Source to 321/linux/snd_linux.c
/*
Copyright (C) 1997-2001 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 <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/shm.h>
#include <sys/wait.h>
#include <linux/soundcard.h>
#include <stdio.h>
#include "../client/client.h"
#include "../client/snd_loc.h"
int audio_fd;
int snd_inited;
cvar_t *sndbits;
cvar_t *sndspeed;
cvar_t *sndchannels;
cvar_t *snddevice;
static int tryrates[] = { 11025, 22051, 44100, 8000 };
qboolean SNDDMA_Init(void)
{
int rc;
int fmt;
int tmp;
int i;
char *s;
struct audio_buf_info info;
int caps;
extern uid_t saved_euid;
if (snd_inited)
return;
if (!snddevice) {
sndbits = Cvar_Get("sndbits", "16", CVAR_ARCHIVE);
sndspeed = Cvar_Get("sndspeed", "0", CVAR_ARCHIVE);
sndchannels = Cvar_Get("sndchannels", "2", CVAR_ARCHIVE);
snddevice = Cvar_Get("snddevice", "/dev/dsp", CVAR_ARCHIVE);
}
// open /dev/dsp, confirm capability to mmap, and get size of dma buffer
if (!audio_fd) {
seteuid(saved_euid);
audio_fd = open(snddevice->string, O_RDWR);
seteuid(getuid());
if (audio_fd < 0)
{
perror(snddevice->string);
Com_Printf("Could not open %s\n", snddevice->string);
return 0;
}
}
rc = ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
if (rc < 0)
{
perror(snddevice->string);
Com_Printf("Could not reset %s\n", snddevice->string);
close(audio_fd);
return 0;
}
if (ioctl(audio_fd, SNDCTL_DSP_GETCAPS, &caps)==-1)
{
perror(snddevice->string);
Com_Printf("Sound driver too old\n");
close(audio_fd);
return 0;
}
if (!(caps & DSP_CAP_TRIGGER) || !(caps & DSP_CAP_MMAP))
{
Com_Printf("Sorry but your soundcard can't do this\n");
close(audio_fd);
return 0;
}
if (ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info)==-1)
{
perror("GETOSPACE");
Com_Printf("Um, can't do GETOSPACE?\n");
close(audio_fd);
return 0;
}
// set sample bits & speed
dma.samplebits = (int)sndbits->value;
if (dma.samplebits != 16 && dma.samplebits != 8)
{
ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &fmt);
if (fmt & AFMT_S16_LE) dma.samplebits = 16;
else if (fmt & AFMT_U8) dma.samplebits = 8;
}
dma.speed = (int)sndspeed->value;
if (!dma.speed) {
for (i=0 ; i<sizeof(tryrates)/4 ; i++)
if (!ioctl(audio_fd, SNDCTL_DSP_SPEED, &tryrates[i])) break;
dma.speed = tryrates[i];
}
dma.channels = (int)sndchannels->value;
if (dma.channels < 1 || dma.channels > 2)
dma.channels = 2;
dma.samples = info.fragstotal * info.fragsize / (dma.samplebits/8);
dma.submission_chunk = 1;
// memory map the dma buffer
if (!dma.buffer)
dma.buffer = (unsigned char *) mmap(NULL, info.fragstotal
* info.fragsize, PROT_WRITE, MAP_FILE|MAP_SHARED, audio_fd, 0);
if (!dma.buffer)
{
perror(snddevice->string);
Com_Printf("Could not mmap %s\n", snddevice->string);
close(audio_fd);
return 0;
}
tmp = 0;
if (dma.channels == 2)
tmp = 1;
rc = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
if (rc < 0)
{
perror(snddevice->string);
Com_Printf("Could not set %s to stereo=%d", snddevice->string, dma.channels);
close(audio_fd);
return 0;
}
if (tmp)
dma.channels = 2;
else
dma.channels = 1;
rc = ioctl(audio_fd, SNDCTL_DSP_SPEED, &dma.speed);
if (rc < 0)
{
perror(snddevice->string);
Com_Printf("Could not set %s speed to %d", snddevice->string, dma.speed);
close(audio_fd);
return 0;
}
if (dma.samplebits == 16)
{
rc = AFMT_S16_LE;
rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
if (rc < 0)
{
perror(snddevice->string);
Com_Printf("Could not support 16-bit data. Try 8-bit.\n");
close(audio_fd);
return 0;
}
}
else if (dma.samplebits == 8)
{
rc = AFMT_U8;
rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
if (rc < 0)
{
perror(snddevice->string);
Com_Printf("Could not support 8-bit data.\n");
close(audio_fd);
return 0;
}
}
else
{
perror(snddevice->string);
Com_Printf("%d-bit sound not supported.", dma.samplebits);
close(audio_fd);
return 0;
}
// toggle the trigger & start her up
tmp = 0;
rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
if (rc < 0)
{
perror(snddevice->string);
Com_Printf("Could not toggle.\n");
close(audio_fd);
return 0;
}
tmp = PCM_ENABLE_OUTPUT;
rc = ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &tmp);
if (rc < 0)
{
perror(snddevice->string);
Com_Printf("Could not toggle.\n");
close(audio_fd);
return 0;
}
dma.samplepos = 0;
snd_inited = 1;
return 1;
}
int SNDDMA_GetDMAPos(void)
{
struct count_info count;
if (!snd_inited) return 0;
if (ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &count)==-1)
{
perror(snddevice->string);
Com_Printf("Uh, sound dead.\n");
close(audio_fd);
snd_inited = 0;
return 0;
}
// dma.samplepos = (count.bytes / (dma.samplebits / 8)) & (dma.samples-1);
// fprintf(stderr, "%d \r", count.ptr);
dma.samplepos = count.ptr / (dma.samplebits / 8);
return dma.samplepos;
}
void SNDDMA_Shutdown(void)
{
#if 0
if (snd_inited)
{
close(audio_fd);
snd_inited = 0;
}
#endif
}
/*
==============
SNDDMA_Submit
Send sound to device if buffer isn't really the dma buffer
===============
*/
void SNDDMA_Submit(void)
{
}
void SNDDMA_BeginPainting (void)
{
}