glmixer: override the accept caps query in order to 'convert' capsfeatures

Otherwise, it is only possible for the sink pads and the src pads to
have the exact same caps features.  We can convert from any feature
to another feature so support that.

diff --git a/ext/gl/gstglmixer.c b/ext/gl/gstglmixer.c
index 743bacc..da6ba67 100644 (file)
--- a/ext/gl/gstglmixer.c
+++ b/ext/gl/gstglmixer.c
@@ -268,6 +268,26 @@ context_error:
 }
 
 static gboolean
+gst_gl_mixer_pad_sink_acceptcaps (GstPad * pad, GstGLMixer * mix,
+    GstCaps * caps)
+{
+  gboolean ret;
+  GstCaps *template_caps;
+
+  GST_DEBUG_OBJECT (pad, "try accept caps of %" GST_PTR_FORMAT, caps);
+
+  template_caps = gst_pad_get_pad_template_caps (pad);
+  template_caps = gst_caps_make_writable (template_caps);
+
+  ret = gst_caps_can_intersect (caps, template_caps);
+  GST_DEBUG_OBJECT (pad, "%saccepted caps %" GST_PTR_FORMAT,
+      (ret ? "" : "not "), caps);
+  gst_caps_unref (template_caps);
+
+  return ret;
+}
+
+static gboolean
 gst_gl_mixer_sink_query (GstAggregator * agg, GstAggregatorPad * bpad,
     GstQuery * query)
 {
@@ -277,6 +297,16 @@ gst_gl_mixer_sink_query (GstAggregator * agg, GstAggregatorPad * bpad,
   GST_TRACE ("QUERY %" GST_PTR_FORMAT, query);
 
   switch (GST_QUERY_TYPE (query)) {
+    case GST_QUERY_ACCEPT_CAPS:
+    {
+      GstCaps *caps;
+
+      gst_query_parse_accept_caps (query, &caps);
+      ret = gst_gl_mixer_pad_sink_acceptcaps (GST_PAD (bpad), mix, caps);
+      gst_query_set_accept_caps_result (query, ret);
+      ret = TRUE;
+      break;
+    }
     case GST_QUERY_ALLOCATION:
     {
       GstQuery *decide_query = NULL;