From 296397a8b132c801c88ce4d51541c7093d63e6b0 Mon Sep 17 00:00:00 2001
From: Matthew Waters <matthew@centricular.com>
Date: Mon, 4 May 2015 23:42:36 +1000
Subject: [PATCH] glimagesink: handle the local_context query

so that upstream elements can get the GL context from glimagesink
---
 ext/gl/gstglimagesink.c | 34 +++++++++++++++++++++++++++++++---
 1 file changed, 31 insertions(+), 3 deletions(-)

diff --git a/ext/gl/gstglimagesink.c b/ext/gl/gstglimagesink.c
index a7de89fc30..674e30d5ef 100644
--- a/ext/gl/gstglimagesink.c
+++ b/ext/gl/gstglimagesink.c
@@ -597,12 +597,40 @@ gst_glimage_sink_query (GstBaseSink * bsink, GstQuery * query)
   switch (GST_QUERY_TYPE (query)) {
     case GST_QUERY_CONTEXT:
     {
-      gboolean ret =
-          gst_gl_handle_context_query ((GstElement *) glimage_sink, query,
+      const gchar *context_type;
+      GstContext *context, *old_context;
+
+      res = gst_gl_handle_context_query ((GstElement *) glimage_sink, query,
           &glimage_sink->display, &glimage_sink->other_context);
       if (glimage_sink->display)
         gst_gl_display_filter_gl_api (glimage_sink->display, SUPPORTED_GL_APIS);
-      return ret;
+
+      gst_query_parse_context_type (query, &context_type);
+
+      if (g_strcmp0 (context_type, "gst.gl.local_context") == 0) {
+        GstStructure *s;
+
+        gst_query_parse_context (query, &old_context);
+
+        if (old_context)
+          context = gst_context_copy (old_context);
+        else
+          context = gst_context_new ("gst.gl.local_context", FALSE);
+
+        s = gst_context_writable_structure (context);
+        gst_structure_set (s, "context", GST_GL_TYPE_CONTEXT,
+            glimage_sink->context, NULL);
+        gst_query_set_context (query, context);
+        gst_context_unref (context);
+
+        res = glimage_sink->context != NULL;
+      }
+      GST_LOG_OBJECT (glimage_sink, "context query of type %s %i", context_type,
+          res);
+
+      if (res)
+        return res;
+      break;
     }
     case GST_QUERY_DRAIN:
     {