701f827848b112b735e3fa16cae371934200e8a8
[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 (!hostname)
148 hostname = para_hostname();
149 outfd = logfile? logfile : stderr;
150 time(&t1);
151 tm = localtime(&t1);
152 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
153 fprintf(outfd, "%s %s ", str, hostname);
154 if (conf.loglevel_arg <= INFO)
155 fprintf(outfd, "%i ", ll);
156 va_start(argp, fmt);
157 vfprintf(outfd, fmt, argp);
158 va_end(argp);
159 }
160
161 static char *configfile_exists(void)
162 {
163 char *home = para_homedir();
164 char *config_file = make_message("%s/.paraslash/audiod.conf",
165 home);
166 free(home);
167 if (file_exists(config_file))
168 return config_file;
169 free(config_file);
170 return NULL;
171 }
172
173 static void setup_signal_handling(void)
174 {
175 sig_task->fd = para_signal_init();
176 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
177 para_install_sighandler(SIGINT);
178 para_install_sighandler(SIGTERM);
179 para_install_sighandler(SIGHUP);
180 signal(SIGPIPE, SIG_IGN);
181 }
182
183 static void clear_slot(int slot_num)
184 {
185 struct slot_info *s = &slot[slot_num];
186
187 PARA_INFO_LOG("clearing slot %d\n", slot_num);
188 memset(s, 0, sizeof(struct slot_info));
189 s->format = -1;
190 }
191
192 static void close_receiver(int slot_num)
193 {
194 struct slot_info *s = &slot[slot_num];
195 struct audio_format_info *a;
196
197 if (s->format < 0 || !s->receiver_node)
198 return;
199 a = &afi[s->format];
200 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
201 audio_formats[s->format], slot_num);
202 a->receiver->close(s->receiver_node);
203 free(s->receiver_node);
204 s->receiver_node = NULL;
205 }
206
207 static void kill_all_decoders(int error)
208 {
209 int i;
210
211 FOR_EACH_SLOT(i) {
212 struct slot_info *s = &slot[i];
213 if (s->wng && !s->wng->error) {
214 PARA_INFO_LOG("unregistering writer node group in slot %d\n",
215 i);
216 wng_unregister(s->wng);
217 s->wng->error = error;
218 }
219 if (s->fc && !s->fc->error) {
220 PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
221 unregister_task(&s->fc->task);
222 s->fc->error = error;
223 }
224 if (s->receiver_node && !s->receiver_node->error) {
225 PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
226 unregister_task(&s->receiver_node->task);
227 s->receiver_node->error = error;
228 }
229 }
230 }
231
232 static int get_empty_slot(void)
233 {
234 int i;
235 struct slot_info *s;
236
237 FOR_EACH_SLOT(i) {
238 s = &slot[i];
239 if (s->format < 0) {
240 clear_slot(i);
241 return i;
242 }
243 if (s->wng || s->receiver_node || s->fc)
244 continue;
245 clear_slot(i);
246 return i;
247 }
248 return -E_NO_MORE_SLOTS;
249 }
250
251 /**
252 * get the number of filters
253 *
254 * \param audio_format_num the number identifying the audio format
255 *
256 * \return the number of filters for the given audio format
257 *
258 * \sa struct filter;
259 */
260 int num_filters(int audio_format_num)
261 {
262 return afi[audio_format_num].num_filters;
263 }
264
265 static void filter_event_handler(struct task *t)
266 {
267 PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
268 struct filter_chain *fc = t->private_data;
269 fc->error = t->ret;
270 unregister_task(t);
271 }
272
273 static void open_filters(int slot_num)
274 {
275 struct slot_info *s = &slot[slot_num];
276 struct audio_format_info *a = &afi[s->format];
277 int nf = a->num_filters;
278 int i;
279
280 s->fc = NULL;
281 if (!nf)
282 return;
283 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
284 s->fc = para_calloc(sizeof(struct filter_chain));
285 INIT_LIST_HEAD(&s->fc->filters);
286 s->fc->inbuf = s->receiver_node->buf;
287 s->fc->in_loaded = &s->receiver_node->loaded;
288 s->fc->input_error = &s->receiver_node->error;
289 s->fc->task.pre_select = filter_pre_select;
290 s->fc->task.event_handler = filter_event_handler;
291 s->fc->task.private_data = s->fc;
292 s->fc->error = 0;
293
294 s->receiver_node->output_error = &s->fc->error;
295 sprintf(s->fc->task.status, "filter chain");
296 for (i = 0; i < nf; i++) {
297 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
298 fn->conf = a->filter_conf[i];
299 fn->fc = s->fc;
300 fn->filter = a->filters[i];
301 INIT_LIST_HEAD(&fn->callbacks);
302 list_add_tail(&fn->node, &s->fc->filters);
303 fn->filter->open(fn);
304 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
305 audio_formats[s->format], i + 1, nf,
306 fn->filter->name, slot_num);
307 s->fc->outbuf = fn->buf;
308 s->fc->out_loaded = &fn->loaded;
309 }
310 register_task(&s->fc->task);
311 }
312
313 static void wng_event_handler(struct task *t)
314 {
315 struct writer_node_group *wng = t->private_data;
316
317 PARA_INFO_LOG("%s\n", para_strerror(-t->ret));
318 wng->error = t->ret;
319 wng_unregister(wng);
320 }
321
322 static void open_writers(int slot_num)
323 {
324 int ret, i;
325 struct slot_info *s = &slot[slot_num];
326 struct audio_format_info *a = &afi[s->format];
327
328 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
329 if (!a->num_writers)
330 s->wng = setup_default_wng();
331 else
332 s->wng = wng_new(a->num_writers);
333 if (s->fc) {
334 s->wng->buf = s->fc->outbuf;
335 s->wng->loaded = s->fc->out_loaded;
336 s->wng->input_error = &s->fc->error;
337 s->wng->channels = &s->fc->channels;
338 s->wng->samplerate = &s->fc->samplerate;
339 s->fc->output_error = &s->wng->error;
340 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
341 } else {
342 s->wng->buf = s->receiver_node->buf;
343 s->wng->loaded = &s->receiver_node->loaded;
344 s->wng->input_error = &s->receiver_node->error;
345 }
346 s->wng->task.event_handler = wng_event_handler;
347 for (i = 0; i < a->num_writers; i++) {
348 s->wng->writer_nodes[i].conf = a->writer_conf[i];
349 s->wng->writer_nodes[i].writer = a->writers[i];
350 }
351 ret = wng_open(s->wng);
352 if (ret < 0) {
353 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
354 return;
355 }
356 s->wstime = *now;
357 activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
358 }
359
360 static void rn_event_handler(struct task *t)
361 {
362 struct receiver_node *rn = t->private_data;
363 int i;
364
365 PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
366 unregister_task(t);
367 rn->error = t->ret;
368 /* set restart barrier */
369 FOR_EACH_SLOT(i) {
370 struct timeval restart_delay = {0, 10 * 1000};
371 if (slot[i].receiver_node != rn)
372 continue;
373 if (rn->error != -E_RECV_EOF)
374 /* don't reconnect immediately on errors */
375 restart_delay.tv_sec = 5;
376 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
377 }
378 }
379
380 static int open_receiver(int format)
381 {
382 struct audio_format_info *a = &afi[format];
383 struct slot_info *s;
384 int ret, slot_num;
385 struct receiver_node *rn;
386 const struct timeval restart_delay = {1, 0};
387
388 ret = get_empty_slot();
389 if (ret < 0)
390 goto err;
391 slot_num = ret;
392 s = &slot[slot_num];
393 s->format = format;
394 s->receiver_node = para_calloc(sizeof(struct receiver_node));
395 rn = s->receiver_node;
396 rn->receiver = a->receiver;
397 rn->conf = a->receiver_conf;
398 ret = a->receiver->open(s->receiver_node);
399 if (ret < 0) {
400 free(s->receiver_node);
401 s->receiver_node = NULL;
402 goto err;
403 }
404 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
405 audio_formats[s->format], a->receiver->name, slot_num);
406 rn->task.private_data = s->receiver_node;
407 rn->task.pre_select = a->receiver->pre_select;
408 rn->task.post_select = a->receiver->post_select;
409 rn->task.event_handler = rn_event_handler;
410 sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
411 register_task(&rn->task);
412 return 1;
413 err:
414 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
415 tv_add(now, &restart_delay, &afi[format].restart_barrier);
416 return ret;
417 }
418
419 static int receiver_running(int format)
420 {
421 int i;
422
423 FOR_EACH_SLOT(i) {
424 struct slot_info *s = &slot[i];
425 if (s->format == format && s->receiver_node
426 && !s->receiver_node->error)
427 return 1;
428 }
429 return 0;
430 }
431
432 static int open_current_receiver(struct sched *s)
433 {
434 struct timeval diff;
435 int cafn = stat_task->current_audio_format_num;
436
437 if (cafn < 0 || !stat_task->pcd)
438 return 0;
439 if (receiver_running(cafn))
440 return 0;
441 if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
442 s->timeout = diff;
443 return 0;
444 }
445 return open_receiver(cafn) < 0? 0 : 1;
446 }
447
448 static unsigned compute_time_diff(const struct timeval *status_time)
449 {
450 struct timeval tmp, diff;
451 static unsigned count;
452 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
453 const struct timeval max_deviation = {0, 500 * 1000};
454 const int time_smooth = 5;
455
456 if (!status_time)
457 return count;
458 sign = tv_diff(status_time, now, &diff);
459 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
460 // sign, sa_time_diff_sign);
461 if (!count) {
462 sa_time_diff_sign = sign;
463 stat_task->sa_time_diff = diff;
464 count++;
465 goto out;
466 }
467 if (count > 5) {
468 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
469 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
470 PARA_WARNING_LOG("time diff jump: %lims\n",
471 s * tv2ms(&tmp));
472 }
473 count++;
474 sa_time_diff_sign = tv_convex_combination(
475 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
476 count > 10? sign : sign * time_smooth, &diff,
477 &tmp);
478 stat_task->sa_time_diff = tmp;
479 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
480 sign > 0? "+" : "-",
481 tv2ms(&diff),
482 sa_time_diff_sign ? "+" : "-",
483 tv2ms(&stat_task->sa_time_diff)
484 );
485 out:
486 stat_task->sa_time_diff_sign = sa_time_diff_sign;
487 return count;
488 }
489
490 static int check_stat_line(char *line, __a_unused void *data)
491 {
492 int itemnum;
493 size_t ilen = 0;
494 long unsigned sec, usec;
495 char *tmp;
496
497 // PARA_INFO_LOG("line: %s\n", line);
498 if (!line)
499 return 1;
500 itemnum = stat_line_valid(line);
501 if (itemnum < 0) {
502 PARA_WARNING_LOG("invalid status line: %s\n", line);
503 return 1;
504 }
505 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
506 return 1;
507 tmp = make_message("%s\n", line);
508 stat_client_write(tmp, itemnum);
509 free(tmp);
510 free(stat_task->stat_item_values[itemnum]);
511 stat_task->stat_item_values[itemnum] = para_strdup(line);
512 ilen = strlen(status_item_list[itemnum]);
513 switch (itemnum) {
514 case SI_STATUS:
515 stat_task->playing = strstr(line, "playing")? 1 : 0;
516 break;
517 case SI_OFFSET:
518 stat_task->offset_seconds = atoi(line + ilen + 1);
519 break;
520 case SI_SECONDS_TOTAL:
521 stat_task->length_seconds = atoi(line + ilen + 1);
522 break;
523 case SI_STREAM_START:
524 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
525 struct timeval a_start, delay;
526 delay.tv_sec = conf.stream_delay_arg / 1000;
527 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
528 stat_task->server_stream_start.tv_sec = sec;
529 stat_task->server_stream_start.tv_usec = usec;
530 if (compute_time_diff(NULL) > 2) {
531 if (stat_task->sa_time_diff_sign < 0)
532 tv_add(&stat_task->server_stream_start,
533 &stat_task->sa_time_diff, &a_start);
534 else
535 tv_diff(&stat_task->server_stream_start,
536 &stat_task->sa_time_diff, &a_start);
537 tv_add(&a_start, &delay, &initial_delay_barrier);
538 }
539 }
540 break;
541 case SI_CURRENT_TIME:
542 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
543 struct timeval tv = {sec, usec};
544 compute_time_diff(&tv);
545 }
546 if (stat_task->clock_diff_count)
547 stat_task->clock_diff_count--;
548 break;
549 case SI_FORMAT:
550 stat_task->current_audio_format_num = get_audio_format_num(
551 line + ilen + 1);
552 }
553 return 1;
554 }
555
556 static void try_to_close_slot(int slot_num)
557 {
558 struct slot_info *s = &slot[slot_num];
559
560 if (s->format < 0)
561 return;
562 if (s->receiver_node && !s->receiver_node->error)
563 return;
564 if (s->fc && !s->fc->error)
565 return;
566 if (s->wng && !s->wng->error)
567 return;
568 PARA_INFO_LOG("closing slot %d\n", slot_num);
569 wng_close(s->wng);
570 close_filters(s->fc);
571 free(s->fc);
572 close_receiver(slot_num);
573 clear_slot(slot_num);
574 }
575
576 /*
577 * Check if any receivers/filters/writers need to be started and do so if
578 * necessary. Since the pre_select function didn't have a chance yet to put
579 * file descriptors into the fd sets given by s, make the upcoming select()
580 * return immediately to avoid a long timeout in case we started something.
581 */
582 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
583 {
584 int i;
585 struct timeval min_delay = {0, 1};
586
587 t->ret = 1;
588 if (audiod_status != AUDIOD_ON || !stat_task->playing)
589 return kill_all_decoders(-E_NOT_PLAYING);
590 if (open_current_receiver(s))
591 s->timeout = min_delay;
592 FOR_EACH_SLOT(i) {
593 struct slot_info *sl = &slot[i];
594 struct audio_format_info *a;
595 struct timeval diff;
596
597 if (sl->format < 0)
598 continue;
599 a = &afi[sl->format];
600 if (!sl->receiver_node)
601 continue;
602 if (!a->num_filters) {
603 if (sl->receiver_node->loaded && !sl->wng) {
604 open_writers(i);
605 s->timeout = min_delay;
606 }
607 continue;
608 }
609 if (sl->receiver_node->loaded && !sl->fc) {
610 open_filters(i);
611 s->timeout = min_delay;
612 continue;
613 }
614 if (!sl->fc || !*sl->fc->out_loaded || sl->wng)
615 continue;
616 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
617 open_writers(i);
618 s->timeout = min_delay;
619 continue;
620 }
621 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
622 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
623 s->timeout = diff;
624 }
625 }
626 }
627
628 static void audiod_post_select(__a_unused struct sched *s,
629 __a_unused struct task *t)
630 {
631 int i;
632
633 t->ret = 1;
634 FOR_EACH_SLOT(i)
635 try_to_close_slot(i);
636 }
637
638 static void init_audiod_task(struct task *t)
639 {
640 t->pre_select = audiod_pre_select;
641 t->post_select = audiod_post_select;
642 t->event_handler = NULL;
643 t->private_data = t;
644 sprintf(t->status, "audiod task");
645 }
646
647 static int parse_stream_command(const char *txt, char **cmd)
648 {
649 char *p = strchr(txt, ':');
650 int i;
651
652 if (!p)
653 return -E_MISSING_COLON;
654 p++;
655 FOR_EACH_AUDIO_FORMAT(i) {
656 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
657 continue;
658 *cmd = p;
659 return i;
660 }
661 return -E_UNSUPPORTED_AUDIO_FORMAT;
662 }
663
664 static int add_filter(int format, char *cmdline)
665 {
666 struct audio_format_info *a = &afi[format];
667 int filter_num, nf = a->num_filters;
668
669 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
670 if (filter_num < 0)
671 return filter_num;
672 a->filters[nf] = &filters[filter_num];
673 a->num_filters++;
674 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
675 a->filters[nf]->name);
676 return filter_num;
677 }
678
679 static int init_writers(void)
680 {
681 int i, ret, nw;
682 char *cmd;
683 struct audio_format_info *a;
684
685 init_supported_writers();
686 nw = PARA_MAX(1, conf.writer_given);
687 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
688 FOR_EACH_AUDIO_FORMAT(i) {
689 a = &afi[i];
690 a->writer_conf = para_malloc(nw * sizeof(void *));
691 a->writers = para_malloc(nw * sizeof(struct writer *));
692 a->num_writers = 0;
693 }
694 for (i = 0; i < conf.writer_given; i++) {
695 void *wconf;
696 int writer_num;
697 ret = parse_stream_command(conf.writer_arg[i], &cmd);
698 if (ret < 0)
699 goto out;
700 a = &afi[ret];
701 nw = a->num_writers;
702 wconf = check_writer_arg(cmd, &writer_num);
703 if (!wconf) {
704 ret = writer_num;
705 goto out;
706 }
707 a->writers[nw] = &writers[writer_num];
708 a->writer_conf[nw] = wconf;
709 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
710 nw, writer_names[writer_num]);
711 a->num_writers++;
712 }
713 ret = 1;
714 out:
715 return ret;
716 }
717
718 static int init_receivers(void)
719 {
720 int i, ret, receiver_num;
721 char *cmd = NULL;
722 struct audio_format_info *a;
723
724 for (i = 0; receivers[i].name; i++) {
725 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
726 receivers[i].init(&receivers[i]);
727 }
728 for (i = conf.receiver_given - 1; i >= 0; i--) {
729 char *arg = conf.receiver_arg[i];
730 char *recv_arg = strchr(arg, ':');
731 ret = -E_MISSING_COLON;
732 if (!recv_arg)
733 goto out;
734 *recv_arg = '\0';
735 recv_arg++;
736 ret = get_audio_format_num(arg);
737 if (ret < 0)
738 goto out;
739 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
740 if (!afi[ret].receiver_conf) {
741 ret = -E_RECV_SYNTAX;
742 goto out;
743 }
744 afi[ret].receiver = &receivers[receiver_num];
745 }
746 /* use the first available receiver with no arguments
747 * for those audio formats for which no receiver
748 * was specified
749 */
750 cmd = para_strdup(receivers[0].name);
751 FOR_EACH_AUDIO_FORMAT(i) {
752 a = &afi[i];
753 if (a->receiver_conf)
754 continue;
755 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
756 if (!a->receiver_conf)
757 return -E_RECV_SYNTAX;
758 a->receiver = &receivers[receiver_num];
759 }
760 ret = 1;
761 out:
762 free(cmd);
763 return ret;
764 }
765
766 static int init_default_filters(void)
767 {
768 int i, ret = 1;
769
770 FOR_EACH_AUDIO_FORMAT(i) {
771 struct audio_format_info *a = &afi[i];
772 char *tmp;
773 int j;
774
775 if (a->num_filters)
776 continue; /* no default -- nothing to to */
777 /* add "dec" to audio format name */
778 tmp = make_message("%sdec", audio_formats[i]);
779 for (j = 0; filters[j].name; j++)
780 if (!strcmp(tmp, filters[j].name))
781 break;
782 free(tmp);
783 ret = -E_UNSUPPORTED_FILTER;
784 if (!filters[j].name)
785 goto out;
786 tmp = para_strdup(filters[j].name);
787 ret = add_filter(i, tmp);
788 free(tmp);
789 if (ret < 0)
790 goto out;
791 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
792 filters[j].name);
793 }
794 out:
795 return ret;
796 }
797
798 static int init_filters(void)
799 {
800 int i, ret, nf;
801
802 filter_init(filters);
803 nf = PARA_MAX(1, conf.filter_given);
804 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
805 FOR_EACH_AUDIO_FORMAT(i) {
806 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
807 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
808 }
809 if (!conf.no_default_filters_given)
810 return init_default_filters();
811 for (i = 0; i < conf.filter_given; i++) {
812 char *arg = conf.filter_arg[i];
813 char *filter_name = strchr(arg, ':');
814 ret = -E_MISSING_COLON;
815 if (!filter_name)
816 goto out;
817 *filter_name = '\0';
818 filter_name++;
819 ret = get_audio_format_num(arg);
820 if (ret < 0)
821 goto out;
822 ret = add_filter(ret, filter_name);
823 if (ret < 0)
824 goto out;
825 }
826 ret = init_default_filters(); /* use default values for the rest */
827 out:
828 return ret;
829 }
830
831 static int init_stream_io(void)
832 {
833 int ret;
834
835 ret = init_writers();
836 if (ret < 0)
837 return ret;
838 ret = init_receivers();
839 if (ret < 0)
840 return ret;
841 ret = init_filters();
842 if (ret < 0)
843 return ret;
844 return 1;
845 }
846
847 /* does not unlink socket on errors */
848 static int audiod_get_socket(void)
849 {
850 struct sockaddr_un unix_addr;
851 int ret, fd;
852
853 if (conf.socket_given)
854 socket_name = para_strdup(conf.socket_arg);
855 else {
856 char *hn = para_hostname();
857 socket_name = make_message("/var/paraslash/audiod_socket.%s",
858 hn);
859 free(hn);
860 }
861 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
862 if (conf.force_given)
863 unlink(socket_name);
864 ret = create_local_socket(socket_name, &unix_addr,
865 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
866 if (ret < 0)
867 goto err;
868 fd = ret;
869 if (listen(fd , 5) < 0) {
870 ret = -ERRNO_TO_PARA_ERROR(errno);
871 goto err;
872 }
873 ret = mark_fd_nonblocking(fd);
874 if (ret < 0)
875 goto err;
876 return fd;
877 err:
878 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
879 exit(EXIT_FAILURE);
880 }
881
882 static void signal_event_handler(struct task *t)
883 {
884 struct signal_task *st = t->private_data;
885
886 switch (st->signum) {
887 case SIGINT:
888 case SIGTERM:
889 case SIGHUP:
890 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
891 clean_exit(EXIT_FAILURE, "caught deadly signal");
892 }
893 }
894
895 static void signal_pre_select(struct sched *s, struct task *t)
896 {
897 struct signal_task *st = t->private_data;
898 t->ret = 1;
899 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
900 }
901
902 static void signal_post_select(struct sched *s, struct task *t)
903 {
904 struct signal_task *st = t->private_data;
905 t->ret = 1;
906 if (!FD_ISSET(st->fd, &s->rfds))
907 return;
908 t->ret = -E_SIGNAL_CAUGHT;
909 st->signum = para_next_signal();
910 }
911
912 static void signal_setup_default(struct signal_task *st)
913 {
914 st->task.pre_select = signal_pre_select;
915 st->task.post_select = signal_post_select;
916 st->task.private_data = st;
917 sprintf(st->task.status, "signal task");
918 }
919
920 static void command_pre_select(struct sched *s, struct task *t)
921 {
922 struct command_task *ct = t->private_data;
923 t->ret = 1;
924 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
925
926 }
927
928 static void command_post_select(struct sched *s, struct task *t)
929 {
930 int ret;
931 struct command_task *ct = t->private_data;
932
933 t->ret = 1; /* always successful */
934 audiod_status_dump();
935 if (!FD_ISSET(ct->fd, &s->rfds))
936 return;
937 ret = handle_connect(ct->fd);
938 if (ret < 0)
939 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
940 }
941
942 static void init_command_task(struct command_task *ct)
943 {
944 ct->task.pre_select = command_pre_select;
945 ct->task.post_select = command_post_select;
946 ct->task.event_handler = NULL;
947 ct->task.private_data = ct;
948 ct->fd = audiod_get_socket(); /* doesn't return on errors */
949 sprintf(ct->task.status, "command task");
950 }
951
952 static void close_stat_pipe(void)
953 {
954 int i;
955
956 if (!stat_task->pcd)
957 return;
958 client_close(stat_task->pcd);
959 stat_task->pcd = NULL;
960 FOR_EACH_STATUS_ITEM(i) {
961 free(stat_task->stat_item_values[i]);
962 stat_task->stat_item_values[i] = NULL;
963 }
964 dump_empty_status();
965 stat_task->length_seconds = 0;
966 stat_task->offset_seconds = 0;
967 audiod_status_dump();
968 stat_task->playing = 0;
969 stat_task->stat_item_values[SI_BASENAME] = make_message(
970 "%s: no connection to para_server\n",
971 status_item_list[SI_BASENAME]);
972 stat_client_write(stat_task->stat_item_values[SI_BASENAME],
973 SI_BASENAME);
974 if (stat_task->clock_diff_count) {
975 stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
976 stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
977 }
978 }
979
980 /**
981 * close the connection to para_server and exit
982 *
983 * \param status the exit status which is passed to exit(3)
984 * \param msg the log message
985 *
986 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
987 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
988 * EXIT_FAILURE.
989 *
990 * \sa exit(3)
991 */
992 void __noreturn clean_exit(int status, const char *msg)
993 {
994 PARA_EMERG_LOG("%s\n", msg);
995 if (socket_name)
996 unlink(socket_name);
997 close_stat_pipe();
998 exit(status);
999 }
1000
1001 /* avoid busy loop if server is down */
1002 static void set_stat_task_restart_barrier(void)
1003 {
1004 struct timeval delay = {5, 0};
1005 tv_add(now, &delay, &stat_task->restart_barrier);
1006 }
1007
1008 static void client_task_event_handler(__a_unused struct task *t)
1009 {
1010 int i;
1011
1012 if (t->ret == -E_HANDSHAKE_COMPLETE)
1013 return;
1014 unregister_task(t);
1015 close_stat_pipe();
1016 if (t->ret != -E_SERVER_EOF)
1017 stat_task->clock_diff_count = conf.clock_diff_count_arg;
1018 set_stat_task_restart_barrier();
1019 FOR_EACH_AUDIO_FORMAT(i)
1020 afi[i].restart_barrier = stat_task->restart_barrier;
1021 }
1022
1023 static void status_pre_select(struct sched *s, struct task *t)
1024 {
1025 struct status_task *st = t->private_data;
1026 int ret;
1027
1028 t->ret = 1; /* always successful */
1029 if (st->pcd || audiod_status == AUDIOD_OFF)
1030 return;
1031 if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
1032 < 0)
1033 return;
1034 if (st->clock_diff_count) {
1035 char *argv[] = {"audiod", "stat", "1", NULL};
1036 int argc = 3;
1037 if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
1038 return;
1039 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1040 ret = client_open(argc, argv, &st->pcd);
1041
1042 } else {
1043 char *argv[] = {"audiod", "stat", NULL};
1044 int argc = 2;
1045 ret = client_open(argc, argv, &st->pcd);
1046 }
1047 set_stat_task_restart_barrier();
1048 if (ret < 0)
1049 return;
1050 st->pcd->task.event_handler = client_task_event_handler;
1051 s->timeout.tv_sec = 0;
1052 s->timeout.tv_usec = 1;
1053 }
1054
1055 static void status_post_select(__a_unused struct sched *s, struct task *t)
1056 {
1057 struct status_task *st = t->private_data;
1058 unsigned bytes_left;
1059
1060 t->ret = 1;
1061 if (!st->pcd || st->pcd->status != CL_RECEIVING)
1062 return;
1063 if (st->pcd && audiod_status == AUDIOD_OFF) {
1064 unregister_task(&st->pcd->task);
1065 close_stat_pipe();
1066 st->clock_diff_count = conf.clock_diff_count_arg;
1067 return;
1068 }
1069 bytes_left = for_each_line(st->pcd->buf, st->pcd->loaded,
1070 &check_stat_line, NULL);
1071 if (st->pcd->loaded != bytes_left) {
1072 st->last_status_read = *now;
1073 st->pcd->loaded = bytes_left;
1074 } else {
1075 struct timeval diff;
1076 tv_diff(now, &st->last_status_read, &diff);
1077 if (diff.tv_sec > 61)
1078 close_stat_pipe();
1079 }
1080 }
1081
1082 static void init_status_task(struct status_task *st)
1083 {
1084 memset(st, 0, sizeof(struct status_task));
1085 st->task.pre_select = status_pre_select;
1086 st->task.post_select = status_post_select;
1087 st->task.private_data = st;
1088 st->sa_time_diff_sign = 1;
1089 st->clock_diff_count = conf.clock_diff_count_arg;
1090 st->current_audio_format_num = -1;
1091 sprintf(st->task.status, "status task");
1092 }
1093
1094 static void set_initial_status(void)
1095 {
1096 audiod_status = AUDIOD_ON;
1097 if (!conf.mode_given)
1098 return;
1099 if (!strcmp(conf.mode_arg, "sb")) {
1100 audiod_status = AUDIOD_STANDBY;
1101 return;
1102 }
1103 if (!strcmp(conf.mode_arg, "off")) {
1104 audiod_status = AUDIOD_OFF;
1105 return;
1106 }
1107 if (strcmp(conf.mode_arg, "on"))
1108 PARA_WARNING_LOG("%s", "invalid mode\n");
1109 }
1110
1111 /**
1112 * the main function of para_audiod
1113 *
1114 * \param argc usual argument count
1115 * \param argv usual argument vector
1116 *
1117 * \return EXIT_SUCCESS or EXIT_FAILURE
1118 *
1119 * \sa para_audiod(1)
1120 * */
1121 int main(int argc, char *argv[])
1122 {
1123 char *config_file;
1124 int ret, i;
1125 struct sched s;
1126 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1127 struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1128
1129 valid_fd_012();
1130 audiod_cmdline_parser(argc, argv, &conf);
1131 HANDLE_VERSION_FLAG("audiod", conf);
1132 para_drop_privileges(conf.user_arg, conf.group_arg);
1133 config_file = configfile_exists();
1134 if (config_file) {
1135 struct audiod_cmdline_parser_params params = {
1136 .override = 0,
1137 .initialize = 0,
1138 .check_required = 0,
1139 .check_ambiguity = 0
1140
1141 };
1142 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1143 PARA_EMERG_LOG("%s", "parse error in config file\n");
1144 exit(EXIT_FAILURE);
1145 }
1146 free(config_file);
1147 }
1148 if (conf.logfile_given)
1149 logfile = open_log(conf.logfile_arg);
1150 log_welcome("para_audiod", conf.loglevel_arg);
1151 i = init_stream_io();
1152 if (i < 0) {
1153 PARA_EMERG_LOG("init stream io error: %s\n", para_strerror(-i));
1154 exit(EXIT_FAILURE);
1155 }
1156 server_uptime(UPTIME_SET);
1157 set_initial_status();
1158 FOR_EACH_SLOT(i)
1159 clear_slot(i);
1160 init_grabbing();
1161 setup_signal_handling();
1162 signal_setup_default(sig_task);
1163 sig_task->task.event_handler = signal_event_handler;
1164
1165 init_status_task(stat_task);
1166 init_command_task(cmd_task);
1167 init_audiod_task(audiod_task);
1168
1169 if (conf.daemon_given)
1170 daemon_init();
1171
1172 register_task(&sig_task->task);
1173 register_task(&cmd_task->task);
1174 register_task(&stat_task->task);
1175 register_task(audiod_task);
1176 s.default_timeout.tv_sec = 0;
1177 s.default_timeout.tv_usec = 99 * 1000;
1178 ret = schedule(&s);
1179
1180 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1181 return EXIT_FAILURE;
1182 }