SDL_GetAudioDeviceGain - Get the gain of an audio device.

       This function is available since SDL 3.2.0.

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

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

       Physical devices may not have their gain changed, only logical devices, and  this  function  will  always
       return -1.0f when used on physical devices.

devid  the audio device to query.

       Defined in SDL3/SDL_audio.h

       SDL_GetAudioDeviceGain - Get the gain of an audio device.

       Returns the gain of the device or -1.0f on failure; call

       SDL_GetError () for more information.

•(3), SDL_SetAudioDeviceGain(3)

Simple Directmedia Layer                           SDL 3.2.10                          SDL_GetAudioDeviceGain(3)

#include"SDL3/SDL.h"floatSDL_GetAudioDeviceGain(SDL_AudioDeviceIDdevid);

       It is safe to call this function from any thread.