Source to quakeworld/client/snd_linux.c
#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 "quakedef.h"
int audio_fd;
int snd_inited;
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;
snd_inited = 0;
// open /dev/dsp, confirm capability to mmap, and get size of dma buffer
audio_fd = open("/dev/dsp", O_RDWR);
if (audio_fd < 0)
{
perror("/dev/dsp");
Con_Printf("Could not open /dev/dsp\n");
return 0;
}
rc = ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
if (rc < 0)
{
perror("/dev/dsp");
Con_Printf("Could not reset /dev/dsp\n");
close(audio_fd);
return 0;
}
if (ioctl(audio_fd, SNDCTL_DSP_GETCAPS, &caps)==-1)
{
perror("/dev/dsp");
Con_Printf("Sound driver too old\n");
close(audio_fd);
return 0;
}
if (!(caps & DSP_CAP_TRIGGER) || !(caps & DSP_CAP_MMAP))
{
Con_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");
Con_Printf("Um, can't do GETOSPACE?\n");
close(audio_fd);
return 0;
}
shm = &sn;
shm->splitbuffer = 0;
// set sample bits & speed
s = getenv("QUAKE_SOUND_SAMPLEBITS");
if (s) shm->samplebits = atoi(s);
else if ((i = COM_CheckParm("-sndbits")) != 0)
shm->samplebits = atoi(com_argv[i+1]);
if (shm->samplebits != 16 && shm->samplebits != 8)
{
ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &fmt);
if (fmt & AFMT_S16_LE) shm->samplebits = 16;
else if (fmt & AFMT_U8) shm->samplebits = 8;
}
s = getenv("QUAKE_SOUND_SPEED");
if (s) shm->speed = atoi(s);
else if ((i = COM_CheckParm("-sndspeed")) != 0)
shm->speed = atoi(com_argv[i+1]);
else
{
for (i=0 ; i<sizeof(tryrates)/4 ; i++)
if (!ioctl(audio_fd, SNDCTL_DSP_SPEED, &tryrates[i])) break;
shm->speed = tryrates[i];
}
s = getenv("QUAKE_SOUND_CHANNELS");
if (s) shm->channels = atoi(s);
else if ((i = COM_CheckParm("-sndmono")) != 0)
shm->channels = 1;
else if ((i = COM_CheckParm("-sndstereo")) != 0)
shm->channels = 2;
else shm->channels = 2;
shm->samples = info.fragstotal * info.fragsize / (shm->samplebits/8);
shm->submission_chunk = 1;
// memory map the dma buffer
shm->buffer = (unsigned char *) mmap(NULL, info.fragstotal
* info.fragsize, PROT_WRITE, MAP_FILE|MAP_SHARED, audio_fd, 0);
if (!shm->buffer)
{
perror("/dev/dsp");
Con_Printf("Could not mmap /dev/dsp\n");
close(audio_fd);
return 0;
}
tmp = 0;
if (shm->channels == 2)
tmp = 1;
rc = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
if (rc < 0)
{
perror("/dev/dsp");
Con_Printf("Could not set /dev/dsp to stereo=%d", shm->channels);
close(audio_fd);
return 0;
}
if (tmp)
shm->channels = 2;
else
shm->channels = 1;
rc = ioctl(audio_fd, SNDCTL_DSP_SPEED, &shm->speed);
if (rc < 0)
{
perror("/dev/dsp");
Con_Printf("Could not set /dev/dsp speed to %d", shm->speed);
close(audio_fd);
return 0;
}
if (shm->samplebits == 16)
{
rc = AFMT_S16_LE;
rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
if (rc < 0)
{
perror("/dev/dsp");
Con_Printf("Could not support 16-bit data. Try 8-bit.\n");
close(audio_fd);
return 0;
}
}
else if (shm->samplebits == 8)
{
rc = AFMT_U8;
rc = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &rc);
if (rc < 0)
{
perror("/dev/dsp");
Con_Printf("Could not support 8-bit data.\n");
close(audio_fd);
return 0;
}
}
else
{
perror("/dev/dsp");
Con_Printf("%d-bit sound not supported.", shm->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("/dev/dsp");
Con_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("/dev/dsp");
Con_Printf("Could not toggle.\n");
close(audio_fd);
return 0;
}
shm->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("/dev/dsp");
Con_Printf("Uh, sound dead.\n");
close(audio_fd);
snd_inited = 0;
return 0;
}
// shm->samplepos = (count.bytes / (shm->samplebits / 8)) & (shm->samples-1);
// fprintf(stderr, "%d \r", count.ptr);
shm->samplepos = count.ptr / (shm->samplebits / 8);
return shm->samplepos;
}
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)
{
}