Merge commit 'remotes/meins/v0.3' into v0.3
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file audiod.c the paraslash's audio daemon */
8 #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 to handle 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 /** pointer to the array of filters to be activated */
45 struct filter **filters;
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 FOR_EACH_AUDIO_FORMAT(i)
122 if (!strcmp(name, audio_formats[i]))
123 return i;
124 return -E_UNSUPPORTED_AUDIO_FORMAT;
125 }
126
127 /**
128 * the log function of para_audiod
129 *
130 * \param ll loglevel
131 * \param fmt the format string
132 */
133 void para_log(int ll, const char* fmt,...)
134 {
135 va_list argp;
136 FILE *outfd;
137 struct tm *tm;
138 time_t t1;
139 char str[MAXLINE] = "";
140 static char *hostname;
141
142 if (ll < conf.loglevel_arg)
143 return;
144 if (!hostname)
145 hostname = para_hostname();
146 outfd = logfile? logfile : stderr;
147 time(&t1);
148 tm = localtime(&t1);
149 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
150 fprintf(outfd, "%s %s ", str, hostname);
151 if (conf.loglevel_arg <= INFO)
152 fprintf(outfd, "%i ", ll);
153 va_start(argp, fmt);
154 vfprintf(outfd, fmt, argp);
155 va_end(argp);
156 }
157
158 static char *configfile_exists(void)
159 {
160 char *home = para_homedir();
161 char *config_file = make_message("%s/.paraslash/audiod.conf",
162 home);
163 free(home);
164 if (file_exists(config_file))
165 return config_file;
166 free(config_file);
167 return NULL;
168 }
169
170 static void setup_signal_handling(void)
171 {
172 sig_task->fd = para_signal_init();
173 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
174 para_install_sighandler(SIGINT);
175 para_install_sighandler(SIGTERM);
176 para_install_sighandler(SIGHUP);
177 signal(SIGPIPE, SIG_IGN);
178 }
179
180 static void clear_slot(int slot_num)
181 {
182 struct slot_info *s = &slot[slot_num];
183
184 PARA_INFO_LOG("clearing slot %d\n", slot_num);
185 memset(s, 0, sizeof(struct slot_info));
186 s->format = -1;
187 }
188
189 static void close_receiver(int slot_num)
190 {
191 struct slot_info *s = &slot[slot_num];
192 struct audio_format_info *a;
193
194 if (s->format < 0 || !s->receiver_node)
195 return;
196 a = &afi[s->format];
197 PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
198 audio_formats[s->format] , slot_num, s->receiver_node->eof);
199 a->receiver->close(s->receiver_node);
200 free(s->receiver_node);
201 s->receiver_node = NULL;
202 }
203
204 static void kill_all_decoders(void)
205 {
206 int i;
207
208 FOR_EACH_SLOT(i) {
209 struct slot_info *s = &slot[i];
210 if (s->wng && !s->wng->eof) {
211 PARA_INFO_LOG("unregistering writer node group in slot %d\n",
212 i);
213 wng_unregister(s->wng);
214 s->wng->eof = 1;
215 }
216 if (s->fc && !s->fc->eof) {
217 PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
218 unregister_task(&s->fc->task);
219 s->fc->eof = 1;
220 }
221 if (s->receiver_node && !s->receiver_node->eof) {
222 PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
223 unregister_task(&s->receiver_node->task);
224 s->receiver_node->eof = 1;
225 }
226 }
227 }
228
229 static int get_empty_slot(void)
230 {
231 int i;
232 struct slot_info *s;
233
234 FOR_EACH_SLOT(i) {
235 s = &slot[i];
236 if (s->format < 0) {
237 clear_slot(i);
238 return i;
239 }
240 if (s->wng || s->receiver_node || s->fc)
241 continue;
242 clear_slot(i);
243 return i;
244 }
245 return -E_NO_MORE_SLOTS;
246 }
247
248 /**
249 * get the number of filters
250 *
251 * \param audio_format_num the number identifying the audio format
252 *
253 * \return the number of filters for the given audio format
254 *
255 * \sa struct filter;
256 */
257 int num_filters(int audio_format_num)
258 {
259 return afi[audio_format_num].num_filters;
260 }
261
262 static void filter_event_handler(struct task *t)
263 {
264 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
265 struct filter_chain *fc = t->private_data;
266 fc->eof = 1;
267 unregister_task(t);
268 }
269
270 static void open_filters(int slot_num)
271 {
272 struct slot_info *s = &slot[slot_num];
273 struct audio_format_info *a = &afi[s->format];
274 int nf = a->num_filters;
275 int i;
276
277 s->fc = NULL;
278 if (!nf)
279 return;
280 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
281 s->fc = para_calloc(sizeof(struct filter_chain));
282 INIT_LIST_HEAD(&s->fc->filters);
283 s->fc->inbuf = s->receiver_node->buf;
284 s->fc->in_loaded = &s->receiver_node->loaded;
285 s->fc->input_eof = &s->receiver_node->eof;
286 s->fc->task.pre_select = filter_pre_select;
287 s->fc->task.event_handler = filter_event_handler;
288 s->fc->task.private_data = s->fc;
289 s->fc->eof = 0;
290
291 s->receiver_node->output_eof = &s->fc->eof;
292 sprintf(s->fc->task.status, "filter chain");
293 for (i = 0; i < nf; i++) {
294 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
295 fn->conf = a->filter_conf[i];
296 fn->fc = s->fc;
297 fn->filter = a->filters[i];
298 INIT_LIST_HEAD(&fn->callbacks);
299 list_add_tail(&fn->node, &s->fc->filters);
300 fn->filter->open(fn);
301 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
302 audio_formats[s->format], i + 1, nf,
303 fn->filter->name, slot_num);
304 s->fc->outbuf = fn->buf;
305 s->fc->out_loaded = &fn->loaded;
306 }
307 register_task(&s->fc->task);
308 }
309
310 static void wng_event_handler(struct task *t)
311 {
312 struct writer_node_group *wng = t->private_data;
313
314 PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
315 wng->eof = 1;
316 wng_unregister(wng);
317 }
318
319 static void open_writers(int slot_num)
320 {
321 int ret, i;
322 struct slot_info *s = &slot[slot_num];
323 struct audio_format_info *a = &afi[s->format];
324
325 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
326 if (!a->num_writers)
327 s->wng = setup_default_wng();
328 else
329 s->wng = wng_new(a->num_writers);
330 if (s->fc) {
331 s->wng->buf = s->fc->outbuf;
332 s->wng->loaded = s->fc->out_loaded;
333 s->wng->input_eof = &s->fc->eof;
334 s->wng->channels = &s->fc->channels;
335 s->wng->samplerate = &s->fc->samplerate;
336 s->fc->output_eof = &s->wng->eof;
337 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
338 } else {
339 s->wng->buf = s->receiver_node->buf;
340 s->wng->loaded = &s->receiver_node->loaded;
341 s->wng->input_eof = &s->receiver_node->eof;
342 }
343 s->wng->task.event_handler = wng_event_handler;
344 for (i = 0; i < a->num_writers; i++) {
345 s->wng->writer_nodes[i].conf = a->writer_conf[i];
346 s->wng->writer_nodes[i].writer = a->writers[i];
347 }
348 ret = wng_open(s->wng);
349 if (ret < 0) {
350 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
351 return;
352 }
353 s->wstime = *now;
354 activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
355 }
356
357 static void rn_event_handler(struct task *t)
358 {
359 struct receiver_node *rn = t->private_data;
360 const struct timeval restart_delay = {0, 10 * 1000};
361 int i;
362
363 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
364 unregister_task(t);
365 rn->eof = 1;
366 /* set restart barrier */
367 FOR_EACH_SLOT(i) {
368 if (slot[i].receiver_node != rn)
369 continue;
370 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
371 }
372 }
373
374 static int open_receiver(int format)
375 {
376 struct audio_format_info *a = &afi[format];
377 struct slot_info *s;
378 int ret, slot_num;
379 struct receiver_node *rn;
380 const struct timeval restart_delay = {1, 0};
381
382 ret = get_empty_slot();
383 if (ret < 0)
384 goto err;
385 slot_num = ret;
386 s = &slot[slot_num];
387 s->format = format;
388 s->receiver_node = para_calloc(sizeof(struct receiver_node));
389 rn = s->receiver_node;
390 rn->receiver = a->receiver;
391 rn->conf = a->receiver_conf;
392 ret = a->receiver->open(s->receiver_node);
393 if (ret < 0) {
394 free(s->receiver_node);
395 s->receiver_node = NULL;
396 goto err;
397 }
398 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
399 audio_formats[s->format], a->receiver->name, slot_num);
400 rn->task.private_data = s->receiver_node;
401 rn->task.pre_select = a->receiver->pre_select;
402 rn->task.post_select = a->receiver->post_select;
403 rn->task.event_handler = rn_event_handler;
404 sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
405 register_task(&rn->task);
406 return 1;
407 err:
408 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
409 tv_add(now, &restart_delay, &afi[format].restart_barrier);
410 return ret;
411 }
412
413 static int receiver_running(int format)
414 {
415 int i;
416
417 FOR_EACH_SLOT(i) {
418 struct slot_info *s = &slot[i];
419 if (s->format == format && s->receiver_node
420 && !s->receiver_node->eof)
421 return 1;
422 }
423 return 0;
424 }
425
426 static int open_current_receiver(struct sched *s)
427 {
428 int i;
429 struct timeval diff;
430 char *audio_format = stat_task->stat_item_values[SI_FORMAT];
431
432 if (!audio_format || !stat_task->pcd)
433 return 0;
434 i = get_audio_format_num(audio_format + strlen(
435 status_item_list[SI_FORMAT]) + 1);
436 if (i < 0)
437 return 0;
438 if (receiver_running(i))
439 return 0;
440 if (tv_diff(now, &afi[i].restart_barrier, &diff) < 0) {
441 s->timeout = diff;
442 return 0;
443 }
444 return open_receiver(i) < 0? 0 : 1;
445 }
446
447 static unsigned compute_time_diff(const struct timeval *status_time)
448 {
449 struct timeval tmp, diff;
450 static unsigned count;
451 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
452 const struct timeval max_deviation = {0, 500 * 1000};
453 const int time_smooth = 5;
454
455 if (!status_time)
456 return count;
457 sign = tv_diff(status_time, now, &diff);
458 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
459 // sign, sa_time_diff_sign);
460 if (!count) {
461 sa_time_diff_sign = sign;
462 stat_task->sa_time_diff = diff;
463 count++;
464 goto out;
465 }
466 if (count > 5) {
467 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
468 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
469 PARA_WARNING_LOG("time diff jump: %lims\n",
470 s * tv2ms(&tmp));
471 }
472 count++;
473 sa_time_diff_sign = tv_convex_combination(
474 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
475 count > 10? sign : sign * time_smooth, &diff,
476 &tmp);
477 stat_task->sa_time_diff = tmp;
478 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
479 sign > 0? "+" : "-",
480 tv2ms(&diff),
481 sa_time_diff_sign ? "+" : "-",
482 tv2ms(&stat_task->sa_time_diff)
483 );
484 out:
485 stat_task->sa_time_diff_sign = sa_time_diff_sign;
486 return count;
487 }
488
489 static int check_stat_line(char *line, __a_unused void *data)
490 {
491 int itemnum;
492 size_t ilen = 0;
493 long unsigned sec, usec;
494 char *tmp;
495
496 // PARA_INFO_LOG("line: %s\n", line);
497 if (!line)
498 return 1;
499 itemnum = stat_line_valid(line);
500 if (itemnum < 0) {
501 PARA_WARNING_LOG("invalid status line: %s\n", line);
502 return 1;
503 }
504 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
505 return 1;
506 tmp = make_message("%s\n", line);
507 stat_client_write(tmp, itemnum);
508 free(tmp);
509 free(stat_task->stat_item_values[itemnum]);
510 stat_task->stat_item_values[itemnum] = para_strdup(line);
511 ilen = strlen(status_item_list[itemnum]);
512 switch (itemnum) {
513 case SI_STATUS:
514 stat_task->playing = strstr(line, "playing")? 1 : 0;
515 break;
516 case SI_OFFSET:
517 stat_task->offset_seconds = atoi(line + ilen + 1);
518 break;
519 case SI_LENGTH:
520 stat_task->length_seconds = atoi(line + ilen + 1);
521 break;
522 case SI_STREAM_START:
523 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
524 struct timeval a_start, delay;
525 delay.tv_sec = conf.stream_delay_arg / 1000;
526 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
527 stat_task->server_stream_start.tv_sec = sec;
528 stat_task->server_stream_start.tv_usec = usec;
529 if (compute_time_diff(NULL) > 2) {
530 if (stat_task->sa_time_diff_sign < 0)
531 tv_add(&stat_task->server_stream_start,
532 &stat_task->sa_time_diff, &a_start);
533 else
534 tv_diff(&stat_task->server_stream_start,
535 &stat_task->sa_time_diff, &a_start);
536 tv_add(&a_start, &delay, &initial_delay_barrier);
537 }
538 }
539 break;
540 case SI_CURRENT_TIME:
541 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
542 struct timeval tv = {sec, usec};
543 compute_time_diff(&tv);
544 }
545 if (stat_task->clock_diff_count)
546 stat_task->clock_diff_count--;
547 break;
548 }
549 return 1;
550 }
551
552 static void try_to_close_slot(int slot_num)
553 {
554 struct slot_info *s = &slot[slot_num];
555
556 if (s->format < 0)
557 return;
558 if (s->receiver_node && !s->receiver_node->eof)
559 return;
560 if (s->fc && !s->fc->eof)
561 return;
562 if (s->wng && !s->wng->eof)
563 return;
564 PARA_INFO_LOG("closing slot %d \n", slot_num);
565 wng_close(s->wng);
566 close_filters(s->fc);
567 free(s->fc);
568 close_receiver(slot_num);
569 clear_slot(slot_num);
570 }
571
572 /*
573 * Check if any receivers/filters/writers need to be started and do so if
574 * neccessary. Since the pre_select function didn't have a chance yet to put
575 * file descriptors into the fd sets given by s, make the upcoming select()
576 * return immediately to avoid a long timeout in case we started something.
577 */
578 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
579 {
580 int i;
581 struct timeval min_delay = {0, 1};
582
583 t->ret = 1;
584 if (audiod_status != AUDIOD_ON || !stat_task->playing)
585 return kill_all_decoders();
586 if (open_current_receiver(s))
587 s->timeout = min_delay;
588 FOR_EACH_SLOT(i) {
589 struct slot_info *sl = &slot[i];
590 struct audio_format_info *a;
591 struct timeval diff;
592
593 if (sl->format < 0)
594 continue;
595 a = &afi[sl->format];
596 if (!sl->receiver_node)
597 continue;
598 if (!a->num_filters) {
599 if (sl->receiver_node->loaded && !sl->wng) {
600 open_writers(i);
601 s->timeout = min_delay;
602 }
603 continue;
604 }
605 if (sl->receiver_node->loaded && !sl->fc) {
606 open_filters(i);
607 s->timeout = min_delay;
608 continue;
609 }
610 if (!sl->fc || !*sl->fc->out_loaded || sl->wng)
611 continue;
612 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
613 open_writers(i);
614 s->timeout = min_delay;
615 continue;
616 }
617 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
618 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
619 s->timeout = diff;
620 }
621 }
622 }
623
624 static void audiod_post_select(__a_unused struct sched *s,
625 __a_unused struct task *t)
626 {
627 int i;
628
629 t->ret = 1;
630 FOR_EACH_SLOT(i)
631 try_to_close_slot(i);
632 }
633
634 static void init_audiod_task(struct task *t)
635 {
636 t->pre_select = audiod_pre_select;
637 t->post_select = audiod_post_select;
638 t->event_handler = NULL;
639 t->private_data = t;
640 sprintf(t->status, "audiod task");
641 }
642
643 static int parse_stream_command(const char *txt, char **cmd)
644 {
645 char *p = strchr(txt, ':');
646 int i;
647
648 if (!p)
649 return -E_MISSING_COLON;
650 p++;
651 FOR_EACH_AUDIO_FORMAT(i) {
652 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
653 continue;
654 *cmd = p;
655 return i;
656 }
657 return -E_UNSUPPORTED_AUDIO_FORMAT;
658 }
659
660 static int add_filter(int format, char *cmdline)
661 {
662 struct audio_format_info *a = &afi[format];
663 int filter_num, nf = a->num_filters;
664
665 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
666 if (filter_num < 0)
667 return filter_num;
668 a->filters[nf] = &filters[filter_num];
669 a->num_filters++;
670 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
671 a->filters[nf]->name);
672 return filter_num;
673 }
674
675 static int init_writers(void)
676 {
677 int i, ret, nw;
678 char *cmd;
679 struct audio_format_info *a;
680
681 init_supported_writers();
682 nw = PARA_MAX(1, conf.writer_given);
683 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
684 FOR_EACH_AUDIO_FORMAT(i) {
685 a = &afi[i];
686 a->writer_conf = para_malloc(nw * sizeof(void *));
687 a->writers = para_malloc(nw * sizeof(struct writer *));
688 a->num_writers = 0;
689 }
690 for (i = 0; i < conf.writer_given; i++) {
691 void *wconf;
692 int writer_num;
693 ret = parse_stream_command(conf.writer_arg[i], &cmd);
694 if (ret < 0)
695 goto out;
696 a = &afi[ret];
697 nw = a->num_writers;
698 wconf = check_writer_arg(cmd, &writer_num);
699 if (!wconf) {
700 ret = writer_num;
701 goto out;
702 }
703 a->writers[nw] = &writers[writer_num];
704 a->writer_conf[nw] = wconf;
705 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
706 nw, writer_names[writer_num]);
707 a->num_writers++;
708 }
709 ret = 1;
710 out:
711 return ret;
712 }
713
714 static int init_receivers(void)
715 {
716 int i, ret, receiver_num;
717 char *cmd = NULL;
718 struct audio_format_info *a;
719
720 for (i = 0; receivers[i].name; i++) {
721 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
722 receivers[i].init(&receivers[i]);
723 }
724 for (i = conf.receiver_given - 1; i >= 0; i--) {
725 char *arg = conf.receiver_arg[i];
726 char *recv_arg = strchr(arg, ':');
727 ret = -E_MISSING_COLON;
728 if (!recv_arg)
729 goto out;
730 *recv_arg = '\0';
731 recv_arg++;
732 ret = get_audio_format_num(arg);
733 if (ret < 0)
734 goto out;
735 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
736 if (!afi[ret].receiver_conf) {
737 ret = -E_RECV_SYNTAX;
738 goto out;
739 }
740 afi[ret].receiver = &receivers[receiver_num];
741 }
742 /* use the first available receiver with no arguments
743 * for those audio formats for which no receiver
744 * was specified
745 */
746 cmd = para_strdup(receivers[0].name);
747 FOR_EACH_AUDIO_FORMAT(i) {
748 a = &afi[i];
749 if (a->receiver_conf)
750 continue;
751 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
752 if (!a->receiver_conf)
753 return -E_RECV_SYNTAX;
754 a->receiver = &receivers[receiver_num];
755 }
756 ret = 1;
757 out:
758 free(cmd);
759 return ret;
760 }
761
762 static int init_default_filters(void)
763 {
764 int i, ret = 1;
765
766 FOR_EACH_AUDIO_FORMAT(i) {
767 struct audio_format_info *a = &afi[i];
768 char *tmp;
769 int j;
770
771 if (a->num_filters)
772 continue; /* no default -- nothing to to */
773 /* add "dec" to audio format name */
774 tmp = make_message("%sdec", audio_formats[i]);
775 for (j = 0; filters[j].name; j++)
776 if (!strcmp(tmp, filters[j].name))
777 break;
778 free(tmp);
779 ret = -E_UNSUPPORTED_FILTER;
780 if (!filters[j].name)
781 goto out;
782 tmp = para_strdup(filters[j].name);
783 ret = add_filter(i, tmp);
784 free(tmp);
785 if (ret < 0)
786 goto out;
787 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
788 filters[j].name);
789 }
790 out:
791 return ret;
792 }
793
794 static int init_filters(void)
795 {
796 int i, ret, nf;
797
798 filter_init(filters);
799 nf = PARA_MAX(1, conf.filter_given);
800 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
801 FOR_EACH_AUDIO_FORMAT(i) {
802 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
803 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
804 }
805 if (!conf.no_default_filters_given)
806 return init_default_filters();
807 for (i = 0; i < conf.filter_given; i++) {
808 char *arg = conf.filter_arg[i];
809 char *filter_name = strchr(arg, ':');
810 ret = -E_MISSING_COLON;
811 if (!filter_name)
812 goto out;
813 *filter_name = '\0';
814 filter_name++;
815 ret = get_audio_format_num(arg);
816 if (ret < 0)
817 goto out;
818 ret = add_filter(ret, filter_name);
819 if (ret < 0)
820 goto out;
821 }
822 ret = init_default_filters(); /* use default values for the rest */
823 out:
824 return ret;
825 }
826
827 static int init_stream_io(void)
828 {
829 int ret;
830
831 ret = init_writers();
832 if (ret < 0)
833 return ret;
834 ret = init_receivers();
835 if (ret < 0)
836 return ret;
837 ret = init_filters();
838 if (ret < 0)
839 return ret;
840 return 1;
841 }
842
843 static int audiod_get_socket(void)
844 {
845 struct sockaddr_un unix_addr;
846 int fd;
847
848 if (conf.socket_given)
849 socket_name = para_strdup(conf.socket_arg);
850 else {
851 char *hn = para_hostname();
852 socket_name = make_message("/var/paraslash/audiod_socket.%s",
853 hn);
854 free(hn);
855 }
856 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
857 if (conf.force_given)
858 unlink(socket_name);
859 fd = create_local_socket(socket_name, &unix_addr,
860 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
861 if (fd < 0) {
862 PARA_EMERG_LOG("can not connect to socket\n");
863 exit(EXIT_FAILURE); /* do not unlink socket */
864 }
865 if (listen(fd , 5) < 0) {
866 PARA_EMERG_LOG("can not listen on socket\n");
867 exit(EXIT_FAILURE); /* do not unlink socket */
868 }
869 mark_fd_nonblock(fd);
870 return fd;
871 }
872
873 static void signal_event_handler(struct task *t)
874 {
875 struct signal_task *st = t->private_data;
876
877 switch (st->signum) {
878 case SIGINT:
879 case SIGTERM:
880 case SIGHUP:
881 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
882 clean_exit(EXIT_FAILURE, "caught deadly signal");
883 }
884 }
885
886 static void signal_pre_select(struct sched *s, struct task *t)
887 {
888 struct signal_task *st = t->private_data;
889 t->ret = 1;
890 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
891 }
892
893 static void signal_post_select(struct sched *s, struct task *t)
894 {
895 struct signal_task *st = t->private_data;
896 t->ret = 1;
897 if (!FD_ISSET(st->fd, &s->rfds))
898 return;
899 t->ret = -E_SIGNAL_CAUGHT;
900 st->signum = para_next_signal();
901 }
902
903 static void signal_setup_default(struct signal_task *st)
904 {
905 st->task.pre_select = signal_pre_select;
906 st->task.post_select = signal_post_select;
907 st->task.private_data = st;
908 sprintf(st->task.status, "signal task");
909 }
910
911 static void command_pre_select(struct sched *s, struct task *t)
912 {
913 struct command_task *ct = t->private_data;
914 t->ret = 1;
915 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
916
917 }
918
919 static void command_post_select(struct sched *s, struct task *t)
920 {
921 int ret;
922 struct command_task *ct = t->private_data;
923
924 t->ret = 1; /* always successful */
925 audiod_status_dump();
926 if (!FD_ISSET(ct->fd, &s->rfds))
927 return;
928 ret = handle_connect(ct->fd);
929 if (ret < 0)
930 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
931 }
932
933 static void init_command_task(struct command_task *ct)
934 {
935 ct->task.pre_select = command_pre_select;
936 ct->task.post_select = command_post_select;
937 ct->task.event_handler = NULL;
938 ct->task.private_data = ct;
939 ct->fd = audiod_get_socket(); /* doesn't return on errors */
940 sprintf(ct->task.status, "command task");
941 }
942
943 static void close_stat_pipe(void)
944 {
945 int i;
946
947 if (!stat_task->pcd)
948 return;
949 client_close(stat_task->pcd);
950 stat_task->pcd = NULL;
951 for (i = 0; i < NUM_STAT_ITEMS; i++) {
952 free(stat_task->stat_item_values[i]);
953 stat_task->stat_item_values[i] = NULL;
954 }
955 dump_empty_status();
956 stat_task->length_seconds = 0;
957 stat_task->offset_seconds = 0;
958 audiod_status_dump();
959 stat_task->playing = 0;
960 stat_task->stat_item_values[SI_STATUS_BAR] = make_message(
961 "%s:no connection to para_server\n",
962 status_item_list[SI_STATUS_BAR]);
963 stat_client_write(stat_task->stat_item_values[SI_STATUS_BAR],
964 SI_STATUS_BAR);
965 if (stat_task->clock_diff_count) {
966 stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
967 stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
968 }
969 }
970
971 /**
972 * close the connection to para_server and exit
973 *
974 * \param status the exit status which is passed to exit(3)
975 * \param msg the log message
976 *
977 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
978 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
979 * EXIT_FAILURE.
980 *
981 * \sa exit(3)
982 */
983 void __noreturn clean_exit(int status, const char *msg)
984 {
985 PARA_EMERG_LOG("%s\n", msg);
986 if (socket_name)
987 unlink(socket_name);
988 close_stat_pipe();
989 exit(status);
990 }
991
992 /* avoid busy loop if server is down */
993 static void set_stat_task_restart_barrier(void)
994 {
995 struct timeval delay = {5, 0};
996 tv_add(now, &delay, &stat_task->restart_barrier);
997 }
998
999 static void client_task_event_handler(__a_unused struct task *t)
1000 {
1001 int i;
1002
1003 if (t->ret == -E_HANDSHAKE_COMPLETE)
1004 return;
1005 unregister_task(t);
1006 close_stat_pipe();
1007 if (t->ret != -E_SERVER_EOF)
1008 stat_task->clock_diff_count = conf.clock_diff_count_arg;
1009 set_stat_task_restart_barrier();
1010 FOR_EACH_AUDIO_FORMAT(i)
1011 afi[i].restart_barrier = stat_task->restart_barrier;
1012 }
1013
1014 static void status_pre_select(struct sched *s, struct task *t)
1015 {
1016 struct status_task *st = t->private_data;
1017 int ret;
1018
1019 t->ret = 1; /* always successful */
1020 if (st->pcd || audiod_status == AUDIOD_OFF)
1021 return;
1022 if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
1023 < 0)
1024 return;
1025 if (st->clock_diff_count) {
1026 char *argv[] = {"audiod", "stat", "1", NULL};
1027 int argc = 3;
1028 if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
1029 return;
1030 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1031 ret = client_open(argc, argv, &st->pcd);
1032
1033 } else {
1034 char *argv[] = {"audiod", "stat", NULL};
1035 int argc = 2;
1036 ret = client_open(argc, argv, &st->pcd);
1037 }
1038 set_stat_task_restart_barrier();
1039 if (ret < 0)
1040 return;
1041 st->pcd->task.event_handler = client_task_event_handler;
1042 s->timeout.tv_sec = 0;
1043 s->timeout.tv_usec = 1;
1044 }
1045
1046 static void status_post_select(__a_unused struct sched *s, struct task *t)
1047 {
1048 struct status_task *st = t->private_data;
1049 unsigned bytes_left;
1050
1051 t->ret = 1;
1052 if (!st->pcd || st->pcd->status != CL_RECEIVING)
1053 return;
1054 if (st->pcd && audiod_status == AUDIOD_OFF) {
1055 unregister_task(&st->pcd->task);
1056 close_stat_pipe();
1057 st->clock_diff_count = conf.clock_diff_count_arg;
1058 return;
1059 }
1060 bytes_left = for_each_line(st->pcd->buf, st->pcd->loaded,
1061 &check_stat_line, NULL);
1062 if (st->pcd->loaded != bytes_left) {
1063 st->last_status_read = *now;
1064 st->pcd->loaded = bytes_left;
1065 } else {
1066 struct timeval diff;
1067 tv_diff(now, &st->last_status_read, &diff);
1068 if (diff.tv_sec > 61)
1069 close_stat_pipe();
1070 }
1071 }
1072
1073 static void init_status_task(struct status_task *st)
1074 {
1075 memset(st, 0, sizeof(struct status_task));
1076 st->task.pre_select = status_pre_select;
1077 st->task.post_select = status_post_select;
1078 st->task.private_data = st;
1079 st->sa_time_diff_sign = 1;
1080 st->clock_diff_count = conf.clock_diff_count_arg;
1081 sprintf(st->task.status, "status task");
1082 }
1083
1084 static void set_initial_status(void)
1085 {
1086 audiod_status = AUDIOD_ON;
1087 if (!conf.mode_given)
1088 return;
1089 if (!strcmp(conf.mode_arg, "sb")) {
1090 audiod_status = AUDIOD_STANDBY;
1091 return;
1092 }
1093 if (!strcmp(conf.mode_arg, "off")) {
1094 audiod_status = AUDIOD_OFF;
1095 return;
1096 }
1097 if (strcmp(conf.mode_arg, "on"))
1098 PARA_WARNING_LOG("%s", "invalid mode\n");
1099 }
1100
1101 /**
1102 * the main function of para_audiod
1103 *
1104 * \param argc usual argument count
1105 * \param argv usual argument vector
1106 *
1107 * \return EXIT_SUCCESS or EXIT_FAILURE
1108 *
1109 * \sa para_audiod(1)
1110 * */
1111 int main(int argc, char *argv[])
1112 {
1113 char *config_file;
1114 int ret, i;
1115 struct sched s;
1116 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1117 struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1118
1119 valid_fd_012();
1120 audiod_cmdline_parser(argc, argv, &conf);
1121 HANDLE_VERSION_FLAG("audiod", conf);
1122 para_drop_privileges(conf.user_arg, conf.group_arg);
1123 config_file = configfile_exists();
1124 if (config_file) {
1125 struct audiod_cmdline_parser_params params = {
1126 .override = 0,
1127 .initialize = 0,
1128 .check_required = 0,
1129 .check_ambiguity = 0
1130
1131 };
1132 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1133 PARA_EMERG_LOG("%s", "parse error in config file\n");
1134 exit(EXIT_FAILURE);
1135 }
1136 free(config_file);
1137 }
1138 if (conf.logfile_given)
1139 logfile = open_log(conf.logfile_arg);
1140 log_welcome("para_audiod", conf.loglevel_arg);
1141 i = init_stream_io();
1142 if (i < 0) {
1143 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1144 exit(EXIT_FAILURE);
1145 }
1146 server_uptime(UPTIME_SET);
1147 set_initial_status();
1148 FOR_EACH_SLOT(i)
1149 clear_slot(i);
1150 init_grabbing();
1151 setup_signal_handling();
1152 signal_setup_default(sig_task);
1153 sig_task->task.event_handler = signal_event_handler;
1154
1155 init_status_task(stat_task);
1156 init_command_task(cmd_task);
1157 init_audiod_task(audiod_task);
1158
1159 if (conf.daemon_given)
1160 daemon_init();
1161
1162 register_task(&sig_task->task);
1163 register_task(&cmd_task->task);
1164 register_task(&stat_task->task);
1165 register_task(audiod_task);
1166 s.default_timeout.tv_sec = 0;
1167 s.default_timeout.tv_usec = 99 * 1000;
1168 ret = sched(&s);
1169
1170 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1171 return EXIT_FAILURE;
1172 }