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