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