Remove some unnecessary includes.
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2011 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 <signal.h>
11 #include <stdbool.h>
12
13 #include "para.h"
14 #include "error.h"
15 #include "crypt.h"
16 #include "audiod.cmdline.h"
17 #include "list.h"
18 #include "sched.h"
19 #include "ggo.h"
20 #include "recv.h"
21 #include "buffer_tree.h"
22 #include "filter.h"
23 #include "grab_client.h"
24 #include "client.cmdline.h"
25 #include "client.h"
26 #include "audiod.h"
27 #include "net.h"
28 #include "daemon.h"
29 #include "string.h"
30 #include "fd.h"
31 #include "write.h"
32 #include "write_common.h"
33 #include "signal.h"
34
35 /** define the array of error lists needed by para_audiod */
36 INIT_AUDIOD_ERRLISTS;
37 /** define the array containing all supported audio formats */
38 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
39
40 /** Defines how audiod handles one supported audio format. */
41 struct audio_format_info {
42 /** pointer to the receiver for this audio format */
43 struct receiver *receiver;
44 /** the receiver configuration */
45 void *receiver_conf;
46 /** the number of filters that should be activated for this audio format */
47 unsigned int num_filters;
48 /** Array of filter numbers to be activated. */
49 unsigned *filter_nums;
50 /** Pointer to the array of filter configurations. */
51 void **filter_conf;
52 /** the number of filters that should be activated for this audio format */
53 unsigned int num_writers;
54 /** Array of writer numbers to be activated. */
55 int *writer_nums;
56 /** pointer to the array of writer configurations */
57 void **writer_conf;
58 /** do not start receiver/filters/writer before this time */
59 struct timeval restart_barrier;
60 };
61
62 /**
63 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
64 * be associated with a receiver/filter/writer triple. This array holds all
65 * information on the status of these slots.
66 *
67 * \sa struct slot_info
68 * */
69 struct slot_info slot[MAX_STREAM_SLOTS];
70
71 /** The vss status flags audiod is interested in. */
72 enum vss_status_flags {
73 /** Whether the 'N' flag is set. */
74 VSS_STATUS_FLAG_NEXT = 1,
75 /** The 'P' flag is set. */
76 VSS_STATUS_FLAG_PLAYING = 2,
77 };
78
79 /**
80 * The task for obtaining para_server's status (para_client stat).
81 *
82 * \sa struct task, struct sched.
83 */
84 struct status_task {
85 /** The associated task structure of audiod. */
86 struct task task;
87 /** Client data associated with the stat task. */
88 struct client_task *ct;
89 /** Do not restart client command until this time. */
90 struct timeval restart_barrier;
91 /** Last time we received status data from para_server. */
92 struct timeval last_status_read;
93 size_t min_iqs;
94 /** The offset value announced by para_server. */
95 int offset_seconds;
96 /** The length of the current audio file as announced by para_server. */
97 int length_seconds;
98 /** The start of the current stream from the view of para_server. */
99 struct timeval server_stream_start;
100 /** The average time deviation between para_server and para_audiod. */
101 struct timeval sa_time_diff;
102 /** Whether client time is ahead of server time. */
103 int sa_time_diff_sign;
104 /** The 'P' and the 'N' flags as announced by para_server. */
105 enum vss_status_flags vss_status;
106 /** Number of times the clock difference is to be checked. */
107 unsigned clock_diff_count;
108 /** When to start the next check for clock difference. */
109 struct timeval clock_diff_barrier;
110 /** Number of the audio format as announced by para_server. */
111 int current_audio_format_num;
112 /* The status task btrn is the child of the client task. */
113 struct btr_node *btrn;
114 };
115
116 /** The array of status items sent by para_server. */
117 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
118
119 /**
120 * the current mode of operation of which can be changed by the on/off/cycle
121 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
122 */
123 int audiod_status = AUDIOD_ON;
124
125 /**
126 * the gengetopt args_info struct that holds information on all command line
127 * arguments
128 */
129 struct audiod_args_info conf;
130
131 static char *socket_name;
132 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
133
134 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
135
136 static struct status_task status_task_struct;
137
138 /**
139 * the task that calls the status command of para_server
140 *
141 * \sa struct status_task
142 */
143 static struct status_task *stat_task = &status_task_struct;
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 *
163 * \param name The name of the audio format.
164 *
165 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
166 * \a name is not a supported audio format.
167 */
168 static int get_audio_format_num(const char *name)
169 {
170 int i;
171
172 while (para_isspace(*name))
173 name++;
174 FOR_EACH_AUDIO_FORMAT(i)
175 if (!strcmp(name, audio_formats[i]))
176 return i;
177 return -E_UNSUPPORTED_AUDIO_FORMAT;
178 }
179
180 /**
181 * Compute the play time based on information of the given slot.
182 *
183 * \param slot_num The slot number (negative means: no slot).
184 *
185 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
186 * from the status items received from para_server and the start time of the
187 * (first) writer of the given slot.
188 *
189 * It has to to take into account that probably the stream was not started at
190 * the beginning of the file, that the clock between the server and the client
191 * host may differ and that playback of the stream was delayed, e.g. because
192 * the prebuffer filter is used in the filter configuration of the given slot.
193 *
194 * If no writer is active in the given slot, or \a slot_num is negative
195 * (indicating that para_audiod runs in standby mode), an approximation based
196 * only on the status items is computed and the returned string is prefixed
197 * with "~".
198 *
199 * \return A string that must be freed by the caller.
200 */
201 char *get_time_string(int slot_num)
202 {
203 int ret, seconds = 0, length;
204 struct timeval *tmp, sum, sss, /* server stream start */
205 rstime, /* receiver start time */
206 wstime, /* writer start time */
207 wtime, /* now - writer start */
208 rskip; /* receiver start - sss */
209 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
210 char *msg;
211
212 if (audiod_status == AUDIOD_OFF)
213 goto empty;
214 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
215 if (stat_task->length_seconds) /* paused */
216 return NULL;
217 goto empty; /* stopped */
218 }
219 if (audiod_status == AUDIOD_ON && !s)
220 goto empty;
221 /*
222 * Valid status items and playing, set length and tmp to the stream
223 * start. We use the slot info and fall back to the info from current
224 * status items if no slot info is available.
225 */
226 length = stat_task->length_seconds;
227 tmp = &stat_task->server_stream_start;
228 if (s && s->wns) { /* writer active in this slot */
229 btr_get_node_start(s->wns[0].btrn, &wstime);
230 if (wstime.tv_sec != 0) { /* writer wrote something */
231 if (s->server_stream_start.tv_sec == 0) {
232 /* copy status info to slot */
233 s->server_stream_start = stat_task->server_stream_start;
234 s->offset_seconds = stat_task->offset_seconds;
235 s->seconds_total = stat_task->length_seconds;
236 }
237 length = s->seconds_total;
238 tmp = &s->server_stream_start;
239 }
240 }
241 if (stat_task->sa_time_diff_sign > 0)
242 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
243 else
244 tv_add(tmp, &stat_task->sa_time_diff, &sss);
245 if (!s || !s->wns) {
246 struct timeval diff;
247 tv_diff(now, &sss, &diff);
248 seconds = diff.tv_sec + stat_task->offset_seconds;
249 goto out;
250 }
251 tv_diff(now, &wstime, &wtime);
252 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
253 seconds = s->offset_seconds;
254 btr_get_node_start(s->receiver_node->btrn, &rstime);
255 ret = tv_diff(&rstime, &sss, &rskip);
256 if (ret > 0) { /* audiod was started in the middle of the stream */
257 tv_add(&wtime, &rskip, &sum);
258 seconds += sum.tv_sec;
259 } else
260 seconds += wtime.tv_sec;
261 out:
262 seconds = PARA_MIN(seconds, length);
263 seconds = PARA_MAX(seconds, 0);
264 msg = make_message(
265 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
266 s? "" : "~",
267 seconds / 60,
268 seconds % 60,
269 (length - seconds) / 60,
270 (length - seconds) % 60,
271 length? (seconds * 100 + length / 2) / length : 0,
272 length / 60,
273 length % 60
274 );
275 PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
276 return msg;
277 empty:
278 return para_strdup(NULL);
279 }
280
281 static int want_colors(void)
282 {
283 if (conf.color_arg == color_arg_no)
284 return 0;
285 if (conf.color_arg == color_arg_yes)
286 return 1;
287 if (conf.logfile_given)
288 return 0;
289 return isatty(STDERR_FILENO);
290 }
291
292 static void parse_config_or_die(void)
293 {
294 int ret;
295 char *config_file;
296 struct audiod_cmdline_parser_params params = {
297 .override = 0,
298 .initialize = 0,
299 .check_required = 1,
300 .check_ambiguity = 0,
301 .print_errors = 1
302 };
303
304 if (conf.config_file_given)
305 config_file = para_strdup(conf.config_file_arg);
306 else {
307 char *home = para_homedir();
308 config_file = make_message("%s/.paraslash/audiod.conf", home);
309 free(home);
310 }
311 ret = file_exists(config_file);
312 if (conf.config_file_given && !ret) {
313 PARA_EMERG_LOG("can not read config file %s\n", config_file);
314 goto err;
315 }
316 if (ret)
317 audiod_cmdline_parser_config_file(config_file, &conf, &params);
318 free(config_file);
319 daemon_set_loglevel(conf.loglevel_arg);
320 return;
321 err:
322 free(config_file);
323 exit(EXIT_FAILURE);
324 }
325
326 static void setup_signal_handling(void)
327 {
328 sig_task->fd = para_signal_init();
329 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
330 para_install_sighandler(SIGINT);
331 para_install_sighandler(SIGTERM);
332 para_install_sighandler(SIGHUP);
333 para_sigaction(SIGPIPE, SIG_IGN);
334 }
335
336 static void clear_slot(int slot_num)
337 {
338 struct slot_info *s = &slot[slot_num];
339
340 PARA_INFO_LOG("clearing slot %d\n", slot_num);
341 memset(s, 0, sizeof(struct slot_info));
342 s->format = -1;
343 }
344
345 static void close_receiver(int slot_num)
346 {
347 struct slot_info *s = &slot[slot_num];
348 struct audio_format_info *a;
349
350 if (s->format < 0 || !s->receiver_node)
351 return;
352 a = &afi[s->format];
353 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
354 audio_formats[s->format], slot_num);
355 a->receiver->close(s->receiver_node);
356 btr_free_node(s->receiver_node->btrn);
357 free(s->receiver_node);
358 s->receiver_node = NULL;
359 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
360 &a->restart_barrier);
361 }
362
363 static void writer_cleanup(struct writer_node *wn)
364 {
365 struct writer *w;
366
367 if (!wn)
368 return;
369 w = writers + wn->writer_num;
370 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
371 w->close(wn);
372 btr_free_node(wn->btrn);
373 }
374
375 static void close_writers(struct slot_info *s)
376 {
377 struct audio_format_info *a;
378 int i;
379
380 if (s->format < 0)
381 return;
382 assert(s->wns);
383 a = afi + s->format;
384 if (a->num_writers == 0)
385 writer_cleanup(s->wns);
386 else {
387 for (i = 0; i < a->num_writers; i++)
388 writer_cleanup(s->wns + i);
389 }
390 free(s->wns);
391 s->wns = NULL;
392 }
393
394 static void close_filters(struct slot_info *s)
395 {
396 int i;
397 struct audio_format_info *a = afi + s->format;
398 if (a->num_filters == 0)
399 return;
400 for (i = 0; i < a->num_filters; i++) {
401 struct filter_node *fn = s->fns + i;
402 struct filter *f;
403
404 if (!fn)
405 continue;
406 f = filters + fn->filter_num;
407 if (f->close)
408 f->close(fn);
409 btr_free_node(fn->btrn);
410 }
411 free(s->fns);
412 s->fns = NULL;
413 }
414
415 /*
416 * Whenever a task commits suicide by returning from post_select with t->error
417 * < 0, it also removes its btr node. We do exactly that to kill a running
418 * task. Note that the scheduler checks t->error also _before_ each pre/post
419 * select call, so the victim will never be scheduled again.
420 */
421 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
422 {
423 if (t->error < 0)
424 return;
425 t->error = error;
426 btr_remove_node(btrn);
427 }
428
429 static void kill_all_decoders(int error)
430 {
431 int i, j;
432
433 FOR_EACH_SLOT(i) {
434 struct slot_info *s = &slot[i];
435 struct audio_format_info *a;
436 if (s->format < 0)
437 continue;
438 a = afi + s->format;
439 if (s->wns)
440 for (j = 0; j < a->num_writers; j++)
441 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
442 if (s->fns)
443 for (j = 0; j < a->num_writers; j++)
444 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
445 if (s->receiver_node)
446 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
447 error);
448 }
449 }
450
451 static int get_empty_slot(void)
452 {
453 int i;
454 struct slot_info *s;
455
456 FOR_EACH_SLOT(i) {
457 s = &slot[i];
458 if (s->format < 0) {
459 clear_slot(i);
460 return i;
461 }
462 if (s->wns || s->receiver_node || s->fns)
463 continue;
464 clear_slot(i);
465 return i;
466 }
467 return -E_NO_MORE_SLOTS;
468 }
469
470 static void open_filters(struct slot_info *s)
471 {
472 struct audio_format_info *a = afi + s->format;
473 struct filter_node *fn;
474 int nf = a->num_filters;
475 struct btr_node *parent;
476 int i;
477
478 if (nf == 0)
479 return;
480 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
481 assert(s->fns == NULL);
482 s->fns = para_calloc(nf * sizeof(struct filter_node));
483 parent = s->receiver_node->btrn;
484 for (i = 0; i < nf; i++) {
485 struct filter *f = filters + a->filter_nums[i];
486 fn = s->fns + i;
487 fn->filter_num = a->filter_nums[i];
488 fn->conf = a->filter_conf[i];
489 fn->task.pre_select = f->pre_select;
490 fn->task.post_select = f->post_select;
491
492 fn->btrn = btr_new_node(&(struct btr_node_description)
493 EMBRACE(.name = f->name, .parent = parent,
494 .handler = f->execute, .context = fn));
495
496 f->open(fn);
497 register_task(&fn->task);
498 parent = fn->btrn;
499 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
500 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
501 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
502 }
503 }
504
505 static void open_writers(struct slot_info *s)
506 {
507 int i;
508 struct audio_format_info *a = afi + s->format;
509 struct writer_node *wn;
510 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
511
512 assert(s->wns == NULL);
513 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
514 * sizeof(struct writer_node));
515 if (a->num_writers == 0)
516 setup_writer_node(NULL, parent, s->wns);
517 else {
518 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
519 for (i = 0; i < a->num_writers; i++) {
520 wn = s->wns + i;
521 wn->conf = a->writer_conf[i];
522 wn->writer_num = a->writer_nums[i];
523 register_writer_node(wn, parent);
524 }
525 }
526 }
527
528 /* returns slot num on success */
529 static int open_receiver(int format)
530 {
531 struct audio_format_info *a = &afi[format];
532 struct slot_info *s;
533 int ret, slot_num;
534 struct receiver *r = a->receiver;
535 struct receiver_node *rn;
536
537 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
538 ret = get_empty_slot();
539 if (ret < 0)
540 return ret;
541 slot_num = ret;
542 rn = para_calloc(sizeof(*rn));
543 rn->receiver = r;
544 rn->conf = a->receiver_conf;
545 rn->btrn = btr_new_node(&(struct btr_node_description)
546 EMBRACE(.name = r->name, .context = rn));
547 ret = r->open(rn);
548 if (ret < 0) {
549 btr_free_node(rn->btrn);
550 free(rn);
551 return ret;
552 }
553 s = &slot[slot_num];
554 s->format = format;
555 s->receiver_node = rn;
556 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
557 audio_formats[format], r->name, slot_num);
558 rn->task.pre_select = r->pre_select;
559 rn->task.post_select = r->post_select;
560 sprintf(rn->task.status, "%s receiver node", r->name);
561 register_task(&rn->task);
562 return slot_num;
563 }
564
565 static bool receiver_running(void)
566 {
567 int i;
568 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
569
570 FOR_EACH_SLOT(i) {
571 struct slot_info *s = &slot[i];
572 long unsigned ss2 = s->server_stream_start.tv_sec;
573
574 if (!s->receiver_node)
575 continue;
576 if (s->receiver_node->task.error >= 0)
577 return true;
578 if (ss1 == ss2)
579 return true;
580 }
581 return false;
582 }
583
584 /**
585 * Return the root node of the current buffer tree.
586 *
587 * This is only used for stream grabbing.
588 *
589 * \return \p NULL if no slot is currently active. If more than one buffer tree
590 * exists, the node corresponding to the most recently started receiver is
591 * returned.
592 */
593 struct btr_node *audiod_get_btr_root(void)
594 {
595 int i, newest_slot = -1;
596 struct timeval newest_rstime = {0, 0};
597
598 FOR_EACH_SLOT(i) {
599 struct slot_info *s = &slot[i];
600 struct timeval rstime;
601 if (!s->receiver_node)
602 continue;
603 if (s->receiver_node->task.error < 0)
604 continue;
605 btr_get_node_start(s->receiver_node->btrn, &rstime);
606 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
607 continue;
608 newest_rstime = rstime;
609 newest_slot = i;
610 }
611 if (newest_slot == -1)
612 return NULL;
613 return slot[newest_slot].receiver_node->btrn;
614 }
615
616 /* whether a new instance of a decoder should be started. */
617 static bool must_start_decoder(void)
618 {
619 int cafn = stat_task->current_audio_format_num;
620 unsigned vs = stat_task->vss_status;
621
622 if (audiod_status != AUDIOD_ON)
623 return false;
624 if (cafn < 0)
625 return false;
626 if (!stat_task->ct)
627 return false;
628 if (vs & VSS_STATUS_FLAG_NEXT)
629 return false;
630 if (!(vs & VSS_STATUS_FLAG_PLAYING))
631 return false;
632 if (receiver_running())
633 return false;
634 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
635 return false;
636 return true;
637 }
638
639 static unsigned compute_time_diff(const struct timeval *status_time)
640 {
641 struct timeval tmp, diff;
642 static unsigned count;
643 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
644 const struct timeval max_deviation = {0, 500 * 1000};
645 const int time_smooth = 5;
646
647 if (!status_time)
648 return count;
649 sign = tv_diff(status_time, now, &diff);
650 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
651 // sign, sa_time_diff_sign);
652 if (!count) {
653 sa_time_diff_sign = sign;
654 stat_task->sa_time_diff = diff;
655 count++;
656 goto out;
657 }
658 if (count > 5) {
659 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
660 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
661 PARA_WARNING_LOG("time diff jump: %lims\n",
662 s * tv2ms(&tmp));
663 }
664 count++;
665 sa_time_diff_sign = tv_convex_combination(
666 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
667 count > 10? sign : sign * time_smooth, &diff,
668 &tmp);
669 stat_task->sa_time_diff = tmp;
670 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
671 sign < 0? "-" : "+",
672 tv2ms(&diff),
673 sa_time_diff_sign < 0? "-" : "+",
674 tv2ms(&stat_task->sa_time_diff)
675 );
676 out:
677 stat_task->sa_time_diff_sign = sa_time_diff_sign;
678 return count;
679 }
680
681 static int update_item(int itemnum, char *buf)
682 {
683 long unsigned sec, usec;
684
685 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
686 return 1;
687 free(stat_item_values[itemnum]);
688 stat_item_values[itemnum] = para_strdup(buf);
689 stat_client_write_item(itemnum);
690 switch (itemnum) {
691 case SI_STATUS_FLAGS:
692 stat_task->vss_status = 0;
693 if (strchr(buf, 'N'))
694 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
695 if (strchr(buf, 'P'))
696 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
697 break;
698 case SI_OFFSET:
699 stat_task->offset_seconds = atoi(buf);
700 break;
701 case SI_SECONDS_TOTAL:
702 stat_task->length_seconds = atoi(buf);
703 break;
704 case SI_STREAM_START:
705 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
706 stat_task->server_stream_start.tv_sec = sec;
707 stat_task->server_stream_start.tv_usec = usec;
708 }
709 break;
710 case SI_CURRENT_TIME:
711 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
712 struct timeval tv = {sec, usec};
713 compute_time_diff(&tv);
714 }
715 break;
716 case SI_FORMAT:
717 stat_task->current_audio_format_num
718 = get_audio_format_num(buf);
719 }
720 return 1;
721 }
722
723 static int parse_stream_command(const char *txt, char **cmd)
724 {
725 char *p = strchr(txt, ':');
726 int i;
727
728 if (!p)
729 return -E_MISSING_COLON;
730 p++;
731 FOR_EACH_AUDIO_FORMAT(i) {
732 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
733 continue;
734 *cmd = p;
735 return i;
736 }
737 return -E_UNSUPPORTED_AUDIO_FORMAT;
738 }
739
740 static int add_filter(int format, char *cmdline)
741 {
742 struct audio_format_info *a = &afi[format];
743 int filter_num, nf = a->num_filters;
744
745 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
746 if (filter_num < 0)
747 return filter_num;
748 a->filter_nums[nf] = filter_num;
749 a->num_filters++;
750 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
751 filters[filter_num].name);
752 return filter_num;
753 }
754
755 static int parse_writer_args(void)
756 {
757 int i, ret, nw;
758 char *cmd;
759 struct audio_format_info *a;
760
761 nw = PARA_MAX(1U, conf.writer_given);
762 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
763 FOR_EACH_AUDIO_FORMAT(i) {
764 a = &afi[i];
765 a->writer_conf = para_malloc(nw * sizeof(void *));
766 a->writer_nums = para_malloc(nw * sizeof(int));
767 a->num_writers = 0;
768 }
769 for (i = 0; i < conf.writer_given; i++) {
770 void *wconf;
771 int writer_num;
772 ret = parse_stream_command(conf.writer_arg[i], &cmd);
773 if (ret < 0)
774 goto out;
775 a = &afi[ret];
776 nw = a->num_writers;
777 wconf = check_writer_arg(cmd, &writer_num);
778 if (!wconf) {
779 ret = writer_num;
780 goto out;
781 }
782 a->writer_nums[nw] = writer_num;
783 a->writer_conf[nw] = wconf;
784 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
785 nw, writer_names[writer_num]);
786 a->num_writers++;
787 }
788 ret = 1;
789 out:
790 return ret;
791 }
792
793 static int parse_receiver_args(void)
794 {
795 int i, ret, receiver_num;
796 char *cmd = NULL;
797 struct audio_format_info *a;
798
799 for (i = conf.receiver_given - 1; i >= 0; i--) {
800 char *arg = conf.receiver_arg[i];
801 char *recv_arg = strchr(arg, ':');
802 ret = -E_MISSING_COLON;
803 if (!recv_arg)
804 goto out;
805 *recv_arg = '\0';
806 recv_arg++;
807 ret = get_audio_format_num(arg);
808 if (ret < 0)
809 goto out;
810 /*
811 * If multiple receivers are given for this audio format, the
812 * last one wins and we have to free the previous receiver
813 * config here. Since we are iterating backwards, the winning
814 * receiver arg is in fact the first one given.
815 */
816 if (afi[ret].receiver_conf)
817 afi[ret].receiver->free_config(afi[ret].receiver_conf);
818 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
819 if (!afi[ret].receiver_conf) {
820 ret = -E_RECV_SYNTAX;
821 goto out;
822 }
823 afi[ret].receiver = &receivers[receiver_num];
824 }
825 /*
826 * Use the first available receiver with no arguments for those audio
827 * formats for which no receiver was specified.
828 */
829 cmd = para_strdup(receivers[0].name);
830 FOR_EACH_AUDIO_FORMAT(i) {
831 a = &afi[i];
832 if (a->receiver_conf)
833 continue;
834 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
835 if (!a->receiver_conf)
836 return -E_RECV_SYNTAX;
837 a->receiver = &receivers[receiver_num];
838 }
839 ret = 1;
840 out:
841 free(cmd);
842 return ret;
843 }
844
845 static int init_default_filters(void)
846 {
847 int i, ret = 1;
848
849 FOR_EACH_AUDIO_FORMAT(i) {
850 struct audio_format_info *a = &afi[i];
851 char *tmp;
852 int j;
853
854 if (a->num_filters)
855 continue; /* no default -- nothing to to */
856 /*
857 * If udp is used to receive this audiod format, add fecdec as
858 * the first filter.
859 */
860 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
861 strcmp(afi[i].receiver->name, "dccp") == 0) {
862 tmp = para_strdup("fecdec");
863 add_filter(i, tmp);
864 free(tmp);
865 if (ret < 0)
866 goto out;
867 }
868 /* add "dec" to audio format name */
869 tmp = make_message("%sdec", audio_formats[i]);
870 for (j = 0; filters[j].name; j++)
871 if (!strcmp(tmp, filters[j].name))
872 break;
873 free(tmp);
874 ret = -E_UNSUPPORTED_FILTER;
875 if (!filters[j].name)
876 goto out;
877 tmp = para_strdup(filters[j].name);
878 ret = add_filter(i, tmp);
879 free(tmp);
880 if (ret < 0)
881 goto out;
882 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
883 filters[j].name);
884 }
885 out:
886 return ret;
887 }
888
889 static int parse_filter_args(void)
890 {
891 int i, ret, nf;
892
893 nf = PARA_MAX(2U, conf.filter_given);
894 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
895 FOR_EACH_AUDIO_FORMAT(i) {
896 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
897 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
898 }
899 if (!conf.no_default_filters_given)
900 return init_default_filters();
901 for (i = 0; i < conf.filter_given; i++) {
902 char *arg = conf.filter_arg[i];
903 char *filter_name = strchr(arg, ':');
904 ret = -E_MISSING_COLON;
905 if (!filter_name)
906 goto out;
907 *filter_name = '\0';
908 filter_name++;
909 ret = get_audio_format_num(arg);
910 if (ret < 0)
911 goto out;
912 ret = add_filter(ret, filter_name);
913 if (ret < 0)
914 goto out;
915 }
916 ret = init_default_filters(); /* use default values for the rest */
917 out:
918 return ret;
919 }
920
921 static int parse_stream_args(void)
922 {
923 int ret;
924
925 ret = parse_receiver_args();
926 if (ret < 0)
927 return ret;
928 ret = parse_filter_args();
929 if (ret < 0)
930 return ret;
931 ret = parse_writer_args();
932 if (ret < 0)
933 return ret;
934 return 1;
935 }
936
937 /* does not unlink socket on errors */
938 static int audiod_get_socket(void)
939 {
940 struct sockaddr_un unix_addr;
941 int ret, fd;
942
943 if (conf.socket_given)
944 socket_name = para_strdup(conf.socket_arg);
945 else {
946 char *hn = para_hostname();
947 socket_name = make_message("/var/paraslash/audiod_socket.%s",
948 hn);
949 free(hn);
950 }
951 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
952 if (conf.force_given)
953 unlink(socket_name);
954 ret = create_local_socket(socket_name, &unix_addr,
955 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
956 if (ret < 0)
957 goto err;
958 fd = ret;
959 if (listen(fd , 5) < 0) {
960 ret = -ERRNO_TO_PARA_ERROR(errno);
961 goto err;
962 }
963 ret = mark_fd_nonblocking(fd);
964 if (ret < 0)
965 goto err;
966 return fd;
967 err:
968 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
969 exit(EXIT_FAILURE);
970 }
971
972 static void signal_pre_select(struct sched *s, struct task *t)
973 {
974 struct signal_task *st = container_of(t, struct signal_task, task);
975 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
976 }
977
978 static void signal_post_select(struct sched *s, __a_unused struct task *t)
979 {
980 int signum;
981
982 signum = para_next_signal(&s->rfds);
983 switch (signum) {
984 case SIGINT:
985 case SIGTERM:
986 case SIGHUP:
987 PARA_EMERG_LOG("terminating on signal %d\n", signum);
988 clean_exit(EXIT_FAILURE, "caught deadly signal");
989 }
990 }
991
992 static void signal_setup_default(struct signal_task *st)
993 {
994 st->task.pre_select = signal_pre_select;
995 st->task.post_select = signal_post_select;
996 sprintf(st->task.status, "signal task");
997 }
998
999 static void command_pre_select(struct sched *s, struct task *t)
1000 {
1001 struct command_task *ct = container_of(t, struct command_task, task);
1002 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1003 }
1004
1005 static void command_post_select(struct sched *s, struct task *t)
1006 {
1007 int ret;
1008 struct command_task *ct = container_of(t, struct command_task, task);
1009 static struct timeval last_status_dump;
1010 struct timeval tmp, delay = {0, 500 * 1000};
1011
1012 tv_add(&last_status_dump, &delay, &tmp);
1013 if (tv_diff(&tmp, now, NULL) < 0) {
1014 audiod_status_dump();
1015 last_status_dump = *now;
1016 }
1017
1018 ret = handle_connect(ct->fd, &s->rfds);
1019 if (ret < 0)
1020 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1021 audiod_status_dump();
1022 }
1023
1024 static void init_command_task(struct command_task *ct)
1025 {
1026 ct->task.pre_select = command_pre_select;
1027 ct->task.post_select = command_post_select;
1028 ct->task.error = 0;
1029 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1030 sprintf(ct->task.status, "command task");
1031 }
1032
1033 static void close_stat_pipe(void)
1034 {
1035 if (!stat_task->ct)
1036 return;
1037 btr_free_node(stat_task->ct->btrn);
1038 client_close(stat_task->ct);
1039 stat_task->ct = NULL;
1040 clear_and_dump_items();
1041 stat_task->length_seconds = 0;
1042 stat_task->offset_seconds = 0;
1043 stat_task->vss_status = 0;
1044 stat_task->current_audio_format_num = -1;
1045 audiod_status_dump();
1046 }
1047
1048 /**
1049 * close the connection to para_server and exit
1050 *
1051 * \param status the exit status which is passed to exit(3)
1052 * \param msg the log message
1053 *
1054 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1055 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1056 * EXIT_FAILURE.
1057 *
1058 * \sa exit(3)
1059 */
1060 void __noreturn clean_exit(int status, const char *msg)
1061 {
1062 PARA_EMERG_LOG("%s\n", msg);
1063 if (socket_name)
1064 unlink(socket_name);
1065 close_stat_pipe();
1066 exit(status);
1067 }
1068
1069 /* avoid busy loop if server is down */
1070 static void set_stat_task_restart_barrier(unsigned seconds)
1071 {
1072 struct timeval delay = {seconds, 0};
1073 tv_add(now, &delay, &stat_task->restart_barrier);
1074 }
1075
1076 static void try_to_close_slot(int slot_num)
1077 {
1078 struct slot_info *s = &slot[slot_num];
1079 struct audio_format_info *a = afi + s->format;
1080 int i;
1081
1082 if (s->format < 0)
1083 return;
1084 if (s->receiver_node && s->receiver_node->task.error >= 0)
1085 return;
1086 for (i = 0; i < a->num_filters; i++)
1087 if (s->fns && s->fns[i].task.error >= 0)
1088 return;
1089 if (a->num_writers > 0) {
1090 for (i = 0; i < a->num_writers; i++)
1091 if (s->wns && s->wns[i].task.error >= 0)
1092 return;
1093 } else {
1094 if (s->wns && s->wns[0].task.error >= 0)
1095 return;
1096 }
1097 PARA_INFO_LOG("closing slot %d\n", slot_num);
1098 close_writers(s);
1099 close_filters(s);
1100 close_receiver(slot_num);
1101 clear_slot(slot_num);
1102 }
1103
1104 /*
1105 * Check if any receivers/filters/writers need to be started and do so if
1106 * necessary.
1107 */
1108 static void start_stop_decoders(void)
1109 {
1110 int i, ret;
1111 struct slot_info *sl;
1112 struct audio_format_info *a;
1113
1114 FOR_EACH_SLOT(i)
1115 try_to_close_slot(i);
1116 if (audiod_status != AUDIOD_ON ||
1117 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1118 return kill_all_decoders(-E_NOT_PLAYING);
1119 if (!must_start_decoder())
1120 return;
1121 ret = open_receiver(stat_task->current_audio_format_num);
1122 if (ret < 0) {
1123 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1124 return;
1125 }
1126 sl = slot + ret;
1127 a = afi + sl->format;
1128 if (a->num_filters)
1129 open_filters(sl);
1130 open_writers(sl);
1131 activate_grab_clients();
1132 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1133 }
1134
1135 static void status_pre_select(struct sched *s, struct task *t)
1136 {
1137 struct status_task *st = container_of(t, struct status_task, task);
1138 int ret, cafn = stat_task->current_audio_format_num;
1139
1140 if (must_start_decoder())
1141 goto min_delay;
1142 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1143 if (ret > 0)
1144 goto min_delay;
1145 if (st->ct && audiod_status == AUDIOD_OFF)
1146 goto min_delay;
1147 if (!st->ct && audiod_status != AUDIOD_OFF)
1148 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1149 if (cafn >= 0)
1150 sched_request_barrier(&afi[cafn].restart_barrier, s);
1151 /*
1152 * If para_server is playing we'd like to have a smooth time display
1153 * even if we are running in standby mode. So we request a timeout that
1154 * expires at the next full second.
1155 */
1156 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1157 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1158 return;
1159 min_delay:
1160 sched_min_delay(s);
1161 }
1162
1163 /* restart the client task if necessary */
1164 static void status_post_select(__a_unused struct sched *s, struct task *t)
1165 {
1166 struct status_task *st = container_of(t, struct status_task, task);
1167
1168 if (audiod_status == AUDIOD_OFF) {
1169 if (!st->ct)
1170 goto out;
1171 if (st->ct->task.error >= 0) {
1172 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1173 goto out;
1174 }
1175 if (st->ct->task.error >= 0)
1176 goto out;
1177 close_stat_pipe();
1178 st->clock_diff_count = conf.clock_diff_count_arg;
1179 goto out;
1180 }
1181 if (st->ct) {
1182 char *buf;
1183 size_t sz;
1184 int ret;
1185 if (st->ct->task.error < 0) {
1186 if (st->ct->task.error >= 0)
1187 goto out;
1188 close_stat_pipe();
1189 goto out;
1190 }
1191 if (st->ct->status != CL_RECEIVING)
1192 goto out;
1193 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1194 if (ret <= 0) {
1195 struct timeval diff;
1196 tv_diff(now, &st->last_status_read, &diff);
1197 if (diff.tv_sec > 61)
1198 kill_btrn(st->ct->btrn, &st->ct->task,
1199 -E_STATUS_TIMEOUT);
1200 goto out;
1201 }
1202 btr_merge(st->btrn, st->min_iqs);
1203 sz = btr_next_buffer(st->btrn, &buf);
1204 ret = for_each_stat_item(buf, sz, update_item);
1205 if (ret < 0) {
1206 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1207 goto out;
1208 }
1209 if (sz != ret) {
1210 btr_consume(st->btrn, sz - ret);
1211 st->last_status_read = *now;
1212 st->min_iqs = 0;
1213 } else /* current status item crosses buffers */
1214 st->min_iqs = sz + 1;
1215 goto out;
1216 }
1217 btr_drain(st->btrn);
1218 st->current_audio_format_num = -1;
1219 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1220 goto out;
1221 if (st->clock_diff_count) { /* get status only one time */
1222 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1223 int argc = 5;
1224 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1225 st->clock_diff_count--;
1226 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1227 set_stat_task_restart_barrier(2);
1228
1229 } else {
1230 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1231 int argc = 4;
1232 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1233 set_stat_task_restart_barrier(5);
1234 }
1235 free(stat_item_values[SI_BASENAME]);
1236 stat_item_values[SI_BASENAME] = para_strdup(
1237 "no connection to para_server");
1238 stat_client_write_item(SI_BASENAME);
1239 st->last_status_read = *now;
1240 out:
1241 start_stop_decoders();
1242 }
1243
1244 static void init_status_task(struct status_task *st)
1245 {
1246 memset(st, 0, sizeof(struct status_task));
1247 st->task.pre_select = status_pre_select;
1248 st->task.post_select = status_post_select;
1249 st->sa_time_diff_sign = 1;
1250 st->clock_diff_count = conf.clock_diff_count_arg;
1251 st->current_audio_format_num = -1;
1252 sprintf(st->task.status, "stat");
1253 st->btrn = btr_new_node(&(struct btr_node_description)
1254 EMBRACE(.name = "stat"));
1255 }
1256
1257 static void set_initial_status(void)
1258 {
1259 audiod_status = AUDIOD_ON;
1260 if (!conf.mode_given)
1261 return;
1262 if (!strcmp(conf.mode_arg, "sb")) {
1263 audiod_status = AUDIOD_STANDBY;
1264 return;
1265 }
1266 if (!strcmp(conf.mode_arg, "off")) {
1267 audiod_status = AUDIOD_OFF;
1268 return;
1269 }
1270 if (strcmp(conf.mode_arg, "on"))
1271 PARA_WARNING_LOG("invalid mode\n");
1272 }
1273
1274 __noreturn static void print_help_and_die(void)
1275 {
1276 int d = conf.detailed_help_given;
1277 const char **p = d? audiod_args_info_detailed_help
1278 : audiod_args_info_help;
1279
1280 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1281 AUDIOD_CMDLINE_PARSER_VERSION);
1282 printf_or_die("%s\n\n", audiod_args_info_usage);
1283 for (; *p; p++)
1284 printf_or_die("%s\n", *p);
1285 print_receiver_helps(d);
1286 print_filter_helps(d);
1287 print_writer_helps(d);
1288 exit(0);
1289 }
1290
1291 static void init_colors_or_die(void)
1292 {
1293 int i;
1294
1295 if (!want_colors())
1296 return;
1297 daemon_set_default_log_colors();
1298 daemon_set_flag(DF_COLOR_LOG);
1299 for (i = 0; i < conf.log_color_given; i++)
1300 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1301 }
1302
1303 /**
1304 * the main function of para_audiod
1305 *
1306 * \param argc usual argument count
1307 * \param argv usual argument vector
1308 *
1309 * \return EXIT_SUCCESS or EXIT_FAILURE
1310 *
1311 * \sa para_audiod(1)
1312 * */
1313 int main(int argc, char *argv[])
1314 {
1315 int ret, i;
1316 static struct sched s;
1317 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1318 struct audiod_cmdline_parser_params params = {
1319 .override = 0,
1320 .initialize = 1,
1321 .check_required = 0,
1322 .check_ambiguity = 0,
1323 .print_errors = 1
1324 };
1325
1326 valid_fd_012();
1327 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1328 exit(EXIT_FAILURE);
1329 HANDLE_VERSION_FLAG("audiod", conf);
1330 /* init receivers/filters/writers early to make help work */
1331 recv_init();
1332 filter_init();
1333 writer_init();
1334 if (conf.help_given || conf.detailed_help_given)
1335 print_help_and_die();
1336 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1337 parse_config_or_die();
1338 init_colors_or_die();
1339 init_random_seed_or_die();
1340 daemon_set_flag(DF_LOG_TIME);
1341 daemon_set_flag(DF_LOG_HOSTNAME);
1342 daemon_set_flag(DF_LOG_LL);
1343 if (conf.log_timing_given)
1344 daemon_set_flag(DF_LOG_TIMING);
1345 if (conf.logfile_given) {
1346 daemon_set_logfile(conf.logfile_arg);
1347 daemon_open_log_or_die();
1348 }
1349 ret = parse_stream_args();
1350 if (ret < 0) {
1351 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1352 exit(EXIT_FAILURE);
1353 }
1354 log_welcome("para_audiod");
1355 server_uptime(UPTIME_SET);
1356 set_initial_status();
1357 FOR_EACH_SLOT(i)
1358 clear_slot(i);
1359 setup_signal_handling();
1360 signal_setup_default(sig_task);
1361
1362 init_status_task(stat_task);
1363 init_command_task(cmd_task);
1364
1365 if (conf.daemon_given)
1366 daemonize();
1367
1368 register_task(&sig_task->task);
1369 register_task(&cmd_task->task);
1370 register_task(&stat_task->task);
1371 s.default_timeout.tv_sec = 2;
1372 s.default_timeout.tv_usec = 999 * 1000;
1373 ret = schedule(&s);
1374
1375 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1376 return EXIT_FAILURE;
1377 }