From: David Schleef <ds@schleef.org>
Date: Fri, 12 Apr 2013 21:07:31 +0000 (-0700)
Subject: element-templates: Add helper code to transform_caps
X-Git-Tag: 1.19.3~507^2~13829
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=12a4ff1100db8e8e27a7890b0791e930c05684bb;p=platform%2Fupstream%2Fgstreamer.git

element-templates: Add helper code to transform_caps
---

diff --git a/tools/element-templates/basetransform b/tools/element-templates/basetransform
index 24217964d8..0be449ca22 100644
--- a/tools/element-templates/basetransform
+++ b/tools/element-templates/basetransform
@@ -79,10 +79,32 @@ gst_replace_transform_caps (GstBaseTransform * trans, GstPadDirection direction,
     GstCaps * caps, GstCaps * filter)
 {
   GstReplace *replace = GST_REPLACE (trans);
+  GstCaps *othercaps;
 
   GST_DEBUG_OBJECT (replace, "transform_caps");
 
-  return NULL;
+  othercaps = gst_caps_copy (caps);
+
+  /* Copy other caps and modify as appropriate */
+  /* This works for the simplest cases, where the transform modifies one
+   * or more fields in the caps structure.  It does not work correctly
+   * if passthrough caps are preferred. */
+  if (direction == GST_PAD_SRC) {
+    /* transform caps going upstream */
+  } else {
+    /* transform caps going downstream */
+  }
+
+  if (filter) {
+    GstCaps *intersect;
+
+    intersect = gst_caps_intersect (othercaps, filter);
+    gst_caps_unref (othercaps);
+
+    return intersect;
+  } else {
+    return othercaps;
+  }
 }
 
 static GstCaps *