ref: bea7b7bf8ccbc2bc41906517079e76fcfb31cb5a
dir: /code/unix/linux_snd.c/
/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
This file is part of Quake III Arena source code.
Quake III Arena source code 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.
Quake III Arena source code 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 Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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>
#ifdef __linux__ // rb0101023 - guard this
#include <linux/soundcard.h>
#endif
#ifdef __FreeBSD__ // rb0101023 - added
#include <sys/soundcard.h>
#endif
#include <stdio.h>
#include "../game/q_shared.h"
#include "../client/snd_local.h"
int audio_fd;
int snd_inited=0;
cvar_t *sndbits;
cvar_t *sndspeed;
cvar_t *sndchannels;
cvar_t *snddevice;
/* Some devices may work only with 48000 */
static int tryrates[] = { 22050, 11025, 44100, 48000, 8000 };
static qboolean use_custom_memset = qfalse;
// https://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=371
void Snd_Memset (void* dest, const int val, const size_t count)
{
int *pDest;
int i, iterate;
if (!use_custom_memset)
{
Com_Memset(dest,val,count);
return;
}
iterate = count / sizeof(int);
pDest = (int*)dest;
for(i=0; i<iterate; i++)
{
pDest[i] = val;
}
}
qboolean SNDDMA_Init(void)
{
int rc;
int fmt;
int tmp;
int i;
// char *s; // bk001204 - unused
struct audio_buf_info info;
int caps;
extern uid_t saved_euid;
if (snd_inited)
return 1;
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;
}
}
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;
}
/* SNDCTL_DSP_GETOSPACE moved to be called later */
// 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;
/* mmap() call moved forward */
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;
}
if (ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info)==-1) {
perror("GETOSPACE");
Com_Printf("Um, can't do GETOSPACE?\n");
close(audio_fd);
return 0;
}
dma.samples = info.fragstotal * info.fragsize / (dma.samplebits/8);
dma.submission_chunk = 1;
// memory map the dma buffer
// TTimo 2001/10/08 added PROT_READ to the mmap
// https://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=371
// checking Alsa bug, doesn't allow dma alloc with PROT_READ?
if (!dma.buffer)
dma.buffer = (unsigned char *) mmap(NULL, info.fragstotal
* info.fragsize, PROT_WRITE|PROT_READ, MAP_FILE|MAP_SHARED, audio_fd, 0);
if (dma.buffer == MAP_FAILED)
{
Com_Printf("Could not mmap dma buffer PROT_WRITE|PROT_READ\n");
Com_Printf("trying mmap PROT_WRITE (with associated better compatibility / less performance code)\n");
dma.buffer = (unsigned char *) mmap(NULL, info.fragstotal
* info.fragsize, PROT_WRITE, MAP_FILE|MAP_SHARED, audio_fd, 0);
// NOTE TTimo could add a variable to force using regular memset on systems that are known to be safe
use_custom_memset = qtrue;
}
if (dma.buffer == MAP_FAILED) {
perror(snddevice->string);
Com_Printf("Could not mmap %s\n", snddevice->string);
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;
}
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;
}
return count.ptr / (dma.samplebits / 8);
}
void SNDDMA_Shutdown(void)
{
}
/*
==============
SNDDMA_Submit
Send sound to device if buffer isn't really the dma buffer
===============
*/
void SNDDMA_Submit(void)
{
}
void SNDDMA_BeginPainting (void)
{
}