Add libavcore.

The new library is meant to contain the core multimedia utilities for
FFmpeg, to make them shareable between more libav* libraries.

See thread:
Subject: [FFmpeg-devel] [RFC] New library for shared non-generic libav* utils
Date: Fri, 9 Jul 2010 01:07:40 +0200

Originally committed as revision 24393 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcore/utils.c

@@ -0,0 +1,41 @@
+/*
+ * 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 "config.h"
+#include "avcore.h"
+
+/**
+ * @file
+ * various utility functions
+ */
+
+unsigned avcore_version(void)
+{
+    return LIBAVCORE_VERSION_INT;
+}
+
+const char *avcore_configuration(void)
+{
+    return FFMPEG_CONFIGURATION;
+}
+
+const char *avcore_license(void)
+{
+#define LICENSE_PREFIX "libavcore license: "
+    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
+}