quakeforge-old/common/snd_sun.c

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/*
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Copyright (C) 1996-1997 Id Software, Inc.
Copyright (C) 1999,2000 contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors
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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.
*/
#ifdef HAVE_UNISTD_H
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#include <unistd.h>
#endif
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#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 <stdio.h>
#include <sys/audioio.h>
#include <errno.h>
#include "quakedef.h"
int audio_fd;
int snd_inited;
static int wbufp;
static audio_info_t info;
#define BUFFER_SIZE 8192
unsigned char dma_buffer[BUFFER_SIZE];
unsigned char pend_buffer[BUFFER_SIZE];
int pending;
qboolean SNDDMA_Init(void)
{
if (snd_inited) {
printf("Sound already init'd\n");
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return 0;
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}
shm = &sn;
shm->splitbuffer = 0;
audio_fd = open("/dev/audio", O_WRONLY|O_NDELAY);
if (audio_fd < 0) {
if (errno == EBUSY) {
Con_Printf("Audio device is being used by another process\n");
}
perror("/dev/audio");
Con_Printf("Could not open /dev/audio\n");
return (0);
}
if (ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) {
perror("/dev/audio");
Con_Printf("Could not communicate with audio device.\n");
close(audio_fd);
return 0;
}
//
// set to nonblock
//
if (fcntl(audio_fd, F_SETFL, O_NONBLOCK) < 0) {
perror("/dev/audio");
close(audio_fd);
return 0;
}
AUDIO_INITINFO(&info);
shm->speed = 11025;
// try 16 bit stereo
info.play.encoding = AUDIO_ENCODING_LINEAR;
info.play.sample_rate = 11025;
info.play.channels = 2;
info.play.precision = 16;
if (ioctl(audio_fd, AUDIO_SETINFO, &info) < 0) {
info.play.encoding = AUDIO_ENCODING_LINEAR;
info.play.sample_rate = 11025;
info.play.channels = 1;
info.play.precision = 16;
if (ioctl(audio_fd, AUDIO_SETINFO, &info) < 0) {
Con_Printf("Incapable sound hardware.\n");
close(audio_fd);
return 0;
}
Con_Printf("16 bit mono sound initialized\n");
shm->samplebits = 16;
shm->channels = 1;
} else { // 16 bit stereo
Con_Printf("16 bit stereo sound initialized\n");
shm->samplebits = 16;
shm->channels = 2;
}
shm->soundalive = true;
shm->samples = sizeof(dma_buffer) / (shm->samplebits/8);
shm->samplepos = 0;
shm->submission_chunk = 1;
shm->buffer = (unsigned char *)dma_buffer;
snd_inited = 1;
return 1;
}
int SNDDMA_GetDMAPos(void)
{
if (!snd_inited)
return (0);
if (ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) {
perror("/dev/audio");
Con_Printf("Could not communicate with audio device.\n");
close(audio_fd);
snd_inited = 0;
return (0);
}
return ((info.play.samples*shm->channels) % shm->samples);
}
int SNDDMA_GetSamples(void)
{
if (!snd_inited)
return (0);
if (ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) {
perror("/dev/audio");
Con_Printf("Could not communicate with audio device.\n");
close(audio_fd);
snd_inited = 0;
return (0);
}
return info.play.samples;
}
void SNDDMA_Shutdown(void)
{
if (snd_inited) {
close(audio_fd);
snd_inited = 0;
}
}
/*
==============
SNDDMA_Submit
Send sound to device if buffer isn't really the dma buffer
===============
*/
void SNDDMA_Submit(void)
{
int bsize;
int bytes, b;
static unsigned char writebuf[1024];
unsigned char *p;
int idx;
int stop = paintedtime;
if (paintedtime < wbufp)
wbufp = 0; // reset
bsize = shm->channels * (shm->samplebits/8);
bytes = (paintedtime - wbufp) * bsize;
if (!bytes)
return;
if (bytes > sizeof(writebuf)) {
bytes = sizeof(writebuf);
stop = wbufp + bytes/bsize;
}
p = writebuf;
idx = (wbufp*bsize) & (BUFFER_SIZE - 1);
for (b = bytes; b; b--) {
*p++ = dma_buffer[idx];
idx = (idx + 1) & (BUFFER_SIZE - 1);
}
wbufp = stop;
if (write(audio_fd, writebuf, bytes) < bytes)
printf("audio can't keep up!\n");
}