playlist: moved code to playlist_control.c

Moved handlers for control commands (play, stop, next, prev) to
playlist_control.c.

1 files changed, 249 insertions, 0 deletions

diff --git a/src/playlist_control.c b/src/playlist_control.c
new file mode 100644
index 000000000..22b922872
--- /dev/null
+++ b/src/playlist_control.c
@@ -0,0 +1,249 @@
+/*
+ * Copyright (C) 2003-2009 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/*
+ * Functions for controlling playback on the playlist level.
+ *
+ */
+
+#include "playlist_internal.h"
+#include "player_control.h"
+
+enum {
+	/**
+	 * When the "prev" command is received, rewind the current
+	 * track if this number of seconds has already elapsed.
+	 */
+	PLAYLIST_PREV_UNLESS_ELAPSED = 10,
+};
+
+void stopPlaylist(struct playlist *playlist)
+{
+	if (!playlist->playing)
+		return;
+
+	assert(playlist->current >= 0);
+
+	g_debug("playlist: stop");
+	playerWait();
+	playlist->queued = -1;
+	playlist->playing = false;
+
+	if (playlist->queue.random) {
+		/* shuffle the playlist, so the next playback will
+		   result in a new random order */
+
+		unsigned current_position =
+			queue_order_to_position(&playlist->queue,
+						playlist->current);
+
+		queue_shuffle_order(&playlist->queue);
+
+		/* make sure that "current" stays valid, and the next
+		   "play" command plays the same song again */
+		playlist->current =
+			queue_position_to_order(&playlist->queue,
+						current_position);
+	}
+}
+
+enum playlist_result playPlaylist(struct playlist *playlist, int song)
+{
+	unsigned i = song;
+
+	clearPlayerError();
+
+	if (song == -1) {
+		/* play any song ("current" song, or the first song */
+
+		if (queue_is_empty(&playlist->queue))
+			return PLAYLIST_RESULT_SUCCESS;
+
+		if (playlist->playing) {
+			/* already playing: unpause playback, just in
+			   case it was paused, and return */
+			playerSetPause(0);
+			return PLAYLIST_RESULT_SUCCESS;
+		}
+
+		/* select a song: "current" song, or the first one */
+		i = playlist->current >= 0
+			? playlist->current
+			: 0;
+	} else if (!queue_valid_position(&playlist->queue, song))
+		return PLAYLIST_RESULT_BAD_RANGE;
+
+	if (playlist->queue.random) {
+		if (song >= 0)
+			/* "i" is currently the song position (which
+			   would be equal to the order number in
+			   no-random mode); convert it to a order
+			   number, because random mode is enabled */
+			i = queue_position_to_order(&playlist->queue, song);
+
+		if (!playlist->playing)
+			playlist->current = 0;
+
+		/* swap the new song with the previous "current" one,
+		   so playback continues as planned */
+		queue_swap_order(&playlist->queue,
+				 i, playlist->current);
+		i = playlist->current;
+	}
+
+	playlist->stop_on_error = false;
+	playlist->error_count = 0;
+
+	playPlaylistOrderNumber(playlist, i);
+	return PLAYLIST_RESULT_SUCCESS;
+}
+
+enum playlist_result
+playPlaylistById(struct playlist *playlist, int id)
+{
+	int song;
+
+	if (id == -1) {
+		return playPlaylist(playlist, id);
+	}
+
+	song = queue_id_to_position(&playlist->queue, id);
+	if (song < 0)
+		return PLAYLIST_RESULT_NO_SUCH_SONG;
+
+	return playPlaylist(playlist, song);
+}
+
+void
+nextSongInPlaylist(struct playlist *playlist)
+{
+	int next_order;
+
+	if (!playlist->playing)
+		return;
+
+	assert(!queue_is_empty(&playlist->queue));
+	assert(queue_valid_order(&playlist->queue, playlist->current));
+
+	playlist->stop_on_error = false;
+
+	/* determine the next song from the queue's order list */
+
+	next_order = queue_next_order(&playlist->queue, playlist->current);
+	if (next_order < 0) {
+		/* no song after this one: stop playback */
+		stopPlaylist(playlist);
+		return;
+	}
+
+	if (next_order == 0 && playlist->queue.random) {
+		/* The queue told us that the next song is the first
+		   song.  This means we are in repeat mode.  Shuffle
+		   the queue order, so this time, the user hears the
+		   songs in a different than before */
+		assert(playlist->queue.repeat);
+
+		queue_shuffle_order(&playlist->queue);
+
+		/* note that playlist->current and playlist->queued are
+		   now invalid, but playPlaylistOrderNumber() will
+		   discard them anyway */
+	}
+
+	playPlaylistOrderNumber(playlist, next_order);
+}
+
+void previousSongInPlaylist(struct playlist *playlist)
+{
+	static time_t lastTime;
+	time_t diff = time(NULL) - lastTime;
+
+	lastTime += diff;
+
+	if (!playlist->playing)
+		return;
+
+	if (diff && getPlayerElapsedTime() > PLAYLIST_PREV_UNLESS_ELAPSED) {
+		/* re-start playing the current song (just like the
+		   "prev" button on CD players) */
+
+		playPlaylistOrderNumber(playlist, playlist->current);
+	} else {
+		if (playlist->current > 0) {
+			/* play the preceding song */
+			playPlaylistOrderNumber(playlist,
+						playlist->current - 1);
+		} else if (playlist->queue.repeat) {
+			/* play the last song in "repeat" mode */
+			playPlaylistOrderNumber(playlist,
+						queue_length(&playlist->queue) - 1);
+		} else {
+			/* re-start playing the current song if it's
+			   the first one */
+			playPlaylistOrderNumber(playlist, playlist->current);
+		}
+	}
+}
+
+enum playlist_result
+seekSongInPlaylist(struct playlist *playlist, unsigned song, float seek_time)
+{
+	const struct song *queued;
+	unsigned i;
+	int ret;
+
+	if (!queue_valid_position(&playlist->queue, song))
+		return PLAYLIST_RESULT_BAD_RANGE;
+
+	queued = playlist_get_queued_song(playlist);
+
+	if (playlist->queue.random)
+		i = queue_position_to_order(&playlist->queue, song);
+	else
+		i = song;
+
+	clearPlayerError();
+	playlist->stop_on_error = true;
+	playlist->error_count = 0;
+
+	if (!playlist->playing || (unsigned)playlist->current != i) {
+		/* seeking is not within the current song - first
+		   start playing the new song */
+
+		playPlaylistOrderNumber(playlist, i);
+		queued = NULL;
+	}
+
+	playlist_update_queued_song(playlist, queued);
+
+	ret = playerSeek(queue_get_order(&playlist->queue, i), seek_time);
+	if (ret < 0)
+		return PLAYLIST_RESULT_NOT_PLAYING;
+
+	return PLAYLIST_RESULT_SUCCESS;
+}
+
+enum playlist_result
+seekSongInPlaylistById(struct playlist *playlist, unsigned id, float seek_time)
+{
+	int song = queue_id_to_position(&playlist->queue, id);
+	if (song < 0)
+		return PLAYLIST_RESULT_NO_SUCH_SONG;
+
+	return seekSongInPlaylist(playlist, song, seek_time);
+}