CMdaAudioInputStream problem

[birch01]

Hello everyone,

I need to make a program that records data in a stream while I'm playing data from another stream. I'm using CMdaAudioOutputStream and CMdaAudioInputStream. Problem is, when I run the code on my phone, the file in which I record data is always empty. I don't get any kernel error or anything on screen. Program plays sound as it should, I can terminate it normally.

When I run the code on emulator I get the Audio Streaming Panic USER 29 on console a few moments after MaiscOpenComplete is executed. Could anyone tell me what could be wrong?

Here's what I do:

In AppUI.cpp

#if defined(__WINS__)
	_LIT(KFileName, "c:\\data\\sample_stream.wav");
	_LIT(KRecordedStream, "c:\\data\\recs.dat" );
#else
	_LIT(KFileName, "\\data\\sample_stream.wav");
	_LIT(KRecordedStream, "\\data\\recs.dat" );
#endif
...
iAudioPlayer->RecordL(iCoeEnv->FsSession(), KRecordedStream);
iAudioPlayer->PlayL(iCoeEnv->FsSession(), KFileName);

In method RecordL:

iFile.Close();
TRAPD(err, iFile.Replace(aFs, aFileName, EFileWrite));

if(err < 0)
	{
	User::Exit(err);
	}
	
iStreamSettings.iChannels=TMdaAudioDataSettings::EChannelsMono;
iStreamSettings.iSampleRate=TMdaAudioDataSettings::ESampleRate8000Hz;

// Open the input audio device for streaming.
TRAP(err, iInputStream->Open(&iStreamSettings));
if(err < 0)
	{
	User::Exit(err);
	}

In MaiscOpenComplete:

// Set the data type.
TRAP(err, iInputStream->SetDataTypeL(KMMFFourCCCodePCM16));
		
if (KErrNone == err)
	{
	// set stream input gain to maximum
	iInputStream->SetGain(iInputStream->MaxGain()); 
	// set stream priority to normal and time sensitive
	iInputStream->SetPriority(EPriorityNormal, EMdaPriorityPreferenceTime);

	// Create a buffer to be written to the file.				
	RBuf8 buffer;
	User::LeaveIfError(buffer.CreateMax(KMaxBuffer));
	CleanupClosePushL(buffer);
	buffer.Zero();	
	// Fill the buffer with your data.
	iInputStream->ReadL(buffer);
	// Write buffer to the file.
	User::LeaveIfError(iFile.Write(buffer, buffer.Length()));

	// Delete the buffer
	CleanupStack::PopAndDestroy(&buffer);
	}

In MaiscBufferCopied:

if (KErrNone == aError)
	{
	RBuf8 buffer;
	User::LeaveIfError(buffer.CreateMax(KMaxBuffer));
	CleanupClosePushL(buffer);
	buffer.Zero();
		
	iInputStream->ReadL(buffer);

	// Write buffer to the file.
	User::LeaveIfError(iFile.Write(buffer, buffer.Length()));

	// Delete the buffer
	CleanupStack::PopAndDestroy(&buffer);
	}

In MaiscRecordComplete:

iFile.Close();

Console output:

61.625	26020310:CMMFDevSoundAdaptation::CBody::SetPrioritySettings(const TMMFPrioritySettings &)>ENTR
    61.625	26020310:CMMFDevSoundAdaptation::CBody::SetPrioritySettings(const TMMFPrioritySettings &)>EXIT
    61.625	26020310:CMMFDevSoundAdaptation::CBody::MaxVolume()>ENTR
    61.625	26020310:CMMFDevSoundAdaptation::CBody::MaxVolume()>ENTR
    61.625	26020310:CMMFDevSoundAdaptation::CBody::SetDeviceVolume(int)>ENTR
    61.625	26020310:CMMFDevSoundAdaptation::CBody::SetDeviceVolume(int)>EXIT
    61.630	26020310:CMMFDevSoundAdaptation::CBody::PlayToneSequenceL(const TDesC8 &)>ENTR
    61.635	44720310:CMMFDevSoundAdaptation::CBody::SetClientConfig(const TMMFClientConfig &)>ENTR
    61.635	44720310:CMMFDevSoundAdaptation::CBody::InitializeL(MDevSoundAdaptationObserver &, TFourCC, TMMFState)>ENTR
    61.640	44720310:CMMFDevSoundAdaptation::CBody::InitializeL(MDevSoundAdaptationObserver &, TUid, TMMFState)>ENTR
    61.640	44720310:CMMFDevSoundAdaptation::CBody::InitializeFormat(TPckgBuf<RMdaDevSound::TSoundFormatsSupported> &, TPckgBuf<RMdaDevSound::TCurrentSoundFormat> &)>ENTR
    61.640	44720310:CMMFDevSoundAdaptation::CBody::InitializeFormat(TPckgBuf<RMdaDevSound::TSoundFormatsSupported> &, TPckgBuf<RMdaDevSound::TCurrentSoundFormat> &)>EXIT
    61.645	44720310:CMMFDevSoundAdaptation::CBody::InitializeHwDevice()>ENTR
    61.645	44720310:CMMFDevSoundAdaptation::CBody::InitializeHwDevice()>EXIT
    61.645	44720310:CMMFDevSoundAdaptation::CBody::InitializeL(MDevSoundAdaptationObserver &, TUid, TMMFState)>EXIT
    61.645	44720310:CMMFDevSoundAdaptation::CBody::InitializeL(MDevSoundAdaptationObserver &, TFourCC, TMMFState)>EXIT
    61.645	44720310:CMMFDevSoundAdaptation::CBody::Config() const>ENTR
    61.650	44720310:CMMFDevSoundAdaptation::CBody::SetConfigL(const TMMFCapabilities &)>ENTR
    61.650	44720310:CMMFDevSoundAdaptation::CBody::SetConfigL(const TMMFCapabilities &)>EXIT
    61.650	3e480310:CMMFDevSoundAdaptation::CBody::SetClientConfig(const TMMFClientConfig &)>ENTR
    61.650	3e480310:CMMFDevSoundAdaptation::CBody::InitializeL(MDevSoundAdaptationObserver &, TFourCC, TMMFState)>ENTR
    61.650	3e480310:CMMFDevSoundAdaptation::CBody::InitializeL(MDevSoundAdaptationObserver &, TUid, TMMFState)>ENTR
    61.655	3e480310:CMMFDevSoundAdaptation::CBody::InitializeL(MDevSoundAdaptationObserver &, TUid, TMMFState)>EXIT
    61.655	3e480310:CMMFDevSoundAdaptation::CBody::InitializeL(MDevSoundAdaptationObserver &, TFourCC, TMMFState)>EXIT
    61.670	44720310:CMMFDevSoundAdaptation::CBody::Config() const>ENTR
    61.675	44720310:CMMFDevSoundAdaptation::CBody::SetConfigL(const TMMFCapabilities &)>ENTR
    61.675	44720310:CMMFDevSoundAdaptation::CBody::SetConfigL(const TMMFCapabilities &)>EXIT
    61.675	44720310:CMMFDevSoundAdaptation::CBody::MaxGain()>ENTR
    61.675	44720310:CMMFDevSoundAdaptation::CBody::SetGain(int)>ENTR
    61.675	44720310:CMMFDevSoundAdaptation::CBody::SetDeviceRecordLevel(int)>ENTR
    61.675	44720310:CMMFDevSoundAdaptation::CBody::SetDeviceRecordLevel(int)>EXIT
    61.675	44720310:CMMFDevSoundAdaptation::CBody::SetGain(int)>EXIT
    61.675	44720310:CMMFDevSoundAdaptation::CBody::SetPrioritySettings(const TMMFPrioritySettings &)>ENTR
    61.680	44720310:CMMFDevSoundAdaptation::CBody::SetPrioritySettings(const TMMFPrioritySettings &)>EXIT
    61.690	44720310:CMMFDevSoundAdaptation::CBody::RecordInitL()>ENTR
    61.695	44720310:CMMFDevSoundAdaptation::CBody::RequestPolicy()>ENTR
    61.695	44720310:CMMFDevSoundAdaptation::CBody::RequestPolicy()>EXIT
    61.700	44720310:CMMFDevSoundAdaptation::CBody::RecordInitL()>EXIT
    61.700	44720310:CMMFDevSoundAdaptation::CBody::StartRecordDataL()>ENTR
    61.700	44720310:CMMFDevSoundAdaptation::CBody::SetRecordFormat(TPckgBuf<RMdaDevSound::TCurrentSoundFormat> &)>ENTR
    61.700	44720310:CMMFDevSoundAdaptation::CBody::SetRecordFormat(TPckgBuf<RMdaDevSound::TCurrentSoundFormat> &)>EXIT
    61.700	44720310:CMMFDevSoundAdaptation::CBody::SetDeviceRecordLevel(int)>ENTR
    61.700	44720310:CMMFDevSoundAdaptation::CBody::SetDeviceRecordLevel(int)>EXIT
    61.760	3e480310:CMMFDevSoundAdaptation::CBody::Config() const>ENTR
    61.765	3e480310:CMMFDevSoundAdaptation::CBody::SetConfigL(const TMMFCapabilities &)>ENTR
    61.765	3e480310:CMMFDevSoundAdaptation::CBody::SetConfigL(const TMMFCapabilities &)>EXIT
    61.765	3e480310:CMMFDevSoundAdaptation::CBody::MaxVolume()>ENTR
    61.765	3e480310:CMMFDevSoundAdaptation::CBody::MaxVolume()>ENTR
    61.770	3e480310:CMMFDevSoundAdaptation::CBody::SetDeviceVolume(int)>ENTR
    61.770	3e480310:CMMFDevSoundAdaptation::CBody::SetDeviceVolume(int)>EXIT
    61.770	3e480310:CMMFDevSoundAdaptation::CBody::PlayInitL()>ENTR
    61.770	3e480310:CMMFDevSoundAdaptation::CBody::RequestPolicy()>ENTR
    61.770	3e480310:CMMFDevSoundAdaptation::CBody::RequestPolicy()>EXIT
    61.775	3e480310:CMMFDevSoundAdaptation::CBody::PlayInitL()>EXIT
    61.775	3e480310:CMMFDevSoundAdaptation::CBody::SendEventToClient(const TMMFEvent &)>ENTR
    61.775	3e480310:CMMFDevSoundAdaptation::CBody::Error(int)>ENTR
    61.775	3e480310:CMMFDevSoundAdaptation::CBody::UpdateBytesPlayed()>ENTR
    61.775	3e480310:CMMFDevSoundAdaptation::CBody::UpdateBytesPlayed()>EXIT
    61.775	3e480310:CMMFDevSoundAdaptation::CBody::SamplesPlayed()>ENTR
    61.775	3e480310:CMMFDevSoundAdaptation::CBody::SamplesPlayed()>EXIT
    61.775	CMMFDevSoundSession[0x3e480238]::PlayError [-14]
    61.780	3e480310:CMMFDevSoundAdaptation::CBody::Error(int)>EXIT
    61.780	3e480310:CMMFDevSoundAdaptation::CBody::Stopped()>ENTR
    61.780	3e480310:CMMFDevSoundAdaptation::CBody::UpdateBytesPlayed()>ENTR
    61.780	3e480310:CMMFDevSoundAdaptation::CBody::UpdateBytesPlayed()>EXIT
    61.780	3e480310:CMMFDevSoundAdaptation::CBody::UpdatePolicyState()>ENTR
    61.780	3e480310:CMMFDevSoundAdaptation::CBody::UpdatePolicyState()>EXIT
    61.780	3e480310:CMMFDevSoundAdaptation::CBody::Stopped()>EXIT
    61.785	3e480310:CMMFDevSoundAdaptation::CBody::SendEventToClient(const TMMFEvent &)>EXIT
    62.105	44720310:CMMFDevSoundAdaptation::CBody::StartRecordDataL()>EXIT
    62.405	44720310:CMMFDevSoundAdaptation::CBody::EmptyThisHwBuffer(CMMFBuffer &)>ENTR
    62.405	CMMFDevSoundSession[0x44720238]::CreateChunk [0]
    62.405	CMMFDevSoundSession[0x44720238]::BufferToBeEmptied - Exit [0]
    62.405	44720310:CMMFDevSoundAdaptation::CBody::EmptyThisHwBuffer(CMMFBuffer &)>EXIT
    62.405	Thread Audio Streaming::Audio Streaming Panic USER 29

[wizard_hu_]

USER 29 is documented in the SDK Help.
Your concept about CMdaAudioInputStream::ReadL is wrong, it is also documented in the SDK Help.

Note that you can find working a audio stream example in Docs, Tools & Code above, Documentation, Symbian C++, Multimedia.