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460b9539 1/*
2 * This file is part of DisOrder.
3 * Copyright (C) 2004, 2005, 2006 Richard Kettlewell
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
20
21#include <config.h>
22
23#include <sys/types.h>
24#include <sys/time.h>
25#include <unistd.h>
26#include <errno.h>
27#include <fnmatch.h>
28#include <time.h>
29#include <signal.h>
30#include <stdlib.h>
31#include <assert.h>
32#include <sys/socket.h>
33#include <string.h>
34#include <stdio.h>
35#include <pcre.h>
36#include <ao/ao.h>
37
38#include "event.h"
39#include "log.h"
40#include "mem.h"
41#include "configuration.h"
42#include "queue.h"
43#include "trackdb.h"
44#include "play.h"
45#include "plugin.h"
46#include "wstat.h"
47#include "eventlog.h"
48#include "logfd.h"
49#include "syscalls.h"
50#include "speaker.h"
51#include "disorder.h"
52#include "signame.h"
53#include "hash.h"
54
55#define SPEAKER "disorder-speaker"
56
57struct queue_entry *playing;
58int paused;
59
60static void finished(ev_source *ev);
61
62static int speaker_fd = -1;
63static hash *player_pids;
64static int shutting_down;
65
66static void store_player_pid(const char *id, pid_t pid) {
67 if(!player_pids) player_pids = hash_new(sizeof (pid_t));
68 hash_add(player_pids, id, &pid, HASH_INSERT_OR_REPLACE);
69}
70
71static pid_t find_player_pid(const char *id) {
72 pid_t *pidp;
73
74 if(player_pids && (pidp = hash_find(player_pids, id))) return *pidp;
75 return -1;
76}
77
78static void forget_player_pid(const char *id) {
79 if(player_pids) hash_remove(player_pids, id);
80}
81
82/* called when speaker process terminates */
83static int speaker_terminated(ev_source attribute((unused)) *ev,
84 pid_t attribute((unused)) pid,
85 int attribute((unused)) status,
86 const struct rusage attribute((unused)) *rusage,
87 void attribute((unused)) *u) {
88 if(status)
89 error(0, "speaker subprocess terminated with status %s",
90 wstat(status));
91 return 0;
92}
93
94/* called when speaker process has something to say */
95static int speaker_readable(ev_source *ev, int fd,
96 void attribute((unused)) *u) {
97 struct speaker_message sm;
98 int ret = speaker_recv(fd, &sm, 0);
99
100 if(ret < 0) return 0; /* EAGAIN */
101 if(!ret) { /* EOF */
102 ev_fd_cancel(ev, ev_read, fd);
103 return 0;
104 }
105 switch(sm.type) {
106 case SM_PAUSED:
107 /* track ID is paused, DATA seconds played */
108 D(("SM_PAUSED %s %ld", sm.id, sm.data));
109 playing->sofar = sm.data;
110 break;
111 case SM_FINISHED:
112 /* the playing track finished */
113 D(("SM_FINISHED %s", sm.id));
114 finished(ev);
115 break;
116 case SM_PLAYING:
117 /* track ID is playing, DATA seconds played */
118 D(("SM_PLAYING %s %ld", sm.id, sm.data));
119 playing->sofar = sm.data;
120 break;
121 default:
122 error(0, "unknown message type %d", sm.type);
123 }
124 return 0;
125}
126
127void speaker_setup(ev_source *ev) {
128 int sp[2], lfd;
129 pid_t pid;
130
131 if(socketpair(PF_UNIX, SOCK_DGRAM, 0, sp) < 0)
132 fatal(errno, "error calling socketpair");
133 if(!isatty(2))
134 lfd = logfd(ev, SPEAKER);
135 else
136 lfd = -1;
137 if(!(pid = xfork())) {
138 exitfn = _exit;
139 ev_signal_atfork(ev);
140 xdup2(sp[0], 0);
141 xdup2(sp[0], 1);
142 xclose(sp[0]);
143 xclose(sp[1]);
144 if(lfd != -1) {
145 xdup2(lfd, 2);
146 xclose(lfd);
147 }
148 signal(SIGPIPE, SIG_DFL);
149#if 0
150 execlp("valgrind", "valgrind", SPEAKER, "--config", configfile,
151 debugging ? "--debug" : "--no-debug", (char *)0);
152#else
153 execlp(SPEAKER, SPEAKER, "--config", configfile,
154 debugging ? "--debug" : "--no-debug", (char *)0);
155#endif
156 fatal(errno, "error invoking %s", SPEAKER);
157 }
158 ev_child(ev, pid, 0, speaker_terminated, 0);
159 speaker_fd = sp[1];
160 xclose(sp[0]);
161 cloexec(speaker_fd);
162 /* Don't need to make speaker_fd nonblocking because speaker_recv() uses
163 * MSG_DONTWAIT. */
164 ev_fd(ev, ev_read, speaker_fd, speaker_readable, 0);
165}
166
167void speaker_reload(void) {
168 struct speaker_message sm;
169
170 memset(&sm, 0, sizeof sm);
171 sm.type = SM_RELOAD;
172 speaker_send(speaker_fd, &sm, -1);
173}
174
175/* timeout for play retry */
176static int play_again(ev_source *ev,
177 const struct timeval attribute((unused)) *now,
178 void attribute((unused)) *u) {
179 D(("play_again"));
180 play(ev);
181 return 0;
182}
183
184/* try calling play() again after @offset@ seconds */
185static void retry_play(ev_source *ev, int offset) {
186 struct timeval w;
187
188 D(("retry_play(%d)", offset));
189 gettimeofday(&w, 0);
190 w.tv_sec += offset;
191 ev_timeout(ev, 0, &w, play_again, 0);
192}
193
194/* Called when the currently playing track finishes playing. This
195 * might be because the player finished or because the speaker process
196 * told us so. */
197static void finished(ev_source *ev) {
198 D(("finished playing=%p", (void *)playing));
199 if(!playing)
200 return;
201 if(playing->state != playing_scratched)
202 notify_not_scratched(playing->track, playing->submitter);
203 switch(playing->state) {
204 case playing_ok:
205 eventlog("completed", playing->track, (char *)0);
206 break;
207 case playing_scratched:
208 eventlog("scratched", playing->track, playing->scratched, (char *)0);
209 break;
210 case playing_failed:
211 eventlog("failed", playing->track, wstat(playing->wstat), (char *)0);
212 break;
213 default:
214 break;
215 }
216 queue_played(playing);
217 recent_write();
218 forget_player_pid(playing->id);
219 playing = 0;
220 if(ev) retry_play(ev, config->gap);
221}
222
223/* Called when a player terminates. */
224static int player_finished(ev_source *ev,
225 pid_t pid,
226 int status,
227 const struct rusage attribute((unused)) *rusage,
228 void *u) {
229 struct queue_entry *q = u;
230
231 D(("player_finished pid=%lu status=%#x",
232 (unsigned long)pid, (unsigned)status));
233 /* Record that this PID is dead. If we killed the track we might know this
234 * already, but also it might have exited or crashed. Either way we don't
235 * want to end up signalling it. */
236 if(pid == find_player_pid(q->id))
237 forget_player_pid(q->id);
238 switch(q->state) {
239 case playing_unplayed:
240 case playing_random:
241 /* If this was an SM_PREPARE track then either it failed or we deliberately
242 * stopped it because it was removed from the queue or moved down it. So
243 * leave it state alone for future use. */
244 break;
245 default:
246 /* We actually started playing this track. */
247 if(status) {
248 if(q->state != playing_scratched)
249 q->state = playing_failed;
250 } else
251 q->state = playing_ok;
252 break;
253 }
254 /* Regardless we always report and record the status and do cleanup for
255 * prefork calls. */
256 if(status)
257 error(0, "player for %s %s", q->track, wstat(status));
258 if(q->type & DISORDER_PLAYER_PREFORK)
259 play_cleanup(q->pl, q->data);
260 q->wstat = status;
261 /* If this actually was the current track, and does not use the speaker
262 * process, then it must have finished. For raw-output players we will get a
263 * separate notification from the speaker process. */
264 if(q == playing
265 && (q->type & DISORDER_PLAYER_TYPEMASK) != DISORDER_PLAYER_RAW)
266 finished(ev);
267 return 0;
268}
269
270/* Find the player for Q */
271static int find_player(const struct queue_entry *q) {
272 int n;
273
274 for(n = 0; n < config->player.n; ++n)
275 if(fnmatch(config->player.s[n].s[0], q->track, 0) == 0)
276 break;
277 if(n >= config->player.n)
278 return -1;
279 else
280 return n;
281}
282
283/* Return values from start() */
284#define START_OK 0 /* Succeeded. */
285#define START_HARDFAIL 1 /* Track is broken. */
286#define START_SOFTFAIL 2 /* Track OK, system (temporarily?) broken */
287
288/* Play or prepare Q */
289static int start(ev_source *ev,
290 struct queue_entry *q,
291 int smop) {
292 int n, lfd;
293 const char *p;
294 int sp[2];
295 struct speaker_message sm;
296 char buffer[64];
297 int optc;
298 ao_sample_format format;
299 ao_device *device;
300 int retries;
301 struct timespec ts;
302 const char *waitdevice = 0;
303 const char *const *optv;
304 pid_t pid;
305
306 memset(&sm, 0, sizeof sm);
307 if(find_player_pid(q->id) > 0) {
308 if(smop == SM_PREPARE) return START_OK;
309 /* We have already sent an SM_PREPARE for this track so we just need to
310 * tell the speaker process to start actually playing the queued up audio
311 * data */
312 strcpy(sm.id, q->id);
313 sm.type = SM_PLAY;
314 speaker_send(speaker_fd, &sm, -1);
315 return START_OK;
316 }
317 /* Find the player plugin. */
318 if((n = find_player(q)) < 0) return START_HARDFAIL;
319 if(!(q->pl = open_plugin(config->player.s[n].s[1], 0)))
320 return START_HARDFAIL;
321 q->type = play_get_type(q->pl);
322 /* Can't prepare non-raw tracks. */
323 if(smop == SM_PREPARE
324 && (q->type & DISORDER_PLAYER_TYPEMASK) != DISORDER_PLAYER_RAW)
325 return START_OK;
326 /* Call the prefork function. */
327 p = trackdb_rawpath(q->track);
328 if(q->type & DISORDER_PLAYER_PREFORK)
329 if(!(q->data = play_prefork(q->pl, p))) {
330 error(0, "prefork function for %s failed", q->track);
331 return START_HARDFAIL;
332 }
333 /* Use the second arg as the tag if available (it's probably a command name),
334 * otherwise the module name. */
335 lfd = logfd(ev, (config->player.s[n].s[2]
336 ? config->player.s[n].s[2] : config->player.s[n].s[1]));
337 optc = config->player.s[n].n - 2;
338 optv = (void *)&config->player.s[n].s[2];
339 while(optc > 0 && optv[0][0] == '-') {
340 if(!strcmp(optv[0], "--")) {
341 ++optv;
342 --optc;
343 break;
344 }
345 if(!strcmp(optv[0], "--wait-for-device")
346 || !strncmp(optv[0], "--wait-for-device=", 18)) {
347 if((waitdevice = strchr(optv[0], '='))) {
348 ++waitdevice;
349 } else
350 waitdevice = ""; /* use default */
351 ++optv;
352 --optc;
353 } else {
354 error(0, "unknown option %s", optv[0]);
355 return START_HARDFAIL;
356 }
357 }
358 switch(pid = fork()) {
359 case 0: /* child */
360 exitfn = _exit;
361 ev_signal_atfork(ev);
362 signal(SIGPIPE, SIG_DFL);
363 xdup2(lfd, 1);
364 xdup2(lfd, 2);
365 xclose(lfd); /* tidy up */
366 setpgid(0, 0);
367 if((q->type & DISORDER_PLAYER_TYPEMASK) == DISORDER_PLAYER_RAW) {
368 /* Raw format players write down a pipe (in fact a socket) to
369 * the speaker process. */
370 sm.type = smop;
371 strcpy(sm.id, q->id);
372 if(socketpair(PF_UNIX, SOCK_STREAM, 0, sp) < 0)
373 fatal(errno, "error calling socketpair");
374 xshutdown(sp[0], SHUT_WR);
375 xshutdown(sp[1], SHUT_RD);
376 speaker_send(speaker_fd, &sm, sp[0]);
377 /* Pass the file descriptor to the driver in an environment
378 * variable. */
379 snprintf(buffer, sizeof buffer, "DISORDER_RAW_FD=%d", sp[1]);
380 if(putenv(buffer) < 0)
381 fatal(errno, "error calling putenv");
382 xclose(sp[0]);
383 }
384 if(waitdevice) {
385 ao_initialize();
386 if(*waitdevice) {
387 n = ao_driver_id(waitdevice);
388 if(n == -1)
389 fatal(0, "invalid libao driver: %s", optv[0]);
390 } else
391 n = ao_default_driver_id();
392 /* Make up a format. */
393 memset(&format, 0, sizeof format);
394 format.bits = 8;
395 format.rate = 44100;
396 format.channels = 1;
397 format.byte_format = AO_FMT_NATIVE;
398 retries = 20;
399 ts.tv_sec = 0;
400 ts.tv_nsec = 100000000; /* 0.1s */
401 while((device = ao_open_live(n, &format, 0)) == 0 && retries-- > 0)
402 nanosleep(&ts, 0);
403 if(device)
404 ao_close(device);
405 }
406 play_track(q->pl,
407 optv, optc,
408 p,
409 q->track);
410 _exit(0);
411 case -1: /* error */
412 error(errno, "error calling fork");
413 if(q->type & DISORDER_PLAYER_PREFORK)
414 play_cleanup(q->pl, q->data); /* else would leak */
415 xclose(lfd);
416 return START_SOFTFAIL;
417 }
418 store_player_pid(q->id, pid);
419 xclose(lfd);
420 setpgid(pid, pid);
421 ev_child(ev, pid, 0, player_finished, q);
422 D(("player subprocess ID %lu", (unsigned long)pid));
423 return START_OK;
424}
425
426int prepare(ev_source *ev,
427 struct queue_entry *q) {
428 int n;
429
430 /* Find the player plugin */
431 if(find_player_pid(q->id) > 0) return 0; /* Already going. */
432 if((n = find_player(q)) < 0) return -1; /* No player */
433 q->pl = open_plugin(config->player.s[n].s[1], 0); /* No player */
434 q->type = play_get_type(q->pl);
435 if((q->type & DISORDER_PLAYER_TYPEMASK) != DISORDER_PLAYER_RAW)
436 return 0; /* Not a raw player */
437 return start(ev, q, SM_PREPARE); /* Prepare it */
438}
439
440void abandon(ev_source attribute((unused)) *ev,
441 struct queue_entry *q) {
442 struct speaker_message sm;
443 pid_t pid = find_player_pid(q->id);
444
445 if(pid < 0) return; /* Not prepared. */
446 if((q->type & DISORDER_PLAYER_TYPEMASK) != DISORDER_PLAYER_RAW)
447 return; /* Not a raw player. */
448 /* Terminate the player. */
449 kill(-pid, config->signal);
450 forget_player_pid(q->id);
451 /* Cancel the track. */
452 memset(&sm, 0, sizeof sm);
453 sm.type = SM_CANCEL;
454 strcpy(sm.id, q->id);
455 speaker_send(speaker_fd, &sm, -1);
456}
457
458int add_random_track(void) {
459 struct queue_entry *q;
460 const char *p;
461
462 /* If random play is not enabled then do nothing. */
463 if(shutting_down || !random_is_enabled())
464 return 0;
465 /* If there is already a random track, do nothing. */
466 for(q = qhead.next; q != &qhead; q = q->next)
467 if(q->state == playing_random)
468 return 0;
469 /* Try to pick a random track */
470 if(!(p = trackdb_random(16)))
471 return -1;
472 /* Add it to the end of the queue. */
473 q = queue_add(p, 0, WHERE_END);
474 q->state = playing_random;
475 /* Commit the queue */
476 queue_write();
477 D(("picked %p (%s) at random", (void *)q, q->track));
478 return 0;
479}
480
481/* try to play a track */
482void play(ev_source *ev) {
483 struct queue_entry *q;
484 int random_enabled = random_is_enabled();
485
486 D(("play playing=%p", (void *)playing));
487 if(shutting_down || playing || !playing_is_enabled()) return;
488 /* If the queue is empty then add a random track. */
489 if(qhead.next == &qhead) {
490 if(!random_enabled)
491 return;
492 if(add_random_track()) {
493 /* On error, try again in 10s. */
494 retry_play(ev, 10);
495 return;
496 }
497 /* Now there must be at least one track in the queue. */
498 }
499 q = qhead.next;
500 /* If random play is disabled but the track is a random one then don't play
501 * it. play() will be called again when random play is re-enabled. */
502 if(!random_enabled && q->state == playing_random)
503 return;
504 D(("taken %p (%s) from queue", (void *)q, q->track));
505 /* Try to start playing. */
506 switch(start(ev, q, SM_PLAY)) {
507 case START_HARDFAIL:
508 if(q == qhead.next) {
509 queue_remove(q, 0); /* Abandon this track. */
510 queue_played(q);
511 recent_write();
512 }
513 if(qhead.next == &qhead)
514 /* Queue is empty, wait a bit before trying something else (so we don't
515 * sit there looping madly in the presence of persistent problem). Note
516 * that we might not reliably get a random track lookahead in this case,
517 * but if we get here then really there are bigger problems. */
518 retry_play(ev, 1);
519 else
520 /* More in queue, try again now. */
521 play(ev);
522 break;
523 case START_SOFTFAIL:
524 /* Try same track again in a bit. */
525 retry_play(ev, 10);
526 break;
527 case START_OK:
528 if(q == qhead.next) {
529 queue_remove(q, 0);
530 queue_write();
531 }
532 playing = q;
533 time(&playing->played);
534 playing->state = playing_started;
535 notify_play(playing->track, playing->submitter);
536 eventlog("playing", playing->track,
537 playing->submitter ? playing->submitter : (const char *)0,
538 (const char *)0);
539 /* Maybe add a random track. */
540 add_random_track();
541 /* If there is another track in the queue prepare it now. This could
542 * potentially be a just-added random track. */
543 if(qhead.next != &qhead)
544 prepare(ev, qhead.next);
545 break;
546 }
547}
548
549int playing_is_enabled(void) {
550 const char *s = trackdb_get_global("playing");
551
552 return !s || !strcmp(s, "yes");
553}
554
555void enable_playing(const char *who, ev_source *ev) {
556 trackdb_set_global("playing", "yes", who);
557 /* Add a random track if necessary. */
558 add_random_track();
559 play(ev);
560}
561
562void disable_playing(const char *who) {
563 trackdb_set_global("playing", "no", who);
564}
565
566int random_is_enabled(void) {
567 const char *s = trackdb_get_global("random-play");
568
569 return !s || !strcmp(s, "yes");
570}
571
572void enable_random(const char *who, ev_source *ev) {
573 trackdb_set_global("random-play", "yes", who);
574 add_random_track();
575 play(ev);
576}
577
578void disable_random(const char *who) {
579 trackdb_set_global("random-play", "no", who);
580}
581
582void scratch(const char *who, const char *id) {
583 struct queue_entry *q;
584 struct speaker_message sm;
585 pid_t pid;
586
587 D(("scratch playing=%p state=%d id=%s playing->id=%s",
588 (void *)playing,
589 playing ? playing->state : 0,
590 id ? id : "(none)",
591 playing ? playing->id : "(none)"));
592 if(playing
593 && (playing->state == playing_started
594 || playing->state == playing_paused)
595 && (!id
596 || !strcmp(id, playing->id))) {
597 playing->state = playing_scratched;
598 playing->scratched = who ? xstrdup(who) : 0;
599 if((pid = find_player_pid(playing->id)) > 0) {
600 D(("kill -%d %lu", config->signal, (unsigned long)pid));
601 kill(-pid, config->signal);
602 forget_player_pid(playing->id);
603 } else
604 error(0, "could not find PID for %s", playing->id);
605 if((playing->type & DISORDER_PLAYER_TYPEMASK) == DISORDER_PLAYER_RAW) {
606 memset(&sm, 0, sizeof sm);
607 sm.type = SM_CANCEL;
608 strcpy(sm.id, playing->id);
609 speaker_send(speaker_fd, &sm, -1);
610 D(("sending SM_CANCEL for %s", playing->id));
611 }
612 /* put a scratch track onto the front of the queue (but don't
613 * bother if playing is disabled) */
614 if(playing_is_enabled() && config->scratch.n) {
615 int r = rand() * (double)config->scratch.n / (RAND_MAX + 1.0);
616 q = queue_add(config->scratch.s[r], who, WHERE_START);
617 q->state = playing_isscratch;
618 }
619 notify_scratch(playing->track, playing->submitter, who,
620 time(0) - playing->played);
621 }
622}
623
624void quitting(ev_source *ev) {
625 struct queue_entry *q;
626 pid_t pid;
627
628 /* Don't start anything new */
629 shutting_down = 1;
630 /* Shut down the current player */
631 if(playing) {
632 if((pid = find_player_pid(playing->id)) > 0) {
633 kill(-pid, config->signal);
634 forget_player_pid(playing->id);
635 } else
636 error(0, "could not find PID for %s", playing->id);
637 playing->state = playing_quitting;
638 finished(0);
639 }
640 /* Zap any other players */
641 for(q = qhead.next; q != &qhead; q = q->next)
642 if((pid = find_player_pid(q->id)) > 0) {
643 D(("kill -%d %lu", config->signal, (unsigned long)pid));
644 kill(-pid, config->signal);
645 forget_player_pid(q->id);
646 } else
647 error(0, "could not find PID for %s", q->id);
648 /* Don't need the speaker any more */
649 ev_fd_cancel(ev, ev_read, speaker_fd);
650 xclose(speaker_fd);
651}
652
653int pause_playing(const char *who) {
654 struct speaker_message sm;
655 long played;
656
657 /* Can't pause if already paused or if nothing playing. */
658 if(!playing || paused) return 0;
659 switch(playing->type & DISORDER_PLAYER_TYPEMASK) {
660 case DISORDER_PLAYER_STANDALONE:
661 if(!(playing->type & DISORDER_PLAYER_PAUSES)) {
662 default:
663 error(0, "cannot pause because player is not powerful enough");
664 return -1;
665 }
666 if(play_pause(playing->pl, &played, playing->data)) {
667 error(0, "player indicates it cannot pause");
668 return -1;
669 }
670 time(&playing->lastpaused);
671 playing->uptopause = played;
672 playing->lastresumed = 0;
673 break;
674 case DISORDER_PLAYER_RAW:
675 memset(&sm, 0, sizeof sm);
676 sm.type = SM_PAUSE;
677 speaker_send(speaker_fd, &sm, -1);
678 break;
679 }
680 if(who) info("paused by %s", who);
681 notify_pause(playing->track, who);
682 paused = 1;
683 if(playing->state == playing_started)
684 playing->state = playing_paused;
685 eventlog("state", "pause", (char *)0);
686 return 0;
687}
688
689void resume_playing(const char *who) {
690 struct speaker_message sm;
691
692 if(!paused) return;
693 paused = 0;
694 if(!playing) return;
695 switch(playing->type & DISORDER_PLAYER_TYPEMASK) {
696 case DISORDER_PLAYER_STANDALONE:
697 if(!playing->type & DISORDER_PLAYER_PAUSES) {
698 default:
699 /* Shouldn't happen */
700 return;
701 }
702 play_resume(playing->pl, playing->data);
703 time(&playing->lastresumed);
704 break;
705 case DISORDER_PLAYER_RAW:
706 memset(&sm, 0, sizeof sm);
707 sm.type = SM_RESUME;
708 speaker_send(speaker_fd, &sm, -1);
709 break;
710 }
711 if(who) info("resumed by %s", who);
712 notify_resume(playing->track, who);
713 if(playing->state == playing_paused)
714 playing->state = playing_started;
715 eventlog("state", "resume", (char *)0);
716}
717
718/*
719Local Variables:
720c-basic-offset:2
721comment-column:40
722fill-column:79
723End:
724*/
725/* arch-tag:17f4e83cce4cbaa60a122475379e63f1 */