5e0ff8d49f2dec598f1b87c64b1bf421dd9266a6
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2007 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
9 #include "para.h"
10 #include "error.h"
11 #include "audiod.cmdline.h"
12 #include "list.h"
13 #include "sched.h"
14 #include "recv.h"
15 #include "filter.h"
16 #include "grab_client.cmdline.h"
17 #include "grab_client.h"
18 #include "client.cmdline.h"
19 #include "client.h"
20 #include "audiod.h"
21 #include "net.h"
22 #include "daemon.h"
23 #include "string.h"
24 #include "fd.h"
25 #include "write.h"
26 #include "write_common.h"
27 #include "signal.h"
28
29 /** define the array of error lists needed by para_audiod */
30 INIT_AUDIOD_ERRLISTS;
31 /** define the array containing all supported audio formats */
32 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
33
34 /** defines how to handle one supported audio format */
35 struct audio_format_info {
36 /** pointer to the receiver for this audio format */
37 struct receiver *receiver;
38 /** the receiver configuration */
39 void *receiver_conf;
40 /** the number of filters that should be activated for this audio format */
41 unsigned int num_filters;
42 /** pointer to the array of filters to be activated */
43 struct filter **filters;
44 /** pointer to the array of filter configurations */
45 void **filter_conf;
46 /** the number of filters that should be activated for this audio format */
47 unsigned int num_writers;
48 /** pointer to the array of writers to be activated */
49 struct writer **writers;
50 /** pointer to the array of writer configurations */
51 void **writer_conf;
52 /** do not start receiver/filters/writer before this time */
53 struct timeval restart_barrier;
54 };
55
56 /**
57 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
58 * be associated with a receiver/filter/writer triple. This array holds all
59 * information on the status of these slots.
60 *
61 * \sa struct slot_info
62 * */
63 struct slot_info slot[MAX_STREAM_SLOTS];
64
65
66 /**
67 * the current mode of operation of which can be changed by the on/off/cycle
68 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
69 */
70 int audiod_status = AUDIOD_ON;
71
72 /**
73 * the gengetopt args_info struct that holds information on all command line
74 * arguments
75 */
76 struct audiod_args_info conf;
77
78 static char *socket_name;
79 static FILE *logfile;
80 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
81
82 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
83
84 static struct status_task status_task_struct;
85
86 /**
87 * the task that calls the status command of para_server
88 *
89 * \sa struct status_task
90 */
91 struct status_task *stat_task = &status_task_struct;
92 static struct timeval initial_delay_barrier;
93
94 /**
95 * the task for handling audiod commands
96 *
97 * \sa struct task, struct sched
98 */
99 struct command_task {
100 /** the local listening socket */
101 int fd;
102 /** the associated task structure */
103 struct task task;
104 };
105
106 /** iterate over all supported audio formats */
107 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
108
109 /**
110 * get the audio format number
111 * \param name the name of the audio format
112 *
113 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
114 * \a name is not a supported audio format.
115 */
116 int get_audio_format_num(char *name)
117 {
118 int i;
119 FOR_EACH_AUDIO_FORMAT(i)
120 if (!strcmp(name, audio_formats[i]))
121 return i;
122 return -E_UNSUPPORTED_AUDIO_FORMAT;
123 }
124
125 /**
126 * the log function of para_audiod
127 *
128 * \param ll loglevel
129 * \param fmt the format string
130 */
131 void para_log(int ll, const char* fmt,...)
132 {
133 va_list argp;
134 FILE *outfd;
135 struct tm *tm;
136 time_t t1;
137 char str[MAXLINE] = "";
138 static char *hostname;
139
140 if (ll < conf.loglevel_arg)
141 return;
142 if (!hostname)
143 hostname = para_hostname();
144 outfd = logfile? logfile : stderr;
145 time(&t1);
146 tm = localtime(&t1);
147 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
148 fprintf(outfd, "%s %s ", str, hostname);
149 if (conf.loglevel_arg <= INFO)
150 fprintf(outfd, "%i ", ll);
151 va_start(argp, fmt);
152 vfprintf(outfd, fmt, argp);
153 va_end(argp);
154 }
155
156 static char *configfile_exists(void)
157 {
158 char *home = para_homedir();
159 char *config_file = make_message("%s/.paraslash/audiod.conf",
160 home);
161 free(home);
162 if (file_exists(config_file))
163 return config_file;
164 free(config_file);
165 return NULL;
166 }
167
168 static void setup_signal_handling(void)
169 {
170 sig_task->fd = para_signal_init();
171 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
172 para_install_sighandler(SIGINT);
173 para_install_sighandler(SIGTERM);
174 para_install_sighandler(SIGHUP);
175 signal(SIGPIPE, SIG_IGN);
176 }
177
178 static void clear_slot(int slot_num)
179 {
180 struct slot_info *s = &slot[slot_num];
181
182 PARA_INFO_LOG("clearing slot %d\n", slot_num);
183 memset(s, 0, sizeof(struct slot_info));
184 s->format = -1;
185 }
186
187 static void close_receiver(int slot_num)
188 {
189 struct slot_info *s = &slot[slot_num];
190 struct audio_format_info *a;
191
192 if (s->format < 0 || !s->receiver_node)
193 return;
194 a = &afi[s->format];
195 PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
196 audio_formats[s->format] , slot_num, s->receiver_node->eof);
197 a->receiver->close(s->receiver_node);
198 free(s->receiver_node);
199 s->receiver_node = NULL;
200 }
201
202 static void kill_all_decoders(void)
203 {
204 int i;
205
206 FOR_EACH_SLOT(i) {
207 struct slot_info *s = &slot[i];
208 if (s->wng && !s->wng->eof) {
209 PARA_INFO_LOG("unregistering writer node group in slot %d\n",
210 i);
211 wng_unregister(s->wng);
212 s->wng->eof = 1;
213 }
214 if (s->fc && !s->fc->eof) {
215 PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
216 unregister_task(&s->fc->task);
217 s->fc->eof = 1;
218 }
219 if (s->receiver_node && !s->receiver_node->eof) {
220 PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
221 unregister_task(&s->receiver_node->task);
222 s->receiver_node->eof = 1;
223 }
224 }
225 }
226
227 static int get_empty_slot(void)
228 {
229 int i;
230 struct slot_info *s;
231
232 FOR_EACH_SLOT(i) {
233 s = &slot[i];
234 if (s->format < 0) {
235 clear_slot(i);
236 return i;
237 }
238 if (s->wng || s->receiver_node || s->fc)
239 continue;
240 clear_slot(i);
241 return i;
242 }
243 return -E_NO_MORE_SLOTS;
244 }
245
246 /**
247 * get the number of filters
248 *
249 * \param audio_format_num the number identifying the audio format
250 *
251 * \return the number of filters for the given audio format
252 *
253 * \sa struct filter;
254 */
255 int num_filters(int audio_format_num)
256 {
257 return afi[audio_format_num].num_filters;
258 }
259
260 static void filter_event_handler(struct task *t)
261 {
262 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
263 struct filter_chain *fc = t->private_data;
264 fc->eof = 1;
265 unregister_task(t);
266 }
267
268 static void open_filters(int slot_num)
269 {
270 struct slot_info *s = &slot[slot_num];
271 struct audio_format_info *a = &afi[s->format];
272 int nf = a->num_filters;
273 int i;
274
275 s->fc = NULL;
276 if (!nf)
277 return;
278 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
279 s->fc = para_calloc(sizeof(struct filter_chain));
280 INIT_LIST_HEAD(&s->fc->filters);
281 s->fc->inbuf = s->receiver_node->buf;
282 s->fc->in_loaded = &s->receiver_node->loaded;
283 s->fc->input_eof = &s->receiver_node->eof;
284 s->fc->task.pre_select = filter_pre_select;
285 s->fc->task.event_handler = filter_event_handler;
286 s->fc->task.private_data = s->fc;
287 s->fc->eof = 0;
288
289 s->receiver_node->output_eof = &s->fc->eof;
290 sprintf(s->fc->task.status, "filter chain");
291 for (i = 0; i < nf; i++) {
292 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
293 fn->conf = a->filter_conf[i];
294 fn->fc = s->fc;
295 fn->filter = a->filters[i];
296 INIT_LIST_HEAD(&fn->callbacks);
297 list_add_tail(&fn->node, &s->fc->filters);
298 fn->filter->open(fn);
299 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
300 audio_formats[s->format], i + 1, nf,
301 fn->filter->name, slot_num);
302 s->fc->outbuf = fn->buf;
303 s->fc->out_loaded = &fn->loaded;
304 }
305 register_task(&s->fc->task);
306 }
307
308 static void wng_event_handler(struct task *t)
309 {
310 struct writer_node_group *wng = t->private_data;
311
312 PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
313 wng->eof = 1;
314 wng_unregister(wng);
315 }
316
317 static void open_writers(int slot_num)
318 {
319 int ret, i;
320 struct slot_info *s = &slot[slot_num];
321 struct audio_format_info *a = &afi[s->format];
322
323 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
324 if (!a->num_writers)
325 s->wng = setup_default_wng();
326 else
327 s->wng = wng_new(a->num_writers);
328 if (s->fc) {
329 s->wng->buf = s->fc->outbuf;
330 s->wng->loaded = s->fc->out_loaded;
331 s->wng->input_eof = &s->fc->eof;
332 s->wng->channels = &s->fc->channels;
333 s->wng->samplerate = &s->fc->samplerate;
334 s->fc->output_eof = &s->wng->eof;
335 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
336 } else {
337 s->wng->buf = s->receiver_node->buf;
338 s->wng->loaded = &s->receiver_node->loaded;
339 s->wng->input_eof = &s->receiver_node->eof;
340 }
341 s->wng->task.event_handler = wng_event_handler;
342 for (i = 0; i < a->num_writers; i++) {
343 s->wng->writer_nodes[i].conf = a->writer_conf[i];
344 s->wng->writer_nodes[i].writer = a->writers[i];
345 }
346 ret = wng_open(s->wng);
347 if (ret < 0) {
348 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
349 return;
350 }
351 s->wstime = *now;
352 activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
353 }
354
355 static void rn_event_handler(struct task *t)
356 {
357 struct receiver_node *rn = t->private_data;
358 const struct timeval restart_delay = {0, 10 * 1000};
359 int i;
360
361 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
362 unregister_task(t);
363 rn->eof = 1;
364 /* set restart barrier */
365 FOR_EACH_SLOT(i) {
366 if (slot[i].receiver_node != rn)
367 continue;
368 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
369 }
370 }
371
372 static int open_receiver(int format)
373 {
374 struct audio_format_info *a = &afi[format];
375 struct slot_info *s;
376 int ret, slot_num;
377 struct receiver_node *rn;
378 const struct timeval restart_delay = {1, 0};
379
380 ret = get_empty_slot();
381 if (ret < 0)
382 goto err;
383 slot_num = ret;
384 s = &slot[slot_num];
385 s->format = format;
386 s->receiver_node = para_calloc(sizeof(struct receiver_node));
387 rn = s->receiver_node;
388 rn->receiver = a->receiver;
389 rn->conf = a->receiver_conf;
390 ret = a->receiver->open(s->receiver_node);
391 if (ret < 0) {
392 free(s->receiver_node);
393 s->receiver_node = NULL;
394 goto err;
395 }
396 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
397 audio_formats[s->format], a->receiver->name, slot_num);
398 rn->task.private_data = s->receiver_node;
399 rn->task.pre_select = a->receiver->pre_select;
400 rn->task.post_select = a->receiver->post_select;
401 rn->task.event_handler = rn_event_handler;
402 sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
403 register_task(&rn->task);
404 return 1;
405 err:
406 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
407 tv_add(now, &restart_delay, &afi[format].restart_barrier);
408 return ret;
409 }
410
411 static int receiver_running(int format)
412 {
413 int i;
414
415 FOR_EACH_SLOT(i) {
416 struct slot_info *s = &slot[i];
417 if (s->format == format && s->receiver_node
418 && !s->receiver_node->eof)
419 return 1;
420 }
421 return 0;
422 }
423
424 static int open_current_receiver(struct sched *s)
425 {
426 int i;
427 struct timeval diff;
428 char *audio_format = stat_task->stat_item_values[SI_FORMAT];
429
430 if (!audio_format || !stat_task->pcd)
431 return 0;
432 i = get_audio_format_num(audio_format + strlen(
433 status_item_list[SI_FORMAT]) + 1);
434 if (i < 0)
435 return 0;
436 if (receiver_running(i))
437 return 0;
438 if (tv_diff(now, &afi[i].restart_barrier, &diff) < 0) {
439 s->timeout = diff;
440 return 0;
441 }
442 return open_receiver(i) < 0? 0 : 1;
443 }
444
445 static unsigned compute_time_diff(const struct timeval *status_time)
446 {
447 struct timeval tmp, diff;
448 static unsigned count;
449 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
450 const struct timeval max_deviation = {0, 500 * 1000};
451 const int time_smooth = 5;
452
453 if (!status_time)
454 return count;
455 sign = tv_diff(status_time, now, &diff);
456 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
457 // sign, sa_time_diff_sign);
458 if (!count) {
459 sa_time_diff_sign = sign;
460 stat_task->sa_time_diff = diff;
461 count++;
462 goto out;
463 }
464 if (count > 5) {
465 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
466 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
467 PARA_WARNING_LOG("time diff jump: %lims\n",
468 s * tv2ms(&tmp));
469 }
470 count++;
471 sa_time_diff_sign = tv_convex_combination(
472 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
473 count > 10? sign : sign * time_smooth, &diff,
474 &tmp);
475 stat_task->sa_time_diff = tmp;
476 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
477 sign > 0? "+" : "-",
478 tv2ms(&diff),
479 sa_time_diff_sign ? "+" : "-",
480 tv2ms(&stat_task->sa_time_diff)
481 );
482 out:
483 stat_task->sa_time_diff_sign = sa_time_diff_sign;
484 return count;
485 }
486
487 static int check_stat_line(char *line, __a_unused void *data)
488 {
489 int itemnum;
490 size_t ilen = 0;
491 long unsigned sec, usec;
492 char *tmp;
493
494 // PARA_INFO_LOG("line: %s\n", line);
495 if (!line)
496 return 1;
497 itemnum = stat_line_valid(line);
498 if (itemnum < 0) {
499 PARA_WARNING_LOG("invalid status line: %s\n", line);
500 return 1;
501 }
502 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
503 return 1;
504 tmp = make_message("%s\n", line);
505 stat_client_write(tmp, itemnum);
506 free(tmp);
507 free(stat_task->stat_item_values[itemnum]);
508 stat_task->stat_item_values[itemnum] = para_strdup(line);
509 ilen = strlen(status_item_list[itemnum]);
510 switch (itemnum) {
511 case SI_STATUS:
512 stat_task->playing = strstr(line, "playing")? 1 : 0;
513 break;
514 case SI_OFFSET:
515 stat_task->offset_seconds = atoi(line + ilen + 1);
516 break;
517 case SI_LENGTH:
518 stat_task->length_seconds = atoi(line + ilen + 1);
519 break;
520 case SI_STREAM_START:
521 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
522 struct timeval a_start, delay;
523 delay.tv_sec = conf.stream_delay_arg / 1000;
524 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
525 stat_task->server_stream_start.tv_sec = sec;
526 stat_task->server_stream_start.tv_usec = usec;
527 if (compute_time_diff(NULL) > 2) {
528 if (stat_task->sa_time_diff_sign < 0)
529 tv_add(&stat_task->server_stream_start,
530 &stat_task->sa_time_diff, &a_start);
531 else
532 tv_diff(&stat_task->server_stream_start,
533 &stat_task->sa_time_diff, &a_start);
534 tv_add(&a_start, &delay, &initial_delay_barrier);
535 }
536 }
537 break;
538 case SI_CURRENT_TIME:
539 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
540 struct timeval tv = {sec, usec};
541 compute_time_diff(&tv);
542 }
543 if (stat_task->clock_diff_count)
544 stat_task->clock_diff_count--;
545 break;
546 }
547 return 1;
548 }
549
550 static void try_to_close_slot(int slot_num)
551 {
552 struct slot_info *s = &slot[slot_num];
553
554 if (s->format < 0)
555 return;
556 if (s->receiver_node && !s->receiver_node->eof)
557 return;
558 if (s->fc && !s->fc->eof)
559 return;
560 if (s->wng && !s->wng->eof)
561 return;
562 PARA_INFO_LOG("closing slot %d \n", slot_num);
563 wng_close(s->wng);
564 close_filters(s->fc);
565 free(s->fc);
566 close_receiver(slot_num);
567 clear_slot(slot_num);
568 }
569
570 /*
571 * Check if any receivers/filters/writers need to be started and do so if
572 * neccessary. Since the pre_select function didn't have a chance yet to put
573 * file descriptors into the fd sets given by s, make the upcoming select()
574 * return immediately to avoid a long timeout in case we started something.
575 */
576 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
577 {
578 int i;
579 struct timeval min_delay = {0, 1};
580
581 t->ret = 1;
582 if (audiod_status != AUDIOD_ON || !stat_task->playing)
583 return kill_all_decoders();
584 if (open_current_receiver(s))
585 s->timeout = min_delay;
586 FOR_EACH_SLOT(i) {
587 struct slot_info *sl = &slot[i];
588 struct audio_format_info *a;
589 struct timeval diff;
590
591 if (sl->format < 0)
592 continue;
593 a = &afi[sl->format];
594 if (!sl->receiver_node)
595 continue;
596 if (!a->num_filters) {
597 if (sl->receiver_node->loaded && !sl->wng) {
598 open_writers(i);
599 s->timeout = min_delay;
600 }
601 continue;
602 }
603 if (sl->receiver_node->loaded && !sl->fc) {
604 open_filters(i);
605 s->timeout = min_delay;
606 continue;
607 }
608 if (!sl->fc || !*sl->fc->out_loaded || sl->wng)
609 continue;
610 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
611 open_writers(i);
612 s->timeout = min_delay;
613 continue;
614 }
615 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
616 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
617 s->timeout = diff;
618 }
619 }
620 }
621
622 static void audiod_post_select(__a_unused struct sched *s,
623 __a_unused struct task *t)
624 {
625 int i;
626
627 t->ret = 1;
628 FOR_EACH_SLOT(i)
629 try_to_close_slot(i);
630 }
631
632 static void init_audiod_task(struct task *t)
633 {
634 t->pre_select = audiod_pre_select;
635 t->post_select = audiod_post_select;
636 t->event_handler = NULL;
637 t->private_data = t;
638 sprintf(t->status, "audiod task");
639 }
640
641 static int parse_stream_command(const char *txt, char **cmd)
642 {
643 char *p = strchr(txt, ':');
644 int i;
645
646 if (!p)
647 return -E_MISSING_COLON;
648 p++;
649 FOR_EACH_AUDIO_FORMAT(i) {
650 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
651 continue;
652 *cmd = p;
653 return i;
654 }
655 return -E_UNSUPPORTED_AUDIO_FORMAT;
656 }
657
658 static int add_filter(int format, char *cmdline)
659 {
660 struct audio_format_info *a = &afi[format];
661 int filter_num, nf = a->num_filters;
662
663 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
664 if (filter_num < 0)
665 return filter_num;
666 a->filters[nf] = &filters[filter_num];
667 a->num_filters++;
668 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
669 a->filters[nf]->name);
670 return filter_num;
671 }
672
673 static int init_writers(void)
674 {
675 int i, ret, nw;
676 char *cmd;
677 struct audio_format_info *a;
678
679 init_supported_writers();
680 nw = PARA_MAX(1, conf.writer_given);
681 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
682 FOR_EACH_AUDIO_FORMAT(i) {
683 a = &afi[i];
684 a->writer_conf = para_malloc(nw * sizeof(void *));
685 a->writers = para_malloc(nw * sizeof(struct writer *));
686 a->num_writers = 0;
687 }
688 for (i = 0; i < conf.writer_given; i++) {
689 void *wconf;
690 int writer_num;
691 ret = parse_stream_command(conf.writer_arg[i], &cmd);
692 if (ret < 0)
693 goto out;
694 a = &afi[ret];
695 nw = a->num_writers;
696 wconf = check_writer_arg(cmd, &writer_num);
697 if (!wconf) {
698 ret = writer_num;
699 goto out;
700 }
701 a->writers[nw] = &writers[writer_num];
702 a->writer_conf[nw] = wconf;
703 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
704 nw, writer_names[writer_num]);
705 a->num_writers++;
706 }
707 ret = 1;
708 out:
709 return ret;
710 }
711
712 static int init_receivers(void)
713 {
714 int i, ret, receiver_num;
715 char *cmd = NULL;
716 struct audio_format_info *a;
717
718 for (i = 0; receivers[i].name; i++) {
719 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
720 receivers[i].init(&receivers[i]);
721 }
722 for (i = conf.receiver_given - 1; i >= 0; i--) {
723 char *arg = conf.receiver_arg[i];
724 char *recv_arg = strchr(arg, ':');
725 ret = -E_MISSING_COLON;
726 if (!recv_arg)
727 goto out;
728 *recv_arg = '\0';
729 recv_arg++;
730 ret = get_audio_format_num(arg);
731 if (ret < 0)
732 goto out;
733 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
734 if (!afi[ret].receiver_conf) {
735 ret = -E_RECV_SYNTAX;
736 goto out;
737 }
738 afi[ret].receiver = &receivers[receiver_num];
739 }
740 /* use the first available receiver with no arguments
741 * for those audio formats for which no receiver
742 * was specified
743 */
744 cmd = para_strdup(receivers[0].name);
745 FOR_EACH_AUDIO_FORMAT(i) {
746 a = &afi[i];
747 if (a->receiver_conf)
748 continue;
749 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
750 if (!a->receiver_conf)
751 return -E_RECV_SYNTAX;
752 a->receiver = &receivers[receiver_num];
753 }
754 ret = 1;
755 out:
756 free(cmd);
757 return ret;
758 }
759
760 static int init_default_filters(void)
761 {
762 int i, ret = 1;
763
764 FOR_EACH_AUDIO_FORMAT(i) {
765 struct audio_format_info *a = &afi[i];
766 char *tmp;
767 int j;
768
769 if (a->num_filters)
770 continue; /* no default -- nothing to to */
771 /* add "dec" to audio format name */
772 tmp = make_message("%sdec", audio_formats[i]);
773 for (j = 0; filters[j].name; j++)
774 if (!strcmp(tmp, filters[j].name))
775 break;
776 free(tmp);
777 ret = -E_UNSUPPORTED_FILTER;
778 if (!filters[j].name)
779 goto out;
780 tmp = para_strdup(filters[j].name);
781 ret = add_filter(i, tmp);
782 free(tmp);
783 if (ret < 0)
784 goto out;
785 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
786 filters[j].name);
787 }
788 out:
789 return ret;
790 }
791
792 static int init_filters(void)
793 {
794 int i, ret, nf;
795
796 filter_init(filters);
797 nf = PARA_MAX(1, conf.filter_given);
798 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
799 FOR_EACH_AUDIO_FORMAT(i) {
800 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
801 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
802 }
803 if (!conf.no_default_filters_given)
804 return init_default_filters();
805 for (i = 0; i < conf.filter_given; i++) {
806 char *arg = conf.filter_arg[i];
807 char *filter_name = strchr(arg, ':');
808 ret = -E_MISSING_COLON;
809 if (!filter_name)
810 goto out;
811 *filter_name = '\0';
812 filter_name++;
813 ret = get_audio_format_num(arg);
814 if (ret < 0)
815 goto out;
816 ret = add_filter(ret, filter_name);
817 if (ret < 0)
818 goto out;
819 }
820 ret = init_default_filters(); /* use default values for the rest */
821 out:
822 return ret;
823 }
824
825 static int init_stream_io(void)
826 {
827 int ret;
828
829 ret = init_writers();
830 if (ret < 0)
831 return ret;
832 ret = init_receivers();
833 if (ret < 0)
834 return ret;
835 ret = init_filters();
836 if (ret < 0)
837 return ret;
838 return 1;
839 }
840
841 static int audiod_get_socket(void)
842 {
843 struct sockaddr_un unix_addr;
844 int fd;
845
846 if (conf.socket_given)
847 socket_name = para_strdup(conf.socket_arg);
848 else {
849 char *hn = para_hostname();
850 socket_name = make_message("/var/paraslash/audiod_socket.%s",
851 hn);
852 free(hn);
853 }
854 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
855 if (conf.force_given)
856 unlink(socket_name);
857 fd = create_local_socket(socket_name, &unix_addr,
858 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
859 if (fd < 0) {
860 PARA_EMERG_LOG("can not connect to socket\n");
861 exit(EXIT_FAILURE); /* do not unlink socket */
862 }
863 if (listen(fd , 5) < 0) {
864 PARA_EMERG_LOG("can not listen on socket\n");
865 exit(EXIT_FAILURE); /* do not unlink socket */
866 }
867 mark_fd_nonblock(fd);
868 return fd;
869 }
870
871 static void signal_event_handler(struct task *t)
872 {
873 struct signal_task *st = t->private_data;
874
875 switch (st->signum) {
876 case SIGINT:
877 case SIGTERM:
878 case SIGHUP:
879 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
880 clean_exit(EXIT_FAILURE, "caught deadly signal");
881 }
882 }
883
884 static void signal_pre_select(struct sched *s, struct task *t)
885 {
886 struct signal_task *st = t->private_data;
887 t->ret = 1;
888 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
889 }
890
891 static void signal_post_select(struct sched *s, struct task *t)
892 {
893 struct signal_task *st = t->private_data;
894 t->ret = 1;
895 if (!FD_ISSET(st->fd, &s->rfds))
896 return;
897 t->ret = -E_SIGNAL_CAUGHT;
898 st->signum = para_next_signal();
899 }
900
901 static void signal_setup_default(struct signal_task *st)
902 {
903 st->task.pre_select = signal_pre_select;
904 st->task.post_select = signal_post_select;
905 st->task.private_data = st;
906 sprintf(st->task.status, "signal task");
907 }
908
909 static void command_pre_select(struct sched *s, struct task *t)
910 {
911 struct command_task *ct = t->private_data;
912 t->ret = 1;
913 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
914
915 }
916
917 static void command_post_select(struct sched *s, struct task *t)
918 {
919 int ret;
920 struct command_task *ct = t->private_data;
921
922 t->ret = 1; /* always successful */
923 audiod_status_dump();
924 if (!FD_ISSET(ct->fd, &s->rfds))
925 return;
926 ret = handle_connect(ct->fd);
927 if (ret < 0)
928 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
929 }
930
931 static void init_command_task(struct command_task *ct)
932 {
933 ct->task.pre_select = command_pre_select;
934 ct->task.post_select = command_post_select;
935 ct->task.event_handler = NULL;
936 ct->task.private_data = ct;
937 ct->fd = audiod_get_socket(); /* doesn't return on errors */
938 sprintf(ct->task.status, "command task");
939 }
940
941 static void close_stat_pipe(void)
942 {
943 int i;
944
945 if (!stat_task->pcd)
946 return;
947 client_close(stat_task->pcd);
948 stat_task->pcd = NULL;
949 for (i = 0; i < NUM_STAT_ITEMS; i++) {
950 free(stat_task->stat_item_values[i]);
951 stat_task->stat_item_values[i] = NULL;
952 }
953 dump_empty_status();
954 stat_task->length_seconds = 0;
955 stat_task->offset_seconds = 0;
956 audiod_status_dump();
957 stat_task->playing = 0;
958 stat_task->stat_item_values[SI_STATUS_BAR] = make_message(
959 "%s:no connection to para_server\n",
960 status_item_list[SI_STATUS_BAR]);
961 stat_client_write(stat_task->stat_item_values[SI_STATUS_BAR],
962 SI_STATUS_BAR);
963 if (stat_task->clock_diff_count) {
964 stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
965 stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
966 }
967 }
968
969 /**
970 * close the connection to para_server and exit
971 *
972 * \param status the exit status which is passed to exit(3)
973 * \param msg the log message
974 *
975 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
976 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
977 * EXIT_FAILURE.
978 *
979 * \sa exit(3)
980 */
981 void __noreturn clean_exit(int status, const char *msg)
982 {
983 PARA_EMERG_LOG("%s\n", msg);
984 if (socket_name)
985 unlink(socket_name);
986 close_stat_pipe();
987 exit(status);
988 }
989
990 /* avoid busy loop if server is down */
991 static void set_stat_task_restart_barrier(void)
992 {
993 struct timeval delay = {5, 0};
994 tv_add(now, &delay, &stat_task->restart_barrier);
995 }
996
997 static void client_task_event_handler(__a_unused struct task *t)
998 {
999 int i;
1000
1001 if (t->ret == -E_HANDSHAKE_COMPLETE)
1002 return;
1003 unregister_task(t);
1004 close_stat_pipe();
1005 if (t->ret != -E_SERVER_EOF)
1006 stat_task->clock_diff_count = conf.clock_diff_count_arg;
1007 set_stat_task_restart_barrier();
1008 FOR_EACH_AUDIO_FORMAT(i)
1009 afi[i].restart_barrier = stat_task->restart_barrier;
1010 }
1011
1012 static void status_pre_select(struct sched *s, struct task *t)
1013 {
1014 struct status_task *st = t->private_data;
1015 int ret;
1016
1017 t->ret = 1; /* always successful */
1018 if (st->pcd || audiod_status == AUDIOD_OFF)
1019 return;
1020 if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
1021 < 0)
1022 return;
1023 if (st->clock_diff_count) {
1024 char *argv[] = {"audiod", "stat", "1", NULL};
1025 int argc = 3;
1026 if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
1027 return;
1028 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1029 ret = client_open(argc, argv, &st->pcd);
1030
1031 } else {
1032 char *argv[] = {"audiod", "stat", NULL};
1033 int argc = 2;
1034 ret = client_open(argc, argv, &st->pcd);
1035 }
1036 set_stat_task_restart_barrier();
1037 if (ret < 0)
1038 return;
1039 st->pcd->task.event_handler = client_task_event_handler;
1040 s->timeout.tv_sec = 0;
1041 s->timeout.tv_usec = 1;
1042 }
1043
1044 static void status_post_select(__a_unused struct sched *s, struct task *t)
1045 {
1046 struct status_task *st = t->private_data;
1047 unsigned bytes_left;
1048
1049 t->ret = 1;
1050 if (!st->pcd || st->pcd->status != CL_RECEIVING)
1051 return;
1052 if (st->pcd && audiod_status == AUDIOD_OFF) {
1053 unregister_task(&st->pcd->task);
1054 close_stat_pipe();
1055 st->clock_diff_count = conf.clock_diff_count_arg;
1056 return;
1057 }
1058 bytes_left = for_each_line(st->pcd->buf, st->pcd->loaded,
1059 &check_stat_line, NULL);
1060 if (st->pcd->loaded != bytes_left) {
1061 st->last_status_read = *now;
1062 st->pcd->loaded = bytes_left;
1063 } else {
1064 struct timeval diff;
1065 tv_diff(now, &st->last_status_read, &diff);
1066 if (diff.tv_sec > 61)
1067 close_stat_pipe();
1068 }
1069 }
1070
1071 static void init_status_task(struct status_task *st)
1072 {
1073 memset(st, 0, sizeof(struct status_task));
1074 st->task.pre_select = status_pre_select;
1075 st->task.post_select = status_post_select;
1076 st->task.private_data = st;
1077 st->sa_time_diff_sign = 1;
1078 st->clock_diff_count = conf.clock_diff_count_arg;
1079 sprintf(st->task.status, "status task");
1080 }
1081
1082 static void set_initial_status(void)
1083 {
1084 audiod_status = AUDIOD_ON;
1085 if (!conf.mode_given)
1086 return;
1087 if (!strcmp(conf.mode_arg, "sb")) {
1088 audiod_status = AUDIOD_STANDBY;
1089 return;
1090 }
1091 if (!strcmp(conf.mode_arg, "off")) {
1092 audiod_status = AUDIOD_OFF;
1093 return;
1094 }
1095 if (strcmp(conf.mode_arg, "on"))
1096 PARA_WARNING_LOG("%s", "invalid mode\n");
1097 }
1098
1099 /**
1100 * the main function of para_audiod
1101 *
1102 * \param argc usual argument count
1103 * \param argv usual argument vector
1104 *
1105 * \return EXIT_SUCCESS or EXIT_FAILURE
1106 *
1107 * \sa para_audiod(1)
1108 * */
1109 int main(int argc, char *argv[])
1110 {
1111 char *config_file;
1112 int ret, i;
1113 struct sched s;
1114 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1115 struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1116
1117 valid_fd_012();
1118 audiod_cmdline_parser(argc, argv, &conf);
1119 HANDLE_VERSION_FLAG("audiod", conf);
1120 para_drop_privileges(conf.user_arg, conf.group_arg);
1121 config_file = configfile_exists();
1122 if (config_file) {
1123 struct audiod_cmdline_parser_params params = {
1124 .override = 0,
1125 .initialize = 0,
1126 .check_required = 0,
1127 .check_ambiguity = 0
1128
1129 };
1130 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1131 PARA_EMERG_LOG("%s", "parse error in config file\n");
1132 exit(EXIT_FAILURE);
1133 }
1134 free(config_file);
1135 }
1136 if (conf.logfile_given)
1137 logfile = open_log(conf.logfile_arg);
1138 log_welcome("para_audiod", conf.loglevel_arg);
1139 i = init_stream_io();
1140 if (i < 0) {
1141 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1142 exit(EXIT_FAILURE);
1143 }
1144 server_uptime(UPTIME_SET);
1145 set_initial_status();
1146 FOR_EACH_SLOT(i)
1147 clear_slot(i);
1148 init_grabbing();
1149 setup_signal_handling();
1150 signal_setup_default(sig_task);
1151 sig_task->task.event_handler = signal_event_handler;
1152
1153 init_status_task(stat_task);
1154 init_command_task(cmd_task);
1155 init_audiod_task(audiod_task);
1156
1157 if (conf.daemon_given)
1158 daemon_init();
1159
1160 register_task(&sig_task->task);
1161 register_task(&cmd_task->task);
1162 register_task(&stat_task->task);
1163 register_task(audiod_task);
1164 s.default_timeout.tv_sec = 0;
1165 s.default_timeout.tv_usec = 99 * 1000;
1166 ret = sched(&s);
1167
1168 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1169 return EXIT_FAILURE;
1170 }