Function sdl2_sys::SDL_MixAudioFormat

pub unsafe extern "C" fn SDL_MixAudioFormat(
    dst: *mut Uint8,
    src: *const Uint8,
    format: SDL_AudioFormat,
    len: Uint32,
    volume: c_int
)

Mix audio data in a specified format.

This takes an audio buffer src of len bytes of format data and mixes it into dst, performing addition, volume adjustment, and overflow clipping. The buffer pointed to by dst must also be len bytes of format data.

This is provided for convenience – you can mix your own audio data.

Do not use this function for mixing together more than two streams of sample data. The output from repeated application of this function may be distorted by clipping, because there is no accumulator with greater range than the input (not to mention this being an inefficient way of doing it).

It is a common misconception that this function is required to write audio data to an output stream in an audio callback. While you can do that, SDL_MixAudioFormat() is really only needed when you’re mixing a single audio stream with a volume adjustment.

\param dst the destination for the mixed audio \param src the source audio buffer to be mixed \param format the SDL_AudioFormat structure representing the desired audio format \param len the length of the audio buffer in bytes \param volume ranges from 0 - 128, and should be set to SDL_MIX_MAXVOLUME for full audio volume

\since This function is available since SDL 2.0.0.