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xgal.sndsrv.freebsd.c
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C/C++ Source or Header
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1998-04-12
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7KB
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271 lines
/*
* xgal.sndsrv.c - VoxWare(tm) Compatible Sound - Apr. 1995
* PC Speaker Compatible Sound
* This server is FreeBSD Specific.
*
* Copyright 1994-1995 Sujal M. Patel (smpatel@wam.umd.edu)
* Conditions in "copyright.h"
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <machine/soundcard.h>
#include <sys/time.h>
#include <signal.h>
#include <string.h>
char *FILENAME[] = {
"/explode.raw",
"/firetorp.raw",
"/shield.raw",
"/torphit.raw",
"/explode_big.raw",
"/ddloo.raw",
};
#define NUM_SOUNDS (sizeof(FILENAME)/sizeof(char*))
signed char *sound_buffer[NUM_SOUNDS];
int sound_size[NUM_SOUNDS];
int fragsize;
/* Terminate: Signal Handler */
void quit ()
{
exit (0);
}
void init (int argc, char **argv)
{
int i;
char s[1024];
if (argc != 3)
{
printf ("This program is only executed by xgal\n");
exit (1);
}
for (i=0; i < NUM_SOUNDS; i++)
{
s[0] = 0;
strcat (s, argv[1]);
if (s[(int)strlen(s) - 1] == '/') FILENAME[i]++;
strcat (s, FILENAME[i]);
FILENAME[i] = malloc ((int)strlen (s));
strcpy (FILENAME[i],s);
sound_buffer[i]=NULL;
sound_size[i]=0;
}
signal(SIGTERM, quit); /* Setup Terminate Signal Handler */
}
/*
Setup DSP: Opens /dev/dsp or /dev/pcdsp
Sets fragment size on VoxWare
Sets speed to 8000hz
Should set mono mode
Error checking
*/
int setup_dsp (char *dspdev,int *is_pcsp)
{
int dsp, frag, value;
int mixer;
dsp = open(dspdev, O_RDWR);
if (dsp < 1)
{
fprintf (stderr, "xgal.sndsrv: Couldn't open DSP %s\n",dspdev);
return -1;
}
*is_pcsp = 0;
fragsize = 0;
frag = 0x00020009; /* try 512 bytes, for 1/16 second frag size */
ioctl(dsp, SNDCTL_DSP_SETFRAGMENT, &frag);
value = 8010;
if (ioctl(dsp, SNDCTL_DSP_SPEED, &value))
{
fprintf (stderr, "xgal.sndsrv: Couldn't set DSP rate!\n");
};
value = 0;
ioctl(dsp, SNDCTL_DSP_STEREO, &value);
ioctl(dsp, SNDCTL_DSP_GETBLKSIZE, &fragsize);
fprintf(stderr,"xgal.sndsrv: fragment set to %d\n",fragsize);
if (!fragsize)
{
/* Don't Assume just because you can't set the fragment, use proper IOCTL */
fprintf (stderr, "xgal.sndsrv: Couldn't set Fragment Size.\nAssuming PC Speaker!\n");
fragsize = 128;
*is_pcsp = 1;
} else {
mixer = open("/dev/mixer",O_RDWR | O_NONBLOCK);
if(mixer==-1) {
fprintf(stderr,"xgal.sndsrv: Couldn't open mixer %s\n","/dev/mixer");
return(-1);
};
#if 0
value=0x6464;
ioctl(mixer,SOUND_MIXER_WRITE_PCM,&value);
ioctl(mixer,SOUND_MIXER_WRITE_VOLUME,&value); /*what does this do?*/
#endif
close(mixer);
}
return dsp;
}
/*
This just keeps the pipe from breaking...
Eventually I'll look at the xgal signal handlers and
just trap this.
*/
int do_nothing(void)
{
fprintf(stderr,"xgal.sndsrv: doing nothing, something is broken\n");
while(1) sleep (5);
}
int read_sound(int k)
{
int i,fd,size;
/*fprintf(stderr,"loading sound %d, %s\n",k,FILENAME[k]);*/
fd = open(FILENAME[k], O_RDONLY);
if(fd<=0)
{
fprintf (stderr, "xgal.sndsrv: The sound %s could not be opened\n", FILENAME[k]);
sound_size[k]=-1;
return(0);
};
size=lseek(fd,0,SEEK_END);
sound_size[k]=(size/fragsize)+1; /*size in fragments*/
sound_buffer[k]=malloc(sound_size[k]*fragsize);
if(sound_buffer[k]==NULL)
{
fprintf(stderr,"xgal.sndsrv: couldn't malloc memory for sound\n");
sound_size[k]=-1;
close(fd);
return(0);
};
lseek(fd,0,SEEK_SET);
read(fd,sound_buffer[k],size);
close(fd);
for(i=0;i<size;i++) sound_buffer[k][i]^=0x80;
memset(sound_buffer[k]+size,0,sound_size[k]*fragsize-size);
/*fprintf(stderr,"sound has been loaded, %d bytes\n",size);*/ /*DEBUG*/
return(1);
}
void do_everything (int dsp, int is_pcsp)
{
char k;
int i, j ;
int terminate = -1; /* Which Sound to Terminate */
int playing[16]; /* Sound numbers that we are playing */
int position[16]; /* Current position in each sound file */
int playnum = 0; /* Number of sounds currently being played */
unsigned char final[512]; /* Final Mixing Buffer */
int premix[512];
char *sample;
for(;;) {
terminate = -1;
/* Try to open a new sound if we get an integer on the 'in' pipe */
i=read(STDIN_FILENO,&k,sizeof(k));
if(i==0) { /* EOF on pipe means parent has closed its end */
/*fprintf(stderr,"xgal.sndsrv: shutting down\n"); */
kill(getpid(), SIGTERM);
};
if(i!=-1) { /* there was something in the pipe */
/*fprintf(stderr,"Just read a %d from pipe\n",(int)k);*/ /*DEBUG*/
/* Negative means terminate the FIRST sound in the buffer */
if(k<0) {
/*fprintf(stderr,"terminating sound\n");*/ /*DEBUG*/
terminate = 0;
} else {
if(sound_size[k]==0) read_sound(k);
if(sound_size[k]>0 && playnum<16) {
position[playnum]=0;
playing[playnum++]=k;
/*fprintf(stderr,"sound %d added to play queue\n",playnum-1);*/ /*DEBUG*/
};
};
};
/* terminate a sound if necessary */
for(i=0;i<playnum;i++)
{
if((position[i]==sound_size[playing[i]]) || (terminate==i))
{
/*fprintf(stderr,"finished playing sound %d\n",i);*/ /*DEBUG*/
/*fprintf(stderr,"is was at position %d\n",position[i]);*/ /*DEBUG*/
memmove(playing+i,playing+i+1,(playnum-i)*sizeof(int));
memmove(position+i,position+i+1,(playnum-i)*sizeof(int));
playnum--;i--;
};
};
if(playnum) {
/* Mix each sound into the final buffer */
memset(premix,0,sizeof(premix));
for(i=0;i<playnum;i++) {
sample=sound_buffer[playing[i]]+position[i]*fragsize;
for(j=0;j<fragsize;j++) {
premix[j]+=*(sample+j);
};
position[i]++;
};
for(i=0;i<fragsize;i++)
final[i]=(premix[i]>255)?255:(premix[i]<-256?0:(premix[i]>>1)+128);
} else {
/*
We have no sounds to play
Just fill the buffer with silence and maybe play it
*/
memset(final,128,sizeof(final));
};
write (dsp, final, fragsize);
/*
The sound server is in a tight loop, EXCEPT for this
write which blocks. Any optimizations in the above
code would really be helpful. Right now the server
takes up to 7% cpu on a 486DX/50.
*/
}
}
void main (argc, argv)
int argc;
char **argv;
{
int dsp, is_pcsp, ppid;
char filename[512];
fcntl(STDIN_FILENO,F_SETFL,O_NONBLOCK);
init (argc, argv);
dsp = setup_dsp (argv[2],&is_pcsp);
if (!dsp) do_nothing();
do_everything (dsp, is_pcsp);
}