How do I get SDL_mixer to 'share' audio?

SDL Development
1

(This is all taking place in Windows 98 w/ a Creative Soundblaster Live)

If I use:

Mix_OpenAudio(MIX_DEFAULT_FREQUENCY, MIX_DEFAULT_FORMAT,
MIX_DEFAULT_CHANNELS, 4096)

then whenever my application has focus, other applications don’t have access
to the sound card. I know things like Winamp & Starcraft have no problem
playing sound & music at the same time together… Does anyone have any
idea what I might be doing wrong? Major thanks in advance–
Peace,
Amit Jain

2

then whenever my application has focus, other applications don’t have access
to the sound card. I know things like Winamp & Starcraft have no problem
playing sound & music at the same time together… Does anyone have any
idea what I might be doing wrong? Major thanks in advance

Probably we’re setting a wrong flag in the DirectSound backend. Don’t have
anything more insightful to say than that.

–ryan.

3

Weren’t there things like cooperate levels which you need to specify for
your direct sound object and it might be that sdl is trying to set the
highest one available. Anyway- take a look at sources and look for
initialization functions for direct audio and especially for
SetCooperativeLevel and adjust them if you need and then recompile sdl. :slight_smile:

Can anybody correct me, if i’m wrong?

Kovacs> ----- Original Message -----

From: icculus@icculus.org (Ryan C. Gordon)
To:
Sent: Sunday, March 10, 2002 4:31 AM
Subject: Re: [SDL] How do I get SDL_mixer to ‘share’ audio?

then whenever my application has focus, other applications don’t have
access

to the sound card. I know things like Winamp & Starcraft have no
problem

playing sound & music at the same time together… Does anyone have any
idea what I might be doing wrong? Major thanks in advance

Probably we’re setting a wrong flag in the DirectSound backend. Don’t have
anything more insightful to say than that.

–ryan.

SDL mailing list
SDL at libsdl.org
http://www.libsdl.org/mailman/listinfo/sdl

4

then whenever my application has focus, other applications don’t have access
to the sound card. I know things like Winamp & Starcraft have no problem
playing sound & music at the same time together… Does anyone have any
idea what I might be doing wrong? Major thanks in advance

Probably we’re setting a wrong flag in the DirectSound backend. Don’t have
anything more insightful to say than that.

–ryan.

Under win2k, I tried playing an mp3 w/ winamp while simultaneously
playing an ogg + wav with a sdl mixer app. All three played well w/ each
other.

IDirectSound_SetCooperativeLevel(…) is what controls this, and sam seems
to be setting it appriorately in /SDL12/src/audio/windx5/SDL_dx5audio.c
– which would explain why it works for me :).

DaveOn Sat, 9 Mar 2002, Ryan C. Gordon wrote:

–

David MacCormack
@David_MacCormack

:wq
damn!

5

Ryan, Kovacs, David, thank you very much for your help. This is
what I did, if anyone’s interested:

src/audio/windx5/SDL_dx5audio.c:432, changed DSSCL_WRITEPRIMARY to
DSSCL_NORMAL

I haven’t tested this out on 2k or XP but hopefully they’ll work
too. Although looking through all that code, THANK GOD for SDL :
)–
Peace,
Amit Jain

Super-Junior/Sub-Senior, Stevens Institute of Technology
http://www.omlettesoft.com/

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