Merge the new afs code.
[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
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 "error.h"
28 #include "signal.h"
29
30 /** define the array of error lists needed by para_audiod */
31 INIT_AUDIOD_ERRLISTS;
32 /** define the array containing all supported audio formats */
33 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
34
35 /** defines how to handle one supported audio format */
36 struct audio_format_info {
37 /** pointer to the receiver for this audio format */
38 struct receiver *receiver;
39 /** the receiver configuration */
40 void *receiver_conf;
41 /** the number of filters that should be activated for this audio format */
42 unsigned int num_filters;
43 /** pointer to the array of filters to be activated */
44 struct filter **filters;
45 /** pointer to the array of filter configurations */
46 void **filter_conf;
47 /** the number of filters that should be activated for this audio format */
48 unsigned int num_writers;
49 /** pointer to the array of writers to be activated */
50 struct writer **writers;
51 /** pointer to the array of writer configurations */
52 void **writer_conf;
53 /** do not start receiver/filters/writer before this time */
54 struct timeval restart_barrier;
55 };
56
57 /**
58 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
59 * be associated with a receiver/filter/writer triple. This array holds all
60 * information on the status of these slots.
61 *
62 * \sa struct slot_info
63 * */
64 struct slot_info slot[MAX_STREAM_SLOTS];
65
66
67 /**
68 * the current mode of operation of which can be changed by the on/off/cycle
69 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
70 */
71 int audiod_status = AUDIOD_ON;
72
73 /**
74 * the gengetopt args_info struct that holds information on all command line
75 * arguments
76 */
77 struct audiod_args_info conf;
78
79 static char *socket_name;
80 static FILE *logfile;
81 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
82
83 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
84
85 static struct status_task status_task_struct;
86
87 /**
88 * the task that calls the status command of para_server
89 *
90 * \sa struct status_task
91 */
92 struct status_task *stat_task = &status_task_struct;
93 static struct timeval initial_delay_barrier;
94
95 /**
96 * the task for handling audiod commands
97 *
98 * \sa struct task, struct sched
99 */
100 struct command_task {
101 /** the local listening socket */
102 int fd;
103 /** the associated task structure */
104 struct task task;
105 };
106
107 /**
108 * task for signal handling
109 */
110 struct signal_task {
111 /** the signal pipe */
112 int fd;
113 /** the number of the most recent signal */
114 int signum;
115 /** the associated task structure */
116 struct task task;
117 };
118
119 /** iterate over all supported audio formats */
120 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
121
122 /**
123 * get the audio format number
124 * \param name the name of the audio format
125 *
126 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
127 * \a name is not a supported audio format.
128 */
129 int get_audio_format_num(char *name)
130 {
131 int i;
132 FOR_EACH_AUDIO_FORMAT(i)
133 if (!strcmp(name, audio_formats[i]))
134 return i;
135 return -E_UNSUPPORTED_AUDIO_FORMAT;
136 }
137
138 /**
139 * the log function of para_audiod
140 *
141 * \param ll loglevel
142 * \param fmt the format string
143 */
144 void para_log(int ll, const char* fmt,...)
145 {
146 va_list argp;
147 FILE *outfd;
148 struct tm *tm;
149 time_t t1;
150 char str[MAXLINE] = "";
151 static char *hostname;
152
153 if (ll < conf.loglevel_arg)
154 return;
155 if (!hostname)
156 hostname = para_hostname();
157 outfd = logfile? logfile : stderr;
158 time(&t1);
159 tm = localtime(&t1);
160 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
161 fprintf(outfd, "%s %s ", str, hostname);
162 if (conf.loglevel_arg <= INFO)
163 fprintf(outfd, "%i ", ll);
164 va_start(argp, fmt);
165 vfprintf(outfd, fmt, argp);
166 va_end(argp);
167 }
168
169 static char *configfile_exists(void)
170 {
171 char *home = para_homedir();
172 char *config_file = make_message("%s/.paraslash/audiod.conf",
173 home);
174 free(home);
175 if (file_exists(config_file))
176 return config_file;
177 free(config_file);
178 return NULL;
179 }
180
181 static void setup_signal_handling(void)
182 {
183 sig_task->fd = para_signal_init();
184 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
185 para_install_sighandler(SIGINT);
186 para_install_sighandler(SIGTERM);
187 para_install_sighandler(SIGHUP);
188 signal(SIGPIPE, SIG_IGN);
189 }
190
191 static void clear_slot(int slot_num)
192 {
193 struct slot_info *s = &slot[slot_num];
194
195 PARA_INFO_LOG("clearing slot %d\n", slot_num);
196 memset(s, 0, sizeof(struct slot_info));
197 s->format = -1;
198 }
199
200 static void close_receiver(int slot_num)
201 {
202 struct slot_info *s = &slot[slot_num];
203 struct audio_format_info *a;
204
205 if (s->format < 0 || !s->receiver_node)
206 return;
207 a = &afi[s->format];
208 PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
209 audio_formats[s->format] , slot_num, s->receiver_node->eof);
210 a->receiver->close(s->receiver_node);
211 free(s->receiver_node);
212 s->receiver_node = NULL;
213 }
214
215 static void kill_all_decoders(void)
216 {
217 int i;
218
219 FOR_EACH_SLOT(i) {
220 struct slot_info *s = &slot[i];
221 if (s->wng && !s->wng->eof) {
222 PARA_INFO_LOG("unregistering writer node group in slot %d\n",
223 i);
224 wng_unregister(s->wng);
225 s->wng->eof = 1;
226 }
227 if (s->fc && !s->fc->eof) {
228 PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
229 unregister_task(&s->fc->task);
230 s->fc->eof = 1;
231 }
232 if (s->receiver_node && !s->receiver_node->eof) {
233 PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
234 unregister_task(&s->receiver_node->task);
235 s->receiver_node->eof = 1;
236 }
237 }
238 }
239
240 static int get_empty_slot(void)
241 {
242 int i;
243 struct slot_info *s;
244
245 FOR_EACH_SLOT(i) {
246 s = &slot[i];
247 if (s->format < 0) {
248 clear_slot(i);
249 return i;
250 }
251 if (s->wng || s->receiver_node || s->fc)
252 continue;
253 clear_slot(i);
254 return i;
255 }
256 return -E_NO_MORE_SLOTS;
257 }
258
259 /**
260 * get the number of filters
261 *
262 * \param audio_format_num the number identifying the audio format
263 *
264 * \return the number of filters for the given audio format
265 *
266 * \sa struct filter;
267 */
268 int num_filters(int audio_format_num)
269 {
270 return afi[audio_format_num].num_filters;
271 }
272
273 static void filter_event_handler(struct task *t)
274 {
275 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
276 struct filter_chain *fc = t->private_data;
277 fc->eof = 1;
278 unregister_task(t);
279 }
280
281 static void open_filters(int slot_num)
282 {
283 struct slot_info *s = &slot[slot_num];
284 struct audio_format_info *a = &afi[s->format];
285 int nf = a->num_filters;
286 int i;
287
288 s->fc = NULL;
289 if (!nf)
290 return;
291 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
292 s->fc = para_calloc(sizeof(struct filter_chain));
293 INIT_LIST_HEAD(&s->fc->filters);
294 s->fc->inbuf = s->receiver_node->buf;
295 s->fc->in_loaded = &s->receiver_node->loaded;
296 s->fc->input_eof = &s->receiver_node->eof;
297 s->fc->task.pre_select = filter_pre_select;
298 s->fc->task.event_handler = filter_event_handler;
299 s->fc->task.private_data = s->fc;
300 s->fc->eof = 0;
301
302 s->receiver_node->output_eof = &s->fc->eof;
303 sprintf(s->fc->task.status, "filter chain");
304 for (i = 0; i < nf; i++) {
305 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
306 fn->conf = a->filter_conf[i];
307 fn->fc = s->fc;
308 fn->filter = a->filters[i];
309 INIT_LIST_HEAD(&fn->callbacks);
310 list_add_tail(&fn->node, &s->fc->filters);
311 fn->filter->open(fn);
312 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
313 audio_formats[s->format], i + 1, nf,
314 fn->filter->name, slot_num);
315 s->fc->outbuf = fn->buf;
316 s->fc->out_loaded = &fn->loaded;
317 }
318 register_task(&s->fc->task);
319 }
320
321 static void wng_event_handler(struct task *t)
322 {
323 struct writer_node_group *wng = t->private_data;
324
325 PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
326 wng->eof = 1;
327 wng_unregister(wng);
328 }
329
330 static void open_writers(int slot_num)
331 {
332 int ret, i;
333 struct slot_info *s = &slot[slot_num];
334 struct audio_format_info *a = &afi[s->format];
335
336 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
337 if (!a->num_writers)
338 s->wng = setup_default_wng();
339 else
340 s->wng = wng_new(a->num_writers);
341 if (s->fc) {
342 s->wng->buf = s->fc->outbuf;
343 s->wng->loaded = s->fc->out_loaded;
344 s->wng->input_eof = &s->fc->eof;
345 s->wng->channels = &s->fc->channels;
346 s->wng->samplerate = &s->fc->samplerate;
347 s->fc->output_eof = &s->wng->eof;
348 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
349 } else {
350 s->wng->buf = s->receiver_node->buf;
351 s->wng->loaded = &s->receiver_node->loaded;
352 s->wng->input_eof = &s->receiver_node->eof;
353 }
354 s->wng->task.event_handler = wng_event_handler;
355 for (i = 0; i < a->num_writers; i++) {
356 s->wng->writer_nodes[i].conf = a->writer_conf[i];
357 s->wng->writer_nodes[i].writer = a->writers[i];
358 }
359 ret = wng_open(s->wng);
360 if (ret < 0) {
361 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
362 return;
363 }
364 s->wstime = *now;
365 activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
366 }
367
368 static void rn_event_handler(struct task *t)
369 {
370 struct receiver_node *rn = t->private_data;
371 const struct timeval restart_delay = {0, 10 * 1000};
372 int i;
373
374 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
375 unregister_task(t);
376 rn->eof = 1;
377 /* set restart barrier */
378 FOR_EACH_SLOT(i) {
379 if (slot[i].receiver_node != rn)
380 continue;
381 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
382 }
383 }
384
385 static int open_receiver(int format)
386 {
387 struct audio_format_info *a = &afi[format];
388 struct slot_info *s;
389 int ret, slot_num;
390 struct receiver_node *rn;
391 const struct timeval restart_delay = {1, 0};
392
393 ret = get_empty_slot();
394 if (ret < 0)
395 goto err;
396 slot_num = ret;
397 s = &slot[slot_num];
398 s->format = format;
399 s->receiver_node = para_calloc(sizeof(struct receiver_node));
400 rn = s->receiver_node;
401 rn->receiver = a->receiver;
402 rn->conf = a->receiver_conf;
403 ret = a->receiver->open(s->receiver_node);
404 if (ret < 0) {
405 free(s->receiver_node);
406 s->receiver_node = NULL;
407 goto err;
408 }
409 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
410 audio_formats[s->format], a->receiver->name, slot_num);
411 rn->task.private_data = s->receiver_node;
412 rn->task.pre_select = a->receiver->pre_select;
413 rn->task.post_select = a->receiver->post_select;
414 rn->task.event_handler = rn_event_handler;
415 sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
416 register_task(&rn->task);
417 return 1;
418 err:
419 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
420 tv_add(now, &restart_delay, &afi[format].restart_barrier);
421 return ret;
422 }
423
424 static int receiver_running(int format)
425 {
426 int i;
427
428 FOR_EACH_SLOT(i) {
429 struct slot_info *s = &slot[i];
430 if (s->format == format && s->receiver_node
431 && !s->receiver_node->eof)
432 return 1;
433 }
434 return 0;
435 }
436
437 static int open_current_receiver(struct sched *s)
438 {
439 int i;
440 struct timeval diff;
441 char *audio_format = stat_task->stat_item_values[SI_FORMAT];
442
443 if (!audio_format || !stat_task->pcd)
444 return 0;
445 i = get_audio_format_num(audio_format + strlen(
446 status_item_list[SI_FORMAT]) + 1);
447 if (i < 0)
448 return 0;
449 if (receiver_running(i))
450 return 0;
451 if (tv_diff(now, &afi[i].restart_barrier, &diff) < 0) {
452 s->timeout = diff;
453 return 0;
454 }
455 return open_receiver(i) < 0? 0 : 1;
456 }
457
458 static unsigned compute_time_diff(const struct timeval *status_time)
459 {
460 struct timeval tmp, diff;
461 static unsigned count;
462 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
463 const struct timeval max_deviation = {0, 500 * 1000};
464 const int time_smooth = 5;
465
466 if (!status_time)
467 return count;
468 sign = tv_diff(status_time, now, &diff);
469 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
470 // sign, sa_time_diff_sign);
471 if (!count) {
472 sa_time_diff_sign = sign;
473 stat_task->sa_time_diff = diff;
474 count++;
475 goto out;
476 }
477 if (count > 5) {
478 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
479 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
480 PARA_WARNING_LOG("time diff jump: %lims\n",
481 s * tv2ms(&tmp));
482 }
483 count++;
484 sa_time_diff_sign = tv_convex_combination(
485 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
486 count > 10? sign : sign * time_smooth, &diff,
487 &tmp);
488 stat_task->sa_time_diff = tmp;
489 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
490 sign > 0? "+" : "-",
491 tv2ms(&diff),
492 sa_time_diff_sign ? "+" : "-",
493 tv2ms(&stat_task->sa_time_diff)
494 );
495 out:
496 stat_task->sa_time_diff_sign = sa_time_diff_sign;
497 return count;
498 }
499
500 static int check_stat_line(char *line, __a_unused void *data)
501 {
502 int itemnum;
503 size_t ilen = 0;
504 long unsigned sec, usec;
505 char *tmp;
506
507 // PARA_INFO_LOG("line: %s\n", line);
508 if (!line)
509 return 1;
510 itemnum = stat_line_valid(line);
511 if (itemnum < 0) {
512 PARA_WARNING_LOG("invalid status line: %s\n", line);
513 return 1;
514 }
515 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
516 return 1;
517 tmp = make_message("%s\n", line);
518 stat_client_write(tmp, itemnum);
519 free(tmp);
520 free(stat_task->stat_item_values[itemnum]);
521 stat_task->stat_item_values[itemnum] = para_strdup(line);
522 ilen = strlen(status_item_list[itemnum]);
523 switch (itemnum) {
524 case SI_STATUS:
525 stat_task->playing = strstr(line, "playing")? 1 : 0;
526 break;
527 case SI_OFFSET:
528 stat_task->offset_seconds = atoi(line + ilen + 1);
529 break;
530 case SI_LENGTH:
531 stat_task->length_seconds = atoi(line + ilen + 1);
532 break;
533 case SI_STREAM_START:
534 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
535 struct timeval a_start, delay;
536 delay.tv_sec = conf.stream_delay_arg / 1000;
537 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
538 stat_task->server_stream_start.tv_sec = sec;
539 stat_task->server_stream_start.tv_usec = usec;
540 if (compute_time_diff(NULL) > 2) {
541 if (stat_task->sa_time_diff_sign < 0)
542 tv_add(&stat_task->server_stream_start,
543 &stat_task->sa_time_diff, &a_start);
544 else
545 tv_diff(&stat_task->server_stream_start,
546 &stat_task->sa_time_diff, &a_start);
547 tv_add(&a_start, &delay, &initial_delay_barrier);
548 }
549 }
550 break;
551 case SI_CURRENT_TIME:
552 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
553 struct timeval tv = {sec, usec};
554 compute_time_diff(&tv);
555 }
556 if (stat_task->clock_diff_count)
557 stat_task->clock_diff_count--;
558 break;
559 }
560 return 1;
561 }
562
563 static void try_to_close_slot(int slot_num)
564 {
565 struct slot_info *s = &slot[slot_num];
566
567 if (s->format < 0)
568 return;
569 if (s->receiver_node && !s->receiver_node->eof)
570 return;
571 if (s->fc && !s->fc->eof)
572 return;
573 if (s->wng && !s->wng->eof)
574 return;
575 PARA_INFO_LOG("closing slot %d \n", slot_num);
576 wng_close(s->wng);
577 close_filters(s->fc);
578 free(s->fc);
579 close_receiver(slot_num);
580 clear_slot(slot_num);
581 }
582
583 /*
584 * Check if any receivers/filters/writers need to be started and do so if
585 * neccessary. Since the pre_select function didn't have a chance yet to put
586 * file descriptors into the fd sets given by s, make the upcoming select()
587 * return immediately to avoid a long timeout in case we started something.
588 */
589 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
590 {
591 int i;
592 struct timeval min_delay = {0, 1};
593
594 t->ret = 1;
595 if (audiod_status != AUDIOD_ON || !stat_task->playing)
596 return kill_all_decoders();
597 if (open_current_receiver(s))
598 s->timeout = min_delay;
599 FOR_EACH_SLOT(i) {
600 struct slot_info *sl = &slot[i];
601 struct audio_format_info *a;
602 struct timeval diff;
603
604 if (sl->format < 0)
605 continue;
606 a = &afi[sl->format];
607 if (!sl->receiver_node)
608 continue;
609 if (!a->num_filters) {
610 if (sl->receiver_node->loaded && !sl->wng) {
611 open_writers(i);
612 s->timeout = min_delay;
613 }
614 continue;
615 }
616 if (sl->receiver_node->loaded && !sl->fc) {
617 open_filters(i);
618 s->timeout = min_delay;
619 continue;
620 }
621 if (!sl->fc || !*sl->fc->out_loaded || sl->wng)
622 continue;
623 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
624 open_writers(i);
625 s->timeout = min_delay;
626 continue;
627 }
628 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
629 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
630 s->timeout = diff;
631 }
632 }
633 }
634
635 static void audiod_post_select(__a_unused struct sched *s,
636 __a_unused struct task *t)
637 {
638 int i;
639
640 t->ret = 1;
641 FOR_EACH_SLOT(i)
642 try_to_close_slot(i);
643 }
644
645 static void init_audiod_task(struct task *t)
646 {
647 t->pre_select = audiod_pre_select;
648 t->post_select = audiod_post_select;
649 t->event_handler = NULL;
650 t->private_data = t;
651 sprintf(t->status, "audiod task");
652 }
653
654 static int parse_stream_command(const char *txt, char **cmd)
655 {
656 char *p = strchr(txt, ':');
657 int i;
658
659 if (!p)
660 return -E_MISSING_COLON;
661 p++;
662 FOR_EACH_AUDIO_FORMAT(i) {
663 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
664 continue;
665 *cmd = p;
666 return i;
667 }
668 return -E_UNSUPPORTED_AUDIO_FORMAT;
669 }
670
671 static int add_filter(int format, char *cmdline)
672 {
673 struct audio_format_info *a = &afi[format];
674 int filter_num, nf = a->num_filters;
675
676 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
677 if (filter_num < 0)
678 return filter_num;
679 a->filters[nf] = &filters[filter_num];
680 a->num_filters++;
681 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
682 a->filters[nf]->name);
683 return filter_num;
684 }
685
686 static int init_writers(void)
687 {
688 int i, ret, nw;
689 char *cmd;
690 struct audio_format_info *a;
691
692 init_supported_writers();
693 nw = PARA_MAX(1, conf.writer_given);
694 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
695 FOR_EACH_AUDIO_FORMAT(i) {
696 a = &afi[i];
697 a->writer_conf = para_malloc(nw * sizeof(void *));
698 a->writers = para_malloc(nw * sizeof(struct writer *));
699 a->num_writers = 0;
700 }
701 for (i = 0; i < conf.writer_given; i++) {
702 void *wconf;
703 int writer_num;
704 ret = parse_stream_command(conf.writer_arg[i], &cmd);
705 if (ret < 0)
706 goto out;
707 a = &afi[ret];
708 nw = a->num_writers;
709 wconf = check_writer_arg(cmd, &writer_num);
710 if (!wconf) {
711 ret = writer_num;
712 goto out;
713 }
714 a->writers[nw] = &writers[writer_num];
715 a->writer_conf[nw] = wconf;
716 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
717 nw, writer_names[writer_num]);
718 a->num_writers++;
719 }
720 ret = 1;
721 out:
722 return ret;
723 }
724
725 static int init_receivers(void)
726 {
727 int i, ret, receiver_num;
728 char *cmd = NULL;
729 struct audio_format_info *a;
730
731 for (i = 0; receivers[i].name; i++) {
732 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
733 receivers[i].init(&receivers[i]);
734 }
735 for (i = conf.receiver_given - 1; i >= 0; i--) {
736 char *arg = conf.receiver_arg[i];
737 char *recv_arg = strchr(arg, ':');
738 ret = -E_MISSING_COLON;
739 if (!recv_arg)
740 goto out;
741 *recv_arg = '\0';
742 recv_arg++;
743 ret = get_audio_format_num(arg);
744 if (ret < 0)
745 goto out;
746 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
747 if (!afi[ret].receiver_conf) {
748 ret = -E_RECV_SYNTAX;
749 goto out;
750 }
751 afi[ret].receiver = &receivers[receiver_num];
752 }
753 /* use the first available receiver with no arguments
754 * for those audio formats for which no receiver
755 * was specified
756 */
757 cmd = para_strdup(receivers[0].name);
758 FOR_EACH_AUDIO_FORMAT(i) {
759 a = &afi[i];
760 if (a->receiver_conf)
761 continue;
762 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
763 if (!a->receiver_conf)
764 return -E_RECV_SYNTAX;
765 a->receiver = &receivers[receiver_num];
766 }
767 ret = 1;
768 out:
769 free(cmd);
770 return ret;
771 }
772
773 static int init_default_filters(void)
774 {
775 int i, ret = 1;
776
777 FOR_EACH_AUDIO_FORMAT(i) {
778 struct audio_format_info *a = &afi[i];
779 char *tmp;
780 int j;
781
782 if (a->num_filters)
783 continue; /* no default -- nothing to to */
784 /* add "dec" to audio format name */
785 tmp = make_message("%sdec", audio_formats[i]);
786 for (j = 0; filters[j].name; j++)
787 if (!strcmp(tmp, filters[j].name))
788 break;
789 free(tmp);
790 ret = -E_UNSUPPORTED_FILTER;
791 if (!filters[j].name)
792 goto out;
793 tmp = para_strdup(filters[j].name);
794 ret = add_filter(i, tmp);
795 free(tmp);
796 if (ret < 0)
797 goto out;
798 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
799 filters[j].name);
800 }
801 out:
802 return ret;
803 }
804
805 static int init_filters(void)
806 {
807 int i, ret, nf;
808
809 filter_init(filters);
810 nf = PARA_MAX(1, conf.filter_given);
811 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
812 FOR_EACH_AUDIO_FORMAT(i) {
813 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
814 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
815 }
816 if (!conf.no_default_filters_given)
817 return init_default_filters();
818 for (i = 0; i < conf.filter_given; i++) {
819 char *arg = conf.filter_arg[i];
820 char *filter_name = strchr(arg, ':');
821 ret = -E_MISSING_COLON;
822 if (!filter_name)
823 goto out;
824 *filter_name = '\0';
825 filter_name++;
826 ret = get_audio_format_num(arg);
827 if (ret < 0)
828 goto out;
829 ret = add_filter(ret, filter_name);
830 if (ret < 0)
831 goto out;
832 }
833 ret = init_default_filters(); /* use default values for the rest */
834 out:
835 return ret;
836 }
837
838 static int init_stream_io(void)
839 {
840 int ret;
841
842 ret = init_writers();
843 if (ret < 0)
844 return ret;
845 ret = init_receivers();
846 if (ret < 0)
847 return ret;
848 ret = init_filters();
849 if (ret < 0)
850 return ret;
851 return 1;
852 }
853
854 static int audiod_get_socket(void)
855 {
856 struct sockaddr_un unix_addr;
857 int fd;
858
859 if (conf.socket_given)
860 socket_name = para_strdup(conf.socket_arg);
861 else {
862 char *hn = para_hostname();
863 socket_name = make_message("/var/paraslash/audiod_socket.%s",
864 hn);
865 free(hn);
866 }
867 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
868 if (conf.force_given)
869 unlink(socket_name);
870 fd = create_local_socket(socket_name, &unix_addr,
871 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
872 if (fd < 0) {
873 PARA_EMERG_LOG("can not connect to socket\n");
874 exit(EXIT_FAILURE); /* do not unlink socket */
875 }
876 if (listen(fd , 5) < 0) {
877 PARA_EMERG_LOG("can not listen on socket\n");
878 exit(EXIT_FAILURE); /* do not unlink socket */
879 }
880 mark_fd_nonblock(fd);
881 return fd;
882 }
883
884 static void signal_event_handler(struct task *t)
885 {
886 struct signal_task *st = t->private_data;
887
888 switch (st->signum) {
889 case SIGINT:
890 case SIGTERM:
891 case SIGHUP:
892 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
893 clean_exit(EXIT_FAILURE, "caught deadly signal");
894 }
895 }
896
897 static void signal_pre_select(struct sched *s, struct task *t)
898 {
899 struct signal_task *st = t->private_data;
900 t->ret = 1;
901 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
902 }
903
904 static void signal_post_select(struct sched *s, struct task *t)
905 {
906 struct signal_task *st = t->private_data;
907 t->ret = 1;
908 if (!FD_ISSET(st->fd, &s->rfds))
909 return;
910 t->ret = -E_SIGNAL_CAUGHT;
911 st->signum = para_next_signal();
912 }
913
914 static void signal_setup_default(struct signal_task *st)
915 {
916 st->task.pre_select = signal_pre_select;
917 st->task.post_select = signal_post_select;
918 st->task.private_data = st;
919 sprintf(st->task.status, "signal task");
920 }
921
922 static void command_pre_select(struct sched *s, struct task *t)
923 {
924 struct command_task *ct = t->private_data;
925 t->ret = 1;
926 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
927
928 }
929
930 static void command_post_select(struct sched *s, struct task *t)
931 {
932 int ret;
933 struct command_task *ct = t->private_data;
934
935 t->ret = 1; /* always successful */
936 audiod_status_dump();
937 if (!FD_ISSET(ct->fd, &s->rfds))
938 return;
939 ret = handle_connect(ct->fd);
940 if (ret < 0)
941 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
942 }
943
944 static void init_command_task(struct command_task *ct)
945 {
946 ct->task.pre_select = command_pre_select;
947 ct->task.post_select = command_post_select;
948 ct->task.event_handler = NULL;
949 ct->task.private_data = ct;
950 ct->fd = audiod_get_socket(); /* doesn't return on errors */
951 sprintf(ct->task.status, "command task");
952 }
953
954 static void close_stat_pipe(void)
955 {
956 int i;
957
958 if (!stat_task->pcd)
959 return;
960 client_close(stat_task->pcd);
961 stat_task->pcd = NULL;
962 for (i = 0; i < NUM_STAT_ITEMS; i++) {
963 free(stat_task->stat_item_values[i]);
964 stat_task->stat_item_values[i] = NULL;
965 }
966 dump_empty_status();
967 stat_task->length_seconds = 0;
968 stat_task->offset_seconds = 0;
969 audiod_status_dump();
970 stat_task->playing = 0;
971 stat_task->stat_item_values[SI_STATUS_BAR] = make_message(
972 "%s:no connection to para_server\n",
973 status_item_list[SI_STATUS_BAR]);
974 stat_client_write(stat_task->stat_item_values[SI_STATUS_BAR],
975 SI_STATUS_BAR);
976 if (stat_task->clock_diff_count) {
977 stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
978 stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
979 }
980 }
981
982 /**
983 * close the connection to para_server and exit
984 *
985 * \param status the exit status which is passed to exit(3)
986 * \param msg the log message
987 *
988 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
989 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
990 * EXIT_FAILURE.
991 *
992 * \sa exit(3)
993 */
994 void __noreturn clean_exit(int status, const char *msg)
995 {
996 PARA_EMERG_LOG("%s\n", msg);
997 if (socket_name)
998 unlink(socket_name);
999 close_stat_pipe();
1000 exit(status);
1001 }
1002
1003 /* avoid busy loop if server is down */
1004 static void set_stat_task_restart_barrier(void)
1005 {
1006 struct timeval delay = {5, 0};
1007 tv_add(now, &delay, &stat_task->restart_barrier);
1008 }
1009
1010 static void client_task_event_handler(__a_unused struct task *t)
1011 {
1012 int i;
1013
1014 if (t->ret == -E_HANDSHAKE_COMPLETE)
1015 return;
1016 unregister_task(t);
1017 close_stat_pipe();
1018 if (t->ret != -E_SERVER_EOF)
1019 stat_task->clock_diff_count = conf.clock_diff_count_arg;
1020 set_stat_task_restart_barrier();
1021 FOR_EACH_AUDIO_FORMAT(i)
1022 afi[i].restart_barrier = stat_task->restart_barrier;
1023 }
1024
1025 static void status_pre_select(struct sched *s, struct task *t)
1026 {
1027 struct status_task *st = t->private_data;
1028 int ret;
1029
1030 t->ret = 1; /* always successful */
1031 if (st->pcd || audiod_status == AUDIOD_OFF)
1032 return;
1033 if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
1034 < 0)
1035 return;
1036 if (st->clock_diff_count) {
1037 char *argv[] = {"audiod", "stat", "1", NULL};
1038 int argc = 3;
1039 if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
1040 return;
1041 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1042 ret = client_open(argc, argv, &st->pcd);
1043
1044 } else {
1045 char *argv[] = {"audiod", "stat", NULL};
1046 int argc = 2;
1047 ret = client_open(argc, argv, &st->pcd);
1048 }
1049 set_stat_task_restart_barrier();
1050 if (ret < 0)
1051 return;
1052 st->pcd->task.event_handler = client_task_event_handler;
1053 s->timeout.tv_sec = 0;
1054 s->timeout.tv_usec = 1;
1055 }
1056
1057 static void status_post_select(__a_unused struct sched *s, struct task *t)
1058 {
1059 struct status_task *st = t->private_data;
1060 unsigned bytes_left;
1061
1062 t->ret = 1;
1063 if (!st->pcd || st->pcd->status != CL_RECEIVING)
1064 return;
1065 if (st->pcd && audiod_status == AUDIOD_OFF) {
1066 unregister_task(&st->pcd->task);
1067 close_stat_pipe();
1068 st->clock_diff_count = conf.clock_diff_count_arg;
1069 return;
1070 }
1071 bytes_left = for_each_line(st->pcd->buf, st->pcd->loaded,
1072 &check_stat_line, NULL);
1073 if (st->pcd->loaded != bytes_left) {
1074 st->last_status_read = *now;
1075 st->pcd->loaded = bytes_left;
1076 } else {
1077 struct timeval diff;
1078 tv_diff(now, &st->last_status_read, &diff);
1079 if (diff.tv_sec > 61)
1080 close_stat_pipe();
1081 }
1082 }
1083
1084 static void init_status_task(struct status_task *st)
1085 {
1086 memset(st, 0, sizeof(struct status_task));
1087 st->task.pre_select = status_pre_select;
1088 st->task.post_select = status_post_select;
1089 st->task.private_data = st;
1090 st->sa_time_diff_sign = 1;
1091 st->clock_diff_count = conf.clock_diff_count_arg;
1092 sprintf(st->task.status, "status task");
1093 }
1094
1095 static void set_initial_status(void)
1096 {
1097 audiod_status = AUDIOD_ON;
1098 if (!conf.mode_given)
1099 return;
1100 if (!strcmp(conf.mode_arg, "sb")) {
1101 audiod_status = AUDIOD_STANDBY;
1102 return;
1103 }
1104 if (!strcmp(conf.mode_arg, "off")) {
1105 audiod_status = AUDIOD_OFF;
1106 return;
1107 }
1108 if (strcmp(conf.mode_arg, "on"))
1109 PARA_WARNING_LOG("%s", "invalid mode\n");
1110 }
1111
1112 /**
1113 * the main function of para_audiod
1114 *
1115 * \param argc usual argument count
1116 * \param argv usual argument vector
1117 *
1118 * \return EXIT_SUCCESS or EXIT_FAILURE
1119 *
1120 * \sa para_audiod(1)
1121 * */
1122 int main(int argc, char *argv[])
1123 {
1124 char *config_file;
1125 int ret, i;
1126 struct sched s;
1127 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1128 struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1129
1130 valid_fd_012();
1131 audiod_cmdline_parser(argc, argv, &conf);
1132 HANDLE_VERSION_FLAG("audiod", conf);
1133 para_drop_privileges(conf.user_arg, conf.group_arg);
1134 config_file = configfile_exists();
1135 if (config_file) {
1136 struct audiod_cmdline_parser_params params = {
1137 .override = 0,
1138 .initialize = 0,
1139 .check_required = 0,
1140 .check_ambiguity = 0
1141
1142 };
1143 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1144 PARA_EMERG_LOG("%s", "parse error in config file\n");
1145 exit(EXIT_FAILURE);
1146 }
1147 free(config_file);
1148 }
1149 if (conf.logfile_given)
1150 logfile = open_log(conf.logfile_arg);
1151 log_welcome("para_audiod", conf.loglevel_arg);
1152 i = init_stream_io();
1153 if (i < 0) {
1154 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1155 exit(EXIT_FAILURE);
1156 }
1157 server_uptime(UPTIME_SET);
1158 set_initial_status();
1159 FOR_EACH_SLOT(i)
1160 clear_slot(i);
1161 init_grabbing();
1162 setup_signal_handling();
1163 signal_setup_default(sig_task);
1164 sig_task->task.event_handler = signal_event_handler;
1165
1166 init_status_task(stat_task);
1167 init_command_task(cmd_task);
1168 init_audiod_task(audiod_task);
1169
1170 if (conf.daemon_given)
1171 daemon_init();
1172
1173 register_task(&sig_task->task);
1174 register_task(&cmd_task->task);
1175 register_task(&stat_task->task);
1176 register_task(audiod_task);
1177 s.default_timeout.tv_sec = 0;
1178 s.default_timeout.tv_usec = 99 * 1000;
1179 ret = sched(&s);
1180
1181 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1182 return EXIT_FAILURE;
1183 }