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yet another playbin refactor

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This commit is contained in:
Erica Z 2024-10-20 13:17:40 +02:00
parent c880729d19
commit af127b8d7b
5 changed files with 150 additions and 78 deletions
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154
src/playbin.vala
View file

@ -35,48 +35,31 @@ public class Playbin : GLib.Object {
}
}
// invariant: equal to play queue length iff state is STOPPED
public uint play_queue_position { get; private set; }
public signal void now_playing (Subsonic.Song now, Subsonic.Song? next);
// signalled when a new track is current
public signal void new_track ();
// signalled when the last track is over
public signal void stopped ();
// set to false when manually switching tracks
private bool inc_position;
// these are mostly synced with mpv
public double position { get; private set; default = 0.0; }
public double duration { get; private set; default = 0.0; }
public Subsonic.Client api { get; set; default = null; }
public ListStore play_queue { get; private set; }
public ListStore _play_queue;
public ListModel play_queue { get { return this._play_queue; } }
private void on_play_queue_items_changed (ListModel play_queue, uint position, uint removed, uint added) {
for (uint i = 0; i < removed; i += 1) {
assert (this.mpv.command ({
"playlist-remove",
position.to_string (),
}) >= 0);
}
for (uint i = 0; i < added; i += 1) {
assert (this.mpv.command ({
"loadfile",
this.api.stream_uri (((Subsonic.Song) play_queue.get_item (position+i)).id),
"insert-at-play",
(position+i).to_string (),
}) >= 0);
}
if (this.play_queue_position == position && removed > 0) {
if (this.play_queue_position < this.play_queue.get_n_items ()) {
// edge case: new track plays, playlist-pos doesn't change, so now_playing never n gets triggered
this.now_playing (
(Subsonic.Song) this.play_queue.get_item (this.play_queue_position),
(Subsonic.Song?) this.play_queue.get_item (this.play_queue_position+1));
}
}
}
// try to prevent wait_event to be called twice
private bool is_handling_event = false;
public Playbin () {
this.play_queue = new ListStore (typeof (Subsonic.Song));
this.play_queue.items_changed.connect (this.on_play_queue_items_changed);
this._play_queue = new ListStore (typeof (Subsonic.Song));
assert (this.mpv.initialize () >= 0);
assert (this.mpv.set_property_string ("user-agent", Audrey.Const.user_agent) >= 0);
@ -86,9 +69,13 @@ public class Playbin : GLib.Object {
assert (this.mpv.observe_property (0, "time-pos", Mpv.Format.DOUBLE) >= 0);
assert (this.mpv.observe_property (1, "duration", Mpv.Format.DOUBLE) >= 0);
assert (this.mpv.observe_property (2, "playlist-pos", Mpv.Format.INT64) >= 0);
assert (this.mpv.observe_property (3, "pause", Mpv.Format.FLAG) >= 0);
this.mpv.wakeup_callback = () => {
Idle.add (() => {
if (this.is_handling_event) return false;
this.is_handling_event = true;
while (true) {
var event = this.mpv.wait_event (0.0);
if (event.event_id == Mpv.EventId.NONE) break;
@ -116,18 +103,35 @@ public class Playbin : GLib.Object {
break;
case 2:
// here as a sanity check
// should always match our own play_queu_position/state
assert (data.name == "playlist-pos");
if (data.parse_int64 () < 0) {
debug ("playlist-pos is null, sending stopped event");
this.play_queue_position = this.play_queue.get_n_items ();
this.state = PlaybinState.STOPPED;
this.stopped ();
int64 playlist_pos = data.parse_int64 ();
if (playlist_pos < 0) {
if (this.state != PlaybinState.STOPPED) {
error ("mpv has no current playlist entry, but we think it's index %u", this.play_queue_position);
}
assert (this.play_queue_position == this.play_queue.get_n_items ());
} else {
this.play_queue_position = (uint) data.parse_int64 ();
debug (@"playlist-pos has been updated to $(this.play_queue_position)");
this.now_playing (
(Subsonic.Song) this.play_queue.get_item (this.play_queue_position),
(Subsonic.Song?) this.play_queue.get_item (this.play_queue_position+1));
if (this.state == PlaybinState.STOPPED) {
error ("mpv is at playlist entry %u, but we're stopped", (uint) playlist_pos);
}
if (this.play_queue_position != (uint) playlist_pos) {
error ("mpv is at playlist entry %u, but we think it's %u", (uint) playlist_pos, this.play_queue_position);
}
}
break;
case 3:
// also here as a sanity check
// should always match our own state
assert (data.name == "pause");
bool pause = data.parse_flag ();
if (pause && this.state != PlaybinState.PAUSED) {
error (@"mpv is paused, but we are @(this.state)");
}
if (!pause && this.state == PlaybinState.PAUSED) {
error ("mpv is not paused, but we are paused");
}
break;
@ -139,6 +143,12 @@ public class Playbin : GLib.Object {
case Mpv.EventId.START_FILE:
debug ("START_FILE received");
if (this.inc_position) {
this.play_queue_position += 1;
} else {
this.inc_position = true;
}
this.new_track ();
break;
case Mpv.EventId.END_FILE:
@ -147,6 +157,15 @@ public class Playbin : GLib.Object {
if (data.error < 0) {
warning ("playback of track aborted: %s", data.error.to_string ());
}
if (this.inc_position) {
// reached the end
this.play_queue_position += 1;
assert (this.play_queue_position == this._play_queue.get_n_items ());
this.state = PlaybinState.STOPPED;
this.stopped ();
}
break;
default:
@ -155,6 +174,7 @@ public class Playbin : GLib.Object {
}
}
this.is_handling_event = false;
return false;
});
};
@ -171,6 +191,8 @@ public class Playbin : GLib.Object {
{
assert (this.mpv.command ({"playlist-play-index", position.to_string ()}) >= 0);
this.state = PlaybinState.PLAYING;
this.play_queue_position = position;
this.inc_position = false;
}
public void pause () {
@ -194,15 +216,55 @@ public class Playbin : GLib.Object {
}
}
public void next_track () {
assert (this.state != PlaybinState.STOPPED);
this.state = PlaybinState.PLAYING;
public void go_to_next_track ()
requires (this.state != PlaybinState.STOPPED)
{
if (this.play_queue_position+1 < this._play_queue.get_n_items ()) {
this.inc_position = false;
this.play_queue_position += 1;
assert (this.mpv.command ({"playlist-next-playlist"}) >= 0);
} else {
warning ("tried to skip forward at end of play queue, ignoring");
}
}
public void prev_track () {
assert (this.state != PlaybinState.STOPPED);
this.state = PlaybinState.PLAYING;
public void go_to_prev_track ()
requires (this.state != PlaybinState.STOPPED)
{
if (this.play_queue_position > 0) {
this.inc_position = false;
this.play_queue_position -= 1;
assert (this.mpv.command ({"playlist-prev-playlist"}) >= 0);
} else {
warning ("tried to skip to prev track at start of play queue, ignoring");
}
}
public void remove_track (uint position)
requires (position < this._play_queue.get_n_items ())
{
assert (false); // TODO
}
public void clear () {
assert (this.mpv.command({"playlist-clear"}) >= 0);
if (this.state != PlaybinState.STOPPED) {
assert (this.mpv.command({"playlist-remove", "current"}) >= 0);
}
this.state = PlaybinState.STOPPED;
this._play_queue.remove_all ();
this.play_queue_position = 0;
this.stopped ();
}
public void append_track (Subsonic.Song song) {
assert (this.mpv.command({
"loadfile",
this.api.stream_uri (song.id),
"append",
}) >= 0);
if (this.state == STOPPED) this.play_queue_position += 1;
this._play_queue.append (song);
}
}

4
src/ui/play_queue.vala
View file

@ -28,7 +28,7 @@ class Ui.PlayQueueSong : Gtk.ListBoxRow {
var remove = new SimpleAction ("remove", null);
remove.activate.connect (() => {
this.playbin.play_queue.remove (this.displayed_position-1);
this.playbin.remove_track (this.displayed_position-1);
});
action_group.add_action (remove);
@ -89,7 +89,7 @@ public class Ui.PlayQueue : Adw.NavigationPage {
public bool can_clear_all { get; private set; }
[GtkCallback] private void on_clear () {
this.playbin.play_queue.remove_all ();
this.playbin.clear ();
}
private void on_store_items_changed (GLib.ListModel store, uint position, uint removed, uint added) {

4
src/ui/playbar.vala
View file

@ -45,11 +45,11 @@ class Ui.Playbar : Gtk.Box {
}
[GtkCallback] private void on_skip_forward_clicked () {
this.playbin.next_track ();
this.playbin.go_to_next_track ();
}
[GtkCallback] private void on_skip_backward_clicked () {
this.playbin.prev_track ();
this.playbin.go_to_prev_track ();
}
[GtkCallback] private void seek_backward () {

56
src/ui/window.vala
View file

@ -33,6 +33,32 @@ class Ui.Window : Adw.ApplicationWindow {
Object (application: app);
}
private void now_playing (Subsonic.Song song) {
this.song = song;
// api.scrobble.begin (this.song.id); TODO
if (this.cancel_loading_art != null) {
this.cancel_loading_art.cancel ();
}
this.cancel_loading_art = new GLib.Cancellable ();
this.playing_cover_art = null; // TODO: preload next art somehow
this.cover_art_loading = true;
string song_id = this.song.id;
this.api.cover_art.begin (song_id, this.cancel_loading_art, (obj, res) => {
try {
this.playing_cover_art = Gdk.Texture.for_pixbuf (this.api.cover_art.end (res));
this.cover_art_loading = false;
} catch (Error e) {
if (!(e is IOError.CANCELLED)) {
warning ("could not load cover for %s: %s", song_id, e.message);
this.cover_art_loading = false;
}
}
});
}
construct {
// TODO: mpris
// Bus.own_name (
@ -58,30 +84,8 @@ class Ui.Window : Adw.ApplicationWindow {
this.sidebar.select_row (this.sidebar.get_row_at_index (0));
this.playbin.now_playing.connect ((playbin, now, next) => {
this.song = now;
api.scrobble.begin (this.song.id);
if (this.cancel_loading_art != null) {
this.cancel_loading_art.cancel ();
}
this.cancel_loading_art = new GLib.Cancellable ();
this.playing_cover_art = null; // TODO: preload next art somehow
this.cover_art_loading = true;
string song_id = this.song.id;
this.api.cover_art.begin (song_id, this.cancel_loading_art, (obj, res) => {
try {
this.playing_cover_art = Gdk.Texture.for_pixbuf (this.api.cover_art.end (res));
this.cover_art_loading = false;
} catch (Error e) {
if (!(e is IOError.CANCELLED)) {
warning ("could not load cover for %s: %s", song_id, e.message);
this.cover_art_loading = false;
}
}
});
this.playbin.new_track.connect (() => {
this.now_playing (this.playbin.play_queue.get_item (this.playbin.play_queue_position) as Subsonic.Song);
});
this.playbin.stopped.connect (() => {
@ -92,9 +96,9 @@ class Ui.Window : Adw.ApplicationWindow {
this.shuffle_all_tracks.sensitive = true;
this.shuffle_all_tracks.activated.connect (() => {
this.shuffle_all_tracks.sensitive = false;
this.playbin.play_queue.remove_all ();
this.playbin.clear ();
api.get_random_songs.begin (null, (song) => {
this.playbin.play_queue.append (song);
this.playbin.append_track (song);
}, (obj, res) => {
try {
api.get_random_songs.end (res);

6
src/vapi/mpv.vapi
View file

@ -143,6 +143,12 @@ namespace Mpv {
{
return * (double *) data;
}
public bool parse_flag ()
requires (format == Format.FLAG)
{
return (* (int *) data) == 1;
}
}
[CCode (cname = "mpv_event_end_file", destroy_function = "", has_type_id = false, has_copy_function = false)]