Vorbis dev - Sep 2002 - Skipping with vorbisfile playback using DirectSound

I'm having a problem trying to write a simple vorbis file player using
DirectSound. The decoding portion is pretty much straight from the
vorbisfile sample code.  The pcm data gets put into one half of a
DirectSound buffer, and as that half is playing, the next half gets filled.
The problem is, there's skipping and some noise when the file is being
played (although some of the music is audible). Could this this caused by
the time spent decoding? Wav files work fine so I'm fairly certain it's
not
the playback code itself. I've tried decoding various amounts at one time
but in each case the same thing occurs (although to different degrees).  Is
there something I can do to fix this without adding a separate decoding
thread (or is that going to be necessary)? Or could it be something else?

Thanks,
  Borut

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When I first tried implementing something like this I had a similar
problem (some sound cards it would happen with more than others).  In any
case it came down to the fact that play cursor was getting reported in odd
(and highly inaccurate) locations.  Adding the following flags when
creating the bufferdesc DSBCAPS_GETCURRENTPOSITION2 moved it closer to
where I was expecting it.  Although we did end up dividing our buffer into
thirds just to be safe. :)

Ryan

On Tue, 10 Sep 2002, Borut Pfeifer wrote:
> I'm having a problem trying to write a simple vorbis file player using
> DirectSound. The decoding portion is pretty much straight from the
> vorbisfile sample code.  The pcm data gets put into one half of a
> DirectSound buffer, and as that half is playing, the next half gets filled.
> The problem is, there's skipping and some noise when the file is being
> played (although some of the music is audible). Could this this caused by
> the time spent decoding? Wav files work fine so I'm fairly certain
it's not
> the playback code itself. I've tried decoding various amounts at one
time
> but in each case the same thing occurs (although to different degrees).  Is
> there something I can do to fix this without adding a separate decoding
> thread (or is that going to be necessary)? Or could it be something else?
>
> Thanks,
>   Borut
>
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> Ogg project homepage: http://www.xiph.org/ogg/
> To unsubscribe from this list, send a message to
'vorbis-dev-request@xiph.org'
> containing only the word 'unsubscribe' in the body.  No subject is
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>
-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GS d+ s++: a-- C++ UL++ P+ L+ E(----) W++ N++ o? K? w+(--) !O M- !V PS+@
PE+ Y++ PGP t* 5++ X R tv+(-) b+ DI(+) D+ G++ e+++++> h! r%(--) y?
------END GEEK CODE BLOCK------

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Borut Pfeifer" <borut@whiteknucklegames.com> schrieb im Newsbeitrag
news:005001c2590c$ae6b9180$9000a8c0@borut...
> I'm having a problem trying to write a simple vorbis file player using
> DirectSound. The decoding portion is pretty much straight from the
why dont you use the existing Dshow filter from Tobias Waldvogel (
http://tobias.everwicked.com ) or Ingo Ralf Blum (
http://sf.net/projects/mediaxw ) ?

--
Christian

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Soon :  www.corecodec.com

"

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