Implement avfilter_version().

Originally committed as revision 14669 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavfilter/avfilter.c

@@ -22,6 +22,10 @@
 #include "libavcodec/imgconvert.h"
 #include "avfilter.h"
 
+unsigned avfilter_version(void) {
+    return LIBAVFILTER_VERSION_INT;
+}
+
 /** list of registered filters */
 struct FilterList
 {

libavfilter/avfilter.h

@@ -23,7 +23,7 @@
 #define FFMPEG_AVFILTER_H
 
 #define LIBAVFILTER_VERSION_MAJOR  0
-#define LIBAVFILTER_VERSION_MINOR  0
+#define LIBAVFILTER_VERSION_MINOR  1
 #define LIBAVFILTER_VERSION_MICRO  0
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
@@ -37,6 +37,11 @@
 #include <stddef.h>
 #include "libavcodec/avcodec.h"
 
+/**
+ * Returns the LIBAVFILTER_VERSION_INT constant.
+ */
+unsigned avfilter_version(void);
+
 typedef struct AVFilterContext AVFilterContext;
 typedef struct AVFilterLink    AVFilterLink;
 typedef struct AVFilterPad     AVFilterPad;