hevcdsp: replace the SAOParams struct parameter from sao_band_filter

Pass instead the two variables from the struct needed in the function.
This simplifies writing asm optimized versions of the function

Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/hevc_filter.c

@@ -259,7 +259,8 @@ static void sao_filter_CTB(HEVCContext *s, int x, int y)
         case SAO_BAND:
             copy_CTB(dst, src, width << s->sps->pixel_shift, height, stride_dst, stride_src);
             s->hevcdsp.sao_band_filter(src, dst, stride_src, stride_dst,
-                                       sao, width, height, c_idx);
+                                       sao->offset_val[c_idx], sao->band_position[c_idx],
+                                       width, height);
             restore_tqb_pixels(s, x, y, width, height, c_idx);
             sao->type_idx[c_idx] = SAO_APPLIED;
             break;

libavcodec/hevcdsp.h

@@ -59,7 +59,7 @@ typedef struct HEVCDSPContext {
     void (*idct_dc[4])(int16_t *coeffs);
 
     void (*sao_band_filter)(uint8_t *_dst, uint8_t *_src, ptrdiff_t _stride_dst, ptrdiff_t _stride_src,
-                            struct SAOParams *sao, int width, int height, int c_idx);
+                            int16_t *sao_offset_val, int sao_left_class, int width, int height);
 
     void (*sao_edge_filter[2])(uint8_t *_dst, uint8_t *_src, ptrdiff_t _stride_dst, ptrdiff_t _stride_src,
                                struct SAOParams *sao, int *borders, int _width,

libavcodec/hevcdsp_template.c

@@ -302,16 +302,15 @@ IDCT_DC(32)
 #undef ADD_AND_SCALE
 
 static void FUNC(sao_band_filter_0)(uint8_t *_dst, uint8_t *_src,
-                                  ptrdiff_t stride_dst, ptrdiff_t stride_src, SAOParams *sao,
-                                  int width, int height, int c_idx)
+                                    ptrdiff_t stride_dst, ptrdiff_t stride_src,
+                                    int16_t *sao_offset_val, int sao_left_class,
+                                    int width, int height)
 {
     pixel *dst = (pixel *)_dst;
     pixel *src = (pixel *)_src;
     int offset_table[32] = { 0 };
     int k, y, x;
     int shift  = BIT_DEPTH - 5;
-    int16_t *sao_offset_val = sao->offset_val[c_idx];
-    int sao_left_class  = sao->band_position[c_idx];
 
     stride_dst /= sizeof(pixel);
     stride_src /= sizeof(pixel);