/*
* This file is part of DisOrder.
- * Copyright (C) 2004, 2005, 2006, 2007 Richard Kettlewell
+ * Copyright (C) 2004-2009 Richard Kettlewell
*
- * This program is free software; you can redistribute it and/or modify
+ * This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
+ * the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
* You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- * USA
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+/** @file server/play.c
+ * @brief Playing tracks
+ *
+ * This file is rather badly organized. Sorry. It's better than it was...
*/
-#include <config.h>
-#include "types.h"
-
-#include <sys/types.h>
-#include <sys/time.h>
-#include <unistd.h>
-#include <errno.h>
-#include <fnmatch.h>
-#include <time.h>
-#include <signal.h>
-#include <stdlib.h>
-#include <assert.h>
-#include <sys/socket.h>
-#include <string.h>
-#include <stdio.h>
-#include <pcre.h>
+#include "disorder-server.h"
#include <ao/ao.h>
-#include <sys/wait.h>
-#include <sys/un.h>
-
-#include "event.h"
-#include "log.h"
-#include "mem.h"
-#include "configuration.h"
-#include "queue.h"
-#include "server-queue.h"
-#include "trackdb.h"
-#include "play.h"
-#include "plugin.h"
-#include "wstat.h"
-#include "eventlog.h"
-#include "logfd.h"
-#include "syscalls.h"
-#include "speaker-protocol.h"
-#include "disorder.h"
-#include "signame.h"
-#include "hash.h"
#define SPEAKER "disorder-speaker"
+/** @brief The current playing track or NULL */
struct queue_entry *playing;
+
+/** @brief Set when paused */
int paused;
static void finished(ev_source *ev);
-
+static int start_child(struct queue_entry *q,
+ const struct pbgc_params *params,
+ void attribute((unused)) *bgdata);
+static int prepare_child(struct queue_entry *q,
+ const struct pbgc_params *params,
+ void attribute((unused)) *bgdata);
+
+/** @brief File descriptor of our end of the socket to the speaker */
static int speaker_fd = -1;
-static hash *player_pids;
-static int shutting_down;
-
-static void store_player_pid(const char *id, pid_t pid) {
- if(!player_pids) player_pids = hash_new(sizeof (pid_t));
- hash_add(player_pids, id, &pid, HASH_INSERT_OR_REPLACE);
-}
-static pid_t find_player_pid(const char *id) {
- pid_t *pidp;
-
- if(player_pids && (pidp = hash_find(player_pids, id))) return *pidp;
- return -1;
-}
+/** @brief Set when shutting down */
+static int shutting_down;
-static void forget_player_pid(const char *id) {
- if(player_pids) hash_remove(player_pids, id);
-}
+/* Speaker ------------------------------------------------------------------ */
-/* called when speaker process terminates */
+/** @brief Called when speaker process terminates
+ *
+ * Currently kills of DisOrder completely. A future version could terminate
+ * the speaker when nothing was going on, or recover from failures, though any
+ * tracks with decoders already started would need to have them restarted.
+ */
static int speaker_terminated(ev_source attribute((unused)) *ev,
pid_t attribute((unused)) pid,
int attribute((unused)) status,
wstat(status));
}
-/* called when speaker process has something to say */
+/** @brief Called when we get a message from the speaker process */
static int speaker_readable(ev_source *ev, int fd,
void attribute((unused)) *u) {
struct speaker_message sm;
D(("SM_PAUSED %s %ld", sm.id, sm.data));
playing->sofar = sm.data;
break;
- case SM_FINISHED:
- /* the playing track finished */
- D(("SM_FINISHED %s", sm.id));
- finished(ev);
+ case SM_FINISHED: /* scratched the playing track */
+ case SM_STILLBORN: /* scratched too early */
+ case SM_UNKNOWN: /* scratched WAY too early */
+ if(playing && !strcmp(sm.id, playing->id))
+ finished(ev);
break;
case SM_PLAYING:
/* track ID is playing, DATA seconds played */
playing->sofar = sm.data;
break;
default:
- error(0, "unknown message type %d", sm.type);
+ error(0, "unknown speaker message type %d", sm.type);
}
return 0;
}
+/** @brief Initialize the speaker process */
void speaker_setup(ev_source *ev) {
- int sp[2], lfd;
+ int sp[2];
pid_t pid;
struct speaker_message sm;
if(socketpair(PF_UNIX, SOCK_DGRAM, 0, sp) < 0)
fatal(errno, "error calling socketpair");
- if(!isatty(2))
- lfd = logfd(ev, SPEAKER);
- else
- lfd = -1;
if(!(pid = xfork())) {
exitfn = _exit;
ev_signal_atfork(ev);
xdup2(sp[0], 1);
xclose(sp[0]);
xclose(sp[1]);
- if(lfd != -1) {
- xdup2(lfd, 2);
- xclose(lfd);
- }
signal(SIGPIPE, SIG_DFL);
#if 0
execlp("valgrind", "valgrind", SPEAKER, "--config", configfile,
/* Wait for the speaker to be ready */
speaker_recv(speaker_fd, &sm);
nonblock(speaker_fd);
- ev_fd(ev, ev_read, speaker_fd, speaker_readable, 0, "speaker read");
+ if(ev_fd(ev, ev_read, speaker_fd, speaker_readable, 0, "speaker read") < 0)
+ fatal(0, "error registering speaker socket fd");
}
+/** @brief Tell the speaker to reload its configuration */
void speaker_reload(void) {
struct speaker_message sm;
speaker_send(speaker_fd, &sm);
}
-/* timeout for play retry */
-static int play_again(ev_source *ev,
- const struct timeval attribute((unused)) *now,
- void attribute((unused)) *u) {
- D(("play_again"));
- play(ev);
- return 0;
-}
-
-/* try calling play() again after @offset@ seconds */
-static void retry_play(ev_source *ev, int offset) {
- struct timeval w;
-
- D(("retry_play(%d)", offset));
- gettimeofday(&w, 0);
- w.tv_sec += offset;
- ev_timeout(ev, 0, &w, play_again, 0);
-}
+/* Track termination -------------------------------------------------------- */
-/* Called when the currently playing track finishes playing. This
- * might be because the player finished or because the speaker process
- * told us so. */
+/** @brief Called when the currently playing track finishes playing
+ * @param ev Event loop or NULL
+ *
+ * There are three places this is called from:
+ *
+ * 1) speaker_readable(), when the speaker tells us the playing track finished.
+ * (Technically the speaker lies a little to arrange for gapless play.)
+ *
+ * 2) player_finished(), when the player for a non-raw track (i.e. one that
+ * does not use the speaker) finishes.
+ *
+ * 3) quitting(), after signalling the decoder or player but possible before it
+ * has actually terminated. In this case @p ev is NULL, inhibiting any further
+ * attempt to play anything.
+ */
static void finished(ev_source *ev) {
D(("finished playing=%p", (void *)playing));
if(!playing)
}
queue_played(playing);
recent_write();
- forget_player_pid(playing->id);
playing = 0;
- if(ev) retry_play(ev, config->gap);
+ /* Try to play something else */
+ if(ev)
+ play(ev);
}
-/* Called when a player terminates. */
+/** @brief Called when a player or decoder process terminates
+ *
+ * This is called when a decoder process terminates (which might actually be
+ * some time before the speaker reports it as finished) or when a non-raw
+ * (i.e. non-speaker) player terminates. In the latter case it's imaginable
+ * that the OS has buffered the last few samples.
+ *
+ */
static int player_finished(ev_source *ev,
pid_t pid,
int status,
/* Record that this PID is dead. If we killed the track we might know this
* already, but also it might have exited or crashed. Either way we don't
* want to end up signalling it. */
- if(pid == find_player_pid(q->id))
- forget_player_pid(q->id);
+ q->pid = -1;
switch(q->state) {
case playing_unplayed:
case playing_random:
/* If this was a pre-prepared track then either it failed or we
- * deliberately stopped it because it was removed from the queue or moved
- * down it. So leave it state alone for future use. */
+ * deliberately stopped it: it might have been removed from the queue, or
+ * moved down the queue, or the speaker might be on a break. So we leave
+ * it state alone for future use.
+ */
break;
default:
/* We actually started playing this track. */
if(status) {
+ /* Don't override 'scratched' with 'failed'. */
if(q->state != playing_scratched)
q->state = playing_failed;
} else
return 0;
}
-/* Find the player for Q */
-static int find_player(const struct queue_entry *q) {
+/* Track initiation --------------------------------------------------------- */
+
+/** @brief Find the player for @p q */
+static const struct stringlist *find_player(const struct queue_entry *q) {
int n;
for(n = 0; n < config->player.n; ++n)
if(fnmatch(config->player.s[n].s[0], q->track, 0) == 0)
break;
if(n >= config->player.n)
- return -1;
+ return NULL;
else
- return n;
+ return &config->player.s[n];
}
-/* Return values from start() */
-#define START_OK 0 /**< @brief Succeeded. */
-#define START_HARDFAIL 1 /**< @brief Track is broken. */
-#define START_SOFTFAIL 2 /**< @brief Track OK, system (temporarily?) broken */
-
-/** @brief Play or prepare @p q
+/** @brief Start to play @p q
* @param ev Event loop
* @param q Track to play/prepare
- * @param prepare_only If true, only prepares track
* @return @ref START_OK, @ref START_HARDFAIL or @ref START_SOFTFAIL
+ *
+ * This makes @p actually start playing. It calls prepare() if necessary and
+ * either sends an @ref SM_START command or invokes the player itself in a
+ * subprocess.
+ *
+ * It's up to the caller to set @ref playing and @c playing->state (this might
+ * be changed in the future).
*/
static int start(ev_source *ev,
- struct queue_entry *q,
- int prepare_only) {
- int n, lfd;
- const char *p;
- int np[2], sfd;
- struct speaker_message sm;
- char buffer[64];
- int optc;
- ao_sample_format format;
- ao_device *device;
- int retries;
- struct timespec ts;
- const char *waitdevice = 0;
- const char *const *optv;
- pid_t pid, npid;
- struct sockaddr_un addr;
- uint32_t l;
+ struct queue_entry *q) {
+ const struct stringlist *player;
+ int rc;
- memset(&sm, 0, sizeof sm);
- D(("start %s %d", q->id, prepare_only));
- if(find_player_pid(q->id) > 0) {
- if(prepare_only) return START_OK;
- /* We have already prepared this track so we just need to tell the speaker
- * process to start actually playing the queued up audio data */
- strcpy(sm.id, q->id);
- sm.type = SM_PLAY;
- speaker_send(speaker_fd, &sm);
- D(("sent SM_PLAY for %s", sm.id));
- return START_OK;
- }
+ D(("start %s", q->id));
/* Find the player plugin. */
- if((n = find_player(q)) < 0) return START_HARDFAIL;
- if(!(q->pl = open_plugin(config->player.s[n].s[1], 0)))
+ if(!(player = find_player(q)) < 0)
+ return START_HARDFAIL; /* No player */
+ if(!(q->pl = open_plugin(player->s[1], 0)))
return START_HARDFAIL;
q->type = play_get_type(q->pl);
- /* Can't prepare non-raw tracks. */
- if(prepare_only
- && (q->type & DISORDER_PLAYER_TYPEMASK) != DISORDER_PLAYER_RAW)
+ /* Special handling for raw-format players */
+ if((q->type & DISORDER_PLAYER_TYPEMASK) == DISORDER_PLAYER_RAW) {
+ /* Make sure that the track is prepared */
+ if((rc = prepare(ev, q)))
+ return rc;
+ /* Now we're sure it's prepared, start it playing */
+ /* TODO actually it might not be fully prepared yet - it's all happening in
+ * a subprocess. See speaker.c for further discussion. */
+ struct speaker_message sm[1];
+ memset(sm, 0, sizeof sm);
+ strcpy(sm->id, q->id);
+ sm->type = SM_PLAY;
+ speaker_send(speaker_fd, sm);
+ D(("sent SM_PLAY for %s", sm->id));
+ /* Our caller will set playing and playing->state = playing_started */
return START_OK;
- /* Call the prefork function. */
- p = trackdb_rawpath(q->track);
- if(q->type & DISORDER_PLAYER_PREFORK)
- if(!(q->data = play_prefork(q->pl, p))) {
- error(0, "prefork function for %s failed", q->track);
- return START_HARDFAIL;
- }
- /* Use the second arg as the tag if available (it's probably a command name),
- * otherwise the module name. */
- if(!isatty(2))
- lfd = logfd(ev, (config->player.s[n].s[2]
- ? config->player.s[n].s[2] : config->player.s[n].s[1]));
- else
- lfd = -1;
- optc = config->player.s[n].n - 2;
- optv = (void *)&config->player.s[n].s[2];
- while(optc > 0 && optv[0][0] == '-') {
- if(!strcmp(optv[0], "--")) {
- ++optv;
- --optc;
- break;
- }
- if(!strcmp(optv[0], "--wait-for-device")
- || !strncmp(optv[0], "--wait-for-device=", 18)) {
- if((waitdevice = strchr(optv[0], '='))) {
- ++waitdevice;
- } else
- waitdevice = ""; /* use default */
- ++optv;
- --optc;
- } else {
- error(0, "unknown option %s", optv[0]);
- return START_HARDFAIL;
- }
+ } else {
+ rc = play_background(ev, player, q, start_child, NULL);
+ if(rc == START_OK)
+ ev_child(ev, q->pid, 0, player_finished, q);
+ /* Our caller will set playing and playing->state = playing_started */
+ return rc;
}
- switch(pid = fork()) {
- case 0: /* child */
- exitfn = _exit;
- ev_signal_atfork(ev);
- signal(SIGPIPE, SIG_DFL);
- if(lfd != -1) {
- xdup2(lfd, 1);
- xdup2(lfd, 2);
- xclose(lfd); /* tidy up */
- }
- setpgid(0, 0);
- if((q->type & DISORDER_PLAYER_TYPEMASK) == DISORDER_PLAYER_RAW) {
- /* "Raw" format players always have their output send down a pipe
- * to the disorder-normalize process. This will connect to the
- * speaker process to actually play the audio data.
- */
- /* np will be the pipe to disorder-normalize */
- if(socketpair(PF_UNIX, SOCK_STREAM, 0, np) < 0)
- fatal(errno, "error calling socketpair");
- xshutdown(np[0], SHUT_WR); /* normalize reads from np[0] */
- xshutdown(np[1], SHUT_RD); /* decoder writes to np[1] */
- blocking(np[0]);
- blocking(np[1]);
- /* Start disorder-normalize */
- if(!(npid = xfork())) {
- if(!xfork()) {
- /* Connect to the speaker process */
- memset(&addr, 0, sizeof addr);
- addr.sun_family = AF_UNIX;
- snprintf(addr.sun_path, sizeof addr.sun_path,
- "%s/speaker", config->home);
- sfd = xsocket(PF_UNIX, SOCK_STREAM, 0);
- if(connect(sfd, (const struct sockaddr *)&addr, sizeof addr) < 0)
- fatal(errno, "connecting to %s", addr.sun_path);
- l = strlen(q->id);
- if(write(sfd, &l, sizeof l) < 0
- || write(sfd, q->id, l) < 0)
- fatal(errno, "writing to %s", addr.sun_path);
- /* Await the ack */
- read(sfd, &l, 1);
- /* Plumbing */
- xdup2(np[0], 0);
- xdup2(sfd, 1);
- xclose(np[0]);
- xclose(np[1]);
- xclose(sfd);
- /* Ask the speaker to actually start playing the track; we do it here
- * so it's definitely after ack. */
- if(!prepare_only) {
- strcpy(sm.id, q->id);
- sm.type = SM_PLAY;
- speaker_send(speaker_fd, &sm);
- D(("sent SM_PLAY for %s", sm.id));
- }
- execlp("disorder-normalize", "disorder-normalize", (char *)0);
- fatal(errno, "executing disorder-normalize");
- /* end of the innermost fork */
- }
- _exit(0);
- /* end of the middle fork */
- }
- /* Wait for the middle fork to finish */
- while(waitpid(npid, &n, 0) < 0 && errno == EINTR)
- ;
- /* Pass the file descriptor to the driver in an environment
- * variable. */
- snprintf(buffer, sizeof buffer, "DISORDER_RAW_FD=%d", np[1]);
- if(putenv(buffer) < 0)
- fatal(errno, "error calling putenv");
- /* Close all the FDs we don't need */
- xclose(np[0]);
- }
- if(waitdevice) {
- ao_initialize();
- if(*waitdevice) {
- n = ao_driver_id(waitdevice);
- if(n == -1)
- fatal(0, "invalid libao driver: %s", optv[0]);
- } else
- n = ao_default_driver_id();
- /* Make up a format. */
- memset(&format, 0, sizeof format);
- format.bits = 8;
- format.rate = 44100;
- format.channels = 1;
- format.byte_format = AO_FMT_NATIVE;
- retries = 20;
- ts.tv_sec = 0;
- ts.tv_nsec = 100000000; /* 0.1s */
- while((device = ao_open_live(n, &format, 0)) == 0 && retries-- > 0)
- nanosleep(&ts, 0);
- if(device)
- ao_close(device);
- }
- play_track(q->pl,
- optv, optc,
- p,
- q->track);
- _exit(0);
- case -1: /* error */
- error(errno, "error calling fork");
- if(q->type & DISORDER_PLAYER_PREFORK)
- play_cleanup(q->pl, q->data); /* else would leak */
- if(lfd != -1)
- xclose(lfd);
- return START_SOFTFAIL;
+}
+
+/** @brief Child-process half of start() */
+static int start_child(struct queue_entry *q,
+ const struct pbgc_params *params,
+ void attribute((unused)) *bgdata) {
+ int n;
+
+ /* Wait for a device to clear. This ugliness is now deprecated and will
+ * eventually be removed. */
+ if(params->waitdevice) {
+ ao_initialize();
+ if(*params->waitdevice) {
+ n = ao_driver_id(params->waitdevice);
+ if(n == -1)
+ fatal(0, "invalid libao driver: %s", params->waitdevice);
+ } else
+ n = ao_default_driver_id();
+ /* Make up a format. */
+ ao_sample_format format;
+ memset(&format, 0, sizeof format);
+ format.bits = 8;
+ format.rate = 44100;
+ format.channels = 1;
+ format.byte_format = AO_FMT_NATIVE;
+ int retries = 20;
+ struct timespec ts;
+ ts.tv_sec = 0;
+ ts.tv_nsec = 100000000; /* 0.1s */
+ ao_device *device;
+ while((device = ao_open_live(n, &format, 0)) == 0 && retries-- > 0)
+ nanosleep(&ts, 0);
+ if(device)
+ ao_close(device);
}
- store_player_pid(q->id, pid);
- if(lfd != -1)
- xclose(lfd);
- setpgid(pid, pid);
- ev_child(ev, pid, 0, player_finished, q);
- D(("player subprocess ID %lu", (unsigned long)pid));
- return START_OK;
+ /* Play the track */
+ play_track(q->pl,
+ params->argv, params->argc,
+ params->rawpath,
+ q->track);
+ return 0;
}
+/** @brief Prepare a track for later play
+ * @return @ref START_OK, @ref START_HARDFAIL or @ref START_SOFTFAIL
+ *
+ * Only applies to raw-format (i.e. speaker-using) players; everything else
+ * gets @c START_OK.
+ */
int prepare(ev_source *ev,
struct queue_entry *q) {
- int n;
+ const struct stringlist *player;
+ /* If there's a decoder (or player!) going we do nothing */
+ if(q->pid >= 0)
+ return START_OK;
+ /* If the track is already prepared, do nothing */
+ if(q->prepared)
+ return START_OK;
/* Find the player plugin */
- if(find_player_pid(q->id) > 0) return 0; /* Already going. */
- if((n = find_player(q)) < 0) return -1; /* No player */
- q->pl = open_plugin(config->player.s[n].s[1], 0); /* No player */
+ if(!(player = find_player(q)) < 0)
+ return START_HARDFAIL; /* No player */
+ q->pl = open_plugin(player->s[1], 0);
q->type = play_get_type(q->pl);
if((q->type & DISORDER_PLAYER_TYPEMASK) != DISORDER_PLAYER_RAW)
- return 0; /* Not a raw player */
- return start(ev, q, 1/*prepare_only*/); /* Prepare it */
+ return START_OK; /* Not a raw player */
+ const int rc = play_background(ev, player, q, prepare_child, NULL);
+ if(rc == START_OK) {
+ ev_child(ev, q->pid, 0, player_finished, q);
+ q->prepared = 1;
+ }
+ return rc;
+}
+
+/** @brief Child-process half of prepare() */
+static int prepare_child(struct queue_entry *q,
+ const struct pbgc_params *params,
+ void attribute((unused)) *bgdata) {
+ /* np will be the pipe to disorder-normalize */
+ int np[2];
+ if(socketpair(PF_UNIX, SOCK_STREAM, 0, np) < 0)
+ fatal(errno, "error calling socketpair");
+ /* Beware of the Leopard! On OS X 10.5.x, the order of the shutdown
+ * calls here DOES MATTER. If you do the SHUT_WR first then the SHUT_RD
+ * fails with "Socket is not connected". I think this is a bug but
+ * provided implementors either don't care about the order or all agree
+ * about the order, choosing the reliable order is an adequate
+ * workaround. */
+ xshutdown(np[1], SHUT_RD); /* decoder writes to np[1] */
+ xshutdown(np[0], SHUT_WR); /* normalize reads from np[0] */
+ blocking(np[0]);
+ blocking(np[1]);
+ /* Start disorder-normalize. We double-fork so that nothing has to wait
+ * for disorder-normalize. */
+ pid_t npid;
+ if(!(npid = xfork())) {
+ /* Grandchild of disorderd */
+ if(!xfork()) {
+ /* Great-grandchild of disorderd */
+ /* Connect to the speaker process */
+ struct sockaddr_un addr;
+ memset(&addr, 0, sizeof addr);
+ addr.sun_family = AF_UNIX;
+ snprintf(addr.sun_path, sizeof addr.sun_path,
+ "%s/speaker/socket", config->home);
+ int sfd = xsocket(PF_UNIX, SOCK_STREAM, 0);
+ if(connect(sfd, (const struct sockaddr *)&addr, sizeof addr) < 0)
+ fatal(errno, "connecting to %s", addr.sun_path);
+ /* Send the ID, with a NATIVE-ENDIAN 32 bit length */
+ uint32_t l = strlen(q->id);
+ if(write(sfd, &l, sizeof l) < 0
+ || write(sfd, q->id, l) < 0)
+ fatal(errno, "writing to %s", addr.sun_path);
+ /* Await the ack */
+ if (read(sfd, &l, 1) < 0)
+ fatal(errno, "reading ack from %s", addr.sun_path);
+ /* Plumbing */
+ xdup2(np[0], 0);
+ xdup2(sfd, 1);
+ xclose(np[0]);
+ xclose(np[1]);
+ xclose(sfd);
+ /* TODO stderr shouldn't be redirected for disorder-normalize
+ * (but it should be for play_track() */
+ execlp("disorder-normalize", "disorder-normalize",
+ log_default == &log_syslog ? "--syslog" : "--no-syslog",
+ "--config", configfile,
+ (char *)0);
+ fatal(errno, "executing disorder-normalize");
+ /* End of the great-grandchild of disorderd */
+ }
+ /* Back in the grandchild of disorderd */
+ _exit(0);
+ /* End of the grandchild of disorderd */
+ }
+ /* Back in the child of disorderd */
+ /* Wait for the grandchild of disordered to finish */
+ int n;
+ while(waitpid(npid, &n, 0) < 0 && errno == EINTR)
+ ;
+ /* Pass the file descriptor to the driver in an environment
+ * variable. */
+ char buffer[64];
+ snprintf(buffer, sizeof buffer, "DISORDER_RAW_FD=%d", np[1]);
+ if(putenv(buffer) < 0)
+ fatal(errno, "error calling putenv");
+ /* Close all the FDs we don't need */
+ xclose(np[0]);
+ /* Start the decoder itself */
+ play_track(q->pl,
+ params->argv, params->argc,
+ params->rawpath,
+ q->track);
+ return 0;
}
+/** @brief Abandon a queue entry
+ *
+ * Called from c_remove() (but NOT when scratching a track). Only does
+ * anything to raw-format tracks. Terminates the background decoder and tells
+ * the speaker process to cancel the track.
+ */
void abandon(ev_source attribute((unused)) *ev,
struct queue_entry *q) {
struct speaker_message sm;
- pid_t pid = find_player_pid(q->id);
- if(pid < 0) return; /* Not prepared. */
+ if(q->pid < 0)
+ return; /* Not prepared. */
if((q->type & DISORDER_PLAYER_TYPEMASK) != DISORDER_PLAYER_RAW)
return; /* Not a raw player. */
/* Terminate the player. */
- kill(-pid, config->signal);
- forget_player_pid(q->id);
+ kill(-q->pid, config->signal);
/* Cancel the track. */
memset(&sm, 0, sizeof sm);
sm.type = SM_CANCEL;
speaker_send(speaker_fd, &sm);
}
-int add_random_track(void) {
+/* Random tracks ------------------------------------------------------------ */
+
+/** @brief Called with a new random track
+ * @param ev Event loop
+ * @param track Track name
+ */
+static void chosen_random_track(ev_source *ev,
+ const char *track) {
+ struct queue_entry *q;
+
+ if(!track)
+ return;
+ /* Add the track to the queue */
+ q = queue_add(track, 0, WHERE_END, origin_random);
+ D(("picked %p (%s) at random", (void *)q, q->track));
+ queue_write();
+ /* Maybe a track can now be played */
+ play(ev);
+}
+
+/** @brief Maybe add a randomly chosen track
+ * @param ev Event loop
+ *
+ * Picking can take some time so the track will only be added after this
+ * function has returned.
+ */
+void add_random_track(ev_source *ev) {
struct queue_entry *q;
- const char *p;
long qlen = 0;
- int rc = 0;
/* If random play is not enabled then do nothing. */
if(shutting_down || !random_is_enabled())
- return 0;
+ return;
/* Count how big the queue is */
for(q = qhead.next; q != &qhead; q = q->next)
++qlen;
- /* Add random tracks until the queue is at the right size */
- while(qlen < config->queue_pad) {
- /* Try to pick a random track */
- if(!(p = trackdb_random(16))) {
- rc = -1;
- break;
- }
- /* Add it to the end of the queue. */
- q = queue_add(p, 0, WHERE_END);
- q->state = playing_random;
- D(("picked %p (%s) at random", (void *)q, q->track));
- ++qlen;
- }
- /* Commit the queue */
- queue_write();
- return rc;
+ /* If it's smaller than the desired size then add a track */
+ if(qlen < config->queue_pad)
+ trackdb_request_random(ev, chosen_random_track);
}
-/* try to play a track */
+/* Track initiation (part 2) ------------------------------------------------ */
+
+/** @brief Attempt to play something
+ *
+ * This is called from numerous locations - whenever it might conceivably have
+ * become possible to play something.
+ */
void play(ev_source *ev) {
struct queue_entry *q;
int random_enabled = random_is_enabled();
D(("play playing=%p", (void *)playing));
+ /* If we're shutting down, or there's something playing, or playing is not
+ * enabled, give up now */
if(shutting_down || playing || !playing_is_enabled()) return;
- /* If the queue is empty then add a random track. */
+ /* See if there's anything to play */
if(qhead.next == &qhead) {
- if(!random_enabled)
- return;
- if(add_random_track()) {
- /* On error, try again in 10s. */
- retry_play(ev, 10);
- return;
- }
- /* Now there must be at least one track in the queue. */
+ /* Queue is empty. We could just wait around since there are periodic
+ * attempts to add a random track anyway. However they are rarer than
+ * attempts to force a track so we initiate one now. */
+ add_random_track(ev);
+ /* chosen_random_track() will call play() when a new random track has been
+ * added to the queue. */
+ return;
}
+ /* There must be at least one track in the queue. */
q = qhead.next;
- /* If random play is disabled but the track is a random one then don't play
- * it. play() will be called again when random play is re-enabled. */
- if(!random_enabled && q->state == playing_random)
+ /* If random play is disabled but the track is a non-adopted random one
+ * then don't play it. play() will be called again when random play is
+ * re-enabled. */
+ if(!random_enabled && q->origin == origin_random)
return;
D(("taken %p (%s) from queue", (void *)q, q->track));
/* Try to start playing. */
- switch(start(ev, q, 0/*!prepare_only*/)) {
+ switch(start(ev, q)) {
case START_HARDFAIL:
if(q == qhead.next) {
queue_remove(q, 0); /* Abandon this track. */
queue_played(q);
recent_write();
}
- if(qhead.next == &qhead)
- /* Queue is empty, wait a bit before trying something else (so we don't
- * sit there looping madly in the presence of persistent problem). Note
- * that we might not reliably get a random track lookahead in this case,
- * but if we get here then really there are bigger problems. */
- retry_play(ev, 1);
- else
- /* More in queue, try again now. */
- play(ev);
+ /* Oh well, try the next one */
+ play(ev);
break;
case START_SOFTFAIL:
- /* Try same track again in a bit. */
- retry_play(ev, 10);
+ /* We'll try the same track again shortly. */
break;
case START_OK:
+ /* Remove from the queue */
if(q == qhead.next) {
queue_remove(q, 0);
queue_write();
}
+ /* It's become the playing track */
playing = q;
time(&playing->played);
playing->state = playing_started;
playing->submitter ? playing->submitter : (const char *)0,
(const char *)0);
/* Maybe add a random track. */
- add_random_track();
+ add_random_track(ev);
/* If there is another track in the queue prepare it now. This could
* potentially be a just-added random track. */
if(qhead.next != &qhead)
}
}
+/* Miscelleneous ------------------------------------------------------------ */
+
+/** @brief Return true if play is enabled */
int playing_is_enabled(void) {
const char *s = trackdb_get_global("playing");
return !s || !strcmp(s, "yes");
}
+/** @brief Enable play */
void enable_playing(const char *who, ev_source *ev) {
trackdb_set_global("playing", "yes", who);
/* Add a random track if necessary. */
- add_random_track();
+ add_random_track(ev);
play(ev);
}
+/** @brief Disable play */
void disable_playing(const char *who) {
trackdb_set_global("playing", "no", who);
}
+/** @brief Return true if random play is enabled */
int random_is_enabled(void) {
const char *s = trackdb_get_global("random-play");
return !s || !strcmp(s, "yes");
}
+/** @brief Enable random play */
void enable_random(const char *who, ev_source *ev) {
trackdb_set_global("random-play", "yes", who);
- add_random_track();
+ add_random_track(ev);
play(ev);
}
+/** @brief Disable random play */
void disable_random(const char *who) {
trackdb_set_global("random-play", "no", who);
}
+/* Scratching --------------------------------------------------------------- */
+
+/** @brief Scratch a track
+ * @param User responsible (or NULL)
+ * @param Track ID (or NULL for current)
+ */
void scratch(const char *who, const char *id) {
struct queue_entry *q;
struct speaker_message sm;
- pid_t pid;
D(("scratch playing=%p state=%d id=%s playing->id=%s",
(void *)playing,
playing ? playing->state : 0,
id ? id : "(none)",
playing ? playing->id : "(none)"));
+ /* There must be a playing track; it must be in a scratchable state; if a
+ * specific ID was mentioned it must be that track. */
if(playing
&& (playing->state == playing_started
|| playing->state == playing_paused)
&& (!id
|| !strcmp(id, playing->id))) {
+ /* Update state (for the benefit of the 'recent' list) */
playing->state = playing_scratched;
playing->scratched = who ? xstrdup(who) : 0;
- if((pid = find_player_pid(playing->id)) > 0) {
- D(("kill -%d %lu", config->signal, (unsigned long)pid));
- kill(-pid, config->signal);
- forget_player_pid(playing->id);
- } else
- error(0, "could not find PID for %s", playing->id);
+ /* Find the player and kill the whole process group */
+ if(playing->pid >= 0) {
+ D(("kill -%d -%lu", config->signal, (unsigned long)playing->pid));
+ kill(-playing->pid, config->signal);
+ }
+ /* Tell the speaker, if we think it'll care */
if((playing->type & DISORDER_PLAYER_TYPEMASK) == DISORDER_PLAYER_RAW) {
memset(&sm, 0, sizeof sm);
sm.type = SM_CANCEL;
* bother if playing is disabled) */
if(playing_is_enabled() && config->scratch.n) {
int r = rand() * (double)config->scratch.n / (RAND_MAX + 1.0);
- q = queue_add(config->scratch.s[r], who, WHERE_START);
- q->state = playing_isscratch;
+ q = queue_add(config->scratch.s[r], who, WHERE_START, origin_scratch);
}
notify_scratch(playing->track, playing->submitter, who,
time(0) - playing->played);
}
}
+/* Server termination ------------------------------------------------------- */
+
+/** @brief Called from quit() to tear down everything belonging to this file */
void quitting(ev_source *ev) {
struct queue_entry *q;
- pid_t pid;
/* Don't start anything new */
shutting_down = 1;
/* Shut down the current player */
if(playing) {
- if((pid = find_player_pid(playing->id)) > 0) {
- kill(-pid, config->signal);
- forget_player_pid(playing->id);
- } else
- error(0, "could not find PID for %s", playing->id);
+ if(playing->pid >= 0)
+ kill(-playing->pid, config->signal);
playing->state = playing_quitting;
finished(0);
}
- /* Zap any other players */
+ /* Zap any background decoders that are going */
for(q = qhead.next; q != &qhead; q = q->next)
- if((pid = find_player_pid(q->id)) > 0) {
- D(("kill -%d %lu", config->signal, (unsigned long)pid));
- kill(-pid, config->signal);
- forget_player_pid(q->id);
- } else
- error(0, "could not find PID for %s", q->id);
+ if(q->pid >= 0) {
+ D(("kill -%d %lu", config->signal, (unsigned long)q->pid));
+ kill(-q->pid, config->signal);
+ }
/* Don't need the speaker any more */
ev_fd_cancel(ev, ev_read, speaker_fd);
xclose(speaker_fd);
}
+/* Pause and resume --------------------------------------------------------- */
+
+/** @brief Pause the playing track */
int pause_playing(const char *who) {
struct speaker_message sm;
long played;
return 0;
}
+/** @brief Resume playing after a pause */
void resume_playing(const char *who) {
struct speaker_message sm;
if(!playing) return;
switch(playing->type & DISORDER_PLAYER_TYPEMASK) {
case DISORDER_PLAYER_STANDALONE:
- if(!playing->type & DISORDER_PLAYER_PAUSES) {
+ if(!(playing->type & DISORDER_PLAYER_PAUSES)) {
default:
/* Shouldn't happen */
return;
c-basic-offset:2
comment-column:40
fill-column:79
+indent-tabs-mode:nil
End:
*/
~mdw / disorder / blobdiff