audiod: kill handle_signal()
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file audiod.c the paraslash's audio daemon */
20
21 #include "para.h"
22
23 #include "audiod.cmdline.h"
24 #include "list.h"
25 #include "sched.h"
26 #include "recv.h"
27 #include "filter.h"
28 #include "grab_client.cmdline.h"
29 #include "grab_client.h"
30 #include "client.cmdline.h"
31 #include "client.h"
32 #include "audiod.h"
33 #include "net.h"
34 #include "daemon.h"
35 #include "string.h"
36 #include "fd.h"
37 #include "write.h"
38 #include "write_common.h"
39 #include "error.h"
40 #include "signal.h"
41
42 /** define the array of error lists needed by para_audiod */
43 INIT_AUDIOD_ERRLISTS;
44 /** define the array containing all supported audio formats */
45 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
46
47 /** defines how to handle one supported audio format */
48 struct audio_format_info {
49 /** pointer to the receiver for this audio format */
50 struct receiver *receiver;
51 /** the receiver configuration */
52 void *receiver_conf;
53 /** the number of filters that should be activated for this audio format */
54 unsigned int num_filters;
55 /** pointer to the array of filters to be activated */
56 struct filter **filters;
57 /** pointer to the array of filter configurations */
58 void **filter_conf;
59 /** the number of filters that should be activated for this audio format */
60 unsigned int num_writers;
61 /** pointer to the array of writers to be activated */
62 struct writer **writers;
63 /** pointer to the array of writer configurations */
64 void **writer_conf;
65 /** do not start receiver/filters/writer before this time */
66 struct timeval restart_barrier;
67 };
68
69 struct slot_info slot[MAX_STREAM_SLOTS];
70
71
72 int audiod_status = AUDIOD_ON;
73
74 struct audiod_args_info conf;
75 static char *socket_name;
76 static FILE *logfile;
77 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
78
79 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
80
81 static struct status_task status_task_struct;
82 struct status_task *stat_task = &status_task_struct;
83 static struct timeval initial_delay_barrier;
84
85 /**
86 * the task for handling audiod commands
87 *
88 * \sa struct task, struct sched
89 */
90 struct command_task {
91 /** the local listening socket */
92 int fd;
93 /** the associated task structure */
94 struct task task;
95 };
96
97 /**
98 * task for signal handling
99 */
100 struct signal_task {
101 /** the signal pipe */
102 int fd;
103 /** the number of the most recent signal */
104 int signum;
105 /** the associated task structure */
106 struct task task;
107 };
108
109 /** iterate over all supported audio formats */
110 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
111
112 /**
113 * get the audio format number
114 * \param name the name of the audio format
115 *
116 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
117 * \a name is not a supported audio format.
118 */
119 int get_audio_format_num(char *name)
120 {
121 int i;
122 FOR_EACH_AUDIO_FORMAT(i)
123 if (!strcmp(name, audio_formats[i]))
124 return i;
125 return -E_UNSUPPORTED_AUDIO_FORMAT;
126 }
127
128 /*
129 * log function. first argument is loglevel.
130 */
131 void para_log(int ll, const char* fmt,...)
132 {
133 va_list argp;
134 FILE *outfd;
135 struct tm *tm;
136 time_t t1;
137 char str[MAXLINE] = "";
138 static char *hostname;
139
140 if (ll < conf.loglevel_arg)
141 return;
142 if (!hostname)
143 hostname = para_hostname();
144 outfd = logfile? logfile : stderr;
145 time(&t1);
146 tm = localtime(&t1);
147 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
148 fprintf(outfd, "%s %s ", str, hostname);
149 if (conf.loglevel_arg <= INFO)
150 fprintf(outfd, "%i ", ll);
151 va_start(argp, fmt);
152 vfprintf(outfd, fmt, argp);
153 va_end(argp);
154 }
155
156 static char *configfile_exists(void)
157 {
158 static char *config_file;
159
160 if (!config_file) {
161 char *home = para_homedir();
162 config_file = make_message("%s/.paraslash/audiod.conf", home);
163 free(home);
164 }
165 return file_exists(config_file)? config_file : NULL;
166 }
167
168 static void setup_signal_handling(void)
169 {
170 sig_task->fd = para_signal_init();
171 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
172 para_install_sighandler(SIGINT);
173 para_install_sighandler(SIGTERM);
174 para_install_sighandler(SIGHUP);
175 signal(SIGPIPE, SIG_IGN);
176 }
177
178 static void clear_slot(int slot_num)
179 {
180 struct slot_info *s = &slot[slot_num];
181
182 PARA_INFO_LOG("clearing slot %d\n", slot_num);
183 memset(s, 0, sizeof(struct slot_info));
184 s->format = -1;
185 }
186
187 static void close_receiver(int slot_num)
188 {
189 struct slot_info *s = &slot[slot_num];
190 struct audio_format_info *a;
191
192 if (s->format < 0 || !s->receiver_node)
193 return;
194 a = &afi[s->format];
195 PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
196 audio_formats[s->format] , slot_num, s->receiver_node->eof);
197 a->receiver->close(s->receiver_node);
198 free(s->receiver_node);
199 s->receiver_node = NULL;
200 }
201
202 static void kill_all_decoders(void)
203 {
204 int i;
205
206 FOR_EACH_SLOT(i) {
207 struct slot_info *s = &slot[i];
208 if (s->wng && !s->wng->eof) {
209 PARA_INFO_LOG("unregistering writer node group in slot %d\n",
210 i);
211 wng_unregister(s->wng);
212 s->wng->eof = 1;
213 }
214 if (s->fc && !s->fc->eof) {
215 PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
216 unregister_task(&s->fc->task);
217 s->fc->eof = 1;
218 }
219 if (s->receiver_node && !s->receiver_node->eof) {
220 PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
221 unregister_task(&s->receiver_node->task);
222 s->receiver_node->eof = 1;
223 }
224 }
225 }
226
227 static int get_empty_slot(void)
228 {
229 int i;
230 struct slot_info *s;
231
232 FOR_EACH_SLOT(i) {
233 s = &slot[i];
234 if (s->format < 0) {
235 clear_slot(i);
236 return i;
237 }
238 if (s->wng || s->receiver_node || s->fc)
239 continue;
240 clear_slot(i);
241 return i;
242 }
243 return -E_NO_MORE_SLOTS;
244 }
245
246 static void close_stat_pipe(void)
247 {
248 int i;
249
250 if (!stat_task->pcd)
251 return;
252 client_close(stat_task->pcd);
253 stat_task->pcd = NULL;
254 for (i = 0; i < NUM_STAT_ITEMS; i++) {
255 free(stat_task->stat_item_values[i]);
256 stat_task->stat_item_values[i] = NULL;
257 }
258 dump_empty_status();
259 stat_task->length_seconds = 0;
260 stat_task->offset_seconds = 0;
261 audiod_status_dump();
262 stat_task->playing = 0;
263 stat_task->stat_item_values[SI_STATUS_BAR] = make_message(
264 "%s:no connection to para_server\n",
265 status_item_list[SI_STATUS_BAR]);
266 stat_client_write(stat_task->stat_item_values[SI_STATUS_BAR],
267 SI_STATUS_BAR);
268 if (stat_task->clock_diff_count) {
269 stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
270 stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
271 }
272 }
273
274 void __noreturn clean_exit(int status, const char *msg)
275 {
276 PARA_EMERG_LOG("%s\n", msg);
277 if (socket_name)
278 unlink(socket_name);
279 close_stat_pipe();
280 exit(status);
281 }
282
283 /**
284 * get the number of filters
285 *
286 * \param audio_format_num the number identifying the audio format
287 *
288 * \return the number of filters for the given audio format
289 *
290 * \sa struct filter;
291 */
292 int num_filters(int audio_format_num)
293 {
294 return afi[audio_format_num].num_filters;
295 }
296
297 static void filter_event_handler(struct task *t)
298 {
299 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
300 struct filter_chain *fc = t->private_data;
301 fc->eof = 1;
302 unregister_task(t);
303 }
304
305 static void open_filters(int slot_num)
306 {
307 struct slot_info *s = &slot[slot_num];
308 struct audio_format_info *a = &afi[s->format];
309 int nf = a->num_filters;
310 int i;
311
312 s->fc = NULL;
313 if (!nf)
314 return;
315 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
316 s->fc = para_calloc(sizeof(struct filter_chain));
317 INIT_LIST_HEAD(&s->fc->filters);
318 s->fc->inbuf = s->receiver_node->buf;
319 s->fc->in_loaded = &s->receiver_node->loaded;
320 s->fc->input_eof = &s->receiver_node->eof;
321 s->fc->task.pre_select = filter_pre_select;
322 s->fc->task.event_handler = filter_event_handler;
323 s->fc->task.private_data = s->fc;
324 s->fc->eof = 0;
325
326 s->receiver_node->output_eof = &s->fc->eof;
327 sprintf(s->fc->task.status, "filter chain");
328 for (i = 0; i < nf; i++) {
329 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
330 fn->conf = a->filter_conf[i];
331 fn->fc = s->fc;
332 fn->filter = a->filters[i];
333 INIT_LIST_HEAD(&fn->callbacks);
334 list_add_tail(&fn->node, &s->fc->filters);
335 fn->filter->open(fn);
336 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
337 audio_formats[s->format], i + 1, nf,
338 fn->filter->name, slot_num);
339 s->fc->outbuf = fn->buf;
340 s->fc->out_loaded = &fn->loaded;
341 }
342 register_task(&s->fc->task);
343 }
344
345 static void wng_event_handler(struct task *t)
346 {
347 struct writer_node_group *wng = t->private_data;
348
349 PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
350 wng->eof = 1;
351 wng_unregister(wng);
352 }
353
354 static void open_writers(int slot_num)
355 {
356 int ret, i;
357 struct slot_info *s = &slot[slot_num];
358 struct audio_format_info *a = &afi[s->format];
359
360 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
361 if (!a->num_writers)
362 s->wng = setup_default_wng();
363 else
364 s->wng = wng_new(a->num_writers);
365 if (s->fc) {
366 s->wng->buf = s->fc->outbuf;
367 s->wng->loaded = s->fc->out_loaded;
368 s->wng->input_eof = &s->fc->eof;
369 s->wng->channels = &s->fc->channels;
370 s->wng->samplerate = &s->fc->samplerate;
371 s->fc->output_eof = &s->wng->eof;
372 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
373 } else {
374 s->wng->buf = s->receiver_node->buf;
375 s->wng->loaded = &s->receiver_node->loaded;
376 s->wng->input_eof = &s->receiver_node->eof;
377 }
378 s->wng->task.event_handler = wng_event_handler;
379 for (i = 0; i < a->num_writers; i++) {
380 s->wng->writer_nodes[i].conf = a->writer_conf[i];
381 s->wng->writer_nodes[i].writer = a->writers[i];
382 }
383 ret = wng_open(s->wng);
384 if (ret < 0) {
385 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
386 return;
387 }
388 s->wstime = *now;
389 activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
390 }
391
392 static void rn_event_handler(struct task *t)
393 {
394 struct receiver_node *rn = t->private_data;
395 const struct timeval restart_delay = {0, 10 * 1000};
396 int i;
397
398 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
399 unregister_task(t);
400 rn->eof = 1;
401 /* set restart barrier */
402 FOR_EACH_SLOT(i) {
403 if (slot[i].receiver_node != rn)
404 continue;
405 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
406 }
407 }
408
409 static int open_receiver(int format)
410 {
411 struct audio_format_info *a = &afi[format];
412 struct slot_info *s;
413 int ret, slot_num;
414 struct receiver_node *rn;
415 const struct timeval restart_delay = {1, 0};
416
417 ret = get_empty_slot();
418 if (ret < 0)
419 goto err;
420 slot_num = ret;
421 s = &slot[slot_num];
422 s->format = format;
423 s->receiver_node = para_calloc(sizeof(struct receiver_node));
424 rn = s->receiver_node;
425 rn->receiver = a->receiver;
426 rn->conf = a->receiver_conf;
427 ret = a->receiver->open(s->receiver_node);
428 if (ret < 0) {
429 free(s->receiver_node);
430 s->receiver_node = NULL;
431 goto err;
432 }
433 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
434 audio_formats[s->format], a->receiver->name, slot_num);
435 rn->task.private_data = s->receiver_node;
436 rn->task.pre_select = a->receiver->pre_select;
437 rn->task.post_select = a->receiver->post_select;
438 rn->task.event_handler = rn_event_handler;
439 sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
440 register_task(&rn->task);
441 return 1;
442 err:
443 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
444 tv_add(now, &restart_delay, &afi[format].restart_barrier);
445 return ret;
446 }
447
448 static int receiver_running(int format)
449 {
450 int i;
451
452 FOR_EACH_SLOT(i) {
453 struct slot_info *s = &slot[i];
454 if (s->format == format && s->receiver_node
455 && !s->receiver_node->eof)
456 return 1;
457 }
458 return 0;
459 }
460
461 static int open_current_receiver(struct sched *s)
462 {
463 int i;
464 struct timeval diff;
465 char *audio_format = stat_task->stat_item_values[SI_FORMAT];
466
467 if (!audio_format || !stat_task->pcd)
468 return 0;
469 i = get_audio_format_num(audio_format + strlen(
470 status_item_list[SI_FORMAT]) + 1);
471 if (i < 0)
472 return 0;
473 if (receiver_running(i))
474 return 0;
475 if (tv_diff(now, &afi[i].restart_barrier, &diff) < 0) {
476 s->timeout = diff;
477 return 0;
478 }
479 return open_receiver(i) < 0? 0 : 1;
480 }
481
482 static void compute_time_diff(const struct timeval *status_time)
483 {
484 struct timeval tmp, diff;
485 static int count;
486 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
487 const struct timeval max_deviation = {0, 500 * 1000};
488 const int time_smooth = 5;
489
490 sign = tv_diff(status_time, now, &diff);
491 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
492 // sign, sa_time_diff_sign);
493 if (!count) {
494 sa_time_diff_sign = sign;
495 stat_task->sa_time_diff = diff;
496 count++;
497 goto out;
498 }
499 if (count > 5) {
500 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
501 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
502 PARA_WARNING_LOG("time diff jump: %lims\n",
503 s * tv2ms(&tmp));
504 }
505 count++;
506 sa_time_diff_sign = tv_convex_combination(
507 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
508 count > 10? sign : sign * time_smooth, &diff,
509 &tmp);
510 stat_task->sa_time_diff = tmp;
511 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
512 sign > 0? "+" : "-",
513 tv2ms(&diff),
514 sa_time_diff_sign ? "+" : "-",
515 tv2ms(&stat_task->sa_time_diff)
516 );
517 out:
518 stat_task->sa_time_diff_sign = sa_time_diff_sign;
519 }
520
521 static void check_stat_line(char *line)
522 {
523 int itemnum;
524 size_t ilen = 0;
525 long unsigned sec, usec;
526 char *tmp;
527
528 // PARA_INFO_LOG("line: %s\n", line);
529 if (!line)
530 return;
531 itemnum = stat_line_valid(line);
532 if (itemnum < 0) {
533 PARA_WARNING_LOG("invalid status line: %s\n", line);
534 return;
535 }
536 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
537 return;
538 tmp = make_message("%s\n", line);
539 stat_client_write(tmp, itemnum);
540 free(tmp);
541 free(stat_task->stat_item_values[itemnum]);
542 stat_task->stat_item_values[itemnum] = para_strdup(line);
543 ilen = strlen(status_item_list[itemnum]);
544 switch (itemnum) {
545 case SI_STATUS:
546 stat_task->playing = strstr(line, "playing")? 1 : 0;
547 break;
548 case SI_OFFSET:
549 stat_task->offset_seconds = atoi(line + ilen + 1);
550 break;
551 case SI_LENGTH:
552 stat_task->length_seconds = atoi(line + ilen + 1);
553 break;
554 case SI_STREAM_START:
555 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
556 struct timeval a_start, delay;
557 delay.tv_sec = conf.stream_delay_arg / 1000;
558 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
559 stat_task->server_stream_start.tv_sec = sec;
560 stat_task->server_stream_start.tv_usec = usec;
561 if (stat_task->sa_time_diff_sign < 0)
562 tv_add(&stat_task->server_stream_start,
563 &stat_task->sa_time_diff, &a_start);
564 else
565 tv_diff(&stat_task->server_stream_start,
566 &stat_task->sa_time_diff, &a_start);
567 tv_add(&a_start, &delay, &initial_delay_barrier);
568 }
569 break;
570 case SI_CURRENT_TIME:
571 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
572 struct timeval tv = {sec, usec};
573 compute_time_diff(&tv);
574 }
575 if (stat_task->clock_diff_count)
576 stat_task->clock_diff_count--;
577 break;
578 }
579 }
580
581 static void try_to_close_slot(int slot_num)
582 {
583 struct slot_info *s = &slot[slot_num];
584
585 if (s->format < 0)
586 return;
587 if (s->receiver_node && !s->receiver_node->eof)
588 return;
589 if (s->fc && !s->fc->eof)
590 return;
591 if (s->wng && !s->wng->eof)
592 return;
593 PARA_INFO_LOG("closing slot %d \n", slot_num);
594 wng_close(s->wng);
595 close_filters(s->fc);
596 free(s->fc);
597 close_receiver(slot_num);
598 clear_slot(slot_num);
599 }
600
601 /*
602 * Check if any receivers/filters/writers need to be started and do so if
603 * neccessary. Since the pre_select function didn't have a chance yet to put
604 * file descriptors into the fd sets given by s, make the upcoming select()
605 * return immediately to avoid a long timeout in case we started something.
606 */
607 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
608 {
609 int i;
610 struct timeval min_delay = {0, 1};
611
612 t->ret = 1;
613 if (audiod_status != AUDIOD_ON || !stat_task->playing)
614 return kill_all_decoders();
615 if (open_current_receiver(s))
616 s->timeout = min_delay;
617 FOR_EACH_SLOT(i) {
618 struct slot_info *sl = &slot[i];
619 struct audio_format_info *a;
620 struct timeval diff;
621
622 if (sl->format < 0)
623 continue;
624 a = &afi[sl->format];
625 if (!sl->receiver_node)
626 continue;
627 if (!a->num_filters) {
628 if (sl->receiver_node->loaded && !sl->wng) {
629 open_writers(i);
630 s->timeout = min_delay;
631 }
632 continue;
633 }
634 if (sl->receiver_node->loaded && !sl->fc) {
635 open_filters(i);
636 s->timeout = min_delay;
637 continue;
638 }
639 if (!sl->fc || !*sl->fc->out_loaded || sl->wng)
640 continue;
641 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
642 open_writers(i);
643 s->timeout = min_delay;
644 continue;
645 }
646 PARA_INFO_LOG("inital delay: %lu ms left\n", tv2ms(&diff));
647 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
648 s->timeout = diff;
649 }
650 }
651 }
652
653 static void audiod_post_select(__a_unused struct sched *s,
654 __a_unused struct task *t)
655 {
656 int i;
657
658 t->ret = 1;
659 FOR_EACH_SLOT(i)
660 try_to_close_slot(i);
661 }
662
663 static void init_audiod_task(struct task *t)
664 {
665 t->pre_select = audiod_pre_select;
666 t->post_select = audiod_post_select;
667 t->event_handler = NULL;
668 t->private_data = t;
669 sprintf(t->status, "audiod task");
670 }
671
672 static int parse_stream_command(const char *txt, char **cmd)
673 {
674 char *p = strchr(txt, ':');
675 int i;
676
677 if (!p)
678 return -E_MISSING_COLON;
679 p++;
680 FOR_EACH_AUDIO_FORMAT(i) {
681 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
682 continue;
683 *cmd = p;
684 return i;
685 }
686 return -E_UNSUPPORTED_AUDIO_FORMAT;
687 }
688
689 static int add_filter(int format, char *cmdline)
690 {
691 struct audio_format_info *a = &afi[format];
692 int filter_num, nf = a->num_filters;
693
694 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
695 if (filter_num < 0)
696 return filter_num;
697 a->filters[nf] = &filters[filter_num];
698 a->num_filters++;
699 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
700 a->filters[nf]->name);
701 return filter_num;
702 }
703
704 static int init_writers(void)
705 {
706 int i, ret, nw;
707 char *cmd;
708 struct audio_format_info *a;
709
710 init_supported_writers();
711 nw = PARA_MAX(1, conf.writer_given);
712 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
713 FOR_EACH_AUDIO_FORMAT(i) {
714 a = &afi[i];
715 a->writer_conf = para_malloc(nw * sizeof(void *));
716 a->writers = para_malloc(nw * sizeof(struct writer *));
717 a->num_writers = 0;
718 }
719 for (i = 0; i < conf.writer_given; i++) {
720 void *wconf;
721 int writer_num;
722 ret = parse_stream_command(conf.writer_arg[i], &cmd);
723 if (ret < 0)
724 goto out;
725 a = &afi[ret];
726 nw = a->num_writers;
727 wconf = check_writer_arg(cmd, &writer_num);
728 if (!wconf) {
729 ret = writer_num;
730 goto out;
731 }
732 a->writers[nw] = &writers[writer_num];
733 a->writer_conf[nw] = wconf;
734 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
735 nw, writer_names[writer_num]);
736 a->num_writers++;
737 }
738 ret = 1;
739 out:
740 return ret;
741 }
742
743 static int init_receivers(void)
744 {
745 int i, ret, receiver_num;
746 char *cmd = NULL;
747 struct audio_format_info *a;
748
749 for (i = 0; receivers[i].name; i++) {
750 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
751 receivers[i].init(&receivers[i]);
752 }
753 for (i = conf.receiver_given - 1; i >= 0; i--) {
754 char *arg = conf.receiver_arg[i];
755 char *recv_arg = strchr(arg, ':');
756 ret = -E_MISSING_COLON;
757 if (!recv_arg)
758 goto out;
759 *recv_arg = '\0';
760 recv_arg++;
761 ret = get_audio_format_num(arg);
762 if (ret < 0)
763 goto out;
764 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
765 if (!afi[ret].receiver_conf) {
766 ret = -E_RECV_SYNTAX;
767 goto out;
768 }
769 afi[ret].receiver = &receivers[receiver_num];
770 }
771 /* use the first available receiver with no arguments
772 * for those audio formats for which no receiver
773 * was specified
774 */
775 cmd = para_strdup(receivers[0].name);
776 FOR_EACH_AUDIO_FORMAT(i) {
777 a = &afi[i];
778 if (a->receiver_conf)
779 continue;
780 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
781 if (!a->receiver_conf)
782 return -E_RECV_SYNTAX;
783 a->receiver = &receivers[receiver_num];
784 }
785 ret = 1;
786 out:
787 free(cmd);
788 return ret;
789 }
790
791 static int init_default_filters(void)
792 {
793 int i, ret = 1;
794
795 FOR_EACH_AUDIO_FORMAT(i) {
796 struct audio_format_info *a = &afi[i];
797 char *tmp;
798 int j;
799
800 if (a->num_filters)
801 continue; /* no default -- nothing to to */
802 /* add "dec" to audio format name */
803 tmp = make_message("%sdec", audio_formats[i]);
804 for (j = 0; filters[j].name; j++)
805 if (!strcmp(tmp, filters[j].name))
806 break;
807 free(tmp);
808 ret = -E_UNSUPPORTED_FILTER;
809 if (!filters[j].name)
810 goto out;
811 tmp = para_strdup(filters[j].name);
812 ret = add_filter(i, tmp);
813 free(tmp);
814 if (ret < 0)
815 goto out;
816 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
817 filters[j].name);
818 }
819 out:
820 return ret;
821 }
822
823 static int init_filters(void)
824 {
825 int i, ret, nf;
826
827 filter_init(filters);
828 nf = PARA_MAX(1, conf.filter_given);
829 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
830 FOR_EACH_AUDIO_FORMAT(i) {
831 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
832 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
833 }
834 if (!conf.no_default_filters_given)
835 return init_default_filters();
836 for (i = 0; i < conf.filter_given; i++) {
837 char *arg = conf.filter_arg[i];
838 char *filter_name = strchr(arg, ':');
839 ret = -E_MISSING_COLON;
840 if (!filter_name)
841 goto out;
842 *filter_name = '\0';
843 filter_name++;
844 ret = get_audio_format_num(arg);
845 if (ret < 0)
846 goto out;
847 ret = add_filter(ret, filter_name);
848 if (ret < 0)
849 goto out;
850 }
851 ret = init_default_filters(); /* use default values for the rest */
852 out:
853 return ret;
854 }
855
856 static int init_stream_io(void)
857 {
858 int ret;
859
860 ret = init_writers();
861 if (ret < 0)
862 return ret;
863 ret = init_receivers();
864 if (ret < 0)
865 return ret;
866 ret = init_filters();
867 if (ret < 0)
868 return ret;
869 return 1;
870 }
871
872 static int audiod_get_socket(void)
873 {
874 struct sockaddr_un unix_addr;
875 int fd;
876
877 if (conf.socket_given)
878 socket_name = para_strdup(conf.socket_arg);
879 else {
880 char *hn = para_hostname();
881 socket_name = make_message("/var/paraslash/audiod_socket.%s",
882 hn);
883 free(hn);
884 }
885 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
886 if (conf.force_given)
887 unlink(socket_name);
888 fd = create_pf_socket(socket_name, &unix_addr,
889 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
890 if (fd < 0) {
891 PARA_EMERG_LOG("%s", "can not connect to socket\n");
892 exit(EXIT_FAILURE); /* do not unlink socket */
893 }
894 if (listen(fd , 5) < 0) {
895 PARA_EMERG_LOG("%s", "can not listen on socket\n");
896 exit(EXIT_FAILURE); /* do not unlink socket */
897 }
898 mark_fd_nonblock(fd);
899 return fd;
900 }
901
902 static void signal_event_handler(struct task *t)
903 {
904 struct signal_task *st = t->private_data;
905
906 switch (st->signum) {
907 case SIGINT:
908 case SIGTERM:
909 case SIGHUP:
910 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
911 clean_exit(EXIT_FAILURE, "caught deadly signal");
912 }
913 }
914
915 static void signal_pre_select(struct sched *s, struct task *t)
916 {
917 struct signal_task *st = t->private_data;
918 t->ret = 1;
919 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
920 }
921
922 static void signal_post_select(struct sched *s, struct task *t)
923 {
924 struct signal_task *st = t->private_data;
925 t->ret = 1;
926 if (!FD_ISSET(st->fd, &s->rfds))
927 return;
928 t->ret = -E_SIGNAL_CAUGHT;
929 st->signum = para_next_signal();
930 }
931
932 static void signal_setup_default(struct signal_task *st)
933 {
934 st->task.pre_select = signal_pre_select;
935 st->task.post_select = signal_post_select;
936 st->task.private_data = st;
937 sprintf(st->task.status, "signal task");
938 }
939
940 static void command_pre_select(struct sched *s, struct task *t)
941 {
942 struct command_task *ct = t->private_data;
943 t->ret = 1;
944 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
945
946 }
947
948 static void command_post_select(struct sched *s, struct task *t)
949 {
950 int ret;
951 struct command_task *ct = t->private_data;
952
953 t->ret = 1; /* always successful */
954 audiod_status_dump();
955 if (!FD_ISSET(ct->fd, &s->rfds))
956 return;
957 ret = handle_connect(ct->fd);
958 if (ret < 0)
959 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
960 }
961
962 static void init_command_task(struct command_task *ct)
963 {
964 ct->task.pre_select = command_pre_select;
965 ct->task.post_select = command_post_select;
966 ct->task.event_handler = NULL;
967 ct->task.private_data = ct;
968 ct->fd = audiod_get_socket(); /* doesn't return on errors */
969 sprintf(ct->task.status, "command task");
970 }
971
972 static void client_task_event_handler(__a_unused struct task *t)
973 {
974 struct private_client_data *pcd = t->private_data;
975 int i;
976 struct timeval delay = {1, 0};
977
978 if (t->ret == -E_HANDSHAKE_COMPLETE)
979 return;
980 unregister_task(t);
981 close_stat_pipe();
982 if (t->ret != -E_SERVER_EOF)
983 stat_task->clock_diff_count = conf.clock_diff_count_arg;
984 /* avoid busy loop if server is down */
985 tv_add(now, &delay, &stat_task->restart_barrier);
986 FOR_EACH_AUDIO_FORMAT(i)
987 afi[i].restart_barrier = stat_task->restart_barrier;
988 }
989
990 static void status_pre_select(struct sched *s, struct task *t)
991 {
992 struct status_task *st = t->private_data;
993 int ret;
994
995 t->ret = 1; /* always successful */
996 if (st->pcd || audiod_status == AUDIOD_OFF)
997 return;
998 if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
999 < 0)
1000 return;
1001 if (st->clock_diff_count) {
1002 char *argv[] = {"audiod", "stat", "1", NULL};
1003 int argc = 3;
1004 if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
1005 return;
1006 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1007 ret = client_open(argc, argv, &st->pcd);
1008
1009 } else {
1010 char *argv[] = {"audiod", "stat", NULL};
1011 int argc = 2;
1012 ret = client_open(argc, argv, &st->pcd);
1013 }
1014 if (ret < 0)
1015 return;
1016 st->pcd->task.event_handler = client_task_event_handler;
1017 s->timeout.tv_sec = 0;
1018 s->timeout.tv_usec = 1;
1019 }
1020
1021 static void status_post_select(__a_unused struct sched *s, struct task *t)
1022 {
1023 struct status_task *st = t->private_data;
1024 unsigned bytes_left;
1025
1026 t->ret = 1;
1027 if (!st->pcd || st->pcd->status != CL_RECEIVING)
1028 return;
1029 if (st->pcd && audiod_status == AUDIOD_OFF) {
1030 unregister_task(&st->pcd->task);
1031 close_stat_pipe();
1032 st->clock_diff_count = conf.clock_diff_count_arg;
1033 return;
1034 }
1035 bytes_left = for_each_line(st->pcd->buf, st->pcd->loaded,
1036 &check_stat_line);
1037 if (st->pcd->loaded != bytes_left) {
1038 st->last_status_read = *now;
1039 st->pcd->loaded = bytes_left;
1040 } else {
1041 struct timeval diff;
1042 tv_diff(now, &st->last_status_read, &diff);
1043 if (diff.tv_sec > 61)
1044 close_stat_pipe();
1045 }
1046 }
1047
1048 static void init_status_task(struct status_task *st)
1049 {
1050 memset(st, 0, sizeof(struct status_task));
1051 st->task.pre_select = status_pre_select;
1052 st->task.post_select = status_post_select;
1053 st->task.private_data = st;
1054 st->sa_time_diff_sign = 1;
1055 st->clock_diff_count = conf.clock_diff_count_arg;
1056 sprintf(st->task.status, "status task");
1057 }
1058
1059 static void set_initial_status(void)
1060 {
1061 audiod_status = AUDIOD_ON;
1062 if (!conf.mode_given)
1063 return;
1064 if (!strcmp(conf.mode_arg, "sb")) {
1065 audiod_status = AUDIOD_STANDBY;
1066 return;
1067 }
1068 if (!strcmp(conf.mode_arg, "off")) {
1069 audiod_status = AUDIOD_OFF;
1070 return;
1071 }
1072 if (strcmp(conf.mode_arg, "on"))
1073 PARA_WARNING_LOG("%s", "invalid mode\n");
1074 }
1075
1076 int main(int argc, char *argv[])
1077 {
1078 char *cf;
1079 int ret, i;
1080 struct sched s;
1081 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1082 struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1083
1084 valid_fd_012();
1085 audiod_cmdline_parser(argc, argv, &conf);
1086 HANDLE_VERSION_FLAG("audiod", conf);
1087 para_drop_privileges(conf.user_arg, conf.group_arg);
1088 cf = configfile_exists();
1089 if (cf) {
1090 if (audiod_cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1091 PARA_EMERG_LOG("%s", "parse error in config file\n");
1092 exit(EXIT_FAILURE);
1093 }
1094 }
1095 if (conf.logfile_given)
1096 logfile = open_log(conf.logfile_arg);
1097 log_welcome("para_audiod", conf.loglevel_arg);
1098 i = init_stream_io();
1099 if (i < 0) {
1100 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1101 exit(EXIT_FAILURE);
1102 }
1103 server_uptime(UPTIME_SET);
1104 set_initial_status();
1105 FOR_EACH_SLOT(i)
1106 clear_slot(i);
1107 init_grabbing();
1108 setup_signal_handling();
1109 signal_setup_default(sig_task);
1110 sig_task->task.event_handler = signal_event_handler;
1111
1112 init_status_task(stat_task);
1113 init_command_task(cmd_task);
1114 init_audiod_task(audiod_task);
1115
1116 if (conf.daemon_given)
1117 daemon_init();
1118
1119 register_task(&sig_task->task);
1120 register_task(&cmd_task->task);
1121 register_task(&stat_task->task);
1122 register_task(audiod_task);
1123 s.default_timeout.tv_sec = 0;
1124 s.default_timeout.tv_usec = 99 * 1000;
1125 ret = sched(&s);
1126
1127 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1128 return EXIT_FAILURE;
1129 }