SDL_AudioStream
An opaque structure that buffers, converts, resamples, and generally streams audio data.
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Remarks
The SDL_AudioStream structure is used to convert audio data between different formats in arbitrarily-sized blocks. It is meant to be a replacement for the SDL_AudioCVT-related interfaces.
A tutorial on using audio stream is at Tutorials/AudioStream.
(this page should be fleshed out more, too.)