to use to achieve my goals. Thanks.

Patrick.

Hi
u can use this to convert PCM16 data into AMR
void xxxx::ConvertPcmToAmr()
{
iSrcBuf = CMMFDescriptorBuffer::NewL(somelength(e.g.320));
iDstBuf = CMMFDescriptorBuffer::NewL(somelength(e.g.32));

iSrcBuf->Data().Copy(iAudioData);

TCodecProcessResult result;
TRAPD(iErr, result = iCodec->ProcessL(*iSrcBuf, *iDstBuf));

iFile.Write(iDstBuf->Data());

}