8dd69c60910a725999b193c3e254df9f9c69c2a3
[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 #include "version.h"
37
38 /** define the array of error lists needed by para_audiod */
39 INIT_AUDIOD_ERRLISTS;
40 /** define the array containing all supported audio formats */
41 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
42
43 /** Defines how audiod handles one supported audio format. */
44 struct audio_format_info {
45 /** pointer to the receiver for this audio format */
46 struct receiver *receiver;
47 /** the receiver configuration */
48 void *receiver_conf;
49 /** the number of filters that should be activated for this audio format */
50 unsigned int num_filters;
51 /** Array of filter numbers to be activated. */
52 unsigned *filter_nums;
53 /** Pointer to the array of filter configurations. */
54 void **filter_conf;
55 /** the number of filters that should be activated for this audio format */
56 unsigned int num_writers;
57 /** Array of writer numbers to be activated. */
58 int *writer_nums;
59 /** pointer to the array of writer configurations */
60 void **writer_conf;
61 /** do not start receiver/filters/writer before this time */
62 struct timeval restart_barrier;
63 };
64
65 /**
66 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
67 * be associated with a receiver/filter/writer triple. This array holds all
68 * information on the status of these slots.
69 *
70 * \sa struct slot_info
71 * */
72 struct slot_info slot[MAX_STREAM_SLOTS];
73
74 /** The vss status flags audiod is interested in. */
75 enum vss_status_flags {
76 /** Whether the 'N' flag is set. */
77 VSS_STATUS_FLAG_NEXT = 1,
78 /** The 'P' flag is set. */
79 VSS_STATUS_FLAG_PLAYING = 2,
80 };
81
82 /**
83 * The task for obtaining para_server's status (para_client stat).
84 *
85 * \sa struct task, struct sched.
86 */
87 struct status_task {
88 /** The associated task structure of audiod. */
89 struct task task;
90 /** Client data associated with the stat task. */
91 struct client_task *ct;
92 /** Do not restart client command until this time. */
93 struct timeval restart_barrier;
94 /** Last time we received status data from para_server. */
95 struct timeval last_status_read;
96 size_t min_iqs;
97 /** The offset value announced by para_server. */
98 int offset_seconds;
99 /** The length of the current audio file as announced by para_server. */
100 int length_seconds;
101 /** The start of the current stream from the view of para_server. */
102 struct timeval server_stream_start;
103 /** The average time deviation between para_server and para_audiod. */
104 struct timeval sa_time_diff;
105 /** Whether client time is ahead of server time. */
106 int sa_time_diff_sign;
107 /** The 'P' and the 'N' flags as announced by para_server. */
108 enum vss_status_flags vss_status;
109 /** Number of times the clock difference is to be checked. */
110 unsigned clock_diff_count;
111 /** When to start the next check for clock difference. */
112 struct timeval clock_diff_barrier;
113 /** Number of the audio format as announced by para_server. */
114 int current_audio_format_num;
115 /* The status task btrn is the child of the client task. */
116 struct btr_node *btrn;
117 };
118
119 /** The array of status items sent by para_server. */
120 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
121
122 /**
123 * the current mode of operation of which can be changed by the on/off/cycle
124 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
125 */
126 int audiod_status = AUDIOD_ON;
127
128 /**
129 * the gengetopt args_info struct that holds information on all command line
130 * arguments
131 */
132 struct audiod_args_info conf;
133
134 static char *socket_name;
135 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
136
137 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
138
139 static struct status_task status_task_struct;
140
141 /**
142 * the task that calls the status command of para_server
143 *
144 * \sa struct status_task
145 */
146 static struct status_task *stat_task = &status_task_struct;
147
148 /**
149 * the task for handling audiod commands
150 *
151 * \sa struct task, struct sched
152 */
153 struct command_task {
154 /** the local listening socket */
155 int fd;
156 /** the associated task structure */
157 struct task task;
158 };
159
160 /** iterate over all supported audio formats */
161 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
162
163 /**
164 * Get the audio format number.
165 *
166 * \param name The name of the audio format.
167 *
168 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
169 * \a name is not a supported audio format.
170 */
171 int get_audio_format_num(const char *name)
172 {
173 int i;
174
175 while (para_isspace(*name))
176 name++;
177 FOR_EACH_AUDIO_FORMAT(i)
178 if (!strcmp(name, audio_formats[i]))
179 return i;
180 return -E_UNSUPPORTED_AUDIO_FORMAT;
181 }
182
183 /**
184 * Compute the play time based on information of the given slot.
185 *
186 * \param slot_num The slot number (negative means: no slot).
187 *
188 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
189 * from the status items received from para_server and the start time of the
190 * (first) writer of the given slot.
191 *
192 * It has to to take into account that probably the stream was not started at
193 * the beginning of the file, that the clock between the server and the client
194 * host may differ and that playback of the stream was delayed, e.g. because
195 * the prebuffer filter is used in the filter configuration of the given slot.
196 *
197 * If no writer is active in the given slot, or \a slot_num is negative
198 * (indicating that para_audiod runs in standby mode), an approximation based
199 * only on the status items is computed and the returned string is prefixed
200 * with "~".
201 *
202 * \return A string that must be freed by the caller.
203 */
204 char *get_time_string(int slot_num)
205 {
206 int ret, seconds = 0, length;
207 struct timeval *tmp, sum, sss, /* server stream start */
208 rstime, /* receiver start time */
209 wstime, /* writer start time */
210 wtime, /* now - writer start */
211 rskip; /* receiver start - sss */
212 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
213 char *msg;
214
215 if (audiod_status == AUDIOD_OFF)
216 goto empty;
217 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
218 if (stat_task->length_seconds) /* paused */
219 return NULL;
220 goto empty; /* stopped */
221 }
222 if (audiod_status == AUDIOD_ON && !s)
223 goto empty;
224 /*
225 * Valid status items and playing, set length and tmp to the stream
226 * start. We use the slot info and fall back to the info from current
227 * status items if no slot info is available.
228 */
229 length = stat_task->length_seconds;
230 tmp = &stat_task->server_stream_start;
231 if (s && s->wns) { /* writer active in this slot */
232 btr_get_node_start(s->wns[0].btrn, &wstime);
233 if (wstime.tv_sec != 0) { /* writer wrote something */
234 if (s->server_stream_start.tv_sec == 0) {
235 /* copy status info to slot */
236 s->server_stream_start = stat_task->server_stream_start;
237 s->offset_seconds = stat_task->offset_seconds;
238 s->seconds_total = stat_task->length_seconds;
239 }
240 length = s->seconds_total;
241 tmp = &s->server_stream_start;
242 }
243 }
244 if (stat_task->sa_time_diff_sign > 0)
245 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
246 else
247 tv_add(tmp, &stat_task->sa_time_diff, &sss);
248 if (!s || !s->wns) {
249 struct timeval diff;
250 tv_diff(now, &sss, &diff);
251 seconds = diff.tv_sec + stat_task->offset_seconds;
252 goto out;
253 }
254 tv_diff(now, &wstime, &wtime);
255 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
256 seconds = s->offset_seconds;
257 btr_get_node_start(s->receiver_node->btrn, &rstime);
258 ret = tv_diff(&rstime, &sss, &rskip);
259 if (ret > 0) { /* audiod was started in the middle of the stream */
260 tv_add(&wtime, &rskip, &sum);
261 seconds += sum.tv_sec;
262 } else
263 seconds += wtime.tv_sec;
264 out:
265 seconds = PARA_MIN(seconds, length);
266 seconds = PARA_MAX(seconds, 0);
267 msg = make_message(
268 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
269 s? "" : "~",
270 seconds / 60,
271 seconds % 60,
272 (length - seconds) / 60,
273 (length - seconds) % 60,
274 length? (seconds * 100 + length / 2) / length : 0,
275 length / 60,
276 length % 60
277 );
278 PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
279 return msg;
280 empty:
281 return para_strdup(NULL);
282 }
283
284 static int want_colors(void)
285 {
286 if (conf.color_arg == color_arg_no)
287 return 0;
288 if (conf.color_arg == color_arg_yes)
289 return 1;
290 if (conf.logfile_given)
291 return 0;
292 return isatty(STDERR_FILENO);
293 }
294
295 static void parse_config_or_die(void)
296 {
297 int ret;
298 char *config_file;
299 struct audiod_cmdline_parser_params params = {
300 .override = 0,
301 .initialize = 0,
302 .check_required = 1,
303 .check_ambiguity = 0,
304 .print_errors = 1
305 };
306
307 if (conf.config_file_given)
308 config_file = para_strdup(conf.config_file_arg);
309 else {
310 char *home = para_homedir();
311 config_file = make_message("%s/.paraslash/audiod.conf", home);
312 free(home);
313 }
314 ret = file_exists(config_file);
315 if (conf.config_file_given && !ret) {
316 PARA_EMERG_LOG("can not read config file %s\n", config_file);
317 goto err;
318 }
319 if (ret)
320 audiod_cmdline_parser_config_file(config_file, &conf, &params);
321 free(config_file);
322 daemon_set_loglevel(conf.loglevel_arg);
323 return;
324 err:
325 free(config_file);
326 exit(EXIT_FAILURE);
327 }
328
329 static void setup_signal_handling(void)
330 {
331 sig_task->fd = para_signal_init();
332 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
333 para_install_sighandler(SIGINT);
334 para_install_sighandler(SIGTERM);
335 para_install_sighandler(SIGHUP);
336 para_sigaction(SIGPIPE, SIG_IGN);
337 }
338
339 static void clear_slot(int slot_num)
340 {
341 struct slot_info *s = &slot[slot_num];
342
343 PARA_INFO_LOG("clearing slot %d\n", slot_num);
344 memset(s, 0, sizeof(struct slot_info));
345 s->format = -1;
346 }
347
348 static void close_receiver(int slot_num)
349 {
350 struct slot_info *s = &slot[slot_num];
351 struct audio_format_info *a;
352
353 if (s->format < 0 || !s->receiver_node)
354 return;
355 a = &afi[s->format];
356 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
357 audio_formats[s->format], slot_num);
358 a->receiver->close(s->receiver_node);
359 btr_free_node(s->receiver_node->btrn);
360 free(s->receiver_node);
361 s->receiver_node = NULL;
362 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
363 &a->restart_barrier);
364 }
365
366 static void writer_cleanup(struct writer_node *wn)
367 {
368 struct writer *w;
369
370 if (!wn)
371 return;
372 w = writers + wn->writer_num;
373 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
374 w->close(wn);
375 btr_free_node(wn->btrn);
376 }
377
378 static void close_writers(struct slot_info *s)
379 {
380 struct audio_format_info *a;
381 int i;
382
383 if (s->format < 0)
384 return;
385 assert(s->wns);
386 a = afi + s->format;
387 if (a->num_writers == 0)
388 writer_cleanup(s->wns);
389 else {
390 for (i = 0; i < a->num_writers; i++)
391 writer_cleanup(s->wns + i);
392 }
393 free(s->wns);
394 s->wns = NULL;
395 }
396
397 static void close_filters(struct slot_info *s)
398 {
399 int i;
400 struct audio_format_info *a = afi + s->format;
401 if (a->num_filters == 0)
402 return;
403 for (i = 0; i < a->num_filters; i++) {
404 struct filter_node *fn = s->fns + i;
405 struct filter *f;
406
407 if (!fn)
408 continue;
409 f = filters + fn->filter_num;
410 if (f->close)
411 f->close(fn);
412 btr_free_node(fn->btrn);
413 }
414 free(s->fns);
415 s->fns = NULL;
416 }
417
418 /*
419 * Whenever a task commits suicide by returning from post_select with t->error
420 * < 0, it also removes its btr node. We do exactly that to kill a running
421 * task. Note that the scheduler checks t->error also _before_ each pre/post
422 * select call, so the victim will never be scheduled again.
423 */
424 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
425 {
426 if (t->error < 0)
427 return;
428 t->error = error;
429 btr_remove_node(btrn);
430 }
431
432 static void kill_all_decoders(int error)
433 {
434 int i, j;
435
436 FOR_EACH_SLOT(i) {
437 struct slot_info *s = &slot[i];
438 struct audio_format_info *a;
439 if (s->format < 0)
440 continue;
441 a = afi + s->format;
442 if (s->wns)
443 for (j = 0; j < a->num_writers; j++)
444 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
445 if (s->fns)
446 for (j = 0; j < a->num_writers; j++)
447 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
448 if (s->receiver_node)
449 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
450 error);
451 }
452 }
453
454 static int get_empty_slot(void)
455 {
456 int i;
457 struct slot_info *s;
458
459 FOR_EACH_SLOT(i) {
460 s = &slot[i];
461 if (s->format < 0) {
462 clear_slot(i);
463 return i;
464 }
465 if (s->wns || s->receiver_node || s->fns)
466 continue;
467 clear_slot(i);
468 return i;
469 }
470 return -E_NO_MORE_SLOTS;
471 }
472
473 /**
474 * get the number of filters
475 *
476 * \param audio_format_num the number identifying the audio format
477 *
478 * \return the number of filters for the given audio format
479 *
480 * \sa struct filter;
481 */
482 int num_filters(int audio_format_num)
483 {
484 return afi[audio_format_num].num_filters;
485 }
486
487 static void open_filters(struct slot_info *s)
488 {
489 struct audio_format_info *a = afi + s->format;
490 struct filter_node *fn;
491 int nf = a->num_filters;
492 struct btr_node *parent;
493 int i;
494
495 if (nf == 0)
496 return;
497 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
498 assert(s->fns == NULL);
499 s->fns = para_calloc(nf * sizeof(struct filter_node));
500 parent = s->receiver_node->btrn;
501 for (i = 0; i < nf; i++) {
502 struct filter *f = filters + a->filter_nums[i];
503 fn = s->fns + i;
504 fn->filter_num = a->filter_nums[i];
505 fn->conf = a->filter_conf[i];
506 fn->task.pre_select = f->pre_select;
507 fn->task.post_select = f->post_select;
508
509 fn->btrn = btr_new_node(&(struct btr_node_description)
510 EMBRACE(.name = f->name, .parent = parent,
511 .handler = f->execute, .context = fn));
512
513 f->open(fn);
514 register_task(&fn->task);
515 parent = fn->btrn;
516 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
517 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
518 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
519 }
520 }
521
522 static void open_writers(struct slot_info *s)
523 {
524 int i;
525 struct audio_format_info *a = afi + s->format;
526 struct writer_node *wn;
527 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
528
529 assert(s->wns == NULL);
530 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
531 * sizeof(struct writer_node));
532 if (a->num_writers == 0)
533 setup_writer_node(NULL, parent, s->wns);
534 else {
535 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
536 for (i = 0; i < a->num_writers; i++) {
537 wn = s->wns + i;
538 wn->conf = a->writer_conf[i];
539 wn->writer_num = a->writer_nums[i];
540 register_writer_node(wn, parent);
541 }
542 }
543 }
544
545 /* returns slot num on success */
546 static int open_receiver(int format)
547 {
548 struct audio_format_info *a = &afi[format];
549 struct slot_info *s;
550 int ret, slot_num;
551 struct receiver *r = a->receiver;
552 struct receiver_node *rn;
553
554 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
555 ret = get_empty_slot();
556 if (ret < 0)
557 return ret;
558 slot_num = ret;
559 rn = para_calloc(sizeof(*rn));
560 rn->receiver = r;
561 rn->conf = a->receiver_conf;
562 rn->btrn = btr_new_node(&(struct btr_node_description)
563 EMBRACE(.name = r->name, .context = rn));
564 ret = r->open(rn);
565 if (ret < 0) {
566 btr_free_node(rn->btrn);
567 free(rn);
568 return ret;
569 }
570 s = &slot[slot_num];
571 s->format = format;
572 s->receiver_node = rn;
573 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
574 audio_formats[format], r->name, slot_num);
575 rn->task.pre_select = r->pre_select;
576 rn->task.post_select = r->post_select;
577 sprintf(rn->task.status, "%s receiver node", r->name);
578 register_task(&rn->task);
579 return slot_num;
580 }
581
582 static bool receiver_running(void)
583 {
584 int i;
585 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
586
587 FOR_EACH_SLOT(i) {
588 struct slot_info *s = &slot[i];
589 long unsigned ss2 = s->server_stream_start.tv_sec;
590
591 if (!s->receiver_node)
592 continue;
593 if (s->receiver_node->task.error >= 0)
594 return true;
595 if (ss1 == ss2)
596 return true;
597 }
598 return false;
599 }
600
601 /**
602 * Return the root node of the current buffer tree.
603 *
604 * This is only used for stream grabbing.
605 *
606 * \return \p NULL if no slot is currently active. If more than one buffer tree
607 * exists, the node corresponding to the most recently started receiver is
608 * returned.
609 */
610 struct btr_node *audiod_get_btr_root(void)
611 {
612 int i, newest_slot = -1;
613 struct timeval newest_rstime = {0, 0};
614
615 FOR_EACH_SLOT(i) {
616 struct slot_info *s = &slot[i];
617 struct timeval rstime;
618 if (!s->receiver_node)
619 continue;
620 if (s->receiver_node->task.error < 0)
621 continue;
622 btr_get_node_start(s->receiver_node->btrn, &rstime);
623 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
624 continue;
625 newest_rstime = rstime;
626 newest_slot = i;
627 }
628 if (newest_slot == -1)
629 return NULL;
630 return slot[newest_slot].receiver_node->btrn;
631 }
632
633 /* whether a new instance of a decoder should be started. */
634 static bool must_start_decoder(void)
635 {
636 int cafn = stat_task->current_audio_format_num;
637 unsigned vs = stat_task->vss_status;
638
639 if (audiod_status != AUDIOD_ON)
640 return false;
641 if (cafn < 0)
642 return false;
643 if (!stat_task->ct)
644 return false;
645 if (vs & VSS_STATUS_FLAG_NEXT)
646 return false;
647 if (!(vs & VSS_STATUS_FLAG_PLAYING))
648 return false;
649 if (receiver_running())
650 return false;
651 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
652 return false;
653 return true;
654 }
655
656 static unsigned compute_time_diff(const struct timeval *status_time)
657 {
658 struct timeval tmp, diff;
659 static unsigned count;
660 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
661 const struct timeval max_deviation = {0, 500 * 1000};
662 const int time_smooth = 5;
663
664 if (!status_time)
665 return count;
666 sign = tv_diff(status_time, now, &diff);
667 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
668 // sign, sa_time_diff_sign);
669 if (!count) {
670 sa_time_diff_sign = sign;
671 stat_task->sa_time_diff = diff;
672 count++;
673 goto out;
674 }
675 if (count > 5) {
676 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
677 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
678 PARA_WARNING_LOG("time diff jump: %lims\n",
679 s * tv2ms(&tmp));
680 }
681 count++;
682 sa_time_diff_sign = tv_convex_combination(
683 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
684 count > 10? sign : sign * time_smooth, &diff,
685 &tmp);
686 stat_task->sa_time_diff = tmp;
687 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
688 sign < 0? "-" : "+",
689 tv2ms(&diff),
690 sa_time_diff_sign < 0? "-" : "+",
691 tv2ms(&stat_task->sa_time_diff)
692 );
693 out:
694 stat_task->sa_time_diff_sign = sa_time_diff_sign;
695 return count;
696 }
697
698 static int update_item(int itemnum, char *buf)
699 {
700 long unsigned sec, usec;
701
702 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
703 return 1;
704 free(stat_item_values[itemnum]);
705 stat_item_values[itemnum] = para_strdup(buf);
706 stat_client_write_item(itemnum);
707 switch (itemnum) {
708 case SI_STATUS_FLAGS:
709 stat_task->vss_status = 0;
710 if (strchr(buf, 'N'))
711 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
712 if (strchr(buf, 'P'))
713 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
714 break;
715 case SI_OFFSET:
716 stat_task->offset_seconds = atoi(buf);
717 break;
718 case SI_SECONDS_TOTAL:
719 stat_task->length_seconds = atoi(buf);
720 break;
721 case SI_STREAM_START:
722 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
723 stat_task->server_stream_start.tv_sec = sec;
724 stat_task->server_stream_start.tv_usec = usec;
725 }
726 break;
727 case SI_CURRENT_TIME:
728 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
729 struct timeval tv = {sec, usec};
730 compute_time_diff(&tv);
731 }
732 break;
733 case SI_FORMAT:
734 stat_task->current_audio_format_num
735 = get_audio_format_num(buf);
736 }
737 return 1;
738 }
739
740 static int parse_stream_command(const char *txt, char **cmd)
741 {
742 char *p = strchr(txt, ':');
743 int i;
744
745 if (!p)
746 return -E_MISSING_COLON;
747 p++;
748 FOR_EACH_AUDIO_FORMAT(i) {
749 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
750 continue;
751 *cmd = p;
752 return i;
753 }
754 return -E_UNSUPPORTED_AUDIO_FORMAT;
755 }
756
757 static int add_filter(int format, char *cmdline)
758 {
759 struct audio_format_info *a = &afi[format];
760 int filter_num, nf = a->num_filters;
761
762 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
763 if (filter_num < 0)
764 return filter_num;
765 a->filter_nums[nf] = filter_num;
766 a->num_filters++;
767 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
768 filters[filter_num].name);
769 return filter_num;
770 }
771
772 static int parse_writer_args(void)
773 {
774 int i, ret, nw;
775 char *cmd;
776 struct audio_format_info *a;
777
778 nw = PARA_MAX(1U, conf.writer_given);
779 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
780 FOR_EACH_AUDIO_FORMAT(i) {
781 a = &afi[i];
782 a->writer_conf = para_malloc(nw * sizeof(void *));
783 a->writer_nums = para_malloc(nw * sizeof(int));
784 a->num_writers = 0;
785 }
786 for (i = 0; i < conf.writer_given; i++) {
787 void *wconf;
788 int writer_num;
789 ret = parse_stream_command(conf.writer_arg[i], &cmd);
790 if (ret < 0)
791 goto out;
792 a = &afi[ret];
793 nw = a->num_writers;
794 wconf = check_writer_arg(cmd, &writer_num);
795 if (!wconf) {
796 ret = writer_num;
797 goto out;
798 }
799 a->writer_nums[nw] = writer_num;
800 a->writer_conf[nw] = wconf;
801 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
802 nw, writer_names[writer_num]);
803 a->num_writers++;
804 }
805 ret = 1;
806 out:
807 return ret;
808 }
809
810 static int parse_receiver_args(void)
811 {
812 int i, ret, receiver_num;
813 char *cmd = NULL;
814 struct audio_format_info *a;
815
816 for (i = conf.receiver_given - 1; i >= 0; i--) {
817 char *arg = conf.receiver_arg[i];
818 char *recv_arg = strchr(arg, ':');
819 ret = -E_MISSING_COLON;
820 if (!recv_arg)
821 goto out;
822 *recv_arg = '\0';
823 recv_arg++;
824 ret = get_audio_format_num(arg);
825 if (ret < 0)
826 goto out;
827 /*
828 * If multiple receivers are given for this audio format, the
829 * last one wins and we have to free the previous receiver
830 * config here. Since we are iterating backwards, the winning
831 * receiver arg is in fact the first one given.
832 */
833 if (afi[ret].receiver_conf)
834 afi[ret].receiver->free_config(afi[ret].receiver_conf);
835 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
836 if (!afi[ret].receiver_conf) {
837 ret = -E_RECV_SYNTAX;
838 goto out;
839 }
840 afi[ret].receiver = &receivers[receiver_num];
841 }
842 /*
843 * Use the first available receiver with no arguments for those audio
844 * formats for which no receiver was specified.
845 */
846 cmd = para_strdup(receivers[0].name);
847 FOR_EACH_AUDIO_FORMAT(i) {
848 a = &afi[i];
849 if (a->receiver_conf)
850 continue;
851 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
852 if (!a->receiver_conf)
853 return -E_RECV_SYNTAX;
854 a->receiver = &receivers[receiver_num];
855 }
856 ret = 1;
857 out:
858 free(cmd);
859 return ret;
860 }
861
862 static int init_default_filters(void)
863 {
864 int i, ret = 1;
865
866 FOR_EACH_AUDIO_FORMAT(i) {
867 struct audio_format_info *a = &afi[i];
868 char *tmp;
869 int j;
870
871 if (a->num_filters)
872 continue; /* no default -- nothing to to */
873 /*
874 * If udp is used to receive this audiod format, add fecdec as
875 * the first filter.
876 */
877 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
878 strcmp(afi[i].receiver->name, "dccp") == 0) {
879 tmp = para_strdup("fecdec");
880 add_filter(i, tmp);
881 free(tmp);
882 if (ret < 0)
883 goto out;
884 }
885 /* add "dec" to audio format name */
886 tmp = make_message("%sdec", audio_formats[i]);
887 for (j = 0; filters[j].name; j++)
888 if (!strcmp(tmp, filters[j].name))
889 break;
890 free(tmp);
891 ret = -E_UNSUPPORTED_FILTER;
892 if (!filters[j].name)
893 goto out;
894 tmp = para_strdup(filters[j].name);
895 ret = add_filter(i, tmp);
896 free(tmp);
897 if (ret < 0)
898 goto out;
899 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
900 filters[j].name);
901 }
902 out:
903 return ret;
904 }
905
906 static int parse_filter_args(void)
907 {
908 int i, ret, nf;
909
910 nf = PARA_MAX(2U, conf.filter_given);
911 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
912 FOR_EACH_AUDIO_FORMAT(i) {
913 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
914 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
915 }
916 if (!conf.no_default_filters_given)
917 return init_default_filters();
918 for (i = 0; i < conf.filter_given; i++) {
919 char *arg = conf.filter_arg[i];
920 char *filter_name = strchr(arg, ':');
921 ret = -E_MISSING_COLON;
922 if (!filter_name)
923 goto out;
924 *filter_name = '\0';
925 filter_name++;
926 ret = get_audio_format_num(arg);
927 if (ret < 0)
928 goto out;
929 ret = add_filter(ret, filter_name);
930 if (ret < 0)
931 goto out;
932 }
933 ret = init_default_filters(); /* use default values for the rest */
934 out:
935 return ret;
936 }
937
938 static int parse_stream_args(void)
939 {
940 int ret;
941
942 ret = parse_receiver_args();
943 if (ret < 0)
944 return ret;
945 ret = parse_filter_args();
946 if (ret < 0)
947 return ret;
948 ret = parse_writer_args();
949 if (ret < 0)
950 return ret;
951 return 1;
952 }
953
954 /* does not unlink socket on errors */
955 static int audiod_get_socket(void)
956 {
957 struct sockaddr_un unix_addr;
958 int ret, fd;
959
960 if (conf.socket_given)
961 socket_name = para_strdup(conf.socket_arg);
962 else {
963 char *hn = para_hostname();
964 socket_name = make_message("/var/paraslash/audiod_socket.%s",
965 hn);
966 free(hn);
967 }
968 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
969 if (conf.force_given)
970 unlink(socket_name);
971 ret = create_local_socket(socket_name, &unix_addr,
972 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
973 if (ret < 0)
974 goto err;
975 fd = ret;
976 if (listen(fd , 5) < 0) {
977 ret = -ERRNO_TO_PARA_ERROR(errno);
978 goto err;
979 }
980 ret = mark_fd_nonblocking(fd);
981 if (ret < 0)
982 goto err;
983 return fd;
984 err:
985 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
986 exit(EXIT_FAILURE);
987 }
988
989 static void signal_pre_select(struct sched *s, struct task *t)
990 {
991 struct signal_task *st = container_of(t, struct signal_task, task);
992 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
993 }
994
995 static void signal_post_select(struct sched *s, __a_unused struct task *t)
996 {
997 int signum;
998
999 signum = para_next_signal(&s->rfds);
1000 switch (signum) {
1001 case SIGINT:
1002 case SIGTERM:
1003 case SIGHUP:
1004 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1005 clean_exit(EXIT_FAILURE, "caught deadly signal");
1006 }
1007 }
1008
1009 static void signal_setup_default(struct signal_task *st)
1010 {
1011 st->task.pre_select = signal_pre_select;
1012 st->task.post_select = signal_post_select;
1013 sprintf(st->task.status, "signal task");
1014 }
1015
1016 static void command_pre_select(struct sched *s, struct task *t)
1017 {
1018 struct command_task *ct = container_of(t, struct command_task, task);
1019 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1020 }
1021
1022 static void command_post_select(struct sched *s, struct task *t)
1023 {
1024 int ret;
1025 struct command_task *ct = container_of(t, struct command_task, task);
1026 static struct timeval last_status_dump;
1027 struct timeval tmp, delay = {0, 500 * 1000};
1028
1029 tv_add(&last_status_dump, &delay, &tmp);
1030 if (tv_diff(&tmp, now, NULL) < 0) {
1031 audiod_status_dump();
1032 last_status_dump = *now;
1033 }
1034
1035 ret = handle_connect(ct->fd, &s->rfds);
1036 if (ret < 0)
1037 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1038 audiod_status_dump();
1039 }
1040
1041 static void init_command_task(struct command_task *ct)
1042 {
1043 ct->task.pre_select = command_pre_select;
1044 ct->task.post_select = command_post_select;
1045 ct->task.error = 0;
1046 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1047 sprintf(ct->task.status, "command task");
1048 }
1049
1050 static void close_stat_pipe(void)
1051 {
1052 if (!stat_task->ct)
1053 return;
1054 btr_free_node(stat_task->ct->btrn);
1055 client_close(stat_task->ct);
1056 stat_task->ct = NULL;
1057 clear_and_dump_items();
1058 stat_task->length_seconds = 0;
1059 stat_task->offset_seconds = 0;
1060 stat_task->vss_status = 0;
1061 stat_task->current_audio_format_num = -1;
1062 audiod_status_dump();
1063 }
1064
1065 /**
1066 * close the connection to para_server and exit
1067 *
1068 * \param status the exit status which is passed to exit(3)
1069 * \param msg the log message
1070 *
1071 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1072 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1073 * EXIT_FAILURE.
1074 *
1075 * \sa exit(3)
1076 */
1077 void __noreturn clean_exit(int status, const char *msg)
1078 {
1079 PARA_EMERG_LOG("%s\n", msg);
1080 if (socket_name)
1081 unlink(socket_name);
1082 close_stat_pipe();
1083 exit(status);
1084 }
1085
1086 /* avoid busy loop if server is down */
1087 static void set_stat_task_restart_barrier(unsigned seconds)
1088 {
1089 struct timeval delay = {seconds, 0};
1090 tv_add(now, &delay, &stat_task->restart_barrier);
1091 }
1092
1093 static void try_to_close_slot(int slot_num)
1094 {
1095 struct slot_info *s = &slot[slot_num];
1096 struct audio_format_info *a = afi + s->format;
1097 int i;
1098
1099 if (s->format < 0)
1100 return;
1101 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1102 return;
1103 for (i = 0; i < a->num_filters; i++)
1104 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1105 return;
1106 if (a->num_writers > 0) {
1107 for (i = 0; i < a->num_writers; i++)
1108 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1109 return;
1110 } else {
1111 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1112 return;
1113 }
1114 PARA_INFO_LOG("closing slot %d\n", slot_num);
1115 close_writers(s);
1116 close_filters(s);
1117 close_receiver(slot_num);
1118 clear_slot(slot_num);
1119 }
1120
1121 /*
1122 * Check if any receivers/filters/writers need to be started and do so if
1123 * necessary.
1124 */
1125 static void start_stop_decoders(void)
1126 {
1127 int i, ret;
1128 struct slot_info *sl;
1129 struct audio_format_info *a;
1130
1131 FOR_EACH_SLOT(i)
1132 try_to_close_slot(i);
1133 if (audiod_status != AUDIOD_ON ||
1134 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1135 return kill_all_decoders(-E_NOT_PLAYING);
1136 if (!must_start_decoder())
1137 return;
1138 ret = open_receiver(stat_task->current_audio_format_num);
1139 if (ret < 0) {
1140 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1141 return;
1142 }
1143 sl = slot + ret;
1144 a = afi + sl->format;
1145 if (a->num_filters)
1146 open_filters(sl);
1147 open_writers(sl);
1148 activate_grab_clients();
1149 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1150 }
1151
1152 static void status_pre_select(struct sched *s, struct task *t)
1153 {
1154 struct status_task *st = container_of(t, struct status_task, task);
1155 int ret, cafn = stat_task->current_audio_format_num;
1156
1157 if (must_start_decoder())
1158 goto min_delay;
1159 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1160 if (ret > 0)
1161 goto min_delay;
1162 if (st->ct && audiod_status == AUDIOD_OFF)
1163 goto min_delay;
1164 if (!st->ct && audiod_status != AUDIOD_OFF)
1165 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1166 if (cafn >= 0)
1167 sched_request_barrier(&afi[cafn].restart_barrier, s);
1168 /*
1169 * If para_server is playing we'd like to have a smooth time display
1170 * even if we are running in standby mode. So we request a timeout that
1171 * expires at the next full second.
1172 */
1173 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1174 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1175 return;
1176 min_delay:
1177 sched_min_delay(s);
1178 }
1179
1180 /* restart the client task if necessary */
1181 static void status_post_select(__a_unused struct sched *s, struct task *t)
1182 {
1183 struct status_task *st = container_of(t, struct status_task, task);
1184
1185 if (audiod_status == AUDIOD_OFF) {
1186 if (!st->ct)
1187 goto out;
1188 if (st->ct->task.error >= 0) {
1189 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1190 goto out;
1191 }
1192 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1193 goto out;
1194 close_stat_pipe();
1195 st->clock_diff_count = conf.clock_diff_count_arg;
1196 goto out;
1197 }
1198 if (st->ct) {
1199 char *buf;
1200 size_t sz;
1201 int ret;
1202 if (st->ct->task.error < 0) {
1203 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1204 goto out;
1205 close_stat_pipe();
1206 goto out;
1207 }
1208 if (st->ct->status != CL_RECEIVING)
1209 goto out;
1210 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1211 if (ret <= 0) {
1212 struct timeval diff;
1213 tv_diff(now, &st->last_status_read, &diff);
1214 if (diff.tv_sec > 61)
1215 kill_btrn(st->ct->btrn, &st->ct->task,
1216 -E_STATUS_TIMEOUT);
1217 goto out;
1218 }
1219 btr_merge(st->btrn, st->min_iqs);
1220 sz = btr_next_buffer(st->btrn, &buf);
1221 ret = for_each_stat_item(buf, sz, update_item);
1222 if (ret < 0) {
1223 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1224 goto out;
1225 }
1226 if (sz != ret) {
1227 btr_consume(st->btrn, sz - ret);
1228 st->last_status_read = *now;
1229 st->min_iqs = 0;
1230 } else /* current status item crosses buffers */
1231 st->min_iqs = sz + 1;
1232 goto out;
1233 }
1234 btr_drain(st->btrn);
1235 st->current_audio_format_num = -1;
1236 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1237 goto out;
1238 if (st->clock_diff_count) { /* get status only one time */
1239 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1240 int argc = 5;
1241 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1242 st->clock_diff_count--;
1243 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1244 set_stat_task_restart_barrier(2);
1245
1246 } else {
1247 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1248 int argc = 4;
1249 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1250 set_stat_task_restart_barrier(5);
1251 }
1252 free(stat_item_values[SI_BASENAME]);
1253 stat_item_values[SI_BASENAME] = para_strdup(
1254 "no connection to para_server");
1255 stat_client_write_item(SI_BASENAME);
1256 st->last_status_read = *now;
1257 out:
1258 start_stop_decoders();
1259 }
1260
1261 static void init_status_task(struct status_task *st)
1262 {
1263 memset(st, 0, sizeof(struct status_task));
1264 st->task.pre_select = status_pre_select;
1265 st->task.post_select = status_post_select;
1266 st->sa_time_diff_sign = 1;
1267 st->clock_diff_count = conf.clock_diff_count_arg;
1268 st->current_audio_format_num = -1;
1269 sprintf(st->task.status, "stat");
1270 st->btrn = btr_new_node(&(struct btr_node_description)
1271 EMBRACE(.name = "stat"));
1272 }
1273
1274 static void set_initial_status(void)
1275 {
1276 audiod_status = AUDIOD_ON;
1277 if (!conf.mode_given)
1278 return;
1279 if (!strcmp(conf.mode_arg, "sb")) {
1280 audiod_status = AUDIOD_STANDBY;
1281 return;
1282 }
1283 if (!strcmp(conf.mode_arg, "off")) {
1284 audiod_status = AUDIOD_OFF;
1285 return;
1286 }
1287 if (strcmp(conf.mode_arg, "on"))
1288 PARA_WARNING_LOG("invalid mode\n");
1289 }
1290
1291 __noreturn static void print_help_and_die(void)
1292 {
1293 int d = conf.detailed_help_given;
1294 const char **p = d? audiod_args_info_detailed_help
1295 : audiod_args_info_help;
1296
1297 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1298 AUDIOD_CMDLINE_PARSER_VERSION);
1299 printf_or_die("%s\n\n", audiod_args_info_usage);
1300 for (; *p; p++)
1301 printf_or_die("%s\n", *p);
1302 print_receiver_helps(d);
1303 print_filter_helps(d);
1304 print_writer_helps(d);
1305 exit(0);
1306 }
1307
1308 static void init_colors_or_die(void)
1309 {
1310 int i;
1311
1312 if (!want_colors())
1313 return;
1314 daemon_set_default_log_colors();
1315 daemon_set_flag(DF_COLOR_LOG);
1316 for (i = 0; i < conf.log_color_given; i++)
1317 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1318 }
1319
1320 /**
1321 * the main function of para_audiod
1322 *
1323 * \param argc usual argument count
1324 * \param argv usual argument vector
1325 *
1326 * \return EXIT_SUCCESS or EXIT_FAILURE
1327 *
1328 * \sa para_audiod(1)
1329 * */
1330 int main(int argc, char *argv[])
1331 {
1332 int ret, i;
1333 static struct sched s;
1334 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1335 struct audiod_cmdline_parser_params params = {
1336 .override = 0,
1337 .initialize = 1,
1338 .check_required = 0,
1339 .check_ambiguity = 0,
1340 .print_errors = 1
1341 };
1342
1343 valid_fd_012();
1344 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1345 exit(EXIT_FAILURE);
1346 HANDLE_VERSION_FLAG("audiod", conf);
1347 /* init receivers/filters/writers early to make help work */
1348 recv_init();
1349 filter_init();
1350 writer_init();
1351 if (conf.help_given || conf.detailed_help_given)
1352 print_help_and_die();
1353 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1354 parse_config_or_die();
1355 init_colors_or_die();
1356 init_random_seed_or_die();
1357 daemon_set_flag(DF_LOG_TIME);
1358 daemon_set_flag(DF_LOG_HOSTNAME);
1359 daemon_set_flag(DF_LOG_LL);
1360 if (conf.log_timing_given)
1361 daemon_set_flag(DF_LOG_TIMING);
1362 if (conf.logfile_given) {
1363 daemon_set_logfile(conf.logfile_arg);
1364 daemon_open_log_or_die();
1365 }
1366 ret = parse_stream_args();
1367 if (ret < 0) {
1368 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1369 exit(EXIT_FAILURE);
1370 }
1371 log_welcome("para_audiod");
1372 server_uptime(UPTIME_SET);
1373 set_initial_status();
1374 FOR_EACH_SLOT(i)
1375 clear_slot(i);
1376 setup_signal_handling();
1377 signal_setup_default(sig_task);
1378
1379 init_status_task(stat_task);
1380 init_command_task(cmd_task);
1381
1382 if (conf.daemon_given)
1383 daemonize();
1384
1385 register_task(&sig_task->task);
1386 register_task(&cmd_task->task);
1387 register_task(&stat_task->task);
1388 s.default_timeout.tv_sec = 2;
1389 s.default_timeout.tv_usec = 999 * 1000;
1390 ret = schedule(&s);
1391
1392 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1393 return EXIT_FAILURE;
1394 }