filter: Switch from linked lists to arrays.
[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) {
216 PARA_INFO_LOG("unregistering writer node group in slot %d\n",
217 i);
218 wng_unregister(s->wng);
219 s->wng->task.error = error;
220 }
221 if (s->fc && !s->fc->task.error) {
222 PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
223 unregister_task(&s->fc->task);
224 s->fc->task.error = error;
225 }
226 if (s->receiver_node && !s->receiver_node->task.error) {
227 PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
228 unregister_task(&s->receiver_node->task);
229 s->receiver_node->task.error = error;
230 }
231 }
232 }
233
234 static int get_empty_slot(void)
235 {
236 int i;
237 struct slot_info *s;
238
239 FOR_EACH_SLOT(i) {
240 s = &slot[i];
241 if (s->format < 0) {
242 clear_slot(i);
243 return i;
244 }
245 if (s->wng || s->receiver_node || s->fc)
246 continue;
247 clear_slot(i);
248 return i;
249 }
250 return -E_NO_MORE_SLOTS;
251 }
252
253 /**
254 * get the number of filters
255 *
256 * \param audio_format_num the number identifying the audio format
257 *
258 * \return the number of filters for the given audio format
259 *
260 * \sa struct filter;
261 */
262 int num_filters(int audio_format_num)
263 {
264 return afi[audio_format_num].num_filters;
265 }
266
267 static void open_filters(int slot_num)
268 {
269 struct slot_info *s = &slot[slot_num];
270 struct audio_format_info *a = &afi[s->format];
271 struct filter_node *fn;
272 int nf = a->num_filters;
273 int i;
274
275 s->fc = NULL;
276 if (!nf)
277 return;
278 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
279 s->fc = para_calloc(sizeof(struct filter_chain));
280 s->fc->filter_nodes = para_malloc(nf * sizeof(struct filter_chain));
281 s->fc->inbuf = s->receiver_node->buf;
282 s->fc->in_loaded = &s->receiver_node->loaded;
283 s->fc->input_error = &s->receiver_node->task.error;
284 s->fc->task.pre_select = filter_pre_select;
285 s->fc->task.post_select = NULL;
286 s->fc->task.error = 0;
287 s->fc->num_filters = nf;
288
289 s->receiver_node->output_error = &s->fc->task.error;
290 sprintf(s->fc->task.status, "filter chain");
291 FOR_EACH_FILTER_NODE(fn, s->fc, i) {
292 struct filter *f = filters + a->filter_nums[i];
293 fn->filter_num = a->filter_nums[i];
294 fn->conf = a->filter_conf[i];
295 fn->fc = s->fc;
296 fn->loaded = 0;
297 INIT_LIST_HEAD(&fn->callbacks);
298 f->open(fn);
299 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
300 audio_formats[s->format], i + 1, nf, f->name, slot_num);
301 s->fc->outbuf = fn->buf;
302 s->fc->out_loaded = &fn->loaded;
303 }
304 register_task(&s->fc->task);
305 }
306
307 static void open_writers(int slot_num)
308 {
309 int ret, i;
310 struct slot_info *s = &slot[slot_num];
311 struct audio_format_info *a = &afi[s->format];
312
313 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
314 if (!a->num_writers)
315 s->wng = setup_default_wng();
316 else
317 s->wng = wng_new(a->num_writers);
318 if (s->fc) {
319 s->wng->buf = s->fc->outbuf;
320 s->wng->loaded = s->fc->out_loaded;
321 s->wng->input_error = &s->fc->task.error;
322 s->wng->channels = &s->fc->channels;
323 s->wng->samplerate = &s->fc->samplerate;
324 s->fc->output_error = &s->wng->task.error;
325 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
326 } else {
327 s->wng->buf = s->receiver_node->buf;
328 s->wng->loaded = &s->receiver_node->loaded;
329 s->wng->input_error = &s->receiver_node->task.error;
330 }
331 for (i = 0; i < a->num_writers; i++) {
332 s->wng->writer_nodes[i].conf = a->writer_conf[i];
333 s->wng->writer_nodes[i].writer = a->writers[i];
334 }
335 ret = wng_open(s->wng);
336 if (ret < 0) {
337 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
338 return;
339 }
340 s->wstime = *now;
341 activate_inactive_grab_clients(slot_num, s->format, s->fc);
342 }
343
344 #if 0
345 static void rn_event_handler(struct task *t)
346 {
347 struct receiver_node *rn = t->private_data;
348 int i;
349
350 PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
351 unregister_task(t);
352 rn->error = t->ret;
353 /* set restart barrier */
354 FOR_EACH_SLOT(i) {
355 struct timeval restart_delay = {0, 10 * 1000};
356 if (slot[i].receiver_node != rn)
357 continue;
358 if (rn->error != -E_RECV_EOF)
359 /* don't reconnect immediately on errors */
360 restart_delay.tv_sec = 5;
361 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
362 }
363 }
364 #endif
365
366 static int open_receiver(int format)
367 {
368 struct audio_format_info *a = &afi[format];
369 struct slot_info *s;
370 int ret, slot_num;
371 struct receiver_node *rn;
372 const struct timeval restart_delay = {1, 0};
373
374 ret = get_empty_slot();
375 if (ret < 0)
376 goto err;
377 slot_num = ret;
378 s = &slot[slot_num];
379 s->format = format;
380 s->receiver_node = para_calloc(sizeof(struct receiver_node));
381 rn = s->receiver_node;
382 rn->receiver = a->receiver;
383 rn->conf = a->receiver_conf;
384 ret = a->receiver->open(s->receiver_node);
385 if (ret < 0) {
386 free(s->receiver_node);
387 s->receiver_node = NULL;
388 goto err;
389 }
390 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
391 audio_formats[s->format], a->receiver->name, slot_num);
392 rn->task.pre_select = a->receiver->pre_select;
393 rn->task.post_select = a->receiver->post_select;
394 sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
395 register_task(&rn->task);
396 return 1;
397 err:
398 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
399 tv_add(now, &restart_delay, &afi[format].restart_barrier);
400 return ret;
401 }
402
403 static int receiver_running(int format)
404 {
405 int i;
406
407 FOR_EACH_SLOT(i) {
408 struct slot_info *s = &slot[i];
409 if (s->format == format && s->receiver_node
410 && s->receiver_node->task.error >= 0)
411 return 1;
412 }
413 return 0;
414 }
415
416 static int open_current_receiver(struct sched *s)
417 {
418 struct timeval diff;
419 int cafn = stat_task->current_audio_format_num;
420
421 if (cafn < 0 || !stat_task->ct)
422 return 0;
423 if (receiver_running(cafn))
424 return 0;
425 if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
426 s->timeout = diff;
427 return 0;
428 }
429 return open_receiver(cafn) < 0? 0 : 1;
430 }
431
432 static unsigned compute_time_diff(const struct timeval *status_time)
433 {
434 struct timeval tmp, diff;
435 static unsigned count;
436 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
437 const struct timeval max_deviation = {0, 500 * 1000};
438 const int time_smooth = 5;
439
440 if (!status_time)
441 return count;
442 sign = tv_diff(status_time, now, &diff);
443 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
444 // sign, sa_time_diff_sign);
445 if (!count) {
446 sa_time_diff_sign = sign;
447 stat_task->sa_time_diff = diff;
448 count++;
449 goto out;
450 }
451 if (count > 5) {
452 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
453 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
454 PARA_WARNING_LOG("time diff jump: %lims\n",
455 s * tv2ms(&tmp));
456 }
457 count++;
458 sa_time_diff_sign = tv_convex_combination(
459 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
460 count > 10? sign : sign * time_smooth, &diff,
461 &tmp);
462 stat_task->sa_time_diff = tmp;
463 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
464 sign > 0? "+" : "-",
465 tv2ms(&diff),
466 sa_time_diff_sign ? "+" : "-",
467 tv2ms(&stat_task->sa_time_diff)
468 );
469 out:
470 stat_task->sa_time_diff_sign = sa_time_diff_sign;
471 return count;
472 }
473
474 static int check_stat_line(char *line, __a_unused void *data)
475 {
476 int itemnum;
477 size_t ilen = 0;
478 long unsigned sec, usec;
479 char *tmp;
480
481 //PARA_INFO_LOG("line: %s\n", line);
482 if (!line)
483 return 1;
484 itemnum = stat_line_valid(line);
485 if (itemnum < 0) {
486 PARA_WARNING_LOG("invalid status line: %s\n", line);
487 return 1;
488 }
489 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
490 return 1;
491 tmp = make_message("%s\n", line);
492 stat_client_write(tmp, itemnum);
493 free(tmp);
494 free(stat_task->stat_item_values[itemnum]);
495 stat_task->stat_item_values[itemnum] = para_strdup(line);
496 ilen = strlen(status_item_list[itemnum]);
497 switch (itemnum) {
498 case SI_STATUS:
499 stat_task->playing = strstr(line, "playing")? 1 : 0;
500 PARA_INFO_LOG("stat task playing: %d\n", stat_task->playing);
501 break;
502 case SI_OFFSET:
503 stat_task->offset_seconds = atoi(line + ilen + 1);
504 break;
505 case SI_SECONDS_TOTAL:
506 stat_task->length_seconds = atoi(line + ilen + 1);
507 break;
508 case SI_STREAM_START:
509 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
510 struct timeval a_start, delay;
511 delay.tv_sec = conf.stream_delay_arg / 1000;
512 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
513 stat_task->server_stream_start.tv_sec = sec;
514 stat_task->server_stream_start.tv_usec = usec;
515 if (compute_time_diff(NULL) > 2) {
516 if (stat_task->sa_time_diff_sign < 0)
517 tv_add(&stat_task->server_stream_start,
518 &stat_task->sa_time_diff, &a_start);
519 else
520 tv_diff(&stat_task->server_stream_start,
521 &stat_task->sa_time_diff, &a_start);
522 tv_add(&a_start, &delay, &initial_delay_barrier);
523 }
524 }
525 break;
526 case SI_CURRENT_TIME:
527 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
528 struct timeval tv = {sec, usec};
529 compute_time_diff(&tv);
530 }
531 if (stat_task->clock_diff_count)
532 stat_task->clock_diff_count--;
533 break;
534 case SI_FORMAT:
535 stat_task->current_audio_format_num = get_audio_format_num(
536 line + ilen + 1);
537 }
538 return 1;
539 }
540
541 static void try_to_close_slot(int slot_num)
542 {
543 struct slot_info *s = &slot[slot_num];
544
545 if (s->format < 0)
546 return;
547 if (s->receiver_node && s->receiver_node->task.error >= 0)
548 return;
549 if (s->fc && s->fc->task.error >= 0)
550 return;
551 if (s->wng && s->wng->task.error >= 0)
552 return;
553 PARA_INFO_LOG("closing slot %d\n", slot_num);
554 wng_close(s->wng);
555 close_filters(s->fc);
556 free(s->fc);
557 close_receiver(slot_num);
558 clear_slot(slot_num);
559 }
560
561 /*
562 * Check if any receivers/filters/writers need to be started and do so if
563 * necessary. Since the pre_select function didn't have a chance yet to put
564 * file descriptors into the fd sets given by s, make the upcoming select()
565 * return immediately to avoid a long timeout in case we started something.
566 */
567 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
568 {
569 int i;
570 struct timeval min_delay = {0, 1};
571
572 if (audiod_status != AUDIOD_ON || !stat_task->playing)
573 return kill_all_decoders(-E_NOT_PLAYING);
574 if (open_current_receiver(s))
575 s->timeout = min_delay;
576 FOR_EACH_SLOT(i) {
577 struct slot_info *sl = &slot[i];
578 struct audio_format_info *a;
579 struct timeval diff;
580
581 if (sl->format < 0)
582 continue;
583 a = &afi[sl->format];
584 if (!sl->receiver_node)
585 continue;
586 if ((!a->num_filters || sl->fc) && sl->wng)
587 continue; /* everything already started */
588 if (!a->num_filters) {
589 if (sl->receiver_node->loaded && !sl->wng) {
590 open_writers(i);
591 s->timeout = min_delay;
592 }
593 continue;
594 }
595 if (sl->receiver_node->loaded && !sl->fc) {
596 open_filters(i);
597 s->timeout = min_delay;
598 continue;
599 }
600 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
601 continue;
602 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
603 open_writers(i);
604 s->timeout = min_delay;
605 continue;
606 }
607 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
608 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
609 s->timeout = diff;
610 }
611 }
612 }
613
614 static void audiod_post_select(__a_unused struct sched *s,
615 __a_unused struct task *t)
616 {
617 int i;
618
619 FOR_EACH_SLOT(i)
620 try_to_close_slot(i);
621 }
622
623 static void init_audiod_task(struct task *t)
624 {
625 t->pre_select = audiod_pre_select;
626 t->post_select = audiod_post_select;
627 t->error = 0;
628 sprintf(t->status, "audiod task");
629 }
630
631 static int parse_stream_command(const char *txt, char **cmd)
632 {
633 char *p = strchr(txt, ':');
634 int i;
635
636 if (!p)
637 return -E_MISSING_COLON;
638 p++;
639 FOR_EACH_AUDIO_FORMAT(i) {
640 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
641 continue;
642 *cmd = p;
643 return i;
644 }
645 return -E_UNSUPPORTED_AUDIO_FORMAT;
646 }
647
648 static int add_filter(int format, char *cmdline)
649 {
650 struct audio_format_info *a = &afi[format];
651 int filter_num, nf = a->num_filters;
652
653 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
654 if (filter_num < 0)
655 return filter_num;
656 a->filter_nums[nf] = filter_num;
657 a->num_filters++;
658 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
659 filters[filter_num].name);
660 return filter_num;
661 }
662
663 static int init_writers(void)
664 {
665 int i, ret, nw;
666 char *cmd;
667 struct audio_format_info *a;
668
669 init_supported_writers();
670 nw = PARA_MAX(1, conf.writer_given);
671 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
672 FOR_EACH_AUDIO_FORMAT(i) {
673 a = &afi[i];
674 a->writer_conf = para_malloc(nw * sizeof(void *));
675 a->writers = para_malloc(nw * sizeof(struct writer *));
676 a->num_writers = 0;
677 }
678 for (i = 0; i < conf.writer_given; i++) {
679 void *wconf;
680 int writer_num;
681 ret = parse_stream_command(conf.writer_arg[i], &cmd);
682 if (ret < 0)
683 goto out;
684 a = &afi[ret];
685 nw = a->num_writers;
686 wconf = check_writer_arg(cmd, &writer_num);
687 if (!wconf) {
688 ret = writer_num;
689 goto out;
690 }
691 a->writers[nw] = &writers[writer_num];
692 a->writer_conf[nw] = wconf;
693 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
694 nw, writer_names[writer_num]);
695 a->num_writers++;
696 }
697 ret = 1;
698 out:
699 return ret;
700 }
701
702 static int init_receivers(void)
703 {
704 int i, ret, receiver_num;
705 char *cmd = NULL;
706 struct audio_format_info *a;
707
708 for (i = 0; receivers[i].name; i++) {
709 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
710 receivers[i].init(&receivers[i]);
711 }
712 for (i = conf.receiver_given - 1; i >= 0; i--) {
713 char *arg = conf.receiver_arg[i];
714 char *recv_arg = strchr(arg, ':');
715 ret = -E_MISSING_COLON;
716 if (!recv_arg)
717 goto out;
718 *recv_arg = '\0';
719 recv_arg++;
720 ret = get_audio_format_num(arg);
721 if (ret < 0)
722 goto out;
723 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
724 if (!afi[ret].receiver_conf) {
725 ret = -E_RECV_SYNTAX;
726 goto out;
727 }
728 afi[ret].receiver = &receivers[receiver_num];
729 }
730 /* use the first available receiver with no arguments
731 * for those audio formats for which no receiver
732 * was specified
733 */
734 cmd = para_strdup(receivers[0].name);
735 FOR_EACH_AUDIO_FORMAT(i) {
736 a = &afi[i];
737 if (a->receiver_conf)
738 continue;
739 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
740 if (!a->receiver_conf)
741 return -E_RECV_SYNTAX;
742 a->receiver = &receivers[receiver_num];
743 }
744 ret = 1;
745 out:
746 free(cmd);
747 return ret;
748 }
749
750 static int init_default_filters(void)
751 {
752 int i, ret = 1;
753
754 FOR_EACH_AUDIO_FORMAT(i) {
755 struct audio_format_info *a = &afi[i];
756 char *tmp;
757 int j;
758
759 if (a->num_filters)
760 continue; /* no default -- nothing to to */
761 /* add "dec" to audio format name */
762 tmp = make_message("%sdec", audio_formats[i]);
763 for (j = 0; filters[j].name; j++)
764 if (!strcmp(tmp, filters[j].name))
765 break;
766 free(tmp);
767 ret = -E_UNSUPPORTED_FILTER;
768 if (!filters[j].name)
769 goto out;
770 tmp = para_strdup(filters[j].name);
771 ret = add_filter(i, tmp);
772 free(tmp);
773 if (ret < 0)
774 goto out;
775 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
776 filters[j].name);
777 }
778 out:
779 return ret;
780 }
781
782 static int init_filters(void)
783 {
784 int i, ret, nf;
785
786 filter_init(filters);
787 nf = PARA_MAX(1, conf.filter_given);
788 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
789 FOR_EACH_AUDIO_FORMAT(i) {
790 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
791 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
792 }
793 if (!conf.no_default_filters_given)
794 return init_default_filters();
795 for (i = 0; i < conf.filter_given; i++) {
796 char *arg = conf.filter_arg[i];
797 char *filter_name = strchr(arg, ':');
798 ret = -E_MISSING_COLON;
799 if (!filter_name)
800 goto out;
801 *filter_name = '\0';
802 filter_name++;
803 ret = get_audio_format_num(arg);
804 if (ret < 0)
805 goto out;
806 ret = add_filter(ret, filter_name);
807 if (ret < 0)
808 goto out;
809 }
810 ret = init_default_filters(); /* use default values for the rest */
811 out:
812 return ret;
813 }
814
815 static int init_stream_io(void)
816 {
817 int ret;
818
819 ret = init_writers();
820 if (ret < 0)
821 return ret;
822 ret = init_receivers();
823 if (ret < 0)
824 return ret;
825 ret = init_filters();
826 if (ret < 0)
827 return ret;
828 return 1;
829 }
830
831 /* does not unlink socket on errors */
832 static int audiod_get_socket(void)
833 {
834 struct sockaddr_un unix_addr;
835 int ret, fd;
836
837 if (conf.socket_given)
838 socket_name = para_strdup(conf.socket_arg);
839 else {
840 char *hn = para_hostname();
841 socket_name = make_message("/var/paraslash/audiod_socket.%s",
842 hn);
843 free(hn);
844 }
845 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
846 if (conf.force_given)
847 unlink(socket_name);
848 ret = create_local_socket(socket_name, &unix_addr,
849 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
850 if (ret < 0)
851 goto err;
852 fd = ret;
853 if (listen(fd , 5) < 0) {
854 ret = -ERRNO_TO_PARA_ERROR(errno);
855 goto err;
856 }
857 ret = mark_fd_nonblocking(fd);
858 if (ret < 0)
859 goto err;
860 return fd;
861 err:
862 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
863 exit(EXIT_FAILURE);
864 }
865
866 static void signal_pre_select(struct sched *s, struct task *t)
867 {
868 struct signal_task *st = container_of(t, struct signal_task, task);
869 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
870 }
871
872 static void signal_post_select(struct sched *s, struct task *t)
873 {
874 struct signal_task *st = container_of(t, struct signal_task, task);
875 int signum;
876
877 if (!FD_ISSET(st->fd, &s->rfds))
878 return;
879
880 signum = para_next_signal();
881 switch (signum) {
882 case SIGINT:
883 case SIGTERM:
884 case SIGHUP:
885 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
886 clean_exit(EXIT_FAILURE, "caught deadly signal");
887 }
888 }
889
890 static void signal_setup_default(struct signal_task *st)
891 {
892 st->task.pre_select = signal_pre_select;
893 st->task.post_select = signal_post_select;
894 sprintf(st->task.status, "signal task");
895 }
896
897 static void command_pre_select(struct sched *s, struct task *t)
898 {
899 struct command_task *ct = container_of(t, struct command_task, task);
900 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
901 }
902
903 static void command_post_select(struct sched *s, struct task *t)
904 {
905 int ret;
906 struct command_task *ct = container_of(t, struct command_task, task);
907
908 audiod_status_dump();
909 if (!FD_ISSET(ct->fd, &s->rfds))
910 return;
911 ret = handle_connect(ct->fd);
912 if (ret < 0)
913 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
914 }
915
916 static void init_command_task(struct command_task *ct)
917 {
918 ct->task.pre_select = command_pre_select;
919 ct->task.post_select = command_post_select;
920 ct->task.error = 0;
921 ct->fd = audiod_get_socket(); /* doesn't return on errors */
922 sprintf(ct->task.status, "command task");
923 }
924
925 static void close_stat_pipe(void)
926 {
927 int i;
928
929 if (!stat_task->ct)
930 return;
931 client_close(stat_task->ct);
932 stat_task->ct = NULL;
933 FOR_EACH_STATUS_ITEM(i) {
934 free(stat_task->stat_item_values[i]);
935 stat_task->stat_item_values[i] = NULL;
936 }
937 dump_empty_status();
938 stat_task->length_seconds = 0;
939 stat_task->offset_seconds = 0;
940 audiod_status_dump();
941 stat_task->playing = 0;
942 stat_task->stat_item_values[SI_BASENAME] = make_message(
943 "%s: no connection to para_server\n",
944 status_item_list[SI_BASENAME]);
945 stat_client_write(stat_task->stat_item_values[SI_BASENAME],
946 SI_BASENAME);
947 if (stat_task->clock_diff_count) {
948 stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
949 stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
950 }
951 }
952
953 /**
954 * close the connection to para_server and exit
955 *
956 * \param status the exit status which is passed to exit(3)
957 * \param msg the log message
958 *
959 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
960 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
961 * EXIT_FAILURE.
962 *
963 * \sa exit(3)
964 */
965 void __noreturn clean_exit(int status, const char *msg)
966 {
967 PARA_EMERG_LOG("%s\n", msg);
968 if (socket_name)
969 unlink(socket_name);
970 close_stat_pipe();
971 exit(status);
972 }
973
974 /* avoid busy loop if server is down */
975 static void set_stat_task_restart_barrier(void)
976 {
977 struct timeval delay = {5, 0};
978 tv_add(now, &delay, &stat_task->restart_barrier);
979 }
980
981 /* restart the client task if necessary */
982 static void status_pre_select(struct sched *s, struct task *t)
983 {
984 struct status_task *st = container_of(t, struct status_task, task);
985 int ret;
986
987 if (st->ct || audiod_status == AUDIOD_OFF) /* no need to restart */
988 return;
989 if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
990 < 0)
991 return;
992 if (st->clock_diff_count) { /* get status only one time */
993 char *argv[] = {"audiod", "stat", "1", NULL};
994 int argc = 3;
995 if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
996 return;
997 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
998 ret = client_open(argc, argv, &st->ct);
999
1000 } else {
1001 char *argv[] = {"audiod", "stat", NULL};
1002 int argc = 2;
1003 ret = client_open(argc, argv, &st->ct);
1004 }
1005 set_stat_task_restart_barrier();
1006 if (ret < 0)
1007 return;
1008 s->timeout.tv_sec = 0;
1009 s->timeout.tv_usec = 1;
1010 }
1011
1012 static void status_post_select(__a_unused struct sched *s, struct task *t)
1013 {
1014 struct status_task *st = container_of(t, struct status_task, task);
1015 unsigned bytes_left;
1016
1017 if (!st->ct || st->ct->status != CL_RECEIVING)
1018 return;
1019 if (audiod_status == AUDIOD_OFF || st->ct->task.error < 0) {
1020 if (st->ct->task.error >= 0)
1021 unregister_task(&st->ct->task);
1022 if (audiod_status == AUDIOD_OFF)
1023 st->clock_diff_count = conf.clock_diff_count_arg;
1024 close_stat_pipe();
1025 return;
1026 }
1027 bytes_left = for_each_line(st->ct->buf, st->ct->loaded,
1028 &check_stat_line, NULL);
1029 if (st->ct->loaded != bytes_left) {
1030 st->last_status_read = *now;
1031 st->ct->loaded = bytes_left;
1032 } else {
1033 struct timeval diff;
1034 tv_diff(now, &st->last_status_read, &diff);
1035 if (diff.tv_sec > 61)
1036 close_stat_pipe();
1037 }
1038 }
1039
1040 static void init_status_task(struct status_task *st)
1041 {
1042 memset(st, 0, sizeof(struct status_task));
1043 st->task.pre_select = status_pre_select;
1044 st->task.post_select = status_post_select;
1045 st->sa_time_diff_sign = 1;
1046 st->clock_diff_count = conf.clock_diff_count_arg;
1047 st->current_audio_format_num = -1;
1048 sprintf(st->task.status, "status task");
1049 }
1050
1051 static void set_initial_status(void)
1052 {
1053 audiod_status = AUDIOD_ON;
1054 if (!conf.mode_given)
1055 return;
1056 if (!strcmp(conf.mode_arg, "sb")) {
1057 audiod_status = AUDIOD_STANDBY;
1058 return;
1059 }
1060 if (!strcmp(conf.mode_arg, "off")) {
1061 audiod_status = AUDIOD_OFF;
1062 return;
1063 }
1064 if (strcmp(conf.mode_arg, "on"))
1065 PARA_WARNING_LOG("invalid mode\n");
1066 }
1067
1068 /**
1069 * the main function of para_audiod
1070 *
1071 * \param argc usual argument count
1072 * \param argv usual argument vector
1073 *
1074 * \return EXIT_SUCCESS or EXIT_FAILURE
1075 *
1076 * \sa para_audiod(1)
1077 * */
1078 int main(int argc, char *argv[])
1079 {
1080 char *config_file;
1081 int ret, i;
1082 struct sched s;
1083 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1084 struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1085
1086 valid_fd_012();
1087 audiod_cmdline_parser(argc, argv, &conf);
1088 HANDLE_VERSION_FLAG("audiod", conf);
1089 para_drop_privileges(conf.user_arg, conf.group_arg);
1090 config_file = configfile_exists();
1091 if (config_file) {
1092 struct audiod_cmdline_parser_params params = {
1093 .override = 0,
1094 .initialize = 0,
1095 .check_required = 0,
1096 .check_ambiguity = 0
1097
1098 };
1099 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1100 PARA_EMERG_LOG("parse error in config file\n");
1101 exit(EXIT_FAILURE);
1102 }
1103 free(config_file);
1104 }
1105 if (conf.logfile_given)
1106 logfile = open_log(conf.logfile_arg);
1107 log_welcome("para_audiod", conf.loglevel_arg);
1108 i = init_stream_io();
1109 if (i < 0) {
1110 PARA_EMERG_LOG("init stream io error: %s\n", para_strerror(-i));
1111 exit(EXIT_FAILURE);
1112 }
1113 server_uptime(UPTIME_SET);
1114 set_initial_status();
1115 FOR_EACH_SLOT(i)
1116 clear_slot(i);
1117 init_grabbing();
1118 setup_signal_handling();
1119 signal_setup_default(sig_task);
1120
1121 init_status_task(stat_task);
1122 init_command_task(cmd_task);
1123 init_audiod_task(audiod_task);
1124
1125 if (conf.daemon_given)
1126 daemon_init();
1127
1128 register_task(&sig_task->task);
1129 register_task(&cmd_task->task);
1130 register_task(&stat_task->task);
1131 register_task(audiod_task);
1132 s.default_timeout.tv_sec = 0;
1133 s.default_timeout.tv_usec = 99 * 1000;
1134 ret = schedule(&s);
1135
1136 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1137 return EXIT_FAILURE;
1138 }