[xine-devel] update of windows directx2 audio driver

[Matthias R. <mri...@in...>]

hi
  I've tried all audio driver on Windows XP in a Virtual Box on a  
MacBook Pro. In a first test, the PulseAudio driver worked fine. The  
older directx audio driver did only stutter. The newer directx2 driver  
did play, but had occasional audio gaps. After hunting this bug for a  
while, I decided to replace the slotted ring buffer with a simple (and  
easier to debug) version.

The current directx2 driver divides the windows ringbuffer into slots  
(3 as default) and checks for underruns at the border of each slot. I  
did not figure out exactly, why the gaps appeared, but the log output  
told me that the write pointer did overrun the read pointer which led  
to a wrong calculation of the audio delay. (e.g. shortly before 0.9 s  
and the next time a delay of 0.1 s). In the new version, data is  
simply added until the buffer is full, and every 200 ms it checks if  
at least 200 ms data are still in the audio buffer - if not, audio is  
stopped and everything is flushed to prevent windows from looping the  
ringbuffer.


The patch for the updated directx2 driver is longer than the actual  
file, so I just attach the updated file to this mail.

Has there been a good reason for the slotted ringbuffer checks? If  
not, I'd happy if my simpler version  (-60 lines... :) gets added to  
the repository. It does not show audio gaps so far in the same setup.

any comments?

cheers,
   matthias