This tutorial describes about how to play a DTMF(Dual and Multi-Frequency) Tone.
You have to configure DevSound in order to play a DTMF tone.
The following settings can be configured before or during DTMF tone play:
To set the duration of tone on, tone off and tone pause to be used during the DTMF tone playback, use the CMMFDevSound::SetDTMFLengths() method.
IMPORT_C void SetDTMFLengths(TTimeIntervalMicroSeconds32 &aToneOnLength, TTimeIntervalMicroSeconds32 &aToneOffLength, TTimeIntervalMicroSeconds32 &aPauseLength);
This method has three parameters:
&aToneOnLength - the period over which the tone is to be played.
&aToneOffLength - the period over which no tone is to be played.
&aPauseLength - the period over which tone playing is to be paused.
The internal configuration set by CMMFDevSound::SetDTMFLengths() lasts until it is recalled or for the lifetime of the current DevSound.
Note: The CMMFDevSound::SetDTMFLengths() function is only available during tone play.
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:
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.
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