| |
|
| Classification: |
C++ |
Category: |
Multimedia |
| Created: |
04/19/2004 |
Modified: |
05/17/2004 |
| Number: |
FAQ-1034 |
| Platform: |
Symbian OS v7.0s |
|
Question:
I have heard references to a DualTone API which allows me to play two user-defined tone frequencies but cannot find any documentation
for it. What is this API?
Answer:
The DualTone API was a late addition to Symbian OS v7.0s and will only be available in phones running v8.0 or later builds
of v7.0s (excluding the Nokia 6600). The API is defined in MdaAudioTonePlayer.h and is used in the same way as the other tone
APIs.
In order to prepare a tone of two user defined frequencies the following method is used:
IMPORT_C void PrepareToPlayDualTone(TInt aFrequencyOne, TInt aFrequencyTwo, const TTimeIntervalMicroSeconds& aDuration);
The two frequencies are supplied in Hertz and the required duration of the tone is supplied in micro seconds. Once the tone
has been prepared it can be played and stopped in the same manner as with the other tone types i.e. Play() and CancelPlay() etc.
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