Make const prototypes for input sources of sws_scale_* stricter.

Patch by Alexis Ballier gmailify($firstname, $familyname)

Originally committed as revision 30374 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

libswscale/swscale.c

@@ -2926,7 +2926,7 @@ static void reset_ptr(const uint8_t* src[], int format)
  * swscale wrapper, so we don't need to export the SwsContext.
  * Assumes planar YUV to be in YUV order instead of YVU.
  */
-int sws_scale(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
+int sws_scale(SwsContext *c, const uint8_t* const src[], int srcStride[], int srcSliceY,
               int srcSliceH, uint8_t* dst[], int dstStride[])
 {
     int i;
@@ -3046,7 +3046,7 @@ int sws_scale(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSlice
 }
 
 #if LIBSWSCALE_VERSION_MAJOR < 1
-int sws_scale_ordered(SwsContext *c, const uint8_t* src[], int srcStride[], int srcSliceY,
+int sws_scale_ordered(SwsContext *c, const uint8_t* const src[], int srcStride[], int srcSliceY,
                       int srcSliceH, uint8_t* dst[], int dstStride[])
 {
     return sws_scale(c, src, srcStride, srcSliceY, srcSliceH, dst, dstStride);

libswscale/swscale.h

@@ -184,13 +184,13 @@ struct SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat
  *                  the destination image
  * @return          the height of the output slice
  */
-int sws_scale(struct SwsContext *context, const uint8_t* srcSlice[], int srcStride[],
+int sws_scale(struct SwsContext *context, const uint8_t* const srcSlice[], int srcStride[],
               int srcSliceY, int srcSliceH, uint8_t* dst[], int dstStride[]);
 #if LIBSWSCALE_VERSION_MAJOR < 1
 /**
  * @deprecated Use sws_scale() instead.
  */
-int sws_scale_ordered(struct SwsContext *context, const uint8_t* src[],
+int sws_scale_ordered(struct SwsContext *context, const uint8_t* const src[],
                       int srcStride[], int srcSliceY, int srcSliceH,
                       uint8_t* dst[], int dstStride[]) attribute_deprecated;
 #endif