Merge branch 't/gvf'
[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 static 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 static void open_filters(struct slot_info *s)
474 {
475 struct audio_format_info *a = afi + s->format;
476 struct filter_node *fn;
477 int nf = a->num_filters;
478 struct btr_node *parent;
479 int i;
480
481 if (nf == 0)
482 return;
483 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
484 assert(s->fns == NULL);
485 s->fns = para_calloc(nf * sizeof(struct filter_node));
486 parent = s->receiver_node->btrn;
487 for (i = 0; i < nf; i++) {
488 struct filter *f = filters + a->filter_nums[i];
489 fn = s->fns + i;
490 fn->filter_num = a->filter_nums[i];
491 fn->conf = a->filter_conf[i];
492 fn->task.pre_select = f->pre_select;
493 fn->task.post_select = f->post_select;
494
495 fn->btrn = btr_new_node(&(struct btr_node_description)
496 EMBRACE(.name = f->name, .parent = parent,
497 .handler = f->execute, .context = fn));
498
499 f->open(fn);
500 register_task(&fn->task);
501 parent = fn->btrn;
502 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
503 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
504 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
505 }
506 }
507
508 static void open_writers(struct slot_info *s)
509 {
510 int i;
511 struct audio_format_info *a = afi + s->format;
512 struct writer_node *wn;
513 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
514
515 assert(s->wns == NULL);
516 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
517 * sizeof(struct writer_node));
518 if (a->num_writers == 0)
519 setup_writer_node(NULL, parent, s->wns);
520 else {
521 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
522 for (i = 0; i < a->num_writers; i++) {
523 wn = s->wns + i;
524 wn->conf = a->writer_conf[i];
525 wn->writer_num = a->writer_nums[i];
526 register_writer_node(wn, parent);
527 }
528 }
529 }
530
531 /* returns slot num on success */
532 static int open_receiver(int format)
533 {
534 struct audio_format_info *a = &afi[format];
535 struct slot_info *s;
536 int ret, slot_num;
537 struct receiver *r = a->receiver;
538 struct receiver_node *rn;
539
540 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
541 ret = get_empty_slot();
542 if (ret < 0)
543 return ret;
544 slot_num = ret;
545 rn = para_calloc(sizeof(*rn));
546 rn->receiver = r;
547 rn->conf = a->receiver_conf;
548 rn->btrn = btr_new_node(&(struct btr_node_description)
549 EMBRACE(.name = r->name, .context = rn));
550 ret = r->open(rn);
551 if (ret < 0) {
552 btr_free_node(rn->btrn);
553 free(rn);
554 return ret;
555 }
556 s = &slot[slot_num];
557 s->format = format;
558 s->receiver_node = rn;
559 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
560 audio_formats[format], r->name, slot_num);
561 rn->task.pre_select = r->pre_select;
562 rn->task.post_select = r->post_select;
563 sprintf(rn->task.status, "%s receiver node", r->name);
564 register_task(&rn->task);
565 return slot_num;
566 }
567
568 static bool receiver_running(void)
569 {
570 int i;
571 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
572
573 FOR_EACH_SLOT(i) {
574 struct slot_info *s = &slot[i];
575 long unsigned ss2 = s->server_stream_start.tv_sec;
576
577 if (!s->receiver_node)
578 continue;
579 if (s->receiver_node->task.error >= 0)
580 return true;
581 if (ss1 == ss2)
582 return true;
583 }
584 return false;
585 }
586
587 /**
588 * Return the root node of the current buffer tree.
589 *
590 * This is only used for stream grabbing.
591 *
592 * \return \p NULL if no slot is currently active. If more than one buffer tree
593 * exists, the node corresponding to the most recently started receiver is
594 * returned.
595 */
596 struct btr_node *audiod_get_btr_root(void)
597 {
598 int i, newest_slot = -1;
599 struct timeval newest_rstime = {0, 0};
600
601 FOR_EACH_SLOT(i) {
602 struct slot_info *s = &slot[i];
603 struct timeval rstime;
604 if (!s->receiver_node)
605 continue;
606 if (s->receiver_node->task.error < 0)
607 continue;
608 btr_get_node_start(s->receiver_node->btrn, &rstime);
609 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
610 continue;
611 newest_rstime = rstime;
612 newest_slot = i;
613 }
614 if (newest_slot == -1)
615 return NULL;
616 return slot[newest_slot].receiver_node->btrn;
617 }
618
619 /* whether a new instance of a decoder should be started. */
620 static bool must_start_decoder(void)
621 {
622 int cafn = stat_task->current_audio_format_num;
623 unsigned vs = stat_task->vss_status;
624
625 if (audiod_status != AUDIOD_ON)
626 return false;
627 if (cafn < 0)
628 return false;
629 if (!stat_task->ct)
630 return false;
631 if (vs & VSS_STATUS_FLAG_NEXT)
632 return false;
633 if (!(vs & VSS_STATUS_FLAG_PLAYING))
634 return false;
635 if (receiver_running())
636 return false;
637 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
638 return false;
639 return true;
640 }
641
642 static unsigned compute_time_diff(const struct timeval *status_time)
643 {
644 struct timeval tmp, diff;
645 static unsigned count;
646 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
647 const struct timeval max_deviation = {0, 500 * 1000};
648 const int time_smooth = 5;
649
650 if (!status_time)
651 return count;
652 sign = tv_diff(status_time, now, &diff);
653 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
654 // sign, sa_time_diff_sign);
655 if (!count) {
656 sa_time_diff_sign = sign;
657 stat_task->sa_time_diff = diff;
658 count++;
659 goto out;
660 }
661 if (count > 5) {
662 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
663 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
664 PARA_WARNING_LOG("time diff jump: %lims\n",
665 s * tv2ms(&tmp));
666 }
667 count++;
668 sa_time_diff_sign = tv_convex_combination(
669 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
670 count > 10? sign : sign * time_smooth, &diff,
671 &tmp);
672 stat_task->sa_time_diff = tmp;
673 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
674 sign < 0? "-" : "+",
675 tv2ms(&diff),
676 sa_time_diff_sign < 0? "-" : "+",
677 tv2ms(&stat_task->sa_time_diff)
678 );
679 out:
680 stat_task->sa_time_diff_sign = sa_time_diff_sign;
681 return count;
682 }
683
684 static int update_item(int itemnum, char *buf)
685 {
686 long unsigned sec, usec;
687
688 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
689 return 1;
690 free(stat_item_values[itemnum]);
691 stat_item_values[itemnum] = para_strdup(buf);
692 stat_client_write_item(itemnum);
693 switch (itemnum) {
694 case SI_STATUS_FLAGS:
695 stat_task->vss_status = 0;
696 if (strchr(buf, 'N'))
697 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
698 if (strchr(buf, 'P'))
699 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
700 break;
701 case SI_OFFSET:
702 stat_task->offset_seconds = atoi(buf);
703 break;
704 case SI_SECONDS_TOTAL:
705 stat_task->length_seconds = atoi(buf);
706 break;
707 case SI_STREAM_START:
708 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
709 stat_task->server_stream_start.tv_sec = sec;
710 stat_task->server_stream_start.tv_usec = usec;
711 }
712 break;
713 case SI_CURRENT_TIME:
714 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
715 struct timeval tv = {sec, usec};
716 compute_time_diff(&tv);
717 }
718 break;
719 case SI_FORMAT:
720 stat_task->current_audio_format_num
721 = get_audio_format_num(buf);
722 }
723 return 1;
724 }
725
726 static int parse_stream_command(const char *txt, char **cmd)
727 {
728 char *p = strchr(txt, ':');
729 int i;
730
731 if (!p)
732 return -E_MISSING_COLON;
733 p++;
734 FOR_EACH_AUDIO_FORMAT(i) {
735 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
736 continue;
737 *cmd = p;
738 return i;
739 }
740 return -E_UNSUPPORTED_AUDIO_FORMAT;
741 }
742
743 static int add_filter(int format, char *cmdline)
744 {
745 struct audio_format_info *a = &afi[format];
746 int filter_num, nf = a->num_filters;
747
748 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
749 if (filter_num < 0)
750 return filter_num;
751 a->filter_nums[nf] = filter_num;
752 a->num_filters++;
753 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
754 filters[filter_num].name);
755 return filter_num;
756 }
757
758 static int parse_writer_args(void)
759 {
760 int i, ret, nw;
761 char *cmd;
762 struct audio_format_info *a;
763
764 nw = PARA_MAX(1U, conf.writer_given);
765 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
766 FOR_EACH_AUDIO_FORMAT(i) {
767 a = &afi[i];
768 a->writer_conf = para_malloc(nw * sizeof(void *));
769 a->writer_nums = para_malloc(nw * sizeof(int));
770 a->num_writers = 0;
771 }
772 for (i = 0; i < conf.writer_given; i++) {
773 void *wconf;
774 int writer_num;
775 ret = parse_stream_command(conf.writer_arg[i], &cmd);
776 if (ret < 0)
777 goto out;
778 a = &afi[ret];
779 nw = a->num_writers;
780 wconf = check_writer_arg(cmd, &writer_num);
781 if (!wconf) {
782 ret = writer_num;
783 goto out;
784 }
785 a->writer_nums[nw] = writer_num;
786 a->writer_conf[nw] = wconf;
787 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
788 nw, writer_names[writer_num]);
789 a->num_writers++;
790 }
791 ret = 1;
792 out:
793 return ret;
794 }
795
796 static int parse_receiver_args(void)
797 {
798 int i, ret, receiver_num;
799 char *cmd = NULL;
800 struct audio_format_info *a;
801
802 for (i = conf.receiver_given - 1; i >= 0; i--) {
803 char *arg = conf.receiver_arg[i];
804 char *recv_arg = strchr(arg, ':');
805 ret = -E_MISSING_COLON;
806 if (!recv_arg)
807 goto out;
808 *recv_arg = '\0';
809 recv_arg++;
810 ret = get_audio_format_num(arg);
811 if (ret < 0)
812 goto out;
813 /*
814 * If multiple receivers are given for this audio format, the
815 * last one wins and we have to free the previous receiver
816 * config here. Since we are iterating backwards, the winning
817 * receiver arg is in fact the first one given.
818 */
819 if (afi[ret].receiver_conf)
820 afi[ret].receiver->free_config(afi[ret].receiver_conf);
821 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
822 if (!afi[ret].receiver_conf) {
823 ret = -E_RECV_SYNTAX;
824 goto out;
825 }
826 afi[ret].receiver = &receivers[receiver_num];
827 }
828 /*
829 * Use the first available receiver with no arguments for those audio
830 * formats for which no receiver was specified.
831 */
832 cmd = para_strdup(receivers[0].name);
833 FOR_EACH_AUDIO_FORMAT(i) {
834 a = &afi[i];
835 if (a->receiver_conf)
836 continue;
837 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
838 if (!a->receiver_conf)
839 return -E_RECV_SYNTAX;
840 a->receiver = &receivers[receiver_num];
841 }
842 ret = 1;
843 out:
844 free(cmd);
845 return ret;
846 }
847
848 static int init_default_filters(void)
849 {
850 int i, ret = 1;
851
852 FOR_EACH_AUDIO_FORMAT(i) {
853 struct audio_format_info *a = &afi[i];
854 char *tmp;
855 int j;
856
857 if (a->num_filters)
858 continue; /* no default -- nothing to to */
859 /*
860 * If udp is used to receive this audiod format, add fecdec as
861 * the first filter.
862 */
863 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
864 strcmp(afi[i].receiver->name, "dccp") == 0) {
865 tmp = para_strdup("fecdec");
866 add_filter(i, tmp);
867 free(tmp);
868 if (ret < 0)
869 goto out;
870 }
871 /* add "dec" to audio format name */
872 tmp = make_message("%sdec", audio_formats[i]);
873 for (j = 0; filters[j].name; j++)
874 if (!strcmp(tmp, filters[j].name))
875 break;
876 free(tmp);
877 ret = -E_UNSUPPORTED_FILTER;
878 if (!filters[j].name)
879 goto out;
880 tmp = para_strdup(filters[j].name);
881 ret = add_filter(i, tmp);
882 free(tmp);
883 if (ret < 0)
884 goto out;
885 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
886 filters[j].name);
887 }
888 out:
889 return ret;
890 }
891
892 static int parse_filter_args(void)
893 {
894 int i, ret, nf;
895
896 nf = PARA_MAX(2U, conf.filter_given);
897 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
898 FOR_EACH_AUDIO_FORMAT(i) {
899 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
900 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
901 }
902 if (!conf.no_default_filters_given)
903 return init_default_filters();
904 for (i = 0; i < conf.filter_given; i++) {
905 char *arg = conf.filter_arg[i];
906 char *filter_name = strchr(arg, ':');
907 ret = -E_MISSING_COLON;
908 if (!filter_name)
909 goto out;
910 *filter_name = '\0';
911 filter_name++;
912 ret = get_audio_format_num(arg);
913 if (ret < 0)
914 goto out;
915 ret = add_filter(ret, filter_name);
916 if (ret < 0)
917 goto out;
918 }
919 ret = init_default_filters(); /* use default values for the rest */
920 out:
921 return ret;
922 }
923
924 static int parse_stream_args(void)
925 {
926 int ret;
927
928 ret = parse_receiver_args();
929 if (ret < 0)
930 return ret;
931 ret = parse_filter_args();
932 if (ret < 0)
933 return ret;
934 ret = parse_writer_args();
935 if (ret < 0)
936 return ret;
937 return 1;
938 }
939
940 /* does not unlink socket on errors */
941 static int audiod_get_socket(void)
942 {
943 struct sockaddr_un unix_addr;
944 int ret, fd;
945
946 if (conf.socket_given)
947 socket_name = para_strdup(conf.socket_arg);
948 else {
949 char *hn = para_hostname();
950 socket_name = make_message("/var/paraslash/audiod_socket.%s",
951 hn);
952 free(hn);
953 }
954 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
955 if (conf.force_given)
956 unlink(socket_name);
957 ret = create_local_socket(socket_name, &unix_addr,
958 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
959 if (ret < 0)
960 goto err;
961 fd = ret;
962 if (listen(fd , 5) < 0) {
963 ret = -ERRNO_TO_PARA_ERROR(errno);
964 goto err;
965 }
966 ret = mark_fd_nonblocking(fd);
967 if (ret < 0)
968 goto err;
969 return fd;
970 err:
971 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
972 exit(EXIT_FAILURE);
973 }
974
975 static void signal_pre_select(struct sched *s, struct task *t)
976 {
977 struct signal_task *st = container_of(t, struct signal_task, task);
978 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
979 }
980
981 static void signal_post_select(struct sched *s, __a_unused struct task *t)
982 {
983 int signum;
984
985 signum = para_next_signal(&s->rfds);
986 switch (signum) {
987 case SIGINT:
988 case SIGTERM:
989 case SIGHUP:
990 PARA_EMERG_LOG("terminating on signal %d\n", signum);
991 clean_exit(EXIT_FAILURE, "caught deadly signal");
992 }
993 }
994
995 static void signal_setup_default(struct signal_task *st)
996 {
997 st->task.pre_select = signal_pre_select;
998 st->task.post_select = signal_post_select;
999 sprintf(st->task.status, "signal task");
1000 }
1001
1002 static void command_pre_select(struct sched *s, struct task *t)
1003 {
1004 struct command_task *ct = container_of(t, struct command_task, task);
1005 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1006 }
1007
1008 static void command_post_select(struct sched *s, struct task *t)
1009 {
1010 int ret;
1011 struct command_task *ct = container_of(t, struct command_task, task);
1012 static struct timeval last_status_dump;
1013 struct timeval tmp, delay = {0, 500 * 1000};
1014
1015 tv_add(&last_status_dump, &delay, &tmp);
1016 if (tv_diff(&tmp, now, NULL) < 0) {
1017 audiod_status_dump();
1018 last_status_dump = *now;
1019 }
1020
1021 ret = handle_connect(ct->fd, &s->rfds);
1022 if (ret < 0)
1023 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1024 audiod_status_dump();
1025 }
1026
1027 static void init_command_task(struct command_task *ct)
1028 {
1029 ct->task.pre_select = command_pre_select;
1030 ct->task.post_select = command_post_select;
1031 ct->task.error = 0;
1032 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1033 sprintf(ct->task.status, "command task");
1034 }
1035
1036 static void close_stat_pipe(void)
1037 {
1038 if (!stat_task->ct)
1039 return;
1040 btr_free_node(stat_task->ct->btrn);
1041 client_close(stat_task->ct);
1042 stat_task->ct = NULL;
1043 clear_and_dump_items();
1044 stat_task->length_seconds = 0;
1045 stat_task->offset_seconds = 0;
1046 stat_task->vss_status = 0;
1047 stat_task->current_audio_format_num = -1;
1048 audiod_status_dump();
1049 }
1050
1051 /**
1052 * close the connection to para_server and exit
1053 *
1054 * \param status the exit status which is passed to exit(3)
1055 * \param msg the log message
1056 *
1057 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1058 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1059 * EXIT_FAILURE.
1060 *
1061 * \sa exit(3)
1062 */
1063 void __noreturn clean_exit(int status, const char *msg)
1064 {
1065 PARA_EMERG_LOG("%s\n", msg);
1066 if (socket_name)
1067 unlink(socket_name);
1068 close_stat_pipe();
1069 exit(status);
1070 }
1071
1072 /* avoid busy loop if server is down */
1073 static void set_stat_task_restart_barrier(unsigned seconds)
1074 {
1075 struct timeval delay = {seconds, 0};
1076 tv_add(now, &delay, &stat_task->restart_barrier);
1077 }
1078
1079 static void try_to_close_slot(int slot_num)
1080 {
1081 struct slot_info *s = &slot[slot_num];
1082 struct audio_format_info *a = afi + s->format;
1083 int i;
1084
1085 if (s->format < 0)
1086 return;
1087 if (s->receiver_node && s->receiver_node->task.error >= 0)
1088 return;
1089 for (i = 0; i < a->num_filters; i++)
1090 if (s->fns && s->fns[i].task.error >= 0)
1091 return;
1092 if (a->num_writers > 0) {
1093 for (i = 0; i < a->num_writers; i++)
1094 if (s->wns && s->wns[i].task.error >= 0)
1095 return;
1096 } else {
1097 if (s->wns && s->wns[0].task.error >= 0)
1098 return;
1099 }
1100 PARA_INFO_LOG("closing slot %d\n", slot_num);
1101 close_writers(s);
1102 close_filters(s);
1103 close_receiver(slot_num);
1104 clear_slot(slot_num);
1105 }
1106
1107 /*
1108 * Check if any receivers/filters/writers need to be started and do so if
1109 * necessary.
1110 */
1111 static void start_stop_decoders(void)
1112 {
1113 int i, ret;
1114 struct slot_info *sl;
1115 struct audio_format_info *a;
1116
1117 FOR_EACH_SLOT(i)
1118 try_to_close_slot(i);
1119 if (audiod_status != AUDIOD_ON ||
1120 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1121 return kill_all_decoders(-E_NOT_PLAYING);
1122 if (!must_start_decoder())
1123 return;
1124 ret = open_receiver(stat_task->current_audio_format_num);
1125 if (ret < 0) {
1126 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1127 return;
1128 }
1129 sl = slot + ret;
1130 a = afi + sl->format;
1131 if (a->num_filters)
1132 open_filters(sl);
1133 open_writers(sl);
1134 activate_grab_clients();
1135 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1136 }
1137
1138 static void status_pre_select(struct sched *s, struct task *t)
1139 {
1140 struct status_task *st = container_of(t, struct status_task, task);
1141 int ret, cafn = stat_task->current_audio_format_num;
1142
1143 if (must_start_decoder())
1144 goto min_delay;
1145 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1146 if (ret > 0)
1147 goto min_delay;
1148 if (st->ct && audiod_status == AUDIOD_OFF)
1149 goto min_delay;
1150 if (!st->ct && audiod_status != AUDIOD_OFF)
1151 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1152 if (cafn >= 0)
1153 sched_request_barrier(&afi[cafn].restart_barrier, s);
1154 /*
1155 * If para_server is playing we'd like to have a smooth time display
1156 * even if we are running in standby mode. So we request a timeout that
1157 * expires at the next full second.
1158 */
1159 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1160 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1161 return;
1162 min_delay:
1163 sched_min_delay(s);
1164 }
1165
1166 /* restart the client task if necessary */
1167 static void status_post_select(__a_unused struct sched *s, struct task *t)
1168 {
1169 struct status_task *st = container_of(t, struct status_task, task);
1170
1171 if (audiod_status == AUDIOD_OFF) {
1172 if (!st->ct)
1173 goto out;
1174 if (st->ct->task.error >= 0) {
1175 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1176 goto out;
1177 }
1178 if (st->ct->task.error >= 0)
1179 goto out;
1180 close_stat_pipe();
1181 st->clock_diff_count = conf.clock_diff_count_arg;
1182 goto out;
1183 }
1184 if (st->ct) {
1185 char *buf;
1186 size_t sz;
1187 int ret;
1188 if (st->ct->task.error < 0) {
1189 if (st->ct->task.error >= 0)
1190 goto out;
1191 close_stat_pipe();
1192 goto out;
1193 }
1194 if (st->ct->status != CL_RECEIVING)
1195 goto out;
1196 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1197 if (ret <= 0) {
1198 struct timeval diff;
1199 tv_diff(now, &st->last_status_read, &diff);
1200 if (diff.tv_sec > 61)
1201 kill_btrn(st->ct->btrn, &st->ct->task,
1202 -E_STATUS_TIMEOUT);
1203 goto out;
1204 }
1205 btr_merge(st->btrn, st->min_iqs);
1206 sz = btr_next_buffer(st->btrn, &buf);
1207 ret = for_each_stat_item(buf, sz, update_item);
1208 if (ret < 0) {
1209 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1210 goto out;
1211 }
1212 if (sz != ret) {
1213 btr_consume(st->btrn, sz - ret);
1214 st->last_status_read = *now;
1215 st->min_iqs = 0;
1216 } else /* current status item crosses buffers */
1217 st->min_iqs = sz + 1;
1218 goto out;
1219 }
1220 btr_drain(st->btrn);
1221 st->current_audio_format_num = -1;
1222 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1223 goto out;
1224 if (st->clock_diff_count) { /* get status only one time */
1225 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1226 int argc = 5;
1227 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1228 st->clock_diff_count--;
1229 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1230 set_stat_task_restart_barrier(2);
1231
1232 } else {
1233 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1234 int argc = 4;
1235 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1236 set_stat_task_restart_barrier(5);
1237 }
1238 free(stat_item_values[SI_BASENAME]);
1239 stat_item_values[SI_BASENAME] = para_strdup(
1240 "no connection to para_server");
1241 stat_client_write_item(SI_BASENAME);
1242 st->last_status_read = *now;
1243 out:
1244 start_stop_decoders();
1245 }
1246
1247 static void init_status_task(struct status_task *st)
1248 {
1249 memset(st, 0, sizeof(struct status_task));
1250 st->task.pre_select = status_pre_select;
1251 st->task.post_select = status_post_select;
1252 st->sa_time_diff_sign = 1;
1253 st->clock_diff_count = conf.clock_diff_count_arg;
1254 st->current_audio_format_num = -1;
1255 sprintf(st->task.status, "stat");
1256 st->btrn = btr_new_node(&(struct btr_node_description)
1257 EMBRACE(.name = "stat"));
1258 }
1259
1260 static void set_initial_status(void)
1261 {
1262 audiod_status = AUDIOD_ON;
1263 if (!conf.mode_given)
1264 return;
1265 if (!strcmp(conf.mode_arg, "sb")) {
1266 audiod_status = AUDIOD_STANDBY;
1267 return;
1268 }
1269 if (!strcmp(conf.mode_arg, "off")) {
1270 audiod_status = AUDIOD_OFF;
1271 return;
1272 }
1273 if (strcmp(conf.mode_arg, "on"))
1274 PARA_WARNING_LOG("invalid mode\n");
1275 }
1276
1277 __noreturn static void print_help_and_die(void)
1278 {
1279 int d = conf.detailed_help_given;
1280 const char **p = d? audiod_args_info_detailed_help
1281 : audiod_args_info_help;
1282
1283 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1284 AUDIOD_CMDLINE_PARSER_VERSION);
1285 printf_or_die("%s\n\n", audiod_args_info_usage);
1286 for (; *p; p++)
1287 printf_or_die("%s\n", *p);
1288 print_receiver_helps(d);
1289 print_filter_helps(d);
1290 print_writer_helps(d);
1291 exit(0);
1292 }
1293
1294 static void init_colors_or_die(void)
1295 {
1296 int i;
1297
1298 if (!want_colors())
1299 return;
1300 daemon_set_default_log_colors();
1301 daemon_set_flag(DF_COLOR_LOG);
1302 for (i = 0; i < conf.log_color_given; i++)
1303 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1304 }
1305
1306 /**
1307 * the main function of para_audiod
1308 *
1309 * \param argc usual argument count
1310 * \param argv usual argument vector
1311 *
1312 * \return EXIT_SUCCESS or EXIT_FAILURE
1313 *
1314 * \sa para_audiod(1)
1315 * */
1316 int main(int argc, char *argv[])
1317 {
1318 int ret, i;
1319 static struct sched s;
1320 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1321 struct audiod_cmdline_parser_params params = {
1322 .override = 0,
1323 .initialize = 1,
1324 .check_required = 0,
1325 .check_ambiguity = 0,
1326 .print_errors = 1
1327 };
1328
1329 valid_fd_012();
1330 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1331 exit(EXIT_FAILURE);
1332 HANDLE_VERSION_FLAG("audiod", conf);
1333 /* init receivers/filters/writers early to make help work */
1334 recv_init();
1335 filter_init();
1336 writer_init();
1337 if (conf.help_given || conf.detailed_help_given)
1338 print_help_and_die();
1339 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1340 parse_config_or_die();
1341 init_colors_or_die();
1342 init_random_seed_or_die();
1343 daemon_set_flag(DF_LOG_TIME);
1344 daemon_set_flag(DF_LOG_HOSTNAME);
1345 daemon_set_flag(DF_LOG_LL);
1346 if (conf.log_timing_given)
1347 daemon_set_flag(DF_LOG_TIMING);
1348 if (conf.logfile_given) {
1349 daemon_set_logfile(conf.logfile_arg);
1350 daemon_open_log_or_die();
1351 }
1352 ret = parse_stream_args();
1353 if (ret < 0) {
1354 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1355 exit(EXIT_FAILURE);
1356 }
1357 log_welcome("para_audiod");
1358 server_uptime(UPTIME_SET);
1359 set_initial_status();
1360 FOR_EACH_SLOT(i)
1361 clear_slot(i);
1362 setup_signal_handling();
1363 signal_setup_default(sig_task);
1364
1365 init_status_task(stat_task);
1366 init_command_task(cmd_task);
1367
1368 if (conf.daemon_given)
1369 daemonize();
1370
1371 register_task(&sig_task->task);
1372 register_task(&cmd_task->task);
1373 register_task(&stat_task->task);
1374 s.default_timeout.tv_sec = 2;
1375 s.default_timeout.tv_usec = 999 * 1000;
1376 ret = schedule(&s);
1377
1378 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1379 return EXIT_FAILURE;
1380 }