Major audio format handler cleanups.
[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
12 #include "para.h"
13 #include "error.h"
14 #include "audiod.cmdline.h"
15 #include "list.h"
16 #include "sched.h"
17 #include "ggo.h"
18 #include "recv.h"
19 #include "filter.h"
20 #include "grab_client.cmdline.h"
21 #include "grab_client.h"
22 #include "client.cmdline.h"
23 #include "client.h"
24 #include "audiod.h"
25 #include "net.h"
26 #include "daemon.h"
27 #include "string.h"
28 #include "fd.h"
29 #include "write.h"
30 #include "write_common.h"
31 #include "signal.h"
32
33 /** define the array of error lists needed by para_audiod */
34 INIT_AUDIOD_ERRLISTS;
35 /** define the array containing all supported audio formats */
36 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
37
38 /** Defines how audiod handles one supported audio format. */
39 struct audio_format_info {
40 /** pointer to the receiver for this audio format */
41 struct receiver *receiver;
42 /** the receiver configuration */
43 void *receiver_conf;
44 /** the number of filters that should be activated for this audio format */
45 unsigned int num_filters;
46 /** Array of filter numbers to be activated. */
47 unsigned *filter_nums;
48 /** Pointer to the array of filter configurations. */
49 void **filter_conf;
50 /** the number of filters that should be activated for this audio format */
51 unsigned int num_writers;
52 /** Array of writer numbers to be activated. */
53 int *writer_nums;
54 /** pointer to the array of writer configurations */
55 void **writer_conf;
56 /** do not start receiver/filters/writer before this time */
57 struct timeval restart_barrier;
58 };
59
60 /**
61 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
62 * be associated with a receiver/filter/writer triple. This array holds all
63 * information on the status of these slots.
64 *
65 * \sa struct slot_info
66 * */
67 struct slot_info slot[MAX_STREAM_SLOTS];
68
69 /** The vss status flags audiod is interested in. */
70 enum vss_status_flags {
71 /** Whether the 'N' flag is set. */
72 VSS_STATUS_FLAG_NEXT = 1,
73 /** The 'P' flag is set. */
74 VSS_STATUS_FLAG_PLAYING = 2,
75 };
76
77 /**
78 * The task for obtaining para_server's status (para_client stat).
79 *
80 * \sa struct task, struct sched.
81 */
82 struct status_task {
83 /** The associated task structure of audiod. */
84 struct task task;
85 /** Client data associated with the stat task. */
86 struct client_task *ct;
87 /** Do not restart client command until this time. */
88 struct timeval restart_barrier;
89 /** Last time we received status data from para_server. */
90 struct timeval last_status_read;
91 /** The offset value announced by para_server. */
92 int offset_seconds;
93 /** The length of the current audio file as announced by para_server. */
94 int length_seconds;
95 /** The start of the current stream from the view of para_server. */
96 struct timeval server_stream_start;
97 /** The average time deviation between para_server and para_audiod. */
98 struct timeval sa_time_diff;
99 /** Whether client time is ahead of server time. */
100 int sa_time_diff_sign;
101 /** The 'P' and the 'N' flags as announced by para_server. */
102 enum vss_status_flags vss_status;
103 /** Number of times the clock difference is to be checked. */
104 unsigned clock_diff_count;
105 /** When to start the next check for clock difference. */
106 struct timeval clock_diff_barrier;
107 /** Number of the audio format as announced by para_server. */
108 int current_audio_format_num;
109 };
110
111 /** The array of status items sent by para_server. */
112 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
113
114 /**
115 * the current mode of operation of which can be changed by the on/off/cycle
116 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
117 */
118 int audiod_status = AUDIOD_ON;
119
120 /**
121 * the gengetopt args_info struct that holds information on all command line
122 * arguments
123 */
124 struct audiod_args_info conf;
125
126 static char *socket_name;
127 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
128
129 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
130
131 static struct status_task status_task_struct;
132
133 /**
134 * the task that calls the status command of para_server
135 *
136 * \sa struct status_task
137 */
138 static struct status_task *stat_task = &status_task_struct;
139 static struct timeval initial_delay_barrier;
140
141 /**
142 * the task for handling audiod commands
143 *
144 * \sa struct task, struct sched
145 */
146 struct command_task {
147 /** the local listening socket */
148 int fd;
149 /** the associated task structure */
150 struct task task;
151 };
152
153 /** iterate over all supported audio formats */
154 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
155
156 /**
157 * get the audio format number
158 * \param name the name of the audio format
159 *
160 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
161 * \a name is not a supported audio format.
162 */
163 int get_audio_format_num(char *name)
164 {
165 int i;
166
167 while (para_isspace(*name))
168 name++;
169 FOR_EACH_AUDIO_FORMAT(i)
170 if (!strcmp(name, audio_formats[i]))
171 return i;
172 return -E_UNSUPPORTED_AUDIO_FORMAT;
173 }
174
175 char *get_time_string(int slot_num)
176 {
177 int ret, seconds = 0, length;
178 struct timeval *tmp, sum, sss, /* server stream start */
179 wtime, /* now - writer start */
180 rskip; /* receiver start - sss */
181 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
182
183 if (audiod_status == AUDIOD_OFF)
184 goto empty;
185 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
186 if (stat_task->length_seconds) /* paused */
187 return NULL;
188 goto empty; /* stopped */
189 }
190 if (audiod_status == AUDIOD_ON && !s)
191 goto empty;
192 /* valid status items and playing */
193 if (s) { /* writer active in this slot */
194 length = s->seconds_total;
195 tmp = &s->server_stream_start;
196 } else { /* standby mode, rely on status items */
197 length = stat_task->length_seconds;
198 tmp = &stat_task->server_stream_start;
199 }
200 if (stat_task->sa_time_diff_sign > 0)
201 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
202 else
203 tv_add(tmp, &stat_task->sa_time_diff, &sss);
204 if (!s) {
205 struct timeval diff;
206 tv_diff(now, &sss, &diff);
207 seconds = diff.tv_sec + stat_task->offset_seconds;
208 goto out;
209 }
210 tv_diff(now, &s->wstime, &wtime);
211 seconds = s->offset_seconds;
212 ret = tv_diff(&s->rstime, &sss, &rskip);
213 if (ret > 0) { /* audiod was started in the middle of the stream */
214 tv_add(&wtime, &rskip, &sum);
215 seconds += sum.tv_sec;
216 } else
217 seconds += wtime.tv_sec;
218 out:
219 seconds = PARA_MIN(seconds, length);
220 seconds = PARA_MAX(seconds, 0);
221 return make_message(
222 "%s: %s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
223 status_item_list[SI_PLAY_TIME],
224 s? "" : "~",
225 seconds / 60,
226 seconds % 60,
227 (length - seconds) / 60,
228 (length - seconds) % 60,
229 length? (seconds * 100 + length / 2) / length : 0,
230 length / 60,
231 length % 60
232 );
233 empty:
234 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
235 }
236
237 static int want_colors(void)
238 {
239 if (conf.color_arg == color_arg_no)
240 return 0;
241 if (conf.color_arg == color_arg_yes)
242 return 1;
243 if (conf.logfile_given)
244 return 0;
245 return isatty(STDERR_FILENO);
246 }
247
248 static void parse_config_or_die(void)
249 {
250 int ret;
251 char *config_file;
252 struct audiod_cmdline_parser_params params = {
253 .override = 0,
254 .initialize = 0,
255 .check_required = 1,
256 .check_ambiguity = 0,
257 .print_errors = 1
258 };
259
260 if (conf.config_file_given)
261 config_file = para_strdup(conf.config_file_arg);
262 else {
263 char *home = para_homedir();
264 config_file = make_message("%s/.paraslash/audiod.conf", home);
265 free(home);
266 }
267 ret = file_exists(config_file);
268 if (conf.config_file_given && !ret) {
269 PARA_EMERG_LOG("can not read config file %s\n", config_file);
270 goto err;
271 }
272 if (ret)
273 audiod_cmdline_parser_config_file(config_file, &conf, &params);
274 free(config_file);
275 daemon_set_loglevel(conf.loglevel_arg);
276 return;
277 err:
278 free(config_file);
279 exit(EXIT_FAILURE);
280 }
281
282 static void setup_signal_handling(void)
283 {
284 sig_task->fd = para_signal_init();
285 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
286 para_install_sighandler(SIGINT);
287 para_install_sighandler(SIGTERM);
288 para_install_sighandler(SIGHUP);
289 para_sigaction(SIGPIPE, SIG_IGN);
290 }
291
292 static void clear_slot(int slot_num)
293 {
294 struct slot_info *s = &slot[slot_num];
295
296 PARA_INFO_LOG("clearing slot %d\n", slot_num);
297 memset(s, 0, sizeof(struct slot_info));
298 s->format = -1;
299 }
300
301 static void close_receiver(int slot_num)
302 {
303 struct slot_info *s = &slot[slot_num];
304 struct audio_format_info *a;
305
306 if (s->format < 0 || !s->receiver_node)
307 return;
308 a = &afi[s->format];
309 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
310 audio_formats[s->format], slot_num);
311 a->receiver->close(s->receiver_node);
312 free(s->receiver_node);
313 s->receiver_node = NULL;
314 }
315
316 static void kill_all_decoders(int error)
317 {
318 int i;
319
320 FOR_EACH_SLOT(i) {
321 struct slot_info *s = &slot[i];
322 if (s->wng && s->wng->task.error >= 0) {
323 PARA_INFO_LOG("deactivating wng in slot %d\n",
324 i);
325 s->wng->task.error = error;
326 }
327 if (s->fc && s->fc->task.error >= 0) {
328 PARA_INFO_LOG("deactivatimg filter chain in slot %d\n", i);
329 s->fc->task.error = error;
330 }
331 if (s->receiver_node && s->receiver_node->task.error >= 0) {
332 PARA_INFO_LOG("deactivating receiver_node in slot %d\n", i);
333 s->receiver_node->task.error = error;
334 }
335 }
336 }
337
338 static int get_empty_slot(void)
339 {
340 int i;
341 struct slot_info *s;
342
343 FOR_EACH_SLOT(i) {
344 s = &slot[i];
345 if (s->format < 0) {
346 clear_slot(i);
347 return i;
348 }
349 if (s->wng || s->receiver_node || s->fc)
350 continue;
351 clear_slot(i);
352 return i;
353 }
354 return -E_NO_MORE_SLOTS;
355 }
356
357 /**
358 * get the number of filters
359 *
360 * \param audio_format_num the number identifying the audio format
361 *
362 * \return the number of filters for the given audio format
363 *
364 * \sa struct filter;
365 */
366 int num_filters(int audio_format_num)
367 {
368 return afi[audio_format_num].num_filters;
369 }
370
371 static void open_filters(int slot_num)
372 {
373 struct slot_info *s = &slot[slot_num];
374 struct audio_format_info *a = &afi[s->format];
375 struct filter_node *fn;
376 int nf = a->num_filters;
377 int i;
378
379 s->fc = NULL;
380 if (!nf)
381 return;
382 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
383 s->fc = para_calloc(sizeof(struct filter_chain));
384 s->fc->filter_nodes = para_malloc(nf * sizeof(struct filter_node));
385 s->fc->inbufp = &s->receiver_node->buf;
386 s->fc->in_loaded = &s->receiver_node->loaded;
387 s->fc->input_error = &s->receiver_node->task.error;
388 s->fc->task.pre_select = filter_pre_select;
389 s->fc->task.post_select = NULL;
390 s->fc->task.error = 0;
391 s->fc->num_filters = nf;
392
393 s->receiver_node->output_error = &s->fc->task.error;
394 sprintf(s->fc->task.status, "filter chain");
395 FOR_EACH_FILTER_NODE(fn, s->fc, i) {
396 struct filter *f = filters + a->filter_nums[i];
397 fn->filter_num = a->filter_nums[i];
398 fn->conf = a->filter_conf[i];
399 fn->fc = s->fc;
400 fn->loaded = 0;
401 INIT_LIST_HEAD(&fn->callbacks);
402 f->open(fn);
403 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
404 audio_formats[s->format], i, nf, f->name, slot_num);
405 s->fc->outbufp = &fn->buf;
406 s->fc->out_loaded = &fn->loaded;
407 }
408 register_task(&s->fc->task);
409 }
410
411 static void open_writers(int slot_num)
412 {
413 int ret, i;
414 struct slot_info *s = &slot[slot_num];
415 struct audio_format_info *a = &afi[s->format];
416
417 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
418 if (!a->num_writers)
419 s->wng = setup_default_wng();
420 else
421 s->wng = wng_new(a->num_writers);
422 if (s->fc) {
423 s->wng->bufp = s->fc->outbufp;
424 s->wng->loaded = s->fc->out_loaded;
425 s->wng->input_error = &s->fc->task.error;
426 s->wng->channels = &s->fc->channels;
427 s->wng->samplerate = &s->fc->samplerate;
428 s->fc->output_error = &s->wng->task.error;
429 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
430 } else {
431 s->wng->bufp = &s->receiver_node->buf;
432 s->wng->loaded = &s->receiver_node->loaded;
433 s->wng->input_error = &s->receiver_node->task.error;
434 }
435 for (i = 0; i < a->num_writers; i++) {
436 s->wng->writer_nodes[i].conf = a->writer_conf[i];
437 s->wng->writer_nodes[i].writer_num = a->writer_nums[i];
438 }
439 ret = wng_open(s->wng);
440 if (ret < 0)
441 return;
442 s->wstime = *now;
443 s->server_stream_start = stat_task->server_stream_start.tv_sec?
444 stat_task->server_stream_start : *now;
445 s->offset_seconds = stat_task->offset_seconds;
446 s->seconds_total = stat_task->length_seconds;
447 activate_inactive_grab_clients(slot_num, s->format, s->fc);
448 }
449
450 static int open_receiver(int format)
451 {
452 struct audio_format_info *a = &afi[format];
453 struct slot_info *s;
454 int ret, slot_num;
455 struct receiver_node *rn;
456 const struct timeval restart_delay = {2, 0};
457
458 ret = get_empty_slot();
459 if (ret < 0)
460 goto err;
461 slot_num = ret;
462 s = &slot[slot_num];
463 s->format = format;
464 s->receiver_node = para_calloc(sizeof(struct receiver_node));
465 rn = s->receiver_node;
466 rn->receiver = a->receiver;
467 rn->conf = a->receiver_conf;
468 ret = a->receiver->open(s->receiver_node);
469 if (ret < 0) {
470 free(s->receiver_node);
471 s->receiver_node = NULL;
472 goto err;
473 }
474 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
475 audio_formats[s->format], a->receiver->name, slot_num);
476 rn->task.pre_select = a->receiver->pre_select;
477 rn->task.post_select = a->receiver->post_select;
478 s->rstime = *now;
479 sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
480 register_task(&rn->task);
481 ret = 1;
482 err:
483 if (ret < 0)
484 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
485 tv_add(now, &restart_delay, &afi[format].restart_barrier);
486 return ret;
487 }
488
489 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
490 static int receiver_running(int format)
491 {
492 int i, ret = 0;
493
494 FOR_EACH_SLOT(i) {
495 struct slot_info *s = &slot[i];
496 if (s->format != format)
497 continue;
498 if (!s->receiver_node)
499 continue;
500 if (s->receiver_node->task.error >= 0)
501 return 1;
502 ret = -1;
503 }
504 return ret;
505 }
506
507 static void open_current_receiver(struct sched *s)
508 {
509 struct timeval diff;
510 int ret, cafn = stat_task->current_audio_format_num;
511
512 if (cafn < 0 || !stat_task->ct)
513 return;
514 /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
515 if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
516 return;
517 ret = receiver_running(cafn);
518 if (ret > 0) /* already running and not eof */
519 return;
520 if (ret < 0) { /* eof */
521 /*
522 * para_server uses a zero start time during the announcement
523 * period, i.e. before it sends the first chunk. Wait until
524 * this period begins to avoid restarting the receiver that
525 * belongs to the file just completed.
526 */
527 if (stat_task->server_stream_start.tv_sec)
528 return;
529 }
530 if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
531 /* avoid busy loop */
532 s->timeout = diff;
533 return;
534 }
535 /* start a new receiver */
536 open_receiver(cafn);
537 }
538
539 static unsigned compute_time_diff(const struct timeval *status_time)
540 {
541 struct timeval tmp, diff;
542 static unsigned count;
543 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
544 const struct timeval max_deviation = {0, 500 * 1000};
545 const int time_smooth = 5;
546
547 if (!status_time)
548 return count;
549 sign = tv_diff(status_time, now, &diff);
550 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
551 // sign, sa_time_diff_sign);
552 if (!count) {
553 sa_time_diff_sign = sign;
554 stat_task->sa_time_diff = diff;
555 count++;
556 goto out;
557 }
558 if (count > 5) {
559 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
560 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
561 PARA_WARNING_LOG("time diff jump: %lims\n",
562 s * tv2ms(&tmp));
563 }
564 count++;
565 sa_time_diff_sign = tv_convex_combination(
566 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
567 count > 10? sign : sign * time_smooth, &diff,
568 &tmp);
569 stat_task->sa_time_diff = tmp;
570 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
571 sign > 0? "+" : "-",
572 tv2ms(&diff),
573 sa_time_diff_sign ? "+" : "-",
574 tv2ms(&stat_task->sa_time_diff)
575 );
576 out:
577 stat_task->sa_time_diff_sign = sa_time_diff_sign;
578 return count;
579 }
580
581 static int check_stat_line(char *line, __a_unused void *data)
582 {
583 int itemnum;
584 size_t ilen = 0;
585 long unsigned sec, usec;
586 char *tmp;
587
588 //PARA_INFO_LOG("line: %s\n", line);
589 if (!line)
590 return 1;
591 itemnum = stat_line_valid(line);
592 if (itemnum < 0) {
593 PARA_WARNING_LOG("invalid status line: %s\n", line);
594 return 1;
595 }
596 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
597 return 1;
598 tmp = make_message("%s\n", line);
599 stat_client_write(tmp, itemnum);
600 free(tmp);
601 free(stat_item_values[itemnum]);
602 stat_item_values[itemnum] = para_strdup(line);
603 ilen = strlen(status_item_list[itemnum]);
604 switch (itemnum) {
605 case SI_STATUS_FLAGS:
606 stat_task->vss_status = 0;
607 if (strchr(line, 'N'))
608 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
609 if (strchr(line, 'P'))
610 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
611 break;
612 case SI_OFFSET:
613 stat_task->offset_seconds = atoi(line + ilen + 1);
614 break;
615 case SI_SECONDS_TOTAL:
616 stat_task->length_seconds = atoi(line + ilen + 1);
617 break;
618 case SI_STREAM_START:
619 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
620 struct timeval a_start, delay;
621 delay.tv_sec = conf.stream_delay_arg / 1000;
622 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
623 stat_task->server_stream_start.tv_sec = sec;
624 stat_task->server_stream_start.tv_usec = usec;
625 if (compute_time_diff(NULL) > 2) {
626 if (stat_task->sa_time_diff_sign < 0)
627 tv_add(&stat_task->server_stream_start,
628 &stat_task->sa_time_diff, &a_start);
629 else
630 tv_diff(&stat_task->server_stream_start,
631 &stat_task->sa_time_diff, &a_start);
632 tv_add(&a_start, &delay, &initial_delay_barrier);
633 }
634 }
635 break;
636 case SI_CURRENT_TIME:
637 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
638 struct timeval tv = {sec, usec};
639 compute_time_diff(&tv);
640 }
641 break;
642 case SI_FORMAT:
643 stat_task->current_audio_format_num = get_audio_format_num(
644 line + ilen + 1);
645 }
646 return 1;
647 }
648
649 static int parse_stream_command(const char *txt, char **cmd)
650 {
651 char *p = strchr(txt, ':');
652 int i;
653
654 if (!p)
655 return -E_MISSING_COLON;
656 p++;
657 FOR_EACH_AUDIO_FORMAT(i) {
658 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
659 continue;
660 *cmd = p;
661 return i;
662 }
663 return -E_UNSUPPORTED_AUDIO_FORMAT;
664 }
665
666 static int add_filter(int format, char *cmdline)
667 {
668 struct audio_format_info *a = &afi[format];
669 int filter_num, nf = a->num_filters;
670
671 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
672 if (filter_num < 0)
673 return filter_num;
674 a->filter_nums[nf] = filter_num;
675 a->num_filters++;
676 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
677 filters[filter_num].name);
678 return filter_num;
679 }
680
681 static int parse_writer_args(void)
682 {
683 int i, ret, nw;
684 char *cmd;
685 struct audio_format_info *a;
686
687 nw = PARA_MAX(1U, conf.writer_given);
688 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
689 FOR_EACH_AUDIO_FORMAT(i) {
690 a = &afi[i];
691 a->writer_conf = para_malloc(nw * sizeof(void *));
692 a->writer_nums = para_malloc(nw * sizeof(int));
693 a->num_writers = 0;
694 }
695 for (i = 0; i < conf.writer_given; i++) {
696 void *wconf;
697 int writer_num;
698 ret = parse_stream_command(conf.writer_arg[i], &cmd);
699 if (ret < 0)
700 goto out;
701 a = &afi[ret];
702 nw = a->num_writers;
703 wconf = check_writer_arg(cmd, &writer_num);
704 if (!wconf) {
705 ret = writer_num;
706 goto out;
707 }
708 a->writer_nums[nw] = writer_num;
709 a->writer_conf[nw] = wconf;
710 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
711 nw, writer_names[writer_num]);
712 a->num_writers++;
713 }
714 ret = 1;
715 out:
716 return ret;
717 }
718
719 static int parse_receiver_args(void)
720 {
721 int i, ret, receiver_num;
722 char *cmd = NULL;
723 struct audio_format_info *a;
724
725 for (i = conf.receiver_given - 1; i >= 0; i--) {
726 char *arg = conf.receiver_arg[i];
727 char *recv_arg = strchr(arg, ':');
728 ret = -E_MISSING_COLON;
729 if (!recv_arg)
730 goto out;
731 *recv_arg = '\0';
732 recv_arg++;
733 ret = get_audio_format_num(arg);
734 if (ret < 0)
735 goto out;
736 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
737 if (!afi[ret].receiver_conf) {
738 ret = -E_RECV_SYNTAX;
739 goto out;
740 }
741 afi[ret].receiver = &receivers[receiver_num];
742 }
743 /* use the first available receiver with no arguments
744 * for those audio formats for which no receiver
745 * was specified
746 */
747 cmd = para_strdup(receivers[0].name);
748 FOR_EACH_AUDIO_FORMAT(i) {
749 a = &afi[i];
750 if (a->receiver_conf)
751 continue;
752 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
753 if (!a->receiver_conf)
754 return -E_RECV_SYNTAX;
755 a->receiver = &receivers[receiver_num];
756 }
757 ret = 1;
758 out:
759 free(cmd);
760 return ret;
761 }
762
763 static int init_default_filters(void)
764 {
765 int i, ret = 1;
766
767 FOR_EACH_AUDIO_FORMAT(i) {
768 struct audio_format_info *a = &afi[i];
769 char *tmp;
770 int j;
771
772 if (a->num_filters)
773 continue; /* no default -- nothing to to */
774 /* add "dec" to audio format name */
775 tmp = make_message("%sdec", audio_formats[i]);
776 for (j = 0; filters[j].name; j++)
777 if (!strcmp(tmp, filters[j].name))
778 break;
779 free(tmp);
780 ret = -E_UNSUPPORTED_FILTER;
781 if (!filters[j].name)
782 goto out;
783 tmp = para_strdup(filters[j].name);
784 ret = add_filter(i, tmp);
785 free(tmp);
786 if (ret < 0)
787 goto out;
788 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
789 filters[j].name);
790 }
791 out:
792 return ret;
793 }
794
795 static int parse_filter_args(void)
796 {
797 int i, ret, nf;
798
799 nf = PARA_MAX(1U, conf.filter_given);
800 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
801 FOR_EACH_AUDIO_FORMAT(i) {
802 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
803 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
804 }
805 if (!conf.no_default_filters_given)
806 return init_default_filters();
807 for (i = 0; i < conf.filter_given; i++) {
808 char *arg = conf.filter_arg[i];
809 char *filter_name = strchr(arg, ':');
810 ret = -E_MISSING_COLON;
811 if (!filter_name)
812 goto out;
813 *filter_name = '\0';
814 filter_name++;
815 ret = get_audio_format_num(arg);
816 if (ret < 0)
817 goto out;
818 ret = add_filter(ret, filter_name);
819 if (ret < 0)
820 goto out;
821 }
822 ret = init_default_filters(); /* use default values for the rest */
823 out:
824 return ret;
825 }
826
827 static int parse_stream_args(void)
828 {
829 int ret;
830
831 ret = parse_receiver_args();
832 if (ret < 0)
833 return ret;
834 ret = parse_filter_args();
835 if (ret < 0)
836 return ret;
837 ret = parse_writer_args();
838 if (ret < 0)
839 return ret;
840 return 1;
841 }
842
843 /* does not unlink socket on errors */
844 static int audiod_get_socket(void)
845 {
846 struct sockaddr_un unix_addr;
847 int ret, fd;
848
849 if (conf.socket_given)
850 socket_name = para_strdup(conf.socket_arg);
851 else {
852 char *hn = para_hostname();
853 socket_name = make_message("/var/paraslash/audiod_socket.%s",
854 hn);
855 free(hn);
856 }
857 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
858 if (conf.force_given)
859 unlink(socket_name);
860 ret = create_local_socket(socket_name, &unix_addr,
861 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
862 if (ret < 0)
863 goto err;
864 fd = ret;
865 if (listen(fd , 5) < 0) {
866 ret = -ERRNO_TO_PARA_ERROR(errno);
867 goto err;
868 }
869 ret = mark_fd_nonblocking(fd);
870 if (ret < 0)
871 goto err;
872 return fd;
873 err:
874 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
875 exit(EXIT_FAILURE);
876 }
877
878 static void signal_pre_select(struct sched *s, struct task *t)
879 {
880 struct signal_task *st = container_of(t, struct signal_task, task);
881 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
882 }
883
884 static void signal_post_select(struct sched *s, struct task *t)
885 {
886 struct signal_task *st = container_of(t, struct signal_task, task);
887
888 if (!FD_ISSET(st->fd, &s->rfds))
889 return;
890
891 st->signum = para_next_signal();
892 switch (st->signum) {
893 case SIGINT:
894 case SIGTERM:
895 case SIGHUP:
896 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
897 clean_exit(EXIT_FAILURE, "caught deadly signal");
898 }
899 }
900
901 static void signal_setup_default(struct signal_task *st)
902 {
903 st->task.pre_select = signal_pre_select;
904 st->task.post_select = signal_post_select;
905 sprintf(st->task.status, "signal task");
906 }
907
908 static void command_pre_select(struct sched *s, struct task *t)
909 {
910 struct command_task *ct = container_of(t, struct command_task, task);
911 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
912 }
913
914 static void command_post_select(struct sched *s, struct task *t)
915 {
916 int ret;
917 struct command_task *ct = container_of(t, struct command_task, task);
918
919 audiod_status_dump();
920 if (!FD_ISSET(ct->fd, &s->rfds))
921 return;
922 ret = handle_connect(ct->fd);
923 if (ret < 0)
924 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
925 }
926
927 static void init_command_task(struct command_task *ct)
928 {
929 ct->task.pre_select = command_pre_select;
930 ct->task.post_select = command_post_select;
931 ct->task.error = 0;
932 ct->fd = audiod_get_socket(); /* doesn't return on errors */
933 sprintf(ct->task.status, "command task");
934 }
935
936 static void close_stat_pipe(void)
937 {
938 int i;
939
940 if (!stat_task->ct)
941 return;
942 client_close(stat_task->ct);
943 stat_task->ct = NULL;
944 FOR_EACH_STATUS_ITEM(i) {
945 free(stat_item_values[i]);
946 stat_item_values[i] = NULL;
947 }
948 dump_empty_status();
949 stat_task->length_seconds = 0;
950 stat_task->offset_seconds = 0;
951 stat_task->vss_status = 0;
952 audiod_status_dump();
953 }
954
955 /**
956 * close the connection to para_server and exit
957 *
958 * \param status the exit status which is passed to exit(3)
959 * \param msg the log message
960 *
961 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
962 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
963 * EXIT_FAILURE.
964 *
965 * \sa exit(3)
966 */
967 void __noreturn clean_exit(int status, const char *msg)
968 {
969 PARA_EMERG_LOG("%s\n", msg);
970 if (socket_name)
971 unlink(socket_name);
972 close_stat_pipe();
973 exit(status);
974 }
975
976 /* avoid busy loop if server is down */
977 static void set_stat_task_restart_barrier(unsigned seconds)
978 {
979 struct timeval delay = {seconds, 0};
980 tv_add(now, &delay, &stat_task->restart_barrier);
981 }
982
983 static void try_to_close_slot(int slot_num)
984 {
985 struct slot_info *s = &slot[slot_num];
986
987 if (s->format < 0)
988 return;
989 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
990 return;
991 if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
992 return;
993 if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
994 return;
995 PARA_INFO_LOG("closing slot %d\n", slot_num);
996 wng_close(s->wng);
997 close_filters(s->fc);
998 free(s->fc);
999 close_receiver(slot_num);
1000 clear_slot(slot_num);
1001 }
1002
1003 /*
1004 * Check if any receivers/filters/writers need to be started and do so if
1005 * necessary.
1006 */
1007 static void start_stop_decoders(struct sched *s)
1008 {
1009 int i;
1010
1011 FOR_EACH_SLOT(i)
1012 try_to_close_slot(i);
1013 if (audiod_status != AUDIOD_ON ||
1014 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1015 return kill_all_decoders(-E_NOT_PLAYING);
1016 open_current_receiver(s);
1017 FOR_EACH_SLOT(i) {
1018 struct slot_info *sl = &slot[i];
1019 struct audio_format_info *a;
1020 struct timeval diff;
1021
1022 if (sl->format < 0)
1023 continue;
1024 a = &afi[sl->format];
1025 if (!sl->receiver_node)
1026 continue;
1027 if ((!a->num_filters || sl->fc) && sl->wng)
1028 continue; /* everything already started */
1029 if (!a->num_filters) {
1030 if (sl->receiver_node->loaded && !sl->wng) {
1031 open_writers(i);
1032 }
1033 continue;
1034 }
1035 if (sl->receiver_node->loaded && !sl->fc) {
1036 open_filters(i);
1037 continue;
1038 }
1039 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
1040 continue;
1041 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
1042 open_writers(i);
1043 continue;
1044 }
1045 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
1046 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
1047 s->timeout = diff;
1048 }
1049 }
1050 }
1051
1052
1053 /* restart the client task if necessary */
1054 static void status_pre_select(struct sched *s, struct task *t)
1055 {
1056 struct status_task *st = container_of(t, struct status_task, task);
1057
1058 if (audiod_status == AUDIOD_OFF) {
1059 if (!st->ct)
1060 goto out;
1061 if (st->ct->task.error >= 0) {
1062 st->ct->task.error = -E_AUDIOD_OFF;
1063 goto out;
1064 }
1065 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1066 goto out;
1067 close_stat_pipe();
1068 st->clock_diff_count = conf.clock_diff_count_arg;
1069 goto out;
1070 }
1071 if (st->ct) {
1072 unsigned bytes_left;
1073 if (st->ct->task.error < 0) {
1074 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1075 goto out;
1076 close_stat_pipe();
1077 goto out;
1078 }
1079 if (st->ct->status != CL_RECEIVING)
1080 goto out;
1081 bytes_left = for_each_line(st->ct->buf, st->ct->loaded,
1082 &check_stat_line, NULL);
1083 if (st->ct->loaded != bytes_left) {
1084 st->last_status_read = *now;
1085 st->ct->loaded = bytes_left;
1086 } else {
1087 struct timeval diff;
1088 tv_diff(now, &st->last_status_read, &diff);
1089 if (diff.tv_sec > 61)
1090 st->ct->task.error = -E_STATUS_TIMEOUT;
1091 }
1092 goto out;
1093 }
1094 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1095 goto out;
1096 if (st->clock_diff_count) { /* get status only one time */
1097 char *argv[] = {"audiod", "stat", "1", NULL};
1098 int argc = 3;
1099 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1100 st->clock_diff_count--;
1101 client_open(argc, argv, &st->ct, NULL);
1102 set_stat_task_restart_barrier(2);
1103
1104 } else {
1105 char *argv[] = {"audiod", "stat", NULL};
1106 int argc = 2;
1107 client_open(argc, argv, &st->ct, NULL);
1108 set_stat_task_restart_barrier(5);
1109 }
1110 free(stat_item_values[SI_BASENAME]);
1111 stat_item_values[SI_BASENAME] = make_message(
1112 "%s: no connection to para_server\n",
1113 status_item_list[SI_BASENAME]);
1114 stat_client_write(stat_item_values[SI_BASENAME],
1115 SI_BASENAME);
1116 st->last_status_read = *now;
1117 out:
1118 start_stop_decoders(s);
1119 }
1120
1121 static void init_status_task(struct status_task *st)
1122 {
1123 memset(st, 0, sizeof(struct status_task));
1124 st->task.pre_select = status_pre_select;
1125 st->sa_time_diff_sign = 1;
1126 st->clock_diff_count = conf.clock_diff_count_arg;
1127 st->current_audio_format_num = -1;
1128 sprintf(st->task.status, "status task");
1129 }
1130
1131 static void set_initial_status(void)
1132 {
1133 audiod_status = AUDIOD_ON;
1134 if (!conf.mode_given)
1135 return;
1136 if (!strcmp(conf.mode_arg, "sb")) {
1137 audiod_status = AUDIOD_STANDBY;
1138 return;
1139 }
1140 if (!strcmp(conf.mode_arg, "off")) {
1141 audiod_status = AUDIOD_OFF;
1142 return;
1143 }
1144 if (strcmp(conf.mode_arg, "on"))
1145 PARA_WARNING_LOG("invalid mode\n");
1146 }
1147
1148 __noreturn static void print_help_and_die(void)
1149 {
1150 int d = conf.detailed_help_given;
1151 const char **p = d? audiod_args_info_detailed_help
1152 : audiod_args_info_help;
1153
1154 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1155 AUDIOD_CMDLINE_PARSER_VERSION);
1156 printf_or_die("%s\n\n", audiod_args_info_usage);
1157 for (; *p; p++)
1158 printf_or_die("%s\n", *p);
1159 print_receiver_helps(d);
1160 print_filter_helps(d);
1161 print_writer_helps(d);
1162 exit(0);
1163 }
1164
1165 static void init_colors_or_die(void)
1166 {
1167 int ret, i;
1168
1169 if (!want_colors())
1170 return;
1171 daemon_set_default_log_colors();
1172 daemon_set_flag(DF_COLOR_LOG);
1173 for (i = 0; i < conf.log_color_given; i++) {
1174 ret = daemon_set_log_color(conf.log_color_arg[i]);
1175 if (ret < 0)
1176 exit(EXIT_FAILURE);
1177 }
1178 }
1179
1180 /**
1181 * the main function of para_audiod
1182 *
1183 * \param argc usual argument count
1184 * \param argv usual argument vector
1185 *
1186 * \return EXIT_SUCCESS or EXIT_FAILURE
1187 *
1188 * \sa para_audiod(1)
1189 * */
1190 int main(int argc, char *argv[])
1191 {
1192 int ret, i;
1193 static struct sched s;
1194 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1195 struct audiod_cmdline_parser_params params = {
1196 .override = 0,
1197 .initialize = 1,
1198 .check_required = 0,
1199 .check_ambiguity = 0,
1200 .print_errors = 1
1201 };
1202
1203 valid_fd_012();
1204 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1205 exit(EXIT_FAILURE);
1206 HANDLE_VERSION_FLAG("audiod", conf);
1207 /* init receivers/filters/writers early to make help work */
1208 recv_init();
1209 filter_init();
1210 writer_init();
1211 if (conf.help_given || conf.detailed_help_given)
1212 print_help_and_die();
1213 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1214 parse_config_or_die();
1215 init_colors_or_die();
1216 daemon_set_flag(DF_LOG_TIME);
1217 daemon_set_flag(DF_LOG_HOSTNAME);
1218 daemon_set_flag(DF_LOG_LL);
1219 if (conf.logfile_given) {
1220 daemon_set_logfile(conf.logfile_arg);
1221 daemon_open_log_or_die();
1222 }
1223 ret = parse_stream_args();
1224 if (ret < 0) {
1225 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1226 exit(EXIT_FAILURE);
1227 }
1228 log_welcome("para_audiod");
1229 server_uptime(UPTIME_SET);
1230 set_initial_status();
1231 FOR_EACH_SLOT(i)
1232 clear_slot(i);
1233 init_grabbing();
1234 setup_signal_handling();
1235 signal_setup_default(sig_task);
1236
1237 init_status_task(stat_task);
1238 init_command_task(cmd_task);
1239
1240 if (conf.daemon_given)
1241 daemonize();
1242
1243 register_task(&sig_task->task);
1244 register_task(&cmd_task->task);
1245 register_task(&stat_task->task);
1246 s.default_timeout.tv_sec = 0;
1247 s.default_timeout.tv_usec = 99 * 1000;
1248 ret = schedule(&s);
1249
1250 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1251 return EXIT_FAILURE;
1252 }