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
