Playing a Fixed Tone Sequence

You have to configure DevSound in order to play a Fixed Tone Sequence.

The following settings can be configured before or during tone play:

• To return the number of available predefined tone sequences, use the CMMFDevSound::FixedSequenceCount() method:

           
            
           
           IMPORT_C TInt FixedSequenceCount();
          

  This is the number of fixed sequences supported by DevSound by default.

• To return the name assigned to a specific predefined tone sequence, use the CMMFDevSound::FixedSequenceName() method:

           
            
           
           IMPORT_C const TDesC &FixedSequenceName(TInt aSequenceNumber);
          

  This method has one parameter, aSequenceNumber , the index identifying the specific predefined tone sequence and returns a reference to a descriptor containing the fixed sequence name indexed by aSequenceNumber .

• To change the volume of the audio device to a specific value, use the CMMFDevSound::SetVolume() function. The volume can be set to any value from 0 to CMMFDevSound::MaxVolume() .

  To define a period over which the volume rises from 0 to the normal volume level, use the CMMFDevSound::SetVolumeRamp() function.

  Note: The CMMFDevSound::SetVolumeRamp() function is only available during tone play.

• To set the speaker balance, use the CMMFDevSound::SetPlayBalanceL() function. This function has two parameters:

  • aLeftPercentage - the left speaker volume percentage.

  • aRightPercentage - the right speaker volume percentage.

• To set the priority setting for this instance of DevSound to access the audio device, use the CMMFDevSound::SetPrioritySettings() method. Priority settings are used by the Audio Policy component to resolve multiple requests to access the audio hardware.