Man page - sdl_getaudiodevicegain(3)

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SDL_GetAudioDeviceGain - Get the gain of an audio device.

Defined in SDL3/SDL_audio.h

#include "SDL3/SDL.h"

float SDL_GetAudioDeviceGain(SDL_AudioDeviceID devid);

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.

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

SDL_GetError () for more information.

It is safe to call this function from any thread.

This function is available since SDL 3.2.0.