1 /*
2 * xgal.sndsrv.c - VoxWare(tm) Compatible Sound - Apr. 1995
3 * PC Speaker Compatible Sound
4 * This server is OSS Specific.
5 *
6 * Copyright 1994-1995 Sujal M. Patel (smpatel@wam.umd.edu)
7 * Conditions in "copyright.h"
8 */
9
10 /* $Id: xgal.sndsrv.linux.c,v 1.3 1998/05/11 06:37:20 mrogre Exp $ */
11 #include <config.h>
12
13 #include <time.h>
14 #include <stdio.h>
15 #include <stdlib.h>
16 #include <unistd.h>
17 #include <fcntl.h>
18 #include <sys/ioctl.h>
19 #ifdef __NetBSD__
20 #include <soundcard.h>
21 #else
22 #include <sys/soundcard.h>
23 /*#include "linux_pcsp.h" /usr/include/linux/pcsp.h */
24 #endif
25 #include <sys/time.h>
26 #include <signal.h>
27 #include <string.h>
28
29 #ifndef PCSP_ONLY
30 #define PCSP_ONLY 0
31 #endif
32
33 char *FILENAME[] = {
34 "/explode.raw",
35 "/firetorp.raw",
36 "/shield.raw",
37 "/torphit.raw",
38 "/explode_big.raw",
39 "/ddloo.raw",
40 "/warp.raw",
41 "/smart.raw",
42 };
43
44 #define NUM_SOUNDS (sizeof(FILENAME)/sizeof(char*))
45
46 char *sound_buffer[NUM_SOUNDS];
47 int sound_size[NUM_SOUNDS];
48 int fragsize;
49
50
51 /* Terminate: Signal Handler */
quit()52 void quit ()
53 {
54 exit (0);
55 }
56
57
58
init(int argc,char ** argv)59 void init (int argc, char **argv)
60 {
61 int i;
62 char s[1024];
63
64 if (argc != 3)
65 {
66 printf ("This program is only executed by xgalaga\n");
67 exit (1);
68 }
69
70 for (i=0; i < NUM_SOUNDS; i++)
71 {
72 s[0] = 0;
73 strcat (s, argv[1]);
74 if (s[(int)strlen(s) - 1] == '/') FILENAME[i]++;
75 strcat (s, FILENAME[i]);
76 FILENAME[i] = malloc ((int)strlen (s)+1);
77 strcpy (FILENAME[i],s);
78 sound_buffer[i]=NULL;
79 sound_size[i]=0;
80 }
81
82 signal(SIGTERM, quit); /* Setup Terminate Signal Handler */
83 }
84
85
86 /*
87 Setup DSP: Opens /dev/dsp or /dev/pcdsp
88 Sets fragment size on VoxWare
89 Sets speed to 8000hz
90 Should set mono mode
91 Error checking
92 */
setup_dsp(char * dspdev,int * is_pcsp)93 int setup_dsp (char *dspdev,int *is_pcsp)
94 {
95 int dsp, frag, value;
96 int mixer;
97
98 /* dsp = open(dspdev, O_RDWR); could not hear my oggs the same time */
99 /* dsp = open(dspdev, O_WRONLY | O_NONBLOCK); sound broken only fragmented*/
100 dsp = open(dspdev, O_WRONLY); /* sound is ok*/
101 if (dsp < 0)
102 {
103 fprintf (stderr, "xgal.sndsrv: Couldn't open DSP %s\n",dspdev);
104 return -1;
105 }
106
107 *is_pcsp = 0;
108 fragsize = 0;
109
110 frag = 0x00020009; /* try 512 bytes, for 1/16 second frag size */
111 ioctl(dsp, SNDCTL_DSP_SETFRAGMENT, &frag);
112 value = 8010;
113 if (ioctl(dsp, SNDCTL_DSP_SPEED, &value))
114 {
115 fprintf (stderr, "xgal.sndsrv: Couldn't set DSP rate!\n");
116 };
117 value = 0;
118 ioctl(dsp, SNDCTL_DSP_STEREO, &value);
119 ioctl(dsp, SNDCTL_DSP_GETBLKSIZE, &fragsize);
120 /* fprintf(stderr,"xgal.sndsrv: fragment set to %d\n",fragsize);*/
121
122 if (!fragsize || PCSP_ONLY)
123 {
124 /* Don't Assume just because you can't set the fragment, use proper IOCTL */
125 fprintf (stderr, "xgal.sndsrv: Couldn't set Fragment Size.\nAssuming PC Speaker!\n");
126 fragsize = 128;
127 *is_pcsp = 1;
128 } else {
129 mixer = open("/dev/mixer",O_RDWR | O_NONBLOCK);
130 if(mixer==-1) {
131 fprintf(stderr,"xgal.sndsrv: Couldn't open mixer %s\n","/dev/mixer");
132 return(-1);
133 };
134 #if 0
135 value=0x6464;
136 ioctl(mixer,SOUND_MIXER_WRITE_PCM,&value);
137 ioctl(mixer,SOUND_MIXER_WRITE_VOLUME,&value); /*what does this do?*/
138 #endif
139 close(mixer);
140
141 }
142
143 return dsp;
144 }
145
read_sound(int k)146 int read_sound(int k)
147 {
148 int i,fd,size;
149
150 /*fprintf(stderr,"loading sound %d, %s\n",k,FILENAME[k]);*/
151
152 fd = open(FILENAME[k], O_RDONLY);
153 if(fd < 0)
154 {
155 fprintf (stderr, "xgal.sndsrv: The sound %s could not be opened\n", FILENAME[k]);
156 sound_size[k]=-1;
157 return(0);
158 };
159 size=lseek(fd,0,SEEK_END);
160 sound_size[k]=(size/fragsize)+1; /*size in fragments*/
161 sound_buffer[k]=malloc(sound_size[k]*fragsize);
162 if(sound_buffer[k]==NULL)
163 {
164 fprintf(stderr,"xgal.sndsrv: couldn't malloc memory for sound\n");
165 sound_size[k]=-1;
166 close(fd);
167 return(0);
168 };
169 lseek(fd,0,SEEK_SET);
170 size = read(fd,sound_buffer[k],size);
171 close(fd);
172 if (size) {
173 for(i=0;i<size;i++) sound_buffer[k][i]^=0x80;
174 memset(sound_buffer[k]+size,0,sound_size[k]*fragsize-size);
175 }
176
177 /*fprintf(stderr,"sound has been loaded, %d bytes\n",size);*/ /*DEBUG*/
178 return(1);
179 }
180
181
do_everything(int dsp,int is_pcsp)182 void do_everything (int dsp, int is_pcsp)
183 {
184 signed char k;
185 int i, j ;
186 int terminate = -1; /* Which Sound to Terminate */
187 int playing[16]; /* Sound numbers that we are playing */
188 int position[16]; /* Current position in each sound file */
189 int playnum = 0; /* Number of sounds currently being played */
190 unsigned char final[fragsize]; /* Final Mixing Buffer */
191 int premix[fragsize]; /* Use fragsize in case sound card sets it big. -- JEH */
192 char *sample;
193
194 for(;;) {
195 terminate = -1;
196 /* Try to open a new sound if we get an integer on the 'in' pipe */
197 i=read(STDIN_FILENO,&k,sizeof(k));
198 if(i==0) { /* EOF on pipe means parent has closed its end */
199 /*fprintf(stderr,"xgal.sndsrv: shutting down\n"); */
200 kill(getpid(), SIGTERM);
201 };
202 if(i!=-1) { /* there was something in the pipe */
203 /*fprintf(stderr,"Just read a %d from pipe\n",(int)k);*/ /*DEBUG*/
204 /* Negative means terminate the FIRST sound in the buffer */
205 if(k<0) {
206 /*fprintf(stderr,"terminating sound\n");*/ /*DEBUG*/
207 terminate = 0;
208 } else {
209 if(sound_size[(int)k]==0) read_sound(k);
210 if(sound_size[(int)k]>0 && playnum<16) {
211 position[playnum]=0;
212 playing[playnum++]=k;
213 /*fprintf(stderr,"sound %d added to play queue\n",playnum-1);*/ /*DEBUG*/
214 };
215 };
216 };
217
218 /* terminate a sound if necessary */
219 for(i=0;i<playnum;i++)
220 {
221 if((position[i]==sound_size[playing[i]]) || (terminate==i))
222 {
223 /*fprintf(stderr,"finished playing sound %d\n",i);*/ /*DEBUG*/
224 /*fprintf(stderr,"is was at position %d\n",position[i]);*/ /*DEBUG*/
225 memmove(playing+i,playing+i+1,(playnum-i)*sizeof(int));
226 memmove(position+i,position+i+1,(playnum-i)*sizeof(int));
227 playnum--;i--;
228 };
229 };
230
231 if(playnum) {
232 /* Mix each sound into the final buffer */
233 memset(premix,0,sizeof(premix));
234 for(i=0;i<playnum;i++) {
235 sample=sound_buffer[playing[i]]+position[i]*fragsize;
236 for(j=0;j<fragsize;j++) {
237 premix[j]+=*(sample+j);
238 };
239 position[i]++;
240 };
241 for(i=0;i<fragsize;i++)
242 final[i]=(premix[i]>255)?255:(premix[i]<-256?0:(premix[i]>>1)+128);
243 } else {
244 /*
245 We have no sounds to play
246 Just fill the buffer with silence and maybe play it
247 */
248 memset(final,128,sizeof(final));
249 };
250 i = write (dsp, final, fragsize);
251 /*
252 The sound server is in a tight loop, EXCEPT for this
253 write which blocks. Any optimizations in the above
254 code would really be helpful. Right now the server
255 takes up to 7% cpu on a 486DX/50.
256 */
257 }
258 }
259
260
261
main(argc,argv)262 int main (argc, argv)
263 int argc;
264 char **argv;
265 {
266 int dsp, is_pcsp;
267
268 fcntl(STDIN_FILENO,F_SETFL,O_NONBLOCK);
269 init (argc, argv);
270 dsp = setup_dsp (argv[2],&is_pcsp);
271
272 if (dsp<0) exit(1);
273
274 do_everything (dsp, is_pcsp);
275 return 0;
276 }
277