mpegvideo: move ff_draw_horiz_band() to mpegutils.c

Drop the mpegvideo dependency for svq3 in configure.

libavcodec/mpegutils.h

@@ -21,8 +21,14 @@
 #ifndef AVCODEC_MPEGUTILS_H
 #define AVCODEC_MPEGUTILS_H
 
+#include <stdint.h>
+
+#include "libavutil/frame.h"
+
+#include "avcodec.h"
 #include "version.h"
 
+
 /* picture type */
 #define PICT_TOP_FIELD     1
 #define PICT_BOTTOM_FIELD  2
@@ -108,4 +114,14 @@
 
 #define CANDIDATE_MB_TYPE_DIRECT0    (1 << 12)
 
+
+/**
+ * Draw a horizontal band if supported.
+ *
+ * @param h is the normal height, this will be reduced automatically if needed
+ */
+void ff_draw_horiz_band(AVCodecContext *avctx, AVFrame *cur, AVFrame *last,
+                        int y, int h, int picture_structure, int first_field,
+                        int low_delay);
+
 #endif /* AVCODEC_PICTTYPE_H */