[rygel] renderer-gst: Enable more playspeeds

[Jens Georg <jensgeorg src gnome org>]

commit 8cab0ca048af736008526f741b22e340cc1e7816
Author: Jussi Kukkonen <jussi kukkonen intel com>
Date:   Wed Oct 30 14:45:50 2013 +0200

    renderer-gst: Enable more playspeeds
    
    Negative playspeeds do not seem to work with common formats, so they
    have not been enabled.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=710368

 .../rygel-playbin-player.vala                      |   31 ++++++++++++++++---
 1 files changed, 26 insertions(+), 5 deletions(-)
---
diff --git a/src/librygel-renderer-gst/rygel-playbin-player.vala 
b/src/librygel-renderer-gst/rygel-playbin-player.vala
index 3a9cf4b..129a4c1 100644
--- a/src/librygel-renderer-gst/rygel-playbin-player.vala
+++ b/src/librygel-renderer-gst/rygel-playbin-player.vala
@@ -124,12 +124,18 @@ public class Rygel.Playbin.Player : GLib.Object, Rygel.MediaPlayer {
                     }
                 break;
                 case "PLAYING":
-                    if (state != State.PLAYING ||
-                        pending != State.VOID_PENDING) {
+                    if (this._new_playback_speed != this._playback_speed &&
+                        (state == State.PLAYING || state == State.PAUSED) &&
+                        pending == State.VOID_PENDING) {
+                        /* already playing, but play speed has changed */
                         this._playback_state = "TRANSITIONING";
+                        this.seek (this.position);
+                    } else if (state != State.PLAYING ||
+                               pending != State.VOID_PENDING) {
                         // This needs a check if GStreamer and DLNA agree on
                         // the "liveness" of the source (s0/sn increase in
                         // protocol info)
+                        this._playback_state = "TRANSITIONING";
                         this.is_live = this.playbin.set_state (State.PLAYING)
                                         == StateChangeReturn.NO_PREROLL;
                     } else {
@@ -145,13 +151,22 @@ public class Rygel.Playbin.Player : GLib.Object, Rygel.MediaPlayer {
         }
     }
 
-    private string[] _allowed_playback_speeds = {"1"};
+    private string[] _allowed_playback_speeds = {
+        "1/16", "1/8", "1/4", "1/2", "1", "2", "4", "8", "16", "32", "64"
+    };
     public string[] allowed_playback_speeds {
         owned get {
             return this._allowed_playback_speeds;
         }
     }
 
+    /**
+     * Actual _playback_speed is updated when playbin seek succeeds.
+     * Until that point, the playback speed set via api is stored in
+     * _new_playback_speed.
+     **/
+    private string _new_playback_speed = "1";
+
     private string _playback_speed = "1";
     public string playback_speed {
         owned get {
@@ -159,7 +174,10 @@ public class Rygel.Playbin.Player : GLib.Object, Rygel.MediaPlayer {
         }
 
         set {
-            this._playback_speed = value;
+            this._new_playback_speed = value;
+            /* theoretically we should trigger a seek here if we were
+             * playing already, but playback state does get changed
+             * after this when "Play" is invoked... */
         }
     }
 
@@ -357,7 +375,7 @@ public class Rygel.Playbin.Player : GLib.Object, Rygel.MediaPlayer {
     private bool seek_with_format (Format format, int64 target) {
         bool seeked;
 
-        var speed = this.play_speed_to_double (this._playback_speed);
+        var speed = this.play_speed_to_double (this._new_playback_speed);
         if (speed > 0) {
             seeked = this.playbin.seek (speed,
                                         format,
@@ -375,6 +393,9 @@ public class Rygel.Playbin.Player : GLib.Object, Rygel.MediaPlayer {
                                         Gst.SeekType.SET,
                                         target);
         }
+        if (seeked) {
+            this._playback_speed = this._new_playback_speed;
+        }
 
         return seeked;
     }