NAME¶

SDL_SetAudioStreamFrequencyRatio - Change the frequency ratio of an audio stream.

SYNOPSIS¶

#include <SDL3/SDL_audio.h>

bool SDL_SetAudioStreamFrequencyRatio(SDL_AudioStream *stream, float ratio);

DESCRIPTION¶

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 1.0f will play the audio faster, and at a higher pitch. A value less than 1.0f will play the audio slower, and at a lower pitch. 1.0f means play at normal speed.

This is applied during SDL_GetAudioStreamData, and can be continuously changed to create various effects.

FUNCTION PARAMETERS¶

stream

the stream on which the frequency ratio is being changed.

ratio

the frequency ratio. 1.0 is normal speed. Must be between 0.01 and 100.

RETURN VALUE¶

Returns true on success or false on failure; call SDL_GetError() for more information.

THREAD SAFETY¶

It is safe to call this function from any thread, as it holds a stream-specific mutex while running.

AVAILABILITY¶

This function is available since SDL 3.2.0.

SEE ALSO¶

SDL_GetAudioStreamFrequencyRatio(3), SDL_SetAudioStreamFormat(3)