Playing AMR file or descriptor. (Playing is possible only in Emulator)

//I have implemented the AMR playing functionalities in CAudioPlayerEngine class
//Declaration of required constants
//I hardcoded the amr file, you could use some file browser or you can get amr data from the descriptor array.
_LIT(KAmrFile,         "\\system\\apps\\AudioPlayer\\test.amr");

//Cosntants needed for playing the amr file/descriptor
const TUid KMMFExControllerUID = {0x101F5022};
const TUid KMMFExDesFormatUID = {0x101FAF66};
const TUint32 KMMFFourCCCodeAMR = {0x524d4120};

void CAudioPlayerEngine::ConstructL()
{
        //Declare "CMdaAudioRecorderUtility* iAmrPlayer" in the header file
   iAmrPlayer = CMdaAudioRecorderUtility::NewL(*this,NULL,EMdaPriorityNormal,EMdaPriorityPreferenceTimeAndQuality);
}

void CAudioPlayerEngine::PlayAmrL()
    {
   /*
   This method shows how amr file can be played from the descriptor. AMR file is
   first read from the file to iStreamBuffer which is a TPtr8 to the descriptor data.
   Then OpenDesL method is used to play the file.
   */
    RFs fs;
    CleanupClosePushL(fs);            // PUSH
    User::LeaveIfError(fs.Connect());
    RFile file;
    CleanupClosePushL(file);         // PUSH
    TFileName streamFile(KAmrFile);
    User::LeaveIfError(CompleteWithAppPath(streamFile));
    User::LeaveIfError(file.Open(fs, streamFile, EFileRead | EFileShareReadersOnly));
    TInt fileSize = 0;
    file.Size(fileSize);
    //Declare in header file "TUint8* iSteamData"
    iStreamData = new (ELeave) TUint8[fileSize];
    //Declare in header file "TPtr8* iStreamBuffer"
    iStreamBuffer = new (ELeave) TPtr8(iStreamData, fileSize, fileSize);
    file.Read(*iStreamBuffer);

    //OpenDesL method opens the amr stored in the descriptor buffer, as soon as the opening completes,     
   //MoscoStateChangeEvent(..)  callback method is called
    iAmrPlayer->OpenDesL(*iStreamBuffer,KMMFExControllerUID,KMMFExControllerUID,
                        KMMFExDesFormatUID,KMMFFourCCCodeAMR);
    CleanupStack::PopAndDestroy(2);

   /*
   This is another method for playing amr file. amr file is directly played from the
   file itself. In both cases CMdaAudioRecorderUtility class is used.
   */
   
         /*
   TFileName amrFile(KAmrFile);
   User::LeaveIfError(CompleteWithAppPath(amrFile));
   iAmrPlayer->OpenFileL(amrFile,KMMFExControllerUID,KMMFExControllerUID,
                        KMMFExDesFormatUID,KMMFFourCCCodeAMR);
    */
   }

void CAudioPlayerEngine::MoscoStateChangeEvent(CBase* aObject, TInt aPreviousState, TInt aCurrentState, TInt aErrorCode)
{
   //Checking the curren state. Current state has to be EOpen and aErrorCode has to be KErrNone.
   if((aErrorCode == KErrNone) && (aCurrentState == iAmrPlayer->EOpen))
   {
      iState = EPlaying;
      iAmrPlayer->PlayL();
   }
}

//Above solution is working only with emulator. I don't kknow why. I am trying to play amr in the Nokia7610 device. It could not
//play the file. I am using Symbian OS 7.0 and SDK 2.0. Only emulator can play it.

I really appreciate any help regarding this.