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I want to allocate a memory buffer and initialize it with data of a mathematical equation in order to gain a pure DTMF tone. I am using the AudioQueueServices library to allocate and fill the buffer. I used a formula of 2 sine waves and 2 different frequencies. However, neither a sound nor a tone is not played.
It may be important to mention that the function of AudioPlayer: initWithData:error:
You haven’t really given enough information to diagnose your problem. The only obvious question to ask is whether you have setup your audio session?
A good sample to use as a reference is Dave Dribin’s A440 sample from iPadDevCamp Chicago. It shows how to play a simple 440 hz tone using both AudioQueueServices and Audio Unit graphs. Hopefully that will let you see where your issue is.