[btr] Only print debug message if we're really increasing the wrap buffer.
[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, s - slot);
495 sprintf(fn->task.status, "%s (slot %d)", f->name, 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 /* returns slot num on success. */
607 static int open_current_receiver(void)
608 {
609 int ret, cafn = stat_task->current_audio_format_num;
610
611 if (cafn < 0 || !stat_task->ct)
612 return -1;
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 -1;
616 ret = receiver_running(cafn);
617 if (ret != 0) /* already running */
618 return -1;
619 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
620 return -1;
621 /* start a new receiver */
622 return open_receiver(cafn);
623 }
624
625 static unsigned compute_time_diff(const struct timeval *status_time)
626 {
627 struct timeval tmp, diff;
628 static unsigned count;
629 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
630 const struct timeval max_deviation = {0, 500 * 1000};
631 const int time_smooth = 5;
632
633 if (!status_time)
634 return count;
635 sign = tv_diff(status_time, now, &diff);
636 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
637 // sign, sa_time_diff_sign);
638 if (!count) {
639 sa_time_diff_sign = sign;
640 stat_task->sa_time_diff = diff;
641 count++;
642 goto out;
643 }
644 if (count > 5) {
645 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
646 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
647 PARA_WARNING_LOG("time diff jump: %lims\n",
648 s * tv2ms(&tmp));
649 }
650 count++;
651 sa_time_diff_sign = tv_convex_combination(
652 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
653 count > 10? sign : sign * time_smooth, &diff,
654 &tmp);
655 stat_task->sa_time_diff = tmp;
656 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
657 sign > 0? "+" : "-",
658 tv2ms(&diff),
659 sa_time_diff_sign ? "+" : "-",
660 tv2ms(&stat_task->sa_time_diff)
661 );
662 out:
663 stat_task->sa_time_diff_sign = sa_time_diff_sign;
664 return count;
665 }
666
667 static int update_item(int itemnum, char *buf)
668 {
669 long unsigned sec, usec;
670
671 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
672 return 1;
673 free(stat_item_values[itemnum]);
674 stat_item_values[itemnum] = para_strdup(buf);
675 stat_client_write_item(itemnum);
676 switch (itemnum) {
677 case SI_STATUS_FLAGS:
678 stat_task->vss_status = 0;
679 if (strchr(buf, 'N'))
680 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
681 if (strchr(buf, 'P'))
682 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
683 break;
684 case SI_OFFSET:
685 stat_task->offset_seconds = atoi(buf);
686 break;
687 case SI_SECONDS_TOTAL:
688 stat_task->length_seconds = atoi(buf);
689 break;
690 case SI_STREAM_START:
691 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
692 struct timeval a_start, delay;
693 delay.tv_sec = conf.stream_delay_arg / 1000;
694 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
695 stat_task->server_stream_start.tv_sec = sec;
696 stat_task->server_stream_start.tv_usec = usec;
697 if (compute_time_diff(NULL) > 2) {
698 if (stat_task->sa_time_diff_sign < 0)
699 tv_add(&stat_task->server_stream_start,
700 &stat_task->sa_time_diff, &a_start);
701 else
702 tv_diff(&stat_task->server_stream_start,
703 &stat_task->sa_time_diff, &a_start);
704 tv_add(&a_start, &delay, &initial_delay_barrier);
705 }
706 }
707 break;
708 case SI_CURRENT_TIME:
709 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
710 struct timeval tv = {sec, usec};
711 compute_time_diff(&tv);
712 }
713 break;
714 case SI_FORMAT:
715 stat_task->current_audio_format_num
716 = get_audio_format_num(buf);
717 }
718 return 1;
719 }
720
721 static int parse_stream_command(const char *txt, char **cmd)
722 {
723 char *p = strchr(txt, ':');
724 int i;
725
726 if (!p)
727 return -E_MISSING_COLON;
728 p++;
729 FOR_EACH_AUDIO_FORMAT(i) {
730 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
731 continue;
732 *cmd = p;
733 return i;
734 }
735 return -E_UNSUPPORTED_AUDIO_FORMAT;
736 }
737
738 static int add_filter(int format, char *cmdline)
739 {
740 struct audio_format_info *a = &afi[format];
741 int filter_num, nf = a->num_filters;
742
743 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
744 if (filter_num < 0)
745 return filter_num;
746 a->filter_nums[nf] = filter_num;
747 a->num_filters++;
748 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
749 filters[filter_num].name);
750 return filter_num;
751 }
752
753 static int parse_writer_args(void)
754 {
755 int i, ret, nw;
756 char *cmd;
757 struct audio_format_info *a;
758
759 nw = PARA_MAX(1U, conf.writer_given);
760 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
761 FOR_EACH_AUDIO_FORMAT(i) {
762 a = &afi[i];
763 a->writer_conf = para_malloc(nw * sizeof(void *));
764 a->writer_nums = para_malloc(nw * sizeof(int));
765 a->num_writers = 0;
766 }
767 for (i = 0; i < conf.writer_given; i++) {
768 void *wconf;
769 int writer_num;
770 ret = parse_stream_command(conf.writer_arg[i], &cmd);
771 if (ret < 0)
772 goto out;
773 a = &afi[ret];
774 nw = a->num_writers;
775 wconf = check_writer_arg(cmd, &writer_num);
776 if (!wconf) {
777 ret = writer_num;
778 goto out;
779 }
780 a->writer_nums[nw] = writer_num;
781 a->writer_conf[nw] = wconf;
782 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
783 nw, writer_names[writer_num]);
784 a->num_writers++;
785 }
786 ret = 1;
787 out:
788 return ret;
789 }
790
791 static int parse_receiver_args(void)
792 {
793 int i, ret, receiver_num;
794 char *cmd = NULL;
795 struct audio_format_info *a;
796
797 for (i = conf.receiver_given - 1; i >= 0; i--) {
798 char *arg = conf.receiver_arg[i];
799 char *recv_arg = strchr(arg, ':');
800 ret = -E_MISSING_COLON;
801 if (!recv_arg)
802 goto out;
803 *recv_arg = '\0';
804 recv_arg++;
805 ret = get_audio_format_num(arg);
806 if (ret < 0)
807 goto out;
808 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
809 if (!afi[ret].receiver_conf) {
810 ret = -E_RECV_SYNTAX;
811 goto out;
812 }
813 afi[ret].receiver = &receivers[receiver_num];
814 }
815 /* use the first available receiver with no arguments
816 * for those audio formats for which no receiver
817 * was specified
818 */
819 cmd = para_strdup(receivers[0].name);
820 FOR_EACH_AUDIO_FORMAT(i) {
821 a = &afi[i];
822 if (a->receiver_conf)
823 continue;
824 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
825 if (!a->receiver_conf)
826 return -E_RECV_SYNTAX;
827 a->receiver = &receivers[receiver_num];
828 }
829 ret = 1;
830 out:
831 free(cmd);
832 return ret;
833 }
834
835 static int init_default_filters(void)
836 {
837 int i, ret = 1;
838
839 FOR_EACH_AUDIO_FORMAT(i) {
840 struct audio_format_info *a = &afi[i];
841 char *tmp;
842 int j;
843
844 if (a->num_filters)
845 continue; /* no default -- nothing to to */
846 /* add "dec" to audio format name */
847 tmp = make_message("%sdec", audio_formats[i]);
848 for (j = 0; filters[j].name; j++)
849 if (!strcmp(tmp, filters[j].name))
850 break;
851 free(tmp);
852 ret = -E_UNSUPPORTED_FILTER;
853 if (!filters[j].name)
854 goto out;
855 tmp = para_strdup(filters[j].name);
856 ret = add_filter(i, tmp);
857 free(tmp);
858 if (ret < 0)
859 goto out;
860 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
861 filters[j].name);
862 }
863 out:
864 return ret;
865 }
866
867 static int parse_filter_args(void)
868 {
869 int i, ret, nf;
870
871 nf = PARA_MAX(1U, conf.filter_given);
872 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
873 FOR_EACH_AUDIO_FORMAT(i) {
874 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
875 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
876 }
877 if (!conf.no_default_filters_given)
878 return init_default_filters();
879 for (i = 0; i < conf.filter_given; i++) {
880 char *arg = conf.filter_arg[i];
881 char *filter_name = strchr(arg, ':');
882 ret = -E_MISSING_COLON;
883 if (!filter_name)
884 goto out;
885 *filter_name = '\0';
886 filter_name++;
887 ret = get_audio_format_num(arg);
888 if (ret < 0)
889 goto out;
890 ret = add_filter(ret, filter_name);
891 if (ret < 0)
892 goto out;
893 }
894 ret = init_default_filters(); /* use default values for the rest */
895 out:
896 return ret;
897 }
898
899 static int parse_stream_args(void)
900 {
901 int ret;
902
903 ret = parse_receiver_args();
904 if (ret < 0)
905 return ret;
906 ret = parse_filter_args();
907 if (ret < 0)
908 return ret;
909 ret = parse_writer_args();
910 if (ret < 0)
911 return ret;
912 return 1;
913 }
914
915 /* does not unlink socket on errors */
916 static int audiod_get_socket(void)
917 {
918 struct sockaddr_un unix_addr;
919 int ret, fd;
920
921 if (conf.socket_given)
922 socket_name = para_strdup(conf.socket_arg);
923 else {
924 char *hn = para_hostname();
925 socket_name = make_message("/var/paraslash/audiod_socket.%s",
926 hn);
927 free(hn);
928 }
929 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
930 if (conf.force_given)
931 unlink(socket_name);
932 ret = create_local_socket(socket_name, &unix_addr,
933 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
934 if (ret < 0)
935 goto err;
936 fd = ret;
937 if (listen(fd , 5) < 0) {
938 ret = -ERRNO_TO_PARA_ERROR(errno);
939 goto err;
940 }
941 ret = mark_fd_nonblocking(fd);
942 if (ret < 0)
943 goto err;
944 return fd;
945 err:
946 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
947 exit(EXIT_FAILURE);
948 }
949
950 static void signal_pre_select(struct sched *s, struct task *t)
951 {
952 struct signal_task *st = container_of(t, struct signal_task, task);
953 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
954 }
955
956 static void signal_post_select(struct sched *s, struct task *t)
957 {
958 struct signal_task *st = container_of(t, struct signal_task, task);
959
960 if (!FD_ISSET(st->fd, &s->rfds))
961 return;
962
963 st->signum = para_next_signal();
964 switch (st->signum) {
965 case SIGINT:
966 case SIGTERM:
967 case SIGHUP:
968 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
969 clean_exit(EXIT_FAILURE, "caught deadly signal");
970 }
971 }
972
973 static void signal_setup_default(struct signal_task *st)
974 {
975 st->task.pre_select = signal_pre_select;
976 st->task.post_select = signal_post_select;
977 sprintf(st->task.status, "signal task");
978 }
979
980 static void command_pre_select(struct sched *s, struct task *t)
981 {
982 struct command_task *ct = container_of(t, struct command_task, task);
983 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
984 }
985
986 static void command_post_select(struct sched *s, struct task *t)
987 {
988 int ret;
989 struct command_task *ct = container_of(t, struct command_task, task);
990 static struct timeval last_status_dump;
991 struct timeval tmp, delay = {0, 500 * 1000};
992
993 tv_add(&last_status_dump, &delay, &tmp);
994 if (tv_diff(&tmp, now, NULL) < 0) {
995 audiod_status_dump();
996 last_status_dump = *now;
997 }
998
999 if (!FD_ISSET(ct->fd, &s->rfds))
1000 return;
1001 ret = handle_connect(ct->fd);
1002 if (ret < 0)
1003 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1004 }
1005
1006 static void init_command_task(struct command_task *ct)
1007 {
1008 ct->task.pre_select = command_pre_select;
1009 ct->task.post_select = command_post_select;
1010 ct->task.error = 0;
1011 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1012 sprintf(ct->task.status, "command task");
1013 }
1014
1015 static void close_stat_pipe(void)
1016 {
1017 if (!stat_task->ct)
1018 return;
1019 btr_free_node(stat_task->ct->btrn);
1020 client_close(stat_task->ct);
1021 stat_task->ct = NULL;
1022 clear_and_dump_items();
1023 stat_task->length_seconds = 0;
1024 stat_task->offset_seconds = 0;
1025 stat_task->vss_status = 0;
1026 stat_task->current_audio_format_num = -1;
1027 audiod_status_dump();
1028 }
1029
1030 /**
1031 * close the connection to para_server and exit
1032 *
1033 * \param status the exit status which is passed to exit(3)
1034 * \param msg the log message
1035 *
1036 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1037 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1038 * EXIT_FAILURE.
1039 *
1040 * \sa exit(3)
1041 */
1042 void __noreturn clean_exit(int status, const char *msg)
1043 {
1044 PARA_EMERG_LOG("%s\n", msg);
1045 if (socket_name)
1046 unlink(socket_name);
1047 close_stat_pipe();
1048 exit(status);
1049 }
1050
1051 /* avoid busy loop if server is down */
1052 static void set_stat_task_restart_barrier(unsigned seconds)
1053 {
1054 struct timeval delay = {seconds, 0};
1055 tv_add(now, &delay, &stat_task->restart_barrier);
1056 }
1057
1058 static void try_to_close_slot(int slot_num)
1059 {
1060 struct slot_info *s = &slot[slot_num];
1061 struct audio_format_info *a = afi + s->format;
1062 int i;
1063
1064 if (s->format < 0)
1065 return;
1066 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1067 return;
1068 for (i = 0; i < a->num_filters; i++)
1069 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1070 return;
1071 if (a->num_writers > 0) {
1072 for (i = 0; i < a->num_writers; i++)
1073 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1074 return;
1075 } else {
1076 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1077 return;
1078 }
1079 PARA_INFO_LOG("closing slot %d\n", slot_num);
1080 close_writers(s);
1081 close_filters(s);
1082 close_receiver(slot_num);
1083 clear_slot(slot_num);
1084 }
1085
1086 /*
1087 * Check if any receivers/filters/writers need to be started and do so if
1088 * necessary.
1089 */
1090 static void start_stop_decoders(void)
1091 {
1092 int i, ret;
1093 struct slot_info *sl;
1094 struct audio_format_info *a;
1095
1096 FOR_EACH_SLOT(i)
1097 try_to_close_slot(i);
1098 if (audiod_status != AUDIOD_ON ||
1099 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1100 return kill_all_decoders(-E_NOT_PLAYING);
1101 ret = open_current_receiver();
1102 if (ret < 0)
1103 return;
1104 sl = slot + ret;
1105 a = afi + sl->format;
1106 if (a->num_filters)
1107 open_filters(sl);
1108 open_writers(sl);
1109 activate_grab_clients();
1110 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1111 }
1112
1113 static void status_pre_select(struct sched *s, struct task *t)
1114 {
1115 struct status_task *st = container_of(t, struct status_task, task);
1116 int ret;
1117
1118 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1119 sched_request_barrier(&st->restart_barrier, s);
1120 }
1121
1122 /* restart the client task if necessary */
1123 static void status_post_select(__a_unused struct sched *s, struct task *t)
1124 {
1125 struct status_task *st = container_of(t, struct status_task, task);
1126
1127 if (audiod_status == AUDIOD_OFF) {
1128 if (!st->ct)
1129 goto out;
1130 if (st->ct->task.error >= 0) {
1131 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1132 goto out;
1133 }
1134 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1135 goto out;
1136 close_stat_pipe();
1137 st->clock_diff_count = conf.clock_diff_count_arg;
1138 goto out;
1139 }
1140 if (st->ct) {
1141 char *buf;
1142 size_t sz;
1143 int ret;
1144 if (st->ct->task.error < 0) {
1145 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1146 goto out;
1147 close_stat_pipe();
1148 goto out;
1149 }
1150 if (st->ct->status != CL_RECEIVING)
1151 goto out;
1152 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1153 if (ret <= 0)
1154 goto out;
1155 sz = btr_next_buffer(st->btrn, &buf);
1156 ret = for_each_stat_item(buf, sz, update_item);
1157 if (ret < 0) {
1158 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1159 goto out;
1160 }
1161 if (sz != ret)
1162 st->last_status_read = *now;
1163 else {
1164 struct timeval diff;
1165 tv_diff(now, &st->last_status_read, &diff);
1166 if (diff.tv_sec > 61)
1167 kill_btrn(st->ct->btrn, &st->ct->task,
1168 -E_STATUS_TIMEOUT);
1169 }
1170 btr_consume(st->btrn, sz - ret);
1171 goto out;
1172 }
1173 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1174 goto out;
1175 if (st->clock_diff_count) { /* get status only one time */
1176 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1177 int argc = 5;
1178 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1179 st->clock_diff_count--;
1180 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1181 set_stat_task_restart_barrier(2);
1182
1183 } else {
1184 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1185 int argc = 4;
1186 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1187 set_stat_task_restart_barrier(5);
1188 }
1189 free(stat_item_values[SI_BASENAME]);
1190 stat_item_values[SI_BASENAME] = para_strdup(
1191 "no connection to para_server");
1192 stat_client_write_item(SI_BASENAME);
1193 st->last_status_read = *now;
1194 out:
1195 start_stop_decoders();
1196 }
1197
1198 static void init_status_task(struct status_task *st)
1199 {
1200 memset(st, 0, sizeof(struct status_task));
1201 st->task.pre_select = status_pre_select;
1202 st->task.post_select = status_post_select;
1203 st->sa_time_diff_sign = 1;
1204 st->clock_diff_count = conf.clock_diff_count_arg;
1205 st->current_audio_format_num = -1;
1206 sprintf(st->task.status, "stat");
1207 st->btrn = btr_new_node(&(struct btr_node_description)
1208 EMBRACE(.name = "stat"));
1209 }
1210
1211 static void set_initial_status(void)
1212 {
1213 audiod_status = AUDIOD_ON;
1214 if (!conf.mode_given)
1215 return;
1216 if (!strcmp(conf.mode_arg, "sb")) {
1217 audiod_status = AUDIOD_STANDBY;
1218 return;
1219 }
1220 if (!strcmp(conf.mode_arg, "off")) {
1221 audiod_status = AUDIOD_OFF;
1222 return;
1223 }
1224 if (strcmp(conf.mode_arg, "on"))
1225 PARA_WARNING_LOG("invalid mode\n");
1226 }
1227
1228 __noreturn static void print_help_and_die(void)
1229 {
1230 int d = conf.detailed_help_given;
1231 const char **p = d? audiod_args_info_detailed_help
1232 : audiod_args_info_help;
1233
1234 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1235 AUDIOD_CMDLINE_PARSER_VERSION);
1236 printf_or_die("%s\n\n", audiod_args_info_usage);
1237 for (; *p; p++)
1238 printf_or_die("%s\n", *p);
1239 print_receiver_helps(d);
1240 print_filter_helps(d);
1241 print_writer_helps(d);
1242 exit(0);
1243 }
1244
1245 static void init_colors_or_die(void)
1246 {
1247 int ret, i;
1248
1249 if (!want_colors())
1250 return;
1251 daemon_set_default_log_colors();
1252 daemon_set_flag(DF_COLOR_LOG);
1253 for (i = 0; i < conf.log_color_given; i++) {
1254 ret = daemon_set_log_color(conf.log_color_arg[i]);
1255 if (ret < 0)
1256 exit(EXIT_FAILURE);
1257 }
1258 }
1259
1260 /**
1261 * the main function of para_audiod
1262 *
1263 * \param argc usual argument count
1264 * \param argv usual argument vector
1265 *
1266 * \return EXIT_SUCCESS or EXIT_FAILURE
1267 *
1268 * \sa para_audiod(1)
1269 * */
1270 int main(int argc, char *argv[])
1271 {
1272 int ret, i;
1273 static struct sched s;
1274 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1275 struct audiod_cmdline_parser_params params = {
1276 .override = 0,
1277 .initialize = 1,
1278 .check_required = 0,
1279 .check_ambiguity = 0,
1280 .print_errors = 1
1281 };
1282
1283 valid_fd_012();
1284 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1285 exit(EXIT_FAILURE);
1286 HANDLE_VERSION_FLAG("audiod", conf);
1287 /* init receivers/filters/writers early to make help work */
1288 recv_init();
1289 filter_init();
1290 writer_init();
1291 if (conf.help_given || conf.detailed_help_given)
1292 print_help_and_die();
1293 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1294 parse_config_or_die();
1295 init_colors_or_die();
1296 init_random_seed_or_die();
1297 daemon_set_flag(DF_LOG_TIME);
1298 daemon_set_flag(DF_LOG_HOSTNAME);
1299 daemon_set_flag(DF_LOG_LL);
1300 if (conf.log_timing_given)
1301 daemon_set_flag(DF_LOG_TIMING);
1302 if (conf.logfile_given) {
1303 daemon_set_logfile(conf.logfile_arg);
1304 daemon_open_log_or_die();
1305 }
1306 ret = parse_stream_args();
1307 if (ret < 0) {
1308 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1309 exit(EXIT_FAILURE);
1310 }
1311 log_welcome("para_audiod");
1312 server_uptime(UPTIME_SET);
1313 set_initial_status();
1314 FOR_EACH_SLOT(i)
1315 clear_slot(i);
1316 setup_signal_handling();
1317 signal_setup_default(sig_task);
1318
1319 init_status_task(stat_task);
1320 init_command_task(cmd_task);
1321
1322 if (conf.daemon_given)
1323 daemonize();
1324
1325 register_task(&sig_task->task);
1326 register_task(&cmd_task->task);
1327 register_task(&stat_task->task);
1328 s.default_timeout.tv_sec = 2;
1329 s.default_timeout.tv_usec = 999 * 1000;
1330 ret = schedule(&s);
1331
1332 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1333 return EXIT_FAILURE;
1334 }