SDL_AudioStreamDataCompleteCallback.3type

#include <SDL3/SDL_audio.h>

typedef void (SDLCALL *SDL_AudioStreamDataCompleteCallback)(void *userdata, const void *buf, int buflen);

When using SDL_PutAudioStreamDataNoCopy() to provide data to an SDL_AudioStream, it's not safe to dispose of the data until the stream has completely consumed it. Often times it's difficult to know exactly when this has happened.

This callback fires once when the stream no longer needs the buffer, allowing the app to easily free or reuse it.

userdata

an opaque pointer provided by the app for their personal use.

buf

the pointer provided to SDL_PutAudioStreamDataNoCopy().

buflen

the size of buffer, in bytes, provided to SDL_PutAudioStreamDataNoCopy().

This callbacks may run from any thread, so if you need to protect shared data, you should use SDL_LockAudioStream to serialize access; this lock will be held before your callback is called, so your callback does not need to manage the lock explicitly.

This datatype is available since SDL 3.4.0.

SDL_SetAudioStreamGetCallback(3), SDL_SetAudioStreamPutCallback(3)