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(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)


A variable controlling how the fact chunk affects the loading of a WAVE file.

Header File

Defined in <SDL3/SDL_hints.h>




The fact chunk stores information about the number of samples of a WAVE file. The Standards Update from Microsoft notes that this value can be used to 'determine the length of the data in seconds'. This is especially useful for compressed formats (for which this is a mandatory chunk) if they produce multiple sample frames per block and truncating the block is not allowed. The fact chunk can exactly specify how many sample frames there should be in this case.

Unfortunately, most application seem to ignore the fact chunk and so SDL ignores it by default as well.

The variable can be set to the following values:

This hint should be set before calling SDL_LoadWAV() or SDL_LoadWAV_IO()


This hint is available since SDL 3.0.0.

CategoryAPI, CategoryAPIMacro, CategoryHints

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