ref: 83d4cf3fd1a257df21468f5bb3b4329e5cf8a40f
dir: /u/snd_next.c/
/*
Copyright (C) 1996-1997 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "quakedef.h"
extern int desired_speed;
extern int desired_bits;
qboolean SNDDMA_Init(void)
{
int size;
size = 16384 + sizeof(dma_t);
shm = malloc (size);
memset((void*)shm, 0, size);
shm->buffer = (char*)shm + sizeof(dma_t);
shm->channels = 2;
shm->speed = desired_speed;
shm->samplebits = desired_bits;
shm->samples = 16384 / (desired_bits / 8);
shm->submission_chunk = 1;
return true;
}
// return the current sample position (in mono samples read)
// inside the recirculating dma buffer
int SNDDMA_GetDMAPos(void)
{
shm->samplepos = (int)(realtime*shm->speed*shm->channels) & (shm->samples-1);
return shm->samplepos;
}
void SNDDMA_Shutdown(void)
{
}