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comparison paradise.sndsrv.linux.c @ 3:5a977ccbc7a9 default tip

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author darius
date Sat, 06 Dec 1997 05:41:29 +0000
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2:fba0b6e6cdc7 3:5a977ccbc7a9
1 /*
2 * paradise.sndsrv.c - USS-Lite Compatible Sound - July 1996
3 * This server is Linux Specific.
4 * Sujal M. Patel (smpatel@umiacs.umd.edu)
5 *
6 *
7 * Copyright (c) 1994-1996, Sujal M. Patel
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $Id: paradise.sndsrv.linux.c,v 1.1.1.1 1997/12/06 05:41:29 darius Exp $
32 */
33
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <unistd.h>
37 #include <fcntl.h>
38 #include <sys/ioctl.h>
39 #include <linux/soundcard.h>
40 #include <sys/time.h>
41 #include <signal.h>
42 #include <string.h>
43
44
45
46 char *FILENAME[] = {
47 "/explode.raw",
48 "/cloak.raw",
49 "/firetorp.raw",
50 "/phaser.raw",
51 "/plasma.raw",
52 "/shield.raw",
53 "/torphit.raw",
54 "/explode_big.raw",
55 "/paradise.raw",
56 "/thermal.raw",
57 "/redalert.raw"
58 };
59
60 #define NUM_SOUNDS (sizeof(FILENAME)/sizeof(char*))
61
62 signed char *sound_buffer[NUM_SOUNDS];
63 int sound_size[NUM_SOUNDS];
64 int fragsize;
65
66
67 /* Terminate: Signal Handler */
68 void quit ()
69 {
70 exit (0);
71 }
72
73
74
75 void init (int argc, char **argv)
76 {
77 int i;
78 char s[1024];
79
80 if (argc != 3)
81 {
82 printf ("This program is only executed by netrek.paradise\n");
83 exit (1);
84 }
85
86 for (i=0; i < NUM_SOUNDS; i++)
87 {
88 s[0] = 0;
89 strcat (s, argv[1]);
90 if (s[(int)strlen(s) - 1] == '/') FILENAME[i]++;
91 strcat (s, FILENAME[i]);
92 FILENAME[i] = malloc ((int)strlen (s));
93 strcpy (FILENAME[i],s);
94 sound_buffer[i]=NULL;
95 sound_size[i]=0;
96 }
97
98 signal(SIGTERM, quit); /* Setup Terminate Signal Handler */
99 }
100
101
102 /*
103 Setup DSP:
104 Sets fragment size on VoxWare
105 Sets speed to 8000hz
106 Should set mono mode
107 Error checking
108 */
109 int setup_dsp (char *dspdev,int *is_pcsp)
110 {
111 int dsp, frag, value;
112 int mixer;
113
114 dsp = open(dspdev, O_RDWR);
115 if (dsp < 1)
116 {
117 fprintf (stderr, "paradise.sndsrv: Couldn't open device %s\n",dspdev);
118 return -1;
119 }
120
121 *is_pcsp = 0;
122 fragsize = 0;
123
124 frag = 0x00020009; /* try 512 bytes, for 1/16 second frag size */
125 ioctl(dsp, SNDCTL_DSP_SETFRAGMENT, &frag);
126 value = 8010;
127 if (ioctl(dsp, SNDCTL_DSP_SPEED, &value))
128 {
129 fprintf (stderr, "paradise.sndsrv: Couldn't set DSP rate!\n");
130 };
131 value = 0;
132 ioctl(dsp, SNDCTL_DSP_STEREO, &value);
133 ioctl(dsp, SNDCTL_DSP_GETBLKSIZE, &fragsize);
134 /*fprintf(stderr,"paradise.sndsrv: fragment set to %d\n",fragsize);*/
135
136 if (!fragsize)
137 {
138 /* Don't Assume just because you can't set the fragment, use proper IOCTL */
139 fprintf (stderr, "paradise.sndsrv: Couldn't set Fragment Size.\nAssuming PC Speaker!\n");
140 fragsize = 128;
141 *is_pcsp = 1;
142 } else {
143 mixer = open("/dev/mixer",O_RDWR | O_NONBLOCK);
144 if(mixer==-1) {
145 fprintf(stderr,"paradise.sndsrv: Couldn't open mixer %s\n","/dev/mixer");
146 return(-1);
147 };
148 value=0x6464;
149 ioctl(mixer,SOUND_MIXER_WRITE_PCM,&value);
150 ioctl(mixer,SOUND_MIXER_WRITE_VOLUME,&value); /*what does this do?*/
151 close(mixer);
152 }
153
154 return dsp;
155 }
156
157 /*
158 This just keeps the pipe from breaking...
159 Eventually I'll look at the paradise signal handlers and
160 just trap this.
161 */
162 int do_nothing(void)
163 {
164 while(1) sleep (5);
165 }
166
167 int read_sound(int k)
168 {
169 int i,fd,size;
170
171 /*fprintf(stderr,"loading sound %d, %s\n",k,FILENAME[k]);*/
172
173 fd = open(FILENAME[k], O_RDONLY);
174 if(fd<=0)
175 {
176 fprintf (stderr, "paradise.sndsrv: The sound %s could not be opened\n", FILENAME[k]);
177 sound_size[k]=-1;
178 return(0);
179 };
180 size=lseek(fd,0,SEEK_END);
181 sound_size[k]=(size/fragsize)+1; /*size in fragments*/
182 sound_buffer[k]=malloc(sound_size[k]*fragsize);
183 if(sound_buffer[k]==NULL)
184 {
185 fprintf(stderr,"paradise.sndsrv: couldn't malloc memory for sound\n");
186 sound_size[k]=-1;
187 close(fd);
188 return(0);
189 };
190 lseek(fd,0,SEEK_SET);
191 read(fd,sound_buffer[k],size);
192 close(fd);
193 for(i=0;i<size;i++) sound_buffer[k][i]^=0x80;
194 memset(sound_buffer[k]+size,0,sound_size[k]*fragsize-size);
195
196 /*fprintf(stderr,"sound has been loaded, %d bytes\n",size);*/ /*DEBUG*/
197 return(1);
198 }
199
200
201 void do_everything (int dsp, int is_pcsp)
202 {
203 char k;
204 int i, j ;
205 int terminate = -1; /* Which Sound to Terminate */
206 int playing[16]; /* Sound numbers that we are playing */
207 int position[16]; /* Current position in each sound file */
208 int playnum = 0; /* Number of sounds currently being played */
209 unsigned char final[512]; /* Final Mixing Buffer */
210 int premix[512];
211 char *sample;
212
213 for(;;) {
214 terminate = -1;
215 /* Try to open a new sound if we get an integer on the 'in' pipe */
216 i=read(STDIN_FILENO,&k,sizeof(k));
217 if(i==0) { /* EOF on pipe means parent has closed its end */
218 /*fprintf(stderr,"paradise.sndsrv: shutting down\n"); */
219 kill(getpid(), SIGTERM);
220 };
221 if(i!=-1) { /* there was something in the pipe */
222 /*fprintf(stderr,"Just read a %d from pipe\n",(int)k);*/ /*DEBUG*/
223 /* Negative means terminate the FIRST sound in the buffer */
224 if(k<0) {
225 /*fprintf(stderr,"terminating sound\n");*/ /*DEBUG*/
226 terminate = 0;
227 } else {
228 if(sound_size[k]==0) read_sound(k);
229 if(sound_size[k]>0 && playnum<16) {
230 position[playnum]=0;
231 playing[playnum++]=k;
232 /*fprintf(stderr,"sound %d added to play queue\n",playnum-1);*/ /*DEBUG*/
233 };
234 };
235 };
236
237 /* terminate a sound if necessary */
238 for(i=0;i<playnum;i++)
239 {
240 if((position[i]==sound_size[playing[i]]) || (terminate==i))
241 {
242 /*fprintf(stderr,"finished playing sound %d\n",i);*/ /*DEBUG*/
243 /*fprintf(stderr,"is was at position %d\n",position[i]);*/ /*DEBUG*/
244 memmove(playing+i,playing+i+1,(playnum-i)*sizeof(int));
245 memmove(position+i,position+i+1,(playnum-i)*sizeof(int));
246 playnum--;i--;
247 };
248 };
249
250 if(playnum) {
251 /* Mix each sound into the final buffer */
252 memset(premix,0,sizeof(premix));
253 for(i=0;i<playnum;i++) {
254 sample=sound_buffer[playing[i]]+position[i]*fragsize;
255 for(j=0;j<fragsize;j++) {
256 premix[j]+=*(sample+j);
257 };
258 position[i]++;
259 };
260 for(i=0;i<fragsize;i++)
261 final[i]=(premix[i]>255)?255:(premix[i]<-256?0:(premix[i]>>1)+128);
262 } else {
263 /*
264 We have no sounds to play
265 Just fill the buffer with silence and maybe play it
266 */
267 memset(final,128,sizeof(final));
268 };
269 write (dsp, final, fragsize);
270 /*
271 The sound server is in a tight loop, EXCEPT for this
272 write which blocks. Any optimizations in the above
273 code would really be helpful. Right now the server
274 takes up to 7% cpu on a 486DX/50.
275 */
276 }
277 }
278
279
280
281 void main (argc, argv)
282 int argc;
283 char **argv;
284 {
285 int dsp, is_pcsp, ppid;
286 char filename[512];
287
288 fcntl(STDIN_FILENO,F_SETFL,O_NONBLOCK);
289 init (argc, argv);
290 dsp = setup_dsp (argv[2],&is_pcsp);
291
292 if (dsp < 1) do_nothing();
293
294 do_everything (dsp, is_pcsp);
295 }