SDL_SetAudioStreamGain - Change the gain of an audio stream.

       This function is available since SDL 3.2.0.

       The  gain  of  a  stream  is  its  volume; a larger gain means a louder output, with a gain of zero being
       silence.

       Audio streams default to a gain of 1.0f (no change in output).

       This is applied during SDL_GetAudioStreamData ,  and  can  be  continuously  changed  to  create  various
       effects.

stream the stream on which the gain is being changed.

       gain   the gain. 1.0f is no change, 0.0f is silence.

       Defined in SDL3/SDL_audio.h

       SDL_SetAudioStreamGain - Change the gain of an audio stream.

       Returns true on success or false on failure; call

       SDL_GetError () for more information.

•(3), SDL_GetAudioStreamGain(3)

Simple Directmedia Layer                           SDL 3.2.10                          SDL_SetAudioStreamGain(3)

#include"SDL3/SDL.h"boolSDL_SetAudioStreamGain(SDL_AudioStream*stream,floatgain);

       It is safe to call this function from any thread, as it holds a stream-specific mutex while running.