/*

  * HEVC video decoder

  *
  * Copyright (C) 2012 - 2013 Guillaume Martres
  * Copyright (C) 2013 Seppo Tomperi
  * Copyright (C) 2013 Wassim Hamidouche
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "libavutil/common.h"
 #include "libavutil/internal.h"
 
 #include "cabac_functions.h"

 #include "hevcdec.h"

 #include "bit_depth_template.c"
 
 #define LUMA 0
 #define CB 1
 #define CR 2
 
 static const uint8_t tctable[54] = {

     0, 0, 0, 0, 0, 0, 0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 0, 0, 1, // QP  0...18
     1, 1, 1, 1, 1, 1, 1,  1,  2,  2,  2,  2,  3,  3,  3,  3, 4, 4, 4, // QP 19...37
     5, 5, 6, 6, 7, 8, 9, 10, 11, 13, 14, 16, 18, 20, 22, 24           // QP 38...53

 };
 
 static const uint8_t betatable[52] = {

      0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  6,  7,  8, // QP 0...18
      9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, // QP 19...37
     38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64                      // QP 38...51

 };
 
 static int chroma_tc(HEVCContext *s, int qp_y, int c_idx, int tc_offset)
 {

     static const int qp_c[] = {
         29, 30, 31, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37
     };

     int qp, qp_i, offset, idxt;

 
     // slice qp offset is not used for deblocking
     if (c_idx == 1)

         offset = s->ps.pps->cb_qp_offset;

     else

         offset = s->ps.pps->cr_qp_offset;

     qp_i = av_clip(qp_y + offset, 0, 57);

     if (s->ps.sps->chroma_format_idc == 1) {

         if (qp_i < 30)
             qp = qp_i;
         else if (qp_i > 43)
             qp = qp_i - 6;
         else
             qp = qp_c[qp_i - 30];
     } else {
         qp = av_clip(qp_i, 0, 51);
     }

     idxt = av_clip(qp + DEFAULT_INTRA_TC_OFFSET + tc_offset, 0, 53);

     return tctable[idxt];
 }
 

 static int get_qPy_pred(HEVCContext *s, int xBase, int yBase, int log2_cb_size)

 {

     HEVCLocalContext *lc     = s->HEVClc;

     int ctb_size_mask        = (1 << s->ps.sps->log2_ctb_size) - 1;
     int MinCuQpDeltaSizeMask = (1 << (s->ps.sps->log2_ctb_size -
                                       s->ps.pps->diff_cu_qp_delta_depth)) - 1;

     int xQgBase              = xBase - (xBase & MinCuQpDeltaSizeMask);
     int yQgBase              = yBase - (yBase & MinCuQpDeltaSizeMask);

     int min_cb_width         = s->ps.sps->min_cb_width;
     int x_cb                 = xQgBase >> s->ps.sps->log2_min_cb_size;
     int y_cb                 = yQgBase >> s->ps.sps->log2_min_cb_size;

     int availableA           = (xBase   & ctb_size_mask) &&
                                (xQgBase & ctb_size_mask);
     int availableB           = (yBase   & ctb_size_mask) &&
                                (yQgBase & ctb_size_mask);

     int qPy_pred, qPy_a, qPy_b;

 
     // qPy_pred

     if (lc->first_qp_group || (!xQgBase && !yQgBase)) {

         lc->first_qp_group = !lc->tu.is_cu_qp_delta_coded;
         qPy_pred = s->sh.slice_qp;
     } else {

         qPy_pred = lc->qPy_pred;

     }
 
     // qPy_a
     if (availableA == 0)
         qPy_a = qPy_pred;
     else

         qPy_a = s->qp_y_tab[(x_cb - 1) + y_cb * min_cb_width];

 
     // qPy_b
     if (availableB == 0)
         qPy_b = qPy_pred;
     else

         qPy_b = s->qp_y_tab[x_cb + (y_cb - 1) * min_cb_width];

     av_assert2(qPy_a >= -s->ps.sps->qp_bd_offset && qPy_a < 52);
     av_assert2(qPy_b >= -s->ps.sps->qp_bd_offset && qPy_b < 52);

     return (qPy_a + qPy_b + 1) >> 1;
 }
 

 void ff_hevc_set_qPy(HEVCContext *s, int xBase, int yBase, int log2_cb_size)

 {

     int qp_y = get_qPy_pred(s, xBase, yBase, log2_cb_size);

     if (s->HEVClc->tu.cu_qp_delta != 0) {

         int off = s->ps.sps->qp_bd_offset;

         s->HEVClc->qp_y = FFUMOD(qp_y + s->HEVClc->tu.cu_qp_delta + 52 + 2 * off,
                                  52 + off) - off;

     } else

         s->HEVClc->qp_y = qp_y;

 }
 
 static int get_qPy(HEVCContext *s, int xC, int yC)
 {

     int log2_min_cb_size  = s->ps.sps->log2_min_cb_size;

     int x                 = xC >> log2_min_cb_size;
     int y                 = yC >> log2_min_cb_size;

     return s->qp_y_tab[x + y * s->ps.sps->min_cb_width];

 }
 

 static void copy_CTB(uint8_t *dst, const uint8_t *src, int width, int height,

                      ptrdiff_t stride_dst, ptrdiff_t stride_src)

 {

 int i, j;
 
     if (((intptr_t)dst | (intptr_t)src | stride_dst | stride_src) & 15) {
         for (i = 0; i < height; i++) {
             for (j = 0; j < width; j+=8)

                 AV_COPY64U(dst+j, src+j);

             dst += stride_dst;
             src += stride_src;
         }
     } else {
         for (i = 0; i < height; i++) {
             for (j = 0; j < width; j+=16)
                 AV_COPY128(dst+j, src+j);
             dst += stride_dst;
             src += stride_src;
         }

     }
 }
 

 static void copy_pixel(uint8_t *dst, const uint8_t *src, int pixel_shift)
 {
     if (pixel_shift)
         *(uint16_t *)dst = *(uint16_t *)src;
     else
         *dst = *src;
 }
 
 static void copy_vert(uint8_t *dst, const uint8_t *src,
                       int pixel_shift, int height,

                       ptrdiff_t stride_dst, ptrdiff_t stride_src)

 {
     int i;
     if (pixel_shift == 0) {
         for (i = 0; i < height; i++) {
             *dst = *src;
             dst += stride_dst;
             src += stride_src;
         }
     } else {
         for (i = 0; i < height; i++) {
             *(uint16_t *)dst = *(uint16_t *)src;
             dst += stride_dst;
             src += stride_src;
         }
     }
 }
 
 static void copy_CTB_to_hv(HEVCContext *s, const uint8_t *src,

                            ptrdiff_t stride_src, int x, int y, int width, int height,

                            int c_idx, int x_ctb, int y_ctb)
 {

     int sh = s->ps.sps->pixel_shift;
     int w = s->ps.sps->width >> s->ps.sps->hshift[c_idx];
     int h = s->ps.sps->height >> s->ps.sps->vshift[c_idx];

 
     /* copy horizontal edges */
     memcpy(s->sao_pixel_buffer_h[c_idx] + (((2 * y_ctb) * w + x) << sh),
         src, width << sh);
     memcpy(s->sao_pixel_buffer_h[c_idx] + (((2 * y_ctb + 1) * w + x) << sh),
         src + stride_src * (height - 1), width << sh);
 
     /* copy vertical edges */
     copy_vert(s->sao_pixel_buffer_v[c_idx] + (((2 * x_ctb) * h + y) << sh), src, sh, height, 1 << sh, stride_src);
 
     copy_vert(s->sao_pixel_buffer_v[c_idx] + (((2 * x_ctb + 1) * h + y) << sh), src + ((width - 1) << sh), sh, height, 1 << sh, stride_src);
 }
 
 static void restore_tqb_pixels(HEVCContext *s,
                                uint8_t *src1, const uint8_t *dst1,
                                ptrdiff_t stride_src, ptrdiff_t stride_dst,
                                int x0, int y0, int width, int height, int c_idx)

 {

     if ( s->ps.pps->transquant_bypass_enable_flag ||
             (s->ps.sps->pcm.loop_filter_disable_flag && s->ps.sps->pcm_enabled_flag)) {

         int x, y;

         int min_pu_size  = 1 << s->ps.sps->log2_min_pu_size;
         int hshift       = s->ps.sps->hshift[c_idx];
         int vshift       = s->ps.sps->vshift[c_idx];
         int x_min        = ((x0         ) >> s->ps.sps->log2_min_pu_size);
         int y_min        = ((y0         ) >> s->ps.sps->log2_min_pu_size);
         int x_max        = ((x0 + width ) >> s->ps.sps->log2_min_pu_size);
         int y_max        = ((y0 + height) >> s->ps.sps->log2_min_pu_size);
         int len          = (min_pu_size >> hshift) << s->ps.sps->pixel_shift;

         for (y = y_min; y < y_max; y++) {
             for (x = x_min; x < x_max; x++) {

                 if (s->is_pcm[y * s->ps.sps->min_pu_width + x]) {

                     int n;

                     uint8_t *src = src1 + (((y << s->ps.sps->log2_min_pu_size) - y0) >> vshift) * stride_src + ((((x << s->ps.sps->log2_min_pu_size) - x0) >> hshift) << s->ps.sps->pixel_shift);
                     const uint8_t *dst = dst1 + (((y << s->ps.sps->log2_min_pu_size) - y0) >> vshift) * stride_dst + ((((x << s->ps.sps->log2_min_pu_size) - x0) >> hshift) << s->ps.sps->pixel_shift);

                     for (n = 0; n < (min_pu_size >> vshift); n++) {

                         memcpy(src, dst, len);

                         src += stride_src;
                         dst += stride_dst;

                     }
                 }
             }
         }
     }
 }
 

 #define CTB(tab, x, y) ((tab)[(y) * s->ps.sps->ctb_width + (x)])

 static void sao_filter_CTB(HEVCContext *s, int x, int y)

 {

     static const uint8_t sao_tab[8] = { 0, 1, 2, 2, 3, 3, 4, 4 };

     HEVCLocalContext *lc = s->HEVClc;

     int c_idx;

     int edges[4];  // 0 left 1 top 2 right 3 bottom

     int x_ctb                = x >> s->ps.sps->log2_ctb_size;
     int y_ctb                = y >> s->ps.sps->log2_ctb_size;
     int ctb_addr_rs          = y_ctb * s->ps.sps->ctb_width + x_ctb;
     int ctb_addr_ts          = s->ps.pps->ctb_addr_rs_to_ts[ctb_addr_rs];

     SAOParams *sao           = &CTB(s->sao, x_ctb, y_ctb);

     // flags indicating unfilterable edges

     uint8_t vert_edge[]      = { 0, 0 };
     uint8_t horiz_edge[]     = { 0, 0 };
     uint8_t diag_edge[]      = { 0, 0, 0, 0 };
     uint8_t lfase            = CTB(s->filter_slice_edges, x_ctb, y_ctb);

     uint8_t no_tile_filter   = s->ps.pps->tiles_enabled_flag &&
                                !s->ps.pps->loop_filter_across_tiles_enabled_flag;

     uint8_t restore          = no_tile_filter || !lfase;
     uint8_t left_tile_edge   = 0;
     uint8_t right_tile_edge  = 0;
     uint8_t up_tile_edge     = 0;
     uint8_t bottom_tile_edge = 0;
 

     edges[0]   = x_ctb == 0;
     edges[1]   = y_ctb == 0;

     edges[2]   = x_ctb == s->ps.sps->ctb_width  - 1;
     edges[3]   = y_ctb == s->ps.sps->ctb_height - 1;

     if (restore) {

         if (!edges[0]) {

             left_tile_edge  = no_tile_filter && s->ps.pps->tile_id[ctb_addr_ts] != s->ps.pps->tile_id[s->ps.pps->ctb_addr_rs_to_ts[ctb_addr_rs-1]];

             vert_edge[0]    = (!lfase && CTB(s->tab_slice_address, x_ctb, y_ctb) != CTB(s->tab_slice_address, x_ctb - 1, y_ctb)) || left_tile_edge;
         }
         if (!edges[2]) {

             right_tile_edge = no_tile_filter && s->ps.pps->tile_id[ctb_addr_ts] != s->ps.pps->tile_id[s->ps.pps->ctb_addr_rs_to_ts[ctb_addr_rs+1]];

             vert_edge[1]    = (!lfase && CTB(s->tab_slice_address, x_ctb, y_ctb) != CTB(s->tab_slice_address, x_ctb + 1, y_ctb)) || right_tile_edge;
         }
         if (!edges[1]) {

             up_tile_edge     = no_tile_filter && s->ps.pps->tile_id[ctb_addr_ts] != s->ps.pps->tile_id[s->ps.pps->ctb_addr_rs_to_ts[ctb_addr_rs - s->ps.sps->ctb_width]];

             horiz_edge[0]    = (!lfase && CTB(s->tab_slice_address, x_ctb, y_ctb) != CTB(s->tab_slice_address, x_ctb, y_ctb - 1)) || up_tile_edge;
         }
         if (!edges[3]) {

             bottom_tile_edge = no_tile_filter && s->ps.pps->tile_id[ctb_addr_ts] != s->ps.pps->tile_id[s->ps.pps->ctb_addr_rs_to_ts[ctb_addr_rs + s->ps.sps->ctb_width]];

             horiz_edge[1]    = (!lfase && CTB(s->tab_slice_address, x_ctb, y_ctb) != CTB(s->tab_slice_address, x_ctb, y_ctb + 1)) || bottom_tile_edge;
         }
         if (!edges[0] && !edges[1]) {
             diag_edge[0] = (!lfase && CTB(s->tab_slice_address, x_ctb, y_ctb) != CTB(s->tab_slice_address, x_ctb - 1, y_ctb - 1)) || left_tile_edge || up_tile_edge;
         }
         if (!edges[1] && !edges[2]) {
             diag_edge[1] = (!lfase && CTB(s->tab_slice_address, x_ctb, y_ctb) != CTB(s->tab_slice_address, x_ctb + 1, y_ctb - 1)) || right_tile_edge || up_tile_edge;
         }
         if (!edges[2] && !edges[3]) {
             diag_edge[2] = (!lfase && CTB(s->tab_slice_address, x_ctb, y_ctb) != CTB(s->tab_slice_address, x_ctb + 1, y_ctb + 1)) || right_tile_edge || bottom_tile_edge;
         }
         if (!edges[0] && !edges[3]) {
             diag_edge[3] = (!lfase && CTB(s->tab_slice_address, x_ctb, y_ctb) != CTB(s->tab_slice_address, x_ctb - 1, y_ctb + 1)) || left_tile_edge || bottom_tile_edge;

         }
     }
 

     for (c_idx = 0; c_idx < (s->ps.sps->chroma_format_idc ? 3 : 1); c_idx++) {
         int x0       = x >> s->ps.sps->hshift[c_idx];
         int y0       = y >> s->ps.sps->vshift[c_idx];

         ptrdiff_t stride_src = s->frame->linesize[c_idx];

         int ctb_size_h = (1 << (s->ps.sps->log2_ctb_size)) >> s->ps.sps->hshift[c_idx];
         int ctb_size_v = (1 << (s->ps.sps->log2_ctb_size)) >> s->ps.sps->vshift[c_idx];
         int width    = FFMIN(ctb_size_h, (s->ps.sps->width  >> s->ps.sps->hshift[c_idx]) - x0);
         int height   = FFMIN(ctb_size_v, (s->ps.sps->height >> s->ps.sps->vshift[c_idx]) - y0);

         int tab      = sao_tab[(FFALIGN(width, 8) >> 3) - 1];

         uint8_t *src = &s->frame->data[c_idx][y0 * stride_src + (x0 << s->ps.sps->pixel_shift)];

         ptrdiff_t stride_dst;

         uint8_t *dst;

 
         switch (sao->type_idx[c_idx]) {
         case SAO_BAND:

             copy_CTB_to_hv(s, src, stride_src, x0, y0, width, height, c_idx,
                            x_ctb, y_ctb);

             if (s->ps.pps->transquant_bypass_enable_flag ||
                 (s->ps.sps->pcm.loop_filter_disable_flag && s->ps.sps->pcm_enabled_flag)) {

             dst = lc->edge_emu_buffer;
             stride_dst = 2*MAX_PB_SIZE;

             copy_CTB(dst, src, width << s->ps.sps->pixel_shift, height, stride_dst, stride_src);

             s->hevcdsp.sao_band_filter[tab](src, dst, stride_src, stride_dst,
                                             sao->offset_val[c_idx], sao->band_position[c_idx],
                                             width, height);

             restore_tqb_pixels(s, src, dst, stride_src, stride_dst,
                                x, y, width, height, c_idx);

             } else {
             s->hevcdsp.sao_band_filter[tab](src, src, stride_src, stride_src,
                                             sao->offset_val[c_idx], sao->band_position[c_idx],
                                             width, height);
             }

             sao->type_idx[c_idx] = SAO_APPLIED;

             break;
         case SAO_EDGE:

         {

             int w = s->ps.sps->width >> s->ps.sps->hshift[c_idx];
             int h = s->ps.sps->height >> s->ps.sps->vshift[c_idx];

             int left_edge = edges[0];
             int top_edge = edges[1];
             int right_edge = edges[2];
             int bottom_edge = edges[3];

             int sh = s->ps.sps->pixel_shift;

             int left_pixels, right_pixels;
 

             stride_dst = 2*MAX_PB_SIZE + AV_INPUT_BUFFER_PADDING_SIZE;
             dst = lc->edge_emu_buffer + stride_dst + AV_INPUT_BUFFER_PADDING_SIZE;

             if (!top_edge) {
                 int left = 1 - left_edge;
                 int right = 1 - right_edge;
                 const uint8_t *src1[2];
                 uint8_t *dst1;
                 int src_idx, pos;
 
                 dst1 = dst - stride_dst - (left << sh);
                 src1[0] = src - stride_src - (left << sh);
                 src1[1] = s->sao_pixel_buffer_h[c_idx] + (((2 * y_ctb - 1) * w + x0 - left) << sh);
                 pos = 0;
                 if (left) {
                     src_idx = (CTB(s->sao, x_ctb-1, y_ctb-1).type_idx[c_idx] ==
                                SAO_APPLIED);
                     copy_pixel(dst1, src1[src_idx], sh);
                     pos += (1 << sh);
                 }
                 src_idx = (CTB(s->sao, x_ctb, y_ctb-1).type_idx[c_idx] ==
                            SAO_APPLIED);
                 memcpy(dst1 + pos, src1[src_idx] + pos, width << sh);
                 if (right) {
                     pos += width << sh;
                     src_idx = (CTB(s->sao, x_ctb+1, y_ctb-1).type_idx[c_idx] ==
                                SAO_APPLIED);
                     copy_pixel(dst1 + pos, src1[src_idx] + pos, sh);
                 }
             }
             if (!bottom_edge) {
                 int left = 1 - left_edge;
                 int right = 1 - right_edge;
                 const uint8_t *src1[2];
                 uint8_t *dst1;
                 int src_idx, pos;
 
                 dst1 = dst + height * stride_dst - (left << sh);
                 src1[0] = src + height * stride_src - (left << sh);
                 src1[1] = s->sao_pixel_buffer_h[c_idx] + (((2 * y_ctb + 2) * w + x0 - left) << sh);
                 pos = 0;
                 if (left) {
                     src_idx = (CTB(s->sao, x_ctb-1, y_ctb+1).type_idx[c_idx] ==
                                SAO_APPLIED);
                     copy_pixel(dst1, src1[src_idx], sh);
                     pos += (1 << sh);
                 }
                 src_idx = (CTB(s->sao, x_ctb, y_ctb+1).type_idx[c_idx] ==
                            SAO_APPLIED);
                 memcpy(dst1 + pos, src1[src_idx] + pos, width << sh);
                 if (right) {
                     pos += width << sh;
                     src_idx = (CTB(s->sao, x_ctb+1, y_ctb+1).type_idx[c_idx] ==
                                SAO_APPLIED);
                     copy_pixel(dst1 + pos, src1[src_idx] + pos, sh);
                 }
             }
             left_pixels = 0;
             if (!left_edge) {
                 if (CTB(s->sao, x_ctb-1, y_ctb).type_idx[c_idx] == SAO_APPLIED) {
                     copy_vert(dst - (1 << sh),
                               s->sao_pixel_buffer_v[c_idx] + (((2 * x_ctb - 1) * h + y0) << sh),
                               sh, height, stride_dst, 1 << sh);
                 } else {
                     left_pixels = 1;
                 }
             }
             right_pixels = 0;
             if (!right_edge) {
                 if (CTB(s->sao, x_ctb+1, y_ctb).type_idx[c_idx] == SAO_APPLIED) {
                     copy_vert(dst + (width << sh),
                               s->sao_pixel_buffer_v[c_idx] + (((2 * x_ctb + 2) * h + y0) << sh),
                               sh, height, stride_dst, 1 << sh);
                 } else {
                     right_pixels = 1;
                 }
             }
 
             copy_CTB(dst - (left_pixels << sh),
                      src - (left_pixels << sh),
                      (width + left_pixels + right_pixels) << sh,
                      height, stride_dst, stride_src);
 
             copy_CTB_to_hv(s, src, stride_src, x0, y0, width, height, c_idx,
                            x_ctb, y_ctb);

             s->hevcdsp.sao_edge_filter[tab](src, dst, stride_src, sao->offset_val[c_idx],
                                             sao->eo_class[c_idx], width, height);

             s->hevcdsp.sao_edge_restore[restore](src, dst,

                                                 stride_src, stride_dst,

                                                 sao,
                                                 edges, width,
                                                 height, c_idx,
                                                 vert_edge,
                                                 horiz_edge,
                                                 diag_edge);

             restore_tqb_pixels(s, src, dst, stride_src, stride_dst,
                                x, y, width, height, c_idx);

             sao->type_idx[c_idx] = SAO_APPLIED;

             break;

         }

         }
     }
 }
 
 static int get_pcm(HEVCContext *s, int x, int y)
 {

     int log2_min_pu_size = s->ps.sps->log2_min_pu_size;

     int x_pu, y_pu;

     if (x < 0 || y < 0)
         return 2;
 
     x_pu = x >> log2_min_pu_size;
     y_pu = y >> log2_min_pu_size;
 

     if (x_pu >= s->ps.sps->min_pu_width || y_pu >= s->ps.sps->min_pu_height)

         return 2;

     return s->is_pcm[y_pu * s->ps.sps->min_pu_width + x_pu];

 }
 

 #define TC_CALC(qp, bs)                                                 \
     tctable[av_clip((qp) + DEFAULT_INTRA_TC_OFFSET * ((bs) - 1) +       \

                     (tc_offset & -2),                                   \

                     0, MAX_QP + DEFAULT_INTRA_TC_OFFSET)]

 
 static void deblocking_filter_CTB(HEVCContext *s, int x0, int y0)
 {
     uint8_t *src;
     int x, y;

     int chroma, beta;
     int32_t c_tc[2], tc[2];

     uint8_t no_p[2] = { 0 };
     uint8_t no_q[2] = { 0 };

     int log2_ctb_size = s->ps.sps->log2_ctb_size;

     int x_end, x_end2, y_end;

     int ctb_size        = 1 << log2_ctb_size;
     int ctb             = (x0 >> log2_ctb_size) +

                           (y0 >> log2_ctb_size) * s->ps.sps->ctb_width;

     int cur_tc_offset   = s->deblock[ctb].tc_offset;
     int cur_beta_offset = s->deblock[ctb].beta_offset;
     int left_tc_offset, left_beta_offset;
     int tc_offset, beta_offset;

     int pcmf = (s->ps.sps->pcm_enabled_flag &&
                 s->ps.sps->pcm.loop_filter_disable_flag) ||
                s->ps.pps->transquant_bypass_enable_flag;

     if (x0) {

         left_tc_offset   = s->deblock[ctb - 1].tc_offset;
         left_beta_offset = s->deblock[ctb - 1].beta_offset;

     } else {
         left_tc_offset   = 0;
         left_beta_offset = 0;

     }
 

     x_end = x0 + ctb_size;

     if (x_end > s->ps.sps->width)
         x_end = s->ps.sps->width;

     y_end = y0 + ctb_size;

     if (y_end > s->ps.sps->height)
         y_end = s->ps.sps->height;

     tc_offset   = cur_tc_offset;

     beta_offset = cur_beta_offset;
 

     x_end2 = x_end;

     if (x_end2 != s->ps.sps->width)

         x_end2 -= 8;

     for (y = y0; y < y_end; y += 8) {

         // vertical filtering luma

         for (x = x0 ? x0 : 8; x < x_end; x += 8) {

             const int bs0 = s->vertical_bs[(x +  y      * s->bs_width) >> 2];
             const int bs1 = s->vertical_bs[(x + (y + 4) * s->bs_width) >> 2];

             if (bs0 || bs1) {

                 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)];
 

                 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->ps.sps->pixel_shift)];

                 if (pcmf) {
                     no_p[0] = get_pcm(s, x - 1, y);
                     no_p[1] = get_pcm(s, x - 1, y + 4);
                     no_q[0] = get_pcm(s, x, y);
                     no_q[1] = get_pcm(s, x, y + 4);

                     s->hevcdsp.hevc_v_loop_filter_luma_c(src,
                                                          s->frame->linesize[LUMA],
                                                          beta, tc, no_p, no_q);

                 } else

                     s->hevcdsp.hevc_v_loop_filter_luma(src,
                                                        s->frame->linesize[LUMA],
                                                        beta, tc, no_p, no_q);

             }
         }

         if(!y)
              continue;

         // horizontal filtering luma
         for (x = x0 ? x0 - 8 : 0; x < x_end2; x += 8) {

             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 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 = 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->ps.sps->pixel_shift)];

                 if (pcmf) {
                     no_p[0] = get_pcm(s, x, y - 1);
                     no_p[1] = get_pcm(s, x + 4, y - 1);
                     no_q[0] = get_pcm(s, x, y);
                     no_q[1] = get_pcm(s, x + 4, y);

                     s->hevcdsp.hevc_h_loop_filter_luma_c(src,
                                                          s->frame->linesize[LUMA],
                                                          beta, tc, no_p, no_q);

                 } else

                     s->hevcdsp.hevc_h_loop_filter_luma(src,
                                                        s->frame->linesize[LUMA],
                                                        beta, tc, no_p, no_q);

             }
         }
     }
 

     if (s->ps.sps->chroma_format_idc) {

         for (chroma = 1; chroma <= 2; chroma++) {

             int h = 1 << s->ps.sps->hshift[chroma];
             int v = 1 << s->ps.sps->vshift[chroma];

 
             // vertical filtering chroma
             for (y = y0; y < y_end; y += (8 * v)) {
                 for (x = x0 ? x0 : 8 * h; x < x_end; x += (8 * h)) {
                     const int bs0 = s->vertical_bs[(x +  y            * s->bs_width) >> 2];
                     const int bs1 = s->vertical_bs[(x + (y + (4 * v)) * s->bs_width) >> 2];
 
                     if ((bs0 == 2) || (bs1 == 2)) {
                         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 * v)) + get_qPy(s, x, y + (4 * v)) + 1) >> 1;
 
                         c_tc[0] = (bs0 == 2) ? chroma_tc(s, qp0, chroma, tc_offset) : 0;
                         c_tc[1] = (bs1 == 2) ? chroma_tc(s, qp1, chroma, tc_offset) : 0;

                         src       = &s->frame->data[chroma][(y >> s->ps.sps->vshift[chroma]) * s->frame->linesize[chroma] + ((x >> s->ps.sps->hshift[chroma]) << s->ps.sps->pixel_shift)];

                         if (pcmf) {
                             no_p[0] = get_pcm(s, x - 1, y);
                             no_p[1] = get_pcm(s, x - 1, y + (4 * v));
                             no_q[0] = get_pcm(s, x, y);
                             no_q[1] = get_pcm(s, x, y + (4 * v));
                             s->hevcdsp.hevc_v_loop_filter_chroma_c(src,
                                                                    s->frame->linesize[chroma],
                                                                    c_tc, no_p, no_q);
                         } else
                             s->hevcdsp.hevc_v_loop_filter_chroma(src,
                                                                  s->frame->linesize[chroma],
                                                                  c_tc, no_p, no_q);
                     }

                 }
 

                 if(!y)
                     continue;

                 // horizontal filtering chroma
                 tc_offset = x0 ? left_tc_offset : cur_tc_offset;
                 x_end2 = x_end;

                 if (x_end != s->ps.sps->width)

                     x_end2 = x_end - 8 * h;
                 for (x = x0 ? x0 - 8 * h : 0; x < x_end2; x += (8 * h)) {
                     const int bs0 = s->horizontal_bs[( x          + y * s->bs_width) >> 2];
                     const int bs1 = s->horizontal_bs[((x + 4 * h) + y * s->bs_width) >> 2];
                     if ((bs0 == 2) || (bs1 == 2)) {
                         const int qp0 = bs0 == 2 ? (get_qPy(s, x,           y - 1) + get_qPy(s, x,           y) + 1) >> 1 : 0;
                         const int qp1 = bs1 == 2 ? (get_qPy(s, x + (4 * h), y - 1) + get_qPy(s, x + (4 * h), y) + 1) >> 1 : 0;
 
                         c_tc[0]   = bs0 == 2 ? chroma_tc(s, qp0, chroma, tc_offset)     : 0;
                         c_tc[1]   = bs1 == 2 ? chroma_tc(s, qp1, chroma, cur_tc_offset) : 0;

                         src       = &s->frame->data[chroma][(y >> s->ps.sps->vshift[1]) * s->frame->linesize[chroma] + ((x >> s->ps.sps->hshift[1]) << s->ps.sps->pixel_shift)];

                         if (pcmf) {
                             no_p[0] = get_pcm(s, x,           y - 1);
                             no_p[1] = get_pcm(s, x + (4 * h), y - 1);
                             no_q[0] = get_pcm(s, x,           y);
                             no_q[1] = get_pcm(s, x + (4 * h), y);
                             s->hevcdsp.hevc_h_loop_filter_chroma_c(src,
                                                                    s->frame->linesize[chroma],
                                                                    c_tc, no_p, no_q);
                         } else
                             s->hevcdsp.hevc_h_loop_filter_chroma(src,
                                                                  s->frame->linesize[chroma],
                                                                  c_tc, no_p, no_q);
                     }

                 }
             }
         }
     }
 }
 

 static int boundary_strength(HEVCContext *s, MvField *curr, MvField *neigh,
                              RefPicList *neigh_refPicList)

 {

     if (curr->pred_flag == PF_BI &&  neigh->pred_flag == PF_BI) {
         // same L0 and L1
         if (s->ref->refPicList[0].list[curr->ref_idx[0]] == neigh_refPicList[0].list[neigh->ref_idx[0]]  &&
             s->ref->refPicList[0].list[curr->ref_idx[0]] == s->ref->refPicList[1].list[curr->ref_idx[1]] &&
             neigh_refPicList[0].list[neigh->ref_idx[0]] == neigh_refPicList[1].list[neigh->ref_idx[1]]) {
             if ((FFABS(neigh->mv[0].x - curr->mv[0].x) >= 4 || FFABS(neigh->mv[0].y - curr->mv[0].y) >= 4 ||
                  FFABS(neigh->mv[1].x - curr->mv[1].x) >= 4 || FFABS(neigh->mv[1].y - curr->mv[1].y) >= 4) &&
                 (FFABS(neigh->mv[1].x - curr->mv[0].x) >= 4 || FFABS(neigh->mv[1].y - curr->mv[0].y) >= 4 ||
                  FFABS(neigh->mv[0].x - curr->mv[1].x) >= 4 || FFABS(neigh->mv[0].y - curr->mv[1].y) >= 4))

                 return 1;

             else
                 return 0;
         } else if (neigh_refPicList[0].list[neigh->ref_idx[0]] == s->ref->refPicList[0].list[curr->ref_idx[0]] &&
                    neigh_refPicList[1].list[neigh->ref_idx[1]] == s->ref->refPicList[1].list[curr->ref_idx[1]]) {
             if (FFABS(neigh->mv[0].x - curr->mv[0].x) >= 4 || FFABS(neigh->mv[0].y - curr->mv[0].y) >= 4 ||
                 FFABS(neigh->mv[1].x - curr->mv[1].x) >= 4 || FFABS(neigh->mv[1].y - curr->mv[1].y) >= 4)
                 return 1;
             else
                 return 0;
         } else if (neigh_refPicList[1].list[neigh->ref_idx[1]] == s->ref->refPicList[0].list[curr->ref_idx[0]] &&
                    neigh_refPicList[0].list[neigh->ref_idx[0]] == s->ref->refPicList[1].list[curr->ref_idx[1]]) {
             if (FFABS(neigh->mv[1].x - curr->mv[0].x) >= 4 || FFABS(neigh->mv[1].y - curr->mv[0].y) >= 4 ||
                 FFABS(neigh->mv[0].x - curr->mv[1].x) >= 4 || FFABS(neigh->mv[0].y - curr->mv[1].y) >= 4)
                 return 1;
             else
                 return 0;
         } else {
             return 1;
         }
     } else if ((curr->pred_flag != PF_BI) && (neigh->pred_flag != PF_BI)){ // 1 MV
         Mv A, B;
         int ref_A, ref_B;
 
         if (curr->pred_flag & 1) {
             A     = curr->mv[0];
             ref_A = s->ref->refPicList[0].list[curr->ref_idx[0]];
         } else {
             A     = curr->mv[1];
             ref_A = s->ref->refPicList[1].list[curr->ref_idx[1]];
         }

         if (neigh->pred_flag & 1) {
             B     = neigh->mv[0];
             ref_B = neigh_refPicList[0].list[neigh->ref_idx[0]];
         } else {
             B     = neigh->mv[1];
             ref_B = neigh_refPicList[1].list[neigh->ref_idx[1]];
         }

         if (ref_A == ref_B) {
             if (FFABS(A.x - B.x) >= 4 || FFABS(A.y - B.y) >= 4)

                 return 1;

             else
                 return 0;
         } else
             return 1;

     }
 
     return 1;
 }
 

 void ff_hevc_deblocking_boundary_strengths(HEVCContext *s, int x0, int y0,

                                            int log2_trafo_size)

 {

     HEVCLocalContext *lc = s->HEVClc;

     MvField *tab_mvf     = s->ref->tab_mvf;

     int log2_min_pu_size = s->ps.sps->log2_min_pu_size;
     int log2_min_tu_size = s->ps.sps->log2_min_tb_size;
     int min_pu_width     = s->ps.sps->min_pu_width;
     int min_tu_width     = s->ps.sps->min_tb_width;

     int is_intra = tab_mvf[(y0 >> log2_min_pu_size) * min_pu_width +

                            (x0 >> log2_min_pu_size)].pred_flag == PF_INTRA;

     int boundary_upper, boundary_left;

     int i, j, bs;

     boundary_upper = y0 > 0 && !(y0 & 7);
     if (boundary_upper &&
         ((!s->sh.slice_loop_filter_across_slices_enabled_flag &&
           lc->boundary_flags & BOUNDARY_UPPER_SLICE &&

           (y0 % (1 << s->ps.sps->log2_ctb_size)) == 0) ||
          (!s->ps.pps->loop_filter_across_tiles_enabled_flag &&

           lc->boundary_flags & BOUNDARY_UPPER_TILE &&

           (y0 % (1 << s->ps.sps->log2_ctb_size)) == 0)))

         boundary_upper = 0;
 
     if (boundary_upper) {

         RefPicList *rpl_top = (lc->boundary_flags & BOUNDARY_UPPER_SLICE) ?
                               ff_hevc_get_ref_list(s, s->ref, x0, y0 - 1) :
                               s->ref->refPicList;

         int yp_pu = (y0 - 1) >> log2_min_pu_size;
         int yq_pu =  y0      >> log2_min_pu_size;
         int yp_tu = (y0 - 1) >> log2_min_tu_size;
         int yq_tu =  y0      >> log2_min_tu_size;
 

             for (i = 0; i < (1 << log2_trafo_size); i += 4) {

                 int x_pu = (x0 + i) >> log2_min_pu_size;
                 int x_tu = (x0 + i) >> log2_min_tu_size;

                 MvField *top  = &tab_mvf[yp_pu * min_pu_width + x_pu];
                 MvField *curr = &tab_mvf[yq_pu * min_pu_width + x_pu];
                 uint8_t top_cbf_luma  = s->cbf_luma[yp_tu * min_tu_width + x_tu];
                 uint8_t curr_cbf_luma = s->cbf_luma[yq_tu * min_tu_width + x_tu];

 
                 if (curr->pred_flag == PF_INTRA || top->pred_flag == PF_INTRA)
                     bs = 2;
                 else if (curr_cbf_luma || top_cbf_luma)
                     bs = 1;
                 else

                     bs = boundary_strength(s, curr, top, rpl_top);

                 s->horizontal_bs[((x0 + i) + y0 * s->bs_width) >> 2] = bs;

             }

     }

 
     // bs for vertical TU boundaries

     boundary_left = x0 > 0 && !(x0 & 7);
     if (boundary_left &&
         ((!s->sh.slice_loop_filter_across_slices_enabled_flag &&
           lc->boundary_flags & BOUNDARY_LEFT_SLICE &&

           (x0 % (1 << s->ps.sps->log2_ctb_size)) == 0) ||
          (!s->ps.pps->loop_filter_across_tiles_enabled_flag &&

           lc->boundary_flags & BOUNDARY_LEFT_TILE &&

           (x0 % (1 << s->ps.sps->log2_ctb_size)) == 0)))

         boundary_left = 0;
 
     if (boundary_left) {

         RefPicList *rpl_left = (lc->boundary_flags & BOUNDARY_LEFT_SLICE) ?
                                ff_hevc_get_ref_list(s, s->ref, x0 - 1, y0) :
                                s->ref->refPicList;

         int xp_pu = (x0 - 1) >> log2_min_pu_size;
         int xq_pu =  x0      >> log2_min_pu_size;
         int xp_tu = (x0 - 1) >> log2_min_tu_size;
         int xq_tu =  x0      >> log2_min_tu_size;

 
             for (i = 0; i < (1 << log2_trafo_size); i += 4) {
                 int y_pu      = (y0 + i) >> log2_min_pu_size;
                 int y_tu      = (y0 + i) >> log2_min_tu_size;
                 MvField *left = &tab_mvf[y_pu * min_pu_width + xp_pu];
                 MvField *curr = &tab_mvf[y_pu * min_pu_width + xq_pu];
                 uint8_t left_cbf_luma = s->cbf_luma[y_tu * min_tu_width + xp_tu];
                 uint8_t curr_cbf_luma = s->cbf_luma[y_tu * min_tu_width + xq_tu];
 
                 if (curr->pred_flag == PF_INTRA || left->pred_flag == PF_INTRA)
                     bs = 2;
                 else if (curr_cbf_luma || left_cbf_luma)
                     bs = 1;
                 else

                     bs = boundary_strength(s, curr, left, rpl_left);

                 s->vertical_bs[(x0 + (y0 + i) * s->bs_width) >> 2] = bs;

             }

     }
 

     if (log2_trafo_size > log2_min_pu_size && !is_intra) {

         RefPicList *rpl = s->ref->refPicList;
 

         // bs for TU internal horizontal PU boundaries
         for (j = 8; j < (1 << log2_trafo_size); j += 8) {
             int yp_pu = (y0 + j - 1) >> log2_min_pu_size;
             int yq_pu = (y0 + j)     >> log2_min_pu_size;
 
             for (i = 0; i < (1 << log2_trafo_size); i += 4) {
                 int x_pu = (x0 + i) >> log2_min_pu_size;
                 MvField *top  = &tab_mvf[yp_pu * min_pu_width + x_pu];
                 MvField *curr = &tab_mvf[yq_pu * min_pu_width + x_pu];
 

                 bs = boundary_strength(s, curr, top, rpl);

                 s->horizontal_bs[((x0 + i) + (y0 + j) * s->bs_width) >> 2] = bs;
             }
         }
 
         // bs for TU internal vertical PU boundaries

         for (j = 0; j < (1 << log2_trafo_size); j += 4) {
             int y_pu = (y0 + j) >> log2_min_pu_size;
 
             for (i = 8; i < (1 << log2_trafo_size); i += 8) {
                 int xp_pu = (x0 + i - 1) >> log2_min_pu_size;

                 int xq_pu = (x0 + i)     >> log2_min_pu_size;

                 MvField *left = &tab_mvf[y_pu * min_pu_width + xp_pu];
                 MvField *curr = &tab_mvf[y_pu * min_pu_width + xq_pu];

                 bs = boundary_strength(s, curr, left, rpl);

                 s->vertical_bs[((x0 + i) + (y0 + j) * s->bs_width) >> 2] = bs;

             }
         }

     }

 }

 #undef LUMA
 #undef CB
 #undef CR
 

 void ff_hevc_hls_filter(HEVCContext *s, int x, int y, int ctb_size)

 {

     int x_end = x >= s->ps.sps->width  - ctb_size;

     if (s->avctx->skip_loop_filter < AVDISCARD_ALL)
         deblocking_filter_CTB(s, x, y);

     if (s->ps.sps->sao_enabled) {
         int y_end = y >= s->ps.sps->height - ctb_size;

         if (y && x)
             sao_filter_CTB(s, x - ctb_size, y - ctb_size);
         if (x && y_end)
             sao_filter_CTB(s, x - ctb_size, y);
         if (y && x_end) {
             sao_filter_CTB(s, x, y - ctb_size);
             if (s->threads_type & FF_THREAD_FRAME )

                 ff_thread_report_progress(&s->ref->tf, y, 0);

         }
         if (x_end && y_end) {
             sao_filter_CTB(s, x , y);
             if (s->threads_type & FF_THREAD_FRAME )

                 ff_thread_report_progress(&s->ref->tf, y + ctb_size, 0);

         }

     } else if (s->threads_type & FF_THREAD_FRAME && x_end)
         ff_thread_report_progress(&s->ref->tf, y + ctb_size - 4, 0);

 }
 
 void ff_hevc_hls_filters(HEVCContext *s, int x_ctb, int y_ctb, int ctb_size)
 {

     int x_end = x_ctb >= s->ps.sps->width  - ctb_size;
     int y_end = y_ctb >= s->ps.sps->height - ctb_size;

     if (y_ctb && x_ctb)

         ff_hevc_hls_filter(s, x_ctb - ctb_size, y_ctb - ctb_size, ctb_size);
     if (y_ctb && x_end)
         ff_hevc_hls_filter(s, x_ctb, y_ctb - ctb_size, ctb_size);
     if (x_ctb && y_end)
         ff_hevc_hls_filter(s, x_ctb - ctb_size, y_ctb, ctb_size);

 }