This function is a legacy means of mixing audio.
void SDL_MixAudio(Uint8 * dst, const Uint8 * src, int volume); Uint32 len,
|dst||the destination for the mixed audio|
|src||the source audio buffer to be mixed|
|len||the length of the audio buffer in bytes|
|volume||ranges from 0 - 128, and should be set to SDL_MIX_MAXVOLUME for full audio volume|
This function is equivalent to calling...
SDL_MixAudioFormat(dst, src, format, len, volume);
format is the obtained format of the audio device from the legacy SDL_OpenAudio() function.
This function is available since SDL 2.0.0.