hevcdsp: remove an unneeded variable in the loop filter

beta0 and beta1 will always be the same

libavcodec/hevc_filter.c

@@ -339,7 +339,7 @@ static void deblocking_filter_CTB(HEVCContext *s, int x0, int y0)
 {
     uint8_t *src;
     int x, y, x_end, y_end, chroma;
-    int c_tc[2], beta[2], tc[2];
+    int c_tc[2], tc[2], beta;
     uint8_t no_p[2] = { 0 };
     uint8_t no_q[2] = { 0 };
 
@@ -375,13 +375,12 @@ static void deblocking_filter_CTB(HEVCContext *s, int x0, int y0)
             const int bs0 = s->vertical_bs[(x >> 3) + (y       >> 2) * s->bs_width];
             const int bs1 = s->vertical_bs[(x >> 3) + ((y + 4) >> 2) * s->bs_width];
             if (bs0 || bs1) {
-                const int qp0 = (get_qPy(s, x - 1, y)     + get_qPy(s, x, y)     + 1) >> 1;
-                const int qp1 = (get_qPy(s, x - 1, y + 4) + get_qPy(s, x, y + 4) + 1) >> 1;
+                const int qp = (get_qPy(s, x - 1, y)     + get_qPy(s, x, y)     + 1) >> 1;
+
+                beta = betatable[av_clip(qp + beta_offset, 0, MAX_QP)];
 
-                beta[0] = betatable[av_clip(qp0 + beta_offset, 0, MAX_QP)];
-                beta[1] = betatable[av_clip(qp1 + beta_offset, 0, MAX_QP)];
-                tc[0]   = bs0 ? TC_CALC(qp0, bs0) : 0;
-                tc[1]   = bs1 ? TC_CALC(qp1, bs1) : 0;
+                tc[0]   = bs0 ? TC_CALC(qp, bs0) : 0;
+                tc[1]   = bs1 ? TC_CALC(qp, bs1) : 0;
                 src     = &s->frame->data[LUMA][y * s->frame->linesize[LUMA] + (x << s->sps->pixel_shift)];
                 if (pcmf) {
                     no_p[0] = get_pcm(s, x - 1, y);
@@ -437,16 +436,14 @@ static void deblocking_filter_CTB(HEVCContext *s, int x0, int y0)
             const int bs0 = s->horizontal_bs[(x +     y * s->bs_width) >> 2];
             const int bs1 = s->horizontal_bs[(x + 4 + y * s->bs_width) >> 2];
             if (bs0 || bs1) {
-                const int qp0 = (get_qPy(s, x, y - 1)     + get_qPy(s, x, y)     + 1) >> 1;
-                const int qp1 = (get_qPy(s, x + 4, y - 1) + get_qPy(s, x + 4, y) + 1) >> 1;
+                const int qp = (get_qPy(s, x, y - 1)     + get_qPy(s, x, y)     + 1) >> 1;
 
                 tc_offset   = x >= x0 ? cur_tc_offset : left_tc_offset;
                 beta_offset = x >= x0 ? cur_beta_offset : left_beta_offset;
 
-                beta[0] = betatable[av_clip(qp0 + beta_offset, 0, MAX_QP)];
-                beta[1] = betatable[av_clip(qp1 + beta_offset, 0, MAX_QP)];
-                tc[0]   = bs0 ? TC_CALC(qp0, bs0) : 0;
-                tc[1]   = bs1 ? TC_CALC(qp1, bs1) : 0;
+                beta = betatable[av_clip(qp + beta_offset, 0, MAX_QP)];
+                tc[0]   = bs0 ? TC_CALC(qp, bs0) : 0;
+                tc[1]   = bs1 ? TC_CALC(qp, bs1) : 0;
                 src     = &s->frame->data[LUMA][y * s->frame->linesize[LUMA] + (x << s->sps->pixel_shift)];
                 if (pcmf) {
                     no_p[0] = get_pcm(s, x, y - 1);

libavcodec/hevcdsp.h

@@ -79,20 +79,20 @@ typedef struct HEVCDSPContext {
                               ptrdiff_t srcstride, int width, int height);
 
     void (*hevc_h_loop_filter_luma)(uint8_t *pix, ptrdiff_t stride,
-                                    int *beta, int *tc,
+                                    int beta, int *tc,
                                     uint8_t *no_p, uint8_t *no_q);
     void (*hevc_v_loop_filter_luma)(uint8_t *pix, ptrdiff_t stride,
-                                    int *beta, int *tc,
+                                    int beta, int *tc,
                                     uint8_t *no_p, uint8_t *no_q);
     void (*hevc_h_loop_filter_chroma)(uint8_t *pix, ptrdiff_t stride,
                                       int *tc, uint8_t *no_p, uint8_t *no_q);
     void (*hevc_v_loop_filter_chroma)(uint8_t *pix, ptrdiff_t stride,
                                       int *tc, uint8_t *no_p, uint8_t *no_q);
     void (*hevc_h_loop_filter_luma_c)(uint8_t *pix, ptrdiff_t stride,
-                                      int *beta, int *tc,
+                                      int beta, int *tc,
                                       uint8_t *no_p, uint8_t *no_q);
     void (*hevc_v_loop_filter_luma_c)(uint8_t *pix, ptrdiff_t stride,
-                                      int *beta, int *tc,
+                                      int beta, int *tc,
                                       uint8_t *no_p, uint8_t *no_q);
     void (*hevc_h_loop_filter_chroma_c)(uint8_t *pix, ptrdiff_t stride,
                                         int *tc, uint8_t *no_p,

libavcodec/hevcdsp_template.c

@@ -1164,7 +1164,7 @@ static void FUNC(weighted_pred_avg)(uint8_t denom,
 
 static void FUNC(hevc_loop_filter_luma)(uint8_t *_pix,
                                         ptrdiff_t _xstride, ptrdiff_t _ystride,
-                                        int *_beta, int *_tc,
+                                        int beta, int *_tc,
                                         uint8_t *_no_p, uint8_t *_no_q)
 {
     int d, j;
@@ -1172,6 +1172,8 @@ static void FUNC(hevc_loop_filter_luma)(uint8_t *_pix,
     ptrdiff_t xstride = _xstride / sizeof(pixel);
     ptrdiff_t ystride = _ystride / sizeof(pixel);
 
+    beta <<= BIT_DEPTH - 8;
+
     for (j = 0; j < 2; j++) {
         const int dp0  = abs(P2  - 2 * P1  + P0);
         const int dq0  = abs(Q2  - 2 * Q1  + Q0);
@@ -1179,7 +1181,6 @@ static void FUNC(hevc_loop_filter_luma)(uint8_t *_pix,
         const int dq3  = abs(TQ2 - 2 * TQ1 + TQ0);
         const int d0   = dp0 + dq0;
         const int d3   = dp3 + dq3;
-        const int beta = _beta[j] << (BIT_DEPTH - 8);
         const int tc   = _tc[j]   << (BIT_DEPTH - 8);
         const int no_p = _no_p[j];
         const int no_q = _no_q[j];
@@ -1306,7 +1307,7 @@ static void FUNC(hevc_v_loop_filter_chroma)(uint8_t *pix, ptrdiff_t stride,
 }
 
 static void FUNC(hevc_h_loop_filter_luma)(uint8_t *pix, ptrdiff_t stride,
-                                          int *beta, int *tc, uint8_t *no_p,
+                                          int beta, int *tc, uint8_t *no_p,
                                           uint8_t *no_q)
 {
     FUNC(hevc_loop_filter_luma)(pix, stride, sizeof(pixel),
@@ -1314,7 +1315,7 @@ static void FUNC(hevc_h_loop_filter_luma)(uint8_t *pix, ptrdiff_t stride,
 }
 
 static void FUNC(hevc_v_loop_filter_luma)(uint8_t *pix, ptrdiff_t stride,
-                                          int *beta, int *tc, uint8_t *no_p,
+                                          int beta, int *tc, uint8_t *no_p,
                                           uint8_t *no_q)
 {
     FUNC(hevc_loop_filter_luma)(pix, sizeof(pixel), stride,