1 /* 2000-08-10T17:39:15Z
3 * handle sounds in emerald mine
6 #include "../libgame/platform.h"
8 #if defined(PLATFORM_LINUX) || defined(PLATFORM_BSD)
11 #include <sys/soundcard.h>
15 #include <soundcard.h>
19 #include <sys/types.h>
21 #include <sys/ioctl.h>
32 static char audioname[] = "/dev/audio";
34 static const int sound_priority[SAMPLE_MAX] = {
35 SAMPLE_exit, SAMPLE_die, SAMPLE_time, SAMPLE_boom, SAMPLE_tick,
36 SAMPLE_collect, SAMPLE_roll, SAMPLE_push, SAMPLE_dynamite, SAMPLE_press,
37 SAMPLE_door, SAMPLE_dirt, SAMPLE_blank, SAMPLE_android, SAMPLE_ball,
38 SAMPLE_grow, SAMPLE_squash, SAMPLE_crack, SAMPLE_slurp, SAMPLE_drip,
39 SAMPLE_wonder, SAMPLE_wheel, SAMPLE_stone, SAMPLE_spring, SAMPLE_diamond,
40 SAMPLE_nut, SAMPLE_bug, SAMPLE_tank, SAMPLE_eater, SAMPLE_alien,
44 int sound_thread(void)
46 int audio_fd; /* file descriptor of /dev/audio or -1 if not open */
50 unsigned char *audio_buffer; /* actual buffer pumped to /dev/audio */
53 char sound_play[SAMPLE_MAX]; /* if set, we should be playing these sounds */
54 long sound_pos[SAMPLE_MAX]; /* position in the sound */
55 int mix_play[MIXER_MAX]; /* which sounds we have chosen to mix (calculated each time) */
62 audio_format = AUDIO_ULAW; /* defaults for non-OSS /dev/audio */
69 memset(sound_play, 0, sizeof(sound_play)); /* not playing any sounds */
74 /* pick sounds to play, if any */
75 if(sound_play[SAMPLE_exit] || sound_play[SAMPLE_die]) sound_play[SAMPLE_boom] = 0; /* no explosions if player goes home */
77 for(i = 0; i < SAMPLE_MAX; i++) {
78 if(sound_play[sound_priority[i]]) {
79 mix_play[mix_count++] = sound_priority[i];
80 if(mix_count == MIXER_MAX) break; /* cant mix too many sounds at once */
84 /* check for incoming messages */
85 if(mix_count || audio_fd != -1) { /* dont block if we are playing sounds */
89 FD_SET(sound_pipe[0], &rfds);
91 tv.tv_usec = 0; /* (900000 * fragment_size / sample_rate) */
92 i = select(sound_pipe[0] + 1, &rfds, 0, 0, &tv); /* dont block */
94 fprintf(stderr, "%s: %s: %s\n", progname, "select failed", strerror(errno));
97 if(i == 0) break; /* no messages */
100 /* get a message and start a sound */
101 i = read(sound_pipe[0], &play, sizeof(play));
103 fprintf(stderr, "%s: %s: %s\n", progname, "read failed", strerror(errno));
107 fprintf(stderr, "%s: %s: %s\n", progname, "read sound", "Broken pipe");
110 if(i != sizeof(play)) {
111 fprintf(stderr, "%s: %s\n", progname, "bad message length");
114 for(i = 0; i < SAMPLE_MAX; i++) {
116 sound_play[i] = 1; /* play this sound */
117 sound_pos[i] = 0; /* start it from the start */
122 /* open the audio device if there are sounds to play */
123 if(mix_count && audio_fd == -1) {
124 audio_fd = open(audioname, O_WRONLY);
125 if(audio_fd == -1) goto reset;
126 #ifdef OPEN_SOUND_SYSTEM
128 if(ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &i) == -1) {
129 fprintf(stderr, "%s: \"%s\": %s (%d): %s\n", progname, audioname, "unable to set fragment size", 512, strerror(errno));
132 if(ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &i) == -1) {
133 fprintf(stderr, "%s: \"%s\": %s: %s\n", progname, audioname, "unable to query audio format", strerror(errno));
136 audio_format = (i & AFMT_U8) ? AFMT_U8 : AFMT_MU_LAW; /* prefer 8 bit unsigned and fall back on mu-law */
138 if(ioctl(audio_fd, SNDCTL_DSP_SETFMT, &i) == -1) {
139 fprintf(stderr, "%s: \"%s\": %s (%d): %s\n", progname, audioname, "unable to set audio format", audio_format, strerror(errno));
142 if(i == AFMT_MU_LAW) {
143 audio_format = AUDIO_ULAW;
144 } else if(i == AFMT_U8) {
145 audio_format = AUDIO_U8;
147 fprintf(stderr, "%s: \"%s\": %s (%d)\n", progname, audioname, "audio format required by device not supported", i);
151 if(ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &i) == -1) {
152 fprintf(stderr, "%s: \"%s\": %s: %s\n", progname, audioname, "unable to set channels to mono", strerror(errno));
156 fprintf(stderr, "%s: \"%s\": %s (%d)\n", progname, audioname, "channels required by device not supported", i);
160 if(ioctl(audio_fd, SNDCTL_DSP_SPEED, &i) == -1) {
161 fprintf(stderr, "%s: \"%s\": %s: %s\n", progname, audioname, "unable to set sampling rate", strerror(errno));
165 if(ioctl(audio_fd, SNDCTL_DSP_GETBLKSIZE, &i) == -1) {
166 fprintf(stderr, "%s: \"%s\": %s: %s\n", progname, audioname, "unable to get block size", strerror(errno));
171 if(fcntl(audio_fd, F_SETFL, O_NONBLOCK) == -1) {
172 fprintf(stderr, "%s: \"%s\": %s: %s\n", progname, audioname, "unable to make audio non blocking", strerror(errno));
175 #endif /* OPEN_SOUND_SYSTEM */
176 audio_buffer = malloc(fragment_size * sizeof(*audio_buffer));
177 if(audio_buffer == 0) {
178 fprintf(stderr, "%s: %s (%d): %s\n", progname, "unable to malloc audio buffer", fragment_size * sizeof(*audio_buffer), strerror(errno));
181 mix_buffer = malloc(fragment_size * sizeof(*mix_buffer));
182 if(mix_buffer == 0) {
183 fprintf(stderr, "%s: %s (%d): %s\n", progname, "unable to malloc mixing buffer", fragment_size * sizeof(*mix_buffer), strerror(errno));
188 /* close the audio device if no sounds are playing */
189 if(mix_count == 0 && audio_fd != -1) {
198 /* if we are playing sounds and the audio device is open, mix them */
199 if(mix_count && audio_fd != -1) {
201 memset(mix_buffer, 0, fragment_size * sizeof(*mix_buffer)); /* prepare mix buffer */
203 for(i = 0; i < mix_count; i++) {
204 register short *mix_ptr = mix_buffer;
205 register short *sound_ptr = sound_data[mix_play[i]] + sound_pos[mix_play[i]];
206 register long count = sound_length[mix_play[i]] - sound_pos[mix_play[i]];
207 if(count > fragment_size) count = fragment_size;
208 while(count--) *mix_ptr++ += *sound_ptr++; /* mix the sounds in */
210 switch(audio_format) {
212 for(i = 0; i < fragment_size; i++) audio_buffer[i] = linear_to_ulaw[mix_buffer[i] + 32768];
215 for(i = 0; i < fragment_size; i++) audio_buffer[i] = (mix_buffer[i] + 32768) >> 8;
219 /* advance sound pointers */
220 for(i = 0; i < SAMPLE_MAX; i++) {
222 if(sound_pos[i] + fragment_size < sound_length[i]) {
223 sound_pos[i] += fragment_size;
230 /* send the data to the audio device */
231 i = write(audio_fd, audio_buffer, fragment_size);
233 fprintf(stderr, "%s: %s: %s\n", progname, "write error", strerror(errno));
236 if(i != fragment_size) {
237 fprintf(stderr, "%s: %s\n", progname, "bad write length");
244 if(audio_fd != -1) close(audio_fd);
245 if(audio_buffer) free(audio_buffer);
246 if(mix_buffer) free(mix_buffer);
247 goto loop; /* back to top */
250 if(audio_fd != -1) close(audio_fd);
251 if(audio_buffer) free(audio_buffer);
252 if(mix_buffer) free(mix_buffer);
256 int read_sample(char *name, short **data, long *length)
264 unsigned char buffer[24];
267 file = fopen(name, "rb");
269 fprintf(stderr, "%s: \"%s\": %s: %s\n", progname, name, "open error", strerror(errno));
270 result = 1; goto fail;
272 actual = fread(buffer, 1, 24, file);
274 fprintf(stderr, "%s: \"%s\": %s: %s\n", progname, name, "read error", strerror(errno));
275 result = 1; goto fail;
278 fprintf(stderr, "%s: \"%s\": %s\n", progname, name, "premature eof");
279 result = 1; goto fail;
281 temp = buffer[0] << 24 | buffer[1] << 16 | buffer[2] << 8 | buffer[3]; /* magic */
282 if(temp != 0x2e736e64) {
283 fprintf(stderr, "%s: \"%s\": %s\n", progname, name, "unrecognized file format");
284 result = 1; goto fail;
286 temp = buffer[4] << 24 | buffer[5] << 16 | buffer[6] << 8 | buffer[7]; /* header length */
288 fprintf(stderr, "%s: \"%s\": %s\n", progname, name, "bad header length");
289 result = 1; goto fail;
292 for(i = 24; i < actual; i++) { /* skip the rest of the header */
297 temp = buffer[8] << 24 | buffer[9] << 16 | buffer[10] << 8 | buffer[11]; /* data length */
299 temp = buffer[12] << 24 | buffer[13] << 16 | buffer[14] << 8 | buffer[15]; /* encoding */
301 fprintf(stderr, "%s: \"%s\": %s (%ld != 1)\n", progname, name, "bad encoding type", temp);
302 result = 1; goto fail;
304 temp = buffer[16] << 24 | buffer[17] << 16 | buffer[18] << 8 | buffer[19]; /* sample rate */
306 fprintf(stderr, "%s: \"%s\": %s (%ld != 8000)\n", progname, name, "bad sample rate", temp);
307 result = 1; goto fail;
309 temp = buffer[20] << 24 | buffer[21] << 16 | buffer[22] << 8 | buffer[23]; /* channels */
311 fprintf(stderr, "%s: \"%s\": %s (%ld != 1)\n", progname, name, "unsupported channels", temp);
312 result = 1; goto fail;
315 dataptr = malloc(datalength * sizeof(*dataptr));
317 fprintf(stderr, "%s: \"%s\": %s (%ld): %s\n", progname, name, "unable to malloc buffer", datalength * sizeof(*dataptr), strerror(errno));
318 result = 1; goto fail;
321 for(i = 0; i < datalength; i++) {
324 dataptr[i] = ulaw_to_linear[ch];
330 *length = datalength;
333 if(file) fclose(file);
337 #endif /* defined(PLATFORM_LINUX) || defined(PLATFORM_BSD) */