*/
int ff_rotate_slice(SwsSlice *s, int lum, int chr);
+/// initializes gamma conversion descriptor
+int ff_init_gamma_convert(SwsFilterDescriptor *desc, SwsSlice * src, uint16_t *table);
+
/// initializes lum pixel format conversion descriptor
int ff_init_desc_fmt_convert(SwsFilterDescriptor *desc, SwsSlice * src, SwsSlice *dst, uint32_t *pal);