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