Get the gain of an audio stream.
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).
the SDL_AudioStream to query.
the gain of the stream or -1.0f on failure; call SDL_GetError() for more information.
Threadsafety: It is safe to call this function from any thread, as it holds a stream-specific mutex while running.
SDL_SetAudioStreamGain
See Implementation
Get the gain of an audio stream.
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).