Merge commit 'meins/master'
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file audiod.c the paraslash's audio daemon */
8 #include <regex.h>
9 #include <sys/types.h>
10 #include <dirent.h>
11 #include <signal.h>
12 #include <openssl/rc4.h>
13
14 #include "para.h"
15 #include "error.h"
16 #include "crypt.h"
17 #include "audiod.cmdline.h"
18 #include "list.h"
19 #include "sched.h"
20 #include "ggo.h"
21 #include "recv.h"
22 #include "filter.h"
23 #include "grab_client.h"
24 #include "client.cmdline.h"
25 #include "client.h"
26 #include "audiod.h"
27 #include "net.h"
28 #include "daemon.h"
29 #include "string.h"
30 #include "fd.h"
31 #include "write.h"
32 #include "write_common.h"
33 #include "signal.h"
34
35 /** define the array of error lists needed by para_audiod */
36 INIT_AUDIOD_ERRLISTS;
37 /** define the array containing all supported audio formats */
38 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
39
40 /** Defines how audiod handles one supported audio format. */
41 struct audio_format_info {
42 /** pointer to the receiver for this audio format */
43 struct receiver *receiver;
44 /** the receiver configuration */
45 void *receiver_conf;
46 /** the number of filters that should be activated for this audio format */
47 unsigned int num_filters;
48 /** Array of filter numbers to be activated. */
49 unsigned *filter_nums;
50 /** Pointer to the array of filter configurations. */
51 void **filter_conf;
52 /** the number of filters that should be activated for this audio format */
53 unsigned int num_writers;
54 /** Array of writer numbers to be activated. */
55 int *writer_nums;
56 /** pointer to the array of writer configurations */
57 void **writer_conf;
58 /** do not start receiver/filters/writer before this time */
59 struct timeval restart_barrier;
60 };
61
62 /**
63 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
64 * be associated with a receiver/filter/writer triple. This array holds all
65 * information on the status of these slots.
66 *
67 * \sa struct slot_info
68 * */
69 struct slot_info slot[MAX_STREAM_SLOTS];
70
71 /** The vss status flags audiod is interested in. */
72 enum vss_status_flags {
73 /** Whether the 'N' flag is set. */
74 VSS_STATUS_FLAG_NEXT = 1,
75 /** The 'P' flag is set. */
76 VSS_STATUS_FLAG_PLAYING = 2,
77 };
78
79 /**
80 * The task for obtaining para_server's status (para_client stat).
81 *
82 * \sa struct task, struct sched.
83 */
84 struct status_task {
85 /** The associated task structure of audiod. */
86 struct task task;
87 /** Client data associated with the stat task. */
88 struct client_task *ct;
89 /** Do not restart client command until this time. */
90 struct timeval restart_barrier;
91 /** Last time we received status data from para_server. */
92 struct timeval last_status_read;
93 /** The offset value announced by para_server. */
94 int offset_seconds;
95 /** The length of the current audio file as announced by para_server. */
96 int length_seconds;
97 /** The start of the current stream from the view of para_server. */
98 struct timeval server_stream_start;
99 /** The average time deviation between para_server and para_audiod. */
100 struct timeval sa_time_diff;
101 /** Whether client time is ahead of server time. */
102 int sa_time_diff_sign;
103 /** The 'P' and the 'N' flags as announced by para_server. */
104 enum vss_status_flags vss_status;
105 /** Number of times the clock difference is to be checked. */
106 unsigned clock_diff_count;
107 /** When to start the next check for clock difference. */
108 struct timeval clock_diff_barrier;
109 /** Number of the audio format as announced by para_server. */
110 int current_audio_format_num;
111 };
112
113 /** The array of status items sent by para_server. */
114 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
115
116 /**
117 * the current mode of operation of which can be changed by the on/off/cycle
118 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
119 */
120 int audiod_status = AUDIOD_ON;
121
122 /**
123 * the gengetopt args_info struct that holds information on all command line
124 * arguments
125 */
126 struct audiod_args_info conf;
127
128 static char *socket_name;
129 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
130
131 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
132
133 static struct status_task status_task_struct;
134
135 /**
136 * the task that calls the status command of para_server
137 *
138 * \sa struct status_task
139 */
140 static struct status_task *stat_task = &status_task_struct;
141 static struct timeval initial_delay_barrier;
142
143 /**
144 * the task for handling audiod commands
145 *
146 * \sa struct task, struct sched
147 */
148 struct command_task {
149 /** the local listening socket */
150 int fd;
151 /** the associated task structure */
152 struct task task;
153 };
154
155 /** iterate over all supported audio formats */
156 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
157
158 /**
159 * get the audio format number
160 * \param name the name of the audio format
161 *
162 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
163 * \a name is not a supported audio format.
164 */
165 int get_audio_format_num(const char *name)
166 {
167 int i;
168
169 while (para_isspace(*name))
170 name++;
171 FOR_EACH_AUDIO_FORMAT(i)
172 if (!strcmp(name, audio_formats[i]))
173 return i;
174 return -E_UNSUPPORTED_AUDIO_FORMAT;
175 }
176
177 char *get_time_string(int slot_num)
178 {
179 int ret, seconds = 0, length;
180 struct timeval *tmp, sum, sss, /* server stream start */
181 wtime, /* now - writer start */
182 rskip; /* receiver start - sss */
183 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
184
185 if (audiod_status == AUDIOD_OFF)
186 goto empty;
187 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
188 if (stat_task->length_seconds) /* paused */
189 return NULL;
190 goto empty; /* stopped */
191 }
192 if (audiod_status == AUDIOD_ON && !s)
193 goto empty;
194 /* valid status items and playing */
195 if (s) { /* writer active in this slot */
196 length = s->seconds_total;
197 tmp = &s->server_stream_start;
198 } else { /* standby mode, rely on status items */
199 length = stat_task->length_seconds;
200 tmp = &stat_task->server_stream_start;
201 }
202 if (stat_task->sa_time_diff_sign > 0)
203 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
204 else
205 tv_add(tmp, &stat_task->sa_time_diff, &sss);
206 if (!s) {
207 struct timeval diff;
208 tv_diff(now, &sss, &diff);
209 seconds = diff.tv_sec + stat_task->offset_seconds;
210 goto out;
211 }
212 tv_diff(now, &s->wstime, &wtime);
213 seconds = s->offset_seconds;
214 ret = tv_diff(&s->rstime, &sss, &rskip);
215 if (ret > 0) { /* audiod was started in the middle of the stream */
216 tv_add(&wtime, &rskip, &sum);
217 seconds += sum.tv_sec;
218 } else
219 seconds += wtime.tv_sec;
220 out:
221 seconds = PARA_MIN(seconds, length);
222 seconds = PARA_MAX(seconds, 0);
223 return make_message(
224 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
225 s? "" : "~",
226 seconds / 60,
227 seconds % 60,
228 (length - seconds) / 60,
229 (length - seconds) % 60,
230 length? (seconds * 100 + length / 2) / length : 0,
231 length / 60,
232 length % 60
233 );
234 empty:
235 return para_strdup(NULL);
236 }
237
238 static int want_colors(void)
239 {
240 if (conf.color_arg == color_arg_no)
241 return 0;
242 if (conf.color_arg == color_arg_yes)
243 return 1;
244 if (conf.logfile_given)
245 return 0;
246 return isatty(STDERR_FILENO);
247 }
248
249 static void parse_config_or_die(void)
250 {
251 int ret;
252 char *config_file;
253 struct audiod_cmdline_parser_params params = {
254 .override = 0,
255 .initialize = 0,
256 .check_required = 1,
257 .check_ambiguity = 0,
258 .print_errors = 1
259 };
260
261 if (conf.config_file_given)
262 config_file = para_strdup(conf.config_file_arg);
263 else {
264 char *home = para_homedir();
265 config_file = make_message("%s/.paraslash/audiod.conf", home);
266 free(home);
267 }
268 ret = file_exists(config_file);
269 if (conf.config_file_given && !ret) {
270 PARA_EMERG_LOG("can not read config file %s\n", config_file);
271 goto err;
272 }
273 if (ret)
274 audiod_cmdline_parser_config_file(config_file, &conf, &params);
275 free(config_file);
276 daemon_set_loglevel(conf.loglevel_arg);
277 return;
278 err:
279 free(config_file);
280 exit(EXIT_FAILURE);
281 }
282
283 static void setup_signal_handling(void)
284 {
285 sig_task->fd = para_signal_init();
286 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
287 para_install_sighandler(SIGINT);
288 para_install_sighandler(SIGTERM);
289 para_install_sighandler(SIGHUP);
290 para_sigaction(SIGPIPE, SIG_IGN);
291 }
292
293 static void clear_slot(int slot_num)
294 {
295 struct slot_info *s = &slot[slot_num];
296
297 PARA_INFO_LOG("clearing slot %d\n", slot_num);
298 memset(s, 0, sizeof(struct slot_info));
299 s->format = -1;
300 }
301
302 static void close_receiver(int slot_num)
303 {
304 struct slot_info *s = &slot[slot_num];
305 struct audio_format_info *a;
306
307 if (s->format < 0 || !s->receiver_node)
308 return;
309 a = &afi[s->format];
310 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
311 audio_formats[s->format], slot_num);
312 a->receiver->close(s->receiver_node);
313 free(s->receiver_node);
314 s->receiver_node = NULL;
315 stat_task->current_audio_format_num = -1;
316 }
317
318 static void kill_all_decoders(int error)
319 {
320 int i;
321
322 FOR_EACH_SLOT(i) {
323 struct slot_info *s = &slot[i];
324 if (s->wng && s->wng->task.error >= 0) {
325 PARA_INFO_LOG("deactivating wng in slot %d\n",
326 i);
327 s->wng->task.error = error;
328 }
329 if (s->fc && s->fc->task.error >= 0) {
330 PARA_INFO_LOG("deactivatimg filter chain in slot %d\n", i);
331 s->fc->task.error = error;
332 }
333 if (s->receiver_node && s->receiver_node->task.error >= 0) {
334 PARA_INFO_LOG("deactivating receiver_node in slot %d\n", i);
335 s->receiver_node->task.error = error;
336 }
337 }
338 }
339
340 static int get_empty_slot(void)
341 {
342 int i;
343 struct slot_info *s;
344
345 FOR_EACH_SLOT(i) {
346 s = &slot[i];
347 if (s->format < 0) {
348 clear_slot(i);
349 return i;
350 }
351 if (s->wng || s->receiver_node || s->fc)
352 continue;
353 clear_slot(i);
354 return i;
355 }
356 return -E_NO_MORE_SLOTS;
357 }
358
359 /**
360 * get the number of filters
361 *
362 * \param audio_format_num the number identifying the audio format
363 *
364 * \return the number of filters for the given audio format
365 *
366 * \sa struct filter;
367 */
368 int num_filters(int audio_format_num)
369 {
370 return afi[audio_format_num].num_filters;
371 }
372
373 static void open_filters(int slot_num)
374 {
375 struct slot_info *s = &slot[slot_num];
376 struct audio_format_info *a = &afi[s->format];
377 struct filter_node *fn;
378 int nf = a->num_filters;
379 int i;
380
381 s->fc = NULL;
382 if (!nf)
383 return;
384 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
385 s->fc = para_calloc(sizeof(struct filter_chain));
386 s->fc->filter_nodes = para_malloc(nf * sizeof(struct filter_node));
387 s->fc->inbufp = &s->receiver_node->buf;
388 s->fc->in_loaded = &s->receiver_node->loaded;
389 s->fc->input_error = &s->receiver_node->task.error;
390 s->fc->task.pre_select = NULL;
391 s->fc->task.post_select = filter_post_select;
392 s->fc->task.error = 0;
393 s->fc->num_filters = nf;
394
395 s->receiver_node->output_error = &s->fc->task.error;
396 sprintf(s->fc->task.status, "filter chain");
397 FOR_EACH_FILTER_NODE(fn, s->fc, i) {
398 struct filter *f = filters + a->filter_nums[i];
399 fn->filter_num = a->filter_nums[i];
400 fn->conf = a->filter_conf[i];
401 fn->fc = s->fc;
402 fn->loaded = 0;
403 INIT_LIST_HEAD(&fn->callbacks);
404 f->open(fn);
405 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
406 audio_formats[s->format], i, nf, f->name, slot_num);
407 s->fc->outbufp = &fn->buf;
408 s->fc->out_loaded = &fn->loaded;
409 }
410 register_task(&s->fc->task);
411 }
412
413 static void open_writers(int slot_num)
414 {
415 int ret, i;
416 struct slot_info *s = &slot[slot_num];
417 struct audio_format_info *a = &afi[s->format];
418
419 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
420 if (!a->num_writers)
421 s->wng = setup_default_wng();
422 else
423 s->wng = wng_new(a->num_writers);
424 if (s->fc) {
425 s->wng->bufp = s->fc->outbufp;
426 s->wng->loaded = s->fc->out_loaded;
427 s->wng->input_error = &s->fc->task.error;
428 s->wng->channels = &s->fc->channels;
429 s->wng->samplerate = &s->fc->samplerate;
430 s->fc->output_error = &s->wng->task.error;
431 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
432 } else {
433 s->wng->bufp = &s->receiver_node->buf;
434 s->wng->loaded = &s->receiver_node->loaded;
435 s->wng->input_error = &s->receiver_node->task.error;
436 }
437 for (i = 0; i < a->num_writers; i++) {
438 s->wng->writer_nodes[i].conf = a->writer_conf[i];
439 s->wng->writer_nodes[i].writer_num = a->writer_nums[i];
440 }
441 ret = wng_open(s->wng);
442 if (ret < 0)
443 return;
444 s->wstime = *now;
445 s->server_stream_start = stat_task->server_stream_start.tv_sec?
446 stat_task->server_stream_start : *now;
447 s->offset_seconds = stat_task->offset_seconds;
448 s->seconds_total = stat_task->length_seconds;
449 activate_inactive_grab_clients(s->format, s->fc);
450 }
451
452 static int open_receiver(int format)
453 {
454 struct audio_format_info *a = &afi[format];
455 struct slot_info *s;
456 int ret, slot_num;
457 struct receiver_node *rn;
458 const struct timeval restart_delay = {2, 0};
459
460 ret = get_empty_slot();
461 if (ret < 0)
462 goto err;
463 slot_num = ret;
464 s = &slot[slot_num];
465 s->format = format;
466 s->receiver_node = para_calloc(sizeof(struct receiver_node));
467 rn = s->receiver_node;
468 rn->receiver = a->receiver;
469 rn->conf = a->receiver_conf;
470 ret = a->receiver->open(s->receiver_node);
471 if (ret < 0) {
472 free(s->receiver_node);
473 s->receiver_node = NULL;
474 goto err;
475 }
476 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
477 audio_formats[s->format], a->receiver->name, slot_num);
478 rn->task.pre_select = a->receiver->pre_select;
479 rn->task.post_select = a->receiver->post_select;
480 s->rstime = *now;
481 sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
482 register_task(&rn->task);
483 ret = 1;
484 err:
485 if (ret < 0)
486 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
487 tv_add(now, &restart_delay, &afi[format].restart_barrier);
488 return ret;
489 }
490
491 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
492 static int receiver_running(int format)
493 {
494 int i, ret = 0;
495
496 FOR_EACH_SLOT(i) {
497 struct slot_info *s = &slot[i];
498 if (s->format != format)
499 continue;
500 if (!s->receiver_node)
501 continue;
502 if (s->receiver_node->task.error >= 0)
503 return 1;
504 ret = -1;
505 }
506 return ret;
507 }
508
509 static void open_current_receiver(struct sched *s)
510 {
511 struct timeval diff;
512 int ret, cafn = stat_task->current_audio_format_num;
513
514 if (cafn < 0 || !stat_task->ct)
515 return;
516 /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
517 if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
518 return;
519 ret = receiver_running(cafn);
520 if (ret > 0) /* already running and not eof */
521 return;
522 if (ret < 0) { /* eof */
523 /*
524 * para_server uses a zero start time during the announcement
525 * period, i.e. before it sends the first chunk. Wait until
526 * this period begins to avoid restarting the receiver that
527 * belongs to the file just completed.
528 */
529 if (stat_task->server_stream_start.tv_sec)
530 return;
531 }
532 if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
533 /* avoid busy loop */
534 s->timeout = diff;
535 return;
536 }
537 /* start a new receiver */
538 open_receiver(cafn);
539 }
540
541 static unsigned compute_time_diff(const struct timeval *status_time)
542 {
543 struct timeval tmp, diff;
544 static unsigned count;
545 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
546 const struct timeval max_deviation = {0, 500 * 1000};
547 const int time_smooth = 5;
548
549 if (!status_time)
550 return count;
551 sign = tv_diff(status_time, now, &diff);
552 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
553 // sign, sa_time_diff_sign);
554 if (!count) {
555 sa_time_diff_sign = sign;
556 stat_task->sa_time_diff = diff;
557 count++;
558 goto out;
559 }
560 if (count > 5) {
561 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
562 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
563 PARA_WARNING_LOG("time diff jump: %lims\n",
564 s * tv2ms(&tmp));
565 }
566 count++;
567 sa_time_diff_sign = tv_convex_combination(
568 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
569 count > 10? sign : sign * time_smooth, &diff,
570 &tmp);
571 stat_task->sa_time_diff = tmp;
572 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
573 sign > 0? "+" : "-",
574 tv2ms(&diff),
575 sa_time_diff_sign ? "+" : "-",
576 tv2ms(&stat_task->sa_time_diff)
577 );
578 out:
579 stat_task->sa_time_diff_sign = sa_time_diff_sign;
580 return count;
581 }
582
583 static int update_item(int itemnum, char *buf)
584 {
585 long unsigned sec, usec;
586
587 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
588 return 1;
589 free(stat_item_values[itemnum]);
590 stat_item_values[itemnum] = para_strdup(buf);
591 stat_client_write_item(itemnum);
592 switch (itemnum) {
593 case SI_STATUS_FLAGS:
594 stat_task->vss_status = 0;
595 if (strchr(buf, 'N'))
596 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
597 if (strchr(buf, 'P'))
598 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
599 break;
600 case SI_OFFSET:
601 stat_task->offset_seconds = atoi(buf);
602 break;
603 case SI_SECONDS_TOTAL:
604 stat_task->length_seconds = atoi(buf);
605 break;
606 case SI_STREAM_START:
607 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
608 struct timeval a_start, delay;
609 delay.tv_sec = conf.stream_delay_arg / 1000;
610 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
611 stat_task->server_stream_start.tv_sec = sec;
612 stat_task->server_stream_start.tv_usec = usec;
613 if (compute_time_diff(NULL) > 2) {
614 if (stat_task->sa_time_diff_sign < 0)
615 tv_add(&stat_task->server_stream_start,
616 &stat_task->sa_time_diff, &a_start);
617 else
618 tv_diff(&stat_task->server_stream_start,
619 &stat_task->sa_time_diff, &a_start);
620 tv_add(&a_start, &delay, &initial_delay_barrier);
621 }
622 }
623 break;
624 case SI_CURRENT_TIME:
625 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
626 struct timeval tv = {sec, usec};
627 compute_time_diff(&tv);
628 }
629 break;
630 case SI_FORMAT:
631 stat_task->current_audio_format_num
632 = get_audio_format_num(buf);
633 }
634 return 1;
635 }
636
637 static int parse_stream_command(const char *txt, char **cmd)
638 {
639 char *p = strchr(txt, ':');
640 int i;
641
642 if (!p)
643 return -E_MISSING_COLON;
644 p++;
645 FOR_EACH_AUDIO_FORMAT(i) {
646 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
647 continue;
648 *cmd = p;
649 return i;
650 }
651 return -E_UNSUPPORTED_AUDIO_FORMAT;
652 }
653
654 static int add_filter(int format, char *cmdline)
655 {
656 struct audio_format_info *a = &afi[format];
657 int filter_num, nf = a->num_filters;
658
659 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
660 if (filter_num < 0)
661 return filter_num;
662 a->filter_nums[nf] = filter_num;
663 a->num_filters++;
664 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
665 filters[filter_num].name);
666 return filter_num;
667 }
668
669 static int parse_writer_args(void)
670 {
671 int i, ret, nw;
672 char *cmd;
673 struct audio_format_info *a;
674
675 nw = PARA_MAX(1U, conf.writer_given);
676 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
677 FOR_EACH_AUDIO_FORMAT(i) {
678 a = &afi[i];
679 a->writer_conf = para_malloc(nw * sizeof(void *));
680 a->writer_nums = para_malloc(nw * sizeof(int));
681 a->num_writers = 0;
682 }
683 for (i = 0; i < conf.writer_given; i++) {
684 void *wconf;
685 int writer_num;
686 ret = parse_stream_command(conf.writer_arg[i], &cmd);
687 if (ret < 0)
688 goto out;
689 a = &afi[ret];
690 nw = a->num_writers;
691 wconf = check_writer_arg(cmd, &writer_num);
692 if (!wconf) {
693 ret = writer_num;
694 goto out;
695 }
696 a->writer_nums[nw] = writer_num;
697 a->writer_conf[nw] = wconf;
698 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
699 nw, writer_names[writer_num]);
700 a->num_writers++;
701 }
702 ret = 1;
703 out:
704 return ret;
705 }
706
707 static int parse_receiver_args(void)
708 {
709 int i, ret, receiver_num;
710 char *cmd = NULL;
711 struct audio_format_info *a;
712
713 for (i = conf.receiver_given - 1; i >= 0; i--) {
714 char *arg = conf.receiver_arg[i];
715 char *recv_arg = strchr(arg, ':');
716 ret = -E_MISSING_COLON;
717 if (!recv_arg)
718 goto out;
719 *recv_arg = '\0';
720 recv_arg++;
721 ret = get_audio_format_num(arg);
722 if (ret < 0)
723 goto out;
724 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
725 if (!afi[ret].receiver_conf) {
726 ret = -E_RECV_SYNTAX;
727 goto out;
728 }
729 afi[ret].receiver = &receivers[receiver_num];
730 }
731 /* use the first available receiver with no arguments
732 * for those audio formats for which no receiver
733 * was specified
734 */
735 cmd = para_strdup(receivers[0].name);
736 FOR_EACH_AUDIO_FORMAT(i) {
737 a = &afi[i];
738 if (a->receiver_conf)
739 continue;
740 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
741 if (!a->receiver_conf)
742 return -E_RECV_SYNTAX;
743 a->receiver = &receivers[receiver_num];
744 }
745 ret = 1;
746 out:
747 free(cmd);
748 return ret;
749 }
750
751 static int init_default_filters(void)
752 {
753 int i, ret = 1;
754
755 FOR_EACH_AUDIO_FORMAT(i) {
756 struct audio_format_info *a = &afi[i];
757 char *tmp;
758 int j;
759
760 if (a->num_filters)
761 continue; /* no default -- nothing to to */
762 /* add "dec" to audio format name */
763 tmp = make_message("%sdec", audio_formats[i]);
764 for (j = 0; filters[j].name; j++)
765 if (!strcmp(tmp, filters[j].name))
766 break;
767 free(tmp);
768 ret = -E_UNSUPPORTED_FILTER;
769 if (!filters[j].name)
770 goto out;
771 tmp = para_strdup(filters[j].name);
772 ret = add_filter(i, tmp);
773 free(tmp);
774 if (ret < 0)
775 goto out;
776 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
777 filters[j].name);
778 }
779 out:
780 return ret;
781 }
782
783 static int parse_filter_args(void)
784 {
785 int i, ret, nf;
786
787 nf = PARA_MAX(1U, conf.filter_given);
788 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
789 FOR_EACH_AUDIO_FORMAT(i) {
790 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
791 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
792 }
793 if (!conf.no_default_filters_given)
794 return init_default_filters();
795 for (i = 0; i < conf.filter_given; i++) {
796 char *arg = conf.filter_arg[i];
797 char *filter_name = strchr(arg, ':');
798 ret = -E_MISSING_COLON;
799 if (!filter_name)
800 goto out;
801 *filter_name = '\0';
802 filter_name++;
803 ret = get_audio_format_num(arg);
804 if (ret < 0)
805 goto out;
806 ret = add_filter(ret, filter_name);
807 if (ret < 0)
808 goto out;
809 }
810 ret = init_default_filters(); /* use default values for the rest */
811 out:
812 return ret;
813 }
814
815 static int parse_stream_args(void)
816 {
817 int ret;
818
819 ret = parse_receiver_args();
820 if (ret < 0)
821 return ret;
822 ret = parse_filter_args();
823 if (ret < 0)
824 return ret;
825 ret = parse_writer_args();
826 if (ret < 0)
827 return ret;
828 return 1;
829 }
830
831 /* does not unlink socket on errors */
832 static int audiod_get_socket(void)
833 {
834 struct sockaddr_un unix_addr;
835 int ret, fd;
836
837 if (conf.socket_given)
838 socket_name = para_strdup(conf.socket_arg);
839 else {
840 char *hn = para_hostname();
841 socket_name = make_message("/var/paraslash/audiod_socket.%s",
842 hn);
843 free(hn);
844 }
845 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
846 if (conf.force_given)
847 unlink(socket_name);
848 ret = create_local_socket(socket_name, &unix_addr,
849 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
850 if (ret < 0)
851 goto err;
852 fd = ret;
853 if (listen(fd , 5) < 0) {
854 ret = -ERRNO_TO_PARA_ERROR(errno);
855 goto err;
856 }
857 ret = mark_fd_nonblocking(fd);
858 if (ret < 0)
859 goto err;
860 return fd;
861 err:
862 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
863 exit(EXIT_FAILURE);
864 }
865
866 static void signal_pre_select(struct sched *s, struct task *t)
867 {
868 struct signal_task *st = container_of(t, struct signal_task, task);
869 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
870 }
871
872 static void signal_post_select(struct sched *s, struct task *t)
873 {
874 struct signal_task *st = container_of(t, struct signal_task, task);
875
876 if (!FD_ISSET(st->fd, &s->rfds))
877 return;
878
879 st->signum = para_next_signal();
880 switch (st->signum) {
881 case SIGINT:
882 case SIGTERM:
883 case SIGHUP:
884 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
885 clean_exit(EXIT_FAILURE, "caught deadly signal");
886 }
887 }
888
889 static void signal_setup_default(struct signal_task *st)
890 {
891 st->task.pre_select = signal_pre_select;
892 st->task.post_select = signal_post_select;
893 sprintf(st->task.status, "signal task");
894 }
895
896 static void command_pre_select(struct sched *s, struct task *t)
897 {
898 struct command_task *ct = container_of(t, struct command_task, task);
899 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
900 }
901
902 static void command_post_select(struct sched *s, struct task *t)
903 {
904 int ret;
905 struct command_task *ct = container_of(t, struct command_task, task);
906 static struct timeval last_status_dump;
907 struct timeval tmp;
908
909 tv_add(&last_status_dump, &(struct timeval){0, 500 * 1000}, &tmp);
910 if (tv_diff(&tmp, now, NULL) < 0) {
911 audiod_status_dump();
912 last_status_dump = *now;
913 }
914
915 if (!FD_ISSET(ct->fd, &s->rfds))
916 return;
917 ret = handle_connect(ct->fd);
918 if (ret < 0)
919 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
920 }
921
922 static void init_command_task(struct command_task *ct)
923 {
924 ct->task.pre_select = command_pre_select;
925 ct->task.post_select = command_post_select;
926 ct->task.error = 0;
927 ct->fd = audiod_get_socket(); /* doesn't return on errors */
928 sprintf(ct->task.status, "command task");
929 }
930
931 static void close_stat_pipe(void)
932 {
933 if (!stat_task->ct)
934 return;
935 client_close(stat_task->ct);
936 stat_task->ct = NULL;
937 clear_and_dump_items();
938 stat_task->length_seconds = 0;
939 stat_task->offset_seconds = 0;
940 stat_task->vss_status = 0;
941 stat_task->current_audio_format_num = -1;
942 audiod_status_dump();
943 }
944
945 /**
946 * close the connection to para_server and exit
947 *
948 * \param status the exit status which is passed to exit(3)
949 * \param msg the log message
950 *
951 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
952 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
953 * EXIT_FAILURE.
954 *
955 * \sa exit(3)
956 */
957 void __noreturn clean_exit(int status, const char *msg)
958 {
959 PARA_EMERG_LOG("%s\n", msg);
960 if (socket_name)
961 unlink(socket_name);
962 close_stat_pipe();
963 exit(status);
964 }
965
966 /* avoid busy loop if server is down */
967 static void set_stat_task_restart_barrier(unsigned seconds)
968 {
969 struct timeval delay = {seconds, 0};
970 tv_add(now, &delay, &stat_task->restart_barrier);
971 }
972
973 static void try_to_close_slot(int slot_num)
974 {
975 struct slot_info *s = &slot[slot_num];
976
977 if (s->format < 0)
978 return;
979 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
980 return;
981 if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
982 return;
983 if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
984 return;
985 PARA_INFO_LOG("closing slot %d\n", slot_num);
986 wng_close(s->wng);
987 close_filters(s->fc);
988 free(s->fc);
989 close_receiver(slot_num);
990 clear_slot(slot_num);
991 }
992
993 /*
994 * Check if any receivers/filters/writers need to be started and do so if
995 * necessary.
996 */
997 static void start_stop_decoders(struct sched *s)
998 {
999 int i;
1000
1001 FOR_EACH_SLOT(i)
1002 try_to_close_slot(i);
1003 if (audiod_status != AUDIOD_ON ||
1004 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1005 return kill_all_decoders(-E_NOT_PLAYING);
1006 open_current_receiver(s);
1007 FOR_EACH_SLOT(i) {
1008 struct slot_info *sl = &slot[i];
1009 struct audio_format_info *a;
1010 struct timeval diff;
1011
1012 if (sl->format < 0)
1013 continue;
1014 a = &afi[sl->format];
1015 if (!sl->receiver_node)
1016 continue;
1017 if ((!a->num_filters || sl->fc) && sl->wng)
1018 continue; /* everything already started */
1019 if (!a->num_filters) {
1020 if (sl->receiver_node->loaded && !sl->wng) {
1021 open_writers(i);
1022 }
1023 continue;
1024 }
1025 if (sl->receiver_node->loaded && !sl->fc) {
1026 open_filters(i);
1027 continue;
1028 }
1029 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
1030 continue;
1031 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
1032 open_writers(i);
1033 continue;
1034 }
1035 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
1036 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
1037 s->timeout = diff;
1038 }
1039 }
1040 }
1041
1042
1043 /* restart the client task if necessary */
1044 static void status_pre_select(struct sched *s, struct task *t)
1045 {
1046 struct status_task *st = container_of(t, struct status_task, task);
1047
1048 if (audiod_status == AUDIOD_OFF) {
1049 if (!st->ct)
1050 goto out;
1051 if (st->ct->task.error >= 0) {
1052 st->ct->task.error = -E_AUDIOD_OFF;
1053 goto out;
1054 }
1055 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1056 goto out;
1057 close_stat_pipe();
1058 st->clock_diff_count = conf.clock_diff_count_arg;
1059 goto out;
1060 }
1061 if (st->ct) {
1062 int ret;
1063 if (st->ct->task.error < 0) {
1064 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1065 goto out;
1066 close_stat_pipe();
1067 goto out;
1068 }
1069 if (st->ct->status != CL_RECEIVING)
1070 goto out;
1071 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1072 update_item);
1073 if (ret < 0) {
1074 st->ct->task.error = ret;
1075 goto out;
1076 }
1077 if (st->ct->loaded != ret) {
1078 st->last_status_read = *now;
1079 st->ct->loaded = ret;
1080 } else {
1081 struct timeval diff;
1082 tv_diff(now, &st->last_status_read, &diff);
1083 if (diff.tv_sec > 61)
1084 st->ct->task.error = -E_STATUS_TIMEOUT;
1085 }
1086 goto out;
1087 }
1088 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1089 goto out;
1090 if (st->clock_diff_count) { /* get status only one time */
1091 char *argv[] = {"audiod", "--", "stat", "-p", "1", NULL};
1092 int argc = 5;
1093 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1094 st->clock_diff_count--;
1095 client_open(argc, argv, &st->ct, NULL);
1096 set_stat_task_restart_barrier(2);
1097
1098 } else {
1099 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1100 int argc = 4;
1101 client_open(argc, argv, &st->ct, NULL);
1102 set_stat_task_restart_barrier(5);
1103 }
1104 free(stat_item_values[SI_BASENAME]);
1105 stat_item_values[SI_BASENAME] = para_strdup(
1106 "no connection to para_server");
1107 stat_client_write_item(SI_BASENAME);
1108 st->last_status_read = *now;
1109 out:
1110 start_stop_decoders(s);
1111 }
1112
1113 static void init_status_task(struct status_task *st)
1114 {
1115 memset(st, 0, sizeof(struct status_task));
1116 st->task.pre_select = status_pre_select;
1117 st->sa_time_diff_sign = 1;
1118 st->clock_diff_count = conf.clock_diff_count_arg;
1119 st->current_audio_format_num = -1;
1120 sprintf(st->task.status, "status task");
1121 }
1122
1123 static void set_initial_status(void)
1124 {
1125 audiod_status = AUDIOD_ON;
1126 if (!conf.mode_given)
1127 return;
1128 if (!strcmp(conf.mode_arg, "sb")) {
1129 audiod_status = AUDIOD_STANDBY;
1130 return;
1131 }
1132 if (!strcmp(conf.mode_arg, "off")) {
1133 audiod_status = AUDIOD_OFF;
1134 return;
1135 }
1136 if (strcmp(conf.mode_arg, "on"))
1137 PARA_WARNING_LOG("invalid mode\n");
1138 }
1139
1140 __noreturn static void print_help_and_die(void)
1141 {
1142 int d = conf.detailed_help_given;
1143 const char **p = d? audiod_args_info_detailed_help
1144 : audiod_args_info_help;
1145
1146 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1147 AUDIOD_CMDLINE_PARSER_VERSION);
1148 printf_or_die("%s\n\n", audiod_args_info_usage);
1149 for (; *p; p++)
1150 printf_or_die("%s\n", *p);
1151 print_receiver_helps(d);
1152 print_filter_helps(d);
1153 print_writer_helps(d);
1154 exit(0);
1155 }
1156
1157 static void init_colors_or_die(void)
1158 {
1159 int ret, i;
1160
1161 if (!want_colors())
1162 return;
1163 daemon_set_default_log_colors();
1164 daemon_set_flag(DF_COLOR_LOG);
1165 for (i = 0; i < conf.log_color_given; i++) {
1166 ret = daemon_set_log_color(conf.log_color_arg[i]);
1167 if (ret < 0)
1168 exit(EXIT_FAILURE);
1169 }
1170 }
1171
1172 /**
1173 * the main function of para_audiod
1174 *
1175 * \param argc usual argument count
1176 * \param argv usual argument vector
1177 *
1178 * \return EXIT_SUCCESS or EXIT_FAILURE
1179 *
1180 * \sa para_audiod(1)
1181 * */
1182 int main(int argc, char *argv[])
1183 {
1184 int ret, i;
1185 static struct sched s;
1186 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1187 struct audiod_cmdline_parser_params params = {
1188 .override = 0,
1189 .initialize = 1,
1190 .check_required = 0,
1191 .check_ambiguity = 0,
1192 .print_errors = 1
1193 };
1194
1195 valid_fd_012();
1196 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1197 exit(EXIT_FAILURE);
1198 HANDLE_VERSION_FLAG("audiod", conf);
1199 /* init receivers/filters/writers early to make help work */
1200 recv_init();
1201 filter_init();
1202 writer_init();
1203 if (conf.help_given || conf.detailed_help_given)
1204 print_help_and_die();
1205 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1206 parse_config_or_die();
1207 init_colors_or_die();
1208 init_random_seed_or_die();
1209 daemon_set_flag(DF_LOG_TIME);
1210 daemon_set_flag(DF_LOG_HOSTNAME);
1211 daemon_set_flag(DF_LOG_LL);
1212 if (conf.log_timing_given)
1213 daemon_set_flag(DF_LOG_TIMING);
1214 if (conf.logfile_given) {
1215 daemon_set_logfile(conf.logfile_arg);
1216 daemon_open_log_or_die();
1217 }
1218 ret = parse_stream_args();
1219 if (ret < 0) {
1220 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1221 exit(EXIT_FAILURE);
1222 }
1223 log_welcome("para_audiod");
1224 server_uptime(UPTIME_SET);
1225 set_initial_status();
1226 FOR_EACH_SLOT(i)
1227 clear_slot(i);
1228 init_grabbing();
1229 setup_signal_handling();
1230 signal_setup_default(sig_task);
1231
1232 init_status_task(stat_task);
1233 init_command_task(cmd_task);
1234
1235 if (conf.daemon_given)
1236 daemonize();
1237
1238 register_task(&sig_task->task);
1239 register_task(&cmd_task->task);
1240 register_task(&stat_task->task);
1241 s.default_timeout.tv_sec = 0;
1242 s.default_timeout.tv_usec = 999 * 1000;
1243 ret = schedule(&s);
1244
1245 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1246 return EXIT_FAILURE;
1247 }