438 lines
17 KiB
Vala
438 lines
17 KiB
Vala
public enum Audrey.PlaybinState {
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STOPPED,
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PAUSED,
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PLAYING,
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}
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private struct Audrey.CommandCallback {
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unowned SourceFunc callback;
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int error;
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}
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public class Audrey.PlaybinSong : Object {
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private Subsonic.Song inner;
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public string id { get { return inner.id; } }
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public string title { get { return inner.title; } }
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public string artist { get { return inner.artist; } }
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public string album { get { return inner.album; } }
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public string? genre { get { return inner.genre; } }
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public int64 duration { get { return inner.duration; } }
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public int64 track { get { return inner.track; } }
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public int64 play_count { get { return inner.play_count; } }
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public Gdk.Paintable? thumbnail { get; private set; }
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private Cancellable cancel_loading_thumbnail;
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public PlaybinSong (Subsonic.Client api, Subsonic.Song song) {
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this.api = api;
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this.inner = song;
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}
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private Subsonic.Client api;
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public void need_cover_art () {
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/* TODO
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if (this.cancel_loading_thumbnail != null) return;
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if (this.thumbnail != null) return;
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this.cancel_loading_thumbnail = new Cancellable ();
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// TODO: dpi scaling maybe?? probably
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api.cover_art.begin (this.id, 50, Priority.LOW, this.cancel_loading_thumbnail, (obj, res) => {
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try {
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var pixbuf = api.cover_art.end (res);
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this.thumbnail = Gdk.Texture.for_pixbuf (pixbuf);
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} catch (Error e) {
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if (!(e is IOError.CANCELLED)) {
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warning ("could not fetch cover art for song %s: %s", this.id, e.message);
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}
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}
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this.cancel_loading_thumbnail = null;
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});
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*/
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}
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~PlaybinSong () {
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if (this.cancel_loading_thumbnail != null) {
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this.cancel_loading_thumbnail.cancel ();
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}
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}
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}
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public class Audrey.Playbin : GLib.Object {
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private Mpv.Handle mpv = new Mpv.Handle ();
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private int _volume = 100;
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private bool _mute = false;
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private ListStore _play_queue = new ListStore (typeof (PlaybinSong));
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// try to prevent wait_event to be called twice
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private bool is_handling_event = false;
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public PlaybinState state { get; private set; default = PlaybinState.STOPPED; }
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public int volume {
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get { return _volume; }
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set {
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var ret = mpv.set_property_int64 ("volume", value);
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if (ret >= 0) {
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_volume = value;
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} else {
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warning ("failed to set volume: %s", ret.to_string ());
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}
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}
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}
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public bool mute {
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get { return _mute; }
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set {
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var ret = mpv.set_property_flag ("mute", value);
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if (ret >= 0) {
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_mute = value;
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} else {
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warning ("failed to set mute status: %s", ret.to_string ());
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}
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}
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}
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// invariant: negative iff stopped, otherwise < play queue length
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public int play_queue_position { get; private set; default = -1; }
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// signalled when a new track is current
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public signal void new_track ();
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// signalled when the last track is over
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public signal void stopped ();
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// these are mostly synced with mpv
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public double position { get; private set; default = 0.0; }
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public double duration { get; private set; default = 0.0; }
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public weak Subsonic.Client api { get; set; default = null; }
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public ListModel play_queue { get { return this._play_queue; } }
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public uint play_queue_length { get; private set; default = 0; }
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private async Mpv.Error mpv_command_async (string[] args) {
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CommandCallback cc = {};
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this.mpv.command_async ((uint64) &cc, args);
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cc.callback = this.mpv_command_async.callback;
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yield;
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return cc.error;
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}
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public Playbin () {
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assert (this.mpv.initialize () >= 0);
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assert (this.mpv.set_property_string ("audio-client-name", "audrey") >= 0);
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assert (this.mpv.set_property_string ("user-agent", Audrey.Const.user_agent) >= 0);
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assert (this.mpv.set_property_string ("video", "no") >= 0);
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assert (this.mpv.set_property_string ("prefetch-playlist", "yes") >= 0);
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assert (this.mpv.set_property_string ("gapless-audio", "yes") >= 0);
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assert (this.mpv.observe_property (0, "time-pos", Mpv.Format.DOUBLE) >= 0);
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assert (this.mpv.observe_property (1, "duration", Mpv.Format.DOUBLE) >= 0);
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assert (this.mpv.observe_property (2, "playlist-pos", Mpv.Format.INT64) >= 0);
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assert (this.mpv.observe_property (3, "pause", Mpv.Format.FLAG) >= 0);
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this.mpv.wakeup_callback = () => {
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Idle.add (() => {
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if (this.is_handling_event) {
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warning ("main thread mpv wakeup callback called twice");
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return false;
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}
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this.is_handling_event = true;
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while (true) {
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var event = this.mpv.wait_event (0.0);
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if (event.event_id == Mpv.EventId.NONE) break;
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switch (event.event_id) {
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case Mpv.EventId.PROPERTY_CHANGE:
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var data = event.parse_property ();
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switch (event.reply_userdata) {
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case 0:
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assert (data.name == "time-pos");
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if (data.format == Mpv.Format.NONE) {
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this.position = 0.0;
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} else {
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this.position = data.parse_double ();
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}
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break;
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case 1:
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assert (data.name == "duration");
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if (data.format == Mpv.Format.NONE) {
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// this.duration = 0.0; i think this prevents the fallback below from working
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} else {
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this.duration = data.parse_double ();
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}
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break;
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case 2:
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// here as a sanity check
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// should always match our own play_queu_position/state
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assert (data.name == "playlist-pos");
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int64 playlist_pos = data.parse_int64 ();
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if (playlist_pos < 0) {
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if (this.state != PlaybinState.STOPPED) {
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error ("mpv has no current playlist entry, but we think it's index %d", this.play_queue_position);
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}
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assert (this.play_queue_position < 0);
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} else {
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if (this.state == PlaybinState.STOPPED) {
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error ("mpv is at playlist entry %d, but we're stopped", (int) playlist_pos);
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}
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if (this.play_queue_position != (int) playlist_pos) {
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error ("mpv is at playlist entry %d, but we think it's %d", (int) playlist_pos, this.play_queue_position);
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}
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}
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break;
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case 3:
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// also here as a sanity check
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// should always match our own state
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assert (data.name == "pause");
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bool pause = data.parse_flag ();
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if (pause && this.state != PlaybinState.PAUSED) {
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error (@"mpv is paused, but we are @(this.state)");
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}
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if (!pause && this.state == PlaybinState.PAUSED) {
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error ("mpv is not paused, but we are paused");
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}
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break;
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default:
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assert (false);
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break;
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}
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break;
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case Mpv.EventId.START_FILE:
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debug ("START_FILE received");
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// estimate duration from api data
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// while mpv doesn't know it
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this.duration = ((PlaybinSong) this._play_queue.get_item (this.play_queue_position)).duration;
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this.new_track ();
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break;
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case Mpv.EventId.END_FILE:
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var data = event.parse_end_file ();
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debug (@"END_FILE received (reason: $(data.reason))");
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if (data.error < 0) {
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warning ("playback of track aborted: %s", data.error.to_string ());
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}
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if (data.reason == Mpv.EndFileReason.EOF) {
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// assume this is a proper transition
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this.play_queue_position += 1;
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if (this.play_queue_position == this._play_queue.get_n_items ()) {
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// reached the end (?)
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this.state = PlaybinState.STOPPED;
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this.play_queue_position = -1;
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this.stopped ();
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}
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}
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break;
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case Mpv.EventId.COMMAND_REPLY:
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unowned CommandCallback *cc = (CommandCallback *) event.reply_userdata;
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cc.error = event.error;
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cc.callback ();
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break;
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default:
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// ignore by default
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break;
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}
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}
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this.is_handling_event = false;
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return false;
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});
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};
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}
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public void seek (double position) {
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var rc = this.mpv.command ({"seek", position.to_string (), "absolute"});
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if (rc < 0) {
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warning (@"could not seek to $position: $rc");
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} else {
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this.position = position;
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}
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}
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// manually changes which track in the play queue to play
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public void select_track (uint position)
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requires (position < this.play_queue.get_n_items ())
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{
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assert (this.mpv.command ({"playlist-play-index", position.to_string ()}) >= 0);
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this.play_queue_position = (int) position;
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this.state = PlaybinState.PLAYING;
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this.play (); // make sure mpv actually starts playing the track
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}
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public void pause () {
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assert (this.state != PlaybinState.STOPPED);
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this.state = PlaybinState.PAUSED;
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debug ("setting state to paused");
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// TODO: abstract away this handling around mpv api a bit for auto debug printing
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var ret = this.mpv.set_property_flag("pause", true);
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if (ret != 0) {
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debug (@"failed to set state to paused ($(ret)): $(ret.to_string())");
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}
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}
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public void play () {
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if (this.state == PlaybinState.STOPPED) {
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// allow only when playlist is not empty
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// and start from the top
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assert (this._play_queue.get_n_items () > 0);
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this.select_track (0);
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} else {
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this.state = PlaybinState.PLAYING;
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debug ("setting state to playing");
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var ret = this.mpv.set_property_flag("pause", false);
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if (ret != 0) {
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debug (@"failed to set state to playing ($(ret)): $(ret.to_string())");
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}
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}
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}
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public void go_to_next_track ()
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requires (this.state != PlaybinState.STOPPED)
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{
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if (this.play_queue_position+1 < this._play_queue.get_n_items ()) {
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this.play_queue_position += 1;
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assert (this.mpv.command ({"playlist-next-playlist"}) >= 0);
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} else {
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warning ("tried to skip forward at end of play queue, ignoring");
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}
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}
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public void go_to_prev_track ()
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requires (this.state != PlaybinState.STOPPED)
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{
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if (this.play_queue_position > 0) {
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this.play_queue_position -= 1;
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assert (this.mpv.command ({"playlist-prev-playlist"}) >= 0);
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} else {
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warning ("tried to skip to prev track at start of play queue, ignoring");
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}
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}
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public void remove_track (uint position)
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requires (position < this._play_queue.get_n_items ())
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{
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assert (this.mpv.command({"playlist-remove", position.to_string ()}) >= 0);
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this._play_queue.remove (position);
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this.play_queue_length -= 1;
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if (this.play_queue_position > position) this.play_queue_position -= 1;
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if (this.play_queue_position == this._play_queue.get_n_items ()) {
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// we just killed the last track
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this.state = PlaybinState.STOPPED;
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this.play_queue_position = -1;
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this.stopped ();
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}
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}
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public void clear () {
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assert (this.mpv.command({"playlist-clear"}) >= 0);
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if (this.state != PlaybinState.STOPPED) {
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assert (this.mpv.command({"playlist-remove", "current"}) >= 0);
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}
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this.state = PlaybinState.STOPPED;
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this._play_queue.remove_all ();
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this.play_queue_length = 0;
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this.play_queue_position = -1;
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this.stopped ();
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}
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public void append_track (Subsonic.Song song) {
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assert (this.mpv.command ({
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"loadfile",
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this.api.stream_uri (song.id),
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"append",
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}) >= 0);
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this._play_queue.append (new PlaybinSong (this.api, song));
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this.play_queue_length += 1;
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}
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public async void append_track_async (Subsonic.Song song) {
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var err = yield this.mpv_command_async ({
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"loadfile",
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this.api.stream_uri (song.id),
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"append",
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});
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assert (err >= 0);
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this._play_queue.append (new PlaybinSong (this.api, song));
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this.play_queue_length += 1;
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}
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public void move_track (uint from, uint to)
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requires (from < this._play_queue.get_n_items ())
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requires (to < this._play_queue.get_n_items ())
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{
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debug (@"moving track $from to $to");
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if (from < to) {
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// why offset to? because if the playlist is 01234,
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// mpv takes "move 1 to 3" to mean 02134, not 02314
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// that is, the target is a "gap", not a playlist entry
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// from -> 0 1 2 3 4 5
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// to -> 0 1 2 3 4 5 6
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assert(this.mpv.command({
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"playlist-move",
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from.to_string (),
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(to+1).to_string (),
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}) >= 0);
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// F0123T -> 0123TF
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var additions = new Object[to-from+1];
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for (uint i = from+1; i < to; i += 1) {
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additions[i-from-1] = this._play_queue.get_item (i);
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}
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additions[to-from-1] = this._play_queue.get_item (to);
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additions[to-from] = this._play_queue.get_item (from);
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this._play_queue.splice(from, to-from+1, additions);
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if (this.play_queue_position == (int) from) this.play_queue_position = (int) to;
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else if (this.play_queue_position > (int) from && this.play_queue_position <= (int) to) this.play_queue_position -= 1;
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} else if (from > to) {
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assert(this.mpv.command({
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"playlist-move",
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from.to_string (),
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to.to_string (),
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}) >= 0);
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// T0123F -> FT0123
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var additions = new Object[from-to+1];
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additions[0] = this._play_queue.get_item (from);
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for (uint i = to; i < from; i += 1) {
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additions[i-to+1] = this._play_queue.get_item (i);
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}
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this._play_queue.splice (to, from-to+1, additions);
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if (this.play_queue_position == (int) from) this.play_queue_position = (int) to;
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else if (this.play_queue_position >= (int) to && this.play_queue_position < (int) from) this.play_queue_position += 1;
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}
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}
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public void stop () {
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debug ("stopping playback");
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// don't clear the playlist, just in case (less state changes to sync)
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assert(this.mpv.command({"stop", "keep-playlist"}) >= 0);
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this.state = PlaybinState.STOPPED;
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this.play_queue_position = -1;
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this.stopped ();
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}
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~Playbin () {
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debug ("destroying playbin");
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}
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}
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