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