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-rw-r--r--src/playlist_control.c249
1 files changed, 249 insertions, 0 deletions
diff --git a/src/playlist_control.c b/src/playlist_control.c
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+++ b/src/playlist_control.c
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+/*
+ * 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);
+}