Vorbis dev - Apr 2002 - AW: Ogg Vorbis and DirectSound streaming

BTW: You can pass also the float32 data directly to DirectSound instead of
doing the conversion (float32->int16) yourself. Have a look at
"WAVEFORMATEXTENSIBLE" in the Windows Platform SDK

Tobias Waldvogel

-----Ursprüngliche Nachricht-----
Von: Martin Cesky [mailto:martin@scssoft.com] 
Gesendet: Dienstag, 2. April 2002 11:02
An: vorbis-dev@xiph.org
Betreff: Re: [vorbis-dev] Ogg Vorbis and DirectSound streaming

<p>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
>
>
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>
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