Hi,
Generally this is a result of the cpu not updating the buffers in
time, probably the cpu load is too high and the sound update does not
run often enough (i have a sound updates in a secondary thread which
updates at 25 per sec / iPhone, and while cpu is capable of doing the
mixing the flash is not fast enough to read enough data on time - while
streaming vorbis audio). Running the sound thread as realtime was
unnecessary.
Also, please note that Audigy SE is not a true Audigy, as it lacks
hardware mixing (though not sure it is the lack of hardware accelerated
3d audio or hw acceleration in general) which might make the issue more
audible. You can verify this when you query the the number of processed
buffers, if it is larger than one, you definitely need to increase the
frequency of updates (and guarantee that they happen).
Thats my 5 cents,
Tom K.
Thilo Schulz wrote:
> Hello,
>
> I have a user who uses the "Sound Blaster Audigy SE".. when he uses one of the
> two upper native devices:
>
> Lautsprecher (SB Audigy)
> Digitale Audioschnittstelle (SB Audigy)
> Generic Software
>
> the background music playing in the game stutters. Generic Software plays
> fine.
>
> There are 4 buffers which are queued, unqueued, refilled with data and
> requeued, and always chunks of 4096bytes of 44khz sampled 16 bit pcm stereo
> data are fed to each buffer. The buffers should be refilled right on time,
> there is always enough data available, there is only one or two buffers
> consumed after each frame so all should be fine. Still, the sound stutters.
> It seems to me as though the hardware OpenAL device would not be able to
> correctly switch in time to the next queued buffer if each buffer is only
> 4096 bytes large (meaning 1024 samples). Doubling the buffer size to 8192
> gets rid of the problem.
>
> Now I am left wondering: why does it work on Generic Software but not
> Hardware? What would be a good buffer size to use to make sure that it works
> on all hardware?
>
>
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