videoencoder: Add sink_query() src_query() virtual functions

Based on the videodecoder change by Nicolas Dufresne and applied
here for consistency.

https://bugzilla.gnome.org/show_bug.cgi?id=720103

gst-libs/gst/video/gstvideoencoder.c

@@ -235,6 +235,11 @@ static gboolean gst_video_encoder_negotiate_default (GstVideoEncoder * encoder);
 static gboolean gst_video_encoder_negotiate_unlocked (GstVideoEncoder *
     encoder);
 
+static gboolean gst_video_encoder_sink_query_default (GstVideoEncoder * encoder,
+    GstQuery * query);
+static gboolean gst_video_encoder_src_query_default (GstVideoEncoder * encoder,
+    GstQuery * query);
+
 /* we can't use G_DEFINE_ABSTRACT_TYPE because we need the klass in the _init
  * method to get to the padtemplates */
 GType
@@ -296,6 +301,8 @@ gst_video_encoder_class_init (GstVideoEncoderClass * klass)
   klass->propose_allocation = gst_video_encoder_propose_allocation_default;
   klass->decide_allocation = gst_video_encoder_decide_allocation_default;
   klass->negotiate = gst_video_encoder_negotiate_default;
+  klass->sink_query = gst_video_encoder_sink_query_default;
+  klass->src_query = gst_video_encoder_src_query_default;
 }
 
 static gboolean
@@ -812,14 +819,12 @@ config_failed:
 }
 
 static gboolean
-gst_video_encoder_sink_query (GstPad * pad, GstObject * parent,
+gst_video_encoder_sink_query_default (GstVideoEncoder * encoder,
     GstQuery * query)
 {
-  GstVideoEncoder *encoder;
+  GstPad *pad = GST_VIDEO_ENCODER_SINK_PAD (encoder);
   gboolean res = FALSE;
 
-  encoder = GST_VIDEO_ENCODER (parent);
-
   switch (GST_QUERY_TYPE (query)) {
     case GST_QUERY_CAPS:
     {
@@ -841,12 +846,32 @@ gst_video_encoder_sink_query (GstPad * pad, GstObject * parent,
       break;
     }
     default:
-      res = gst_pad_query_default (pad, parent, query);
+      res = gst_pad_query_default (pad, GST_OBJECT (encoder), query);
       break;
   }
   return res;
 }
 
+static gboolean
+gst_video_encoder_sink_query (GstPad * pad, GstObject * parent,
+    GstQuery * query)
+{
+  GstVideoEncoder *encoder;
+  GstVideoEncoderClass *encoder_class;
+  gboolean ret = FALSE;
+
+  encoder = GST_VIDEO_ENCODER (parent);
+  encoder_class = GST_VIDEO_ENCODER_GET_CLASS (encoder);
+
+  GST_DEBUG_OBJECT (encoder, "received query %d, %s", GST_QUERY_TYPE (query),
+      GST_QUERY_TYPE_NAME (query));
+
+  if (encoder_class->sink_query)
+    ret = encoder_class->sink_query (encoder, query);
+
+  return ret;
+}
+
 static void
 gst_video_encoder_finalize (GObject * object)
 {
@@ -1141,13 +1166,12 @@ gst_video_encoder_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
 }
 
 static gboolean
-gst_video_encoder_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
+gst_video_encoder_src_query_default (GstVideoEncoder * enc, GstQuery * query)
 {
+  GstPad *pad = GST_VIDEO_ENCODER_SRC_PAD (enc);
   GstVideoEncoderPrivate *priv;
-  GstVideoEncoder *enc;
   gboolean res;
 
-  enc = GST_VIDEO_ENCODER (parent);
   priv = enc->priv;
 
   GST_LOG_OBJECT (enc, "handling query: %" GST_PTR_FORMAT, query);
@@ -1193,7 +1217,7 @@ gst_video_encoder_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
     }
       break;
     default:
-      res = gst_pad_query_default (pad, parent, query);
+      res = gst_pad_query_default (pad, GST_OBJECT (enc), query);
   }
   return res;
 
@@ -1202,6 +1226,25 @@ error:
   return res;
 }
 
+static gboolean
+gst_video_encoder_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
+{
+  GstVideoEncoder *encoder;
+  GstVideoEncoderClass *encoder_class;
+  gboolean ret = FALSE;
+
+  encoder = GST_VIDEO_ENCODER (parent);
+  encoder_class = GST_VIDEO_ENCODER_GET_CLASS (encoder);
+
+  GST_DEBUG_OBJECT (encoder, "received query %d, %s", GST_QUERY_TYPE (query),
+      GST_QUERY_TYPE_NAME (query));
+
+  if (encoder_class->src_query)
+    ret = encoder_class->src_query (encoder, query);
+
+  return ret;
+}
+
 static GstVideoCodecFrame *
 gst_video_encoder_new_frame (GstVideoEncoder * encoder, GstBuffer * buf,
     GstClockTime pts, GstClockTime dts, GstClockTime duration)

gst-libs/gst/video/gstvideoencoder.h

@@ -214,6 +214,16 @@ struct _GstVideoEncoder
  * @flush:              Optional.
  *                      Flush all remaining data from the encoder without
  *                      pushing it downstream. Since: 1.2
+ * @sink_query:     Optional.
+ *                  Query handler on the sink pad. This function should
+ *                  return TRUE if the query could be performed. Subclasses
+ *                  should chain up to the parent implementation to invoke the
+ *                  default handler. Since 1.4
+ * @src_query:      Optional.
+ *                  Query handler on the source pad. This function should
+ *                  return TRUE if the query could be performed. Subclasses
+ *                  should chain up to the parent implementation to invoke the
+ *                  default handler. Since 1.4
  *
  * Subclasses can override any of the available virtual methods or not, as
  * needed. At minimum @handle_frame needs to be overridden, and @set_format
@@ -265,8 +275,14 @@ struct _GstVideoEncoderClass
                                        GstQuery * query);
   gboolean      (*flush)              (GstVideoEncoder *encoder);
 
+  gboolean      (*sink_query)     (GstVideoEncoder *encoder,
+				   GstQuery *query);
+
+  gboolean      (*src_query)      (GstVideoEncoder *encoder,
+				   GstQuery *query);
+
   /*< private >*/
-  gpointer       _gst_reserved[GST_PADDING_LARGE-1];
+  gpointer       _gst_reserved[GST_PADDING_LARGE-3];
 };
 
 GType                gst_video_encoder_get_type (void);