Function fermium::audio::SDL_MixAudio
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In-place mixes two audio sources.
This takes two audio buffers of the playing audio format and mixes
them, performing addition, volume adjustment, and overflow clipping.
The volume ranges from 0 - 128, and should be set to SDL_MIX_MAXVOLUME
for full audio volume. Note this does not change hardware volume.
This is provided for convenience, you can mix your own audio data.