"Accelerate" playback on the fly

[SmartFoxServer]

In our system we are playing back audio data from a queue filled continuously by a network stream.
Sometimes it can happen that the queue is filled faster than what it takes to process it, causing a lag in the audio playback.
Is there a way to "accelerate" the playback (process more data) on the fly (even at the cost of a shifted pitch in the audio output)?
We tried changing the sample rate value returned by the get_data_format function of our custom data source, but it has no effect.
Thank you.

[mackron]

ma_sound_set_pitch() should do what you're after. It'll result in the sound being a higher pitch, but it'll process data at a faster rate to allow it to catch up.