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Re: [pygame] Pygame Mixer Crackle noise not an SDL_Mixer problem
hi,
I think from our testing that it's the combination of using video with
the sound.
Are you able to play any of the SDL test programs with video and sound
to see if there is crackling?
cheers,
On Fri, Apr 18, 2008 at 5:20 PM, etrek <etrek@xxxxxxx> wrote:
> Hi,
> I didn't use any graphics in my SDL program. Just the SDL_Mixer. Here is
> a short example of SDL program that plays the files without noise/crackles.
> This was compiled with DEV-C++ and MinGW.
> #include <stdlib.h>
> #include <SDL.h>
> #include <SDL_Mixer.h>
>
> Mix_Chunk* bounce = NULL; // bounce.wav from Book chapter 10
> Mix_Chunk* msg = NULL; // Please put some .ogg files in the folder.ogg Book
> chapter 10
> Mix_Music *music = NULL; // getout.ogg example from the IrrKlang music
> library
>
> SDL_Surface* createScreen()
> { SDL_Surface *screen;
>
> screen = SDL_SetVideoMode(640, 480, 16, SDL_SWSURFACE);
> if ( screen == NULL ) {
> fprintf(stderr, "Unable to set 640x480 video: %s\n", SDL_GetError());
> exit(1);
> }
> return screen;
>
> }
>
> void quit() {
> Mix_FreeChunk(bounce) ;
> Mix_FreeChunk(msg);
> Mix_FreeMusic(music);
> Mix_CloseAudio();
> SDL_Quit();
> }
>
> int main(int argc, char *argv[])
> {
> if ( SDL_Init(SDL_INIT_EVERYTHING) < 0 ) {
> fprintf(stderr, "Unable to init SDL: %s\n", SDL_GetError());
> exit(1);
> }
>
> SDL_Surface* screen = createScreen();
> SDL_WM_SetCaption( "Hello World", NULL );
> //Update the screen
> if( SDL_Flip( screen ) == -1 ) { return 1; }
>
> // initialize SDL mixer
> if( Mix_OpenAudio( 22050, MIX_DEFAULT_FORMAT, 2, 4096 ) == -1 ) //tried
> these values in Pygame
> {
> return false;
> }
> Mix_AllocateChannels(8);
>
> bounce = Mix_LoadWAV( "bounce.wav" );
> msg = Mix_LoadWAV("please.ogg");
> music = Mix_LoadMUS( "getout.ogg" );
> //If there was a problem loading the sound effects
> if( bounce == NULL ) { return false; }
>
> SDL_Event event;
> while(true) {
> while(SDL_PollEvent(&event)) {
> if(event.type == SDL_QUIT) {
> quit();
> }
> if(event.type == SDL_KEYDOWN) {
> if(event.key.keysym.sym == SDLK_1) {
> if(Mix_PlayChannel(-1, bounce, 0) < 0) {
> quit();
> }
> }
> else if(event.key.keysym.sym == SDLK_2) {
> if(Mix_PlayChannel(-1, msg, 0) < 0) {
> quit();
> }
> }
> else if(event.key.keysym.sym == SDLK_3) {
> if( Mix_PlayMusic( music, -1 ) < 0 ) {
> quit();
> }
> }
> }
> }
> }
> return 0;
> }
>
>
>
> ----- Original Message ----- From: "René Dudfield" <renesd@xxxxxxxxx>
> To: <pygame-users@xxxxxxxx>
> Sent: Thursday, April 17, 2008 11:15 PM
> Subject: Re: [pygame] Pygame Mixer Crackle noise not an SDL_Mixer problem
>
>
>
>
>
> > hi,
> >
> > did your rewritten scripts use video? Or just sound?
> >
> > Do you have a url for your scripts somewhere?
> >
> >
> > cheers,
> >
> >
> >
> > On Fri, Apr 18, 2008 at 4:03 PM, etrek <etrek@xxxxxxx> wrote:
> >
> > >
> > >
> > > Hello Pygame developers: Please read entire message before assuming
> you've
> > > heard this before:)
> > >
> > > I am a new user of Pygame. I have the book "Beginning Game Dev with
> Python
> > > and Pygame". So far I am very impressed with Pygame; It has excellent
> > > graphics response and input capabilities. The sound Mixer library has
> > > problems though.
> > >
> > > When I tried the examples in Chapter 10 "Making Things Go Boom", I
> noticed
> > > a "Crackling" noise when playing sound effects (short wav files) and
> music
> > > (long Ogg files).
> > >
> > > I have searched the archives at Seul.org and searched on Google for
> fixes
> > > to this problem. The solutions suggested basically amount to changing
> > > arguments passed into: pygame.mixer.pre_init(...)
> > > I tried many different settings:
> > > pygame.mixer.pre_init(44100, -16, 2, 4096)
> > > pygame.mixer.pre_init(22050, -16, 2, 4096)
> > > pygame.mixer.pre_init(22050, 16, 2, 1024 * some_number)
> > > Too many to keep listing.
> > > I also tried leaving the settings at default, which actually produces
> the
> > > least amount to crackling.
> > >
> > > I played the music/sound files with Windows Media Player to rule out my
> > > system or bad files. There was no crackling there.
> > >
> > > On some of the Google searches, I saw that people were pointing to the
> > > problem being in the actual SDL_Mixer.
> > >
> > >
> > > So I downloaded SDL/SDL_Mixer extension and re-wrote the example scripts
> in
> > > SDL/C++, using the same music/sound files.
> > > To my surprise, there was NO Crackling noise.
> > >
> > >
> > > So, the problem is NOT my system, it's not the arguments I'm passing
> into
> > > pygame.mixer, and it's not SDL_Mixer.
> > > The problem has to be somewhere in the Pygame Sound/Music libraries.
> > >
> > > I even tried swapping out the SDL_Mixer libs that came with Pygame for
> the
> > > ones that came with SDL_Mixer, and still got the crackling in Pygame.
> > >
> > > It would be nice if this could be fixed. Because the crackling is
> > > essentially making the library unuseable. Which would be a shame,
> because
> > > Pygame is a terrific library/tool.
> > >
> > > Thanks,
> > > Ethan D.
> > > Systems Programmer, SR.
> > > Planetary Lab, Univ Arizona
> > >
> > > My System:
> > > Windows Vista 32bit home premium
> > > IP35-Pro mobo, integrated sound, latest drivers
> > > 4 Gig RAM
> > > Intel Quad core
> > >
> > >
> >
>
>