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460b9539 | 1 | /* |
2 | * This file is part of DisOrder | |
dea8f8aa | 3 | * Copyright (C) 2005, 2006, 2007 Richard Kettlewell |
460b9539 | 4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
18 | * USA | |
19 | */ | |
1674096e | 20 | /** @file server/speaker.c |
cf714d85 | 21 | * @brief Speaker process |
1674096e | 22 | * |
23 | * This program is responsible for transmitting a single coherent audio stream | |
24 | * to its destination (over the network, to some sound API, to some | |
25 | * subprocess). It receives connections from decoders via file descriptor | |
26 | * passing from the main server and plays them in the right order. | |
27 | * | |
795192f4 | 28 | * @b Encodings. For the <a href="http://www.alsa-project.org/">ALSA</a> API, |
29 | * 8- and 16- bit stereo and mono are supported, with any sample rate (within | |
30 | * the limits that ALSA can deal with.) | |
1674096e | 31 | * |
6d2d327c RK |
32 | * Inbound data is expected to match @c config->sample_format. In normal use |
33 | * this is arranged by the @c disorder-normalize program (see @ref | |
34 | * server/normalize.c). | |
1674096e | 35 | * |
795192f4 | 36 | * @b Garbage @b Collection. This program deliberately does not use the |
37 | * garbage collector even though it might be convenient to do so. This is for | |
38 | * two reasons. Firstly some sound APIs use thread threads and we do not want | |
39 | * to have to deal with potential interactions between threading and garbage | |
40 | * collection. Secondly this process needs to be able to respond quickly and | |
41 | * this is not compatible with the collector hanging the program even | |
42 | * relatively briefly. | |
43 | * | |
44 | * @b Units. This program thinks at various times in three different units. | |
45 | * Bytes are obvious. A sample is a single sample on a single channel. A | |
46 | * frame is several samples on different channels at the same point in time. | |
47 | * So (for instance) a 16-bit stereo frame is 4 bytes and consists of a pair of | |
48 | * 2-byte samples. | |
1674096e | 49 | */ |
460b9539 | 50 | |
51 | #include <config.h> | |
52 | #include "types.h" | |
53 | ||
54 | #include <getopt.h> | |
55 | #include <stdio.h> | |
56 | #include <stdlib.h> | |
57 | #include <locale.h> | |
58 | #include <syslog.h> | |
59 | #include <unistd.h> | |
60 | #include <errno.h> | |
61 | #include <ao/ao.h> | |
62 | #include <string.h> | |
63 | #include <assert.h> | |
64 | #include <sys/select.h> | |
9d5da576 | 65 | #include <sys/wait.h> |
460b9539 | 66 | #include <time.h> |
8023f60b | 67 | #include <fcntl.h> |
68 | #include <poll.h> | |
460b9539 | 69 | |
70 | #include "configuration.h" | |
71 | #include "syscalls.h" | |
72 | #include "log.h" | |
73 | #include "defs.h" | |
74 | #include "mem.h" | |
ea410ba1 | 75 | #include "speaker-protocol.h" |
460b9539 | 76 | #include "user.h" |
cf714d85 | 77 | #include "speaker.h" |
460b9539 | 78 | |
cf714d85 | 79 | /** @brief Linked list of all prepared tracks */ |
80 | struct track *tracks; | |
e83d0967 | 81 | |
cf714d85 | 82 | /** @brief Playing track, or NULL */ |
83 | struct track *playing; | |
460b9539 | 84 | |
1c3f1e73 | 85 | /** @brief Number of bytes pre frame */ |
6d2d327c | 86 | size_t bpf; |
1c3f1e73 | 87 | |
88 | /** @brief Array of file descriptors for poll() */ | |
89 | struct pollfd fds[NFDS]; | |
90 | ||
91 | /** @brief Next free slot in @ref fds */ | |
92 | int fdno; | |
93 | ||
460b9539 | 94 | static time_t last_report; /* when we last reported */ |
95 | static int paused; /* pause status */ | |
50ae38dd | 96 | |
5a7c42a8 | 97 | /** @brief The current device state */ |
98 | enum device_states device_state; | |
50ae38dd | 99 | |
55f35f2d | 100 | /** @brief Set when idled |
101 | * | |
102 | * This is set when the sound device is deliberately closed by idle(). | |
55f35f2d | 103 | */ |
1c3f1e73 | 104 | int idled; |
460b9539 | 105 | |
29601377 | 106 | /** @brief Selected backend */ |
107 | static const struct speaker_backend *backend; | |
108 | ||
460b9539 | 109 | static const struct option options[] = { |
110 | { "help", no_argument, 0, 'h' }, | |
111 | { "version", no_argument, 0, 'V' }, | |
112 | { "config", required_argument, 0, 'c' }, | |
113 | { "debug", no_argument, 0, 'd' }, | |
114 | { "no-debug", no_argument, 0, 'D' }, | |
115 | { 0, 0, 0, 0 } | |
116 | }; | |
117 | ||
118 | /* Display usage message and terminate. */ | |
119 | static void help(void) { | |
120 | xprintf("Usage:\n" | |
121 | " disorder-speaker [OPTIONS]\n" | |
122 | "Options:\n" | |
123 | " --help, -h Display usage message\n" | |
124 | " --version, -V Display version number\n" | |
125 | " --config PATH, -c PATH Set configuration file\n" | |
126 | " --debug, -d Turn on debugging\n" | |
127 | "\n" | |
128 | "Speaker process for DisOrder. Not intended to be run\n" | |
129 | "directly.\n"); | |
130 | xfclose(stdout); | |
131 | exit(0); | |
132 | } | |
133 | ||
134 | /* Display version number and terminate. */ | |
135 | static void version(void) { | |
136 | xprintf("disorder-speaker version %s\n", disorder_version_string); | |
137 | xfclose(stdout); | |
138 | exit(0); | |
139 | } | |
140 | ||
1674096e | 141 | /** @brief Return the number of bytes per frame in @p format */ |
6d2d327c | 142 | static size_t bytes_per_frame(const struct stream_header *format) { |
460b9539 | 143 | return format->channels * format->bits / 8; |
144 | } | |
145 | ||
1674096e | 146 | /** @brief Find track @p id, maybe creating it if not found */ |
460b9539 | 147 | static struct track *findtrack(const char *id, int create) { |
148 | struct track *t; | |
149 | ||
150 | D(("findtrack %s %d", id, create)); | |
151 | for(t = tracks; t && strcmp(id, t->id); t = t->next) | |
152 | ; | |
153 | if(!t && create) { | |
154 | t = xmalloc(sizeof *t); | |
155 | t->next = tracks; | |
156 | strcpy(t->id, id); | |
157 | t->fd = -1; | |
158 | tracks = t; | |
460b9539 | 159 | } |
160 | return t; | |
161 | } | |
162 | ||
1674096e | 163 | /** @brief Remove track @p id (but do not destroy it) */ |
460b9539 | 164 | static struct track *removetrack(const char *id) { |
165 | struct track *t, **tt; | |
166 | ||
167 | D(("removetrack %s", id)); | |
168 | for(tt = &tracks; (t = *tt) && strcmp(id, t->id); tt = &t->next) | |
169 | ; | |
170 | if(t) | |
171 | *tt = t->next; | |
172 | return t; | |
173 | } | |
174 | ||
1674096e | 175 | /** @brief Destroy a track */ |
460b9539 | 176 | static void destroy(struct track *t) { |
177 | D(("destroy %s", t->id)); | |
178 | if(t->fd != -1) xclose(t->fd); | |
460b9539 | 179 | free(t); |
180 | } | |
181 | ||
1674096e | 182 | /** @brief Notice a new connection */ |
460b9539 | 183 | static void acquire(struct track *t, int fd) { |
184 | D(("acquire %s %d", t->id, fd)); | |
185 | if(t->fd != -1) | |
186 | xclose(t->fd); | |
187 | t->fd = fd; | |
188 | nonblock(fd); | |
189 | } | |
190 | ||
1674096e | 191 | /** @brief Read data into a sample buffer |
192 | * @param t Pointer to track | |
193 | * @return 0 on success, -1 on EOF | |
194 | * | |
55f35f2d | 195 | * This is effectively the read callback on @c t->fd. It is called from the |
196 | * main loop whenever the track's file descriptor is readable, assuming the | |
197 | * buffer has not reached the maximum allowed occupancy. | |
1674096e | 198 | */ |
460b9539 | 199 | static int fill(struct track *t) { |
200 | size_t where, left; | |
201 | int n; | |
202 | ||
6d2d327c RK |
203 | D(("fill %s: eof=%d used=%zu", |
204 | t->id, t->eof, t->used)); | |
460b9539 | 205 | if(t->eof) return -1; |
6d2d327c | 206 | if(t->used < sizeof t->buffer) { |
460b9539 | 207 | /* there is room left in the buffer */ |
6d2d327c RK |
208 | where = (t->start + t->used) % sizeof t->buffer; |
209 | /* Get as much data as we can */ | |
210 | if(where >= t->start) left = (sizeof t->buffer) - where; | |
211 | else left = t->start - where; | |
460b9539 | 212 | do { |
213 | n = read(t->fd, t->buffer + where, left); | |
214 | } while(n < 0 && errno == EINTR); | |
215 | if(n < 0) { | |
216 | if(errno != EAGAIN) fatal(errno, "error reading sample stream"); | |
217 | return 0; | |
218 | } | |
219 | if(n == 0) { | |
220 | D(("fill %s: eof detected", t->id)); | |
221 | t->eof = 1; | |
222 | return -1; | |
223 | } | |
224 | t->used += n; | |
460b9539 | 225 | } |
226 | return 0; | |
227 | } | |
228 | ||
55f35f2d | 229 | /** @brief Close the sound device |
230 | * | |
231 | * This is called to deactivate the output device when pausing, and also by the | |
232 | * ALSA backend when changing encoding (in which case the sound device will be | |
233 | * immediately reactivated). | |
234 | */ | |
460b9539 | 235 | static void idle(void) { |
460b9539 | 236 | D(("idle")); |
5a7c42a8 | 237 | if(backend->deactivate) |
b5a99ad0 | 238 | backend->deactivate(); |
5a7c42a8 | 239 | else |
240 | device_state = device_closed; | |
e83d0967 | 241 | idled = 1; |
460b9539 | 242 | } |
243 | ||
1674096e | 244 | /** @brief Abandon the current track */ |
1c3f1e73 | 245 | void abandon(void) { |
460b9539 | 246 | struct speaker_message sm; |
247 | ||
248 | D(("abandon")); | |
249 | memset(&sm, 0, sizeof sm); | |
250 | sm.type = SM_FINISHED; | |
251 | strcpy(sm.id, playing->id); | |
252 | speaker_send(1, &sm, 0); | |
253 | removetrack(playing->id); | |
254 | destroy(playing); | |
255 | playing = 0; | |
1c6e6a61 | 256 | } |
257 | ||
1674096e | 258 | /** @brief Enable sound output |
259 | * | |
260 | * Makes sure the sound device is open and has the right sample format. Return | |
261 | * 0 on success and -1 on error. | |
262 | */ | |
5a7c42a8 | 263 | static void activate(void) { |
6d2d327c | 264 | if(backend->activate) |
5a7c42a8 | 265 | backend->activate(); |
6d2d327c | 266 | else |
5a7c42a8 | 267 | device_state = device_open; |
460b9539 | 268 | } |
269 | ||
55f35f2d | 270 | /** @brief Check whether the current track has finished |
271 | * | |
272 | * The current track is determined to have finished either if the input stream | |
273 | * eded before the format could be determined (i.e. it is malformed) or the | |
274 | * input is at end of file and there is less than a frame left unplayed. (So | |
275 | * it copes with decoders that crash mid-frame.) | |
276 | */ | |
460b9539 | 277 | static void maybe_finished(void) { |
278 | if(playing | |
279 | && playing->eof | |
6d2d327c | 280 | && playing->used < bytes_per_frame(&config->sample_format)) |
460b9539 | 281 | abandon(); |
282 | } | |
283 | ||
5a7c42a8 | 284 | /** @brief Play up to @p frames frames of audio |
285 | * | |
286 | * It is always safe to call this function. | |
287 | * - If @ref playing is 0 then it will just return | |
288 | * - If @ref paused is non-0 then it will just return | |
289 | * - If @ref device_state != @ref device_open then it will call activate() and | |
290 | * return if it it fails. | |
291 | * - If there is not enough audio to play then it play what is available. | |
292 | * | |
293 | * If there are not enough frames to play then whatever is available is played | |
294 | * instead. It is up to mainloop() to ensure that play() is not called when | |
295 | * unreasonably only an small amounts of data is available to play. | |
296 | */ | |
460b9539 | 297 | static void play(size_t frames) { |
3c68b773 | 298 | size_t avail_frames, avail_bytes, written_frames; |
9d5da576 | 299 | ssize_t written_bytes; |
460b9539 | 300 | |
5a7c42a8 | 301 | /* Make sure there's a track to play and it is not pasued */ |
302 | if(!playing || paused) | |
460b9539 | 303 | return; |
6d2d327c RK |
304 | /* Make sure the output device is open */ |
305 | if(device_state != device_open) { | |
5a7c42a8 | 306 | activate(); |
307 | if(device_state != device_open) | |
308 | return; | |
460b9539 | 309 | } |
6d2d327c | 310 | D(("play: play %zu/%zu%s %dHz %db %dc", frames, playing->used / bpf, |
460b9539 | 311 | playing->eof ? " EOF" : "", |
6d2d327c RK |
312 | config->sample_format.rate, |
313 | config->sample_format.bits, | |
314 | config->sample_format.channels)); | |
460b9539 | 315 | /* Figure out how many frames there are available to write */ |
6d2d327c | 316 | if(playing->start + playing->used > sizeof playing->buffer) |
7f9d5847 | 317 | /* The ring buffer is currently wrapped, only play up to the wrap point */ |
6d2d327c | 318 | avail_bytes = (sizeof playing->buffer) - playing->start; |
460b9539 | 319 | else |
7f9d5847 | 320 | /* The ring buffer is not wrapped, can play the lot */ |
460b9539 | 321 | avail_bytes = playing->used; |
6d2d327c | 322 | avail_frames = avail_bytes / bpf; |
7f9d5847 | 323 | /* Only play up to the requested amount */ |
324 | if(avail_frames > frames) | |
325 | avail_frames = frames; | |
326 | if(!avail_frames) | |
327 | return; | |
3c68b773 | 328 | /* Play it, Sam */ |
329 | written_frames = backend->play(avail_frames); | |
6d2d327c | 330 | written_bytes = written_frames * bpf; |
e83d0967 RK |
331 | /* written_bytes and written_frames had better both be set and correct by |
332 | * this point */ | |
460b9539 | 333 | playing->start += written_bytes; |
334 | playing->used -= written_bytes; | |
335 | playing->played += written_frames; | |
336 | /* If the pointer is at the end of the buffer (or the buffer is completely | |
337 | * empty) wrap it back to the start. */ | |
6d2d327c | 338 | if(!playing->used || playing->start == (sizeof playing->buffer)) |
460b9539 | 339 | playing->start = 0; |
340 | frames -= written_frames; | |
5a7c42a8 | 341 | return; |
460b9539 | 342 | } |
343 | ||
344 | /* Notify the server what we're up to. */ | |
345 | static void report(void) { | |
346 | struct speaker_message sm; | |
347 | ||
6d2d327c | 348 | if(playing) { |
460b9539 | 349 | memset(&sm, 0, sizeof sm); |
350 | sm.type = paused ? SM_PAUSED : SM_PLAYING; | |
351 | strcpy(sm.id, playing->id); | |
6d2d327c | 352 | sm.data = playing->played / config->sample_format.rate; |
460b9539 | 353 | speaker_send(1, &sm, 0); |
354 | } | |
355 | time(&last_report); | |
356 | } | |
357 | ||
9d5da576 | 358 | static void reap(int __attribute__((unused)) sig) { |
e83d0967 | 359 | pid_t cmdpid; |
9d5da576 | 360 | int st; |
361 | ||
362 | do | |
e83d0967 RK |
363 | cmdpid = waitpid(-1, &st, WNOHANG); |
364 | while(cmdpid > 0); | |
9d5da576 | 365 | signal(SIGCHLD, reap); |
366 | } | |
367 | ||
1c3f1e73 | 368 | int addfd(int fd, int events) { |
460b9539 | 369 | if(fdno < NFDS) { |
370 | fds[fdno].fd = fd; | |
371 | fds[fdno].events = events; | |
372 | return fdno++; | |
373 | } else | |
374 | return -1; | |
375 | } | |
376 | ||
572d74ba | 377 | /** @brief Table of speaker backends */ |
1c3f1e73 | 378 | static const struct speaker_backend *backends[] = { |
572d74ba | 379 | #if API_ALSA |
1c3f1e73 | 380 | &alsa_backend, |
572d74ba | 381 | #endif |
1c3f1e73 | 382 | &command_backend, |
383 | &network_backend, | |
384 | 0 | |
572d74ba | 385 | }; |
386 | ||
5a7c42a8 | 387 | /** @brief Return nonzero if we want to play some audio |
55f35f2d | 388 | * |
5a7c42a8 | 389 | * We want to play audio if there is a current track; and it is not paused; and |
390 | * there are at least @ref FRAMES frames of audio to play, or we are in sight | |
391 | * of the end of the current track. | |
55f35f2d | 392 | */ |
5a7c42a8 | 393 | static int playable(void) { |
394 | return playing | |
395 | && !paused | |
396 | && (playing->used >= FRAMES || playing->eof); | |
397 | } | |
398 | ||
399 | /** @brief Main event loop */ | |
55f35f2d | 400 | static void mainloop(void) { |
572d74ba | 401 | struct track *t; |
402 | struct speaker_message sm; | |
5a7c42a8 | 403 | int n, fd, stdin_slot, timeout; |
460b9539 | 404 | |
460b9539 | 405 | while(getppid() != 1) { |
406 | fdno = 0; | |
5a7c42a8 | 407 | /* By default we will wait up to a second before thinking about current |
408 | * state. */ | |
409 | timeout = 1000; | |
460b9539 | 410 | /* Always ready for commands from the main server. */ |
411 | stdin_slot = addfd(0, POLLIN); | |
412 | /* Try to read sample data for the currently playing track if there is | |
413 | * buffer space. */ | |
6d2d327c | 414 | if(playing && !playing->eof && playing->used < (sizeof playing->buffer)) |
460b9539 | 415 | playing->slot = addfd(playing->fd, POLLIN); |
5a7c42a8 | 416 | else if(playing) |
460b9539 | 417 | playing->slot = -1; |
5a7c42a8 | 418 | if(playable()) { |
419 | /* We want to play some audio. If the device is closed then we attempt | |
420 | * to open it. */ | |
421 | if(device_state == device_closed) | |
422 | activate(); | |
423 | /* If the device is (now) open then we will wait up until it is ready for | |
424 | * more. If something went wrong then we should have device_error | |
425 | * instead, but the post-poll code will cope even if it's | |
426 | * device_closed. */ | |
427 | if(device_state == device_open) | |
428 | backend->beforepoll(); | |
429 | } | |
460b9539 | 430 | /* If any other tracks don't have a full buffer, try to read sample data |
5a7c42a8 | 431 | * from them. We do this last of all, so that if we run out of slots, |
432 | * nothing important can't be monitored. */ | |
460b9539 | 433 | for(t = tracks; t; t = t->next) |
434 | if(t != playing) { | |
6d2d327c | 435 | if(!t->eof && t->used < sizeof t->buffer) { |
9d5da576 | 436 | t->slot = addfd(t->fd, POLLIN | POLLHUP); |
460b9539 | 437 | } else |
438 | t->slot = -1; | |
439 | } | |
e83d0967 RK |
440 | /* Wait for something interesting to happen */ |
441 | n = poll(fds, fdno, timeout); | |
460b9539 | 442 | if(n < 0) { |
443 | if(errno == EINTR) continue; | |
444 | fatal(errno, "error calling poll"); | |
445 | } | |
446 | /* Play some sound before doing anything else */ | |
5a7c42a8 | 447 | if(playable()) { |
448 | /* We want to play some audio */ | |
449 | if(device_state == device_open) { | |
450 | if(backend->ready()) | |
451 | play(3 * FRAMES); | |
452 | } else { | |
453 | /* We must be in _closed or _error, and it should be the latter, but we | |
454 | * cope with either. | |
455 | * | |
456 | * We most likely timed out, so now is a good time to retry. play() | |
457 | * knows to re-activate the device if necessary. | |
458 | */ | |
459 | play(3 * FRAMES); | |
460 | } | |
460b9539 | 461 | } |
462 | /* Perhaps we have a command to process */ | |
463 | if(fds[stdin_slot].revents & POLLIN) { | |
5a7c42a8 | 464 | /* There might (in theory) be several commands queued up, but in general |
465 | * this won't be the case, so we don't bother looping around to pick them | |
466 | * all up. */ | |
460b9539 | 467 | n = speaker_recv(0, &sm, &fd); |
468 | if(n > 0) | |
469 | switch(sm.type) { | |
470 | case SM_PREPARE: | |
471 | D(("SM_PREPARE %s %d", sm.id, fd)); | |
472 | if(fd == -1) fatal(0, "got SM_PREPARE but no file descriptor"); | |
473 | t = findtrack(sm.id, 1); | |
474 | acquire(t, fd); | |
475 | break; | |
476 | case SM_PLAY: | |
477 | D(("SM_PLAY %s %d", sm.id, fd)); | |
478 | if(playing) fatal(0, "got SM_PLAY but already playing something"); | |
479 | t = findtrack(sm.id, 1); | |
480 | if(fd != -1) acquire(t, fd); | |
481 | playing = t; | |
5a7c42a8 | 482 | /* We attempt to play straight away rather than going round the loop. |
483 | * play() is clever enough to perform any activation that is | |
484 | * required. */ | |
485 | play(3 * FRAMES); | |
460b9539 | 486 | report(); |
487 | break; | |
488 | case SM_PAUSE: | |
489 | D(("SM_PAUSE")); | |
490 | paused = 1; | |
491 | report(); | |
492 | break; | |
493 | case SM_RESUME: | |
494 | D(("SM_RESUME")); | |
495 | if(paused) { | |
496 | paused = 0; | |
5a7c42a8 | 497 | /* As for SM_PLAY we attempt to play straight away. */ |
460b9539 | 498 | if(playing) |
5a7c42a8 | 499 | play(3 * FRAMES); |
460b9539 | 500 | } |
501 | report(); | |
502 | break; | |
503 | case SM_CANCEL: | |
504 | D(("SM_CANCEL %s", sm.id)); | |
505 | t = removetrack(sm.id); | |
506 | if(t) { | |
507 | if(t == playing) { | |
508 | sm.type = SM_FINISHED; | |
509 | strcpy(sm.id, playing->id); | |
510 | speaker_send(1, &sm, 0); | |
511 | playing = 0; | |
512 | } | |
513 | destroy(t); | |
514 | } else | |
515 | error(0, "SM_CANCEL for unknown track %s", sm.id); | |
516 | report(); | |
517 | break; | |
518 | case SM_RELOAD: | |
519 | D(("SM_RELOAD")); | |
c00fce3a | 520 | if(config_read(1)) error(0, "cannot read configuration"); |
460b9539 | 521 | info("reloaded configuration"); |
522 | break; | |
523 | default: | |
524 | error(0, "unknown message type %d", sm.type); | |
525 | } | |
526 | } | |
527 | /* Read in any buffered data */ | |
528 | for(t = tracks; t; t = t->next) | |
9d5da576 | 529 | if(t->slot != -1 && (fds[t->slot].revents & (POLLIN | POLLHUP))) |
460b9539 | 530 | fill(t); |
460b9539 | 531 | /* Maybe we finished playing a track somewhere in the above */ |
532 | maybe_finished(); | |
533 | /* If we don't need the sound device for now then close it for the benefit | |
534 | * of anyone else who wants it. */ | |
5a7c42a8 | 535 | if((!playing || paused) && device_state == device_open) |
460b9539 | 536 | idle(); |
537 | /* If we've not reported out state for a second do so now. */ | |
538 | if(time(0) > last_report) | |
539 | report(); | |
540 | } | |
55f35f2d | 541 | } |
542 | ||
543 | int main(int argc, char **argv) { | |
544 | int n; | |
545 | ||
546 | set_progname(argv); | |
547 | if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale"); | |
548 | while((n = getopt_long(argc, argv, "hVc:dD", options, 0)) >= 0) { | |
549 | switch(n) { | |
550 | case 'h': help(); | |
551 | case 'V': version(); | |
552 | case 'c': configfile = optarg; break; | |
553 | case 'd': debugging = 1; break; | |
554 | case 'D': debugging = 0; break; | |
555 | default: fatal(0, "invalid option"); | |
556 | } | |
557 | } | |
558 | if(getenv("DISORDER_DEBUG_SPEAKER")) debugging = 1; | |
559 | /* If stderr is a TTY then log there, otherwise to syslog. */ | |
560 | if(!isatty(2)) { | |
561 | openlog(progname, LOG_PID, LOG_DAEMON); | |
562 | log_default = &log_syslog; | |
563 | } | |
c00fce3a | 564 | if(config_read(1)) fatal(0, "cannot read configuration"); |
6d2d327c | 565 | bpf = bytes_per_frame(&config->sample_format); |
55f35f2d | 566 | /* ignore SIGPIPE */ |
567 | signal(SIGPIPE, SIG_IGN); | |
568 | /* reap kids */ | |
569 | signal(SIGCHLD, reap); | |
570 | /* set nice value */ | |
571 | xnice(config->nice_speaker); | |
572 | /* change user */ | |
573 | become_mortal(); | |
574 | /* make sure we're not root, whatever the config says */ | |
575 | if(getuid() == 0 || geteuid() == 0) fatal(0, "do not run as root"); | |
576 | /* identify the backend used to play */ | |
1c3f1e73 | 577 | for(n = 0; backends[n]; ++n) |
578 | if(backends[n]->backend == config->speaker_backend) | |
55f35f2d | 579 | break; |
1c3f1e73 | 580 | if(!backends[n]) |
55f35f2d | 581 | fatal(0, "unsupported backend %d", config->speaker_backend); |
1c3f1e73 | 582 | backend = backends[n]; |
55f35f2d | 583 | /* backend-specific initialization */ |
584 | backend->init(); | |
585 | mainloop(); | |
460b9539 | 586 | info("stopped (parent terminated)"); |
587 | exit(0); | |
588 | } | |
589 | ||
590 | /* | |
591 | Local Variables: | |
592 | c-basic-offset:2 | |
593 | comment-column:40 | |
594 | fill-column:79 | |
595 | indent-tabs-mode:nil | |
596 | End: | |
597 | */ |