Update documentation of activate_grab_client().
[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 break;
529 case SI_FORMAT:
530 stat_task->current_audio_format_num = get_audio_format_num(
531 line + ilen + 1);
532 }
533 return 1;
534 }
535
536 static int parse_stream_command(const char *txt, char **cmd)
537 {
538 char *p = strchr(txt, ':');
539 int i;
540
541 if (!p)
542 return -E_MISSING_COLON;
543 p++;
544 FOR_EACH_AUDIO_FORMAT(i) {
545 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
546 continue;
547 *cmd = p;
548 return i;
549 }
550 return -E_UNSUPPORTED_AUDIO_FORMAT;
551 }
552
553 static int add_filter(int format, char *cmdline)
554 {
555 struct audio_format_info *a = &afi[format];
556 int filter_num, nf = a->num_filters;
557
558 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
559 if (filter_num < 0)
560 return filter_num;
561 a->filter_nums[nf] = filter_num;
562 a->num_filters++;
563 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
564 filters[filter_num].name);
565 return filter_num;
566 }
567
568 static int init_writers(void)
569 {
570 int i, ret, nw;
571 char *cmd;
572 struct audio_format_info *a;
573
574 init_supported_writers();
575 nw = PARA_MAX(1, conf.writer_given);
576 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
577 FOR_EACH_AUDIO_FORMAT(i) {
578 a = &afi[i];
579 a->writer_conf = para_malloc(nw * sizeof(void *));
580 a->writers = para_malloc(nw * sizeof(struct writer *));
581 a->num_writers = 0;
582 }
583 for (i = 0; i < conf.writer_given; i++) {
584 void *wconf;
585 int writer_num;
586 ret = parse_stream_command(conf.writer_arg[i], &cmd);
587 if (ret < 0)
588 goto out;
589 a = &afi[ret];
590 nw = a->num_writers;
591 wconf = check_writer_arg(cmd, &writer_num);
592 if (!wconf) {
593 ret = writer_num;
594 goto out;
595 }
596 a->writers[nw] = &writers[writer_num];
597 a->writer_conf[nw] = wconf;
598 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
599 nw, writer_names[writer_num]);
600 a->num_writers++;
601 }
602 ret = 1;
603 out:
604 return ret;
605 }
606
607 static int init_receivers(void)
608 {
609 int i, ret, receiver_num;
610 char *cmd = NULL;
611 struct audio_format_info *a;
612
613 for (i = 0; receivers[i].name; i++) {
614 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
615 receivers[i].init(&receivers[i]);
616 }
617 for (i = conf.receiver_given - 1; i >= 0; i--) {
618 char *arg = conf.receiver_arg[i];
619 char *recv_arg = strchr(arg, ':');
620 ret = -E_MISSING_COLON;
621 if (!recv_arg)
622 goto out;
623 *recv_arg = '\0';
624 recv_arg++;
625 ret = get_audio_format_num(arg);
626 if (ret < 0)
627 goto out;
628 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
629 if (!afi[ret].receiver_conf) {
630 ret = -E_RECV_SYNTAX;
631 goto out;
632 }
633 afi[ret].receiver = &receivers[receiver_num];
634 }
635 /* use the first available receiver with no arguments
636 * for those audio formats for which no receiver
637 * was specified
638 */
639 cmd = para_strdup(receivers[0].name);
640 FOR_EACH_AUDIO_FORMAT(i) {
641 a = &afi[i];
642 if (a->receiver_conf)
643 continue;
644 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
645 if (!a->receiver_conf)
646 return -E_RECV_SYNTAX;
647 a->receiver = &receivers[receiver_num];
648 }
649 ret = 1;
650 out:
651 free(cmd);
652 return ret;
653 }
654
655 static int init_default_filters(void)
656 {
657 int i, ret = 1;
658
659 FOR_EACH_AUDIO_FORMAT(i) {
660 struct audio_format_info *a = &afi[i];
661 char *tmp;
662 int j;
663
664 if (a->num_filters)
665 continue; /* no default -- nothing to to */
666 /* add "dec" to audio format name */
667 tmp = make_message("%sdec", audio_formats[i]);
668 for (j = 0; filters[j].name; j++)
669 if (!strcmp(tmp, filters[j].name))
670 break;
671 free(tmp);
672 ret = -E_UNSUPPORTED_FILTER;
673 if (!filters[j].name)
674 goto out;
675 tmp = para_strdup(filters[j].name);
676 ret = add_filter(i, tmp);
677 free(tmp);
678 if (ret < 0)
679 goto out;
680 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
681 filters[j].name);
682 }
683 out:
684 return ret;
685 }
686
687 static int init_filters(void)
688 {
689 int i, ret, nf;
690
691 filter_init(filters);
692 nf = PARA_MAX(1, conf.filter_given);
693 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
694 FOR_EACH_AUDIO_FORMAT(i) {
695 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
696 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
697 }
698 if (!conf.no_default_filters_given)
699 return init_default_filters();
700 for (i = 0; i < conf.filter_given; i++) {
701 char *arg = conf.filter_arg[i];
702 char *filter_name = strchr(arg, ':');
703 ret = -E_MISSING_COLON;
704 if (!filter_name)
705 goto out;
706 *filter_name = '\0';
707 filter_name++;
708 ret = get_audio_format_num(arg);
709 if (ret < 0)
710 goto out;
711 ret = add_filter(ret, filter_name);
712 if (ret < 0)
713 goto out;
714 }
715 ret = init_default_filters(); /* use default values for the rest */
716 out:
717 return ret;
718 }
719
720 static int init_stream_io(void)
721 {
722 int ret;
723
724 ret = init_writers();
725 if (ret < 0)
726 return ret;
727 ret = init_receivers();
728 if (ret < 0)
729 return ret;
730 ret = init_filters();
731 if (ret < 0)
732 return ret;
733 return 1;
734 }
735
736 /* does not unlink socket on errors */
737 static int audiod_get_socket(void)
738 {
739 struct sockaddr_un unix_addr;
740 int ret, fd;
741
742 if (conf.socket_given)
743 socket_name = para_strdup(conf.socket_arg);
744 else {
745 char *hn = para_hostname();
746 socket_name = make_message("/var/paraslash/audiod_socket.%s",
747 hn);
748 free(hn);
749 }
750 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
751 if (conf.force_given)
752 unlink(socket_name);
753 ret = create_local_socket(socket_name, &unix_addr,
754 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
755 if (ret < 0)
756 goto err;
757 fd = ret;
758 if (listen(fd , 5) < 0) {
759 ret = -ERRNO_TO_PARA_ERROR(errno);
760 goto err;
761 }
762 ret = mark_fd_nonblocking(fd);
763 if (ret < 0)
764 goto err;
765 return fd;
766 err:
767 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
768 exit(EXIT_FAILURE);
769 }
770
771 static void signal_pre_select(struct sched *s, struct task *t)
772 {
773 struct signal_task *st = container_of(t, struct signal_task, task);
774 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
775 }
776
777 static void signal_post_select(struct sched *s, struct task *t)
778 {
779 struct signal_task *st = container_of(t, struct signal_task, task);
780 int signum;
781
782 if (!FD_ISSET(st->fd, &s->rfds))
783 return;
784
785 signum = para_next_signal();
786 switch (signum) {
787 case SIGINT:
788 case SIGTERM:
789 case SIGHUP:
790 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
791 clean_exit(EXIT_FAILURE, "caught deadly signal");
792 }
793 }
794
795 static void signal_setup_default(struct signal_task *st)
796 {
797 st->task.pre_select = signal_pre_select;
798 st->task.post_select = signal_post_select;
799 sprintf(st->task.status, "signal task");
800 }
801
802 static void command_pre_select(struct sched *s, struct task *t)
803 {
804 struct command_task *ct = container_of(t, struct command_task, task);
805 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
806 }
807
808 static void command_post_select(struct sched *s, struct task *t)
809 {
810 int ret;
811 struct command_task *ct = container_of(t, struct command_task, task);
812
813 audiod_status_dump();
814 if (!FD_ISSET(ct->fd, &s->rfds))
815 return;
816 ret = handle_connect(ct->fd);
817 if (ret < 0)
818 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
819 }
820
821 static void init_command_task(struct command_task *ct)
822 {
823 ct->task.pre_select = command_pre_select;
824 ct->task.post_select = command_post_select;
825 ct->task.error = 0;
826 ct->fd = audiod_get_socket(); /* doesn't return on errors */
827 sprintf(ct->task.status, "command task");
828 }
829
830 static void close_stat_pipe(void)
831 {
832 int i;
833
834 if (!stat_task->ct)
835 return;
836 client_close(stat_task->ct);
837 stat_task->ct = NULL;
838 FOR_EACH_STATUS_ITEM(i) {
839 free(stat_task->stat_item_values[i]);
840 stat_task->stat_item_values[i] = NULL;
841 }
842 dump_empty_status();
843 stat_task->length_seconds = 0;
844 stat_task->offset_seconds = 0;
845 audiod_status_dump();
846 stat_task->playing = 0;
847 stat_task->stat_item_values[SI_BASENAME] = make_message(
848 "%s: no connection to para_server\n",
849 status_item_list[SI_BASENAME]);
850 stat_client_write(stat_task->stat_item_values[SI_BASENAME],
851 SI_BASENAME);
852 }
853
854 /**
855 * close the connection to para_server and exit
856 *
857 * \param status the exit status which is passed to exit(3)
858 * \param msg the log message
859 *
860 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
861 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
862 * EXIT_FAILURE.
863 *
864 * \sa exit(3)
865 */
866 void __noreturn clean_exit(int status, const char *msg)
867 {
868 PARA_EMERG_LOG("%s\n", msg);
869 if (socket_name)
870 unlink(socket_name);
871 close_stat_pipe();
872 exit(status);
873 }
874
875 /* avoid busy loop if server is down */
876 static void set_stat_task_restart_barrier(unsigned seconds)
877 {
878 struct timeval delay = {seconds, 0};
879 tv_add(now, &delay, &stat_task->restart_barrier);
880 }
881
882 static void try_to_close_slot(int slot_num)
883 {
884 struct slot_info *s = &slot[slot_num];
885
886 if (s->format < 0)
887 return;
888 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
889 return;
890 if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
891 return;
892 if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
893 return;
894 PARA_INFO_LOG("closing slot %d\n", slot_num);
895 wng_close(s->wng);
896 close_filters(s->fc);
897 free(s->fc);
898 close_receiver(slot_num);
899 clear_slot(slot_num);
900 }
901
902 /*
903 * Check if any receivers/filters/writers need to be started and do so if
904 * necessary.
905 */
906 static void start_stop_decoders(struct sched *s)
907 {
908 int i;
909
910 FOR_EACH_SLOT(i)
911 try_to_close_slot(i);
912 if (audiod_status != AUDIOD_ON || !stat_task->playing)
913 return kill_all_decoders(-E_NOT_PLAYING);
914 open_current_receiver(s);
915 FOR_EACH_SLOT(i) {
916 struct slot_info *sl = &slot[i];
917 struct audio_format_info *a;
918 struct timeval diff;
919
920 if (sl->format < 0)
921 continue;
922 a = &afi[sl->format];
923 if (!sl->receiver_node)
924 continue;
925 if ((!a->num_filters || sl->fc) && sl->wng)
926 continue; /* everything already started */
927 if (!a->num_filters) {
928 if (sl->receiver_node->loaded && !sl->wng) {
929 open_writers(i);
930 }
931 continue;
932 }
933 if (sl->receiver_node->loaded && !sl->fc) {
934 open_filters(i);
935 continue;
936 }
937 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
938 continue;
939 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
940 open_writers(i);
941 continue;
942 }
943 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
944 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
945 s->timeout = diff;
946 }
947 }
948 }
949
950
951 /* restart the client task if necessary */
952 static void status_pre_select(struct sched *s, struct task *t)
953 {
954 struct status_task *st = container_of(t, struct status_task, task);
955
956 if (audiod_status == AUDIOD_OFF) {
957 if (!st->ct)
958 goto out;
959 if (st->ct->task.error >= 0) {
960 st->ct->task.error = -E_AUDIOD_OFF;
961 goto out;
962 }
963 if (st->ct->task.error != -E_TASK_UNREGISTERED)
964 goto out;
965 close_stat_pipe();
966 st->clock_diff_count = conf.clock_diff_count_arg;
967 goto out;
968 }
969 if (st->ct) {
970 unsigned bytes_left;
971 if (st->ct->task.error < 0) {
972 if (st->ct->task.error != -E_TASK_UNREGISTERED)
973 goto out;
974 close_stat_pipe();
975 goto out;
976 }
977 if (st->ct->status != CL_RECEIVING)
978 goto out;
979 bytes_left = for_each_line(st->ct->buf, st->ct->loaded,
980 &check_stat_line, NULL);
981 if (st->ct->loaded != bytes_left) {
982 st->last_status_read = *now;
983 st->ct->loaded = bytes_left;
984 } else {
985 struct timeval diff;
986 tv_diff(now, &st->last_status_read, &diff);
987 if (diff.tv_sec > 61)
988 st->ct->task.error = -E_STATUS_TIMEOUT;
989 }
990 goto out;
991 }
992 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
993 goto out;
994 if (st->clock_diff_count) { /* get status only one time */
995 char *argv[] = {"audiod", "stat", "1", NULL};
996 int argc = 3;
997 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
998 st->clock_diff_count--;
999 client_open(argc, argv, &st->ct);
1000 set_stat_task_restart_barrier(2);
1001
1002 } else {
1003 char *argv[] = {"audiod", "stat", NULL};
1004 int argc = 2;
1005 client_open(argc, argv, &st->ct);
1006 set_stat_task_restart_barrier(5);
1007 }
1008 st->last_status_read = *now;
1009 out:
1010 start_stop_decoders(s);
1011 }
1012
1013 static void init_status_task(struct status_task *st)
1014 {
1015 memset(st, 0, sizeof(struct status_task));
1016 st->task.pre_select = status_pre_select;
1017 st->sa_time_diff_sign = 1;
1018 st->clock_diff_count = conf.clock_diff_count_arg;
1019 st->current_audio_format_num = -1;
1020 sprintf(st->task.status, "status task");
1021 }
1022
1023 static void set_initial_status(void)
1024 {
1025 audiod_status = AUDIOD_ON;
1026 if (!conf.mode_given)
1027 return;
1028 if (!strcmp(conf.mode_arg, "sb")) {
1029 audiod_status = AUDIOD_STANDBY;
1030 return;
1031 }
1032 if (!strcmp(conf.mode_arg, "off")) {
1033 audiod_status = AUDIOD_OFF;
1034 return;
1035 }
1036 if (strcmp(conf.mode_arg, "on"))
1037 PARA_WARNING_LOG("invalid mode\n");
1038 }
1039
1040 /**
1041 * the main function of para_audiod
1042 *
1043 * \param argc usual argument count
1044 * \param argv usual argument vector
1045 *
1046 * \return EXIT_SUCCESS or EXIT_FAILURE
1047 *
1048 * \sa para_audiod(1)
1049 * */
1050 int main(int argc, char *argv[])
1051 {
1052 char *config_file;
1053 int ret, i;
1054 struct sched s;
1055 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1056
1057 valid_fd_012();
1058 audiod_cmdline_parser(argc, argv, &conf);
1059 HANDLE_VERSION_FLAG("audiod", conf);
1060 para_drop_privileges(conf.user_arg, conf.group_arg);
1061 config_file = configfile_exists();
1062 if (config_file) {
1063 struct audiod_cmdline_parser_params params = {
1064 .override = 0,
1065 .initialize = 0,
1066 .check_required = 0,
1067 .check_ambiguity = 0
1068
1069 };
1070 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1071 PARA_EMERG_LOG("parse error in config file\n");
1072 exit(EXIT_FAILURE);
1073 }
1074 free(config_file);
1075 }
1076 if (conf.logfile_given)
1077 logfile = open_log(conf.logfile_arg);
1078 log_welcome("para_audiod", conf.loglevel_arg);
1079 i = init_stream_io();
1080 if (i < 0) {
1081 PARA_EMERG_LOG("init stream io error: %s\n", para_strerror(-i));
1082 exit(EXIT_FAILURE);
1083 }
1084 server_uptime(UPTIME_SET);
1085 set_initial_status();
1086 FOR_EACH_SLOT(i)
1087 clear_slot(i);
1088 init_grabbing();
1089 setup_signal_handling();
1090 signal_setup_default(sig_task);
1091
1092 init_status_task(stat_task);
1093 init_command_task(cmd_task);
1094
1095 if (conf.daemon_given)
1096 daemon_init();
1097
1098 register_task(&sig_task->task);
1099 register_task(&cmd_task->task);
1100 register_task(&stat_task->task);
1101 s.default_timeout.tv_sec = 0;
1102 s.default_timeout.tv_usec = 99 * 1000;
1103 ret = schedule(&s);
1104
1105 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1106 return EXIT_FAILURE;
1107 }