add documentation of struct signal_task
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2006 Andre Noll <noll@mathematik.tu-darmstadt.de>
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
41 /** define the array of error lists needed by para_audiod */
42 INIT_AUDIOD_ERRLISTS;
43 /** define the array containing all supported audio formats */
44 DEFINE_AUDIO_FORMAT_ARRAY;
45
46 /** defines how to handle one supported audio format */
47 struct audio_format_info {
48 /** pointer to the receiver for this audio format */
49 struct receiver *receiver;
50 /** the receiver configuration */
51 void *receiver_conf;
52 /** the number of filters that should be activated for this audio format */
53 unsigned int num_filters;
54 /** pointer to the array of filters to be activated */
55 struct filter **filters;
56 /** pointer to the array of filter configurations */
57 void **filter_conf;
58 /** the number of filters that should be activated for this audio format */
59 unsigned int num_writers;
60 /** pointer to the array of writers to be activated */
61 struct writer **writers;
62 /** pointer to the array of writer configurations */
63 void **writer_conf;
64 /** do not start receiver/filters/writer before this time */
65 struct timeval restart_barrier;
66 };
67
68 struct slot_info slot[MAX_STREAM_SLOTS];
69
70
71 int audiod_status = AUDIOD_ON;
72
73 struct audiod_args_info conf;
74 static char *socket_name;
75 static FILE *logfile;
76 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
77
78 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
79
80 static struct status_task status_task_struct;
81 struct status_task *stat_task = &status_task_struct;
82
83 /**
84 * the task for handling audiod commands
85 *
86 * \sa struct task, struct sched
87 */
88 struct command_task {
89 /** the local listening socket */
90 int fd;
91 /** the associated task structure */
92 struct task task;
93 };
94
95 /**
96 * task for signal handling
97 */
98 struct signal_task {
99 /** the signal pipe */
100 int fd;
101 /** the number of the most recent signal */
102 int signum;
103 /** the associated task structure */
104 struct task task;
105 };
106
107 /** iterate over all supported audio formats */
108 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
109
110 /**
111 * get the audio format number
112 * \param name the name of the audio format
113 *
114 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
115 * \a name is not a supported audio format.
116 */
117 int get_audio_format_num(char *name)
118 {
119 int i;
120 FOR_EACH_AUDIO_FORMAT(i)
121 if (!strcmp(name, audio_formats[i]))
122 return i;
123 return -E_UNSUPPORTED_AUDIO_FORMAT;
124 }
125
126 /*
127 * log function. first argument is loglevel.
128 */
129 void para_log(int ll, const char* fmt,...)
130 {
131 va_list argp;
132 FILE *outfd;
133 struct tm *tm;
134 time_t t1;
135 char str[MAXLINE] = "";
136 static char *hostname;
137
138 if (ll < conf.loglevel_arg)
139 return;
140 if (!hostname)
141 hostname = para_hostname();
142 outfd = logfile? logfile : stderr;
143 time(&t1);
144 tm = localtime(&t1);
145 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
146 fprintf(outfd, "%s %s ", str, hostname);
147 if (conf.loglevel_arg <= INFO)
148 fprintf(outfd, "%i ", ll);
149 va_start(argp, fmt);
150 vfprintf(outfd, fmt, argp);
151 va_end(argp);
152 }
153
154 static char *configfile_exists(void)
155 {
156 static char *config_file;
157
158 if (!config_file) {
159 char *home = para_homedir();
160 config_file = make_message("%s/.paraslash/audiod.conf", home);
161 free(home);
162 }
163 return file_exists(config_file)? config_file : NULL;
164 }
165
166 static void setup_signal_handling(void)
167 {
168 sig_task->fd = para_signal_init();
169 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
170 para_install_sighandler(SIGINT);
171 para_install_sighandler(SIGTERM);
172 para_install_sighandler(SIGHUP);
173 signal(SIGPIPE, SIG_IGN);
174 }
175
176 static void clear_slot(int slot_num)
177 {
178 struct slot_info *s = &slot[slot_num];
179
180 PARA_INFO_LOG("clearing slot %d\n", slot_num);
181 memset(s, 0, sizeof(struct slot_info));
182 s->format = -1;
183 }
184
185 static void close_receiver(int slot_num)
186 {
187 struct slot_info *s = &slot[slot_num];
188 struct audio_format_info *a;
189 const struct timeval restart_delay = {0, 200 * 1000};
190
191 if (s->format < 0 || !s->receiver_node)
192 return;
193 a = &afi[s->format];
194 PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
195 audio_formats[s->format] , slot_num, s->receiver_node->eof);
196 // if (!s->receiver_node->eof)
197 // unregister_task(&s->receiver_node->task);
198 a->receiver->close(s->receiver_node);
199 free(s->receiver_node);
200 s->receiver_node = NULL;
201 /* set restart barrier */
202 tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
203 }
204
205 static void kill_all_decoders(void)
206 {
207 int i;
208
209 FOR_EACH_SLOT(i) {
210 struct slot_info *s = &slot[i];
211 if (s->wng && !s->wng->eof) {
212 PARA_INFO_LOG("unregistering writer node group in slot %d\n",
213 i);
214 wng_unregister(s->wng);
215 s->wng->eof = 1;
216 }
217 if (s->fc && !s->fc->eof) {
218 PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
219 unregister_task(&s->fc->task);
220 s->fc->eof = 1;
221 }
222 if (s->receiver_node && !s->receiver_node->eof) {
223 PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
224 unregister_task(&s->receiver_node->task);
225 s->receiver_node->eof = 1;
226 }
227 }
228 }
229
230 static int get_empty_slot(void)
231 {
232 int i;
233 struct slot_info *s;
234
235 FOR_EACH_SLOT(i) {
236 s = &slot[i];
237 if (s->format < 0) {
238 clear_slot(i);
239 return i;
240 }
241 if (s->wng || s->receiver_node || s->fc)
242 continue;
243 clear_slot(i);
244 return i;
245 }
246 return -E_NO_MORE_SLOTS;
247 }
248
249 static int decoder_running(int format)
250 {
251 int i, ret = 0;
252 struct slot_info *s;
253
254 FOR_EACH_SLOT(i) {
255 s = &slot[i];
256 if (s->format == format && s->receiver_node)
257 ret |= 1;
258 if (s->format == format && s->wng)
259 ret |= 2;
260 }
261 return ret;
262 }
263
264 static void close_stat_pipe(void)
265 {
266 int i;
267
268 if (!stat_task->pcd)
269 return;
270 client_close(stat_task->pcd);
271 stat_task->pcd = NULL;
272 for (i = 0; i < NUM_STAT_ITEMS; i++) {
273 free(stat_task->stat_item_values[i]);
274 stat_task->stat_item_values[i] = NULL;
275 }
276 dump_empty_status();
277 stat_task->length_seconds = 0;
278 stat_task->offset_seconds = 0;
279 audiod_status_dump();
280 stat_task->playing = 0;
281 stat_task->stat_item_values[SI_STATUS_BAR] = make_message(
282 "%s:no connection to para_server\n",
283 status_item_list[SI_STATUS_BAR]);
284 stat_client_write(stat_task->stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
285 }
286
287 void __noreturn clean_exit(int status, const char *msg)
288 {
289 PARA_EMERG_LOG("%s\n", msg);
290 if (socket_name)
291 unlink(socket_name);
292 close_stat_pipe();
293 exit(status);
294 }
295
296 /**
297 * get the number of filters
298 *
299 * \param audio_format_num the number identifying the audio format
300 *
301 * \return the number of filters for the given audio format
302 *
303 * \sa struct filter;
304 */
305 int num_filters(int audio_format_num)
306 {
307 return afi[audio_format_num].num_filters;
308 }
309
310 static void filter_event_handler(struct task *t)
311 {
312 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
313 struct filter_chain *fc = t->private_data;
314 fc->eof = 1;
315 unregister_task(t);
316 }
317
318 static void open_filters(int slot_num)
319 {
320 struct slot_info *s = &slot[slot_num];
321 struct audio_format_info *a = &afi[s->format];
322 int nf = a->num_filters;
323 int i;
324
325 s->fc = NULL;
326 if (!nf)
327 return;
328 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
329 s->fc = para_calloc(sizeof(struct filter_chain));
330 INIT_LIST_HEAD(&s->fc->filters);
331 s->fc->inbuf = s->receiver_node->buf;
332 s->fc->in_loaded = &s->receiver_node->loaded;
333 s->fc->input_eof = &s->receiver_node->eof;
334 s->fc->task.pre_select = filter_pre_select;
335 s->fc->task.event_handler = filter_event_handler;
336 s->fc->task.private_data = s->fc;
337 s->fc->eof = 0;
338
339 s->receiver_node->output_eof = &s->fc->eof;
340 sprintf(s->fc->task.status, "filter chain");
341 for (i = 0; i < nf; i++) {
342 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
343 fn->conf = a->filter_conf[i];
344 fn->fc = s->fc;
345 fn->filter = a->filters[i];
346 INIT_LIST_HEAD(&fn->callbacks);
347 list_add_tail(&fn->node, &s->fc->filters);
348 fn->filter->open(fn);
349 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
350 audio_formats[s->format], i + 1, nf,
351 fn->filter->name, slot_num);
352 s->fc->outbuf = fn->buf;
353 s->fc->out_loaded = &fn->loaded;
354 }
355 register_task(&s->fc->task);
356 }
357
358 static void wng_event_handler(struct task *t)
359 {
360 struct writer_node_group *wng = t->private_data;
361
362 PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
363 wng->eof = 1;
364 wng_unregister(wng);
365 }
366
367 static void open_writers(int slot_num)
368 {
369 int ret, i;
370 struct slot_info *s = &slot[slot_num];
371 struct audio_format_info *a = &afi[s->format];
372
373 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
374 if (!a->num_writers)
375 s->wng = setup_default_wng();
376 else
377 s->wng = wng_new(a->num_writers);
378 if (s->fc) {
379 s->wng->buf = s->fc->outbuf;
380 s->wng->loaded = s->fc->out_loaded;
381 s->wng->input_eof = &s->fc->eof;
382 s->wng->channels = &s->fc->channels;
383 s->wng->samplerate = &s->fc->samplerate;
384 s->fc->output_eof = &s->wng->eof;
385 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
386 } else {
387 s->wng->buf = s->receiver_node->buf;
388 s->wng->loaded = &s->receiver_node->loaded;
389 s->wng->input_eof = &s->receiver_node->eof;
390 }
391 s->wng->task.event_handler = wng_event_handler;
392 for (i = 0; i < a->num_writers; i++) {
393 s->wng->writer_nodes[i].conf = a->writer_conf[i];
394 s->wng->writer_nodes[i].writer = a->writers[i];
395 }
396 ret = wng_open(s->wng);
397 if (ret < 0) {
398 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
399 return;
400 }
401 s->wstime = *now;
402 activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
403 }
404
405 static void rn_event_handler(struct task *t)
406 {
407 struct receiver_node *rn = t->private_data;
408
409 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
410 unregister_task(t);
411 rn->eof = 1;
412 }
413
414 static void open_receiver(int format)
415 {
416 struct audio_format_info *a = &afi[format];
417 struct slot_info *s;
418 int ret, slot_num;
419 struct receiver_node *rn;
420
421 slot_num = get_empty_slot();
422 if (slot_num < 0)
423 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
424 s = &slot[slot_num];
425 s->format = format;
426 s->receiver_node = para_calloc(sizeof(struct receiver_node));
427 rn = s->receiver_node;
428 rn->receiver = a->receiver;
429 rn->conf = a->receiver_conf;
430 ret = a->receiver->open(s->receiver_node);
431 if (ret < 0) {
432 PARA_ERROR_LOG("failed to open receiver (%s)\n",
433 PARA_STRERROR(-ret));
434 free(s->receiver_node);
435 s->receiver_node = NULL;
436 return;
437 }
438 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
439 audio_formats[s->format], a->receiver->name, slot_num);
440 rn->task.private_data = s->receiver_node;
441 rn->task.pre_select = a->receiver->pre_select;
442 rn->task.post_select = a->receiver->post_select;
443 rn->task.event_handler = rn_event_handler;
444 sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
445 register_task(&rn->task);
446 }
447
448 static int open_current_receiver(struct sched *s)
449 {
450 int i;
451 struct timeval diff;
452
453 if (!stat_task->af_status || !stat_task->pcd)
454 return 0;
455 i = get_audio_format_num(stat_task->af_status);
456 if (i < 0)
457 return 0;
458 if (decoder_running(i))
459 return 0;
460 if (tv_diff(now, &afi[i].restart_barrier, &diff) < 0) {
461 s->timeout = diff;
462 return 0;
463 }
464 open_receiver(i);
465 return 1;
466 }
467
468 static void compute_time_diff(const struct timeval *status_time)
469 {
470 struct timeval tmp, diff;
471 static int count;
472 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
473 const struct timeval max_deviation = {0, 500 * 1000};
474 const int time_smooth = 5;
475
476 sign = tv_diff(status_time, now, &diff);
477 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
478 // sign, sa_time_diff_sign);
479 if (!count) {
480 sa_time_diff_sign = sign;
481 stat_task->sa_time_diff = diff;
482 count++;
483 return;
484 }
485 if (count > 5) {
486 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
487 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
488 PARA_WARNING_LOG("time diff jump: %lims\n",
489 s * tv2ms(&tmp));
490 }
491 count++;
492 sa_time_diff_sign = tv_convex_combination(
493 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
494 count > 10? sign : sign * time_smooth, &diff,
495 &tmp);
496 stat_task->sa_time_diff = tmp;
497 PARA_DEBUG_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
498 sign > 0? "+" : "-",
499 tv2ms(&diff),
500 sa_time_diff_sign ? "+" : "-",
501 tv2ms(&stat_task->sa_time_diff)
502 );
503 }
504
505 static void check_stat_line(char *line)
506 {
507 int itemnum;
508 size_t ilen = 0;
509 long unsigned sec, usec;
510 char *tmp;
511
512 // PARA_INFO_LOG("line: %s\n", line);
513 if (!line)
514 return;
515 itemnum = stat_line_valid(line);
516 if (itemnum < 0) {
517 PARA_WARNING_LOG("invalid status line: %s\n", line);
518 return;
519 }
520 tmp = make_message("%s\n", line);
521 stat_client_write(tmp, itemnum);
522 free(tmp);
523 free(stat_task->stat_item_values[itemnum]);
524 stat_task->stat_item_values[itemnum] = para_strdup(line);
525 ilen = strlen(status_item_list[itemnum]);
526 switch (itemnum) {
527 case SI_STATUS:
528 stat_task->playing = strstr(line, "playing")? 1 : 0;
529 break;
530 case SI_FORMAT:
531 free(stat_task->af_status);
532 stat_task->af_status = para_strdup(line + ilen + 1);
533 break;
534 case SI_OFFSET:
535 stat_task->offset_seconds = atoi(line + ilen + 1);
536 break;
537 case SI_LENGTH:
538 stat_task->length_seconds = atoi(line + ilen + 1);
539 break;
540 case SI_STREAM_START:
541 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
542 stat_task->server_stream_start.tv_sec = sec;
543 stat_task->server_stream_start.tv_usec = usec;
544 }
545 break;
546 case SI_CURRENT_TIME:
547 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
548 struct timeval tv = {sec, usec};
549 compute_time_diff(&tv);
550 }
551 break;
552 }
553 }
554
555 static void handle_signal(int sig)
556 {
557 switch (sig) {
558 case SIGINT:
559 case SIGTERM:
560 case SIGHUP:
561 PARA_EMERG_LOG("terminating on signal %d\n", sig);
562 clean_exit(EXIT_FAILURE, "caught deadly signal");
563 return;
564 }
565 }
566
567 static void try_to_close_slot(int slot_num)
568 {
569 struct slot_info *s = &slot[slot_num];
570
571 if (s->format < 0)
572 return;
573 if (s->receiver_node && !s->receiver_node->eof)
574 return;
575 if (s->fc && !s->fc->eof)
576 return;
577 if (s->wng && !s->wng->eof)
578 return;
579 PARA_INFO_LOG("closing slot %d \n", slot_num);
580 wng_close(s->wng);
581 close_filters(s->fc);
582 free(s->fc);
583 close_receiver(slot_num);
584 clear_slot(slot_num);
585 }
586
587 /*
588 * Check if any receivers/filters/writers need to be started and do so if
589 * neccessary. Since the pre_select function didn't have a chance yet to put
590 * file descriptors into the fd sets given by s, make the upcoming select()
591 * return immediately to avoid a long timeout in case we started something.
592 */
593 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
594 {
595 int i;
596 struct timeval min_delay = {0, 1};
597
598 t->ret = 1;
599 if (audiod_status != AUDIOD_ON || !stat_task->playing)
600 return kill_all_decoders();
601 if (open_current_receiver(s))
602 s->timeout = min_delay;
603 FOR_EACH_SLOT(i) {
604 struct slot_info *sl = &slot[i];
605 struct audio_format_info *a;
606
607 if (sl->format < 0)
608 continue;
609 a = &afi[sl->format];
610 if (!sl->receiver_node)
611 continue;
612 if (!a->num_filters) {
613 if (sl->receiver_node->loaded && !sl->wng) {
614 open_writers(i);
615 s->timeout = min_delay;
616 }
617 continue;
618 }
619 if (sl->receiver_node->loaded && !sl->fc) {
620 open_filters(i);
621 s->timeout = min_delay;
622 continue;
623 }
624 if (sl->fc && *sl->fc->out_loaded && !sl->wng) {
625 open_writers(i);
626 s->timeout = min_delay;
627 }
628 }
629 }
630
631 static void audiod_post_select(__a_unused struct sched *s,
632 __a_unused struct task *t)
633 {
634 int i;
635
636 /* save away the current time for other users */
637 t->ret = 1;
638 FOR_EACH_SLOT(i)
639 try_to_close_slot(i);
640 }
641
642 static void init_audiod_task(struct task *t)
643 {
644 t->pre_select = audiod_pre_select;
645 t->post_select = audiod_post_select;
646 t->event_handler = NULL;
647 t->private_data = t;
648 sprintf(t->status, "audiod task");
649 }
650
651 static int parse_stream_command(const char *txt, char **cmd)
652 {
653 char *p = strchr(txt, ':');
654 int i;
655
656 if (!p)
657 return -E_MISSING_COLON;
658 p++;
659 FOR_EACH_AUDIO_FORMAT(i) {
660 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
661 continue;
662 *cmd = p;
663 return i;
664 }
665 return -E_UNSUPPORTED_AUDIO_FORMAT;
666 }
667
668 static int add_filter(int format, char *cmdline)
669 {
670 struct audio_format_info *a = &afi[format];
671 int filter_num, nf = a->num_filters;
672
673 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
674 if (filter_num < 0)
675 return filter_num;
676 a->filters[nf] = &filters[filter_num];
677 a->num_filters++;
678 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
679 a->filters[nf]->name);
680 return filter_num;
681 }
682
683 static int init_writers(void)
684 {
685 int i, ret, nw;
686 char *cmd;
687 struct audio_format_info *a;
688
689 init_supported_writers();
690 nw = PARA_MAX(1, conf.writer_given);
691 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
692 FOR_EACH_AUDIO_FORMAT(i) {
693 a = &afi[i];
694 a->writer_conf = para_malloc(nw * sizeof(void *));
695 a->writers = para_malloc(nw * sizeof(struct writer *));
696 a->num_writers = 0;
697 }
698 for (i = 0; i < conf.writer_given; i++) {
699 void *wconf;
700 int writer_num;
701 ret = parse_stream_command(conf.writer_arg[i], &cmd);
702 if (ret < 0)
703 goto out;
704 a = &afi[ret];
705 nw = a->num_writers;
706 wconf = check_writer_arg(cmd, &writer_num);
707 if (!wconf) {
708 ret = writer_num;
709 goto out;
710 }
711 a->writers[nw] = &writers[writer_num];
712 a->writer_conf[nw] = wconf;
713 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
714 nw, writer_names[writer_num]);
715 a->num_writers++;
716 }
717 ret = 1;
718 out:
719 return ret;
720 }
721
722 static int init_receivers(void)
723 {
724 int i, ret, receiver_num;
725 char *cmd = NULL;
726 struct audio_format_info *a;
727
728 for (i = 0; receivers[i].name; i++) {
729 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
730 receivers[i].init(&receivers[i]);
731 }
732 for (i = 0; i < conf.receiver_given; i++) {
733 char *arg = conf.receiver_arg[i];
734 char *recv = strchr(arg, ':');
735 ret = -E_MISSING_COLON;
736 if (!recv)
737 goto out;
738 *recv = '\0';
739 recv++;
740 ret = get_audio_format_num(arg);
741 if (ret < 0)
742 goto out;
743 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
744 if (!afi[ret].receiver_conf) {
745 ret = -E_RECV_SYNTAX;
746 goto out;
747 }
748 afi[ret].receiver = &receivers[receiver_num];
749 }
750 /* use the first available receiver with no arguments
751 * for those audio formats for which no receiver
752 * was specified
753 */
754 cmd = para_strdup(receivers[0].name);
755 FOR_EACH_AUDIO_FORMAT(i) {
756 a = &afi[i];
757 if (a->receiver_conf)
758 continue;
759 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
760 if (!a->receiver_conf)
761 return -E_RECV_SYNTAX;
762 a->receiver = &receivers[receiver_num];
763 }
764 ret = 1;
765 out:
766 free(cmd);
767 return ret;
768 }
769
770 static int init_default_filters(void)
771 {
772 int i, ret = 1;
773
774 FOR_EACH_AUDIO_FORMAT(i) {
775 struct audio_format_info *a = &afi[i];
776 char *tmp;
777 int j;
778
779 if (a->num_filters)
780 continue; /* no default -- nothing to to */
781 /* add "dec" to audio format name */
782 tmp = make_message("%sdec", audio_formats[i]);
783 for (j = 0; filters[j].name; j++)
784 if (!strcmp(tmp, filters[j].name))
785 break;
786 free(tmp);
787 ret = -E_UNSUPPORTED_FILTER;
788 if (!filters[j].name)
789 goto out;
790 tmp = para_strdup(filters[j].name);
791 ret = add_filter(i, tmp);
792 free(tmp);
793 if (ret < 0)
794 goto out;
795 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
796 filters[j].name);
797 }
798 out:
799 return ret;
800 }
801
802 static int init_filters(void)
803 {
804 int i, ret, nf;
805
806 filter_init(filters);
807 nf = PARA_MAX(1, conf.filter_given);
808 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
809 FOR_EACH_AUDIO_FORMAT(i) {
810 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
811 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
812 }
813 if (!conf.no_default_filters_given)
814 return init_default_filters();
815 for (i = 0; i < conf.filter_given; i++) {
816 char *arg = conf.filter_arg[i];
817 char *filter_name = strchr(arg, ':');
818 ret = -E_MISSING_COLON;
819 if (!filter_name)
820 goto out;
821 *filter_name = '\0';
822 filter_name++;
823 ret = get_audio_format_num(arg);
824 if (ret < 0)
825 goto out;
826 ret = add_filter(ret, filter_name);
827 if (ret < 0)
828 goto out;
829 }
830 ret = init_default_filters(); /* use default values for the rest */
831 out:
832 return ret;
833 }
834
835 static int init_stream_io(void)
836 {
837 int ret;
838
839 ret = init_writers();
840 if (ret < 0)
841 return ret;
842 ret = init_receivers();
843 if (ret < 0)
844 return ret;
845 ret = init_filters();
846 if (ret < 0)
847 return ret;
848 return 1;
849 }
850
851 static int audiod_get_socket(void)
852 {
853 struct sockaddr_un unix_addr;
854 int fd;
855
856 if (conf.socket_given)
857 socket_name = para_strdup(conf.socket_arg);
858 else {
859 char *hn = para_hostname();
860 socket_name = make_message("/var/paraslash/audiod_socket.%s",
861 hn);
862 free(hn);
863 }
864 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
865 if (conf.force_given)
866 unlink(socket_name);
867 fd = create_pf_socket(socket_name, &unix_addr,
868 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
869 if (fd < 0) {
870 PARA_EMERG_LOG("%s", "can not connect to socket\n");
871 exit(EXIT_FAILURE); /* do not unlink socket */
872 }
873 if (listen(fd , 5) < 0) {
874 PARA_EMERG_LOG("%s", "can not listen on socket\n");
875 exit(EXIT_FAILURE); /* do not unlink socket */
876 }
877 mark_fd_nonblock(fd);
878 return fd;
879 }
880
881 static void signal_event_handler(struct task *t)
882 {
883 struct signal_task *st = t->private_data;
884
885 if (t->ret != -E_SIGNAL_CAUGHT)
886 PARA_ERROR_LOG("%s (ignored)\n", PARA_STRERROR(-t->ret));
887 else
888 handle_signal(st->signum);
889 }
890
891 static void signal_pre_select(struct sched *s, struct task *t)
892 {
893 struct signal_task *st = t->private_data;
894 t->ret = 1;
895 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
896 }
897
898 static void signal_post_select(struct sched *s, struct task *t)
899 {
900 struct signal_task *st = t->private_data;
901 t->ret = 1;
902 if (!FD_ISSET(st->fd, &s->rfds))
903 return;
904 t->ret = -E_SIGNAL_CAUGHT;
905 st->signum = para_next_signal();
906 }
907
908 static void signal_setup_default(struct signal_task *st)
909 {
910 st->task.pre_select = signal_pre_select;
911 st->task.post_select = signal_post_select;
912 st->task.private_data = st;
913 sprintf(st->task.status, "signal task");
914 }
915
916 static void command_pre_select(struct sched *s, struct task *t)
917 {
918 struct command_task *ct = t->private_data;
919 t->ret = 1;
920 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
921
922 }
923
924 static void command_post_select(struct sched *s, struct task *t)
925 {
926 int ret;
927 struct command_task *ct = t->private_data;
928
929 t->ret = 1; /* always successful */
930 if (audiod_status != AUDIOD_OFF)
931 audiod_status_dump();
932 if (!FD_ISSET(ct->fd, &s->rfds))
933 return;
934 ret = handle_connect(ct->fd);
935 if (ret < 0)
936 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
937 }
938
939 static void init_command_task(struct command_task *ct)
940 {
941 ct->task.pre_select = command_pre_select;
942 ct->task.post_select = command_post_select;
943 ct->task.event_handler = NULL;
944 ct->task.private_data = ct;
945 ct->fd = audiod_get_socket(); /* doesn't return on errors */
946 sprintf(ct->task.status, "command task");
947 }
948
949 static void client_task_event_handler(__a_unused struct task *t)
950 {
951 struct private_client_data *pcd = t->private_data;
952 if (t->ret == -E_HANDSHAKE_COMPLETE)
953 return;
954 unregister_task(t);
955 pcd->eof = 1;
956 }
957
958 static void status_event_handler(__a_unused struct task *t)
959 {
960 struct timeval delay = {1, 0};
961 int i;
962 struct status_task *st = t->private_data;
963
964 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-t->ret));
965 close_stat_pipe();
966 /* avoid busy loop if server is down */
967 tv_add(now, &delay, &st->restart_barrier);
968 FOR_EACH_AUDIO_FORMAT(i)
969 afi[i].restart_barrier = st->restart_barrier;
970 }
971
972 static void status_pre_select(struct sched *s, struct task *t)
973 {
974 struct status_task *st = t->private_data;
975 int argc = 2;
976 char *argv[] = {"audiod", "stat", NULL};
977 t->ret = 1;
978 if (st->pcd && (audiod_status == AUDIOD_OFF || st->pcd->eof))
979 close_stat_pipe();
980 if (!st->pcd && audiod_status != AUDIOD_OFF
981 && tv_diff(now, &st->restart_barrier, NULL) > 0) {
982 t->ret = client_parse_config(argc, argv, &st->pcd);
983 if (t->ret < 0)
984 return;
985 t->ret = client_open(st->pcd);
986 if (t->ret < 0)
987 return;
988 st->pcd->task.event_handler = client_task_event_handler;
989 s->timeout.tv_sec = 0;
990 s->timeout.tv_usec = 1;
991 }
992 }
993
994 static void status_post_select(__a_unused struct sched *s, struct task *t)
995 {
996 struct status_task *st = t->private_data;
997
998 t->ret = 1;
999 if (!st->pcd || !st->pcd->loaded
1000 || st->pcd->status != CL_RECEIVING)
1001 return;
1002 st->pcd->loaded = for_each_line(st->pcd->buf, st->pcd->loaded,
1003 &check_stat_line);
1004 }
1005
1006 static void init_status_task(struct status_task *st)
1007 {
1008 memset(st, 0, sizeof(struct status_task));
1009 st->task.pre_select = status_pre_select;
1010 st->task.post_select = status_post_select;
1011 st->task.event_handler = status_event_handler;
1012 st->task.private_data = st;
1013 st->sa_time_diff_sign = 1;
1014 sprintf(st->task.status, "status task");
1015 }
1016
1017 static void set_initial_status(void)
1018 {
1019 audiod_status = AUDIOD_ON;
1020 if (!conf.mode_given)
1021 return;
1022 if (!strcmp(conf.mode_arg, "sb")) {
1023 audiod_status = AUDIOD_STANDBY;
1024 return;
1025 }
1026 if (!strcmp(conf.mode_arg, "off")) {
1027 audiod_status = AUDIOD_OFF;
1028 return;
1029 }
1030 if (strcmp(conf.mode_arg, "on"))
1031 PARA_WARNING_LOG("%s", "invalid mode\n");
1032 }
1033
1034 int main(int argc, char *argv[])
1035 {
1036 char *cf;
1037 int ret, i;
1038 struct sched s;
1039 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1040 struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1041
1042 valid_fd_012();
1043 audiod_cmdline_parser(argc, argv, &conf);
1044 para_drop_privileges(conf.user_arg, conf.group_arg);
1045 cf = configfile_exists();
1046 if (cf) {
1047 if (audiod_cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1048 PARA_EMERG_LOG("%s", "parse error in config file\n");
1049 exit(EXIT_FAILURE);
1050 }
1051 }
1052 if (conf.logfile_given)
1053 logfile = open_log(conf.logfile_arg);
1054 log_welcome("para_audiod", conf.loglevel_arg);
1055 i = init_stream_io();
1056 if (i < 0) {
1057 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1058 exit(EXIT_FAILURE);
1059 }
1060 server_uptime(UPTIME_SET);
1061 set_initial_status();
1062 FOR_EACH_SLOT(i)
1063 clear_slot(i);
1064 init_grabbing();
1065 setup_signal_handling();
1066 signal_setup_default(sig_task);
1067 sig_task->task.event_handler = signal_event_handler;
1068
1069 init_status_task(stat_task);
1070 init_command_task(cmd_task);
1071 init_audiod_task(audiod_task);
1072
1073 if (conf.daemon_given)
1074 daemon_init();
1075
1076 register_task(&sig_task->task);
1077 register_task(&cmd_task->task);
1078 register_task(&stat_task->task);
1079 register_task(audiod_task);
1080 s.default_timeout.tv_sec = 0;
1081 s.default_timeout.tv_usec = 99 * 1000;
1082 ret = sched(&s);
1083
1084 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1085 return EXIT_FAILURE;
1086 }