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void Mix_SetPostMix(void (*mix_func)(void *udata, Uint8 *stream, int len), void *arg)
udataparameter. It is a good place to keep the state data for the processor, especially if the processor is made to handle multiple channels at the same time.
Hook a processor function mix_func to the postmix stream for post processing effects. You may just be reading the data and displaying it, or you may be altering the stream to add an echo. Most processors also have state data that they allocate as they are in use, this would be stored in the arg pointer data space.
This processor is never really finished, until the audio device is closed, or you pass NULL as the mix_func.
There can only be one postmix function used at a time through this method. Use
Mix_RegisterEffect(MIX_CHANNEL_POST, mix_func, NULL, arg) to use multiple postmix processors.
This postmix processor is run AFTER all the registered postmixers set up by