File 0027-stridetransform-maintain-caps-order.patch of Package gst-plugins-base

From 4bb4d524f494fb9e2f05d5e202ab86795eb6fcf0 Mon Sep 17 00:00:00 2001
From: Alessandro Decina <alessandro.decina@collabora.co.uk>
Date: Thu, 18 Aug 2011 11:28:19 +0200
Subject: [PATCH] stridetransform: maintain caps order

transform yuv to yuv;yuv-strided and yuv-strided to yuv-strided;yuv.
Fixes some dynamic pipelines negotiating non-strided yuv for no good reason.
---
 gst/stride/gststridetransform.c |   26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/gst/stride/gststridetransform.c b/gst/stride/gststridetransform.c
index 7874ed4..b272500 100644
--- a/gst/stride/gststridetransform.c
+++ b/gst/stride/gststridetransform.c
@@ -479,6 +479,32 @@ gst_stride_transform_transform_caps (GstBaseTransform * base,
 
   gst_caps_do_simplify (ret);
 
+  /* do_simplify sorts caps in a way that yuv always comes before yuv-strided.
+   * If we're converting from yuv-strided we want to favor yuv-strided though,
+   * so we reverse the result.
+   */
+  if (!gst_caps_is_empty (caps)) {
+    GstCaps *tmp;
+    GstStructure *s;
+    const char *name;
+
+    s = gst_caps_get_structure (caps, 0);
+    name = gst_structure_get_name (s);
+
+    if (!strcmp (name, "video/x-raw-yuv-strided") ||
+          !strcmp (name, "video/x-raw-rgb-strided")) {
+      tmp = gst_caps_new_empty ();
+      
+      for (int i = gst_caps_get_size (ret) - 1; i >= 0; i--) {
+        gst_caps_append_structure (tmp,
+            gst_structure_copy (gst_caps_get_structure (ret, i)));
+      }
+
+      gst_caps_unref (ret);
+      ret = tmp;
+    }
+  }
+
   LOG_CAPS (self, ret);
 
   return ret;
-- 
1.7.9.5