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