Need Help: producing with continuous Noise

[max_gudluck]

Hi! I'm playing an audio file. I'm having problem because the file play continuously with a Noise even if all the data is already played (i see it during debug. the file is already decoded and played but it still producing noise even i click the stop button)

How can I stop that noise it producing?

[symbianyucca]

Firstly, you should propably ask the question under the technology you are using for development, and secondly, you propably could show a piece of code you are having problems with..

[max_gudluck]

i'm using carbide c++ and sdk s60 3rd edition feature pack 2...

here is the code:

void CRFsEngine::MaoscBufferCopied(TInt aError, const TDesC8& /*aBuffer*/)
{
TBool finish = EFalse;

if (aError==KErrNone)
{
TBool isEnd = EFalse;

for(TInt i = 0; ETrue; i++)
{
iAlgo = iReader->Read(8);

if(104 == iAlgo)
{
// decode
}
else if(100 == iAlgo)
{
// decode
}
else if(97 == iAlgo)
{
// decode
}
else
{
finish = ETrue;
break;
}

if(iOutputDecompression->Count() >= 80)
{
do
{
Transform();

}while(iOutputDecompression->Count() >= 80);
}

if(isEnd)
{
break;
}
}

if(finish)
{
return;
}

if(iBufStatus && !finish)
{
iStream->WriteL(rBufMdct1);
}
else
{
iStream->WriteL(rBufMdct1);
}
}
}

Can somebody help me?

[symbianyucca]

Hard to see from that piece of code, but have you checked if you still continue writing something into the stream. The "noise" should propably not just happen, it is likely to be something wrong with your logic..

[max_gudluck]

how can i check if it still continue writing something into the stream?

[symbianyucca]

You could try debugging it, put some breakpoints and see how it goes, or write to a begig file..

[Paul.Todd]

Or it could be this
http://wiki.forum.nokia.com/index.ph...filled_buffers

[max_gudluck]

i tried to do what is on this link: 'http://wiki.forum.nokia.com/index.ph...filled_buffers' but it still doesn't work...

it still producing noise...

when i try to debug it and put some breakpoint in the code...

it still producing noise...

i really need to fix this one....

[max_gudluck]

i tried to do what is on this link: 'http://wiki.forum.nokia.com/index.ph...filled_buffers' but it still doesn't work...

it still producing noise...

when i try to debug it and put some breakpoint in the code...

it still producing noise...

i really need to fix this one....

Here is the code i'm using:

void CRFsEngine::MaoscBufferCopied(TInt aError, const TDesC8& /*aBuffer*/)
{
	TBool finish = EFalse;
	TInt error;
		
	if (aError==KErrNone)
	{   
		TBool isEnd = EFalse;
			
	        for(TInt i = 0; ETrue; i++)
		{
			iAlgo = iReader->Read(8);
				
			if(104 == iAlgo)
			{
				TUint numDec = iReader->Read(32);
				iHuffman->createStats();
				iHuffman->Decode(numDec);
			}
			else if(100 == iAlgo)
			{
				iDifferential->DecodeDifferential();
			}
			else if(97 == iAlgo)
			{
				iArithmetic->InitializedValues();
			}
			else if(110 == iAlgo)
			{
				iNoCompression->DecompressNoCompression();
			}
			else 
			{
				finish = ETrue;
				break;
			}
				
			if(iOutputDecompression->Count() >= 80)
			{
				do
				{	
					Transform();
					
					iOutputDecompression->Delete(0, 40);
					iOutputDecompression->Compress();
							
					if(iCtrRBuf == 8000)
					{
						isEnd = ETrue;
						iCtrRBuf = 0;
							
						if(iBufStatus)
						{
							iBufStatus = EFalse;
						}
						else
						{
							iBufStatus = ETrue;
						}
					}
				}while(iOutputDecompression->Count() >= 80);
			}
				
			if(isEnd)
			{
				break;
			}
		}
		    
		if(!finish)
		{
		    	if(iBufStatus)
		   	{
		    		TRAPD(error, iStream->WriteL(rBufMdct1));  
		    	}
		    	else
		    	{
		    		TRAPD(error, iStream->WriteL(rBufMdct2));  
		    	}
		    }
		}
		
		if(finish)
                {
                return;
                }
	}
}

void CRFsEngine::PlayL()
{
    	rBufMdct1.Close();
   	rBufMdct2.Close();
        
   	LoadFileL();
    
	iStream->SetVolume(iVolStep * KInitialVolume); 
				
	iOutputDecompression->Reset();
	    
	iReader->SetTotalSizeExist(EFalse);
	    
	TBool isEnd = EFalse;
	    
    	for(TInt i = 0; ETrue; i++)
	{
		iAlgo = iReader->Read(8);
			
		if(104 == iAlgo)
		{
			TUint numDec = iReader->Read(32);
			iHuffman->createStats();
			iHuffman->Decode(numDec);
		}
		else if(100 == iAlgo)
		{
			iDifferential->DecodeDifferential();
		}
		else if(97 == iAlgo)
		{
			iArithmetic->InitializedValues();
		}
		else if(110 == iAlgo)
		{
			iNoCompression->DecompressNoCompression();
		}
		else 
		{
			break;
		}
				
		if(iOutputDecompression->Count() >= 80)
		{
			do
			{	
				Transform();
				iOutputDecompression->Delete(0, 40);
				iOutputDecompression->Compress();
										
				if(iCtrRBuf == 8000)
				{
					isEnd = ETrue;
					iCtrRBuf = 0;
					iBufStatus = ETrue;
			    }
			}while(iOutputDecompression->Count() >= 80);
		}
		
		if(isEnd)
		{
			break;
		}
	}
    	
	if(iStatus == EEngineReady)
	{
	   	iStatus = EEnginePlaying;
	   	iStream->WriteL(rBufMdct1);        
	}
}

void CRFsEngine::Transform()
{
	TInt iSize = 80;
	TReal64 temp = 0.0;
	TReal64 value = 0.0;
	TUint32 final = 0;
	TInt error;
			
	for(TUint i = 0; i < iSize; i++, temp = 0.0)
	{
		for(TUint j = 0; j < (iSize/2); j++)
		{
			final = iOutputDecompression->At(j);
			value = (((2*PI)/iSize) * (i + d) * (j + .5));
			error = Math::Cos(value, value);
			User::LeaveIfError(error);
			temp += iOutputDecompression->At(j) * value;
		}
			
		temp = (temp * 4.0) / (TReal64) (iSize);
		final = temp;
		
		// Here is the part where i replace the value in the buffer.
		if(iBufStatus)
		{
			rBufMdct2[iCtrRBuf] = final;
		}
		else
		{
			rBufMdct1[iCtrRBuf] = final;
		}
				
		iCtrRBuf++;
	}
}