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  1. /*
  2. Copyright (C) 1996-1997 Id Software, Inc.
  3.  
  4. This program is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU General Public License
  6. as published by the Free Software Foundation; either version 2
  7. of the License, or (at your option) any later version.
  8.  
  9. This program is distributed in the hope that it will be useful,
  10. but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
  12.  
  13. See the GNU General Public License for more details.
  14.  
  15. You should have received a copy of the GNU General Public License
  16. along with this program; if not, write to the Free Software
  17. Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18.  
  19. */
  20.  
  21. #include "quakedef.h"
  22.  
  23. extern int desired_speed;
  24. extern int desired_bits;
  25.  
  26. qboolean SNDDMA_Init(void)
  27. {
  28.         int size;
  29.  
  30.         size = 16384 + sizeof(dma_t);
  31.         shm = malloc (size);
  32.         memset((void*)shm, 0, size);
  33.  
  34.         shm->buffer = (char*)shm + sizeof(dma_t);
  35.         shm->channels = 2;
  36.         shm->speed = desired_speed;
  37.         shm->samplebits = desired_bits;
  38.         shm->samples = 16384 / (desired_bits / 8);
  39.         shm->submission_chunk = 1;
  40.  
  41.         return true;
  42. }
  43.  
  44. // return the current sample position (in mono samples read)
  45. // inside the recirculating dma buffer
  46. int SNDDMA_GetDMAPos(void)
  47. {
  48.         shm->samplepos = (int)(realtime*shm->speed*shm->channels) & (shm->samples-1);
  49.        
  50.         return shm->samplepos;
  51. }
  52.  
  53. void SNDDMA_Shutdown(void)
  54. {
  55. }
  56.