CMdaAudioOutputStream play mp3 slowly

[kuddy_abc]

i am using following code to stream mp3 audio. but it plays music slowly? what is work. please help me

header
---------

#ifndef AUDIOSTREAMPLAYER_H
#define AUDIOSTREAMPLAYER_H

// INCLUDE FILES
#include <e32std.h>
#include <e32base.h>
#include <MdaAudioOutputStream.h>

// FORWARD DECLARATION
class RFs;

// CLASS DECLARATION

class CAudioStreamPlayer : public CBase, public MMdaAudioOutputStreamCallback
	{
public: // Constructors and destructor
	static CAudioStreamPlayer* NewL();
	static CAudioStreamPlayer* NewLC();	
	~CAudioStreamPlayer();

public: // Public methods
	void PlayL(RFs& aFs, const TDesC& aFileName);
	void Stop();
	
private: // Constructors
	CAudioStreamPlayer();
	void ConstructL();

private: // From MMdaAudioOutputStreamCallback
	void MaoscOpenComplete(TInt aError);
	void MaoscBufferCopied(TInt aError, const TDesC8& aBuffer);
	void MaoscPlayComplete(TInt aError);
	
private: // Private methods
	void DisplayErrorMessage(TInt aError);

private:
	CMdaAudioOutputStream* iAudioStream;
	RFile iFile;
	RBuf8 iBuffer;
	};

#endif // AUDIOSTREAMPLAYER_H

source
---------

/ INCLUDE FILES
#include <eikenv.h>
#include <mda/common/audio.h>
#include "AudioStreamPlayer.h"

// CONSTANTS
const TInt KMaxBuffer = 8192; // 8 KB buffer
const TInt KVolumeDenominator = 2;

// METHODS DEFINITION

CAudioStreamPlayer::CAudioStreamPlayer()
	{
	}

CAudioStreamPlayer::~CAudioStreamPlayer()
	{
	delete iAudioStream;
	iFile.Close();
	iBuffer.Close();
	}

CAudioStreamPlayer* CAudioStreamPlayer::NewLC()
	{
	CAudioStreamPlayer* self = new (ELeave)CAudioStreamPlayer();
	CleanupStack::PushL(self);
	self->ConstructL();
	return self;
	}

CAudioStreamPlayer* CAudioStreamPlayer::NewL()
	{
	CAudioStreamPlayer* self=CAudioStreamPlayer::NewLC();
	CleanupStack::Pop(self);
	return self;
	}

void CAudioStreamPlayer::ConstructL()
	{
	iBuffer.CreateL(KMaxBuffer);
	iAudioStream = CMdaAudioOutputStream::NewL(*this);
	}

void CAudioStreamPlayer::PlayL(RFs& aFs, const TDesC& aFileName)
	{
	Stop();
	
	// Open the file for reading.
	iFile.Close();
	User::LeaveIfError(iFile.Open(aFs, aFileName, EFileRead));
	
	// Open the audio device for streaming.
	iAudioStream->Open(NULL);
	}

void CAudioStreamPlayer::Stop()
	{
	iAudioStream->Stop();
	}

void CAudioStreamPlayer::MaoscOpenComplete(TInt aError)
	{
	if (KErrNone == aError)
		{
		// Read the buffer.
		iFile.Read(iBuffer, KMaxBuffer);
		
		// Set the data type.
		TInt err = KErrNone;
		TRAP(err, iAudioStream->SetDataTypeL(KMMFFourCCCodeMP3));
		
		if (KErrNone == err)
			{
			// Set the sampling rate and number of channels.
			TRAP(err, iAudioStream->SetAudioPropertiesL(
					TMdaAudioDataSettings::ESampleRate44100Hz,
					TMdaAudioDataSettings::EChannelsMono));
	
			if (KErrNone == err)
				{
				// Set volume and play it.
				iAudioStream->SetVolume(
						iAudioStream->MaxVolume() / KVolumeDenominator);
				TRAP(err, iAudioStream->WriteL(iBuffer));
				}
			}
		
		if (KErrNone != err)
			{
			DisplayErrorMessage(err);
			}
		}
	else
		{
		// Do something when error happens.
		DisplayErrorMessage(aError);
		}
	}

void CAudioStreamPlayer::MaoscBufferCopied(TInt aError,
		const TDesC8& /*aBuffer*/)
	{
	if (KErrNone == aError)
		{
		// Read the next buffer.
		iFile.Read(iBuffer, KMaxBuffer);
		TRAPD(err, iAudioStream->WriteL(iBuffer));
		
		if (KErrNone != err)
			{
			DisplayErrorMessage(err);
			}
		}
	else
		{
		// Do something when error happens.	
		}
	}

void CAudioStreamPlayer::MaoscPlayComplete(TInt /*aError*/)
	{
	iFile.Close();
	}

void CAudioStreamPlayer::DisplayErrorMessage(TInt aError)
	{
	const TInt KMaxBuffer = 15;
	_LIT(KErrorMessage, "Error: %d");
	TBuf<KMaxBuffer> buffer;
	buffer.AppendFormat(KErrorMessage, aError);
	TRAP_IGNORE(CEikonEnv::Static()->InfoWinL(buffer, buffer));
	}

// End of File

AppUI
----------

.
_LIT(KFileName, "\\data\\song.mp3");
.
.
.
case EAudioStreamingPlay:
			{
			// Construct file name.
			// It adds drive letter to KFileName, where drive letter
			// is the same as the application's executable.
			TParsePtrC parseAppPath(Application()->AppFullName());
			TParse parseFileName;
			parseFileName.Set(parseAppPath.Drive(), 0, &KFileName);
			
			// Play the audio clip.
			iAudioPlayer->PlayL(iCoeEnv->FsSession(),
					parseFileName.FullName());
			break;
			}
.
.
.

[archerabi]

try

TRAP(err, iAudioStream->SetAudioPropertiesL(
					TMdaAudioDataSettings::ESampleRate44100Hz,
					TMdaAudioDataSettings::EChannelsStereo));