Add last file of main filter framework

Originally committed as revision 12076 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavfilter/allfilters.c

+/*
+ * filter registration
+ * copyright (c) 2008 Vitor Sessak
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avfilter.h"
+
+#define REGISTER_VF(X,x) { \
+          extern AVFilter avfilter_vf_##x ; \
+          if(ENABLE_VF_##X )  avfilter_register(&avfilter_vf_##x ); }
+
+
+#define REGISTER_VSRC(X,x) { \
+          extern AVFilter avfilter_vsrc_##x ; \
+          if(ENABLE_VSRC_##X )  avfilter_register(&avfilter_vsrc_##x ); }
+
+void avfilter_register_all(void)
+{
+    static int initialized;
+
+    if (initialized)
+        return;
+    initialized = 1;
+
+//    REGISTER_VF(CROP,crop);
+
+}