From 71659491c092a46f715362a8ecf49e392ddbb110 Mon Sep 17 00:00:00 2001
From: Rafostar <40623528+Rafostar@users.noreply.github.com>
Date: Sun, 13 Sep 2020 20:21:46 +0200
Subject: [PATCH] Support changing rank of codecs

The used GStreamer codecs are picked using rank hierarchy. When there are 2 or more decoders available that can handle the same stream type, the one with higher rank is always picked. This commit adds a function for the codec rank manipulation that can be used for e.g. force disable/enable VAAPI. Should be a neat feature once we have a settings dialog where it can be used.
---
 clapper_src/player.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/clapper_src/player.js b/clapper_src/player.js
index 32ece64a..82d28640 100644
--- a/clapper_src/player.js
+++ b/clapper_src/player.js
@@ -38,6 +38,8 @@ class ClapperPlayer extends GstPlayer.Player
         this.dispatcher = dispatcher;
         this.renderer = renderer;
 
+        this.gstRegistry = Gst.Registry.get();
+
         this._playerSignals = [];
         this._widgetSignals = [];
 
@@ -172,6 +174,20 @@ class ClapperPlayer extends GstPlayer.Player
         pipeline.subtitle_font_desc = desc;
     }
 
+    set_codec_rank(codec, rank)
+    {
+        debug(`changing rank of codec: ${codec}`);
+
+        let feature = this.gstRegistry.lookup_feature(codec);
+        if(!feature)
+            return debug(`codec unavailable: ${codec}`);
+
+        let oldRank = feature.get_rank();
+        feature.set_rank(rank);
+
+        debug(`changed rank: ${oldRank} -> ${rank} for ${codec}`);
+    }
+
     connect(signal, fn)
     {
         this._playerSignals.push(super.connect(signal, fn));