playlist: convert to C++

1 files changed, 452 insertions, 0 deletions

diff --git a/src/Playlist.cxx b/src/Playlist.cxx
new file mode 100644
index 00000000..de2daf14
--- /dev/null
+++ b/src/Playlist.cxx
@@ -0,0 +1,452 @@
+/*
+ * Copyright (C) 2003-2013 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 "PlaylistInternal.hxx"
+#include "song.h"
+
+extern "C" {
+#include "player_control.h"
+#include "conf.h"
+#include "idle.h"
+}
+
+#include <glib.h>
+
+#include <assert.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "playlist"
+
+void
+playlist_increment_version_all(struct playlist *playlist)
+{
+	queue_modify_all(&playlist->queue);
+	idle_add(IDLE_PLAYLIST);
+}
+
+void
+playlist_tag_changed(struct playlist *playlist)
+{
+	if (!playlist->playing)
+		return;
+
+	assert(playlist->current >= 0);
+
+	queue_modify(&playlist->queue, playlist->current);
+	idle_add(IDLE_PLAYLIST);
+}
+
+void
+playlist_init(struct playlist *playlist)
+{
+	queue_init(&playlist->queue,
+		   config_get_positive(CONF_MAX_PLAYLIST_LENGTH,
+				       DEFAULT_PLAYLIST_MAX_LENGTH));
+
+	playlist->queued = -1;
+	playlist->current = -1;
+}
+
+void
+playlist_finish(struct playlist *playlist)
+{
+	queue_finish(&playlist->queue);
+}
+
+/**
+ * Queue a song, addressed by its order number.
+ */
+static void
+playlist_queue_song_order(struct playlist *playlist, struct player_control *pc,
+			  unsigned order)
+{
+	char *uri;
+
+	assert(queue_valid_order(&playlist->queue, order));
+
+	playlist->queued = order;
+
+	struct song *song =
+		song_dup_detached(queue_get_order(&playlist->queue, order));
+
+	uri = song_get_uri(song);
+	g_debug("queue song %i:\"%s\"", playlist->queued, uri);
+	g_free(uri);
+
+	pc_enqueue_song(pc, song);
+}
+
+/**
+ * Called if the player thread has started playing the "queued" song.
+ */
+static void
+playlist_song_started(struct playlist *playlist, struct player_control *pc)
+{
+	assert(pc->next_song == NULL);
+	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_delete(playlist, pc,
+				queue_order_to_position(&playlist->queue,
+							current));
+
+	idle_add(IDLE_PLAYER);
+}
+
+const struct song *
+playlist_get_queued_song(struct playlist *playlist)
+{
+	if (!playlist->playing || playlist->queued < 0)
+		return NULL;
+
+	return queue_get_order(&playlist->queue, playlist->queued);
+}
+
+void
+playlist_update_queued_song(struct playlist *playlist,
+			    struct player_control *pc,
+			    const struct song *prev)
+{
+	int next_order;
+	const struct song *next_song;
+
+	if (!playlist->playing)
+		return;
+
+	assert(!queue_is_empty(&playlist->queue));
+	assert((playlist->queued < 0) == (prev == NULL));
+
+	next_order = playlist->current >= 0
+		? queue_next_order(&playlist->queue, playlist->current)
+		: 0;
+
+	if (next_order == 0 && playlist->queue.random &&
+	    !playlist->queue.single) {
+		/* shuffle the song order again, so we get a different
+		   order each time the playlist is played
+		   completely */
+		unsigned current_position =
+			queue_order_to_position(&playlist->queue,
+						playlist->current);
+
+		queue_shuffle_order(&playlist->queue);
+
+		/* make sure that the playlist->current still points to
+		   the current song, after the song order has been
+		   shuffled */
+		playlist->current =
+			queue_position_to_order(&playlist->queue,
+						current_position);
+	}
+
+	if (next_order >= 0)
+		next_song = queue_get_order(&playlist->queue, next_order);
+	else
+		next_song = NULL;
+
+	if (prev != NULL && next_song != prev) {
+		/* clear the currently queued song */
+		pc_cancel(pc);
+		playlist->queued = -1;
+	}
+
+	if (next_order >= 0) {
+		if (next_song != prev)
+			playlist_queue_song_order(playlist, pc, next_order);
+		else
+			playlist->queued = next_order;
+	}
+}
+
+void
+playlist_play_order(struct playlist *playlist, struct player_control *pc,
+		    int orderNum)
+{
+	char *uri;
+
+	playlist->playing = true;
+	playlist->queued = -1;
+
+	struct song *song =
+		song_dup_detached(queue_get_order(&playlist->queue, orderNum));
+
+	uri = song_get_uri(song);
+	g_debug("play %i:\"%s\"", orderNum, uri);
+	g_free(uri);
+
+	pc_play(pc, song);
+	playlist->current = orderNum;
+}
+
+static void
+playlist_resume_playback(struct playlist *playlist, struct player_control *pc);
+
+/**
+ * This is the "PLAYLIST" event handler.  It is invoked by the player
+ * thread whenever it requests a new queued song, or when it exits.
+ */
+void
+playlist_sync(struct playlist *playlist, struct player_control *pc)
+{
+	if (!playlist->playing)
+		/* this event has reached us out of sync: we aren't
+		   playing anymore; ignore the event */
+		return;
+
+	player_lock(pc);
+	enum player_state pc_state = pc_get_state(pc);
+	const struct song *pc_next_song = pc->next_song;
+	player_unlock(pc);
+
+	if (pc_state == PLAYER_STATE_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(playlist, pc);
+	else {
+		/* check if the player thread has already started
+		   playing the queued song */
+		if (pc_next_song == NULL && playlist->queued != -1)
+			playlist_song_started(playlist, pc);
+
+		player_lock(pc);
+		pc_next_song = pc->next_song;
+		player_unlock(pc);
+
+		/* make sure the queued song is always set (if
+		   possible) */
+		if (pc_next_song == NULL && playlist->queued < 0)
+			playlist_update_queued_song(playlist, pc, NULL);
+	}
+}
+
+/**
+ * The player has stopped for some reason.  Check the error, and
+ * decide whether to re-start playback
+ */
+static void
+playlist_resume_playback(struct playlist *playlist, struct player_control *pc)
+{
+	enum player_error error;
+
+	assert(playlist->playing);
+	assert(pc_get_state(pc) == PLAYER_STATE_STOP);
+
+	error = pc_get_error_type(pc);
+	if (error == PLAYER_ERROR_NONE)
+		playlist->error_count = 0;
+	else
+		++playlist->error_count;
+
+	if ((playlist->stop_on_error && error != PLAYER_ERROR_NONE) ||
+	    error == PLAYER_ERROR_OUTPUT ||
+	    playlist->error_count >= queue_length(&playlist->queue))
+		/* too many errors, or critical error: stop
+		   playback */
+		playlist_stop(playlist, pc);
+	else
+		/* continue playback at the next song */
+		playlist_next(playlist, pc);
+}
+
+bool
+playlist_get_repeat(const struct playlist *playlist)
+{
+	return playlist->queue.repeat;
+}
+
+bool
+playlist_get_random(const struct playlist *playlist)
+{
+	return playlist->queue.random;
+}
+
+bool
+playlist_get_single(const struct playlist *playlist)
+{
+	return playlist->queue.single;
+}
+
+bool
+playlist_get_consume(const struct playlist *playlist)
+{
+	return playlist->queue.consume;
+}
+
+void
+playlist_set_repeat(struct playlist *playlist, struct player_control *pc,
+		    bool status)
+{
+	if (status == playlist->queue.repeat)
+		return;
+
+	struct queue *queue = &playlist->queue;
+
+	queue->repeat = status;
+
+	pc_set_border_pause(pc, queue->single && !queue->repeat);
+
+	/* if the last song is currently being played, the "next song"
+	   might change when repeat mode is toggled */
+	playlist_update_queued_song(playlist, pc,
+				    playlist_get_queued_song(playlist));
+
+	idle_add(IDLE_OPTIONS);
+}
+
+static void
+playlist_order(struct playlist *playlist)
+{
+	if (playlist->current >= 0)
+		/* update playlist.current, order==position now */
+		playlist->current = queue_order_to_position(&playlist->queue,
+							    playlist->current);
+
+	queue_restore_order(&playlist->queue);
+}
+
+void
+playlist_set_single(struct playlist *playlist, struct player_control *pc,
+		    bool status)
+{
+	if (status == playlist->queue.single)
+		return;
+
+	struct queue *queue = &playlist->queue;
+
+	queue->single = status;
+
+	pc_set_border_pause(pc, queue->single && !queue->repeat);
+
+	/* if the last song is currently being played, the "next song"
+	   might change when single mode is toggled */
+	playlist_update_queued_song(playlist, pc,
+				    playlist_get_queued_song(playlist));
+
+	idle_add(IDLE_OPTIONS);
+}
+
+void
+playlist_set_consume(struct playlist *playlist, bool status)
+{
+	if (status == playlist->queue.consume)
+		return;
+
+	playlist->queue.consume = status;
+	idle_add(IDLE_OPTIONS);
+}
+
+void
+playlist_set_random(struct playlist *playlist, struct player_control *pc,
+		    bool status)
+{
+	const struct song *queued;
+
+	if (status == playlist->queue.random)
+		return;
+
+	queued = playlist_get_queued_song(playlist);
+
+	playlist->queue.random = status;
+
+	if (playlist->queue.random) {
+		/* shuffle the queue order, but preserve
+		   playlist->current */
+
+		int current_position =
+			playlist->playing && playlist->current >= 0
+			? (int)queue_order_to_position(&playlist->queue,
+						       playlist->current)
+			: -1;
+
+		queue_shuffle_order(&playlist->queue);
+
+		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_position_to_order(&playlist->queue,
+							current_position);
+			queue_swap_order(&playlist->queue, 0, current_order);
+			playlist->current = 0;
+		} else
+			playlist->current = -1;
+	} else
+		playlist_order(playlist);
+
+	playlist_update_queued_song(playlist, pc, queued);
+
+	idle_add(IDLE_OPTIONS);
+}
+
+int
+playlist_get_current_song(const struct playlist *playlist)
+{
+	if (playlist->current >= 0)
+		return queue_order_to_position(&playlist->queue,
+					       playlist->current);
+
+	return -1;
+}
+
+int
+playlist_get_next_song(const struct playlist *playlist)
+{
+	if (playlist->current >= 0)
+	{
+		if (playlist->queue.single == 1 && playlist->queue.repeat == 1)
+			return queue_order_to_position(&playlist->queue,
+			                               playlist->current);
+		else if (playlist->current + 1 < (int)queue_length(&playlist->queue))
+			return queue_order_to_position(&playlist->queue,
+					       playlist->current + 1);
+		else if (playlist->queue.repeat == 1)
+			return queue_order_to_position(&playlist->queue, 0);
+	}
+
+	return -1;
+}
+
+unsigned long
+playlist_get_version(const struct playlist *playlist)
+{
+	return playlist->queue.version;
+}
+
+int
+playlist_get_length(const struct playlist *playlist)
+{
+	return queue_length(&playlist->queue);
+}
+
+unsigned
+playlist_get_song_id(const struct playlist *playlist, unsigned song)
+{
+	return queue_position_to_id(&playlist->queue, song);
+}