1
2
3 #include <stdio.h>
4 #include <stdlib.h>
5 #include <unistd.h>
6 #include <fcntl.h>
7 #include <sys/ioctl.h>
8 #include <sys/time.h>
9 #include <sys/audio.h>
10 #include <signal.h>
11 #include <string.h>
12
13
14
15 char *FILENAME[] =
16 {
17 "/start.raw",
18 "/end.raw",
19 "/colize.raw",
20 "/destroy1.raw",
21 "/destroy2.raw",
22 "/creator1.raw",
23 "/creator2.raw"
24 };
25
26 #define NUM_SOUNDS (sizeof(FILENAME)/sizeof(char*))
27
28 short *sound_buffer[NUM_SOUNDS];
29 int sound_size[NUM_SOUNDS];
30 #define fragsize (256)
31
32
33 /* Terminate: Signal Handler */
34 void
quit()35 quit ()
36 {
37 exit (0);
38 }
39
40
41
42 void
init(int argc,char ** argv)43 init (int argc, char **argv)
44 {
45 int i;
46 char s[1024];
47
48 if (argc != 3)
49 {
50 printf ("This program is only executed by koules\n");
51 exit (1);
52 }
53
54 for (i = 0; i < NUM_SOUNDS; i++)
55 {
56 s[0] = 0;
57 strcat (s, argv[1]);
58 if (s[(int) strlen (s) - 1] == '/')
59 FILENAME[i]++;
60 strcat (s, FILENAME[i]);
61 FILENAME[i] = malloc ((int) strlen (s) + 1);
62 strcpy (FILENAME[i], s);
63 sound_buffer[i] = NULL;
64 sound_size[i] = 0;
65 }
66
67 signal (SIGTERM, quit); /* Setup Terminate Signal Handler */
68 }
69
70
71 /*
72 Setup DSP: Opens /dev/audio
73 Sets fragment size to 512
74 Error checking
75 */
76 int
setup_dsp(char * dspdev)77 setup_dsp (char *dspdev)
78 {
79 int dsp, frag, value;
80 int mixer;
81
82 dsp = open (dspdev, O_RDWR);
83 if (dsp < 1)
84 {
85 fprintf (stderr, "koules.sndsrv: Couldn't open DSP %s\n", dspdev);
86 return -1;
87 }
88
89 if (-1 == ioctl (dsp, AUDIO_SET_DATA_FORMAT, AUDIO_FORMAT_LINEAR16BIT))
90 {
91 fprintf (stderr, "koules.sndsrv: parameter setting failed");
92 return;
93 }
94
95 if (-1 == ioctl (dsp, AUDIO_SET_CHANNELS, 1))
96 {
97 fprintf (stderr, "koules.sndsrv: parameter setting failed");
98 return;
99 }
100
101 if (-1 == ioctl (dsp, AUDIO_SET_SAMPLE_RATE, 16000))
102 {
103 fprintf (stderr, "koules.sndsrv: parameter setting failed");
104 return -1;
105 }
106
107 if (-1 == ioctl (dsp, AUDIO_SET_OUTPUT, AUDIO_OUT_INTERNAL))
108 {
109 fprintf (stderr, "koules.sndsrv: parameter setting failed");
110 return -1;
111 }
112
113
114 return dsp;
115 }
116
117 /*
118 This just keeps the pipe from breaking...
119 Eventually I'll look at the koules signal handlers and
120 just trap this.
121 */
122 int
do_nothing(void)123 do_nothing (void)
124 {
125 fprintf (stderr, "koules.sndsrv: doing nothing, something is broken\n");
126 while (1)
127 sleep (5);
128 }
129
130 int
read_sound(int k)131 read_sound (int k)
132 {
133 int i, fd, size;
134 unsigned char *b;
135 short *d;
136
137 /* fprintf(stderr,"loading sound %d, %s\n",k,FILENAME[k]); */
138
139 fd = open (FILENAME[k], O_RDONLY);
140 if (fd <= 0)
141 {
142 fprintf (stderr, "koules.sndsrv: The sound %s could not be opened\n", FILENAME[k]);
143 sound_size[k] = -1;
144 return (0);
145 };
146 size = lseek (fd, 0, SEEK_END);
147 sound_size[k] = ((size) / fragsize) + 1; /*size in fragments */
148 sound_buffer[k] = malloc (sound_size[k] * sizeof (short) * fragsize);
149 if (sound_buffer[k] == NULL)
150 {
151 fprintf (stderr, "koules.sndsrv: couldn't malloc memory for sound\n");
152 sound_size[k] = -1;
153 close (fd);
154 return (0);
155 };
156 lseek (fd, 0, SEEK_SET);
157 read (fd, sound_buffer[k], size);
158
159 b = ((unsigned char *) sound_buffer[k]) + sound_size[k] * fragsize;
160 d = sound_buffer[k] + sound_size[k] * fragsize;
161 /* fprintf(stderr,"size = %d\n",sound_size[k]*fragsize); */
162 for (i = 0; i < sound_size[k] * fragsize; i++)
163 {
164 *(--d) = (((short) *(--b)) - 128) << 8;
165 }
166
167 close (fd);
168 bzero (((char *) sound_buffer[k]) + size, sound_size[k] * sizeof (short) * fragsize - size);
169
170 /* fprintf(stderr,"buba! sound has been loaded, %d bytes\n",size); *//*DEBUG */
171 return (1);
172 }
173
174
175 void
do_everything(int dsp)176 do_everything (int dsp)
177 {
178 char k;
179 int i, j;
180 int terminate = -1; /* Which Sound to Terminate */
181 int playing[16]; /* Sound numbers that we are playing */
182 int position[16]; /* Current position in each sound file */
183 int playnum = 0; /* Number of sounds currently being played */
184 short final[fragsize]; /* Final Mixing Buffer */
185 short *sample;
186
187 for (;;)
188 {
189 terminate = -1;
190 /* Try to open a new sound if we get an integer on the 'in' pipe */
191 i = read (STDIN_FILENO, &k, sizeof (k));
192 if (i == 0)
193 { /* EOF on pipe means parent has closed its end */
194 /*fprintf(stderr,"koules.sndsrv: shutting down\n"); */
195 kill (getpid (), SIGTERM);
196 };
197 if (i != -1)
198 { /* there was something in the pipe */
199 /*fprintf(stderr,"Just read a %d from pipe\n",(int)k); *//*DEBUG */
200 /* Negative means terminate the FIRST sound in the buffer */
201 if (k < 0)
202 {
203 fprintf (stderr, "terminating sound\n"); /*DEBUG */
204 terminate = 0;
205 }
206 else
207 {
208 if (sound_size[(int) k] == 0)
209 read_sound (k);
210 if (sound_size[(int) k] > 0 && playnum < 16)
211 {
212 position[playnum] = 0;
213 playing[playnum++] = k;
214 /* fprintf(stderr,"sound %d added to play queue\n",playnum-1); *//*DEBUG */
215 };
216 };
217 };
218
219 /* terminate a sound if necessary */
220 for (i = 0; i < playnum; i++)
221 {
222 if ((position[i] == sound_size[playing[i]]) || (terminate == i))
223 {
224 /* fprintf(stderr,"finished playing sound %d\n",i); *//*DEBUG */
225 /* fprintf(stderr,"is was at position %d\n",position[i]); *//*DEBUG */
226 bcopy (playing + i + 1, playing + i, (playnum - i) * sizeof (int));
227 bcopy (position + i + 1, position + i, (playnum - i) * sizeof (int));
228 playnum--;
229 i--;
230 };
231 };
232
233 memset (final, 0, sizeof (final));
234 if (playnum)
235 {
236 /* Mix each sound into the final buffer */
237 for (i = 0; i < playnum; i++)
238 {
239 short *f = final;
240 sample = sound_buffer[playing[i]] + position[i] * fragsize;
241 for (j = 0; j < fragsize; j++)
242 {
243 long s = *f;
244 s += *sample++;
245 if (s < -32768)
246 {
247 s = -32768;
248 }
249 if (s > 32767)
250 {
251 s = 32767;
252 }
253 *f++ = (short) s;
254 };
255 position[i]++;
256 }
257 }
258 else
259 {
260 /*
261 We have no sounds to play
262 Just fill the buffer with silence and maybe play it
263 */
264 };
265 write (dsp, final, fragsize * sizeof (short));
266 /*
267 The sound server is in a tight loop, EXCEPT for this
268 write which blocks. Any optimizations in the above
269 code would really be helpful. Right now the server
270 takes up to 7% cpu on a 486DX/50.
271 */
272 }
273 }
274
275
276
277 void
main(argc,argv)278 main (argc, argv)
279 int argc;
280 char **argv;
281 {
282 int dsp;
283
284 fcntl (STDIN_FILENO, F_SETFL, O_NONBLOCK);
285 init (argc, argv);
286 dsp = setup_dsp (argv[2]);
287
288 if (!dsp)
289 do_nothing ();
290
291 do_everything (dsp);
292 }
293