Re: [AL] Sound lagging

[Lisa J. P. <li...@th...>]

On Sun, 20 Jul 2003, Peter Wang wrote:
> What about the _AL_SGIAL_PORTSIZE and _AL_SGIAL_BUFFERSIZE constants?

The problem with them is that the timer callback that calls the driver so
it can mix and output sound isn't called often enough for the sound
buffers to not underflow.

As such, I've just finished a bit of a nasty hack. The driver has been
modified so that if it detects it's running with pthreads (using the
threaded parameter to the callback), then it spawns off a new thread,
which blocks until more sound data is required, refills the buffer, and
then repeats.

This appears to radically improve the performance of Allegro on IRIX. If
someone could tell me a better way of detecting whether threading is in
use, I'll clean it up.

On another note, killing the window to my program doesn't seem to quit the
program. (The thread in the hacked driver is pthread_cancelled when the
driver is deinitialised.) I've tried to hook the window close call back,
but it doesn't help. Any advice?

-- 
Lisa - http://www.thecommune.org.uk/~lisa - http://www.lisastoys.co.uk/
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