configure: Check for broken snprintf().
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2009 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 <regex.h>
9 #include <sys/types.h>
10 #include <dirent.h>
11 #include <signal.h>
12 #include <openssl/rc4.h>
13 #include <stdbool.h>
14
15 #include "para.h"
16 #include "error.h"
17 #include "crypt.h"
18 #include "audiod.cmdline.h"
19 #include "list.h"
20 #include "sched.h"
21 #include "ggo.h"
22 #include "recv.h"
23 #include "buffer_tree.h"
24 #include "filter.h"
25 #include "grab_client.h"
26 #include "client.cmdline.h"
27 #include "client.h"
28 #include "audiod.h"
29 #include "net.h"
30 #include "daemon.h"
31 #include "string.h"
32 #include "fd.h"
33 #include "write.h"
34 #include "write_common.h"
35 #include "signal.h"
36
37 /** define the array of error lists needed by para_audiod */
38 INIT_AUDIOD_ERRLISTS;
39 /** define the array containing all supported audio formats */
40 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
41
42 /** Defines how audiod handles one supported audio format. */
43 struct audio_format_info {
44 /** pointer to the receiver for this audio format */
45 struct receiver *receiver;
46 /** the receiver configuration */
47 void *receiver_conf;
48 /** the number of filters that should be activated for this audio format */
49 unsigned int num_filters;
50 /** Array of filter numbers to be activated. */
51 unsigned *filter_nums;
52 /** Pointer to the array of filter configurations. */
53 void **filter_conf;
54 /** the number of filters that should be activated for this audio format */
55 unsigned int num_writers;
56 /** Array of writer numbers to be activated. */
57 int *writer_nums;
58 /** pointer to the array of writer configurations */
59 void **writer_conf;
60 /** do not start receiver/filters/writer before this time */
61 struct timeval restart_barrier;
62 };
63
64 /**
65 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
66 * be associated with a receiver/filter/writer triple. This array holds all
67 * information on the status of these slots.
68 *
69 * \sa struct slot_info
70 * */
71 struct slot_info slot[MAX_STREAM_SLOTS];
72
73 /** The vss status flags audiod is interested in. */
74 enum vss_status_flags {
75 /** Whether the 'N' flag is set. */
76 VSS_STATUS_FLAG_NEXT = 1,
77 /** The 'P' flag is set. */
78 VSS_STATUS_FLAG_PLAYING = 2,
79 };
80
81 /**
82 * The task for obtaining para_server's status (para_client stat).
83 *
84 * \sa struct task, struct sched.
85 */
86 struct status_task {
87 /** The associated task structure of audiod. */
88 struct task task;
89 /** Client data associated with the stat task. */
90 struct client_task *ct;
91 /** Do not restart client command until this time. */
92 struct timeval restart_barrier;
93 /** Last time we received status data from para_server. */
94 struct timeval last_status_read;
95 /** The offset value announced by para_server. */
96 int offset_seconds;
97 /** The length of the current audio file as announced by para_server. */
98 int length_seconds;
99 /** The start of the current stream from the view of para_server. */
100 struct timeval server_stream_start;
101 /** The average time deviation between para_server and para_audiod. */
102 struct timeval sa_time_diff;
103 /** Whether client time is ahead of server time. */
104 int sa_time_diff_sign;
105 /** The 'P' and the 'N' flags as announced by para_server. */
106 enum vss_status_flags vss_status;
107 /** Number of times the clock difference is to be checked. */
108 unsigned clock_diff_count;
109 /** When to start the next check for clock difference. */
110 struct timeval clock_diff_barrier;
111 /** Number of the audio format as announced by para_server. */
112 int current_audio_format_num;
113 /* The status task btrn is the child of the client task. */
114 struct btr_node *btrn;
115 };
116
117 /** The array of status items sent by para_server. */
118 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
119
120 /**
121 * the current mode of operation of which can be changed by the on/off/cycle
122 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
123 */
124 int audiod_status = AUDIOD_ON;
125
126 /**
127 * the gengetopt args_info struct that holds information on all command line
128 * arguments
129 */
130 struct audiod_args_info conf;
131
132 static char *socket_name;
133 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
134
135 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
136
137 static struct status_task status_task_struct;
138
139 /**
140 * the task that calls the status command of para_server
141 *
142 * \sa struct status_task
143 */
144 static struct status_task *stat_task = &status_task_struct;
145 static struct timeval initial_delay_barrier;
146
147 /**
148 * the task for handling audiod commands
149 *
150 * \sa struct task, struct sched
151 */
152 struct command_task {
153 /** the local listening socket */
154 int fd;
155 /** the associated task structure */
156 struct task task;
157 };
158
159 /** iterate over all supported audio formats */
160 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
161
162 /**
163 * get the audio format number
164 * \param name the name of the audio format
165 *
166 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
167 * \a name is not a supported audio format.
168 */
169 int get_audio_format_num(const char *name)
170 {
171 int i;
172
173 while (para_isspace(*name))
174 name++;
175 FOR_EACH_AUDIO_FORMAT(i)
176 if (!strcmp(name, audio_formats[i]))
177 return i;
178 return -E_UNSUPPORTED_AUDIO_FORMAT;
179 }
180
181 char *get_time_string(int slot_num)
182 {
183 int ret, seconds = 0, length;
184 struct timeval *tmp, sum, sss, /* server stream start */
185 rstime, /* receiver start time */
186 wstime, /* writer start time */
187 wtime, /* now - writer start */
188 rskip; /* receiver start - sss */
189 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
190 char *msg;
191
192 if (audiod_status == AUDIOD_OFF)
193 goto empty;
194 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
195 if (stat_task->length_seconds) /* paused */
196 return NULL;
197 goto empty; /* stopped */
198 }
199 if (audiod_status == AUDIOD_ON && !s)
200 goto empty;
201 /*
202 * Valid status items and playing, set length and tmp to the stream
203 * start. We use the slot info and fall back to the info from current
204 * status items if no slot info is available.
205 */
206 length = stat_task->length_seconds;
207 tmp = &stat_task->server_stream_start;
208 if (s && s->wns) { /* writer active in this slot */
209 btr_get_node_start(s->wns[0].btrn, &wstime);
210 if (wstime.tv_sec != 0) { /* writer wrote something */
211 if (s->server_stream_start.tv_sec == 0) {
212 /* copy status info to slot */
213 s->server_stream_start = stat_task->server_stream_start;
214 s->offset_seconds = stat_task->offset_seconds;
215 s->seconds_total = stat_task->length_seconds;
216 }
217 length = s->seconds_total;
218 tmp = &s->server_stream_start;
219 }
220 }
221 if (stat_task->sa_time_diff_sign > 0)
222 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
223 else
224 tv_add(tmp, &stat_task->sa_time_diff, &sss);
225 if (!s || !s->wns) {
226 struct timeval diff;
227 tv_diff(now, &sss, &diff);
228 seconds = diff.tv_sec + stat_task->offset_seconds;
229 goto out;
230 }
231 tv_diff(now, &wstime, &wtime);
232 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
233 seconds = s->offset_seconds;
234 btr_get_node_start(s->receiver_node->btrn, &rstime);
235 ret = tv_diff(&rstime, &sss, &rskip);
236 if (ret > 0) { /* audiod was started in the middle of the stream */
237 tv_add(&wtime, &rskip, &sum);
238 seconds += sum.tv_sec;
239 } else
240 seconds += wtime.tv_sec;
241 out:
242 seconds = PARA_MIN(seconds, length);
243 seconds = PARA_MAX(seconds, 0);
244 msg = make_message(
245 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
246 s? "" : "~",
247 seconds / 60,
248 seconds % 60,
249 (length - seconds) / 60,
250 (length - seconds) % 60,
251 length? (seconds * 100 + length / 2) / length : 0,
252 length / 60,
253 length % 60
254 );
255 PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
256 return msg;
257 empty:
258 return para_strdup(NULL);
259 }
260
261 static int want_colors(void)
262 {
263 if (conf.color_arg == color_arg_no)
264 return 0;
265 if (conf.color_arg == color_arg_yes)
266 return 1;
267 if (conf.logfile_given)
268 return 0;
269 return isatty(STDERR_FILENO);
270 }
271
272 static void parse_config_or_die(void)
273 {
274 int ret;
275 char *config_file;
276 struct audiod_cmdline_parser_params params = {
277 .override = 0,
278 .initialize = 0,
279 .check_required = 1,
280 .check_ambiguity = 0,
281 .print_errors = 1
282 };
283
284 if (conf.config_file_given)
285 config_file = para_strdup(conf.config_file_arg);
286 else {
287 char *home = para_homedir();
288 config_file = make_message("%s/.paraslash/audiod.conf", home);
289 free(home);
290 }
291 ret = file_exists(config_file);
292 if (conf.config_file_given && !ret) {
293 PARA_EMERG_LOG("can not read config file %s\n", config_file);
294 goto err;
295 }
296 if (ret)
297 audiod_cmdline_parser_config_file(config_file, &conf, &params);
298 free(config_file);
299 daemon_set_loglevel(conf.loglevel_arg);
300 return;
301 err:
302 free(config_file);
303 exit(EXIT_FAILURE);
304 }
305
306 static void setup_signal_handling(void)
307 {
308 sig_task->fd = para_signal_init();
309 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
310 para_install_sighandler(SIGINT);
311 para_install_sighandler(SIGTERM);
312 para_install_sighandler(SIGHUP);
313 para_sigaction(SIGPIPE, SIG_IGN);
314 }
315
316 static void clear_slot(int slot_num)
317 {
318 struct slot_info *s = &slot[slot_num];
319
320 PARA_INFO_LOG("clearing slot %d\n", slot_num);
321 memset(s, 0, sizeof(struct slot_info));
322 s->format = -1;
323 }
324
325 static void close_receiver(int slot_num)
326 {
327 struct slot_info *s = &slot[slot_num];
328 struct audio_format_info *a;
329 struct timeval restart_delay = {0, 200 * 1000};
330
331 if (s->format < 0 || !s->receiver_node)
332 return;
333 a = &afi[s->format];
334 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
335 audio_formats[s->format], slot_num);
336 a->receiver->close(s->receiver_node);
337 btr_free_node(s->receiver_node->btrn);
338 free(s->receiver_node);
339 s->receiver_node = NULL;
340 tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
341 }
342
343 static void writer_cleanup(struct writer_node *wn)
344 {
345 struct writer *w;
346
347 if (!wn)
348 return;
349 w = writers + wn->writer_num;
350 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
351 w->close(wn);
352 btr_free_node(wn->btrn);
353 }
354
355 static void close_writers(struct slot_info *s)
356 {
357 struct audio_format_info *a;
358 int i;
359
360 if (s->format < 0)
361 return;
362 assert(s->wns);
363 a = afi + s->format;
364 if (a->num_writers == 0)
365 writer_cleanup(s->wns);
366 else {
367 for (i = 0; i < a->num_writers; i++)
368 writer_cleanup(s->wns + i);
369 }
370 free(s->wns);
371 s->wns = NULL;
372 }
373
374 static void close_filters(struct slot_info *s)
375 {
376 int i;
377 struct audio_format_info *a = afi + s->format;
378 if (a->num_filters == 0)
379 return;
380 for (i = 0; i < a->num_filters; i++) {
381 struct filter_node *fn = s->fns + i;
382 struct filter *f;
383
384 if (!fn)
385 continue;
386 f = filters + fn->filter_num;
387 if (f->close)
388 f->close(fn);
389 btr_free_node(fn->btrn);
390 }
391 free(s->fns);
392 s->fns = NULL;
393 }
394
395 /*
396 * Whenever a task commits suicide by returning from post_select with t->error
397 * < 0, it also removes its btr node. We do exactly that to kill a running
398 * task. Note that the scheduler checks t->error also _before_ each pre/post
399 * select call, so the victim will never be scheduled again.
400 */
401 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
402 {
403 if (t->error < 0)
404 return;
405 t->error = error;
406 btr_remove_node(btrn);
407 }
408
409 static void kill_all_decoders(int error)
410 {
411 int i, j;
412
413 FOR_EACH_SLOT(i) {
414 struct slot_info *s = &slot[i];
415 struct audio_format_info *a;
416 if (s->format < 0)
417 continue;
418 a = afi + s->format;
419 if (s->wns)
420 for (j = 0; j < a->num_writers; j++)
421 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
422 if (s->fns)
423 for (j = 0; j < a->num_writers; j++)
424 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
425 if (s->receiver_node)
426 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
427 error);
428 }
429 }
430
431 static int get_empty_slot(void)
432 {
433 int i;
434 struct slot_info *s;
435
436 FOR_EACH_SLOT(i) {
437 s = &slot[i];
438 if (s->format < 0) {
439 clear_slot(i);
440 return i;
441 }
442 if (s->wns || s->receiver_node || s->fns)
443 continue;
444 clear_slot(i);
445 return i;
446 }
447 return -E_NO_MORE_SLOTS;
448 }
449
450 /**
451 * get the number of filters
452 *
453 * \param audio_format_num the number identifying the audio format
454 *
455 * \return the number of filters for the given audio format
456 *
457 * \sa struct filter;
458 */
459 int num_filters(int audio_format_num)
460 {
461 return afi[audio_format_num].num_filters;
462 }
463
464 static void open_filters(struct slot_info *s)
465 {
466 struct audio_format_info *a = afi + s->format;
467 struct filter_node *fn;
468 int nf = a->num_filters;
469 struct btr_node *parent;
470 int i;
471
472 if (nf == 0)
473 return;
474 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
475 assert(s->fns == NULL);
476 s->fns = para_calloc(nf * sizeof(struct filter_node));
477 parent = s->receiver_node->btrn;
478 for (i = 0; i < nf; i++) {
479 struct filter *f = filters + a->filter_nums[i];
480 fn = s->fns + i;
481 fn->filter_num = a->filter_nums[i];
482 fn->conf = a->filter_conf[i];
483 fn->task.pre_select = f->pre_select;
484 fn->task.post_select = f->post_select;
485
486 fn->btrn = btr_new_node(&(struct btr_node_description)
487 EMBRACE(.name = f->name, .parent = parent,
488 .handler = f->execute, .context = fn));
489
490 f->open(fn);
491 register_task(&fn->task);
492 parent = fn->btrn;
493 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
494 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
495 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
496 }
497 }
498
499 static void open_writers(struct slot_info *s)
500 {
501 int i;
502 struct audio_format_info *a = afi + s->format;
503 struct writer_node *wn;
504 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
505
506 assert(s->wns == NULL);
507 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
508 * sizeof(struct writer_node));
509 if (a->num_writers == 0)
510 setup_writer_node(NULL, parent, s->wns);
511 else {
512 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
513 for (i = 0; i < a->num_writers; i++) {
514 wn = s->wns + i;
515 wn->conf = a->writer_conf[i];
516 wn->writer_num = a->writer_nums[i];
517 register_writer_node(wn, parent);
518 }
519 }
520 }
521
522 /* returns slot num on success */
523 static int open_receiver(int format)
524 {
525 struct audio_format_info *a = &afi[format];
526 struct slot_info *s;
527 int ret, slot_num;
528 struct receiver *r = a->receiver;
529 struct receiver_node *rn;
530 const struct timeval restart_delay = {2, 0};
531
532 ret = get_empty_slot();
533 if (ret < 0)
534 goto err;
535 slot_num = ret;
536 s = &slot[slot_num];
537 s->format = format;
538 s->receiver_node = para_calloc(sizeof(struct receiver_node));
539 rn = s->receiver_node;
540 rn->receiver = r;
541 rn->conf = a->receiver_conf;
542 rn->btrn = btr_new_node(&(struct btr_node_description)
543 EMBRACE(.name = r->name, .context = rn));
544 ret = r->open(rn);
545 if (ret < 0) {
546 btr_free_node(rn->btrn);
547 free(rn);
548 s->receiver_node = NULL;
549 goto err;
550 }
551 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
552 audio_formats[s->format], r->name, slot_num);
553 rn->task.pre_select = r->pre_select;
554 rn->task.post_select = r->post_select;
555 sprintf(rn->task.status, "%s receiver node", r->name);
556 register_task(&rn->task);
557 ret = slot_num;
558 err:
559 if (ret < 0)
560 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
561 tv_add(now, &restart_delay, &afi[format].restart_barrier);
562 return ret;
563 }
564
565 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
566 static int receiver_running(int format)
567 {
568 int i, ret = 0;
569
570 FOR_EACH_SLOT(i) {
571 struct slot_info *s = &slot[i];
572 if (s->format != format)
573 continue;
574 if (!s->receiver_node)
575 continue;
576 if (s->receiver_node->task.error >= 0)
577 return 1;
578 ret = -1;
579 }
580 return ret;
581 }
582
583 struct btr_node *audiod_get_btr_root(void)
584 {
585 int i, newest_slot = -1;
586 struct timeval newest_rstime = {0, 0};
587
588 FOR_EACH_SLOT(i) {
589 struct slot_info *s = &slot[i];
590 struct timeval rstime;
591 if (!s->receiver_node)
592 continue;
593 if (s->receiver_node->task.error < 0)
594 continue;
595 btr_get_node_start(s->receiver_node->btrn, &rstime);
596 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
597 continue;
598 newest_rstime = rstime;
599 newest_slot = i;
600 }
601 if (newest_slot == -1)
602 return NULL;
603 return slot[newest_slot].receiver_node->btrn;
604 }
605
606 /* whether a new instance of a decoder should be started. */
607 static bool must_start_decoder(void)
608 {
609 int ret, cafn = stat_task->current_audio_format_num;
610
611 if (cafn < 0 || !stat_task->ct)
612 return false;
613 /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
614 if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
615 return false;
616 ret = receiver_running(cafn);
617 if (ret != 0) /* already running */
618 return false;
619 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
620 return false;
621 return true;
622 }
623
624 static unsigned compute_time_diff(const struct timeval *status_time)
625 {
626 struct timeval tmp, diff;
627 static unsigned count;
628 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
629 const struct timeval max_deviation = {0, 500 * 1000};
630 const int time_smooth = 5;
631
632 if (!status_time)
633 return count;
634 sign = tv_diff(status_time, now, &diff);
635 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
636 // sign, sa_time_diff_sign);
637 if (!count) {
638 sa_time_diff_sign = sign;
639 stat_task->sa_time_diff = diff;
640 count++;
641 goto out;
642 }
643 if (count > 5) {
644 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
645 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
646 PARA_WARNING_LOG("time diff jump: %lims\n",
647 s * tv2ms(&tmp));
648 }
649 count++;
650 sa_time_diff_sign = tv_convex_combination(
651 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
652 count > 10? sign : sign * time_smooth, &diff,
653 &tmp);
654 stat_task->sa_time_diff = tmp;
655 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
656 sign < 0? "-" : "+",
657 tv2ms(&diff),
658 sa_time_diff_sign < 0? "-" : "+",
659 tv2ms(&stat_task->sa_time_diff)
660 );
661 out:
662 stat_task->sa_time_diff_sign = sa_time_diff_sign;
663 return count;
664 }
665
666 static int update_item(int itemnum, char *buf)
667 {
668 long unsigned sec, usec;
669
670 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
671 return 1;
672 free(stat_item_values[itemnum]);
673 stat_item_values[itemnum] = para_strdup(buf);
674 stat_client_write_item(itemnum);
675 switch (itemnum) {
676 case SI_STATUS_FLAGS:
677 stat_task->vss_status = 0;
678 if (strchr(buf, 'N'))
679 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
680 if (strchr(buf, 'P'))
681 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
682 break;
683 case SI_OFFSET:
684 stat_task->offset_seconds = atoi(buf);
685 break;
686 case SI_SECONDS_TOTAL:
687 stat_task->length_seconds = atoi(buf);
688 break;
689 case SI_STREAM_START:
690 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
691 struct timeval a_start, delay;
692 delay.tv_sec = conf.stream_delay_arg / 1000;
693 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
694 stat_task->server_stream_start.tv_sec = sec;
695 stat_task->server_stream_start.tv_usec = usec;
696 if (compute_time_diff(NULL) > 2) {
697 if (stat_task->sa_time_diff_sign < 0)
698 tv_add(&stat_task->server_stream_start,
699 &stat_task->sa_time_diff, &a_start);
700 else
701 tv_diff(&stat_task->server_stream_start,
702 &stat_task->sa_time_diff, &a_start);
703 tv_add(&a_start, &delay, &initial_delay_barrier);
704 }
705 }
706 break;
707 case SI_CURRENT_TIME:
708 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
709 struct timeval tv = {sec, usec};
710 compute_time_diff(&tv);
711 }
712 break;
713 case SI_FORMAT:
714 stat_task->current_audio_format_num
715 = get_audio_format_num(buf);
716 }
717 return 1;
718 }
719
720 static int parse_stream_command(const char *txt, char **cmd)
721 {
722 char *p = strchr(txt, ':');
723 int i;
724
725 if (!p)
726 return -E_MISSING_COLON;
727 p++;
728 FOR_EACH_AUDIO_FORMAT(i) {
729 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
730 continue;
731 *cmd = p;
732 return i;
733 }
734 return -E_UNSUPPORTED_AUDIO_FORMAT;
735 }
736
737 static int add_filter(int format, char *cmdline)
738 {
739 struct audio_format_info *a = &afi[format];
740 int filter_num, nf = a->num_filters;
741
742 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
743 if (filter_num < 0)
744 return filter_num;
745 a->filter_nums[nf] = filter_num;
746 a->num_filters++;
747 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
748 filters[filter_num].name);
749 return filter_num;
750 }
751
752 static int parse_writer_args(void)
753 {
754 int i, ret, nw;
755 char *cmd;
756 struct audio_format_info *a;
757
758 nw = PARA_MAX(1U, conf.writer_given);
759 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
760 FOR_EACH_AUDIO_FORMAT(i) {
761 a = &afi[i];
762 a->writer_conf = para_malloc(nw * sizeof(void *));
763 a->writer_nums = para_malloc(nw * sizeof(int));
764 a->num_writers = 0;
765 }
766 for (i = 0; i < conf.writer_given; i++) {
767 void *wconf;
768 int writer_num;
769 ret = parse_stream_command(conf.writer_arg[i], &cmd);
770 if (ret < 0)
771 goto out;
772 a = &afi[ret];
773 nw = a->num_writers;
774 wconf = check_writer_arg(cmd, &writer_num);
775 if (!wconf) {
776 ret = writer_num;
777 goto out;
778 }
779 a->writer_nums[nw] = writer_num;
780 a->writer_conf[nw] = wconf;
781 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
782 nw, writer_names[writer_num]);
783 a->num_writers++;
784 }
785 ret = 1;
786 out:
787 return ret;
788 }
789
790 static int parse_receiver_args(void)
791 {
792 int i, ret, receiver_num;
793 char *cmd = NULL;
794 struct audio_format_info *a;
795
796 for (i = conf.receiver_given - 1; i >= 0; i--) {
797 char *arg = conf.receiver_arg[i];
798 char *recv_arg = strchr(arg, ':');
799 ret = -E_MISSING_COLON;
800 if (!recv_arg)
801 goto out;
802 *recv_arg = '\0';
803 recv_arg++;
804 ret = get_audio_format_num(arg);
805 if (ret < 0)
806 goto out;
807 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
808 if (!afi[ret].receiver_conf) {
809 ret = -E_RECV_SYNTAX;
810 goto out;
811 }
812 afi[ret].receiver = &receivers[receiver_num];
813 }
814 /* use the first available receiver with no arguments
815 * for those audio formats for which no receiver
816 * was specified
817 */
818 cmd = para_strdup(receivers[0].name);
819 FOR_EACH_AUDIO_FORMAT(i) {
820 a = &afi[i];
821 if (a->receiver_conf)
822 continue;
823 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
824 if (!a->receiver_conf)
825 return -E_RECV_SYNTAX;
826 a->receiver = &receivers[receiver_num];
827 }
828 ret = 1;
829 out:
830 free(cmd);
831 return ret;
832 }
833
834 static int init_default_filters(void)
835 {
836 int i, ret = 1;
837
838 FOR_EACH_AUDIO_FORMAT(i) {
839 struct audio_format_info *a = &afi[i];
840 char *tmp;
841 int j;
842
843 if (a->num_filters)
844 continue; /* no default -- nothing to to */
845 /* add "dec" to audio format name */
846 tmp = make_message("%sdec", audio_formats[i]);
847 for (j = 0; filters[j].name; j++)
848 if (!strcmp(tmp, filters[j].name))
849 break;
850 free(tmp);
851 ret = -E_UNSUPPORTED_FILTER;
852 if (!filters[j].name)
853 goto out;
854 tmp = para_strdup(filters[j].name);
855 ret = add_filter(i, tmp);
856 free(tmp);
857 if (ret < 0)
858 goto out;
859 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
860 filters[j].name);
861 }
862 out:
863 return ret;
864 }
865
866 static int parse_filter_args(void)
867 {
868 int i, ret, nf;
869
870 nf = PARA_MAX(1U, conf.filter_given);
871 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
872 FOR_EACH_AUDIO_FORMAT(i) {
873 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
874 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
875 }
876 if (!conf.no_default_filters_given)
877 return init_default_filters();
878 for (i = 0; i < conf.filter_given; i++) {
879 char *arg = conf.filter_arg[i];
880 char *filter_name = strchr(arg, ':');
881 ret = -E_MISSING_COLON;
882 if (!filter_name)
883 goto out;
884 *filter_name = '\0';
885 filter_name++;
886 ret = get_audio_format_num(arg);
887 if (ret < 0)
888 goto out;
889 ret = add_filter(ret, filter_name);
890 if (ret < 0)
891 goto out;
892 }
893 ret = init_default_filters(); /* use default values for the rest */
894 out:
895 return ret;
896 }
897
898 static int parse_stream_args(void)
899 {
900 int ret;
901
902 ret = parse_receiver_args();
903 if (ret < 0)
904 return ret;
905 ret = parse_filter_args();
906 if (ret < 0)
907 return ret;
908 ret = parse_writer_args();
909 if (ret < 0)
910 return ret;
911 return 1;
912 }
913
914 /* does not unlink socket on errors */
915 static int audiod_get_socket(void)
916 {
917 struct sockaddr_un unix_addr;
918 int ret, fd;
919
920 if (conf.socket_given)
921 socket_name = para_strdup(conf.socket_arg);
922 else {
923 char *hn = para_hostname();
924 socket_name = make_message("/var/paraslash/audiod_socket.%s",
925 hn);
926 free(hn);
927 }
928 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
929 if (conf.force_given)
930 unlink(socket_name);
931 ret = create_local_socket(socket_name, &unix_addr,
932 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
933 if (ret < 0)
934 goto err;
935 fd = ret;
936 if (listen(fd , 5) < 0) {
937 ret = -ERRNO_TO_PARA_ERROR(errno);
938 goto err;
939 }
940 ret = mark_fd_nonblocking(fd);
941 if (ret < 0)
942 goto err;
943 return fd;
944 err:
945 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
946 exit(EXIT_FAILURE);
947 }
948
949 static void signal_pre_select(struct sched *s, struct task *t)
950 {
951 struct signal_task *st = container_of(t, struct signal_task, task);
952 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
953 }
954
955 static void signal_post_select(struct sched *s, struct task *t)
956 {
957 struct signal_task *st = container_of(t, struct signal_task, task);
958
959 if (!FD_ISSET(st->fd, &s->rfds))
960 return;
961
962 st->signum = para_next_signal();
963 switch (st->signum) {
964 case SIGINT:
965 case SIGTERM:
966 case SIGHUP:
967 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
968 clean_exit(EXIT_FAILURE, "caught deadly signal");
969 }
970 }
971
972 static void signal_setup_default(struct signal_task *st)
973 {
974 st->task.pre_select = signal_pre_select;
975 st->task.post_select = signal_post_select;
976 sprintf(st->task.status, "signal task");
977 }
978
979 static void command_pre_select(struct sched *s, struct task *t)
980 {
981 struct command_task *ct = container_of(t, struct command_task, task);
982 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
983 }
984
985 static void command_post_select(struct sched *s, struct task *t)
986 {
987 int ret;
988 struct command_task *ct = container_of(t, struct command_task, task);
989 static struct timeval last_status_dump;
990 struct timeval tmp, delay = {0, 500 * 1000};
991
992 tv_add(&last_status_dump, &delay, &tmp);
993 if (tv_diff(&tmp, now, NULL) < 0) {
994 audiod_status_dump();
995 last_status_dump = *now;
996 }
997
998 if (!FD_ISSET(ct->fd, &s->rfds))
999 return;
1000 ret = handle_connect(ct->fd);
1001 if (ret < 0)
1002 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1003 }
1004
1005 static void init_command_task(struct command_task *ct)
1006 {
1007 ct->task.pre_select = command_pre_select;
1008 ct->task.post_select = command_post_select;
1009 ct->task.error = 0;
1010 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1011 sprintf(ct->task.status, "command task");
1012 }
1013
1014 static void close_stat_pipe(void)
1015 {
1016 if (!stat_task->ct)
1017 return;
1018 btr_free_node(stat_task->ct->btrn);
1019 client_close(stat_task->ct);
1020 stat_task->ct = NULL;
1021 clear_and_dump_items();
1022 stat_task->length_seconds = 0;
1023 stat_task->offset_seconds = 0;
1024 stat_task->vss_status = 0;
1025 stat_task->current_audio_format_num = -1;
1026 audiod_status_dump();
1027 }
1028
1029 /**
1030 * close the connection to para_server and exit
1031 *
1032 * \param status the exit status which is passed to exit(3)
1033 * \param msg the log message
1034 *
1035 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1036 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1037 * EXIT_FAILURE.
1038 *
1039 * \sa exit(3)
1040 */
1041 void __noreturn clean_exit(int status, const char *msg)
1042 {
1043 PARA_EMERG_LOG("%s\n", msg);
1044 if (socket_name)
1045 unlink(socket_name);
1046 close_stat_pipe();
1047 exit(status);
1048 }
1049
1050 /* avoid busy loop if server is down */
1051 static void set_stat_task_restart_barrier(unsigned seconds)
1052 {
1053 struct timeval delay = {seconds, 0};
1054 tv_add(now, &delay, &stat_task->restart_barrier);
1055 }
1056
1057 static void try_to_close_slot(int slot_num)
1058 {
1059 struct slot_info *s = &slot[slot_num];
1060 struct audio_format_info *a = afi + s->format;
1061 int i;
1062
1063 if (s->format < 0)
1064 return;
1065 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1066 return;
1067 for (i = 0; i < a->num_filters; i++)
1068 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1069 return;
1070 if (a->num_writers > 0) {
1071 for (i = 0; i < a->num_writers; i++)
1072 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1073 return;
1074 } else {
1075 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1076 return;
1077 }
1078 PARA_INFO_LOG("closing slot %d\n", slot_num);
1079 close_writers(s);
1080 close_filters(s);
1081 close_receiver(slot_num);
1082 clear_slot(slot_num);
1083 }
1084
1085 /*
1086 * Check if any receivers/filters/writers need to be started and do so if
1087 * necessary.
1088 */
1089 static void start_stop_decoders(void)
1090 {
1091 int i, ret;
1092 struct slot_info *sl;
1093 struct audio_format_info *a;
1094
1095 FOR_EACH_SLOT(i)
1096 try_to_close_slot(i);
1097 if (audiod_status != AUDIOD_ON ||
1098 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1099 return kill_all_decoders(-E_NOT_PLAYING);
1100 if (!must_start_decoder())
1101 return;
1102 ret = open_receiver(stat_task->current_audio_format_num);
1103 if (ret < 0)
1104 return;
1105 sl = slot + ret;
1106 a = afi + sl->format;
1107 if (a->num_filters)
1108 open_filters(sl);
1109 open_writers(sl);
1110 activate_grab_clients();
1111 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1112 }
1113
1114 static void status_pre_select(struct sched *s, struct task *t)
1115 {
1116 struct status_task *st = container_of(t, struct status_task, task);
1117 int ret, cafn = stat_task->current_audio_format_num;
1118
1119 if (must_start_decoder())
1120 goto min_delay;
1121 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1122 if (ret > 0)
1123 goto min_delay;
1124 if (!st->ct)
1125 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1126 if (cafn >= 0)
1127 sched_request_barrier(&afi[cafn].restart_barrier, s);
1128 return;
1129 min_delay:
1130 sched_min_delay(s);
1131 }
1132
1133 /* restart the client task if necessary */
1134 static void status_post_select(__a_unused struct sched *s, struct task *t)
1135 {
1136 struct status_task *st = container_of(t, struct status_task, task);
1137
1138 if (audiod_status == AUDIOD_OFF) {
1139 if (!st->ct)
1140 goto out;
1141 if (st->ct->task.error >= 0) {
1142 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1143 goto out;
1144 }
1145 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1146 goto out;
1147 close_stat_pipe();
1148 st->clock_diff_count = conf.clock_diff_count_arg;
1149 goto out;
1150 }
1151 if (st->ct) {
1152 char *buf;
1153 size_t sz;
1154 int ret;
1155 if (st->ct->task.error < 0) {
1156 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1157 goto out;
1158 close_stat_pipe();
1159 goto out;
1160 }
1161 if (st->ct->status != CL_RECEIVING)
1162 goto out;
1163 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1164 if (ret <= 0)
1165 goto out;
1166 sz = btr_next_buffer(st->btrn, &buf);
1167 ret = for_each_stat_item(buf, sz, update_item);
1168 if (ret < 0) {
1169 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1170 goto out;
1171 }
1172 if (sz != ret)
1173 st->last_status_read = *now;
1174 else {
1175 struct timeval diff;
1176 tv_diff(now, &st->last_status_read, &diff);
1177 if (diff.tv_sec > 61)
1178 kill_btrn(st->ct->btrn, &st->ct->task,
1179 -E_STATUS_TIMEOUT);
1180 }
1181 btr_consume(st->btrn, sz - ret);
1182 goto out;
1183 }
1184 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1185 goto out;
1186 if (st->clock_diff_count) { /* get status only one time */
1187 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1188 int argc = 5;
1189 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1190 st->clock_diff_count--;
1191 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1192 set_stat_task_restart_barrier(2);
1193
1194 } else {
1195 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1196 int argc = 4;
1197 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1198 set_stat_task_restart_barrier(5);
1199 }
1200 free(stat_item_values[SI_BASENAME]);
1201 stat_item_values[SI_BASENAME] = para_strdup(
1202 "no connection to para_server");
1203 stat_client_write_item(SI_BASENAME);
1204 st->last_status_read = *now;
1205 out:
1206 start_stop_decoders();
1207 }
1208
1209 static void init_status_task(struct status_task *st)
1210 {
1211 memset(st, 0, sizeof(struct status_task));
1212 st->task.pre_select = status_pre_select;
1213 st->task.post_select = status_post_select;
1214 st->sa_time_diff_sign = 1;
1215 st->clock_diff_count = conf.clock_diff_count_arg;
1216 st->current_audio_format_num = -1;
1217 sprintf(st->task.status, "stat");
1218 st->btrn = btr_new_node(&(struct btr_node_description)
1219 EMBRACE(.name = "stat"));
1220 }
1221
1222 static void set_initial_status(void)
1223 {
1224 audiod_status = AUDIOD_ON;
1225 if (!conf.mode_given)
1226 return;
1227 if (!strcmp(conf.mode_arg, "sb")) {
1228 audiod_status = AUDIOD_STANDBY;
1229 return;
1230 }
1231 if (!strcmp(conf.mode_arg, "off")) {
1232 audiod_status = AUDIOD_OFF;
1233 return;
1234 }
1235 if (strcmp(conf.mode_arg, "on"))
1236 PARA_WARNING_LOG("invalid mode\n");
1237 }
1238
1239 __noreturn static void print_help_and_die(void)
1240 {
1241 int d = conf.detailed_help_given;
1242 const char **p = d? audiod_args_info_detailed_help
1243 : audiod_args_info_help;
1244
1245 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1246 AUDIOD_CMDLINE_PARSER_VERSION);
1247 printf_or_die("%s\n\n", audiod_args_info_usage);
1248 for (; *p; p++)
1249 printf_or_die("%s\n", *p);
1250 print_receiver_helps(d);
1251 print_filter_helps(d);
1252 print_writer_helps(d);
1253 exit(0);
1254 }
1255
1256 static void init_colors_or_die(void)
1257 {
1258 int ret, i;
1259
1260 if (!want_colors())
1261 return;
1262 daemon_set_default_log_colors();
1263 daemon_set_flag(DF_COLOR_LOG);
1264 for (i = 0; i < conf.log_color_given; i++) {
1265 ret = daemon_set_log_color(conf.log_color_arg[i]);
1266 if (ret < 0)
1267 exit(EXIT_FAILURE);
1268 }
1269 }
1270
1271 /**
1272 * the main function of para_audiod
1273 *
1274 * \param argc usual argument count
1275 * \param argv usual argument vector
1276 *
1277 * \return EXIT_SUCCESS or EXIT_FAILURE
1278 *
1279 * \sa para_audiod(1)
1280 * */
1281 int main(int argc, char *argv[])
1282 {
1283 int ret, i;
1284 static struct sched s;
1285 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1286 struct audiod_cmdline_parser_params params = {
1287 .override = 0,
1288 .initialize = 1,
1289 .check_required = 0,
1290 .check_ambiguity = 0,
1291 .print_errors = 1
1292 };
1293
1294 valid_fd_012();
1295 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1296 exit(EXIT_FAILURE);
1297 HANDLE_VERSION_FLAG("audiod", conf);
1298 /* init receivers/filters/writers early to make help work */
1299 recv_init();
1300 filter_init();
1301 writer_init();
1302 if (conf.help_given || conf.detailed_help_given)
1303 print_help_and_die();
1304 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1305 parse_config_or_die();
1306 init_colors_or_die();
1307 init_random_seed_or_die();
1308 daemon_set_flag(DF_LOG_TIME);
1309 daemon_set_flag(DF_LOG_HOSTNAME);
1310 daemon_set_flag(DF_LOG_LL);
1311 if (conf.log_timing_given)
1312 daemon_set_flag(DF_LOG_TIMING);
1313 if (conf.logfile_given) {
1314 daemon_set_logfile(conf.logfile_arg);
1315 daemon_open_log_or_die();
1316 }
1317 ret = parse_stream_args();
1318 if (ret < 0) {
1319 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1320 exit(EXIT_FAILURE);
1321 }
1322 log_welcome("para_audiod");
1323 server_uptime(UPTIME_SET);
1324 set_initial_status();
1325 FOR_EACH_SLOT(i)
1326 clear_slot(i);
1327 setup_signal_handling();
1328 signal_setup_default(sig_task);
1329
1330 init_status_task(stat_task);
1331 init_command_task(cmd_task);
1332
1333 if (conf.daemon_given)
1334 daemonize();
1335
1336 register_task(&sig_task->task);
1337 register_task(&cmd_task->task);
1338 register_task(&stat_task->task);
1339 s.default_timeout.tv_sec = 2;
1340 s.default_timeout.tv_usec = 999 * 1000;
1341 ret = schedule(&s);
1342
1343 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1344 return EXIT_FAILURE;
1345 }