SDL_GetAudioDeviceGain - Man Page

#include <SDL3/SDL_audio.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.

SDL_SetAudioDeviceGain(3)

SDL_SetAudioDeviceGain(3).