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[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2006 Andre Noll <noll@mathematik.tu-darmstadt.de>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file audiod.c the paraslash's audio daemon */
20
21 #include "para.h"
22
23 #include "audiod.cmdline.h"
24 #include "list.h"
25 #include "close_on_fork.h"
26 #include "sched.h"
27 #include "recv.h"
28 #include "filter.h"
29 #include "grab_client.cmdline.h"
30 #include "grab_client.h"
31
32 #include "error.h"
33 #include "audiod.h"
34 #include "net.h"
35 #include "daemon.h"
36 #include "string.h"
37 #include "fd.h"
38 #include "write.h"
39 #include "write_common.h"
40
41 /** define the array of error lists needed by para_audiod */
42 INIT_AUDIOD_ERRLISTS;
43 /** define the array containing all supported audio formats */
44 DEFINE_AUDIO_FORMAT_ARRAY;
45
46 /** defines how to handle one supported audio format */
47 struct audio_format_info {
48 /** pointer to the receiver for this audio format */
49 struct receiver *receiver;
50 /** the receiver configuration */
51 void *receiver_conf;
52 /** the number of filters that should be activated for this audio format */
53 unsigned int num_filters;
54 /** pointer to the array of filters to be activated */
55 struct filter **filters;
56 /** pointer to the array of filter configurations */
57 void **filter_conf;
58 /** the number of filters that should be activated for this audio format */
59 unsigned int num_writers;
60 /** pointer to the array of writers to be activated */
61 struct writer **writers;
62 /** pointer to the array of writer configurations */
63 void **writer_conf;
64 /** do not start receiver/filters/writer before this time */
65 struct timeval restart_barrier;
66 };
67
68 struct slot_info slot[MAX_STREAM_SLOTS];
69
70
71 int audiod_status = AUDIOD_ON;
72
73 struct gengetopt_args_info conf;
74 static char *socket_name;
75 static FILE *logfile;
76 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
77
78 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
79
80 static struct status_task status_task_struct;
81 struct status_task *stat_task = &status_task_struct;
82
83 /**
84 * the task for handling audiod commands
85 *
86 * \sa struct task, struct sched
87 */
88 struct command_task {
89 /** the local listening socket */
90 int fd;
91 /** the associated task structure */
92 struct task task;
93 };
94
95 struct signal_task {
96 int fd;
97 int signum;
98 struct task task;
99 };
100
101 /** iterate over all supported audio formats */
102 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
103
104 /**
105 * get the audio format number
106 * \param name the name of the audio format
107 *
108 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
109 * \a name is not a supported audio format.
110 */
111 int get_audio_format_num(char *name)
112 {
113 int i;
114 FOR_EACH_AUDIO_FORMAT(i)
115 if (!strcmp(name, audio_formats[i]))
116 return i;
117 return -E_UNSUPPORTED_AUDIO_FORMAT;
118 }
119
120 /*
121 * log function. first argument is loglevel.
122 */
123 void para_log(int ll, const char* fmt,...)
124 {
125 va_list argp;
126 FILE *outfd;
127 struct tm *tm;
128 time_t t1;
129 char str[MAXLINE] = "";
130 static char *hostname;
131
132 if (ll < conf.loglevel_arg)
133 return;
134 if (!hostname)
135 hostname = para_hostname();
136 outfd = logfile? logfile : stderr;
137 time(&t1);
138 tm = localtime(&t1);
139 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
140 fprintf(outfd, "%s %s ", str, hostname);
141 if (conf.loglevel_arg <= INFO)
142 fprintf(outfd, "%i ", ll);
143 va_start(argp, fmt);
144 vfprintf(outfd, fmt, argp);
145 va_end(argp);
146 }
147
148 static char *configfile_exists(void)
149 {
150 static char *config_file;
151
152 if (!config_file) {
153 char *home = para_homedir();
154 config_file = make_message("%s/.paraslash/audiod.conf", home);
155 free(home);
156 }
157 return file_exists(config_file)? config_file : NULL;
158 }
159
160 static void setup_signal_handling(void)
161 {
162 sig_task->fd = para_signal_init();
163 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
164 para_install_sighandler(SIGINT);
165 para_install_sighandler(SIGTERM);
166 para_install_sighandler(SIGCHLD);
167 para_install_sighandler(SIGHUP);
168 para_install_sighandler(SIGPIPE);
169 // signal(SIGPIPE, SIG_IGN);
170 }
171
172 static void clear_slot(int slot_num)
173 {
174 struct slot_info *s = &slot[slot_num];
175
176 PARA_INFO_LOG("clearing slot %d\n", slot_num);
177 memset(s, 0, sizeof(struct slot_info));
178 s->format = -1;
179 }
180
181 static void close_receiver(int slot_num)
182 {
183 struct slot_info *s = &slot[slot_num];
184 struct audio_format_info *a;
185 const struct timeval restart_delay = {0, 200 * 1000};
186
187 if (s->format < 0 || !s->receiver_node)
188 return;
189 a = &afi[s->format];
190 PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
191 audio_formats[s->format] , slot_num, s->receiver_node->eof);
192 // if (!s->receiver_node->eof)
193 // unregister_task(&s->receiver_node->task);
194 a->receiver->close(s->receiver_node);
195 free(s->receiver_node);
196 s->receiver_node = NULL;
197 /* set restart barrier */
198 tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
199 }
200
201 static void kill_all_decoders(void)
202 {
203 int i;
204
205 FOR_EACH_SLOT(i) {
206 struct slot_info *s = &slot[i];
207 if (s->wng && !s->wng->eof) {
208 PARA_INFO_LOG("unregistering writer node group in slot %d\n",
209 i);
210 wng_unregister(s->wng);
211 s->wng->eof = 1;
212 }
213 if (s->fc && !s->fc->eof) {
214 PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
215 unregister_task(&s->fc->task);
216 s->fc->eof = 1;
217 }
218 if (s->receiver_node && !s->receiver_node->eof) {
219 PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
220 unregister_task(&s->receiver_node->task);
221 s->receiver_node->eof = 1;
222 }
223 }
224 }
225
226 static int get_empty_slot(void)
227 {
228 int i;
229 struct slot_info *s;
230
231 FOR_EACH_SLOT(i) {
232 s = &slot[i];
233 if (s->format < 0) {
234 clear_slot(i);
235 return i;
236 }
237 if (s->wng || s->receiver_node || s->fc)
238 continue;
239 clear_slot(i);
240 return i;
241 }
242 return -E_NO_MORE_SLOTS;
243 }
244
245 static int decoder_running(int format)
246 {
247 int i, ret = 0;
248 struct slot_info *s;
249
250 FOR_EACH_SLOT(i) {
251 s = &slot[i];
252 if (s->format == format && s->receiver_node)
253 ret |= 1;
254 if (s->format == format && s->wng)
255 ret |= 2;
256 }
257 return ret;
258 }
259
260 static void close_stat_pipe(void)
261 {
262 int i;
263
264 if (stat_task->fd < 0)
265 return;
266 PARA_NOTICE_LOG("%s", "closing status pipe\n");
267 close(stat_task->fd);
268 del_close_on_fork_list(stat_task->fd);
269 stat_task->fd = -1;
270 // kill_all_decoders();
271 for (i = 0; i < NUM_STAT_ITEMS; i++) {
272 free(stat_task->stat_item_values[i]);
273 stat_task->stat_item_values[i] = NULL;
274 }
275 dump_empty_status();
276 stat_task->length_seconds = 0;
277 stat_task->offset_seconds = 0;
278 audiod_status_dump();
279 stat_task->playing = 0;
280 stat_task->stat_item_values[SI_STATUS_BAR] = make_message(
281 "%s:no connection to para_server\n",
282 status_item_list[SI_STATUS_BAR]);
283 stat_client_write(stat_task->stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
284 }
285
286 void __noreturn clean_exit(int status, const char *msg)
287 {
288 PARA_EMERG_LOG("%s\n", msg);
289 if (socket_name)
290 unlink(socket_name);
291 if (stat_task->fd >= 0)
292 close_stat_pipe();
293 exit(status);
294 }
295
296 /**
297 * get the number of filters
298 *
299 * \param audio_format_num the number identifying the audio format
300 *
301 * \return the number of filters for the given audio format
302 *
303 * \sa struct filter;
304 */
305 int num_filters(int audio_format_num)
306 {
307 return afi[audio_format_num].num_filters;
308 }
309
310 static void filter_event_handler(struct task *t)
311 {
312 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
313 struct filter_chain *fc = t->private_data;
314 fc->eof = 1;
315 unregister_task(t);
316 }
317
318 static void open_filters(int slot_num)
319 {
320 struct slot_info *s = &slot[slot_num];
321 struct audio_format_info *a = &afi[s->format];
322 int nf = a->num_filters;
323 int i;
324
325 s->fc = NULL;
326 if (!nf)
327 return;
328 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
329 s->fc = para_calloc(sizeof(struct filter_chain));
330 INIT_LIST_HEAD(&s->fc->filters);
331 s->fc->inbuf = s->receiver_node->buf;
332 s->fc->in_loaded = &s->receiver_node->loaded;
333 s->fc->input_eof = &s->receiver_node->eof;
334 s->fc->task.pre_select = filter_pre_select;
335 s->fc->task.event_handler = filter_event_handler;
336 s->fc->task.private_data = s->fc;
337 s->fc->eof = 0;
338
339 s->receiver_node->output_eof = &s->fc->eof;
340 sprintf(s->fc->task.status, "filter chain");
341 for (i = 0; i < nf; i++) {
342 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
343 fn->conf = a->filter_conf[i];
344 fn->fc = s->fc;
345 fn->filter = a->filters[i];
346 INIT_LIST_HEAD(&fn->callbacks);
347 list_add_tail(&fn->node, &s->fc->filters);
348 fn->filter->open(fn);
349 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
350 audio_formats[s->format], i + 1, nf,
351 fn->filter->name, slot_num);
352 s->fc->outbuf = fn->buf;
353 s->fc->out_loaded = &fn->loaded;
354 }
355 register_task(&s->fc->task);
356 }
357
358 static void wng_event_handler(struct task *t)
359 {
360 struct writer_node_group *wng = t->private_data;
361
362 PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
363 wng->eof = 1;
364 wng_unregister(wng);
365 }
366
367 static void open_writers(int slot_num)
368 {
369 int ret, i;
370 struct slot_info *s = &slot[slot_num];
371 struct audio_format_info *a = &afi[s->format];
372
373 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
374 if (!a->num_writers)
375 s->wng = setup_default_wng();
376 else
377 s->wng = wng_new(a->num_writers);
378 if (s->fc) {
379 s->wng->buf = s->fc->outbuf;
380 s->wng->loaded = s->fc->out_loaded;
381 s->wng->input_eof = &s->fc->eof;
382 s->wng->channels = &s->fc->channels;
383 s->wng->samplerate = &s->fc->samplerate;
384 s->fc->output_eof = &s->wng->eof;
385 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
386 } else {
387 s->wng->buf = s->receiver_node->buf;
388 s->wng->loaded = &s->receiver_node->loaded;
389 s->wng->input_eof = &s->receiver_node->eof;
390 }
391 s->wng->task.event_handler = wng_event_handler;
392 for (i = 0; i < a->num_writers; i++) {
393 s->wng->writer_nodes[i].conf = a->writer_conf[i];
394 s->wng->writer_nodes[i].writer = a->writers[i];
395 }
396 ret = wng_open(s->wng);
397 if (ret < 0) {
398 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
399 return;
400 }
401 s->wstime = *now;
402 activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
403 }
404
405 static void rn_event_handler(struct task *t)
406 {
407 struct receiver_node *rn = t->private_data;
408
409 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
410 unregister_task(t);
411 rn->eof = 1;
412 }
413
414 static void open_receiver(int format)
415 {
416 struct audio_format_info *a = &afi[format];
417 struct slot_info *s;
418 int ret, slot_num;
419 struct receiver_node *rn;
420
421 slot_num = get_empty_slot();
422 if (slot_num < 0)
423 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
424 s = &slot[slot_num];
425 s->format = format;
426 s->receiver_node = para_calloc(sizeof(struct receiver_node));
427 rn = s->receiver_node;
428 rn->receiver = a->receiver;
429 rn->conf = a->receiver_conf;
430 ret = a->receiver->open(s->receiver_node);
431 if (ret < 0) {
432 PARA_ERROR_LOG("failed to open receiver (%s)\n",
433 PARA_STRERROR(-ret));
434 free(s->receiver_node);
435 s->receiver_node = NULL;
436 return;
437 }
438 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
439 audio_formats[s->format], a->receiver->name, slot_num);
440 rn->task.private_data = s->receiver_node;
441 rn->task.pre_select = a->receiver->pre_select;
442 rn->task.post_select = a->receiver->post_select;
443 rn->task.event_handler = rn_event_handler;
444 sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
445 register_task(&rn->task);
446 }
447
448 static int open_current_receiver(struct sched *s)
449 {
450 int i;
451 struct timeval diff;
452
453 if (!stat_task->af_status)
454 return 0;
455 i = get_audio_format_num(stat_task->af_status);
456 if (i < 0)
457 return 0;
458 if (decoder_running(i))
459 return 0;
460 if (tv_diff(now, &afi[i].restart_barrier, &diff) < 0) {
461 s->timeout = diff;
462 return 0;
463 }
464 open_receiver(i);
465 return 1;
466 }
467
468 static void compute_time_diff(const struct timeval *status_time)
469 {
470 struct timeval tmp, diff;
471 static int count;
472 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
473 const struct timeval max_deviation = {0, 500 * 1000};
474 const int time_smooth = 5;
475
476 sign = tv_diff(status_time, now, &diff);
477 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
478 // sign, sa_time_diff_sign);
479 if (!count) {
480 sa_time_diff_sign = sign;
481 stat_task->sa_time_diff = diff;
482 count++;
483 return;
484 }
485 if (count > 5) {
486 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
487 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
488 PARA_WARNING_LOG("time diff jump: %lims\n",
489 s * tv2ms(&tmp));
490 }
491 count++;
492 sa_time_diff_sign = tv_convex_combination(
493 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
494 count > 10? sign : sign * time_smooth, &diff,
495 &tmp);
496 stat_task->sa_time_diff = tmp;
497 PARA_DEBUG_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
498 sign > 0? "+" : "-",
499 tv2ms(&diff),
500 sa_time_diff_sign ? "+" : "-",
501 tv2ms(&stat_task->sa_time_diff)
502 );
503 }
504
505 static void check_stat_line(char *line)
506 {
507 int itemnum;
508 size_t ilen = 0;
509 long unsigned sec, usec;
510 char *tmp;
511
512 // PARA_INFO_LOG("line: %s\n", line);
513 if (!line)
514 return;
515 itemnum = stat_line_valid(line);
516 if (itemnum < 0) {
517 PARA_WARNING_LOG("invalid status line: %s\n", line);
518 return;
519 }
520 tmp = make_message("%s\n", line);
521 stat_client_write(tmp, itemnum);
522 free(tmp);
523 free(stat_task->stat_item_values[itemnum]);
524 stat_task->stat_item_values[itemnum] = para_strdup(line);
525 ilen = strlen(status_item_list[itemnum]);
526 switch (itemnum) {
527 case SI_STATUS:
528 stat_task->playing = strstr(line, "playing")? 1 : 0;
529 break;
530 case SI_FORMAT:
531 free(stat_task->af_status);
532 stat_task->af_status = para_strdup(line + ilen + 1);
533 break;
534 case SI_OFFSET:
535 stat_task->offset_seconds = atoi(line + ilen + 1);
536 break;
537 case SI_LENGTH:
538 stat_task->length_seconds = atoi(line + ilen + 1);
539 break;
540 case SI_STREAM_START:
541 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
542 stat_task->server_stream_start.tv_sec = sec;
543 stat_task->server_stream_start.tv_usec = usec;
544 }
545 break;
546 case SI_CURRENT_TIME:
547 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
548 struct timeval tv = {sec, usec};
549 compute_time_diff(&tv);
550 }
551 break;
552 }
553 }
554
555 static void handle_signal(int sig)
556 {
557 switch (sig) {
558 case SIGCHLD:
559 for (;;) {
560 pid_t pid = para_reap_child();
561 if (pid <= 0)
562 return;
563 PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
564 }
565 case SIGINT:
566 case SIGTERM:
567 case SIGHUP:
568 PARA_EMERG_LOG("terminating on signal %d\n", sig);
569 clean_exit(EXIT_FAILURE, "caught deadly signal");
570 return;
571 }
572 }
573
574 static void try_to_close_slot(int slot_num)
575 {
576 struct slot_info *s = &slot[slot_num];
577
578 if (s->format < 0)
579 return;
580 if (s->receiver_node && !s->receiver_node->eof)
581 return;
582 if (s->fc && !s->fc->eof)
583 return;
584 if (s->wng && !s->wng->eof)
585 return;
586 PARA_INFO_LOG("closing slot %d \n", slot_num);
587 wng_close(s->wng);
588 close_filters(s->fc);
589 free(s->fc);
590 close_receiver(slot_num);
591 clear_slot(slot_num);
592 }
593
594 /*
595 * Check if any receivers/filters/writers need to be started and do so if
596 * neccessary. Since the pre_select function didn't have a chance yet to put
597 * file descriptors into the fd sets given by s, make the upcoming select()
598 * return immediately to avoid a long timeout in case we started something.
599 */
600 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
601 {
602 int i;
603 struct timeval min_delay = {0, 1};
604
605 t->ret = 1;
606 if (audiod_status != AUDIOD_ON || !stat_task->playing)
607 return kill_all_decoders();
608 if (open_current_receiver(s))
609 s->timeout = min_delay;
610 FOR_EACH_SLOT(i) {
611 struct slot_info *sl = &slot[i];
612 struct audio_format_info *a;
613
614 if (sl->format < 0)
615 continue;
616 a = &afi[sl->format];
617 if (!sl->receiver_node)
618 continue;
619 if (!a->num_filters) {
620 if (sl->receiver_node->loaded && !sl->wng) {
621 open_writers(i);
622 s->timeout = min_delay;
623 }
624 continue;
625 }
626 if (sl->receiver_node->loaded && !sl->fc) {
627 open_filters(i);
628 s->timeout = min_delay;
629 continue;
630 }
631 if (sl->fc && *sl->fc->out_loaded && !sl->wng) {
632 open_writers(i);
633 s->timeout = min_delay;
634 }
635 }
636 }
637
638 static void audiod_post_select(__a_unused struct sched *s,
639 __a_unused struct task *t)
640 {
641 int i;
642
643 /* save away the current time for other users */
644 t->ret = 1;
645 FOR_EACH_SLOT(i)
646 try_to_close_slot(i);
647 }
648
649 static void init_audiod_task(struct task *t)
650 {
651 t->pre_select = audiod_pre_select;
652 t->post_select = audiod_post_select;
653 t->event_handler = NULL;
654 t->private_data = t;
655 sprintf(t->status, "audiod task");
656 }
657
658 static int parse_stream_command(const char *txt, char **cmd)
659 {
660 char *p = strchr(txt, ':');
661 int i;
662
663 if (!p)
664 return -E_MISSING_COLON;
665 p++;
666 FOR_EACH_AUDIO_FORMAT(i) {
667 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
668 continue;
669 *cmd = p;
670 return i;
671 }
672 return -E_UNSUPPORTED_AUDIO_FORMAT;
673 }
674
675 static int add_filter(int format, char *cmdline)
676 {
677 struct audio_format_info *a = &afi[format];
678 int filter_num, nf = a->num_filters;
679
680 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
681 if (filter_num < 0)
682 return filter_num;
683 a->filters[nf] = &filters[filter_num];
684 a->num_filters++;
685 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
686 a->filters[nf]->name);
687 return filter_num;
688 }
689
690 static int init_writers(void)
691 {
692 int i, ret, nw;
693 char *cmd;
694 struct audio_format_info *a;
695
696 init_supported_writers();
697 nw = PARA_MAX(1, conf.writer_given);
698 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
699 FOR_EACH_AUDIO_FORMAT(i) {
700 a = &afi[i];
701 a->writer_conf = para_malloc(nw * sizeof(void *));
702 a->writers = para_malloc(nw * sizeof(struct writer *));
703 a->num_writers = 0;
704 }
705 for (i = 0; i < conf.writer_given; i++) {
706 void *wconf;
707 int writer_num;
708 ret = parse_stream_command(conf.writer_arg[i], &cmd);
709 if (ret < 0)
710 goto out;
711 a = &afi[ret];
712 nw = a->num_writers;
713 wconf = check_writer_arg(cmd, &writer_num);
714 if (!wconf) {
715 ret = writer_num;
716 goto out;
717 }
718 a->writers[nw] = &writers[writer_num];
719 a->writer_conf[nw] = wconf;
720 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
721 nw, writer_names[writer_num]);
722 a->num_writers++;
723 }
724 ret = 1;
725 out:
726 return ret;
727 }
728
729 static int init_receivers(void)
730 {
731 int i, ret, receiver_num;
732 char *cmd = NULL;
733 struct audio_format_info *a;
734
735 for (i = 0; receivers[i].name; i++) {
736 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
737 receivers[i].init(&receivers[i]);
738 }
739 for (i = 0; i < conf.receiver_given; i++) {
740 char *arg = conf.receiver_arg[i];
741 char *recv = strchr(arg, ':');
742 ret = -E_MISSING_COLON;
743 if (!recv)
744 goto out;
745 *recv = '\0';
746 recv++;
747 ret = get_audio_format_num(arg);
748 if (ret < 0)
749 goto out;
750 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
751 if (!afi[ret].receiver_conf) {
752 ret = -E_RECV_SYNTAX;
753 goto out;
754 }
755 afi[ret].receiver = &receivers[receiver_num];
756 }
757 /* use the first available receiver with no arguments
758 * for those audio formats for which no receiver
759 * was specified
760 */
761 cmd = para_strdup(receivers[0].name);
762 FOR_EACH_AUDIO_FORMAT(i) {
763 a = &afi[i];
764 if (a->receiver_conf)
765 continue;
766 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
767 if (!a->receiver_conf)
768 return -E_RECV_SYNTAX;
769 a->receiver = &receivers[receiver_num];
770 }
771 ret = 1;
772 out:
773 free(cmd);
774 return ret;
775 }
776
777 static int init_default_filters(void)
778 {
779 int i, ret = 1;
780
781 FOR_EACH_AUDIO_FORMAT(i) {
782 struct audio_format_info *a = &afi[i];
783 char *tmp;
784 int j;
785
786 if (a->num_filters)
787 continue; /* no default -- nothing to to */
788 /* add "dec" to audio format name */
789 tmp = make_message("%sdec", audio_formats[i]);
790 for (j = 0; filters[j].name; j++)
791 if (!strcmp(tmp, filters[j].name))
792 break;
793 free(tmp);
794 ret = -E_UNSUPPORTED_FILTER;
795 if (!filters[j].name)
796 goto out;
797 tmp = para_strdup(filters[j].name);
798 ret = add_filter(i, tmp);
799 free(tmp);
800 if (ret < 0)
801 goto out;
802 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
803 filters[j].name);
804 }
805 out:
806 return ret;
807 }
808
809 static int init_filters(void)
810 {
811 int i, ret, nf;
812
813 filter_init(filters);
814 nf = PARA_MAX(1, conf.filter_given);
815 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
816 FOR_EACH_AUDIO_FORMAT(i) {
817 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
818 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
819 }
820 if (!conf.no_default_filters_given)
821 return init_default_filters();
822 for (i = 0; i < conf.filter_given; i++) {
823 char *arg = conf.filter_arg[i];
824 char *filter_name = strchr(arg, ':');
825 ret = -E_MISSING_COLON;
826 if (!filter_name)
827 goto out;
828 *filter_name = '\0';
829 filter_name++;
830 ret = get_audio_format_num(arg);
831 if (ret < 0)
832 goto out;
833 ret = add_filter(ret, filter_name);
834 if (ret < 0)
835 goto out;
836 }
837 ret = init_default_filters(); /* use default values for the rest */
838 out:
839 return ret;
840 }
841
842 static int init_stream_io(void)
843 {
844 int ret;
845
846 ret = init_writers();
847 if (ret < 0)
848 return ret;
849 ret = init_receivers();
850 if (ret < 0)
851 return ret;
852 ret = init_filters();
853 if (ret < 0)
854 return ret;
855 return 1;
856 }
857
858 static int audiod_get_socket(void)
859 {
860 struct sockaddr_un unix_addr;
861 int fd;
862
863 if (conf.socket_given)
864 socket_name = para_strdup(conf.socket_arg);
865 else {
866 char *hn = para_hostname();
867 socket_name = make_message("/var/paraslash/audiod_socket.%s",
868 hn);
869 free(hn);
870 }
871 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
872 if (conf.force_given)
873 unlink(socket_name);
874 fd = create_pf_socket(socket_name, &unix_addr,
875 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
876 if (fd < 0) {
877 PARA_EMERG_LOG("%s", "can not connect to socket\n");
878 exit(EXIT_FAILURE); /* do not unlink socket */
879 }
880 if (listen(fd , 5) < 0) {
881 PARA_EMERG_LOG("%s", "can not listen on socket\n");
882 exit(EXIT_FAILURE); /* do not unlink socket */
883 }
884 add_close_on_fork_list(fd);
885 return fd;
886 }
887
888 static int open_stat_pipe(void)
889 {
890 int ret, fd[3] = {-1, 1, 0};
891 pid_t pid;
892 ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
893 if (ret >= 0) {
894 ret = fd[1];
895 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
896 add_close_on_fork_list(ret);
897 } else
898 clean_exit(EXIT_FAILURE, "failed to open status pipe");
899 return ret;
900 }
901
902 void signal_event_handler(struct task *t)
903 {
904 struct signal_task *st = t->private_data;
905
906 if (t->ret != -E_SIGNAL_CAUGHT)
907 PARA_ERROR_LOG("%s (ignored)\n", PARA_STRERROR(-t->ret));
908 else
909 handle_signal(st->signum);
910 }
911
912 void signal_pre_select(struct sched *s, struct task *t)
913 {
914 struct signal_task *st = t->private_data;
915 t->ret = 1;
916 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
917 }
918
919 void signal_post_select(struct sched *s, struct task *t)
920 {
921 struct signal_task *st = t->private_data;
922 t->ret = 1;
923 if (!FD_ISSET(st->fd, &s->rfds))
924 return;
925 t->ret = -E_SIGNAL_CAUGHT;
926 st->signum = para_next_signal();
927 }
928
929 void signal_setup_default(struct signal_task *st)
930 {
931 st->task.pre_select = signal_pre_select;
932 st->task.post_select = signal_post_select;
933 st->task.private_data = st;
934 sprintf(st->task.status, "signal task");
935 }
936
937 static void command_pre_select(struct sched *s, struct task *t)
938 {
939 struct command_task *ct = t->private_data;
940 t->ret = 1;
941 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
942
943 }
944
945 static void command_post_select(struct sched *s, struct task *t)
946 {
947 int ret;
948 struct command_task *ct = t->private_data;
949
950 t->ret = 1; /* always successful */
951 if (audiod_status != AUDIOD_OFF)
952 audiod_status_dump();
953 if (!FD_ISSET(ct->fd, &s->rfds))
954 return;
955 ret = handle_connect(ct->fd);
956 if (ret < 0)
957 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
958 }
959
960 static void init_command_task(struct command_task *ct)
961 {
962 ct->task.pre_select = command_pre_select;
963 ct->task.post_select = command_post_select;
964 ct->task.event_handler = NULL;
965 ct->task.private_data = ct;
966 ct->fd = audiod_get_socket(); /* doesn't return on errors */
967 sprintf(ct->task.status, "command task");
968 }
969
970 static void status_event_handler(__a_unused struct task *t)
971 {
972 struct timeval delay = {1, 0};
973 int i;
974 struct status_task *st = t->private_data;
975
976 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-t->ret));
977 close_stat_pipe();
978 /* avoid busy loop if server is down */
979 tv_add(now, &delay, &st->restart_barrier);
980 FOR_EACH_AUDIO_FORMAT(i)
981 afi[i].restart_barrier = st->restart_barrier;
982 }
983
984 static void status_pre_select(struct sched *s, struct task *t)
985 {
986 struct status_task *st = t->private_data;
987 t->ret = 1;
988 if (st->fd >= 0 && audiod_status == AUDIOD_OFF)
989 close_stat_pipe();
990 if (st->fd < 0 && audiod_status != AUDIOD_OFF
991 && tv_diff(now, &st->restart_barrier, NULL) > 0) {
992 st->fd = open_stat_pipe();
993 st->loaded = 0;
994 st->buf[0] = '\0';
995 }
996 if (st->fd >= 0 && audiod_status != AUDIOD_OFF)
997 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
998 }
999
1000 static void status_post_select(struct sched *s, struct task *t)
1001 {
1002 struct status_task *st = t->private_data;
1003
1004 t->ret = 1;
1005 if (st->fd < 0 || !FD_ISSET(st->fd, &s->rfds))
1006 return;
1007 t->ret = read(st->fd, st->buf + st->loaded, STRINGSIZE - 1 - st->loaded);
1008 if (t->ret <= 0) {
1009 if (!t->ret)
1010 t->ret = -E_STATUS_EOF;
1011 return;
1012 }
1013 st->buf[t->ret + st->loaded] = '\0';
1014 st->loaded = for_each_line(st->buf, t->ret + st->loaded,
1015 &check_stat_line);
1016 }
1017
1018 static void init_status_task(struct status_task *st)
1019 {
1020 memset(st, 0, sizeof(struct status_task));
1021 st->task.pre_select = status_pre_select;
1022 st->task.post_select = status_post_select;
1023 st->task.event_handler = status_event_handler;
1024 st->task.private_data = st;
1025 st->fd = -1;
1026 st->sa_time_diff_sign = 1;
1027 sprintf(st->task.status, "status task");
1028 }
1029
1030 static void set_initial_status(void)
1031 {
1032 audiod_status = AUDIOD_ON;
1033 if (!conf.mode_given)
1034 return;
1035 if (!strcmp(conf.mode_arg, "sb")) {
1036 audiod_status = AUDIOD_STANDBY;
1037 return;
1038 }
1039 if (!strcmp(conf.mode_arg, "off")) {
1040 audiod_status = AUDIOD_OFF;
1041 return;
1042 }
1043 if (strcmp(conf.mode_arg, "on"))
1044 PARA_WARNING_LOG("%s", "invalid mode\n");
1045 }
1046
1047 int main(int argc, char *argv[])
1048 {
1049 char *cf;
1050 int ret, i;
1051 struct sched s;
1052 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1053 struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1054
1055 init_sched();
1056
1057 valid_fd_012();
1058 cmdline_parser(argc, argv, &conf);
1059 para_drop_privileges(conf.user_arg, conf.group_arg);
1060 cf = configfile_exists();
1061 if (cf) {
1062 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1063 PARA_EMERG_LOG("%s", "parse error in config file\n");
1064 exit(EXIT_FAILURE);
1065 }
1066 }
1067 if (conf.logfile_given)
1068 logfile = open_log(conf.logfile_arg);
1069 log_welcome("para_audiod", conf.loglevel_arg);
1070 i = init_stream_io();
1071 if (i < 0) {
1072 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1073 exit(EXIT_FAILURE);
1074 }
1075 server_uptime(UPTIME_SET);
1076 set_initial_status();
1077 FOR_EACH_SLOT(i)
1078 clear_slot(i);
1079 init_grabbing();
1080 setup_signal_handling();
1081 signal_setup_default(sig_task);
1082 sig_task->task.event_handler = signal_event_handler;
1083
1084 init_status_task(stat_task);
1085 init_command_task(cmd_task);
1086 init_audiod_task(audiod_task);
1087
1088 if (conf.daemon_given)
1089 daemon_init();
1090
1091 register_task(&sig_task->task);
1092 register_task(&cmd_task->task);
1093 register_task(&stat_task->task);
1094 register_task(audiod_task);
1095 s.default_timeout.tv_sec = 3;
1096 s.default_timeout.tv_usec = 99 * 1000;
1097 ret = sched(&s);
1098
1099 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1100 return EXIT_FAILURE;
1101 }