[SDL] Possible SDL_mixer bug

P. M. polymorphic_messiah at hotmail.com
Fri Jan 24 08:45:00 PST 2003


yeah, it was just some code fired up on the spot to indicate the problem. I 
thought I dynamically allocated some mem for that timer but obvioulsy i 
missed it since i received no SDL_PARACHUTE or any other errors :)  Neways 
the problem on my linux box still stands with every channel between 0-4 
being played except channel 2.

Cheers

>From: "John Popplewell" <john at johnnypops.demon.co.uk>
>Reply-To: sdl at libsdl.org
>To: <sdl at libsdl.org>
>Subject: Re: [SDL] Possible SDL_mixer bug
>Date: Fri, 24 Jan 2003 14:24:47 -0000
>
>Hi,
>
>Testing on Win98. OK apart from the SDL_PARACHUTE!
>These lines are wrong:
>
>     SDL_TimerID *id;
>     ...
>     *id = SDL_AddTimer(300, timer_callback, chunk); /* writes where? */
>
>should be:
>
>     SDL_TimerID id;
>     ...
>     id = SDL_AddTimer(300, timer_callback, chunk);
>
>It played audio on channels 0-4, but the code is a bit strange.
>This is just a test program, right?
>
>cheers,
>John.
>
>
>----- Original Message -----
>From: "P. M." <polymorphic_messiah at hotmail.com>
>To: <sdl at libsdl.org>
>Sent: Thursday, January 23, 2003 8:56 AM
>Subject: Re: [SDL] Possible SDL_mixer bug
>
>
> > This simple test case allocates 5 channels for playing.  As i stated
> > earlier, every channel between the allocated channel boundaries, in this
> > case 0-4, plays the wav sample fine except channel 2.
> >
> > #include <iostream.h>
> > #include <SDL.h>
> > #include <SDL_mixer.h>
> > #include <stdlib.h>
> >
> > Uint32 timer_callback(Uint32 interval, void *p)
> > {
> >   Mix_Chunk *chnk_obj = (Mix_Chunk *) p;
> >
> >   cout << "Num of allocated channels is : " << Mix_AllocateChannels(-1) 
><<
> > endl;
> >   if(Mix_PlayChannel(3,chnk_obj,0) == -1) //channel 2 dont work
> >      cout << "ERROR: Couldnt play wav" << endl;
> >   return interval;
> > }
> >
> > int main(int argc, char **argv)
> > {
> >   Mix_Chunk *chunk;
> >   SDL_TimerID *id;
> >
> >   if(SDL_Init(SDL_INIT_AUDIO | SDL_INIT_TIMER) == -1) {
> >     cout << "ERROR: Couldnt initialize sub-systems" << endl;
> >     exit(-1);
> >   }
> >   cout << "Sub-systems intialized successfully....." << endl;
> >
> >   int freq = 44100;
> >   Uint16 fmt = AUDIO_S16;
> >   int channels = 2;
> >   int chnk_size = 1024;
> >
> >   if(Mix_OpenAudio(freq, fmt, channels, chnk_size)) {
> >     cout << "ERROR: Unable to open audio device" << endl;
> >     exit(-1);
> >   }
> >   cout << "Audio device opened succesfully......" << endl;
> >
> >   Mix_AllocateChannels(5); //using 5 independent channels for testing
> > purposes
> >   if((chunk = Mix_LoadWAV("beep.wav")) == NULL) {
> >     cout << "ERROR: Couldnt load wav" << endl;
> >     exit(-1);
> >   }
> >
> >   cout << "Playing wav file........."  << endl;
> >   *id = SDL_AddTimer(300, timer_callback, chunk);
> >   SDL_Delay(3 * 1000);
> >
> >   return 0;
> > }
> >
> > >From: Sam Lantinga <slouken at devolution.com>
> > >Reply-To: sdl at libsdl.org
> > >To: sdl at libsdl.org
> > >Subject: Re: [SDL] Possible SDL_mixer bug
> > >Date: Wed, 22 Jan 2003 22:09:09 -0800
> > >
> > > > Im not certain whether this is a bug or my mistake.
> > > > Im using Mix_AllocateChannels(8) to obviously produce 8 independent
> > > > channels.
> > > > When i play a wav sample via channel 2 using
>Mix_PlayChannel(2,sample,0)
> > >i
> > > > get no sound.  When i play the sample via any other channel ie
> > >0,1,3,4,5,6,7
> > > > i hear the sample.  Any help would be appreciated.
> > >
> > >Can you put together a simple complete test case, and post it to the
>list?
> > >
> > >Thanks,
> > > -Sam Lantinga, Software Engineer, Blizzard Entertainment
> > >
> > >_______________________________________________
> > >SDL mailing list
> > >SDL at libsdl.org
> > >http://www.libsdl.org/mailman/listinfo/sdl
> >
> >
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>
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