Vorbis dev - Mar 2002 - Ogg Vorbis and DirectSound streaming

hi,
I downloaded the vorbis-sdk-1.0rc3 and wrote an application that plays ogg 
files using DirectSound(win32 application). It uses streaming technique - 
I'm implementing and passing IStream interface to the DirectX. The interface
is used by DirectX to fill his buffers during playing. DirectX is assuming 
that it's readind from a wav file, so the interface decodes on-the-fly so 
that DirectX still thinks it reads from a wav file(emulating also the header 
of the wav file). It plays the songs for some time but at some point the 
application crashesh.

The decoding is built on the vorbisfile sample passing a callback functions 
to ov_open_callbacks(). For the streaming technique to work the IStream 
interface must implement read/seek functions so they are build using only 
ov_read() and ov_pcm_seek() from the vorbis-sdk. First, I thought that the 
problem is that more than one thread is trying to use this functions and it 
forces the application to crash but I've added EnterCriticialSection() and 
LeaveCriticalSection() in the read and seek methods - the problem haven't 
disappeared(the application can mix more than one sound during playing). Can 
someone help me with some hints what the problem can be.

The strange thing is that it crashes randomly(it can play a song one or two 
times and crash during the third play even if I haven't started a secong 
sound to play).

I'm using Visual C++ 6.0, win32 application with code generation for Pentium
Pro and a 2 byte alligment. I have recompiled the voribs libs(static 
linking) with the same parameters as the project.

thanks in advance,
bye

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i have a library which uses the direct sound same way as you describe it and
it works perfectly, i can send you a code snippet which handle the stream
notification, if you want.

Martin Cesky

----- Original Message -----
From: "Xeno Meno" <xenomeno@hotmail.com>
To: <vorbis-dev@xiph.org>
Sent: Thursday, March 21, 2002 1:44 PM
Subject: [vorbis-dev] Ogg Vorbis and DirectSound streaming

<p>> hi,
> I downloaded the vorbis-sdk-1.0rc3 and wrote an application that plays ogg
> files using DirectSound(win32 application). It uses streaming technique -
> I'm implementing and passing IStream interface to the DirectX. The
interface
> is used by DirectX to fill his buffers during playing. DirectX is assuming
> that it's readind from a wav file, so the interface decodes on-the-fly
so
> that DirectX still thinks it reads from a wav file(emulating also the
header
> of the wav file). It plays the songs for some time but at some point the
> application crashesh.
>
> The decoding is built on the vorbisfile sample passing a callback
functions
> to ov_open_callbacks(). For the streaming technique to work the IStream
> interface must implement read/seek functions so they are build using only
> ov_read() and ov_pcm_seek() from the vorbis-sdk. First, I thought that the
> problem is that more than one thread is trying to use this functions and
it
> forces the application to crash but I've added EnterCriticialSection()
and
> LeaveCriticalSection() in the read and seek methods - the problem
haven't
> disappeared(the application can mix more than one sound during playing).
Can
> someone help me with some hints what the problem can be.
>
> The strange thing is that it crashes randomly(it can play a song one or
two
> times and crash during the third play even if I haven't started a
secong
> sound to play).
>
> I'm using Visual C++ 6.0, win32 application with code generation for
Pentium
> Pro and a 2 byte alligment. I have recompiled the voribs libs(static
> linking) with the same parameters as the project.
>
> thanks in advance,
> bye
>
>
> _________________________________________________________________
> Chat with friends online, try MSN Messenger: http://messenger.msn.com
>
>
> --- >8 ----
> List archives:  http://www.xiph.org/archives/
> 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
needed.
> Unsubscribe messages sent to the list will be ignored/filtered.
>
<p>--- >8 ----
List archives:  http://www.xiph.org/archives/
Ogg project homepage: http://www.xiph.org/ogg/
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