2 * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file audiod.c The paraslash's audio daemon. */
9 #include <netinet/in.h>
10 #include <sys/socket.h>
12 #include <sys/types.h>
13 #include <arpa/inet.h>
20 #include "audiod.lsg.h"
21 #include "recv_cmd.lsg.h"
27 #include "buffer_tree.h"
30 #include "grab_client.h"
41 /** Array of error strings. */
44 static struct lls_parse_result *lpr;
45 #define CMD_PTR (lls_cmd(0, audiod_suite))
46 #define OPT_RESULT(_name) (lls_opt_result(LSG_AUDIOD_PARA_AUDIOD_OPT_ ## _name, lpr))
47 #define OPT_GIVEN(_name) (lls_opt_given(OPT_RESULT(_name)))
48 #define OPT_STRING_VAL(_name) (lls_string_val(0, OPT_RESULT(_name)))
49 #define OPT_UINT32_VAL(_name) (lls_uint32_val(0, OPT_RESULT(_name)))
50 #define ENUM_STRING_VAL(_name) (lls_enum_string_val(OPT_UINT32_VAL(_name), \
51 lls_opt(LSG_AUDIOD_PARA_AUDIOD_OPT_ ## _name, CMD_PTR)))
53 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
54 /** define the array containing all supported audio formats */
55 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
57 /** Defines how audiod handles one supported audio format. */
58 struct audio_format_info {
59 /** the receiver for this audio format */
61 /** Parsed receiver command line. */
62 struct lls_parse_result *receiver_lpr;
63 /** the number of filters that should be activated for this audio format */
64 unsigned int num_filters;
65 /** Array of filter numbers to be activated. */
66 unsigned *filter_nums;
67 /** Pointer to the array of filter configurations. */
69 /** Parsed filter command line, one parse result per filter. */
70 struct lls_parse_result **filter_lpr;
71 /** the number of filters that should be activated for this audio format */
72 unsigned int num_writers;
73 /** Array of writer IDs to be activated. */
75 /** Parsed writer command line(s) */
76 struct lls_parse_result **writer_lpr;
77 /** do not start receiver/filters/writer before this time */
78 struct timeval restart_barrier;
81 /* Describes one instance of a receiver-filter-writer chain. */
83 /* Number of the audio format in this slot. */
85 /* The stream_start status item announced by para_server. */
86 struct timeval server_stream_start;
87 /* The offset status item announced by para_server. */
88 unsigned offset_seconds;
89 /* The seconds_total status item announced by para_server. */
90 unsigned seconds_total;
91 /* The receiver info associated with this slot. */
92 struct receiver_node *receiver_node;
93 /* The array of filter nodes. */
94 struct filter_node *fns;
95 /* The array of writers attached to the last filter. */
96 struct writer_node *wns;
99 #define RECEIVER_CMD(_a) lls_cmd((_a)->receiver_num, recv_cmd_suite)
100 #define RECEIVER(_a) ((const struct receiver *)lls_user_data(RECEIVER_CMD(_a)))
102 /** Maximal number of simultaneous instances. */
103 #define MAX_STREAM_SLOTS 5
105 /** Iterate over all slots. */
106 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
109 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
110 * be associated with a receiver/filter/writer triple. This array holds all
111 * information on the status of these slots.
113 * \sa struct slot_info
115 struct slot_info slot[MAX_STREAM_SLOTS];
117 /** The vss status flags audiod is interested in. */
118 enum vss_status_flags {
119 /** Whether the 'N' flag is set. */
120 VSS_STATUS_FLAG_NEXT = 1,
121 /** The 'P' flag is set. */
122 VSS_STATUS_FLAG_PLAYING = 2,
126 * The scheduler instance of para_audiod.
128 * This is needed also in audiod_command.c (for the tasks command), so it can
129 * not be made static.
131 struct sched sched = {.max_fileno = 0};
133 /* The task for obtaining para_server's status (para_client stat). */
135 /** The associated task structure of audiod. */
137 /** Client data associated with the stat task. */
138 struct client_task *ct;
139 /** Do not restart client command until this time. */
140 struct timeval restart_barrier;
141 /** Last time we received status data from para_server. */
142 struct timeval last_status_read;
144 /** The offset value announced by para_server. */
146 /** The length of the current audio file as announced by para_server. */
148 /** The start of the current stream from the view of para_server. */
149 struct timeval server_stream_start;
150 /** The average time deviation between para_server and para_audiod. */
151 struct timeval sa_time_diff;
152 /** Whether client time is ahead of server time. */
153 int sa_time_diff_sign;
154 /** The 'P' and the 'N' flags as announced by para_server. */
155 enum vss_status_flags vss_status;
156 /** Number of times the clock difference is to be checked. */
157 unsigned clock_diff_count;
158 /** When to start the next check for clock difference. */
159 struct timeval clock_diff_barrier;
160 /** Number of the audio format as announced by para_server. */
161 int current_audio_format_num;
162 /* The status task btrn is the child of the client task. */
163 struct btr_node *btrn;
166 /** The array of status items sent by para_server. */
167 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
170 * the current mode of operation of which can be changed by the on/off/cycle
171 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
173 int audiod_status = AUDIOD_ON;
175 static char *socket_name;
176 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
177 static struct signal_task *signal_task;
178 static struct status_task status_task_struct;
179 static uid_t *uid_whitelist;
182 * the task that calls the status command of para_server
184 * \sa struct status_task
186 static struct status_task *stat_task = &status_task_struct;
189 * The task for handling audiod commands.
191 * We need two listening sockets for backward compability: on Linux systems
192 * fd[0] is an abstract socket (more precisely, a socket bound to an address in
193 * the abstract namespace), and fd[1] is the usual pathname socket. On other
194 * systems, fd[0] is negative, and only the pathname socket is used.
196 * For 0.5.x we accept connections on both sockets to make sure that old
197 * para_audioc versions can still connect. New versions use only the abstract
198 * socket. Hence after v0.6.0 we can go back to a single socket, either an
199 * abstract one (Linux) or a pathname socket (all other systems).
201 struct command_task {
202 /** The local listening sockets. */
204 /** the associated task structure */
208 /** iterate over all supported audio formats */
209 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
212 * Get the audio format number.
214 * \param name The name of the audio format.
216 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
217 * \a name is not a supported audio format.
219 static int get_audio_format_num(const char *name)
223 while (para_isspace(*name))
225 FOR_EACH_AUDIO_FORMAT(i)
226 if (!strcmp(name, audio_formats[i]))
228 return -E_UNSUPPORTED_AUDIO_FORMAT;
232 * Return the flags for the \a decoder_flags status item.
234 * Allocates a string which contains one octal digit per slot. Bit zero (value
235 * 1) is set if a receiver is active. Bit one (value 2) and bit three (value 4)
236 * have the analogous meaning for filter and writer, respectively.
238 * \return String that must be freed by the caller.
240 __malloc char *audiod_get_decoder_flags(void)
243 char flags[MAX_STREAM_SLOTS + 1];
246 struct slot_info *s = &slot[i];
248 if (s->receiver_node)
256 flags[MAX_STREAM_SLOTS] = '\0';
257 return para_strdup(flags);
260 static int get_matching_audio_format_nums(const char *re)
265 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
269 FOR_EACH_AUDIO_FORMAT(i)
270 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
276 static int get_play_time_slot_num(void)
278 int i, oldest_slot = -1;
279 struct timeval oldest_wstime = {0, 0};
282 struct slot_info *s = &slot[i];
283 struct timeval wstime;
284 if (!s->wns || !s->wns[0].btrn)
286 btr_get_node_start(s->wns[0].btrn, &wstime);
287 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
289 oldest_wstime = wstime;
296 * Compute the play time based on information of the current slot.
298 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
299 * from the status items received from para_server and the start time of the
300 * (first) writer of the current slot.
302 * It has to take into account that the stream was probably not started at
303 * the beginning of the file, that the clock between the server and the client
304 * host may differ and that playback of the stream was delayed, e.g. because
305 * the prebuffer filter is used in the filter configuration.
307 * If no writer is active, for example because para_audiod runs in standby
308 * mode, an approximation based only on the status items is computed and the
309 * returned string is prefixed with "~".
311 * \return A string that must be freed by the caller.
313 char *get_time_string(void)
315 int ret, seconds = 0, length = stat_task->length_seconds;
316 struct timeval *tmp, sum, sss, /* server stream start */
317 rstime, /* receiver start time */
318 wstime, /* writer start time */
319 wtime, /* now - writer start */
320 rskip; /* receiver start - sss */
321 int slot_num = get_play_time_slot_num();
322 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
325 if (audiod_status == AUDIOD_OFF)
327 if (stat_task->server_stream_start.tv_sec == 0) {
328 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
329 goto out; /* server is about to change file */
330 if (length > 0) /* paused */
332 goto empty; /* stopped */
335 * Valid status items and playing, set length and tmp to the stream
336 * start. We use the slot info and fall back to the info from current
337 * status items if no slot info is available.
339 tmp = &stat_task->server_stream_start;
340 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
341 btr_get_node_start(s->wns[0].btrn, &wstime);
342 if (wstime.tv_sec != 0) { /* writer wrote something */
343 if (s->server_stream_start.tv_sec == 0) {
344 /* copy status info to slot */
345 s->server_stream_start = stat_task->server_stream_start;
346 s->offset_seconds = stat_task->offset_seconds;
347 s->seconds_total = stat_task->length_seconds;
349 length = s->seconds_total;
350 tmp = &s->server_stream_start;
353 if (stat_task->sa_time_diff_sign > 0)
354 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
356 tv_add(tmp, &stat_task->sa_time_diff, &sss);
357 if (!s || !s->wns || !s->wns[0].btrn || wstime.tv_sec == 0) {
359 tv_diff(now, &sss, &diff);
360 seconds = diff.tv_sec + stat_task->offset_seconds;
363 tv_diff(now, &wstime, &wtime);
364 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
365 seconds = s->offset_seconds;
366 if (s->receiver_node->btrn) {
367 btr_get_node_start(s->receiver_node->btrn, &rstime);
368 ret = tv_diff(&rstime, &sss, &rskip);
369 if (ret > 0 && rskip.tv_sec > 2) {
370 /* audiod was started in the middle of the stream */
371 tv_add(&wtime, &rskip, &sum);
372 seconds += sum.tv_sec;
374 seconds += wtime.tv_sec;
376 seconds += wtime.tv_sec;
378 seconds = PARA_MIN(seconds, length);
379 seconds = PARA_MAX(seconds, 0);
381 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
385 (length - seconds) / 60,
386 (length - seconds) % 60,
387 length? (seconds * 100 + length / 2) / length : 0,
391 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
394 return para_strdup(NULL);
397 static void parse_config_or_die(void)
400 char *cf, *errctx = NULL;
404 if (OPT_GIVEN(CONFIG_FILE))
405 cf = para_strdup(OPT_STRING_VAL(CONFIG_FILE));
407 char *home = para_homedir();
408 cf = make_message("%s/.paraslash/audiod.conf", home);
411 ret = mmap_full_file(cf, O_RDONLY, &map, &sz, NULL);
413 if (ret != -E_EMPTY && ret != -ERRNO_TO_PARA_ERROR(ENOENT))
415 if (ret == -ERRNO_TO_PARA_ERROR(ENOENT) && OPT_GIVEN(CONFIG_FILE))
420 struct lls_parse_result *cf_lpr, *merged_lpr;
421 ret = lls(lls_convert_config(map, sz, NULL, &cf_argv, &errctx));
422 para_munmap(map, sz);
426 ret = lls(lls_parse(cf_argc, cf_argv, CMD_PTR, &cf_lpr, &errctx));
427 lls_free_argv(cf_argv);
430 ret = lls(lls_merge(lpr, cf_lpr, CMD_PTR, &merged_lpr,
432 lls_free_parse_result(cf_lpr, CMD_PTR);
435 lls_free_parse_result(lpr, CMD_PTR);
438 daemon_set_loglevel(ENUM_STRING_VAL(LOGLEVEL));
439 if (OPT_GIVEN(USER_ALLOW)) {
440 uint32_t n = OPT_GIVEN(USER_ALLOW);
443 uid_whitelist = para_malloc(n * sizeof(uid_t));
444 for (i = 0; i < n; i++) {
445 const char *arg = lls_string_val(i,
446 OPT_RESULT(USER_ALLOW));
449 ret = para_atoi32(arg, &val);
451 uid_whitelist[i] = val;
454 errno = 0; /* see getpwnam(3) */
457 PARA_EMERG_LOG("invalid username: %s\n", arg);
461 uid_whitelist[i] = pw->pw_uid;
469 PARA_ERROR_LOG("%s\n", errctx);
471 lls_free_parse_result(lpr, CMD_PTR);
472 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
477 static void setup_signal_handling(void)
479 signal_task = signal_init_or_die();
480 para_install_sighandler(SIGINT);
481 para_install_sighandler(SIGTERM);
482 para_install_sighandler(SIGHUP);
483 para_sigaction(SIGPIPE, SIG_IGN);
486 static void clear_slot(int slot_num)
488 struct slot_info *s = &slot[slot_num];
490 PARA_INFO_LOG("clearing slot %d\n", slot_num);
491 memset(s, 0, sizeof(struct slot_info));
495 static void close_receiver(int slot_num)
497 struct slot_info *s = &slot[slot_num];
498 struct audio_format_info *a;
500 if (s->format < 0 || !s->receiver_node)
503 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
504 audio_formats[s->format], slot_num);
505 RECEIVER(a)->close(s->receiver_node);
506 btr_remove_node(&s->receiver_node->btrn);
507 task_reap(&s->receiver_node->task);
508 free(s->receiver_node);
509 s->receiver_node = NULL;
510 stat_task->current_audio_format_num = -1;
511 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
512 &a->restart_barrier);
515 static void writer_cleanup(struct writer_node *wn)
519 PARA_INFO_LOG("closing %s\n", writer_name(wn->wid));
520 writer_get(wn->wid)->close(wn);
521 btr_remove_node(&wn->btrn);
522 task_reap(&wn->task);
525 static void close_writers(struct slot_info *s)
527 struct audio_format_info *a;
534 if (a->num_writers == 0)
535 writer_cleanup(s->wns);
537 for (i = 0; i < a->num_writers; i++)
538 writer_cleanup(s->wns + i);
544 static void close_filters(struct slot_info *s)
547 struct audio_format_info *a = afi + s->format;
548 if (a->num_filters == 0)
550 for (i = a->num_filters - 1; i >= 0; i--) {
551 struct filter_node *fn = s->fns + i;
552 const struct filter *f;
556 f = filter_get(fn->filter_num);
559 btr_remove_node(&fn->btrn);
560 task_reap(&fn->task);
566 static void notify_receivers(int error)
571 struct slot_info *s = slot + i;
574 if (!s->receiver_node)
576 task_notify(s->receiver_node->task, error);
580 static int get_empty_slot(void)
591 if (s->wns || s->receiver_node || s->fns)
596 return -E_NO_MORE_SLOTS;
599 static void open_filters(struct slot_info *s)
601 struct audio_format_info *a = afi + s->format;
602 struct filter_node *fn;
603 int nf = a->num_filters;
604 struct btr_node *parent;
609 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
610 assert(s->fns == NULL);
611 s->fns = para_calloc(nf * sizeof(struct filter_node));
612 parent = s->receiver_node->btrn;
613 for (i = 0; i < nf; i++) {
616 const struct filter *f = filter_get(a->filter_nums[i]);
618 fn->filter_num = a->filter_nums[i];
619 fn->conf = a->filter_conf[i];
620 fn->lpr = a->filter_lpr[i];
621 name = filter_name(fn->filter_num);
622 fn->btrn = btr_new_node(&(struct btr_node_description)
623 EMBRACE(.name = name, .parent = parent,
624 .handler = f->execute, .context = fn));
628 sprintf(buf, "%s (slot %d)", name, (int)(s - slot));
629 fn->task = task_register(&(struct task_info) {
631 .pre_select = f->pre_select,
632 .post_select = f->post_select,
636 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
637 audio_formats[s->format], i, nf, name, (int)(s - slot));
641 static void open_writers(struct slot_info *s)
644 struct audio_format_info *a = afi + s->format;
645 struct writer_node *wn;
646 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
648 assert(s->wns == NULL);
649 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
650 * sizeof(struct writer_node));
651 for (i = 0; i < a->num_writers; i++) {
653 wn->wid = a->wids[i];
654 wn->lpr = a->writer_lpr[i];
655 register_writer_node(wn, parent, &sched);
656 PARA_NOTICE_LOG("%s writer started in slot %d\n",
657 writer_name(a->wids[i]), (int)(s - slot));
661 /* returns slot num on success */
662 static int open_receiver(int format)
664 struct audio_format_info *a = &afi[format];
667 const struct receiver *r = RECEIVER(a);
668 const char *name = lls_command_name(RECEIVER_CMD(a));
669 struct receiver_node *rn;
671 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
672 ret = get_empty_slot();
676 rn = para_calloc(sizeof(*rn));
678 rn->lpr = a->receiver_lpr;
679 rn->btrn = btr_new_node(&(struct btr_node_description)
680 EMBRACE(.name = name, .context = rn));
683 btr_remove_node(&rn->btrn);
689 s->receiver_node = rn;
690 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
691 audio_formats[format], name, slot_num);
692 rn->task = task_register(&(struct task_info) {
694 .pre_select = r->pre_select,
695 .post_select = r->post_select,
701 static bool receiver_running(void)
704 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
707 struct slot_info *s = &slot[i];
708 long unsigned ss2 = s->server_stream_start.tv_sec;
710 if (!s->receiver_node)
712 if (task_status(s->receiver_node->task) >= 0)
721 * Return the root node of the current buffer tree.
723 * This is only used for stream grabbing.
725 * \return \p NULL if no slot is currently active. If more than one buffer tree
726 * exists, the node corresponding to the most recently started receiver is
729 struct btr_node *audiod_get_btr_root(void)
731 int i, newest_slot = -1;
732 struct timeval newest_rstime = {0, 0};
735 struct slot_info *s = &slot[i];
736 struct timeval rstime;
737 if (!s->receiver_node)
739 if (task_status(s->receiver_node->task) < 0)
741 btr_get_node_start(s->receiver_node->btrn, &rstime);
742 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
744 newest_rstime = rstime;
747 if (newest_slot == -1)
749 return slot[newest_slot].receiver_node->btrn;
752 /* whether a new instance of a decoder should be started. */
753 static bool must_start_decoder(void)
755 int cafn = stat_task->current_audio_format_num;
756 unsigned vs = stat_task->vss_status;
758 if (audiod_status != AUDIOD_ON)
764 if (vs & VSS_STATUS_FLAG_NEXT)
766 if (!(vs & VSS_STATUS_FLAG_PLAYING))
768 if (receiver_running())
770 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
775 static void compute_time_diff(const struct timeval *status_time)
777 struct timeval tmp, diff;
778 static unsigned count;
779 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
780 const struct timeval max_deviation = {0, 500 * 1000};
781 const int time_smooth = 5;
783 sign = tv_diff(status_time, now, &diff);
784 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
785 // sign, sa_time_diff_sign);
787 sa_time_diff_sign = sign;
788 stat_task->sa_time_diff = diff;
793 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
794 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
795 PARA_WARNING_LOG("time diff jump: %lums\n",
799 sa_time_diff_sign = tv_convex_combination(
800 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
801 count > 10? sign : sign * time_smooth, &diff,
803 stat_task->sa_time_diff = tmp;
804 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
807 sa_time_diff_sign < 0? "-" : "+",
808 tv2ms(&stat_task->sa_time_diff)
811 stat_task->sa_time_diff_sign = sa_time_diff_sign;
814 static int update_item(int itemnum, char *buf)
816 long unsigned sec, usec;
818 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
820 free(stat_item_values[itemnum]);
821 stat_item_values[itemnum] = para_strdup(buf);
822 stat_client_write_item(itemnum);
824 case SI_STATUS_FLAGS:
825 stat_task->vss_status = 0;
826 if (strchr(buf, 'N'))
827 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
828 if (strchr(buf, 'P'))
829 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
832 stat_task->offset_seconds = atoi(buf);
834 case SI_SECONDS_TOTAL:
835 stat_task->length_seconds = atoi(buf);
837 case SI_STREAM_START:
838 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
839 stat_task->server_stream_start.tv_sec = sec;
840 stat_task->server_stream_start.tv_usec = usec;
843 case SI_CURRENT_TIME:
844 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
845 struct timeval tv = {sec, usec};
846 compute_time_diff(&tv);
850 stat_task->current_audio_format_num
851 = get_audio_format_num(buf);
856 static int parse_stream_command(const char *txt, const char **cmd)
859 char *re, *p = strchr(txt, ':');
862 return -E_MISSING_COLON;
865 re = malloc(len + 1);
866 strncpy(re, txt, len);
868 ret = get_matching_audio_format_nums(re);
873 static int add_filter(int format, const char *cmdline)
875 struct audio_format_info *a = &afi[format];
876 int filter_num, nf = a->num_filters;
878 struct lls_parse_result *flpr;
880 filter_num = filter_setup(cmdline, &cfg, &flpr);
881 a->filter_lpr = para_realloc(a->filter_lpr,
882 (nf + 1) * sizeof(flpr));
883 a->filter_conf = para_realloc(a->filter_conf,
884 (nf + 1) * sizeof(void *));
885 a->filter_nums = para_realloc(a->filter_nums,
886 (nf + 1) * sizeof(unsigned));
888 a->filter_nums[nf] = filter_num;
889 a->filter_conf[nf] = cfg;
890 a->filter_lpr[nf] = flpr;
892 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
893 filter_name(filter_num));
897 static int parse_writer_args(void)
901 struct audio_format_info *a;
903 for (i = 0; i < OPT_GIVEN(WRITER); i++) {
906 ret = parse_stream_command(lls_string_val(i,
907 OPT_RESULT(WRITER)), &cmd);
911 FOR_EACH_AUDIO_FORMAT(j) {
913 if ((af_mask & (1 << j)) == 0) /* no match */
916 a->wids = para_realloc(a->wids, (nw + 1) * sizeof(int));
917 a->writer_lpr = para_realloc(a->writer_lpr,
918 (nw + 1) * sizeof(struct lls_parse_result *));
919 a->wids[nw] = check_writer_arg_or_die(cmd,
921 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
922 nw, writer_name(a->wids[nw]));
926 /* Use default writer for audio formats which are not yet set up. */
927 FOR_EACH_AUDIO_FORMAT(i) {
929 if (a->num_writers > 0)
930 continue; /* already set up */
932 a->wids = para_malloc(sizeof(int));
933 a->writer_lpr = para_malloc(sizeof(struct lls_parse_result *));
934 a->wids[0] = check_writer_arg_or_die(NULL, a->writer_lpr);
935 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
936 writer_name(a->wids[0]));
941 static int parse_receiver_args(void)
945 struct audio_format_info *a;
947 FOR_EACH_AUDIO_FORMAT(i)
948 afi[i].receiver_num = -1;
949 for (i = OPT_GIVEN(RECEIVER) - 1; i >= 0; i--) {
952 ret = parse_stream_command(lls_string_val(i,
953 OPT_RESULT(RECEIVER)), &arg);
957 FOR_EACH_AUDIO_FORMAT(j) {
959 if ((af_mask & (1 << j)) == 0) /* no match */
962 * If multiple receivers are given for this audio format, the
963 * last one wins and we have to free the previous receiver
964 * config here. Since we are iterating backwards, the winning
965 * receiver arg is in fact the first one given.
967 lls_free_parse_result(a->receiver_lpr, RECEIVER_CMD(a));
968 a->receiver_num = check_receiver_arg(arg, &a->receiver_lpr);
972 * Use the default receiver for those audio formats for which no
973 * receiver was specified.
975 FOR_EACH_AUDIO_FORMAT(i) {
977 if (a->receiver_num >= 0)
979 a->receiver_num = check_receiver_arg(NULL, &a->receiver_lpr);
981 FOR_EACH_AUDIO_FORMAT(i) {
983 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
984 audio_formats[i], lls_command_name(RECEIVER_CMD(a)));
991 static int init_default_filters(void)
995 FOR_EACH_AUDIO_FORMAT(i) {
996 struct audio_format_info *a = &afi[i];
997 const char *name = lls_command_name(RECEIVER_CMD(a));
1002 continue; /* no default -- nothing to to */
1004 * udp and dccp streams are fec-encoded, so add fecdec as the
1007 if (strcmp(name, "udp") == 0 || strcmp(name, "dccp") == 0) {
1008 tmp = para_strdup("fecdec");
1014 /* add "dec" to audio format name */
1015 tmp = make_message("%sdec", audio_formats[i]);
1016 for (j = 0; filter_get(j); j++)
1017 if (!strcmp(tmp, filter_name(j)))
1020 ret = -E_UNSUPPORTED_FILTER;
1023 tmp = para_strdup(filter_name(j));
1024 ret = add_filter(i, tmp);
1028 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1035 static int parse_filter_args(void)
1037 int i, j, ret, af_mask, num_matches;
1039 for (i = 0; i < OPT_GIVEN(FILTER); i++) {
1041 ret = parse_stream_command(lls_string_val(i,
1042 OPT_RESULT(FILTER)), &arg);
1047 FOR_EACH_AUDIO_FORMAT(j) {
1048 if ((af_mask & (1 << j)) == 0) /* no match */
1050 ret = add_filter(j, arg);
1055 if (num_matches == 0)
1056 PARA_WARNING_LOG("ignoring filter spec: %s\n",
1057 lls_string_val(i, OPT_RESULT(FILTER)));
1059 ret = init_default_filters(); /* use default values for the rest */
1064 static int parse_stream_args(void)
1068 ret = parse_receiver_args();
1071 ret = parse_filter_args();
1074 ret = parse_writer_args();
1080 /* does not unlink socket on errors */
1081 static void init_local_sockets(struct command_task *ct)
1083 if (OPT_GIVEN(SOCKET))
1084 socket_name = para_strdup(OPT_STRING_VAL(SOCKET));
1086 char *hn = para_hostname();
1087 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1091 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1092 if (OPT_GIVEN(FORCE))
1093 unlink(socket_name);
1094 ct->fd[0] = create_local_socket(socket_name, 0);
1095 ct->fd[1] = create_local_socket(socket_name,
1096 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
1097 if (ct->fd[0] >= 0 || ct->fd[1] >= 0)
1099 PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd[1]));
1103 static int signal_post_select(struct sched *s, void *context)
1105 struct signal_task *st = context;
1108 ret = task_get_notification(st->task);
1111 signum = para_next_signal(&s->rfds);
1116 PARA_NOTICE_LOG("received signal %d\n", signum);
1117 task_notify_all(s, E_AUDIOD_SIGNAL);
1118 return -E_AUDIOD_SIGNAL;
1123 static void command_pre_select(struct sched *s, void *context)
1125 struct command_task *ct = context;
1128 for (i = 0; i < 2; i++)
1130 para_fd_set(ct->fd[i], &s->rfds, &s->max_fileno);
1133 static int command_post_select(struct sched *s, void *context)
1136 struct command_task *ct = context;
1137 static struct timeval last_status_dump;
1138 struct timeval tmp, delay;
1141 ret = task_get_notification(ct->task);
1144 for (i = 0; i < 2; i++) {
1147 ret = handle_connect(ct->fd[i], &s->rfds);
1149 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1150 if (ret == -E_AUDIOD_TERM) {
1151 task_notify_all(s, -ret);
1160 /* if last status dump was less than 500ms ago, do nothing */
1162 delay.tv_usec = 500 * 1000;
1163 tv_add(&last_status_dump, &delay, &tmp);
1164 if (tv_diff(now, &tmp, NULL) < 0)
1168 * If last status dump was more than 5s ago, force update. Otherwise,
1169 * update only those items that have changed.
1173 tv_add(&last_status_dump, &delay, &tmp);
1174 if (tv_diff(now, &tmp, NULL) > 0)
1177 audiod_status_dump(force);
1178 last_status_dump = *now;
1182 static void init_command_task(struct command_task *ct)
1184 init_local_sockets(ct); /* doesn't return on errors */
1186 ct->task = task_register(&(struct task_info) {
1188 .pre_select = command_pre_select,
1189 .post_select = command_post_select,
1194 static void close_stat_pipe(void)
1198 task_reap(&stat_task->ct->task);
1199 client_close(stat_task->ct);
1200 stat_task->ct = NULL;
1201 clear_and_dump_items();
1202 stat_task->length_seconds = 0;
1203 stat_task->offset_seconds = 0;
1204 stat_task->vss_status = 0;
1205 stat_task->current_audio_format_num = -1;
1206 audiod_status_dump(true);
1209 /* avoid busy loop if server is down */
1210 static void set_stat_task_restart_barrier(unsigned seconds)
1212 struct timeval delay = {seconds, 0};
1213 tv_add(now, &delay, &stat_task->restart_barrier);
1216 static bool must_close_slot(int slot_num)
1218 struct slot_info *s = &slot[slot_num];
1219 struct audio_format_info *a = afi + s->format;
1224 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1226 for (i = 0; i < a->num_filters; i++)
1227 if (s->fns && task_status(s->fns[i].task) >= 0)
1229 if (a->num_writers > 0) {
1230 for (i = 0; i < a->num_writers; i++)
1231 if (s->wns && task_status(s->wns[i].task) >= 0)
1234 if (s->wns && task_status(s->wns[0].task) >= 0)
1240 static void close_slot(int slot_num)
1242 struct slot_info *s = slot + slot_num;
1244 PARA_INFO_LOG("closing slot %d\n", slot_num);
1247 close_receiver(slot_num);
1248 clear_slot(slot_num);
1251 static void close_unused_slots(void)
1257 if (must_close_slot(i)) {
1262 audiod_status_dump(true);
1266 * Cleanup all resources.
1268 * This performs various cleanups, removes the audiod socket and closes the
1269 * connection to para_server.
1271 static void audiod_cleanup(void)
1274 unlink(socket_name);
1276 close_unused_slots();
1277 close_stat_clients();
1278 free(uid_whitelist);
1282 * Check if any receivers/filters/writers need to be started and do so if
1285 static void start_stop_decoders(void)
1288 struct slot_info *sl;
1290 close_unused_slots();
1291 if (audiod_status != AUDIOD_ON ||
1292 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1293 return notify_receivers(E_NOT_PLAYING);
1294 if (!must_start_decoder())
1296 ret = open_receiver(stat_task->current_audio_format_num);
1298 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1304 activate_grab_clients(&sched);
1305 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1306 audiod_status_dump(true);
1309 static void status_pre_select(struct sched *s, void *context)
1311 struct status_task *st = context;
1312 int i, ret, cafn = stat_task->current_audio_format_num;
1314 if (must_start_decoder())
1317 if (must_close_slot(i))
1319 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1322 if (st->ct && audiod_status == AUDIOD_OFF)
1324 if (!st->ct && audiod_status != AUDIOD_OFF)
1325 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1327 sched_request_barrier(&afi[cafn].restart_barrier, s);
1329 * If para_server is playing we'd like to have a smooth time display
1330 * even if we are running in standby mode. So we request a timeout that
1331 * expires at the next full second.
1333 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1334 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1340 /* restart the client task if necessary */
1341 static int status_post_select(struct sched *s, void *context)
1343 struct status_task *st = context;
1346 ret = task_get_notification(st->task);
1349 if (audiod_status == AUDIOD_OFF) {
1352 if (task_status(st->ct->task) >= 0) {
1353 task_notify(st->ct->task, E_AUDIOD_OFF);
1357 st->clock_diff_count = OPT_UINT32_VAL(CLOCK_DIFF_COUNT);
1364 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1369 if (st->ct->status != CL_EXECUTING)
1372 struct timeval diff;
1373 tv_diff(now, &st->last_status_read, &diff);
1374 if (diff.tv_sec > 61)
1375 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1378 btr_merge(st->btrn, st->min_iqs);
1379 sz = btr_next_buffer(st->btrn, &buf);
1380 ret = for_each_stat_item(buf, sz, update_item);
1382 task_notify(st->ct->task, -ret);
1386 btr_consume(st->btrn, sz - ret);
1387 st->last_status_read = *now;
1389 } else /* current status item crosses buffers */
1390 st->min_iqs = sz + 1;
1393 btr_drain(st->btrn);
1394 st->current_audio_format_num = -1;
1395 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1397 if (st->clock_diff_count) { /* get status only one time */
1398 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1400 PARA_INFO_LOG("clock diff count: %u\n", st->clock_diff_count);
1401 st->clock_diff_count--;
1402 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1403 set_stat_task_restart_barrier(2);
1406 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1408 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1409 set_stat_task_restart_barrier(5);
1411 free(stat_item_values[SI_BASENAME]);
1412 stat_item_values[SI_BASENAME] = para_strdup(
1413 "no connection to para_server");
1414 stat_client_write_item(SI_BASENAME);
1415 st->last_status_read = *now;
1417 start_stop_decoders();
1421 static void init_status_task(struct status_task *st)
1423 memset(st, 0, sizeof(struct status_task));
1424 st->sa_time_diff_sign = 1;
1425 st->clock_diff_count = OPT_UINT32_VAL(CLOCK_DIFF_COUNT);
1426 st->current_audio_format_num = -1;
1427 st->btrn = btr_new_node(&(struct btr_node_description)
1428 EMBRACE(.name = "stat"));
1430 stat_task->task = task_register(&(struct task_info) {
1432 .pre_select = status_pre_select,
1433 .post_select = status_post_select,
1434 .context = stat_task,
1438 static void set_initial_status(void)
1440 audiod_status = AUDIOD_ON;
1441 if (!OPT_GIVEN(MODE))
1443 if (!strcmp(OPT_STRING_VAL(MODE), "sb")) {
1444 audiod_status = AUDIOD_STANDBY;
1447 if (!strcmp(OPT_STRING_VAL(MODE), "off")) {
1448 audiod_status = AUDIOD_OFF;
1451 if (strcmp(OPT_STRING_VAL(MODE), "on"))
1452 PARA_WARNING_LOG("invalid mode\n");
1456 * Lookup the given UID in the whitelist.
1458 * The whitelist is the array of arguments to the --user-allow opion. If the
1459 * option was not given, the array is empty, in which case the check succeeds.
1461 * \param uid User ID to look up.
1463 * \return True if --user-allow was not given, or if uid matches an element of
1466 bool uid_is_whitelisted(uid_t uid)
1470 if (!OPT_GIVEN(USER_ALLOW))
1472 for (i = 0; i < OPT_GIVEN(USER_ALLOW); i++)
1473 if (uid == uid_whitelist[i])
1478 static void handle_help_flags(void)
1481 bool d = OPT_GIVEN(DETAILED_HELP);
1484 help = lls_long_help(CMD_PTR);
1485 else if (OPT_GIVEN(HELP))
1486 help = lls_short_help(CMD_PTR);
1489 printf("%s\n", help);
1491 print_receiver_helps(d);
1492 print_filter_helps(d);
1493 print_writer_helps(d);
1498 * the main function of para_audiod
1500 * \param argc usual argument count
1501 * \param argv usual argument vector
1503 * \return EXIT_SUCCESS or EXIT_FAILURE
1505 * \sa para_audiod(1)
1507 int main(int argc, char *argv[])
1510 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1514 ret = lls(lls_parse(argc, argv, CMD_PTR, &lpr, &errctx));
1517 daemon_set_loglevel(ENUM_STRING_VAL(LOGLEVEL));
1518 daemon_drop_privileges_or_die(OPT_STRING_VAL(USER),
1519 OPT_STRING_VAL(GROUP));
1520 version_handle_flag("audiod", OPT_GIVEN(VERSION));
1521 handle_help_flags();
1522 parse_config_or_die();
1523 init_random_seed_or_die();
1524 daemon_set_priority(OPT_UINT32_VAL(PRIORITY));
1526 if (daemon_init_colors_or_die(OPT_UINT32_VAL(COLOR), COLOR_AUTO,
1527 COLOR_NO, OPT_GIVEN(LOGFILE))) {
1528 for (i = 0; i < OPT_GIVEN(LOG_COLOR); i++)
1529 daemon_set_log_color_or_die(lls_string_val(i,
1530 OPT_RESULT(LOG_COLOR)));
1532 daemon_set_flag(DF_LOG_TIME);
1533 daemon_set_flag(DF_LOG_HOSTNAME);
1534 daemon_set_flag(DF_LOG_LL);
1535 if (OPT_GIVEN(LOG_TIMING))
1536 daemon_set_flag(DF_LOG_TIMING);
1537 if (OPT_GIVEN(LOGFILE)) {
1538 daemon_set_logfile(OPT_STRING_VAL(LOGFILE));
1539 daemon_open_log_or_die();
1541 ret = parse_stream_args();
1543 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1546 daemon_log_welcome("audiod");
1547 daemon_set_start_time();
1548 set_initial_status();
1551 setup_signal_handling();
1553 init_status_task(stat_task);
1554 init_command_task(cmd_task);
1556 if (OPT_GIVEN(DAEMON))
1557 daemonize(false /* parent exits immediately */);
1559 signal_task->task = task_register(&(struct task_info) {
1561 .pre_select = signal_pre_select,
1562 .post_select = signal_post_select,
1563 .context = signal_task,
1566 sched.default_timeout.tv_sec = 2;
1567 sched.default_timeout.tv_usec = 999 * 1000;
1568 ret = schedule(&sched);
1570 sched_shutdown(&sched);
1571 signal_shutdown(signal_task);
1574 lls_free_parse_result(lpr, CMD_PTR);
1576 PARA_ERROR_LOG("%s\n", errctx);
1578 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1579 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;