(This function is part of SDL_mixer, a separate library from SDL.)

MIX_SetMixerFrequencyRatio

Set a mixer's master frequency ratio.

Header File

Syntax

bool MIX_SetMixerFrequencyRatio(MIX_Mixer *mixer, float ratio);

Function Parameters

MIX_Mixer *	mixer	the mixer to adjust.
float	ratio	the frequency ratio. Must be between 0.01f and 100.0f.

Return Value

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

Remarks

Each mixer has a master frequency ratio, that affects the entire mix. This can cause the final output to change speed and pitch. 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 is normal speed.

Each track also has a frequency ratio; it will be applied when mixing that track's audio regardless of the master setting. The master setting affects the final output after all mixing has been completed.

A mixer's master frequency ratio defaults to 1.0f.

This value can be changed at any time to adjust the future mix.

Thread Safety

It is safe to call this function from any thread.

Version

This function is available since SDL_mixer 3.0.0.