void
queue_shuffle_order(struct queue *queue)
{
assert(queue->random);
for (unsigned i = 0; i < queue->length; i++)
queue_swap_order(queue, i,
g_rand_int_range(queue->rand, i,
queue->length));
}
enum playlist_result
playlist_play(struct playlist *playlist, struct player_control *pc,
int song)
{
unsigned i = song;
pc_clear_error(pc);
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 */
pc_set_pause(pc, false);
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;
playlist_play_order(playlist, pc, i);
return PLAYLIST_RESULT_SUCCESS;
}
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);
}
enum playlist_result
playlist_swap_songs(struct playlist *playlist, struct player_control *pc,
unsigned song1, unsigned song2)
{
const struct song *queued;
if (!queue_valid_position(&playlist->queue, song1) ||
!queue_valid_position(&playlist->queue, song2))
return PLAYLIST_RESULT_BAD_RANGE;
queued = playlist_get_queued_song(playlist);
queue_swap(&playlist->queue, song1, song2);
if (playlist->queue.random) {
/* update the queue order, so that playlist->current
still points to the current song order */
queue_swap_order(&playlist->queue,
queue_position_to_order(&playlist->queue,
song1),
queue_position_to_order(&playlist->queue,
song2));
} else {
/* correct the "current" song order */
if (playlist->current == (int)song1)
playlist->current = song2;
else if (playlist->current == (int)song2)
playlist->current = song1;
}
playlist_increment_version(playlist);
playlist_update_queued_song(playlist, pc, queued);
return PLAYLIST_RESULT_SUCCESS;
}
void
queue_shuffle_order_last(struct queue *queue, unsigned start, unsigned end)
{
queue_swap_order(queue, end - 1,
g_rand_int_range(queue->rand, start, end));
}