Merge branch 't/configure_improvements'
[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 <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 size_t min_iqs;
96 /** The offset value announced by para_server. */
97 int offset_seconds;
98 /** The length of the current audio file as announced by para_server. */
99 int length_seconds;
100 /** The start of the current stream from the view of para_server. */
101 struct timeval server_stream_start;
102 /** The average time deviation between para_server and para_audiod. */
103 struct timeval sa_time_diff;
104 /** Whether client time is ahead of server time. */
105 int sa_time_diff_sign;
106 /** The 'P' and the 'N' flags as announced by para_server. */
107 enum vss_status_flags vss_status;
108 /** Number of times the clock difference is to be checked. */
109 unsigned clock_diff_count;
110 /** When to start the next check for clock difference. */
111 struct timeval clock_diff_barrier;
112 /** Number of the audio format as announced by para_server. */
113 int current_audio_format_num;
114 /* The status task btrn is the child of the client task. */
115 struct btr_node *btrn;
116 };
117
118 /** The array of status items sent by para_server. */
119 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
120
121 /**
122 * the current mode of operation of which can be changed by the on/off/cycle
123 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
124 */
125 int audiod_status = AUDIOD_ON;
126
127 /**
128 * the gengetopt args_info struct that holds information on all command line
129 * arguments
130 */
131 struct audiod_args_info conf;
132
133 static char *socket_name;
134 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
135
136 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
137
138 static struct status_task status_task_struct;
139
140 /**
141 * the task that calls the status command of para_server
142 *
143 * \sa struct status_task
144 */
145 static struct status_task *stat_task = &status_task_struct;
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 *
165 * \param name The name of the audio format.
166 *
167 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
168 * \a name is not a supported audio format.
169 */
170 static int get_audio_format_num(const char *name)
171 {
172 int i;
173
174 while (para_isspace(*name))
175 name++;
176 FOR_EACH_AUDIO_FORMAT(i)
177 if (!strcmp(name, audio_formats[i]))
178 return i;
179 return -E_UNSUPPORTED_AUDIO_FORMAT;
180 }
181
182 /**
183 * Compute the play time based on information of the given slot.
184 *
185 * \param slot_num The slot number (negative means: no slot).
186 *
187 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
188 * from the status items received from para_server and the start time of the
189 * (first) writer of the given slot.
190 *
191 * It has to to take into account that probably the stream was not started at
192 * the beginning of the file, that the clock between the server and the client
193 * host may differ and that playback of the stream was delayed, e.g. because
194 * the prebuffer filter is used in the filter configuration of the given slot.
195 *
196 * If no writer is active in the given slot, or \a slot_num is negative
197 * (indicating that para_audiod runs in standby mode), an approximation based
198 * only on the status items is computed and the returned string is prefixed
199 * with "~".
200 *
201 * \return A string that must be freed by the caller.
202 */
203 char *get_time_string(int slot_num)
204 {
205 int ret, seconds = 0, length;
206 struct timeval *tmp, sum, sss, /* server stream start */
207 rstime, /* receiver start time */
208 wstime, /* writer start time */
209 wtime, /* now - writer start */
210 rskip; /* receiver start - sss */
211 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
212 char *msg;
213
214 if (audiod_status == AUDIOD_OFF)
215 goto empty;
216 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
217 if (stat_task->length_seconds) /* paused */
218 return NULL;
219 goto empty; /* stopped */
220 }
221 if (audiod_status == AUDIOD_ON && !s)
222 goto empty;
223 /*
224 * Valid status items and playing, set length and tmp to the stream
225 * start. We use the slot info and fall back to the info from current
226 * status items if no slot info is available.
227 */
228 length = stat_task->length_seconds;
229 tmp = &stat_task->server_stream_start;
230 if (s && s->wns) { /* writer active in this slot */
231 btr_get_node_start(s->wns[0].btrn, &wstime);
232 if (wstime.tv_sec != 0) { /* writer wrote something */
233 if (s->server_stream_start.tv_sec == 0) {
234 /* copy status info to slot */
235 s->server_stream_start = stat_task->server_stream_start;
236 s->offset_seconds = stat_task->offset_seconds;
237 s->seconds_total = stat_task->length_seconds;
238 }
239 length = s->seconds_total;
240 tmp = &s->server_stream_start;
241 }
242 }
243 if (stat_task->sa_time_diff_sign > 0)
244 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
245 else
246 tv_add(tmp, &stat_task->sa_time_diff, &sss);
247 if (!s || !s->wns) {
248 struct timeval diff;
249 tv_diff(now, &sss, &diff);
250 seconds = diff.tv_sec + stat_task->offset_seconds;
251 goto out;
252 }
253 tv_diff(now, &wstime, &wtime);
254 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
255 seconds = s->offset_seconds;
256 btr_get_node_start(s->receiver_node->btrn, &rstime);
257 ret = tv_diff(&rstime, &sss, &rskip);
258 if (ret > 0) { /* audiod was started in the middle of the stream */
259 tv_add(&wtime, &rskip, &sum);
260 seconds += sum.tv_sec;
261 } else
262 seconds += wtime.tv_sec;
263 out:
264 seconds = PARA_MIN(seconds, length);
265 seconds = PARA_MAX(seconds, 0);
266 msg = make_message(
267 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
268 s? "" : "~",
269 seconds / 60,
270 seconds % 60,
271 (length - seconds) / 60,
272 (length - seconds) % 60,
273 length? (seconds * 100 + length / 2) / length : 0,
274 length / 60,
275 length % 60
276 );
277 PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
278 return msg;
279 empty:
280 return para_strdup(NULL);
281 }
282
283 static int want_colors(void)
284 {
285 if (conf.color_arg == color_arg_no)
286 return 0;
287 if (conf.color_arg == color_arg_yes)
288 return 1;
289 if (conf.logfile_given)
290 return 0;
291 return isatty(STDERR_FILENO);
292 }
293
294 static void parse_config_or_die(void)
295 {
296 int ret;
297 char *config_file;
298 struct audiod_cmdline_parser_params params = {
299 .override = 0,
300 .initialize = 0,
301 .check_required = 1,
302 .check_ambiguity = 0,
303 .print_errors = 1
304 };
305
306 if (conf.config_file_given)
307 config_file = para_strdup(conf.config_file_arg);
308 else {
309 char *home = para_homedir();
310 config_file = make_message("%s/.paraslash/audiod.conf", home);
311 free(home);
312 }
313 ret = file_exists(config_file);
314 if (conf.config_file_given && !ret) {
315 PARA_EMERG_LOG("can not read config file %s\n", config_file);
316 goto err;
317 }
318 if (ret)
319 audiod_cmdline_parser_config_file(config_file, &conf, &params);
320 free(config_file);
321 daemon_set_loglevel(conf.loglevel_arg);
322 return;
323 err:
324 free(config_file);
325 exit(EXIT_FAILURE);
326 }
327
328 static void setup_signal_handling(void)
329 {
330 sig_task->fd = para_signal_init();
331 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
332 para_install_sighandler(SIGINT);
333 para_install_sighandler(SIGTERM);
334 para_install_sighandler(SIGHUP);
335 para_sigaction(SIGPIPE, SIG_IGN);
336 }
337
338 static void clear_slot(int slot_num)
339 {
340 struct slot_info *s = &slot[slot_num];
341
342 PARA_INFO_LOG("clearing slot %d\n", slot_num);
343 memset(s, 0, sizeof(struct slot_info));
344 s->format = -1;
345 }
346
347 static void close_receiver(int slot_num)
348 {
349 struct slot_info *s = &slot[slot_num];
350 struct audio_format_info *a;
351
352 if (s->format < 0 || !s->receiver_node)
353 return;
354 a = &afi[s->format];
355 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
356 audio_formats[s->format], slot_num);
357 a->receiver->close(s->receiver_node);
358 btr_free_node(s->receiver_node->btrn);
359 free(s->receiver_node);
360 s->receiver_node = NULL;
361 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
362 &a->restart_barrier);
363 }
364
365 static void writer_cleanup(struct writer_node *wn)
366 {
367 struct writer *w;
368
369 if (!wn)
370 return;
371 w = writers + wn->writer_num;
372 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
373 w->close(wn);
374 btr_free_node(wn->btrn);
375 }
376
377 static void close_writers(struct slot_info *s)
378 {
379 struct audio_format_info *a;
380 int i;
381
382 if (s->format < 0)
383 return;
384 assert(s->wns);
385 a = afi + s->format;
386 if (a->num_writers == 0)
387 writer_cleanup(s->wns);
388 else {
389 for (i = 0; i < a->num_writers; i++)
390 writer_cleanup(s->wns + i);
391 }
392 free(s->wns);
393 s->wns = NULL;
394 }
395
396 static void close_filters(struct slot_info *s)
397 {
398 int i;
399 struct audio_format_info *a = afi + s->format;
400 if (a->num_filters == 0)
401 return;
402 for (i = 0; i < a->num_filters; i++) {
403 struct filter_node *fn = s->fns + i;
404 struct filter *f;
405
406 if (!fn)
407 continue;
408 f = filters + fn->filter_num;
409 if (f->close)
410 f->close(fn);
411 btr_free_node(fn->btrn);
412 }
413 free(s->fns);
414 s->fns = NULL;
415 }
416
417 /*
418 * Whenever a task commits suicide by returning from post_select with t->error
419 * < 0, it also removes its btr node. We do exactly that to kill a running
420 * task. Note that the scheduler checks t->error also _before_ each pre/post
421 * select call, so the victim will never be scheduled again.
422 */
423 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
424 {
425 if (t->error < 0)
426 return;
427 t->error = error;
428 btr_remove_node(btrn);
429 }
430
431 static void kill_all_decoders(int error)
432 {
433 int i, j;
434
435 FOR_EACH_SLOT(i) {
436 struct slot_info *s = &slot[i];
437 struct audio_format_info *a;
438 if (s->format < 0)
439 continue;
440 a = afi + s->format;
441 if (s->wns)
442 for (j = 0; j < a->num_writers; j++)
443 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
444 if (s->fns)
445 for (j = 0; j < a->num_writers; j++)
446 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
447 if (s->receiver_node)
448 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
449 error);
450 }
451 }
452
453 static int get_empty_slot(void)
454 {
455 int i;
456 struct slot_info *s;
457
458 FOR_EACH_SLOT(i) {
459 s = &slot[i];
460 if (s->format < 0) {
461 clear_slot(i);
462 return i;
463 }
464 if (s->wns || s->receiver_node || s->fns)
465 continue;
466 clear_slot(i);
467 return i;
468 }
469 return -E_NO_MORE_SLOTS;
470 }
471
472 static void open_filters(struct slot_info *s)
473 {
474 struct audio_format_info *a = afi + s->format;
475 struct filter_node *fn;
476 int nf = a->num_filters;
477 struct btr_node *parent;
478 int i;
479
480 if (nf == 0)
481 return;
482 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
483 assert(s->fns == NULL);
484 s->fns = para_calloc(nf * sizeof(struct filter_node));
485 parent = s->receiver_node->btrn;
486 for (i = 0; i < nf; i++) {
487 struct filter *f = filters + a->filter_nums[i];
488 fn = s->fns + i;
489 fn->filter_num = a->filter_nums[i];
490 fn->conf = a->filter_conf[i];
491 fn->task.pre_select = f->pre_select;
492 fn->task.post_select = f->post_select;
493
494 fn->btrn = btr_new_node(&(struct btr_node_description)
495 EMBRACE(.name = f->name, .parent = parent,
496 .handler = f->execute, .context = fn));
497
498 f->open(fn);
499 register_task(&fn->task);
500 parent = fn->btrn;
501 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
502 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
503 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
504 }
505 }
506
507 static void open_writers(struct slot_info *s)
508 {
509 int i;
510 struct audio_format_info *a = afi + s->format;
511 struct writer_node *wn;
512 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
513
514 assert(s->wns == NULL);
515 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
516 * sizeof(struct writer_node));
517 if (a->num_writers == 0)
518 setup_writer_node(NULL, parent, s->wns);
519 else {
520 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
521 for (i = 0; i < a->num_writers; i++) {
522 wn = s->wns + i;
523 wn->conf = a->writer_conf[i];
524 wn->writer_num = a->writer_nums[i];
525 register_writer_node(wn, parent);
526 }
527 }
528 }
529
530 /* returns slot num on success */
531 static int open_receiver(int format)
532 {
533 struct audio_format_info *a = &afi[format];
534 struct slot_info *s;
535 int ret, slot_num;
536 struct receiver *r = a->receiver;
537 struct receiver_node *rn;
538
539 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
540 ret = get_empty_slot();
541 if (ret < 0)
542 return ret;
543 slot_num = ret;
544 rn = para_calloc(sizeof(*rn));
545 rn->receiver = r;
546 rn->conf = a->receiver_conf;
547 rn->btrn = btr_new_node(&(struct btr_node_description)
548 EMBRACE(.name = r->name, .context = rn));
549 ret = r->open(rn);
550 if (ret < 0) {
551 btr_free_node(rn->btrn);
552 free(rn);
553 return ret;
554 }
555 s = &slot[slot_num];
556 s->format = format;
557 s->receiver_node = rn;
558 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
559 audio_formats[format], r->name, slot_num);
560 rn->task.pre_select = r->pre_select;
561 rn->task.post_select = r->post_select;
562 sprintf(rn->task.status, "%s receiver node", r->name);
563 register_task(&rn->task);
564 return slot_num;
565 }
566
567 static bool receiver_running(void)
568 {
569 int i;
570 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
571
572 FOR_EACH_SLOT(i) {
573 struct slot_info *s = &slot[i];
574 long unsigned ss2 = s->server_stream_start.tv_sec;
575
576 if (!s->receiver_node)
577 continue;
578 if (s->receiver_node->task.error >= 0)
579 return true;
580 if (ss1 == ss2)
581 return true;
582 }
583 return false;
584 }
585
586 /**
587 * Return the root node of the current buffer tree.
588 *
589 * This is only used for stream grabbing.
590 *
591 * \return \p NULL if no slot is currently active. If more than one buffer tree
592 * exists, the node corresponding to the most recently started receiver is
593 * returned.
594 */
595 struct btr_node *audiod_get_btr_root(void)
596 {
597 int i, newest_slot = -1;
598 struct timeval newest_rstime = {0, 0};
599
600 FOR_EACH_SLOT(i) {
601 struct slot_info *s = &slot[i];
602 struct timeval rstime;
603 if (!s->receiver_node)
604 continue;
605 if (s->receiver_node->task.error < 0)
606 continue;
607 btr_get_node_start(s->receiver_node->btrn, &rstime);
608 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
609 continue;
610 newest_rstime = rstime;
611 newest_slot = i;
612 }
613 if (newest_slot == -1)
614 return NULL;
615 return slot[newest_slot].receiver_node->btrn;
616 }
617
618 /* whether a new instance of a decoder should be started. */
619 static bool must_start_decoder(void)
620 {
621 int cafn = stat_task->current_audio_format_num;
622 unsigned vs = stat_task->vss_status;
623
624 if (audiod_status != AUDIOD_ON)
625 return false;
626 if (cafn < 0)
627 return false;
628 if (!stat_task->ct)
629 return false;
630 if (vs & VSS_STATUS_FLAG_NEXT)
631 return false;
632 if (!(vs & VSS_STATUS_FLAG_PLAYING))
633 return false;
634 if (receiver_running())
635 return false;
636 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
637 return false;
638 return true;
639 }
640
641 static unsigned compute_time_diff(const struct timeval *status_time)
642 {
643 struct timeval tmp, diff;
644 static unsigned count;
645 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
646 const struct timeval max_deviation = {0, 500 * 1000};
647 const int time_smooth = 5;
648
649 if (!status_time)
650 return count;
651 sign = tv_diff(status_time, now, &diff);
652 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
653 // sign, sa_time_diff_sign);
654 if (!count) {
655 sa_time_diff_sign = sign;
656 stat_task->sa_time_diff = diff;
657 count++;
658 goto out;
659 }
660 if (count > 5) {
661 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
662 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
663 PARA_WARNING_LOG("time diff jump: %lims\n",
664 s * tv2ms(&tmp));
665 }
666 count++;
667 sa_time_diff_sign = tv_convex_combination(
668 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
669 count > 10? sign : sign * time_smooth, &diff,
670 &tmp);
671 stat_task->sa_time_diff = tmp;
672 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
673 sign < 0? "-" : "+",
674 tv2ms(&diff),
675 sa_time_diff_sign < 0? "-" : "+",
676 tv2ms(&stat_task->sa_time_diff)
677 );
678 out:
679 stat_task->sa_time_diff_sign = sa_time_diff_sign;
680 return count;
681 }
682
683 static int update_item(int itemnum, char *buf)
684 {
685 long unsigned sec, usec;
686
687 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
688 return 1;
689 free(stat_item_values[itemnum]);
690 stat_item_values[itemnum] = para_strdup(buf);
691 stat_client_write_item(itemnum);
692 switch (itemnum) {
693 case SI_STATUS_FLAGS:
694 stat_task->vss_status = 0;
695 if (strchr(buf, 'N'))
696 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
697 if (strchr(buf, 'P'))
698 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
699 break;
700 case SI_OFFSET:
701 stat_task->offset_seconds = atoi(buf);
702 break;
703 case SI_SECONDS_TOTAL:
704 stat_task->length_seconds = atoi(buf);
705 break;
706 case SI_STREAM_START:
707 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
708 stat_task->server_stream_start.tv_sec = sec;
709 stat_task->server_stream_start.tv_usec = usec;
710 }
711 break;
712 case SI_CURRENT_TIME:
713 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
714 struct timeval tv = {sec, usec};
715 compute_time_diff(&tv);
716 }
717 break;
718 case SI_FORMAT:
719 stat_task->current_audio_format_num
720 = get_audio_format_num(buf);
721 }
722 return 1;
723 }
724
725 static int parse_stream_command(const char *txt, char **cmd)
726 {
727 char *p = strchr(txt, ':');
728 int i;
729
730 if (!p)
731 return -E_MISSING_COLON;
732 p++;
733 FOR_EACH_AUDIO_FORMAT(i) {
734 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
735 continue;
736 *cmd = p;
737 return i;
738 }
739 return -E_UNSUPPORTED_AUDIO_FORMAT;
740 }
741
742 static int add_filter(int format, char *cmdline)
743 {
744 struct audio_format_info *a = &afi[format];
745 int filter_num, nf = a->num_filters;
746
747 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
748 if (filter_num < 0)
749 return filter_num;
750 a->filter_nums[nf] = filter_num;
751 a->num_filters++;
752 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
753 filters[filter_num].name);
754 return filter_num;
755 }
756
757 static int parse_writer_args(void)
758 {
759 int i, ret, nw;
760 char *cmd;
761 struct audio_format_info *a;
762
763 nw = PARA_MAX(1U, conf.writer_given);
764 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
765 FOR_EACH_AUDIO_FORMAT(i) {
766 a = &afi[i];
767 a->writer_conf = para_malloc(nw * sizeof(void *));
768 a->writer_nums = para_malloc(nw * sizeof(int));
769 a->num_writers = 0;
770 }
771 for (i = 0; i < conf.writer_given; i++) {
772 void *wconf;
773 int writer_num;
774 ret = parse_stream_command(conf.writer_arg[i], &cmd);
775 if (ret < 0)
776 goto out;
777 a = &afi[ret];
778 nw = a->num_writers;
779 wconf = check_writer_arg(cmd, &writer_num);
780 if (!wconf) {
781 ret = writer_num;
782 goto out;
783 }
784 a->writer_nums[nw] = writer_num;
785 a->writer_conf[nw] = wconf;
786 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
787 nw, writer_names[writer_num]);
788 a->num_writers++;
789 }
790 ret = 1;
791 out:
792 return ret;
793 }
794
795 static int parse_receiver_args(void)
796 {
797 int i, ret, receiver_num;
798 char *cmd = NULL;
799 struct audio_format_info *a;
800
801 for (i = conf.receiver_given - 1; i >= 0; i--) {
802 char *arg = conf.receiver_arg[i];
803 char *recv_arg = strchr(arg, ':');
804 ret = -E_MISSING_COLON;
805 if (!recv_arg)
806 goto out;
807 *recv_arg = '\0';
808 recv_arg++;
809 ret = get_audio_format_num(arg);
810 if (ret < 0)
811 goto out;
812 /*
813 * If multiple receivers are given for this audio format, the
814 * last one wins and we have to free the previous receiver
815 * config here. Since we are iterating backwards, the winning
816 * receiver arg is in fact the first one given.
817 */
818 if (afi[ret].receiver_conf)
819 afi[ret].receiver->free_config(afi[ret].receiver_conf);
820 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
821 if (!afi[ret].receiver_conf) {
822 ret = -E_RECV_SYNTAX;
823 goto out;
824 }
825 afi[ret].receiver = &receivers[receiver_num];
826 }
827 /*
828 * Use the first available receiver with no arguments for those audio
829 * formats for which no receiver was specified.
830 */
831 cmd = para_strdup(receivers[0].name);
832 FOR_EACH_AUDIO_FORMAT(i) {
833 a = &afi[i];
834 if (a->receiver_conf)
835 continue;
836 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
837 if (!a->receiver_conf)
838 return -E_RECV_SYNTAX;
839 a->receiver = &receivers[receiver_num];
840 }
841 ret = 1;
842 out:
843 free(cmd);
844 return ret;
845 }
846
847 static int init_default_filters(void)
848 {
849 int i, ret = 1;
850
851 FOR_EACH_AUDIO_FORMAT(i) {
852 struct audio_format_info *a = &afi[i];
853 char *tmp;
854 int j;
855
856 if (a->num_filters)
857 continue; /* no default -- nothing to to */
858 /*
859 * If udp is used to receive this audiod format, add fecdec as
860 * the first filter.
861 */
862 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
863 strcmp(afi[i].receiver->name, "dccp") == 0) {
864 tmp = para_strdup("fecdec");
865 add_filter(i, tmp);
866 free(tmp);
867 if (ret < 0)
868 goto out;
869 }
870 /* add "dec" to audio format name */
871 tmp = make_message("%sdec", audio_formats[i]);
872 for (j = 0; filters[j].name; j++)
873 if (!strcmp(tmp, filters[j].name))
874 break;
875 free(tmp);
876 ret = -E_UNSUPPORTED_FILTER;
877 if (!filters[j].name)
878 goto out;
879 tmp = para_strdup(filters[j].name);
880 ret = add_filter(i, tmp);
881 free(tmp);
882 if (ret < 0)
883 goto out;
884 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
885 filters[j].name);
886 }
887 out:
888 return ret;
889 }
890
891 static int parse_filter_args(void)
892 {
893 int i, ret, nf;
894
895 nf = PARA_MAX(2U, conf.filter_given);
896 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
897 FOR_EACH_AUDIO_FORMAT(i) {
898 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
899 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
900 }
901 if (!conf.no_default_filters_given)
902 return init_default_filters();
903 for (i = 0; i < conf.filter_given; i++) {
904 char *arg = conf.filter_arg[i];
905 char *filter_name = strchr(arg, ':');
906 ret = -E_MISSING_COLON;
907 if (!filter_name)
908 goto out;
909 *filter_name = '\0';
910 filter_name++;
911 ret = get_audio_format_num(arg);
912 if (ret < 0)
913 goto out;
914 ret = add_filter(ret, filter_name);
915 if (ret < 0)
916 goto out;
917 }
918 ret = init_default_filters(); /* use default values for the rest */
919 out:
920 return ret;
921 }
922
923 static int parse_stream_args(void)
924 {
925 int ret;
926
927 ret = parse_receiver_args();
928 if (ret < 0)
929 return ret;
930 ret = parse_filter_args();
931 if (ret < 0)
932 return ret;
933 ret = parse_writer_args();
934 if (ret < 0)
935 return ret;
936 return 1;
937 }
938
939 /* does not unlink socket on errors */
940 static int audiod_get_socket(void)
941 {
942 struct sockaddr_un unix_addr;
943 int ret, fd;
944
945 if (conf.socket_given)
946 socket_name = para_strdup(conf.socket_arg);
947 else {
948 char *hn = para_hostname();
949 socket_name = make_message("/var/paraslash/audiod_socket.%s",
950 hn);
951 free(hn);
952 }
953 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
954 if (conf.force_given)
955 unlink(socket_name);
956 ret = create_local_socket(socket_name, &unix_addr,
957 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
958 if (ret < 0)
959 goto err;
960 fd = ret;
961 if (listen(fd , 5) < 0) {
962 ret = -ERRNO_TO_PARA_ERROR(errno);
963 goto err;
964 }
965 ret = mark_fd_nonblocking(fd);
966 if (ret < 0)
967 goto err;
968 return fd;
969 err:
970 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
971 exit(EXIT_FAILURE);
972 }
973
974 static void signal_pre_select(struct sched *s, struct task *t)
975 {
976 struct signal_task *st = container_of(t, struct signal_task, task);
977 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
978 }
979
980 static void signal_post_select(struct sched *s, __a_unused struct task *t)
981 {
982 int signum;
983
984 signum = para_next_signal(&s->rfds);
985 switch (signum) {
986 case SIGINT:
987 case SIGTERM:
988 case SIGHUP:
989 PARA_EMERG_LOG("terminating on signal %d\n", signum);
990 clean_exit(EXIT_FAILURE, "caught deadly signal");
991 }
992 }
993
994 static void signal_setup_default(struct signal_task *st)
995 {
996 st->task.pre_select = signal_pre_select;
997 st->task.post_select = signal_post_select;
998 sprintf(st->task.status, "signal task");
999 }
1000
1001 static void command_pre_select(struct sched *s, struct task *t)
1002 {
1003 struct command_task *ct = container_of(t, struct command_task, task);
1004 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1005 }
1006
1007 static void command_post_select(struct sched *s, struct task *t)
1008 {
1009 int ret;
1010 struct command_task *ct = container_of(t, struct command_task, task);
1011 static struct timeval last_status_dump;
1012 struct timeval tmp, delay = {0, 500 * 1000};
1013
1014 tv_add(&last_status_dump, &delay, &tmp);
1015 if (tv_diff(&tmp, now, NULL) < 0) {
1016 audiod_status_dump();
1017 last_status_dump = *now;
1018 }
1019
1020 ret = handle_connect(ct->fd, &s->rfds);
1021 if (ret < 0)
1022 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1023 audiod_status_dump();
1024 }
1025
1026 static void init_command_task(struct command_task *ct)
1027 {
1028 ct->task.pre_select = command_pre_select;
1029 ct->task.post_select = command_post_select;
1030 ct->task.error = 0;
1031 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1032 sprintf(ct->task.status, "command task");
1033 }
1034
1035 static void close_stat_pipe(void)
1036 {
1037 if (!stat_task->ct)
1038 return;
1039 btr_free_node(stat_task->ct->btrn);
1040 client_close(stat_task->ct);
1041 stat_task->ct = NULL;
1042 clear_and_dump_items();
1043 stat_task->length_seconds = 0;
1044 stat_task->offset_seconds = 0;
1045 stat_task->vss_status = 0;
1046 stat_task->current_audio_format_num = -1;
1047 audiod_status_dump();
1048 }
1049
1050 /**
1051 * close the connection to para_server and exit
1052 *
1053 * \param status the exit status which is passed to exit(3)
1054 * \param msg the log message
1055 *
1056 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1057 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1058 * EXIT_FAILURE.
1059 *
1060 * \sa exit(3)
1061 */
1062 void __noreturn clean_exit(int status, const char *msg)
1063 {
1064 PARA_EMERG_LOG("%s\n", msg);
1065 if (socket_name)
1066 unlink(socket_name);
1067 close_stat_pipe();
1068 exit(status);
1069 }
1070
1071 /* avoid busy loop if server is down */
1072 static void set_stat_task_restart_barrier(unsigned seconds)
1073 {
1074 struct timeval delay = {seconds, 0};
1075 tv_add(now, &delay, &stat_task->restart_barrier);
1076 }
1077
1078 static void try_to_close_slot(int slot_num)
1079 {
1080 struct slot_info *s = &slot[slot_num];
1081 struct audio_format_info *a = afi + s->format;
1082 int i;
1083
1084 if (s->format < 0)
1085 return;
1086 if (s->receiver_node && s->receiver_node->task.error >= 0)
1087 return;
1088 for (i = 0; i < a->num_filters; i++)
1089 if (s->fns && s->fns[i].task.error >= 0)
1090 return;
1091 if (a->num_writers > 0) {
1092 for (i = 0; i < a->num_writers; i++)
1093 if (s->wns && s->wns[i].task.error >= 0)
1094 return;
1095 } else {
1096 if (s->wns && s->wns[0].task.error >= 0)
1097 return;
1098 }
1099 PARA_INFO_LOG("closing slot %d\n", slot_num);
1100 close_writers(s);
1101 close_filters(s);
1102 close_receiver(slot_num);
1103 clear_slot(slot_num);
1104 }
1105
1106 /*
1107 * Check if any receivers/filters/writers need to be started and do so if
1108 * necessary.
1109 */
1110 static void start_stop_decoders(void)
1111 {
1112 int i, ret;
1113 struct slot_info *sl;
1114 struct audio_format_info *a;
1115
1116 FOR_EACH_SLOT(i)
1117 try_to_close_slot(i);
1118 if (audiod_status != AUDIOD_ON ||
1119 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1120 return kill_all_decoders(-E_NOT_PLAYING);
1121 if (!must_start_decoder())
1122 return;
1123 ret = open_receiver(stat_task->current_audio_format_num);
1124 if (ret < 0) {
1125 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1126 return;
1127 }
1128 sl = slot + ret;
1129 a = afi + sl->format;
1130 if (a->num_filters)
1131 open_filters(sl);
1132 open_writers(sl);
1133 activate_grab_clients();
1134 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1135 }
1136
1137 static void status_pre_select(struct sched *s, struct task *t)
1138 {
1139 struct status_task *st = container_of(t, struct status_task, task);
1140 int ret, cafn = stat_task->current_audio_format_num;
1141
1142 if (must_start_decoder())
1143 goto min_delay;
1144 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1145 if (ret > 0)
1146 goto min_delay;
1147 if (st->ct && audiod_status == AUDIOD_OFF)
1148 goto min_delay;
1149 if (!st->ct && audiod_status != AUDIOD_OFF)
1150 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1151 if (cafn >= 0)
1152 sched_request_barrier(&afi[cafn].restart_barrier, s);
1153 /*
1154 * If para_server is playing we'd like to have a smooth time display
1155 * even if we are running in standby mode. So we request a timeout that
1156 * expires at the next full second.
1157 */
1158 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1159 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1160 return;
1161 min_delay:
1162 sched_min_delay(s);
1163 }
1164
1165 /* restart the client task if necessary */
1166 static void status_post_select(__a_unused struct sched *s, struct task *t)
1167 {
1168 struct status_task *st = container_of(t, struct status_task, task);
1169
1170 if (audiod_status == AUDIOD_OFF) {
1171 if (!st->ct)
1172 goto out;
1173 if (st->ct->task.error >= 0) {
1174 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1175 goto out;
1176 }
1177 if (st->ct->task.error >= 0)
1178 goto out;
1179 close_stat_pipe();
1180 st->clock_diff_count = conf.clock_diff_count_arg;
1181 goto out;
1182 }
1183 if (st->ct) {
1184 char *buf;
1185 size_t sz;
1186 int ret;
1187 if (st->ct->task.error < 0) {
1188 if (st->ct->task.error >= 0)
1189 goto out;
1190 close_stat_pipe();
1191 goto out;
1192 }
1193 if (st->ct->status != CL_RECEIVING)
1194 goto out;
1195 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1196 if (ret <= 0) {
1197 struct timeval diff;
1198 tv_diff(now, &st->last_status_read, &diff);
1199 if (diff.tv_sec > 61)
1200 kill_btrn(st->ct->btrn, &st->ct->task,
1201 -E_STATUS_TIMEOUT);
1202 goto out;
1203 }
1204 btr_merge(st->btrn, st->min_iqs);
1205 sz = btr_next_buffer(st->btrn, &buf);
1206 ret = for_each_stat_item(buf, sz, update_item);
1207 if (ret < 0) {
1208 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1209 goto out;
1210 }
1211 if (sz != ret) {
1212 btr_consume(st->btrn, sz - ret);
1213 st->last_status_read = *now;
1214 st->min_iqs = 0;
1215 } else /* current status item crosses buffers */
1216 st->min_iqs = sz + 1;
1217 goto out;
1218 }
1219 btr_drain(st->btrn);
1220 st->current_audio_format_num = -1;
1221 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1222 goto out;
1223 if (st->clock_diff_count) { /* get status only one time */
1224 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1225 int argc = 5;
1226 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1227 st->clock_diff_count--;
1228 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1229 set_stat_task_restart_barrier(2);
1230
1231 } else {
1232 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1233 int argc = 4;
1234 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1235 set_stat_task_restart_barrier(5);
1236 }
1237 free(stat_item_values[SI_BASENAME]);
1238 stat_item_values[SI_BASENAME] = para_strdup(
1239 "no connection to para_server");
1240 stat_client_write_item(SI_BASENAME);
1241 st->last_status_read = *now;
1242 out:
1243 start_stop_decoders();
1244 }
1245
1246 static void init_status_task(struct status_task *st)
1247 {
1248 memset(st, 0, sizeof(struct status_task));
1249 st->task.pre_select = status_pre_select;
1250 st->task.post_select = status_post_select;
1251 st->sa_time_diff_sign = 1;
1252 st->clock_diff_count = conf.clock_diff_count_arg;
1253 st->current_audio_format_num = -1;
1254 sprintf(st->task.status, "stat");
1255 st->btrn = btr_new_node(&(struct btr_node_description)
1256 EMBRACE(.name = "stat"));
1257 }
1258
1259 static void set_initial_status(void)
1260 {
1261 audiod_status = AUDIOD_ON;
1262 if (!conf.mode_given)
1263 return;
1264 if (!strcmp(conf.mode_arg, "sb")) {
1265 audiod_status = AUDIOD_STANDBY;
1266 return;
1267 }
1268 if (!strcmp(conf.mode_arg, "off")) {
1269 audiod_status = AUDIOD_OFF;
1270 return;
1271 }
1272 if (strcmp(conf.mode_arg, "on"))
1273 PARA_WARNING_LOG("invalid mode\n");
1274 }
1275
1276 __noreturn static void print_help_and_die(void)
1277 {
1278 int d = conf.detailed_help_given;
1279 const char **p = d? audiod_args_info_detailed_help
1280 : audiod_args_info_help;
1281
1282 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1283 AUDIOD_CMDLINE_PARSER_VERSION);
1284 printf_or_die("%s\n\n", audiod_args_info_usage);
1285 for (; *p; p++)
1286 printf_or_die("%s\n", *p);
1287 print_receiver_helps(d);
1288 print_filter_helps(d);
1289 print_writer_helps(d);
1290 exit(0);
1291 }
1292
1293 static void init_colors_or_die(void)
1294 {
1295 int i;
1296
1297 if (!want_colors())
1298 return;
1299 daemon_set_default_log_colors();
1300 daemon_set_flag(DF_COLOR_LOG);
1301 for (i = 0; i < conf.log_color_given; i++)
1302 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1303 }
1304
1305 /**
1306 * the main function of para_audiod
1307 *
1308 * \param argc usual argument count
1309 * \param argv usual argument vector
1310 *
1311 * \return EXIT_SUCCESS or EXIT_FAILURE
1312 *
1313 * \sa para_audiod(1)
1314 * */
1315 int main(int argc, char *argv[])
1316 {
1317 int ret, i;
1318 static struct sched s;
1319 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1320 struct audiod_cmdline_parser_params params = {
1321 .override = 0,
1322 .initialize = 1,
1323 .check_required = 0,
1324 .check_ambiguity = 0,
1325 .print_errors = 1
1326 };
1327
1328 valid_fd_012();
1329 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1330 exit(EXIT_FAILURE);
1331 HANDLE_VERSION_FLAG("audiod", conf);
1332 /* init receivers/filters/writers early to make help work */
1333 recv_init();
1334 filter_init();
1335 writer_init();
1336 if (conf.help_given || conf.detailed_help_given)
1337 print_help_and_die();
1338 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1339 parse_config_or_die();
1340 init_colors_or_die();
1341 init_random_seed_or_die();
1342 daemon_set_flag(DF_LOG_TIME);
1343 daemon_set_flag(DF_LOG_HOSTNAME);
1344 daemon_set_flag(DF_LOG_LL);
1345 if (conf.log_timing_given)
1346 daemon_set_flag(DF_LOG_TIMING);
1347 if (conf.logfile_given) {
1348 daemon_set_logfile(conf.logfile_arg);
1349 daemon_open_log_or_die();
1350 }
1351 ret = parse_stream_args();
1352 if (ret < 0) {
1353 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1354 exit(EXIT_FAILURE);
1355 }
1356 log_welcome("para_audiod");
1357 server_uptime(UPTIME_SET);
1358 set_initial_status();
1359 FOR_EACH_SLOT(i)
1360 clear_slot(i);
1361 setup_signal_handling();
1362 signal_setup_default(sig_task);
1363
1364 init_status_task(stat_task);
1365 init_command_task(cmd_task);
1366
1367 if (conf.daemon_given)
1368 daemonize();
1369
1370 register_task(&sig_task->task);
1371 register_task(&cmd_task->task);
1372 register_task(&stat_task->task);
1373 s.default_timeout.tv_sec = 2;
1374 s.default_timeout.tv_usec = 999 * 1000;
1375 ret = schedule(&s);
1376
1377 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1378 return EXIT_FAILURE;
1379 }