grutil: Add muted/volume properties to HTMLVideoTexture

panda/src/grutil/htmlVideoTexture.cxx

@@ -229,6 +229,47 @@ is_playing() const {
   }, this);
 }
 
+/**
+ * Returns true if the video own audio is muted.  True by default.
+ */
+bool HTMLVideoTexture::
+is_muted() const {
+  return EM_ASM_INT({
+    return window._htmlVideoData[$0].video.muted;
+  }, this);
+}
+
+/**
+ * Sets whether the video's own audio is muted.
+ */
+void HTMLVideoTexture::
+set_muted(bool muted) {
+  EM_ASM({
+    window._htmlVideoData[$0].video.muted = ($1 !== 0);
+  }, this, muted);
+}
+
+/**
+ * Returns the audio volume of the video element, in the range 0.0 to 1.0.
+ */
+double HTMLVideoTexture::
+get_volume() const {
+  return EM_ASM_DOUBLE({
+    return window._htmlVideoData[$0].video.volume;
+  }, this);
+}
+
+/**
+ * Sets the audio volume in the range 0.0 to 1.0.  Note that you must also
+ * unmute the audio using the muted property.
+ */
+void HTMLVideoTexture::
+set_volume(double volume) {
+  EM_ASM({
+    window._htmlVideoData[$0].video.volume = $1;
+  }, this, volume);
+}
+
 /**
  * A factory function to make a new HTMLVideoTexture, used to pass to the
  * TexturePool.

panda/src/grutil/htmlVideoTexture.h

@@ -25,6 +25,10 @@
  * - No RAM access of video data is possible
  * - No explicit synchronization with audio
  * - No loop count
+ *
+ * Unlike MovieTexture, this has an additional "muted" attribute which is true
+ * by default but can be set to false in order to play the video's audio via
+ * the browser interface.  The "volume" property can configure the volume.
  */
 class EXPCL_PANDA_GRUTIL HTMLVideoTexture : public Texture {
 PUBLISHED:
@@ -47,6 +51,12 @@ PUBLISHED:
   double get_play_rate() const;
   bool is_playing() const;
 
+public:
+  bool is_muted() const;
+  void set_muted(bool muted);
+  double get_volume() const;
+  void set_volume(double volume);
+
 PUBLISHED:
   MAKE_PROPERTY(video_length, get_video_length);
   MAKE_PROPERTY(video_width, get_video_width);
@@ -57,6 +67,9 @@ PUBLISHED:
   MAKE_PROPERTY(play_rate, get_play_rate, set_play_rate);
   MAKE_PROPERTY(playing, is_playing);
 
+  MAKE_PROPERTY(muted, is_muted, set_muted);
+  MAKE_PROPERTY(volume, get_volume, set_volume);
+
 public:
   static PT(Texture) make_texture();