command_util: Generate properly documented command header files.
[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 <sys/types.h>
9 #include <dirent.h>
10 #include <signal.h>
11 #include <openssl/rc4.h>
12
13 #include "para.h"
14 #include "error.h"
15 #include "crypt.h"
16 #include "audiod.cmdline.h"
17 #include "list.h"
18 #include "sched.h"
19 #include "ggo.h"
20 #include "recv.h"
21 #include "filter.h"
22 #include "grab_client.cmdline.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(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 }
316
317 static void kill_all_decoders(int error)
318 {
319 int i;
320
321 FOR_EACH_SLOT(i) {
322 struct slot_info *s = &slot[i];
323 if (s->wng && s->wng->task.error >= 0) {
324 PARA_INFO_LOG("deactivating wng in slot %d\n",
325 i);
326 s->wng->task.error = error;
327 }
328 if (s->fc && s->fc->task.error >= 0) {
329 PARA_INFO_LOG("deactivatimg filter chain in slot %d\n", i);
330 s->fc->task.error = error;
331 }
332 if (s->receiver_node && s->receiver_node->task.error >= 0) {
333 PARA_INFO_LOG("deactivating receiver_node in slot %d\n", i);
334 s->receiver_node->task.error = error;
335 }
336 }
337 }
338
339 static int get_empty_slot(void)
340 {
341 int i;
342 struct slot_info *s;
343
344 FOR_EACH_SLOT(i) {
345 s = &slot[i];
346 if (s->format < 0) {
347 clear_slot(i);
348 return i;
349 }
350 if (s->wng || s->receiver_node || s->fc)
351 continue;
352 clear_slot(i);
353 return i;
354 }
355 return -E_NO_MORE_SLOTS;
356 }
357
358 /**
359 * get the number of filters
360 *
361 * \param audio_format_num the number identifying the audio format
362 *
363 * \return the number of filters for the given audio format
364 *
365 * \sa struct filter;
366 */
367 int num_filters(int audio_format_num)
368 {
369 return afi[audio_format_num].num_filters;
370 }
371
372 static void open_filters(int slot_num)
373 {
374 struct slot_info *s = &slot[slot_num];
375 struct audio_format_info *a = &afi[s->format];
376 struct filter_node *fn;
377 int nf = a->num_filters;
378 int i;
379
380 s->fc = NULL;
381 if (!nf)
382 return;
383 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
384 s->fc = para_calloc(sizeof(struct filter_chain));
385 s->fc->filter_nodes = para_malloc(nf * sizeof(struct filter_node));
386 s->fc->inbufp = &s->receiver_node->buf;
387 s->fc->in_loaded = &s->receiver_node->loaded;
388 s->fc->input_error = &s->receiver_node->task.error;
389 s->fc->task.pre_select = filter_pre_select;
390 s->fc->task.post_select = NULL;
391 s->fc->task.error = 0;
392 s->fc->num_filters = nf;
393
394 s->receiver_node->output_error = &s->fc->task.error;
395 sprintf(s->fc->task.status, "filter chain");
396 FOR_EACH_FILTER_NODE(fn, s->fc, i) {
397 struct filter *f = filters + a->filter_nums[i];
398 fn->filter_num = a->filter_nums[i];
399 fn->conf = a->filter_conf[i];
400 fn->fc = s->fc;
401 fn->loaded = 0;
402 INIT_LIST_HEAD(&fn->callbacks);
403 f->open(fn);
404 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
405 audio_formats[s->format], i, nf, f->name, slot_num);
406 s->fc->outbufp = &fn->buf;
407 s->fc->out_loaded = &fn->loaded;
408 }
409 register_task(&s->fc->task);
410 }
411
412 static void open_writers(int slot_num)
413 {
414 int ret, i;
415 struct slot_info *s = &slot[slot_num];
416 struct audio_format_info *a = &afi[s->format];
417
418 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
419 if (!a->num_writers)
420 s->wng = setup_default_wng();
421 else
422 s->wng = wng_new(a->num_writers);
423 if (s->fc) {
424 s->wng->bufp = s->fc->outbufp;
425 s->wng->loaded = s->fc->out_loaded;
426 s->wng->input_error = &s->fc->task.error;
427 s->wng->channels = &s->fc->channels;
428 s->wng->samplerate = &s->fc->samplerate;
429 s->fc->output_error = &s->wng->task.error;
430 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
431 } else {
432 s->wng->bufp = &s->receiver_node->buf;
433 s->wng->loaded = &s->receiver_node->loaded;
434 s->wng->input_error = &s->receiver_node->task.error;
435 }
436 for (i = 0; i < a->num_writers; i++) {
437 s->wng->writer_nodes[i].conf = a->writer_conf[i];
438 s->wng->writer_nodes[i].writer_num = a->writer_nums[i];
439 }
440 ret = wng_open(s->wng);
441 if (ret < 0)
442 return;
443 s->wstime = *now;
444 s->server_stream_start = stat_task->server_stream_start.tv_sec?
445 stat_task->server_stream_start : *now;
446 s->offset_seconds = stat_task->offset_seconds;
447 s->seconds_total = stat_task->length_seconds;
448 activate_inactive_grab_clients(slot_num, s->format, s->fc);
449 }
450
451 static int open_receiver(int format)
452 {
453 struct audio_format_info *a = &afi[format];
454 struct slot_info *s;
455 int ret, slot_num;
456 struct receiver_node *rn;
457 const struct timeval restart_delay = {2, 0};
458
459 ret = get_empty_slot();
460 if (ret < 0)
461 goto err;
462 slot_num = ret;
463 s = &slot[slot_num];
464 s->format = format;
465 s->receiver_node = para_calloc(sizeof(struct receiver_node));
466 rn = s->receiver_node;
467 rn->receiver = a->receiver;
468 rn->conf = a->receiver_conf;
469 ret = a->receiver->open(s->receiver_node);
470 if (ret < 0) {
471 free(s->receiver_node);
472 s->receiver_node = NULL;
473 goto err;
474 }
475 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
476 audio_formats[s->format], a->receiver->name, slot_num);
477 rn->task.pre_select = a->receiver->pre_select;
478 rn->task.post_select = a->receiver->post_select;
479 s->rstime = *now;
480 sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
481 register_task(&rn->task);
482 ret = 1;
483 err:
484 if (ret < 0)
485 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
486 tv_add(now, &restart_delay, &afi[format].restart_barrier);
487 return ret;
488 }
489
490 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
491 static int receiver_running(int format)
492 {
493 int i, ret = 0;
494
495 FOR_EACH_SLOT(i) {
496 struct slot_info *s = &slot[i];
497 if (s->format != format)
498 continue;
499 if (!s->receiver_node)
500 continue;
501 if (s->receiver_node->task.error >= 0)
502 return 1;
503 ret = -1;
504 }
505 return ret;
506 }
507
508 static void open_current_receiver(struct sched *s)
509 {
510 struct timeval diff;
511 int ret, cafn = stat_task->current_audio_format_num;
512
513 if (cafn < 0 || !stat_task->ct)
514 return;
515 /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
516 if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
517 return;
518 ret = receiver_running(cafn);
519 if (ret > 0) /* already running and not eof */
520 return;
521 if (ret < 0) { /* eof */
522 /*
523 * para_server uses a zero start time during the announcement
524 * period, i.e. before it sends the first chunk. Wait until
525 * this period begins to avoid restarting the receiver that
526 * belongs to the file just completed.
527 */
528 if (stat_task->server_stream_start.tv_sec)
529 return;
530 }
531 if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
532 /* avoid busy loop */
533 s->timeout = diff;
534 return;
535 }
536 /* start a new receiver */
537 open_receiver(cafn);
538 }
539
540 static unsigned compute_time_diff(const struct timeval *status_time)
541 {
542 struct timeval tmp, diff;
543 static unsigned count;
544 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
545 const struct timeval max_deviation = {0, 500 * 1000};
546 const int time_smooth = 5;
547
548 if (!status_time)
549 return count;
550 sign = tv_diff(status_time, now, &diff);
551 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
552 // sign, sa_time_diff_sign);
553 if (!count) {
554 sa_time_diff_sign = sign;
555 stat_task->sa_time_diff = diff;
556 count++;
557 goto out;
558 }
559 if (count > 5) {
560 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
561 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
562 PARA_WARNING_LOG("time diff jump: %lims\n",
563 s * tv2ms(&tmp));
564 }
565 count++;
566 sa_time_diff_sign = tv_convex_combination(
567 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
568 count > 10? sign : sign * time_smooth, &diff,
569 &tmp);
570 stat_task->sa_time_diff = tmp;
571 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
572 sign > 0? "+" : "-",
573 tv2ms(&diff),
574 sa_time_diff_sign ? "+" : "-",
575 tv2ms(&stat_task->sa_time_diff)
576 );
577 out:
578 stat_task->sa_time_diff_sign = sa_time_diff_sign;
579 return count;
580 }
581
582 static int update_item(int itemnum, char *buf)
583 {
584 long unsigned sec, usec;
585
586 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
587 return 1;
588 free(stat_item_values[itemnum]);
589 stat_item_values[itemnum] = para_strdup(buf);
590 stat_client_write_item(itemnum);
591 switch (itemnum) {
592 case SI_STATUS_FLAGS:
593 stat_task->vss_status = 0;
594 if (strchr(buf, 'N'))
595 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
596 if (strchr(buf, 'P'))
597 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
598 break;
599 case SI_OFFSET:
600 stat_task->offset_seconds = atoi(buf);
601 break;
602 case SI_SECONDS_TOTAL:
603 stat_task->length_seconds = atoi(buf);
604 break;
605 case SI_STREAM_START:
606 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
607 struct timeval a_start, delay;
608 delay.tv_sec = conf.stream_delay_arg / 1000;
609 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
610 stat_task->server_stream_start.tv_sec = sec;
611 stat_task->server_stream_start.tv_usec = usec;
612 if (compute_time_diff(NULL) > 2) {
613 if (stat_task->sa_time_diff_sign < 0)
614 tv_add(&stat_task->server_stream_start,
615 &stat_task->sa_time_diff, &a_start);
616 else
617 tv_diff(&stat_task->server_stream_start,
618 &stat_task->sa_time_diff, &a_start);
619 tv_add(&a_start, &delay, &initial_delay_barrier);
620 }
621 }
622 break;
623 case SI_CURRENT_TIME:
624 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
625 struct timeval tv = {sec, usec};
626 compute_time_diff(&tv);
627 }
628 break;
629 case SI_FORMAT:
630 stat_task->current_audio_format_num
631 = get_audio_format_num(buf);
632 }
633 return 1;
634 }
635
636 static int parse_stream_command(const char *txt, char **cmd)
637 {
638 char *p = strchr(txt, ':');
639 int i;
640
641 if (!p)
642 return -E_MISSING_COLON;
643 p++;
644 FOR_EACH_AUDIO_FORMAT(i) {
645 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
646 continue;
647 *cmd = p;
648 return i;
649 }
650 return -E_UNSUPPORTED_AUDIO_FORMAT;
651 }
652
653 static int add_filter(int format, char *cmdline)
654 {
655 struct audio_format_info *a = &afi[format];
656 int filter_num, nf = a->num_filters;
657
658 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
659 if (filter_num < 0)
660 return filter_num;
661 a->filter_nums[nf] = filter_num;
662 a->num_filters++;
663 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
664 filters[filter_num].name);
665 return filter_num;
666 }
667
668 static int parse_writer_args(void)
669 {
670 int i, ret, nw;
671 char *cmd;
672 struct audio_format_info *a;
673
674 nw = PARA_MAX(1U, conf.writer_given);
675 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
676 FOR_EACH_AUDIO_FORMAT(i) {
677 a = &afi[i];
678 a->writer_conf = para_malloc(nw * sizeof(void *));
679 a->writer_nums = para_malloc(nw * sizeof(int));
680 a->num_writers = 0;
681 }
682 for (i = 0; i < conf.writer_given; i++) {
683 void *wconf;
684 int writer_num;
685 ret = parse_stream_command(conf.writer_arg[i], &cmd);
686 if (ret < 0)
687 goto out;
688 a = &afi[ret];
689 nw = a->num_writers;
690 wconf = check_writer_arg(cmd, &writer_num);
691 if (!wconf) {
692 ret = writer_num;
693 goto out;
694 }
695 a->writer_nums[nw] = writer_num;
696 a->writer_conf[nw] = wconf;
697 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
698 nw, writer_names[writer_num]);
699 a->num_writers++;
700 }
701 ret = 1;
702 out:
703 return ret;
704 }
705
706 static int parse_receiver_args(void)
707 {
708 int i, ret, receiver_num;
709 char *cmd = NULL;
710 struct audio_format_info *a;
711
712 for (i = conf.receiver_given - 1; i >= 0; i--) {
713 char *arg = conf.receiver_arg[i];
714 char *recv_arg = strchr(arg, ':');
715 ret = -E_MISSING_COLON;
716 if (!recv_arg)
717 goto out;
718 *recv_arg = '\0';
719 recv_arg++;
720 ret = get_audio_format_num(arg);
721 if (ret < 0)
722 goto out;
723 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
724 if (!afi[ret].receiver_conf) {
725 ret = -E_RECV_SYNTAX;
726 goto out;
727 }
728 afi[ret].receiver = &receivers[receiver_num];
729 }
730 /* use the first available receiver with no arguments
731 * for those audio formats for which no receiver
732 * was specified
733 */
734 cmd = para_strdup(receivers[0].name);
735 FOR_EACH_AUDIO_FORMAT(i) {
736 a = &afi[i];
737 if (a->receiver_conf)
738 continue;
739 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
740 if (!a->receiver_conf)
741 return -E_RECV_SYNTAX;
742 a->receiver = &receivers[receiver_num];
743 }
744 ret = 1;
745 out:
746 free(cmd);
747 return ret;
748 }
749
750 static int init_default_filters(void)
751 {
752 int i, ret = 1;
753
754 FOR_EACH_AUDIO_FORMAT(i) {
755 struct audio_format_info *a = &afi[i];
756 char *tmp;
757 int j;
758
759 if (a->num_filters)
760 continue; /* no default -- nothing to to */
761 /* add "dec" to audio format name */
762 tmp = make_message("%sdec", audio_formats[i]);
763 for (j = 0; filters[j].name; j++)
764 if (!strcmp(tmp, filters[j].name))
765 break;
766 free(tmp);
767 ret = -E_UNSUPPORTED_FILTER;
768 if (!filters[j].name)
769 goto out;
770 tmp = para_strdup(filters[j].name);
771 ret = add_filter(i, tmp);
772 free(tmp);
773 if (ret < 0)
774 goto out;
775 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
776 filters[j].name);
777 }
778 out:
779 return ret;
780 }
781
782 static int parse_filter_args(void)
783 {
784 int i, ret, nf;
785
786 nf = PARA_MAX(1U, conf.filter_given);
787 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
788 FOR_EACH_AUDIO_FORMAT(i) {
789 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
790 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
791 }
792 if (!conf.no_default_filters_given)
793 return init_default_filters();
794 for (i = 0; i < conf.filter_given; i++) {
795 char *arg = conf.filter_arg[i];
796 char *filter_name = strchr(arg, ':');
797 ret = -E_MISSING_COLON;
798 if (!filter_name)
799 goto out;
800 *filter_name = '\0';
801 filter_name++;
802 ret = get_audio_format_num(arg);
803 if (ret < 0)
804 goto out;
805 ret = add_filter(ret, filter_name);
806 if (ret < 0)
807 goto out;
808 }
809 ret = init_default_filters(); /* use default values for the rest */
810 out:
811 return ret;
812 }
813
814 static int parse_stream_args(void)
815 {
816 int ret;
817
818 ret = parse_receiver_args();
819 if (ret < 0)
820 return ret;
821 ret = parse_filter_args();
822 if (ret < 0)
823 return ret;
824 ret = parse_writer_args();
825 if (ret < 0)
826 return ret;
827 return 1;
828 }
829
830 /* does not unlink socket on errors */
831 static int audiod_get_socket(void)
832 {
833 struct sockaddr_un unix_addr;
834 int ret, fd;
835
836 if (conf.socket_given)
837 socket_name = para_strdup(conf.socket_arg);
838 else {
839 char *hn = para_hostname();
840 socket_name = make_message("/var/paraslash/audiod_socket.%s",
841 hn);
842 free(hn);
843 }
844 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
845 if (conf.force_given)
846 unlink(socket_name);
847 ret = create_local_socket(socket_name, &unix_addr,
848 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
849 if (ret < 0)
850 goto err;
851 fd = ret;
852 if (listen(fd , 5) < 0) {
853 ret = -ERRNO_TO_PARA_ERROR(errno);
854 goto err;
855 }
856 ret = mark_fd_nonblocking(fd);
857 if (ret < 0)
858 goto err;
859 return fd;
860 err:
861 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
862 exit(EXIT_FAILURE);
863 }
864
865 static void signal_pre_select(struct sched *s, struct task *t)
866 {
867 struct signal_task *st = container_of(t, struct signal_task, task);
868 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
869 }
870
871 static void signal_post_select(struct sched *s, struct task *t)
872 {
873 struct signal_task *st = container_of(t, struct signal_task, task);
874
875 if (!FD_ISSET(st->fd, &s->rfds))
876 return;
877
878 st->signum = para_next_signal();
879 switch (st->signum) {
880 case SIGINT:
881 case SIGTERM:
882 case SIGHUP:
883 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
884 clean_exit(EXIT_FAILURE, "caught deadly signal");
885 }
886 }
887
888 static void signal_setup_default(struct signal_task *st)
889 {
890 st->task.pre_select = signal_pre_select;
891 st->task.post_select = signal_post_select;
892 sprintf(st->task.status, "signal task");
893 }
894
895 static void command_pre_select(struct sched *s, struct task *t)
896 {
897 struct command_task *ct = container_of(t, struct command_task, task);
898 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
899 }
900
901 static void command_post_select(struct sched *s, struct task *t)
902 {
903 int ret;
904 struct command_task *ct = container_of(t, struct command_task, task);
905
906 audiod_status_dump();
907 if (!FD_ISSET(ct->fd, &s->rfds))
908 return;
909 ret = handle_connect(ct->fd);
910 if (ret < 0)
911 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
912 }
913
914 static void init_command_task(struct command_task *ct)
915 {
916 ct->task.pre_select = command_pre_select;
917 ct->task.post_select = command_post_select;
918 ct->task.error = 0;
919 ct->fd = audiod_get_socket(); /* doesn't return on errors */
920 sprintf(ct->task.status, "command task");
921 }
922
923 static void close_stat_pipe(void)
924 {
925 if (!stat_task->ct)
926 return;
927 client_close(stat_task->ct);
928 stat_task->ct = NULL;
929 clear_and_dump_items();
930 stat_task->length_seconds = 0;
931 stat_task->offset_seconds = 0;
932 stat_task->vss_status = 0;
933 audiod_status_dump();
934 }
935
936 /**
937 * close the connection to para_server and exit
938 *
939 * \param status the exit status which is passed to exit(3)
940 * \param msg the log message
941 *
942 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
943 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
944 * EXIT_FAILURE.
945 *
946 * \sa exit(3)
947 */
948 void __noreturn clean_exit(int status, const char *msg)
949 {
950 PARA_EMERG_LOG("%s\n", msg);
951 if (socket_name)
952 unlink(socket_name);
953 close_stat_pipe();
954 exit(status);
955 }
956
957 /* avoid busy loop if server is down */
958 static void set_stat_task_restart_barrier(unsigned seconds)
959 {
960 struct timeval delay = {seconds, 0};
961 tv_add(now, &delay, &stat_task->restart_barrier);
962 }
963
964 static void try_to_close_slot(int slot_num)
965 {
966 struct slot_info *s = &slot[slot_num];
967
968 if (s->format < 0)
969 return;
970 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
971 return;
972 if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
973 return;
974 if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
975 return;
976 PARA_INFO_LOG("closing slot %d\n", slot_num);
977 wng_close(s->wng);
978 close_filters(s->fc);
979 free(s->fc);
980 close_receiver(slot_num);
981 clear_slot(slot_num);
982 }
983
984 /*
985 * Check if any receivers/filters/writers need to be started and do so if
986 * necessary.
987 */
988 static void start_stop_decoders(struct sched *s)
989 {
990 int i;
991
992 FOR_EACH_SLOT(i)
993 try_to_close_slot(i);
994 if (audiod_status != AUDIOD_ON ||
995 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
996 return kill_all_decoders(-E_NOT_PLAYING);
997 open_current_receiver(s);
998 FOR_EACH_SLOT(i) {
999 struct slot_info *sl = &slot[i];
1000 struct audio_format_info *a;
1001 struct timeval diff;
1002
1003 if (sl->format < 0)
1004 continue;
1005 a = &afi[sl->format];
1006 if (!sl->receiver_node)
1007 continue;
1008 if ((!a->num_filters || sl->fc) && sl->wng)
1009 continue; /* everything already started */
1010 if (!a->num_filters) {
1011 if (sl->receiver_node->loaded && !sl->wng) {
1012 open_writers(i);
1013 }
1014 continue;
1015 }
1016 if (sl->receiver_node->loaded && !sl->fc) {
1017 open_filters(i);
1018 continue;
1019 }
1020 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
1021 continue;
1022 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
1023 open_writers(i);
1024 continue;
1025 }
1026 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
1027 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
1028 s->timeout = diff;
1029 }
1030 }
1031 }
1032
1033
1034 /* restart the client task if necessary */
1035 static void status_pre_select(struct sched *s, struct task *t)
1036 {
1037 struct status_task *st = container_of(t, struct status_task, task);
1038
1039 if (audiod_status == AUDIOD_OFF) {
1040 if (!st->ct)
1041 goto out;
1042 if (st->ct->task.error >= 0) {
1043 st->ct->task.error = -E_AUDIOD_OFF;
1044 goto out;
1045 }
1046 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1047 goto out;
1048 close_stat_pipe();
1049 st->clock_diff_count = conf.clock_diff_count_arg;
1050 goto out;
1051 }
1052 if (st->ct) {
1053 int ret;
1054 if (st->ct->task.error < 0) {
1055 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1056 goto out;
1057 close_stat_pipe();
1058 goto out;
1059 }
1060 if (st->ct->status != CL_RECEIVING)
1061 goto out;
1062 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1063 update_item);
1064 if (ret < 0) {
1065 st->ct->task.error = ret;
1066 goto out;
1067 }
1068 if (st->ct->loaded != ret) {
1069 st->last_status_read = *now;
1070 st->ct->loaded = ret;
1071 } else {
1072 struct timeval diff;
1073 tv_diff(now, &st->last_status_read, &diff);
1074 if (diff.tv_sec > 61)
1075 st->ct->task.error = -E_STATUS_TIMEOUT;
1076 }
1077 goto out;
1078 }
1079 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1080 goto out;
1081 if (st->clock_diff_count) { /* get status only one time */
1082 char *argv[] = {"audiod", "--", "stat", "-p", "1", NULL};
1083 int argc = 5;
1084 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1085 st->clock_diff_count--;
1086 client_open(argc, argv, &st->ct, NULL);
1087 set_stat_task_restart_barrier(2);
1088
1089 } else {
1090 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1091 int argc = 4;
1092 client_open(argc, argv, &st->ct, NULL);
1093 set_stat_task_restart_barrier(5);
1094 }
1095 free(stat_item_values[SI_BASENAME]);
1096 stat_item_values[SI_BASENAME] = para_strdup(
1097 "no connection to para_server");
1098 stat_client_write_item(SI_BASENAME);
1099 st->last_status_read = *now;
1100 out:
1101 start_stop_decoders(s);
1102 }
1103
1104 static void init_status_task(struct status_task *st)
1105 {
1106 memset(st, 0, sizeof(struct status_task));
1107 st->task.pre_select = status_pre_select;
1108 st->sa_time_diff_sign = 1;
1109 st->clock_diff_count = conf.clock_diff_count_arg;
1110 st->current_audio_format_num = -1;
1111 sprintf(st->task.status, "status task");
1112 }
1113
1114 static void set_initial_status(void)
1115 {
1116 audiod_status = AUDIOD_ON;
1117 if (!conf.mode_given)
1118 return;
1119 if (!strcmp(conf.mode_arg, "sb")) {
1120 audiod_status = AUDIOD_STANDBY;
1121 return;
1122 }
1123 if (!strcmp(conf.mode_arg, "off")) {
1124 audiod_status = AUDIOD_OFF;
1125 return;
1126 }
1127 if (strcmp(conf.mode_arg, "on"))
1128 PARA_WARNING_LOG("invalid mode\n");
1129 }
1130
1131 __noreturn static void print_help_and_die(void)
1132 {
1133 int d = conf.detailed_help_given;
1134 const char **p = d? audiod_args_info_detailed_help
1135 : audiod_args_info_help;
1136
1137 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1138 AUDIOD_CMDLINE_PARSER_VERSION);
1139 printf_or_die("%s\n\n", audiod_args_info_usage);
1140 for (; *p; p++)
1141 printf_or_die("%s\n", *p);
1142 print_receiver_helps(d);
1143 print_filter_helps(d);
1144 print_writer_helps(d);
1145 exit(0);
1146 }
1147
1148 static void init_colors_or_die(void)
1149 {
1150 int ret, i;
1151
1152 if (!want_colors())
1153 return;
1154 daemon_set_default_log_colors();
1155 daemon_set_flag(DF_COLOR_LOG);
1156 for (i = 0; i < conf.log_color_given; i++) {
1157 ret = daemon_set_log_color(conf.log_color_arg[i]);
1158 if (ret < 0)
1159 exit(EXIT_FAILURE);
1160 }
1161 }
1162
1163 /**
1164 * the main function of para_audiod
1165 *
1166 * \param argc usual argument count
1167 * \param argv usual argument vector
1168 *
1169 * \return EXIT_SUCCESS or EXIT_FAILURE
1170 *
1171 * \sa para_audiod(1)
1172 * */
1173 int main(int argc, char *argv[])
1174 {
1175 int ret, i;
1176 static struct sched s;
1177 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1178 struct audiod_cmdline_parser_params params = {
1179 .override = 0,
1180 .initialize = 1,
1181 .check_required = 0,
1182 .check_ambiguity = 0,
1183 .print_errors = 1
1184 };
1185
1186 valid_fd_012();
1187 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1188 exit(EXIT_FAILURE);
1189 HANDLE_VERSION_FLAG("audiod", conf);
1190 /* init receivers/filters/writers early to make help work */
1191 recv_init();
1192 filter_init();
1193 writer_init();
1194 if (conf.help_given || conf.detailed_help_given)
1195 print_help_and_die();
1196 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1197 parse_config_or_die();
1198 init_colors_or_die();
1199 daemon_set_flag(DF_LOG_TIME);
1200 daemon_set_flag(DF_LOG_HOSTNAME);
1201 daemon_set_flag(DF_LOG_LL);
1202 if (conf.logfile_given) {
1203 daemon_set_logfile(conf.logfile_arg);
1204 daemon_open_log_or_die();
1205 }
1206 ret = parse_stream_args();
1207 if (ret < 0) {
1208 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1209 exit(EXIT_FAILURE);
1210 }
1211 log_welcome("para_audiod");
1212 server_uptime(UPTIME_SET);
1213 set_initial_status();
1214 FOR_EACH_SLOT(i)
1215 clear_slot(i);
1216 init_grabbing();
1217 setup_signal_handling();
1218 signal_setup_default(sig_task);
1219
1220 init_status_task(stat_task);
1221 init_command_task(cmd_task);
1222
1223 if (conf.daemon_given)
1224 daemonize();
1225
1226 register_task(&sig_task->task);
1227 register_task(&cmd_task->task);
1228 register_task(&stat_task->task);
1229 s.default_timeout.tv_sec = 0;
1230 s.default_timeout.tv_usec = 99 * 1000;
1231 ret = schedule(&s);
1232
1233 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1234 return EXIT_FAILURE;
1235 }