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-rw-r--r--src/queue/Playlist.cxx341
1 files changed, 341 insertions, 0 deletions
diff --git a/src/queue/Playlist.cxx b/src/queue/Playlist.cxx
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+++ b/src/queue/Playlist.cxx
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+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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
+ * (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.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "Playlist.hxx"
+#include "PlaylistError.hxx"
+#include "PlayerControl.hxx"
+#include "DetachedSong.hxx"
+#include "Idle.hxx"
+#include "Log.hxx"
+
+#include <assert.h>
+
+void
+playlist::TagModified(DetachedSong &&song)
+{
+ if (!playing)
+ return;
+
+ assert(current >= 0);
+
+ DetachedSong &current_song = queue.GetOrder(current);
+ if (song.IsSame(current_song))
+ current_song.MoveTagFrom(std::move(song));
+
+ queue.ModifyAtOrder(current);
+ queue.IncrementVersion();
+ idle_add(IDLE_PLAYLIST);
+}
+
+/**
+ * Queue a song, addressed by its order number.
+ */
+static void
+playlist_queue_song_order(playlist &playlist, PlayerControl &pc,
+ unsigned order)
+{
+ assert(playlist.queue.IsValidOrder(order));
+
+ playlist.queued = order;
+
+ const DetachedSong &song = playlist.queue.GetOrder(order);
+
+ FormatDebug(playlist_domain, "queue song %i:\"%s\"",
+ playlist.queued, song.GetURI());
+
+ pc.EnqueueSong(new DetachedSong(song));
+}
+
+/**
+ * Called if the player thread has started playing the "queued" song.
+ */
+static void
+playlist_song_started(playlist &playlist, PlayerControl &pc)
+{
+ assert(pc.next_song == nullptr);
+ assert(playlist.queued >= -1);
+
+ /* queued song has started: copy queued to current,
+ and notify the clients */
+
+ int current = playlist.current;
+ playlist.current = playlist.queued;
+ playlist.queued = -1;
+
+ if(playlist.queue.consume)
+ playlist.DeleteOrder(pc, current);
+
+ idle_add(IDLE_PLAYER);
+}
+
+const DetachedSong *
+playlist::GetQueuedSong() const
+{
+ return playing && queued >= 0
+ ? &queue.GetOrder(queued)
+ : nullptr;
+}
+
+void
+playlist::UpdateQueuedSong(PlayerControl &pc, const DetachedSong *prev)
+{
+ if (!playing)
+ return;
+
+ if (prev == nullptr && bulk_edit)
+ /* postponed until CommitBulk() to avoid always
+ queueing the first song that is being added (in
+ random mode) */
+ return;
+
+ assert(!queue.IsEmpty());
+ assert((queued < 0) == (prev == nullptr));
+
+ const int next_order = current >= 0
+ ? queue.GetNextOrder(current)
+ : 0;
+
+ if (next_order == 0 && queue.random && !queue.single) {
+ /* shuffle the song order again, so we get a different
+ order each time the playlist is played
+ completely */
+ const unsigned current_position =
+ queue.OrderToPosition(current);
+
+ queue.ShuffleOrder();
+
+ /* make sure that the current still points to
+ the current song, after the song order has been
+ shuffled */
+ current = queue.PositionToOrder(current_position);
+ }
+
+ const DetachedSong *const next_song = next_order >= 0
+ ? &queue.GetOrder(next_order)
+ : nullptr;
+
+ if (prev != nullptr && next_song != prev) {
+ /* clear the currently queued song */
+ pc.Cancel();
+ queued = -1;
+ }
+
+ if (next_order >= 0) {
+ if (next_song != prev)
+ playlist_queue_song_order(*this, pc, next_order);
+ else
+ queued = next_order;
+ }
+}
+
+void
+playlist::PlayOrder(PlayerControl &pc, int order)
+{
+ playing = true;
+ queued = -1;
+
+ const DetachedSong &song = queue.GetOrder(order);
+
+ FormatDebug(playlist_domain, "play %i:\"%s\"", order, song.GetURI());
+
+ pc.Play(new DetachedSong(song));
+ current = order;
+}
+
+static void
+playlist_resume_playback(playlist &playlist, PlayerControl &pc);
+
+void
+playlist::SyncWithPlayer(PlayerControl &pc)
+{
+ if (!playing)
+ /* this event has reached us out of sync: we aren't
+ playing anymore; ignore the event */
+ return;
+
+ pc.Lock();
+ const PlayerState pc_state = pc.GetState();
+ const DetachedSong *pc_next_song = pc.next_song;
+ pc.Unlock();
+
+ if (pc_state == PlayerState::STOP)
+ /* the player thread has stopped: check if playback
+ should be restarted with the next song. That can
+ happen if the playlist isn't filling the queue fast
+ enough */
+ playlist_resume_playback(*this, pc);
+ else {
+ /* check if the player thread has already started
+ playing the queued song */
+ if (pc_next_song == nullptr && queued != -1)
+ playlist_song_started(*this, pc);
+
+ pc.Lock();
+ pc_next_song = pc.next_song;
+ pc.Unlock();
+
+ /* make sure the queued song is always set (if
+ possible) */
+ if (pc_next_song == nullptr && queued < 0)
+ UpdateQueuedSong(pc, nullptr);
+ }
+}
+
+/**
+ * The player has stopped for some reason. Check the error, and
+ * decide whether to re-start playback
+ */
+static void
+playlist_resume_playback(playlist &playlist, PlayerControl &pc)
+{
+ assert(playlist.playing);
+ assert(pc.GetState() == PlayerState::STOP);
+
+ const auto error = pc.GetErrorType();
+ if (error == PlayerError::NONE)
+ playlist.error_count = 0;
+ else
+ ++playlist.error_count;
+
+ if ((playlist.stop_on_error && error != PlayerError::NONE) ||
+ error == PlayerError::OUTPUT ||
+ playlist.error_count >= playlist.queue.GetLength())
+ /* too many errors, or critical error: stop
+ playback */
+ playlist.Stop(pc);
+ else
+ /* continue playback at the next song */
+ playlist.PlayNext(pc);
+}
+
+void
+playlist::SetRepeat(PlayerControl &pc, bool status)
+{
+ if (status == queue.repeat)
+ return;
+
+ queue.repeat = status;
+
+ pc.SetBorderPause(queue.single && !queue.repeat);
+
+ /* if the last song is currently being played, the "next song"
+ might change when repeat mode is toggled */
+ UpdateQueuedSong(pc, GetQueuedSong());
+
+ idle_add(IDLE_OPTIONS);
+}
+
+static void
+playlist_order(playlist &playlist)
+{
+ if (playlist.current >= 0)
+ /* update playlist.current, order==position now */
+ playlist.current = playlist.queue.OrderToPosition(playlist.current);
+
+ playlist.queue.RestoreOrder();
+}
+
+void
+playlist::SetSingle(PlayerControl &pc, bool status)
+{
+ if (status == queue.single)
+ return;
+
+ queue.single = status;
+
+ pc.SetBorderPause(queue.single && !queue.repeat);
+
+ /* if the last song is currently being played, the "next song"
+ might change when single mode is toggled */
+ UpdateQueuedSong(pc, GetQueuedSong());
+
+ idle_add(IDLE_OPTIONS);
+}
+
+void
+playlist::SetConsume(bool status)
+{
+ if (status == queue.consume)
+ return;
+
+ queue.consume = status;
+ idle_add(IDLE_OPTIONS);
+}
+
+void
+playlist::SetRandom(PlayerControl &pc, bool status)
+{
+ if (status == queue.random)
+ return;
+
+ const DetachedSong *const queued_song = GetQueuedSong();
+
+ queue.random = status;
+
+ if (queue.random) {
+ /* shuffle the queue order, but preserve current */
+
+ const int current_position = playing
+ ? GetCurrentPosition()
+ : -1;
+
+ queue.ShuffleOrder();
+
+ if (current_position >= 0) {
+ /* make sure the current song is the first in
+ the order list, so the whole rest of the
+ playlist is played after that */
+ unsigned current_order =
+ queue.PositionToOrder(current_position);
+ queue.SwapOrders(0, current_order);
+ current = 0;
+ } else
+ current = -1;
+ } else
+ playlist_order(*this);
+
+ UpdateQueuedSong(pc, queued_song);
+
+ idle_add(IDLE_OPTIONS);
+}
+
+int
+playlist::GetCurrentPosition() const
+{
+ return current >= 0
+ ? queue.OrderToPosition(current)
+ : -1;
+}
+
+int
+playlist::GetNextPosition() const
+{
+ if (current < 0)
+ return -1;
+
+ if (queue.single && queue.repeat)
+ return queue.OrderToPosition(current);
+ else if (queue.IsValidOrder(current + 1))
+ return queue.OrderToPosition(current + 1);
+ else if (queue.repeat)
+ return queue.OrderToPosition(0);
+
+ return -1;
+}