mdw@git.distorted.org.uk Git - disorder/blob - server/play.c

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2004, 2005, 2006, 2007 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 #include "types.h"
  23
  24 #include <sys/types.h>
  25 #include <sys/time.h>
  26 #include <unistd.h>
  27 #include <errno.h>
  28 #include <fnmatch.h>
  29 #include <time.h>
  30 #include <signal.h>
  31 #include <stdlib.h>
  32 #include <assert.h>
  33 #include <sys/socket.h>
  34 #include <string.h>
  35 #include <stdio.h>
  36 #include <pcre.h>
  37 #include <ao/ao.h>
  38 #include <sys/wait.h>
  39 #include <sys/un.h>
  40
  41 #include "event.h"
  42 #include "log.h"
  43 #include "mem.h"
  44 #include "configuration.h"
  45 #include "queue.h"
  46 #include "server-queue.h"
  47 #include "trackdb.h"
  48 #include "play.h"
  49 #include "plugin.h"
  50 #include "wstat.h"
  51 #include "eventlog.h"
  52 #include "logfd.h"
  53 #include "syscalls.h"
  54 #include "speaker-protocol.h"
  55 #include "disorder.h"
  56 #include "signame.h"
  57 #include "hash.h"
  58
  59 #define SPEAKER "disorder-speaker"
  60
  61 struct queue_entry *playing;
  62 int paused;
  63
  64 static void finished(ev_source *ev);
  65
  66 static int speaker_fd = -1;
  67 static hash *player_pids;
  68 static int shutting_down;
  69
  70 static void store_player_pid(const char *id, pid_t pid) {
  71   if(!player_pids) player_pids = hash_new(sizeof (pid_t));
  72   hash_add(player_pids, id, &pid, HASH_INSERT_OR_REPLACE);
  73 }
  74
  75 static pid_t find_player_pid(const char *id) {
  76   pid_t *pidp;
  77
  78   if(player_pids && (pidp = hash_find(player_pids, id))) return *pidp;
  79   return -1;
  80 }
  81
  82 static void forget_player_pid(const char *id) {
  83   if(player_pids) hash_remove(player_pids, id);
  84 }
  85
  86 /* called when speaker process terminates */
  87 static int speaker_terminated(ev_source attribute((unused)) *ev,
  88                               pid_t attribute((unused)) pid,
  89                               int attribute((unused)) status,
  90                               const struct rusage attribute((unused)) *rusage,
  91                               void attribute((unused)) *u) {
  92   fatal(0, "speaker subprocess %s",
  93         wstat(status));
  94 }
  95
  96 /* called when speaker process has something to say */
  97 static int speaker_readable(ev_source *ev, int fd,
  98                             void attribute((unused)) *u) {
  99   struct speaker_message sm;
 100   int ret = speaker_recv(fd, &sm);
 101
 102   if(ret < 0) return 0;                 /* EAGAIN */
 103   if(!ret) {                            /* EOF */
 104     ev_fd_cancel(ev, ev_read, fd);
 105     return 0;
 106   }
 107   switch(sm.type) {
 108   case SM_PAUSED:
 109     /* track ID is paused, DATA seconds played */
 110     D(("SM_PAUSED %s %ld", sm.id, sm.data));
 111     playing->sofar = sm.data;
 112     break;
 113   case SM_FINISHED:
 114     /* the playing track finished */
 115     D(("SM_FINISHED %s", sm.id));
 116     finished(ev);
 117     break;
 118   case SM_PLAYING:
 119     /* track ID is playing, DATA seconds played */
 120     D(("SM_PLAYING %s %ld", sm.id, sm.data));
 121     playing->sofar = sm.data;
 122     break;
 123   default:
 124     error(0, "unknown message type %d", sm.type);
 125   }
 126   return 0;
 127 }
 128
 129 void speaker_setup(ev_source *ev) {
 130   int sp[2], lfd;
 131   pid_t pid;
 132   struct speaker_message sm;
 133
 134   if(socketpair(PF_UNIX, SOCK_DGRAM, 0, sp) < 0)
 135     fatal(errno, "error calling socketpair");
 136   if(!isatty(2))
 137     lfd = logfd(ev, SPEAKER);
 138   else
 139     lfd = -1;
 140   if(!(pid = xfork())) {
 141     exitfn = _exit;
 142     ev_signal_atfork(ev);
 143     xdup2(sp[0], 0);
 144     xdup2(sp[0], 1);
 145     xclose(sp[0]);
 146     xclose(sp[1]);
 147     if(lfd != -1) {
 148       xdup2(lfd, 2);
 149       xclose(lfd);
 150     }
 151     signal(SIGPIPE, SIG_DFL);
 152 #if 0
 153     execlp("valgrind", "valgrind", SPEAKER, "--config", configfile,
 154            debugging ? "--debug" : "--no-debug",
 155            log_default == &log_syslog ? "--syslog" : "--no-syslog",
 156            (char *)0);
 157 #else
 158     execlp(SPEAKER, SPEAKER, "--config", configfile,
 159            debugging ? "--debug" : "--no-debug",
 160            log_default == &log_syslog ? "--syslog" : "--no-syslog",
 161            (char *)0);
 162 #endif
 163     fatal(errno, "error invoking %s", SPEAKER);
 164   }
 165   ev_child(ev, pid, 0, speaker_terminated, 0);
 166   speaker_fd = sp[1];
 167   xclose(sp[0]);
 168   cloexec(speaker_fd);
 169   /* Wait for the speaker to be ready */
 170   speaker_recv(speaker_fd, &sm);
 171   nonblock(speaker_fd);
 172   ev_fd(ev, ev_read, speaker_fd, speaker_readable, 0, "speaker read");
 173 }
 174
 175 void speaker_reload(void) {
 176   struct speaker_message sm;
 177
 178   memset(&sm, 0, sizeof sm);
 179   sm.type = SM_RELOAD;
 180   speaker_send(speaker_fd, &sm);
 181 }
 182
 183 /* timeout for play retry */
 184 static int play_again(ev_source *ev,
 185                       const struct timeval attribute((unused)) *now,
 186                       void attribute((unused)) *u) {
 187   D(("play_again"));
 188   play(ev);
 189   return 0;
 190 }
 191
 192 /* try calling play() again after @offset@ seconds */
 193 static void retry_play(ev_source *ev, int offset) {
 194   struct timeval w;
 195
 196   D(("retry_play(%d)", offset));
 197   gettimeofday(&w, 0);
 198   w.tv_sec += offset;
 199   ev_timeout(ev, 0, &w, play_again, 0);
 200 }
 201
 202 /* Called when the currently playing track finishes playing.  This
 203  * might be because the player finished or because the speaker process
 204  * told us so. */
 205 static void finished(ev_source *ev) {
 206   D(("finished playing=%p", (void *)playing));
 207   if(!playing)
 208     return;
 209   if(playing->state != playing_scratched)
 210     notify_not_scratched(playing->track, playing->submitter);
 211   switch(playing->state) {
 212   case playing_ok:
 213     eventlog("completed", playing->track, (char *)0);
 214     break;
 215   case playing_scratched:
 216     eventlog("scratched", playing->track, playing->scratched, (char *)0);
 217     break;
 218   case playing_failed:
 219     eventlog("failed", playing->track, wstat(playing->wstat), (char *)0);
 220     break;
 221   default:
 222     break;
 223   }
 224   queue_played(playing);
 225   recent_write();
 226   forget_player_pid(playing->id);
 227   playing = 0;
 228   if(ev) retry_play(ev, config->gap);
 229 }
 230
 231 /* Called when a player terminates. */
 232 static int player_finished(ev_source *ev,
 233                            pid_t pid,
 234                            int status,
 235                            const struct rusage attribute((unused)) *rusage,
 236                            void *u) {
 237   struct queue_entry *q = u;
 238
 239   D(("player_finished pid=%lu status=%#x",
 240      (unsigned long)pid, (unsigned)status));
 241   /* Record that this PID is dead.  If we killed the track we might know this
 242    * already, but also it might have exited or crashed.  Either way we don't
 243    * want to end up signalling it. */
 244   if(pid == find_player_pid(q->id))
 245     forget_player_pid(q->id);
 246   switch(q->state) {
 247   case playing_unplayed:
 248   case playing_random:
 249     /* If this was a pre-prepared track then either it failed or we
 250      * deliberately stopped it because it was removed from the queue or moved
 251      * down it.  So leave it state alone for future use. */
 252     break;
 253   default:
 254     /* We actually started playing this track. */
 255     if(status) {
 256       if(q->state != playing_scratched)
 257         q->state = playing_failed;
 258     } else
 259       q->state = playing_ok;
 260     break;
 261   }
 262   /* Regardless we always report and record the status and do cleanup for
 263    * prefork calls. */
 264   if(status)
 265     error(0, "player for %s %s", q->track, wstat(status));
 266   if(q->type & DISORDER_PLAYER_PREFORK)
 267     play_cleanup(q->pl, q->data);
 268   q->wstat = status;
 269   /* If this actually was the current track, and does not use the speaker
 270    * process, then it must have finished.  For raw-output players we will get a
 271    * separate notification from the speaker process. */
 272   if(q == playing
 273      && (q->type & DISORDER_PLAYER_TYPEMASK) != DISORDER_PLAYER_RAW)
 274     finished(ev);
 275   return 0;
 276 }
 277
 278 /* Find the player for Q */
 279 static int find_player(const struct queue_entry *q) {
 280   int n;
 281
 282   for(n = 0; n < config->player.n; ++n)
 283     if(fnmatch(config->player.s[n].s[0], q->track, 0) == 0)
 284       break;
 285   if(n >= config->player.n)
 286     return -1;
 287   else
 288     return n;
 289 }
 290
 291 /* Return values from start() */
 292 #define START_OK 0                      /**< @brief Succeeded. */
 293 #define START_HARDFAIL 1                /**< @brief Track is broken. */
 294 #define START_SOFTFAIL 2           /**< @brief Track OK, system (temporarily?) broken */
 295
 296 /** @brief Play or prepare @p q
 297  * @param ev Event loop
 298  * @param q Track to play/prepare
 299  * @param prepare_only If true, only prepares track
 300  * @return @ref START_OK, @ref START_HARDFAIL or @ref START_SOFTFAIL
 301  */
 302 static int start(ev_source *ev,
 303                  struct queue_entry *q,
 304                  int prepare_only) {
 305   int n, lfd;
 306   const char *p;
 307   int np[2], sfd;
 308   struct speaker_message sm;
 309   char buffer[64];
 310   int optc;
 311   ao_sample_format format;
 312   ao_device *device;
 313   int retries;
 314   struct timespec ts;
 315   const char *waitdevice = 0;
 316   const char *const *optv;
 317   pid_t pid, npid;
 318   struct sockaddr_un addr;
 319   uint32_t l;
 320
 321   memset(&sm, 0, sizeof sm);
 322   D(("start %s %d", q->id, prepare_only));
 323   if(find_player_pid(q->id) > 0) {
 324     if(prepare_only) return START_OK;
 325     /* We have already prepared this track so we just need to tell the speaker
 326      * process to start actually playing the queued up audio data */
 327     strcpy(sm.id, q->id);
 328     sm.type = SM_PLAY;
 329     speaker_send(speaker_fd, &sm);
 330     D(("sent SM_PLAY for %s", sm.id));
 331     return START_OK;
 332   }
 333   /* Find the player plugin. */
 334   if((n = find_player(q)) < 0) return START_HARDFAIL;
 335   if(!(q->pl = open_plugin(config->player.s[n].s[1], 0)))
 336     return START_HARDFAIL;
 337   q->type = play_get_type(q->pl);
 338   /* Can't prepare non-raw tracks. */
 339   if(prepare_only
 340      && (q->type & DISORDER_PLAYER_TYPEMASK) != DISORDER_PLAYER_RAW)
 341     return START_OK;
 342   /* Call the prefork function. */
 343   p = trackdb_rawpath(q->track);
 344   if(q->type & DISORDER_PLAYER_PREFORK)
 345     if(!(q->data = play_prefork(q->pl, p))) {
 346       error(0, "prefork function for %s failed", q->track);
 347       return START_HARDFAIL;
 348     }
 349   /* Use the second arg as the tag if available (it's probably a command name),
 350    * otherwise the module name. */
 351   if(!isatty(2))
 352     lfd = logfd(ev, (config->player.s[n].s[2]
 353                      ? config->player.s[n].s[2] : config->player.s[n].s[1]));
 354   else
 355     lfd = -1;
 356   optc = config->player.s[n].n - 2;
 357   optv = (void *)&config->player.s[n].s[2];
 358   while(optc > 0 && optv[0][0] == '-') {
 359     if(!strcmp(optv[0], "--")) {
 360       ++optv;
 361       --optc;
 362       break;
 363     }
 364     if(!strcmp(optv[0], "--wait-for-device")
 365        || !strncmp(optv[0], "--wait-for-device=", 18)) {
 366       if((waitdevice = strchr(optv[0], '='))) {
 367         ++waitdevice;
 368       } else
 369         waitdevice = "";                /* use default */
 370       ++optv;
 371       --optc;
 372     } else {
 373       error(0, "unknown option %s", optv[0]);
 374       return START_HARDFAIL;
 375     }
 376   }
 377   switch(pid = fork()) {
 378   case 0:                       /* child */
 379     exitfn = _exit;
 380     ev_signal_atfork(ev);
 381     signal(SIGPIPE, SIG_DFL);
 382     if(lfd != -1) {
 383       xdup2(lfd, 1);
 384       xdup2(lfd, 2);
 385       xclose(lfd);                      /* tidy up */
 386     }
 387     setpgid(0, 0);
 388     if((q->type & DISORDER_PLAYER_TYPEMASK) == DISORDER_PLAYER_RAW) {
 389       /* "Raw" format players always have their output send down a pipe
 390        * to the disorder-normalize process.  This will connect to the
 391        * speaker process to actually play the audio data.
 392        */
 393       /* np will be the pipe to disorder-normalize */
 394       if(socketpair(PF_UNIX, SOCK_STREAM, 0, np) < 0)
 395         fatal(errno, "error calling socketpair");
 396       xshutdown(np[0], SHUT_WR);        /* normalize reads from np[0] */
 397       xshutdown(np[1], SHUT_RD);        /* decoder writes to np[1] */
 398       blocking(np[0]);
 399       blocking(np[1]);
 400       /* Start disorder-normalize */
 401       if(!(npid = xfork())) {
 402         if(!xfork()) {
 403           /* Connect to the speaker process */
 404           memset(&addr, 0, sizeof addr);
 405           addr.sun_family = AF_UNIX;
 406           snprintf(addr.sun_path, sizeof addr.sun_path,
 407                    "%s/speaker", config->home);
 408           sfd = xsocket(PF_UNIX, SOCK_STREAM, 0);
 409           if(connect(sfd, (const struct sockaddr *)&addr, sizeof addr) < 0)
 410             fatal(errno, "connecting to %s", addr.sun_path);
 411           l = strlen(q->id);
 412           if(write(sfd, &l, sizeof l) < 0
 413              || write(sfd, q->id, l) < 0)
 414             fatal(errno, "writing to %s", addr.sun_path);
 415           /* Await the ack */
 416           read(sfd, &l, 1);
 417           /* Plumbing */
 418           xdup2(np[0], 0);
 419           xdup2(sfd, 1);
 420           xclose(np[0]);
 421           xclose(np[1]);
 422           xclose(sfd);
 423           /* Ask the speaker to actually start playing the track; we do it here
 424            * so it's definitely after ack. */
 425           if(!prepare_only) {
 426             strcpy(sm.id, q->id);
 427             sm.type = SM_PLAY;
 428             speaker_send(speaker_fd, &sm);
 429             D(("sent SM_PLAY for %s", sm.id));
 430           }
 431           execlp("disorder-normalize", "disorder-normalize",
 432                  log_default == &log_syslog ? "--syslog" : "--no-syslog",
 433                  (char *)0);
 434           fatal(errno, "executing disorder-normalize");
 435           /* end of the innermost fork */
 436         }
 437         _exit(0);
 438         /* end of the middle fork */
 439       }
 440       /* Wait for the middle fork to finish */
 441       while(waitpid(npid, &n, 0) < 0 && errno == EINTR)
 442         ;
 443       /* Pass the file descriptor to the driver in an environment
 444        * variable. */
 445       snprintf(buffer, sizeof buffer, "DISORDER_RAW_FD=%d", np[1]);
 446       if(putenv(buffer) < 0)
 447         fatal(errno, "error calling putenv");
 448       /* Close all the FDs we don't need */
 449       xclose(np[0]);
 450     }
 451     if(waitdevice) {
 452       ao_initialize();
 453       if(*waitdevice) {
 454         n = ao_driver_id(waitdevice);
 455         if(n == -1)
 456           fatal(0, "invalid libao driver: %s", optv[0]);
 457         } else
 458           n = ao_default_driver_id();
 459       /* Make up a format. */
 460       memset(&format, 0, sizeof format);
 461       format.bits = 8;
 462       format.rate = 44100;
 463       format.channels = 1;
 464       format.byte_format = AO_FMT_NATIVE;
 465       retries = 20;
 466       ts.tv_sec = 0;
 467       ts.tv_nsec = 100000000;   /* 0.1s */
 468       while((device = ao_open_live(n, &format, 0)) == 0 && retries-- > 0)
 469           nanosleep(&ts, 0);
 470       if(device)
 471         ao_close(device);
 472     }
 473     play_track(q->pl,
 474                optv, optc,
 475                p,
 476                q->track);
 477     _exit(0);
 478   case -1:                      /* error */
 479     error(errno, "error calling fork");
 480     if(q->type & DISORDER_PLAYER_PREFORK)
 481       play_cleanup(q->pl, q->data);     /* else would leak */
 482     if(lfd != -1)
 483       xclose(lfd);
 484     return START_SOFTFAIL;
 485   }
 486   store_player_pid(q->id, pid);
 487   if(lfd != -1)
 488     xclose(lfd);
 489   setpgid(pid, pid);
 490   ev_child(ev, pid, 0, player_finished, q);
 491   D(("player subprocess ID %lu", (unsigned long)pid));
 492   return START_OK;
 493 }
 494
 495 int prepare(ev_source *ev,
 496             struct queue_entry *q) {
 497   int n;
 498
 499   /* Find the player plugin */
 500   if(find_player_pid(q->id) > 0) return 0; /* Already going. */
 501   if((n = find_player(q)) < 0) return -1; /* No player */
 502   q->pl = open_plugin(config->player.s[n].s[1], 0); /* No player */
 503   q->type = play_get_type(q->pl);
 504   if((q->type & DISORDER_PLAYER_TYPEMASK) != DISORDER_PLAYER_RAW)
 505     return 0;                           /* Not a raw player */
 506   return start(ev, q, 1/*prepare_only*/); /* Prepare it */
 507 }
 508
 509 void abandon(ev_source attribute((unused)) *ev,
 510              struct queue_entry *q) {
 511   struct speaker_message sm;
 512   pid_t pid = find_player_pid(q->id);
 513
 514   if(pid < 0) return;                   /* Not prepared. */
 515   if((q->type & DISORDER_PLAYER_TYPEMASK) != DISORDER_PLAYER_RAW)
 516     return;                             /* Not a raw player. */
 517   /* Terminate the player. */
 518   kill(-pid, config->signal);
 519   forget_player_pid(q->id);
 520   /* Cancel the track. */
 521   memset(&sm, 0, sizeof sm);
 522   sm.type = SM_CANCEL;
 523   strcpy(sm.id, q->id);
 524   speaker_send(speaker_fd, &sm);
 525 }
 526
 527 int add_random_track(void) {
 528   struct queue_entry *q;
 529   const char *p;
 530   long qlen = 0;
 531   int rc = 0;
 532
 533   /* If random play is not enabled then do nothing. */
 534   if(shutting_down || !random_is_enabled())
 535     return 0;
 536   /* Count how big the queue is */
 537   for(q = qhead.next; q != &qhead; q = q->next)
 538     ++qlen;
 539   /* Add random tracks until the queue is at the right size */
 540   while(qlen < config->queue_pad) {
 541     /* Try to pick a random track */
 542     if(!(p = trackdb_random(16))) {
 543       rc = -1;
 544       break;
 545     }
 546     /* Add it to the end of the queue. */
 547     q = queue_add(p, 0, WHERE_END);
 548     q->state = playing_random;
 549     D(("picked %p (%s) at random", (void *)q, q->track));
 550     ++qlen;
 551   }
 552   /* Commit the queue */
 553   queue_write();
 554   return rc;
 555 }
 556
 557 /* try to play a track */
 558 void play(ev_source *ev) {
 559   struct queue_entry *q;
 560   int random_enabled = random_is_enabled();
 561
 562   D(("play playing=%p", (void *)playing));
 563   if(shutting_down || playing || !playing_is_enabled()) return;
 564   /* If the queue is empty then add a random track. */
 565   if(qhead.next == &qhead) {
 566     if(!random_enabled)
 567       return;
 568     if(add_random_track()) {
 569       /* On error, try again in 10s. */
 570       retry_play(ev, 10);
 571       return;
 572     }
 573     /* Now there must be at least one track in the queue. */
 574   }
 575   q = qhead.next;
 576   /* If random play is disabled but the track is a random one then don't play
 577    * it.  play() will be called again when random play is re-enabled. */
 578   if(!random_enabled && q->state == playing_random)
 579     return;
 580   D(("taken %p (%s) from queue", (void *)q, q->track));
 581   /* Try to start playing. */
 582   switch(start(ev, q, 0/*!prepare_only*/)) {
 583   case START_HARDFAIL:
 584     if(q == qhead.next) {
 585       queue_remove(q, 0);               /* Abandon this track. */
 586       queue_played(q);
 587       recent_write();
 588     }
 589     if(qhead.next == &qhead)
 590       /* Queue is empty, wait a bit before trying something else (so we don't
 591        * sit there looping madly in the presence of persistent problem).  Note
 592        * that we might not reliably get a random track lookahead in this case,
 593        * but if we get here then really there are bigger problems. */
 594       retry_play(ev, 1);
 595     else
 596       /* More in queue, try again now. */
 597       play(ev);
 598     break;
 599   case START_SOFTFAIL:
 600     /* Try same track again in a bit. */
 601     retry_play(ev, 10);
 602     break;
 603   case START_OK:
 604     if(q == qhead.next) {
 605       queue_remove(q, 0);
 606       queue_write();
 607     }
 608     playing = q;
 609     time(&playing->played);
 610     playing->state = playing_started;
 611     notify_play(playing->track, playing->submitter);
 612     eventlog("playing", playing->track,
 613              playing->submitter ? playing->submitter : (const char *)0,
 614              (const char *)0);
 615     /* Maybe add a random track. */
 616     add_random_track();
 617     /* If there is another track in the queue prepare it now.  This could
 618      * potentially be a just-added random track. */
 619     if(qhead.next != &qhead)
 620       prepare(ev, qhead.next);
 621     break;
 622   }
 623 }
 624
 625 int playing_is_enabled(void) {
 626   const char *s = trackdb_get_global("playing");
 627
 628   return !s || !strcmp(s, "yes");
 629 }
 630
 631 void enable_playing(const char *who, ev_source *ev) {
 632   trackdb_set_global("playing", "yes", who);
 633   /* Add a random track if necessary. */
 634   add_random_track();
 635   play(ev);
 636 }
 637
 638 void disable_playing(const char *who) {
 639   trackdb_set_global("playing", "no", who);
 640 }
 641
 642 int random_is_enabled(void) {
 643   const char *s = trackdb_get_global("random-play");
 644
 645   return !s || !strcmp(s, "yes");
 646 }
 647
 648 void enable_random(const char *who, ev_source *ev) {
 649   trackdb_set_global("random-play", "yes", who);
 650   add_random_track();
 651   play(ev);
 652 }
 653
 654 void disable_random(const char *who) {
 655   trackdb_set_global("random-play", "no", who);
 656 }
 657
 658 void scratch(const char *who, const char *id) {
 659   struct queue_entry *q;
 660   struct speaker_message sm;
 661   pid_t pid;
 662
 663   D(("scratch playing=%p state=%d id=%s playing->id=%s",
 664      (void *)playing,
 665      playing ? playing->state : 0,
 666      id ? id : "(none)",
 667      playing ? playing->id : "(none)"));
 668   if(playing
 669      && (playing->state == playing_started
 670          || playing->state == playing_paused)
 671      && (!id
 672          || !strcmp(id, playing->id))) {
 673     playing->state = playing_scratched;
 674     playing->scratched = who ? xstrdup(who) : 0;
 675     if((pid = find_player_pid(playing->id)) > 0) {
 676       D(("kill -%d %lu", config->signal, (unsigned long)pid));
 677       kill(-pid, config->signal);
 678       forget_player_pid(playing->id);
 679     } else
 680       error(0, "could not find PID for %s", playing->id);
 681     if((playing->type & DISORDER_PLAYER_TYPEMASK) == DISORDER_PLAYER_RAW) {
 682       memset(&sm, 0, sizeof sm);
 683       sm.type = SM_CANCEL;
 684       strcpy(sm.id, playing->id);
 685       speaker_send(speaker_fd, &sm);
 686       D(("sending SM_CANCEL for %s", playing->id));
 687     }
 688     /* put a scratch track onto the front of the queue (but don't
 689      * bother if playing is disabled) */
 690     if(playing_is_enabled() && config->scratch.n) {
 691       int r = rand() * (double)config->scratch.n / (RAND_MAX + 1.0);
 692       q = queue_add(config->scratch.s[r], who, WHERE_START);
 693       q->state = playing_isscratch;
 694     }
 695     notify_scratch(playing->track, playing->submitter, who,
 696                    time(0) - playing->played);
 697   }
 698 }
 699
 700 void quitting(ev_source *ev) {
 701   struct queue_entry *q;
 702   pid_t pid;
 703
 704   /* Don't start anything new */
 705   shutting_down = 1;
 706   /* Shut down the current player */
 707   if(playing) {
 708     if((pid = find_player_pid(playing->id)) > 0) {
 709       kill(-pid, config->signal);
 710       forget_player_pid(playing->id);
 711     } else
 712       error(0, "could not find PID for %s", playing->id);
 713     playing->state = playing_quitting;
 714     finished(0);
 715   }
 716   /* Zap any other players */
 717   for(q = qhead.next; q != &qhead; q = q->next)
 718     if((pid = find_player_pid(q->id)) > 0) {
 719       D(("kill -%d %lu", config->signal, (unsigned long)pid));
 720       kill(-pid, config->signal);
 721       forget_player_pid(q->id);
 722     } else
 723       error(0, "could not find PID for %s", q->id);
 724   /* Don't need the speaker any more */
 725   ev_fd_cancel(ev, ev_read, speaker_fd);
 726   xclose(speaker_fd);
 727 }
 728
 729 int pause_playing(const char *who) {
 730   struct speaker_message sm;
 731   long played;
 732
 733   /* Can't pause if already paused or if nothing playing. */
 734   if(!playing || paused) return 0;
 735   switch(playing->type & DISORDER_PLAYER_TYPEMASK) {
 736   case DISORDER_PLAYER_STANDALONE:
 737     if(!(playing->type & DISORDER_PLAYER_PAUSES)) {
 738     default:
 739       error(0,  "cannot pause because player is not powerful enough");
 740       return -1;
 741     }
 742     if(play_pause(playing->pl, &played, playing->data)) {
 743       error(0, "player indicates it cannot pause");
 744       return -1;
 745     }
 746     time(&playing->lastpaused);
 747     playing->uptopause = played;
 748     playing->lastresumed = 0;
 749     break;
 750   case DISORDER_PLAYER_RAW:
 751     memset(&sm, 0, sizeof sm);
 752     sm.type = SM_PAUSE;
 753     speaker_send(speaker_fd, &sm);
 754     break;
 755   }
 756   if(who) info("paused by %s", who);
 757   notify_pause(playing->track, who);
 758   paused = 1;
 759   if(playing->state == playing_started)
 760     playing->state = playing_paused;
 761   eventlog("state", "pause", (char *)0);
 762   return 0;
 763 }
 764
 765 void resume_playing(const char *who) {
 766   struct speaker_message sm;
 767
 768   if(!paused) return;
 769   paused = 0;
 770   if(!playing) return;
 771   switch(playing->type & DISORDER_PLAYER_TYPEMASK) {
 772   case DISORDER_PLAYER_STANDALONE:
 773     if(!playing->type & DISORDER_PLAYER_PAUSES) {
 774     default:
 775       /* Shouldn't happen */
 776       return;
 777     }
 778     play_resume(playing->pl, playing->data);
 779     time(&playing->lastresumed);
 780     break;
 781   case DISORDER_PLAYER_RAW:
 782     memset(&sm, 0, sizeof sm);
 783     sm.type = SM_RESUME;
 784     speaker_send(speaker_fd, &sm);
 785     break;
 786   }
 787   if(who) info("resumed by %s", who);
 788   notify_resume(playing->track, who);
 789   if(playing->state == playing_paused)
 790     playing->state = playing_started;
 791   eventlog("state", "resume", (char *)0);
 792 }
 793
 794 /*
 795 Local Variables:
 796 c-basic-offset:2
 797 comment-column:40
 798 fill-column:79
 799 End:
 800 */