Change the frequency ratio of an audio stream.
int SDL_SetAudioStreamFrequencyRatio(SDL_AudioStream *stream, float ratio);
|stream||The stream the frequency ratio is being changed|
|ratio||The frequency ratio. 1.0 is normal speed. Must be between 0.01 and 100.|
Returns 0 on success, or -1 on error.
The frequency ratio is used to adjust the rate at which input data is consumed. Changing this effectively modifies the speed and pitch of the audio. A value greater than 1.0 will play the audio faster, and at a higher pitch. A value less than 1.0 will play the audio slower, and at a lower pitch.
This is applied during SDL_GetAudioStreamData, and can be continuously changed to create various effects.
It is safe to call this function from any thread, as it holds a stream-specific mutex while running.
This function is available since SDL 3.0.0.