problem while recording in buffers in CmdaAudioInputStream and playing with CmdaAudio

[rajkumar278]

Hi all,

I am using the buffer array for recording through CmdaAudioInputStream. I Took the 50 buffers array. I have initialized counting to 0. Now During each read operation counting is incremented to 1. I am taking the buffer size of 11200 bytes. As calls are asynchronous, suddenly the counter reaches its maximum limit and recording is not fine...

Can any one suggest me the way....

[Rocco77]

You must issue the readL() in the maiscbuffercopied callbacks not in a loop.
So the async process is driven from the MMF timings and needs.
On every callback process/save the chunk of data (inside the descriptor) you get from the mic and issue a new readL().

Rocco

[rajkumar278]

see i am already doing like this. see the code:
void CHelloWorldBasicAppUi::MaiscOpenComplete(TInt aError)
{



pInStream->SetAudioPropertiesL(TMdaAudioDataSettings::ESampleRate8000Hz,TMdaAudioDataSettings::EChannelsMono);

// set stream properties, 16bit 8KHz mono

// set stream input gain to maximum
pInStream->SetGain(pInStream->MaxGain());
// set stream priority to normal and time sensitive
pInStream->SetPriority(EPriorityNormal, EMdaPriorityPreferenceTime);
pInStream->ReadL(*iStreamBuffer[m]);

}
void CHelloWorldBasicAppUi::MaiscBufferCopied(TInt aError, const TDesC8& aBuffer)
{

if (&aBuffer==iStreamBuffer[iStreamBuffer.Count()-1])
m=0;
else
m++; // issue ReadL() for next audio data block

if (aError==KErrNone)
{

pInStream->ReadL(*iStreamBuffer[m]);

}
else
{
TBuf16<100> st;
CAknInformationNote* informationNote1;
//_LIT(message,"There is error");
st.AppendNum(aError);
informationNote1 = new ( ELeave ) CAknInformationNote;
informationNote1->ExecuteLD(st);
}

}

But when i run this code...recording is fine ...
and when i press at play....count of m is 50 after 2 seconds....and it is not played well...

can you please see it where am i wrong?

[Rocco77]

do you use the same callback driven method for playing too?
I mean WriteL() in maoscbuffercopied.
You might have something wrong in the play part

Rocco

[rajkumar278]

In the play part see the code
void CHelloWorldBasicAppUi::PlayL()
{

TInt iFileSize;
TMdaAudioDataSettings iSettings;
pInStream->Stop();
pStream = CMdaAudioOutputStream::NewL(*this);

pStream->Open(&iSettings);


}

void CHelloWorldBasicAppUi::MaoscOpenComplete(TInt aError)
{

pStream->SetAudioPropertiesL(TMdaAudioDataSettings::ESampleRate8000Hz,TMdaAudioDataSettings::EChannelsMono);
pStream->SetVolume(pStream->MaxVolume());
pStream->WriteL(*iStreamBuffer[n]);



}

void CHelloWorldBasicAppUi::MaoscBufferCopied(TInt aError,const TDesC8& aBuffer)
{
if (&aBuffer==iStreamBuffer[iStreamBuffer.Count()-1])
{


}
else
{

// rotate stream if necessary
n++;
if (n==iStreamBuffer.Count()) n=0;
// issue WriteL() for next audio data block
pStream->WriteL(*iStreamBuffer[n]);
}

CAknInformationNote* informationNote2;
informationNote2 = new ( ELeave ) CAknInformationNote;
st.AppendNum(aError);
informationNote2->ExecuteLD(st);


}

Now please tell what is wrong?

[rajkumar278]

Yeah I am through....

[rajkumar278]

yeah i solved it.

[elhasab]

iam interested to know the solution
i dont know anything about symbian, and have a project to deliver
and what you are doing seems to be very usefull to me if you dont mind...
i have already submitted my problem in a thread called (problem in CMdaAudioRecorderUtility)
but no one gave me a hand till now ...
i'd be grateful if you could tell me what's wrong in my code
and 2nd i wanna know how to access my recorded file as an array

i would really really appreciate any help