[SDL] Audio callback function is not called in time sometimes

[Mine]

Hi All,
    I'm developing a media player using SDL, and now I met the problem that
the audio callback function is sometimes not called in time, and cause the
audio a little fitful.
    I did some investigation about this problem. I use such piece of code to
open the audio device:
        wanted_spec.xxx = xxx;
        wanted_spec.callback = audio_callback;    //audio_callback is my
audio callback function
        SDL_OpenAudio(&wanted_spec, &spec);
    I put some log in audio_callback function, and find that when the
phenomenon occurs the audio_callback function is not called in time, which
cause a split of the audio. And continuously not in time called
audio_callback causes the fitful sound.

    My OS is Windows XP, and generally this phenomenon occurs when there're
task switches, like focus on other windows, minimum/maximum a window or
something like that. And if there's no such task switch, the sound is
smooth.
    Do you know anything about that?
-- 
Mine
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