osl_core: Fix some typos in documentation.
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2008 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file audiod.c the paraslash's audio daemon */
8 #include <sys/types.h>
9 #include <dirent.h>
10
11 #include "para.h"
12 #include "error.h"
13 #include "audiod.cmdline.h"
14 #include "list.h"
15 #include "sched.h"
16 #include "recv.h"
17 #include "filter.h"
18 #include "grab_client.cmdline.h"
19 #include "grab_client.h"
20 #include "client.cmdline.h"
21 #include "client.h"
22 #include "audiod.h"
23 #include "net.h"
24 #include "daemon.h"
25 #include "string.h"
26 #include "fd.h"
27 #include "write.h"
28 #include "write_common.h"
29 #include "signal.h"
30
31 /** define the array of error lists needed by para_audiod */
32 INIT_AUDIOD_ERRLISTS;
33 /** define the array containing all supported audio formats */
34 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
35
36 /** Defines how audiod handles one supported audio format. */
37 struct audio_format_info {
38 /** pointer to the receiver for this audio format */
39 struct receiver *receiver;
40 /** the receiver configuration */
41 void *receiver_conf;
42 /** the number of filters that should be activated for this audio format */
43 unsigned int num_filters;
44 /** pointer to the array of filters to be activated */
45 struct filter **filters;
46 /** pointer to the array of filter configurations */
47 void **filter_conf;
48 /** the number of filters that should be activated for this audio format */
49 unsigned int num_writers;
50 /** pointer to the array of writers to be activated */
51 struct writer **writers;
52 /** pointer to the array of writer configurations */
53 void **writer_conf;
54 /** do not start receiver/filters/writer before this time */
55 struct timeval restart_barrier;
56 };
57
58 /**
59 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
60 * be associated with a receiver/filter/writer triple. This array holds all
61 * information on the status of these slots.
62 *
63 * \sa struct slot_info
64 * */
65 struct slot_info slot[MAX_STREAM_SLOTS];
66
67
68 /**
69 * the current mode of operation of which can be changed by the on/off/cycle
70 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
71 */
72 int audiod_status = AUDIOD_ON;
73
74 /**
75 * the gengetopt args_info struct that holds information on all command line
76 * arguments
77 */
78 struct audiod_args_info conf;
79
80 static char *socket_name;
81 static FILE *logfile;
82 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
83
84 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
85
86 static struct status_task status_task_struct;
87
88 /**
89 * the task that calls the status command of para_server
90 *
91 * \sa struct status_task
92 */
93 struct status_task *stat_task = &status_task_struct;
94 static struct timeval initial_delay_barrier;
95
96 /**
97 * the task for handling audiod commands
98 *
99 * \sa struct task, struct sched
100 */
101 struct command_task {
102 /** the local listening socket */
103 int fd;
104 /** the associated task structure */
105 struct task task;
106 };
107
108 /** iterate over all supported audio formats */
109 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
110
111 /**
112 * get the audio format number
113 * \param name the name of the audio format
114 *
115 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
116 * \a name is not a supported audio format.
117 */
118 int get_audio_format_num(char *name)
119 {
120 int i;
121
122 while (para_isspace(*name))
123 name++;
124 FOR_EACH_AUDIO_FORMAT(i)
125 if (!strcmp(name, audio_formats[i]))
126 return i;
127 return -E_UNSUPPORTED_AUDIO_FORMAT;
128 }
129
130 /**
131 * the log function of para_audiod
132 *
133 * \param ll loglevel
134 * \param fmt the format string
135 */
136 void para_log(int ll, const char* fmt,...)
137 {
138 va_list argp;
139 FILE *outfd;
140 struct tm *tm;
141 time_t t1;
142 char str[MAXLINE] = "";
143 static char *hostname;
144
145 if (ll < conf.loglevel_arg)
146 return;
147 if (!logfile && conf.daemon_given)
148 return;
149 if (!hostname)
150 hostname = para_hostname();
151 outfd = logfile? logfile : stderr;
152 time(&t1);
153 tm = localtime(&t1);
154 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
155 fprintf(outfd, "%s %s ", str, hostname);
156 if (conf.loglevel_arg <= INFO)
157 fprintf(outfd, "%i ", ll);
158 va_start(argp, fmt);
159 vfprintf(outfd, fmt, argp);
160 va_end(argp);
161 }
162
163 static char *configfile_exists(void)
164 {
165 char *home = para_homedir();
166 char *config_file = make_message("%s/.paraslash/audiod.conf",
167 home);
168 free(home);
169 if (file_exists(config_file))
170 return config_file;
171 free(config_file);
172 return NULL;
173 }
174
175 static void setup_signal_handling(void)
176 {
177 sig_task->fd = para_signal_init();
178 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
179 para_install_sighandler(SIGINT);
180 para_install_sighandler(SIGTERM);
181 para_install_sighandler(SIGHUP);
182 signal(SIGPIPE, SIG_IGN);
183 }
184
185 static void clear_slot(int slot_num)
186 {
187 struct slot_info *s = &slot[slot_num];
188
189 PARA_INFO_LOG("clearing slot %d\n", slot_num);
190 memset(s, 0, sizeof(struct slot_info));
191 s->format = -1;
192 }
193
194 static void close_receiver(int slot_num)
195 {
196 struct slot_info *s = &slot[slot_num];
197 struct audio_format_info *a;
198
199 if (s->format < 0 || !s->receiver_node)
200 return;
201 a = &afi[s->format];
202 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
203 audio_formats[s->format], slot_num);
204 a->receiver->close(s->receiver_node);
205 free(s->receiver_node);
206 s->receiver_node = NULL;
207 }
208
209 static void kill_all_decoders(int error)
210 {
211 int i;
212
213 FOR_EACH_SLOT(i) {
214 struct slot_info *s = &slot[i];
215 if (s->wng && !s->wng->error) {
216 PARA_INFO_LOG("unregistering writer node group in slot %d\n",
217 i);
218 wng_unregister(s->wng);
219 s->wng->error = error;
220 }
221 if (s->fc && !s->fc->error) {
222 PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
223 unregister_task(&s->fc->task);
224 s->fc->error = error;
225 }
226 if (s->receiver_node && !s->receiver_node->error) {
227 PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
228 unregister_task(&s->receiver_node->task);
229 s->receiver_node->error = error;
230 }
231 }
232 }
233
234 static int get_empty_slot(void)
235 {
236 int i;
237 struct slot_info *s;
238
239 FOR_EACH_SLOT(i) {
240 s = &slot[i];
241 if (s->format < 0) {
242 clear_slot(i);
243 return i;
244 }
245 if (s->wng || s->receiver_node || s->fc)
246 continue;
247 clear_slot(i);
248 return i;
249 }
250 return -E_NO_MORE_SLOTS;
251 }
252
253 /**
254 * get the number of filters
255 *
256 * \param audio_format_num the number identifying the audio format
257 *
258 * \return the number of filters for the given audio format
259 *
260 * \sa struct filter;
261 */
262 int num_filters(int audio_format_num)
263 {
264 return afi[audio_format_num].num_filters;
265 }
266
267 static void filter_event_handler(struct task *t)
268 {
269 PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
270 struct filter_chain *fc = t->private_data;
271 fc->error = t->ret;
272 unregister_task(t);
273 }
274
275 static void open_filters(int slot_num)
276 {
277 struct slot_info *s = &slot[slot_num];
278 struct audio_format_info *a = &afi[s->format];
279 int nf = a->num_filters;
280 int i;
281
282 s->fc = NULL;
283 if (!nf)
284 return;
285 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
286 s->fc = para_calloc(sizeof(struct filter_chain));
287 INIT_LIST_HEAD(&s->fc->filters);
288 s->fc->inbuf = s->receiver_node->buf;
289 s->fc->in_loaded = &s->receiver_node->loaded;
290 s->fc->input_error = &s->receiver_node->error;
291 s->fc->task.pre_select = filter_pre_select;
292 s->fc->task.event_handler = filter_event_handler;
293 s->fc->task.private_data = s->fc;
294 s->fc->error = 0;
295
296 s->receiver_node->output_error = &s->fc->error;
297 sprintf(s->fc->task.status, "filter chain");
298 for (i = 0; i < nf; i++) {
299 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
300 fn->conf = a->filter_conf[i];
301 fn->fc = s->fc;
302 fn->filter = a->filters[i];
303 INIT_LIST_HEAD(&fn->callbacks);
304 list_add_tail(&fn->node, &s->fc->filters);
305 fn->filter->open(fn);
306 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
307 audio_formats[s->format], i + 1, nf,
308 fn->filter->name, slot_num);
309 s->fc->outbuf = fn->buf;
310 s->fc->out_loaded = &fn->loaded;
311 }
312 register_task(&s->fc->task);
313 }
314
315 static void wng_event_handler(struct task *t)
316 {
317 struct writer_node_group *wng = t->private_data;
318
319 PARA_INFO_LOG("%s\n", para_strerror(-t->ret));
320 wng->error = t->ret;
321 wng_unregister(wng);
322 }
323
324 static void open_writers(int slot_num)
325 {
326 int ret, i;
327 struct slot_info *s = &slot[slot_num];
328 struct audio_format_info *a = &afi[s->format];
329
330 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
331 if (!a->num_writers)
332 s->wng = setup_default_wng();
333 else
334 s->wng = wng_new(a->num_writers);
335 if (s->fc) {
336 s->wng->buf = s->fc->outbuf;
337 s->wng->loaded = s->fc->out_loaded;
338 s->wng->input_error = &s->fc->error;
339 s->wng->channels = &s->fc->channels;
340 s->wng->samplerate = &s->fc->samplerate;
341 s->fc->output_error = &s->wng->error;
342 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
343 } else {
344 s->wng->buf = s->receiver_node->buf;
345 s->wng->loaded = &s->receiver_node->loaded;
346 s->wng->input_error = &s->receiver_node->error;
347 }
348 s->wng->task.event_handler = wng_event_handler;
349 for (i = 0; i < a->num_writers; i++) {
350 s->wng->writer_nodes[i].conf = a->writer_conf[i];
351 s->wng->writer_nodes[i].writer = a->writers[i];
352 }
353 ret = wng_open(s->wng);
354 if (ret < 0) {
355 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
356 return;
357 }
358 s->wstime = *now;
359 activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
360 }
361
362 static void rn_event_handler(struct task *t)
363 {
364 struct receiver_node *rn = t->private_data;
365 int i;
366
367 PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
368 unregister_task(t);
369 rn->error = t->ret;
370 /* set restart barrier */
371 FOR_EACH_SLOT(i) {
372 struct timeval restart_delay = {0, 10 * 1000};
373 if (slot[i].receiver_node != rn)
374 continue;
375 if (rn->error != -E_RECV_EOF)
376 /* don't reconnect immediately on errors */
377 restart_delay.tv_sec = 5;
378 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
379 }
380 }
381
382 static int open_receiver(int format)
383 {
384 struct audio_format_info *a = &afi[format];
385 struct slot_info *s;
386 int ret, slot_num;
387 struct receiver_node *rn;
388 const struct timeval restart_delay = {1, 0};
389
390 ret = get_empty_slot();
391 if (ret < 0)
392 goto err;
393 slot_num = ret;
394 s = &slot[slot_num];
395 s->format = format;
396 s->receiver_node = para_calloc(sizeof(struct receiver_node));
397 rn = s->receiver_node;
398 rn->receiver = a->receiver;
399 rn->conf = a->receiver_conf;
400 ret = a->receiver->open(s->receiver_node);
401 if (ret < 0) {
402 free(s->receiver_node);
403 s->receiver_node = NULL;
404 goto err;
405 }
406 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
407 audio_formats[s->format], a->receiver->name, slot_num);
408 rn->task.private_data = s->receiver_node;
409 rn->task.pre_select = a->receiver->pre_select;
410 rn->task.post_select = a->receiver->post_select;
411 rn->task.event_handler = rn_event_handler;
412 sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
413 register_task(&rn->task);
414 return 1;
415 err:
416 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
417 tv_add(now, &restart_delay, &afi[format].restart_barrier);
418 return ret;
419 }
420
421 static int receiver_running(int format)
422 {
423 int i;
424
425 FOR_EACH_SLOT(i) {
426 struct slot_info *s = &slot[i];
427 if (s->format == format && s->receiver_node
428 && !s->receiver_node->error)
429 return 1;
430 }
431 return 0;
432 }
433
434 static int open_current_receiver(struct sched *s)
435 {
436 struct timeval diff;
437 int cafn = stat_task->current_audio_format_num;
438
439 if (cafn < 0 || !stat_task->pcd)
440 return 0;
441 if (receiver_running(cafn))
442 return 0;
443 if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
444 s->timeout = diff;
445 return 0;
446 }
447 return open_receiver(cafn) < 0? 0 : 1;
448 }
449
450 static unsigned compute_time_diff(const struct timeval *status_time)
451 {
452 struct timeval tmp, diff;
453 static unsigned count;
454 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
455 const struct timeval max_deviation = {0, 500 * 1000};
456 const int time_smooth = 5;
457
458 if (!status_time)
459 return count;
460 sign = tv_diff(status_time, now, &diff);
461 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
462 // sign, sa_time_diff_sign);
463 if (!count) {
464 sa_time_diff_sign = sign;
465 stat_task->sa_time_diff = diff;
466 count++;
467 goto out;
468 }
469 if (count > 5) {
470 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
471 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
472 PARA_WARNING_LOG("time diff jump: %lims\n",
473 s * tv2ms(&tmp));
474 }
475 count++;
476 sa_time_diff_sign = tv_convex_combination(
477 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
478 count > 10? sign : sign * time_smooth, &diff,
479 &tmp);
480 stat_task->sa_time_diff = tmp;
481 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
482 sign > 0? "+" : "-",
483 tv2ms(&diff),
484 sa_time_diff_sign ? "+" : "-",
485 tv2ms(&stat_task->sa_time_diff)
486 );
487 out:
488 stat_task->sa_time_diff_sign = sa_time_diff_sign;
489 return count;
490 }
491
492 static int check_stat_line(char *line, __a_unused void *data)
493 {
494 int itemnum;
495 size_t ilen = 0;
496 long unsigned sec, usec;
497 char *tmp;
498
499 // PARA_INFO_LOG("line: %s\n", line);
500 if (!line)
501 return 1;
502 itemnum = stat_line_valid(line);
503 if (itemnum < 0) {
504 PARA_WARNING_LOG("invalid status line: %s\n", line);
505 return 1;
506 }
507 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
508 return 1;
509 tmp = make_message("%s\n", line);
510 stat_client_write(tmp, itemnum);
511 free(tmp);
512 free(stat_task->stat_item_values[itemnum]);
513 stat_task->stat_item_values[itemnum] = para_strdup(line);
514 ilen = strlen(status_item_list[itemnum]);
515 switch (itemnum) {
516 case SI_STATUS:
517 stat_task->playing = strstr(line, "playing")? 1 : 0;
518 break;
519 case SI_OFFSET:
520 stat_task->offset_seconds = atoi(line + ilen + 1);
521 break;
522 case SI_SECONDS_TOTAL:
523 stat_task->length_seconds = atoi(line + ilen + 1);
524 break;
525 case SI_STREAM_START:
526 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
527 struct timeval a_start, delay;
528 delay.tv_sec = conf.stream_delay_arg / 1000;
529 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
530 stat_task->server_stream_start.tv_sec = sec;
531 stat_task->server_stream_start.tv_usec = usec;
532 if (compute_time_diff(NULL) > 2) {
533 if (stat_task->sa_time_diff_sign < 0)
534 tv_add(&stat_task->server_stream_start,
535 &stat_task->sa_time_diff, &a_start);
536 else
537 tv_diff(&stat_task->server_stream_start,
538 &stat_task->sa_time_diff, &a_start);
539 tv_add(&a_start, &delay, &initial_delay_barrier);
540 }
541 }
542 break;
543 case SI_CURRENT_TIME:
544 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
545 struct timeval tv = {sec, usec};
546 compute_time_diff(&tv);
547 }
548 if (stat_task->clock_diff_count)
549 stat_task->clock_diff_count--;
550 break;
551 case SI_FORMAT:
552 stat_task->current_audio_format_num = get_audio_format_num(
553 line + ilen + 1);
554 }
555 return 1;
556 }
557
558 static void try_to_close_slot(int slot_num)
559 {
560 struct slot_info *s = &slot[slot_num];
561
562 if (s->format < 0)
563 return;
564 if (s->receiver_node && !s->receiver_node->error)
565 return;
566 if (s->fc && !s->fc->error)
567 return;
568 if (s->wng && !s->wng->error)
569 return;
570 PARA_INFO_LOG("closing slot %d\n", slot_num);
571 wng_close(s->wng);
572 close_filters(s->fc);
573 free(s->fc);
574 close_receiver(slot_num);
575 clear_slot(slot_num);
576 }
577
578 /*
579 * Check if any receivers/filters/writers need to be started and do so if
580 * necessary. Since the pre_select function didn't have a chance yet to put
581 * file descriptors into the fd sets given by s, make the upcoming select()
582 * return immediately to avoid a long timeout in case we started something.
583 */
584 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
585 {
586 int i;
587 struct timeval min_delay = {0, 1};
588
589 t->ret = 1;
590 if (audiod_status != AUDIOD_ON || !stat_task->playing)
591 return kill_all_decoders(-E_NOT_PLAYING);
592 if (open_current_receiver(s))
593 s->timeout = min_delay;
594 FOR_EACH_SLOT(i) {
595 struct slot_info *sl = &slot[i];
596 struct audio_format_info *a;
597 struct timeval diff;
598
599 if (sl->format < 0)
600 continue;
601 a = &afi[sl->format];
602 if (!sl->receiver_node)
603 continue;
604 if ((!a->num_filters || sl->fc) && sl->wng)
605 continue; /* everything already started */
606 if (!a->num_filters) {
607 if (sl->receiver_node->loaded && !sl->wng) {
608 open_writers(i);
609 s->timeout = min_delay;
610 }
611 continue;
612 }
613 if (sl->receiver_node->loaded && !sl->fc) {
614 open_filters(i);
615 s->timeout = min_delay;
616 continue;
617 }
618 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
619 continue;
620 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
621 open_writers(i);
622 s->timeout = min_delay;
623 continue;
624 }
625 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
626 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
627 s->timeout = diff;
628 }
629 }
630 }
631
632 static void audiod_post_select(__a_unused struct sched *s,
633 __a_unused struct task *t)
634 {
635 int i;
636
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 = conf.receiver_given - 1; i >= 0; i--) {
733 char *arg = conf.receiver_arg[i];
734 char *recv_arg = strchr(arg, ':');
735 ret = -E_MISSING_COLON;
736 if (!recv_arg)
737 goto out;
738 *recv_arg = '\0';
739 recv_arg++;
740 ret = get_audio_format_num(arg);
741 if (ret < 0)
742 goto out;
743 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &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 /* does not unlink socket on errors */
852 static int audiod_get_socket(void)
853 {
854 struct sockaddr_un unix_addr;
855 int ret, fd;
856
857 if (conf.socket_given)
858 socket_name = para_strdup(conf.socket_arg);
859 else {
860 char *hn = para_hostname();
861 socket_name = make_message("/var/paraslash/audiod_socket.%s",
862 hn);
863 free(hn);
864 }
865 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
866 if (conf.force_given)
867 unlink(socket_name);
868 ret = create_local_socket(socket_name, &unix_addr,
869 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
870 if (ret < 0)
871 goto err;
872 fd = ret;
873 if (listen(fd , 5) < 0) {
874 ret = -ERRNO_TO_PARA_ERROR(errno);
875 goto err;
876 }
877 ret = mark_fd_nonblocking(fd);
878 if (ret < 0)
879 goto err;
880 return fd;
881 err:
882 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
883 exit(EXIT_FAILURE);
884 }
885
886 static void signal_event_handler(struct task *t)
887 {
888 struct signal_task *st = t->private_data;
889
890 switch (st->signum) {
891 case SIGINT:
892 case SIGTERM:
893 case SIGHUP:
894 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
895 clean_exit(EXIT_FAILURE, "caught deadly signal");
896 }
897 }
898
899 static void signal_pre_select(struct sched *s, struct task *t)
900 {
901 struct signal_task *st = t->private_data;
902 t->ret = 1;
903 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
904 }
905
906 static void signal_post_select(struct sched *s, struct task *t)
907 {
908 struct signal_task *st = t->private_data;
909 t->ret = 1;
910 if (!FD_ISSET(st->fd, &s->rfds))
911 return;
912 t->ret = -E_SIGNAL_CAUGHT;
913 st->signum = para_next_signal();
914 }
915
916 static void signal_setup_default(struct signal_task *st)
917 {
918 st->task.pre_select = signal_pre_select;
919 st->task.post_select = signal_post_select;
920 st->task.private_data = st;
921 sprintf(st->task.status, "signal task");
922 }
923
924 static void command_pre_select(struct sched *s, struct task *t)
925 {
926 struct command_task *ct = t->private_data;
927 t->ret = 1;
928 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
929
930 }
931
932 static void command_post_select(struct sched *s, struct task *t)
933 {
934 int ret;
935 struct command_task *ct = t->private_data;
936
937 t->ret = 1; /* always successful */
938 audiod_status_dump();
939 if (!FD_ISSET(ct->fd, &s->rfds))
940 return;
941 ret = handle_connect(ct->fd);
942 if (ret < 0)
943 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
944 }
945
946 static void init_command_task(struct command_task *ct)
947 {
948 ct->task.pre_select = command_pre_select;
949 ct->task.post_select = command_post_select;
950 ct->task.event_handler = NULL;
951 ct->task.private_data = ct;
952 ct->fd = audiod_get_socket(); /* doesn't return on errors */
953 sprintf(ct->task.status, "command task");
954 }
955
956 static void close_stat_pipe(void)
957 {
958 int i;
959
960 if (!stat_task->pcd)
961 return;
962 client_close(stat_task->pcd);
963 stat_task->pcd = NULL;
964 FOR_EACH_STATUS_ITEM(i) {
965 free(stat_task->stat_item_values[i]);
966 stat_task->stat_item_values[i] = NULL;
967 }
968 dump_empty_status();
969 stat_task->length_seconds = 0;
970 stat_task->offset_seconds = 0;
971 audiod_status_dump();
972 stat_task->playing = 0;
973 stat_task->stat_item_values[SI_BASENAME] = make_message(
974 "%s: no connection to para_server\n",
975 status_item_list[SI_BASENAME]);
976 stat_client_write(stat_task->stat_item_values[SI_BASENAME],
977 SI_BASENAME);
978 if (stat_task->clock_diff_count) {
979 stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
980 stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
981 }
982 }
983
984 /**
985 * close the connection to para_server and exit
986 *
987 * \param status the exit status which is passed to exit(3)
988 * \param msg the log message
989 *
990 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
991 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
992 * EXIT_FAILURE.
993 *
994 * \sa exit(3)
995 */
996 void __noreturn clean_exit(int status, const char *msg)
997 {
998 PARA_EMERG_LOG("%s\n", msg);
999 if (socket_name)
1000 unlink(socket_name);
1001 close_stat_pipe();
1002 exit(status);
1003 }
1004
1005 /* avoid busy loop if server is down */
1006 static void set_stat_task_restart_barrier(void)
1007 {
1008 struct timeval delay = {5, 0};
1009 tv_add(now, &delay, &stat_task->restart_barrier);
1010 }
1011
1012 static void client_task_event_handler(__a_unused struct task *t)
1013 {
1014 int i;
1015
1016 if (t->ret == -E_HANDSHAKE_COMPLETE)
1017 return;
1018 unregister_task(t);
1019 close_stat_pipe();
1020 if (t->ret != -E_SERVER_EOF)
1021 stat_task->clock_diff_count = conf.clock_diff_count_arg;
1022 set_stat_task_restart_barrier();
1023 FOR_EACH_AUDIO_FORMAT(i)
1024 afi[i].restart_barrier = stat_task->restart_barrier;
1025 }
1026
1027 static void status_pre_select(struct sched *s, struct task *t)
1028 {
1029 struct status_task *st = t->private_data;
1030 int ret;
1031
1032 t->ret = 1; /* always successful */
1033 if (st->pcd || audiod_status == AUDIOD_OFF)
1034 return;
1035 if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
1036 < 0)
1037 return;
1038 if (st->clock_diff_count) {
1039 char *argv[] = {"audiod", "stat", "1", NULL};
1040 int argc = 3;
1041 if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
1042 return;
1043 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1044 ret = client_open(argc, argv, &st->pcd);
1045
1046 } else {
1047 char *argv[] = {"audiod", "stat", NULL};
1048 int argc = 2;
1049 ret = client_open(argc, argv, &st->pcd);
1050 }
1051 set_stat_task_restart_barrier();
1052 if (ret < 0)
1053 return;
1054 st->pcd->task.event_handler = client_task_event_handler;
1055 s->timeout.tv_sec = 0;
1056 s->timeout.tv_usec = 1;
1057 }
1058
1059 static void status_post_select(__a_unused struct sched *s, struct task *t)
1060 {
1061 struct status_task *st = t->private_data;
1062 unsigned bytes_left;
1063
1064 t->ret = 1;
1065 if (!st->pcd || st->pcd->status != CL_RECEIVING)
1066 return;
1067 if (st->pcd && audiod_status == AUDIOD_OFF) {
1068 unregister_task(&st->pcd->task);
1069 close_stat_pipe();
1070 st->clock_diff_count = conf.clock_diff_count_arg;
1071 return;
1072 }
1073 bytes_left = for_each_line(st->pcd->buf, st->pcd->loaded,
1074 &check_stat_line, NULL);
1075 if (st->pcd->loaded != bytes_left) {
1076 st->last_status_read = *now;
1077 st->pcd->loaded = bytes_left;
1078 } else {
1079 struct timeval diff;
1080 tv_diff(now, &st->last_status_read, &diff);
1081 if (diff.tv_sec > 61)
1082 close_stat_pipe();
1083 }
1084 }
1085
1086 static void init_status_task(struct status_task *st)
1087 {
1088 memset(st, 0, sizeof(struct status_task));
1089 st->task.pre_select = status_pre_select;
1090 st->task.post_select = status_post_select;
1091 st->task.private_data = st;
1092 st->sa_time_diff_sign = 1;
1093 st->clock_diff_count = conf.clock_diff_count_arg;
1094 st->current_audio_format_num = -1;
1095 sprintf(st->task.status, "status task");
1096 }
1097
1098 static void set_initial_status(void)
1099 {
1100 audiod_status = AUDIOD_ON;
1101 if (!conf.mode_given)
1102 return;
1103 if (!strcmp(conf.mode_arg, "sb")) {
1104 audiod_status = AUDIOD_STANDBY;
1105 return;
1106 }
1107 if (!strcmp(conf.mode_arg, "off")) {
1108 audiod_status = AUDIOD_OFF;
1109 return;
1110 }
1111 if (strcmp(conf.mode_arg, "on"))
1112 PARA_WARNING_LOG("%s", "invalid mode\n");
1113 }
1114
1115 /**
1116 * the main function of para_audiod
1117 *
1118 * \param argc usual argument count
1119 * \param argv usual argument vector
1120 *
1121 * \return EXIT_SUCCESS or EXIT_FAILURE
1122 *
1123 * \sa para_audiod(1)
1124 * */
1125 int main(int argc, char *argv[])
1126 {
1127 char *config_file;
1128 int ret, i;
1129 struct sched s;
1130 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1131 struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1132
1133 valid_fd_012();
1134 audiod_cmdline_parser(argc, argv, &conf);
1135 HANDLE_VERSION_FLAG("audiod", conf);
1136 para_drop_privileges(conf.user_arg, conf.group_arg);
1137 config_file = configfile_exists();
1138 if (config_file) {
1139 struct audiod_cmdline_parser_params params = {
1140 .override = 0,
1141 .initialize = 0,
1142 .check_required = 0,
1143 .check_ambiguity = 0
1144
1145 };
1146 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1147 PARA_EMERG_LOG("%s", "parse error in config file\n");
1148 exit(EXIT_FAILURE);
1149 }
1150 free(config_file);
1151 }
1152 if (conf.logfile_given)
1153 logfile = open_log(conf.logfile_arg);
1154 log_welcome("para_audiod", conf.loglevel_arg);
1155 i = init_stream_io();
1156 if (i < 0) {
1157 PARA_EMERG_LOG("init stream io error: %s\n", para_strerror(-i));
1158 exit(EXIT_FAILURE);
1159 }
1160 server_uptime(UPTIME_SET);
1161 set_initial_status();
1162 FOR_EACH_SLOT(i)
1163 clear_slot(i);
1164 init_grabbing();
1165 setup_signal_handling();
1166 signal_setup_default(sig_task);
1167 sig_task->task.event_handler = signal_event_handler;
1168
1169 init_status_task(stat_task);
1170 init_command_task(cmd_task);
1171 init_audiod_task(audiod_task);
1172
1173 if (conf.daemon_given)
1174 daemon_init();
1175
1176 register_task(&sig_task->task);
1177 register_task(&cmd_task->task);
1178 register_task(&stat_task->task);
1179 register_task(audiod_task);
1180 s.default_timeout.tv_sec = 0;
1181 s.default_timeout.tv_usec = 99 * 1000;
1182 ret = schedule(&s);
1183
1184 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1185 return EXIT_FAILURE;
1186 }