Thread: C and SDL for audio - Crossfade doesnt work

Hi,

i am currently doing a crossfade system with SDL but i got a problem with the fadeout.

This is my code for the callback function

Code:

int i, j;   

/* Loop that selects the audio slots which are running */   

 for (i = 0; i < NBR_OF_AUDIO_SLOTS; i++) 

{      

      if (soundplayer_isplaying(&audio_slots[i])) 
              {        
                soundplayer * player = &audio_slots[i];
                sound * toplay = player->played_sound;
 
                /* Number of samples */        
                Uint32 nbSamples = len/sizeof(Sint16);          
                for (j = 0; j < nbSamples; j++) 
                     {            
                     Sint16 sound1 = ((Sint16 *)stream)[j];        

                      /* Current sample or 0 if the sound is finished */          
                      Sint16 sound2 = (player->pos < toplay->length) ?  (*(Sint16 *)(toplay->data + player->pos)) : 0;       

                       /* X is the number of sample for the crossfade, equal to 0 everytime i run a new sound */      

                       if (x < 8191 )      
                       {             

                       /* Cosinus function for the crossfade */      
                       double fadeout =  cos( (x * M_PI) / ((nbSamples-1) *2)  );      
                       double fadein = 1 -   cos( (x * M_PI) / ((nbSamples-1) *2)  );            

                       /* Fadeout application */      

                       Uint8 volume = (double)((double)global_volume * fadeout);       
                       sound1 = sample_volume(sound1, volume);            

                       /* Fade in application*/      

                       volume = (double)((double)global_volume * fadein);      
                       sound2 = sample_volume(sound2, volume);              


                       /* Mix the 2 sounds  */         
                      sound2 = sample_mix(sound2, sound1);        

                      x++;      
                      }      
                     else      {      
                                 /* Crossfade is over, keep only the new sound */          

                                 sound2 = sample_volume(sound2, 255);        
                                 }            

                      /* Add to the audio buffer */          
                      ((Sint16 *)stream)[j] = sample;            
                      player->pos += sizeof(Sint16);           
                      }       

                      /* Update */        
                      soundplayer_update(player);      
}   }    }

So when i run 2 sounds one after the other, the first sound stop suddently and the second one fades in. I dont understand why the fadeout doesnt work :S