Merge commit '9e500efdbe0deeff1602500ebc229a0a6b6bb1a2'

* commit '9e500efdbe0deeff1602500ebc229a0a6b6bb1a2':
  Add av_image_check_sar() and use it to validate SAR

Conflicts:
	libavcodec/dpx.c
	libavcodec/dvdec.c
	libavcodec/ffv1dec.c
	libavcodec/utils.c
	libavutil/version.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/internal.h

@@ -240,6 +240,12 @@ const uint8_t *avpriv_find_start_code(const uint8_t *p,
  */
 int ff_set_dimensions(AVCodecContext *s, int width, int height);
 
+/**
+ * Check that the provided sample aspect ratio is valid and set it on the codec
+ * context.
+ */
+int ff_set_sar(AVCodecContext *avctx, AVRational sar);
+
 /**
  * Add or update AV_FRAME_DATA_MATRIXENCODING side data.
  */