Fix sws_scale const correctness for strict GCC

av/video/reformatter.pyx

@@ -157,8 +157,8 @@ cdef class VideoReformatter:
         # We want to change the colorspace/color_range transforms.
         # We do that by grabbing all of the current settings, changing a
         # couple, and setting them all. We need a lot of state here.
-        cdef const int *inv_tbl
-        cdef const int *tbl
+        cdef int *inv_tbl
+        cdef int *tbl
         cdef int src_colorspace_range, dst_colorspace_range
         cdef int brightness, contrast, saturation
         cdef int ret
@@ -209,7 +209,7 @@ cdef class VideoReformatter:
         with nogil:
             lib.sws_scale(
                 self.ptr,
-                frame.ptr.data,
+                <const uint8_t *const *>frame.ptr.data,
                 frame.ptr.linesize,
                 0,  # slice Y
                 frame.ptr.height,

include/libswscale/swscale.pxd

@@ -49,11 +49,11 @@ cdef extern from "libswscale/swscale.h" nogil:
 
     cdef int sws_scale(
         SwsContext *ctx,
-        unsigned char **src_slice,
-        int *src_stride,
+        const unsigned char *const *src_slice,
+        const int *src_stride,
         int src_slice_y,
         int src_slice_h,
-        unsigned char **dst_slice,
+        unsigned char *const *dst_slice,
         int *dst_stride,
     )