From 65f935480360a55f8d1ec5211812c1e921d86666 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9=20Stadler?= <mail@renestadler.de>
Date: Sun, 16 Oct 2011 20:05:28 +0200
Subject: [PATCH] pngenc: ensure setcaps was called before chain function

This is needed to properly error out for e.g. "fakesrc ! pngenc ! fakesink".
---
 ext/libpng/gstpngenc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ext/libpng/gstpngenc.c b/ext/libpng/gstpngenc.c
index e59da9be08..7bad0377bd 100644
--- a/ext/libpng/gstpngenc.c
+++ b/ext/libpng/gstpngenc.c
@@ -271,6 +271,11 @@ gst_pngenc_chain (GstPad * pad, GstBuffer * buf)
 
   GST_DEBUG_OBJECT (pngenc, "BEGINNING");
 
+  if (G_UNLIKELY (pngenc->width <= 0 || pngenc->height <= 0)) {
+    ret = GST_FLOW_NOT_NEGOTIATED;
+    goto done;
+  }
+
   if (G_UNLIKELY (GST_BUFFER_SIZE (buf) < pngenc->height * pngenc->stride)) {
     gst_buffer_unref (buf);
     GST_ELEMENT_ERROR (pngenc, STREAM, FORMAT, (NULL),