git.sesse.net Git - ffmpeg/blob - libavcodec/hevc_filter.c

   1 /*
   2  * HEVC video decoder
   3  *
   4  * Copyright (C) 2012 - 2013 Guillaume Martres
   5  * Copyright (C) 2013 Seppo Tomperi
   6  * Copyright (C) 2013 Wassim Hamidouche
   7  *
   8  * This file is part of FFmpeg.
   9  *
  10  * FFmpeg is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * FFmpeg is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with FFmpeg; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  23  */
  24
  25 #include "libavutil/common.h"
  26 #include "libavutil/internal.h"
  27
  28 #include "cabac_functions.h"
  29 #include "hevcdec.h"
  30
  31 #include "bit_depth_template.c"
  32
  33 #define LUMA 0
  34 #define CB 1
  35 #define CR 2
  36
  37 static const uint8_t tctable[54] = {
  38     0, 0, 0, 0, 0, 0, 0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 0, 0, 1, // QP  0...18
  39     1, 1, 1, 1, 1, 1, 1,  1,  2,  2,  2,  2,  3,  3,  3,  3, 4, 4, 4, // QP 19...37
  40     5, 5, 6, 6, 7, 8, 9, 10, 11, 13, 14, 16, 18, 20, 22, 24           // QP 38...53
  41 };
  42
  43 static const uint8_t betatable[52] = {
  44      0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  6,  7,  8, // QP 0...18
  45      9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, // QP 19...37
  46     38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64                      // QP 38...51
  47 };
  48
  49 static int chroma_tc(HEVCContext *s, int qp_y, int c_idx, int tc_offset)
  50 {
  51     static const int qp_c[] = {
  52         29, 30, 31, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37
  53     };
  54     int qp, qp_i, offset, idxt;
  55
  56     // slice qp offset is not used for deblocking
  57     if (c_idx == 1)
  58         offset = s->ps.pps->cb_qp_offset;
  59     else
  60         offset = s->ps.pps->cr_qp_offset;
  61
  62     qp_i = av_clip(qp_y + offset, 0, 57);
  63     if (s->ps.sps->chroma_format_idc == 1) {
  64         if (qp_i < 30)
  65             qp = qp_i;
  66         else if (qp_i > 43)
  67             qp = qp_i - 6;
  68         else
  69             qp = qp_c[qp_i - 30];
  70     } else {
  71         qp = av_clip(qp_i, 0, 51);
  72     }
  73
  74     idxt = av_clip(qp + DEFAULT_INTRA_TC_OFFSET + tc_offset, 0, 53);
  75     return tctable[idxt];
  76 }
  77
  78 static int get_qPy_pred(HEVCContext *s, int xBase, int yBase, int log2_cb_size)
  79 {
  80     HEVCLocalContext *lc     = s->HEVClc;
  81     int ctb_size_mask        = (1 << s->ps.sps->log2_ctb_size) - 1;
  82     int MinCuQpDeltaSizeMask = (1 << (s->ps.sps->log2_ctb_size -
  83                                       s->ps.pps->diff_cu_qp_delta_depth)) - 1;
  84     int xQgBase              = xBase - (xBase & MinCuQpDeltaSizeMask);
  85     int yQgBase              = yBase - (yBase & MinCuQpDeltaSizeMask);
  86     int min_cb_width         = s->ps.sps->min_cb_width;
  87     int x_cb                 = xQgBase >> s->ps.sps->log2_min_cb_size;
  88     int y_cb                 = yQgBase >> s->ps.sps->log2_min_cb_size;
  89     int availableA           = (xBase   & ctb_size_mask) &&
  90                                (xQgBase & ctb_size_mask);
  91     int availableB           = (yBase   & ctb_size_mask) &&
  92                                (yQgBase & ctb_size_mask);
  93     int qPy_pred, qPy_a, qPy_b;
  94
  95     // qPy_pred
  96     if (lc->first_qp_group || (!xQgBase && !yQgBase)) {
  97         lc->first_qp_group = !lc->tu.is_cu_qp_delta_coded;
  98         qPy_pred = s->sh.slice_qp;
  99     } else {
 100         qPy_pred = lc->qPy_pred;
 101     }
 102
 103     // qPy_a
 104     if (availableA == 0)
 105         qPy_a = qPy_pred;
 106     else
 107         qPy_a = s->qp_y_tab[(x_cb - 1) + y_cb * min_cb_width];
 108
 109     // qPy_b
 110     if (availableB == 0)
 111         qPy_b = qPy_pred;
 112     else
 113         qPy_b = s->qp_y_tab[x_cb + (y_cb - 1) * min_cb_width];
 114
 115     av_assert2(qPy_a >= -s->ps.sps->qp_bd_offset && qPy_a < 52);
 116     av_assert2(qPy_b >= -s->ps.sps->qp_bd_offset && qPy_b < 52);
 117
 118     return (qPy_a + qPy_b + 1) >> 1;
 119 }
 120
 121 void ff_hevc_set_qPy(HEVCContext *s, int xBase, int yBase, int log2_cb_size)
 122 {
 123     int qp_y = get_qPy_pred(s, xBase, yBase, log2_cb_size);
 124
 125     if (s->HEVClc->tu.cu_qp_delta != 0) {
 126         int off = s->ps.sps->qp_bd_offset;
 127         s->HEVClc->qp_y = FFUMOD(qp_y + s->HEVClc->tu.cu_qp_delta + 52 + 2 * off,
 128                                  52 + off) - off;
 129     } else
 130         s->HEVClc->qp_y = qp_y;
 131 }
 132
 133 static int get_qPy(HEVCContext *s, int xC, int yC)
 134 {
 135     int log2_min_cb_size  = s->ps.sps->log2_min_cb_size;
 136     int x                 = xC >> log2_min_cb_size;
 137     int y                 = yC >> log2_min_cb_size;
 138     return s->qp_y_tab[x + y * s->ps.sps->min_cb_width];
 139 }
 140
 141 static void copy_CTB(uint8_t *dst, const uint8_t *src, int width, int height,
 142                      ptrdiff_t stride_dst, ptrdiff_t stride_src)
 143 {
 144 int i, j;
 145
 146     if (((intptr_t)dst | (intptr_t)src | stride_dst | stride_src) & 15) {
 147         for (i = 0; i < height; i++) {
 148             for (j = 0; j < width; j+=8)
 149                 AV_COPY64U(dst+j, src+j);
 150             dst += stride_dst;
 151             src += stride_src;
 152         }
 153     } else {
 154         for (i = 0; i < height; i++) {
 155             for (j = 0; j < width; j+=16)
 156                 AV_COPY128(dst+j, src+j);
 157             dst += stride_dst;
 158             src += stride_src;
 159         }
 160     }
 161 }
 162
 163 static void copy_pixel(uint8_t *dst, const uint8_t *src, int pixel_shift)
 164 {
 165     if (pixel_shift)
 166         *(uint16_t *)dst = *(uint16_t *)src;
 167     else
 168         *dst = *src;
 169 }
 170
 171 static void copy_vert(uint8_t *dst, const uint8_t *src,
 172                       int pixel_shift, int height,
 173                       ptrdiff_t stride_dst, ptrdiff_t stride_src)
 174 {
 175     int i;
 176     if (pixel_shift == 0) {
 177         for (i = 0; i < height; i++) {
 178             *dst = *src;
 179             dst += stride_dst;
 180             src += stride_src;
 181         }
 182     } else {
 183         for (i = 0; i < height; i++) {
 184             *(uint16_t *)dst = *(uint16_t *)src;
 185             dst += stride_dst;
 186             src += stride_src;
 187         }
 188     }
 189 }
 190
 191 static void copy_CTB_to_hv(HEVCContext *s, const uint8_t *src,
 192                            ptrdiff_t stride_src, int x, int y, int width, int height,
 193                            int c_idx, int x_ctb, int y_ctb)
 194 {
 195     int sh = s->ps.sps->pixel_shift;
 196     int w = s->ps.sps->width >> s->ps.sps->hshift[c_idx];
 197     int h = s->ps.sps->height >> s->ps.sps->vshift[c_idx];
 198
 199     /* copy horizontal edges */
 200     memcpy(s->sao_pixel_buffer_h[c_idx] + (((2 * y_ctb) * w + x) << sh),
 201         src, width << sh);
 202     memcpy(s->sao_pixel_buffer_h[c_idx] + (((2 * y_ctb + 1) * w + x) << sh),
 203         src + stride_src * (height - 1), width << sh);
 204
 205     /* copy vertical edges */
 206     copy_vert(s->sao_pixel_buffer_v[c_idx] + (((2 * x_ctb) * h + y) << sh), src, sh, height, 1 << sh, stride_src);
 207
 208     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);
 209 }
 210
 211 static void restore_tqb_pixels(HEVCContext *s,
 212                                uint8_t *src1, const uint8_t *dst1,
 213                                ptrdiff_t stride_src, ptrdiff_t stride_dst,
 214                                int x0, int y0, int width, int height, int c_idx)
 215 {
 216     if ( s->ps.pps->transquant_bypass_enable_flag ||
 217             (s->ps.sps->pcm.loop_filter_disable_flag && s->ps.sps->pcm_enabled_flag)) {
 218         int x, y;
 219         int min_pu_size  = 1 << s->ps.sps->log2_min_pu_size;
 220         int hshift       = s->ps.sps->hshift[c_idx];
 221         int vshift       = s->ps.sps->vshift[c_idx];
 222         int x_min        = ((x0         ) >> s->ps.sps->log2_min_pu_size);
 223         int y_min        = ((y0         ) >> s->ps.sps->log2_min_pu_size);
 224         int x_max        = ((x0 + width ) >> s->ps.sps->log2_min_pu_size);
 225         int y_max        = ((y0 + height) >> s->ps.sps->log2_min_pu_size);
 226         int len          = (min_pu_size >> hshift) << s->ps.sps->pixel_shift;
 227         for (y = y_min; y < y_max; y++) {
 228             for (x = x_min; x < x_max; x++) {
 229                 if (s->is_pcm[y * s->ps.sps->min_pu_width + x]) {
 230                     int n;
 231                     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);
 232                     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);
 233                     for (n = 0; n < (min_pu_size >> vshift); n++) {
 234                         memcpy(src, dst, len);
 235                         src += stride_src;
 236                         dst += stride_dst;
 237                     }
 238                 }
 239             }
 240         }
 241     }
 242 }
 243
 244 #define CTB(tab, x, y) ((tab)[(y) * s->ps.sps->ctb_width + (x)])
 245
 246 static void sao_filter_CTB(HEVCContext *s, int x, int y)
 247 {
 248     static const uint8_t sao_tab[8] = { 0, 1, 2, 2, 3, 3, 4, 4 };
 249     HEVCLocalContext *lc = s->HEVClc;
 250     int c_idx;
 251     int edges[4];  // 0 left 1 top 2 right 3 bottom
 252     int x_ctb                = x >> s->ps.sps->log2_ctb_size;
 253     int y_ctb                = y >> s->ps.sps->log2_ctb_size;
 254     int ctb_addr_rs          = y_ctb * s->ps.sps->ctb_width + x_ctb;
 255     int ctb_addr_ts          = s->ps.pps->ctb_addr_rs_to_ts[ctb_addr_rs];
 256     SAOParams *sao           = &CTB(s->sao, x_ctb, y_ctb);
 257     // flags indicating unfilterable edges
 258     uint8_t vert_edge[]      = { 0, 0 };
 259     uint8_t horiz_edge[]     = { 0, 0 };
 260     uint8_t diag_edge[]      = { 0, 0, 0, 0 };
 261     uint8_t lfase            = CTB(s->filter_slice_edges, x_ctb, y_ctb);
 262     uint8_t no_tile_filter   = s->ps.pps->tiles_enabled_flag &&
 263                                !s->ps.pps->loop_filter_across_tiles_enabled_flag;
 264     uint8_t restore          = no_tile_filter || !lfase;
 265     uint8_t left_tile_edge   = 0;
 266     uint8_t right_tile_edge  = 0;
 267     uint8_t up_tile_edge     = 0;
 268     uint8_t bottom_tile_edge = 0;
 269
 270     edges[0]   = x_ctb == 0;
 271     edges[1]   = y_ctb == 0;
 272     edges[2]   = x_ctb == s->ps.sps->ctb_width  - 1;
 273     edges[3]   = y_ctb == s->ps.sps->ctb_height - 1;
 274
 275     if (restore) {
 276         if (!edges[0]) {
 277             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]];
 278             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;
 279         }
 280         if (!edges[2]) {
 281             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]];
 282             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;
 283         }
 284         if (!edges[1]) {
 285             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]];
 286             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;
 287         }
 288         if (!edges[3]) {
 289             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]];
 290             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;
 291         }
 292         if (!edges[0] && !edges[1]) {
 293             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;
 294         }
 295         if (!edges[1] && !edges[2]) {
 296             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;
 297         }
 298         if (!edges[2] && !edges[3]) {
 299             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;
 300         }
 301         if (!edges[0] && !edges[3]) {
 302             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;
 303         }
 304     }
 305
 306     for (c_idx = 0; c_idx < (s->ps.sps->chroma_format_idc ? 3 : 1); c_idx++) {
 307         int x0       = x >> s->ps.sps->hshift[c_idx];
 308         int y0       = y >> s->ps.sps->vshift[c_idx];
 309         ptrdiff_t stride_src = s->frame->linesize[c_idx];
 310         int ctb_size_h = (1 << (s->ps.sps->log2_ctb_size)) >> s->ps.sps->hshift[c_idx];
 311         int ctb_size_v = (1 << (s->ps.sps->log2_ctb_size)) >> s->ps.sps->vshift[c_idx];
 312         int width    = FFMIN(ctb_size_h, (s->ps.sps->width  >> s->ps.sps->hshift[c_idx]) - x0);
 313         int height   = FFMIN(ctb_size_v, (s->ps.sps->height >> s->ps.sps->vshift[c_idx]) - y0);
 314         int tab      = sao_tab[(FFALIGN(width, 8) >> 3) - 1];
 315         uint8_t *src = &s->frame->data[c_idx][y0 * stride_src + (x0 << s->ps.sps->pixel_shift)];
 316         ptrdiff_t stride_dst;
 317         uint8_t *dst;
 318
 319         switch (sao->type_idx[c_idx]) {
 320         case SAO_BAND:
 321             copy_CTB_to_hv(s, src, stride_src, x0, y0, width, height, c_idx,
 322                            x_ctb, y_ctb);
 323             if (s->ps.pps->transquant_bypass_enable_flag ||
 324                 (s->ps.sps->pcm.loop_filter_disable_flag && s->ps.sps->pcm_enabled_flag)) {
 325             dst = lc->edge_emu_buffer;
 326             stride_dst = 2*MAX_PB_SIZE;
 327             copy_CTB(dst, src, width << s->ps.sps->pixel_shift, height, stride_dst, stride_src);
 328             s->hevcdsp.sao_band_filter[tab](src, dst, stride_src, stride_dst,
 329                                             sao->offset_val[c_idx], sao->band_position[c_idx],
 330                                             width, height);
 331             restore_tqb_pixels(s, src, dst, stride_src, stride_dst,
 332                                x, y, width, height, c_idx);
 333             } else {
 334             s->hevcdsp.sao_band_filter[tab](src, src, stride_src, stride_src,
 335                                             sao->offset_val[c_idx], sao->band_position[c_idx],
 336                                             width, height);
 337             }
 338             sao->type_idx[c_idx] = SAO_APPLIED;
 339             break;
 340         case SAO_EDGE:
 341         {
 342             int w = s->ps.sps->width >> s->ps.sps->hshift[c_idx];
 343             int h = s->ps.sps->height >> s->ps.sps->vshift[c_idx];
 344             int left_edge = edges[0];
 345             int top_edge = edges[1];
 346             int right_edge = edges[2];
 347             int bottom_edge = edges[3];
 348             int sh = s->ps.sps->pixel_shift;
 349             int left_pixels, right_pixels;
 350
 351             stride_dst = 2*MAX_PB_SIZE + AV_INPUT_BUFFER_PADDING_SIZE;
 352             dst = lc->edge_emu_buffer + stride_dst + AV_INPUT_BUFFER_PADDING_SIZE;
 353
 354             if (!top_edge) {
 355                 int left = 1 - left_edge;
 356                 int right = 1 - right_edge;
 357                 const uint8_t *src1[2];
 358                 uint8_t *dst1;
 359                 int src_idx, pos;
 360
 361                 dst1 = dst - stride_dst - (left << sh);
 362                 src1[0] = src - stride_src - (left << sh);
 363                 src1[1] = s->sao_pixel_buffer_h[c_idx] + (((2 * y_ctb - 1) * w + x0 - left) << sh);
 364                 pos = 0;
 365                 if (left) {
 366                     src_idx = (CTB(s->sao, x_ctb-1, y_ctb-1).type_idx[c_idx] ==
 367                                SAO_APPLIED);
 368                     copy_pixel(dst1, src1[src_idx], sh);
 369                     pos += (1 << sh);
 370                 }
 371                 src_idx = (CTB(s->sao, x_ctb, y_ctb-1).type_idx[c_idx] ==
 372                            SAO_APPLIED);
 373                 memcpy(dst1 + pos, src1[src_idx] + pos, width << sh);
 374                 if (right) {
 375                     pos += width << sh;
 376                     src_idx = (CTB(s->sao, x_ctb+1, y_ctb-1).type_idx[c_idx] ==
 377                                SAO_APPLIED);
 378                     copy_pixel(dst1 + pos, src1[src_idx] + pos, sh);
 379                 }
 380             }
 381             if (!bottom_edge) {
 382                 int left = 1 - left_edge;
 383                 int right = 1 - right_edge;
 384                 const uint8_t *src1[2];
 385                 uint8_t *dst1;
 386                 int src_idx, pos;
 387
 388                 dst1 = dst + height * stride_dst - (left << sh);
 389                 src1[0] = src + height * stride_src - (left << sh);
 390                 src1[1] = s->sao_pixel_buffer_h[c_idx] + (((2 * y_ctb + 2) * w + x0 - left) << sh);
 391                 pos = 0;
 392                 if (left) {
 393                     src_idx = (CTB(s->sao, x_ctb-1, y_ctb+1).type_idx[c_idx] ==
 394                                SAO_APPLIED);
 395                     copy_pixel(dst1, src1[src_idx], sh);
 396                     pos += (1 << sh);
 397                 }
 398                 src_idx = (CTB(s->sao, x_ctb, y_ctb+1).type_idx[c_idx] ==
 399                            SAO_APPLIED);
 400                 memcpy(dst1 + pos, src1[src_idx] + pos, width << sh);
 401                 if (right) {
 402                     pos += width << sh;
 403                     src_idx = (CTB(s->sao, x_ctb+1, y_ctb+1).type_idx[c_idx] ==
 404                                SAO_APPLIED);
 405                     copy_pixel(dst1 + pos, src1[src_idx] + pos, sh);
 406                 }
 407             }
 408             left_pixels = 0;
 409             if (!left_edge) {
 410                 if (CTB(s->sao, x_ctb-1, y_ctb).type_idx[c_idx] == SAO_APPLIED) {
 411                     copy_vert(dst - (1 << sh),
 412                               s->sao_pixel_buffer_v[c_idx] + (((2 * x_ctb - 1) * h + y0) << sh),
 413                               sh, height, stride_dst, 1 << sh);
 414                 } else {
 415                     left_pixels = 1;
 416                 }
 417             }
 418             right_pixels = 0;
 419             if (!right_edge) {
 420                 if (CTB(s->sao, x_ctb+1, y_ctb).type_idx[c_idx] == SAO_APPLIED) {
 421                     copy_vert(dst + (width << sh),
 422                               s->sao_pixel_buffer_v[c_idx] + (((2 * x_ctb + 2) * h + y0) << sh),
 423                               sh, height, stride_dst, 1 << sh);
 424                 } else {
 425                     right_pixels = 1;
 426                 }
 427             }
 428
 429             copy_CTB(dst - (left_pixels << sh),
 430                      src - (left_pixels << sh),
 431                      (width + left_pixels + right_pixels) << sh,
 432                      height, stride_dst, stride_src);
 433
 434             copy_CTB_to_hv(s, src, stride_src, x0, y0, width, height, c_idx,
 435                            x_ctb, y_ctb);
 436             s->hevcdsp.sao_edge_filter[tab](src, dst, stride_src, sao->offset_val[c_idx],
 437                                             sao->eo_class[c_idx], width, height);
 438             s->hevcdsp.sao_edge_restore[restore](src, dst,
 439                                                 stride_src, stride_dst,
 440                                                 sao,
 441                                                 edges, width,
 442                                                 height, c_idx,
 443                                                 vert_edge,
 444                                                 horiz_edge,
 445                                                 diag_edge);
 446             restore_tqb_pixels(s, src, dst, stride_src, stride_dst,
 447                                x, y, width, height, c_idx);
 448             sao->type_idx[c_idx] = SAO_APPLIED;
 449             break;
 450         }
 451         }
 452     }
 453 }
 454
 455 static int get_pcm(HEVCContext *s, int x, int y)
 456 {
 457     int log2_min_pu_size = s->ps.sps->log2_min_pu_size;
 458     int x_pu, y_pu;
 459
 460     if (x < 0 || y < 0)
 461         return 2;
 462
 463     x_pu = x >> log2_min_pu_size;
 464     y_pu = y >> log2_min_pu_size;
 465
 466     if (x_pu >= s->ps.sps->min_pu_width || y_pu >= s->ps.sps->min_pu_height)
 467         return 2;
 468     return s->is_pcm[y_pu * s->ps.sps->min_pu_width + x_pu];
 469 }
 470
 471 #define TC_CALC(qp, bs)                                                 \
 472     tctable[av_clip((qp) + DEFAULT_INTRA_TC_OFFSET * ((bs) - 1) +       \
 473                     (tc_offset & -2),                                   \
 474                     0, MAX_QP + DEFAULT_INTRA_TC_OFFSET)]
 475
 476 static void deblocking_filter_CTB(HEVCContext *s, int x0, int y0)
 477 {
 478     uint8_t *src;
 479     int x, y;
 480     int chroma, beta;
 481     int32_t c_tc[2], tc[2];
 482     uint8_t no_p[2] = { 0 };
 483     uint8_t no_q[2] = { 0 };
 484
 485     int log2_ctb_size = s->ps.sps->log2_ctb_size;
 486     int x_end, x_end2, y_end;
 487     int ctb_size        = 1 << log2_ctb_size;
 488     int ctb             = (x0 >> log2_ctb_size) +
 489                           (y0 >> log2_ctb_size) * s->ps.sps->ctb_width;
 490     int cur_tc_offset   = s->deblock[ctb].tc_offset;
 491     int cur_beta_offset = s->deblock[ctb].beta_offset;
 492     int left_tc_offset, left_beta_offset;
 493     int tc_offset, beta_offset;
 494     int pcmf = (s->ps.sps->pcm_enabled_flag &&
 495                 s->ps.sps->pcm.loop_filter_disable_flag) ||
 496                s->ps.pps->transquant_bypass_enable_flag;
 497
 498     if (x0) {
 499         left_tc_offset   = s->deblock[ctb - 1].tc_offset;
 500         left_beta_offset = s->deblock[ctb - 1].beta_offset;
 501     } else {
 502         left_tc_offset   = 0;
 503         left_beta_offset = 0;
 504     }
 505
 506     x_end = x0 + ctb_size;
 507     if (x_end > s->ps.sps->width)
 508         x_end = s->ps.sps->width;
 509     y_end = y0 + ctb_size;
 510     if (y_end > s->ps.sps->height)
 511         y_end = s->ps.sps->height;
 512
 513     tc_offset   = cur_tc_offset;
 514     beta_offset = cur_beta_offset;
 515
 516     x_end2 = x_end;
 517     if (x_end2 != s->ps.sps->width)
 518         x_end2 -= 8;
 519     for (y = y0; y < y_end; y += 8) {
 520         // vertical filtering luma
 521         for (x = x0 ? x0 : 8; x < x_end; x += 8) {
 522             const int bs0 = s->vertical_bs[(x +  y      * s->bs_width) >> 2];
 523             const int bs1 = s->vertical_bs[(x + (y + 4) * s->bs_width) >> 2];
 524             if (bs0 || bs1) {
 525                 const int qp = (get_qPy(s, x - 1, y)     + get_qPy(s, x, y)     + 1) >> 1;
 526
 527                 beta = betatable[av_clip(qp + beta_offset, 0, MAX_QP)];
 528
 529                 tc[0]   = bs0 ? TC_CALC(qp, bs0) : 0;
 530                 tc[1]   = bs1 ? TC_CALC(qp, bs1) : 0;
 531                 src     = &s->frame->data[LUMA][y * s->frame->linesize[LUMA] + (x << s->ps.sps->pixel_shift)];
 532                 if (pcmf) {
 533                     no_p[0] = get_pcm(s, x - 1, y);
 534                     no_p[1] = get_pcm(s, x - 1, y + 4);
 535                     no_q[0] = get_pcm(s, x, y);
 536                     no_q[1] = get_pcm(s, x, y + 4);
 537                     s->hevcdsp.hevc_v_loop_filter_luma_c(src,
 538                                                          s->frame->linesize[LUMA],
 539                                                          beta, tc, no_p, no_q);
 540                 } else
 541                     s->hevcdsp.hevc_v_loop_filter_luma(src,
 542                                                        s->frame->linesize[LUMA],
 543                                                        beta, tc, no_p, no_q);
 544             }
 545         }
 546
 547         if(!y)
 548              continue;
 549
 550         // horizontal filtering luma
 551         for (x = x0 ? x0 - 8 : 0; x < x_end2; x += 8) {
 552             const int bs0 = s->horizontal_bs[( x      + y * s->bs_width) >> 2];
 553             const int bs1 = s->horizontal_bs[((x + 4) + y * s->bs_width) >> 2];
 554             if (bs0 || bs1) {
 555                 const int qp = (get_qPy(s, x, y - 1)     + get_qPy(s, x, y)     + 1) >> 1;
 556
 557                 tc_offset   = x >= x0 ? cur_tc_offset : left_tc_offset;
 558                 beta_offset = x >= x0 ? cur_beta_offset : left_beta_offset;
 559
 560                 beta = betatable[av_clip(qp + beta_offset, 0, MAX_QP)];
 561                 tc[0]   = bs0 ? TC_CALC(qp, bs0) : 0;
 562                 tc[1]   = bs1 ? TC_CALC(qp, bs1) : 0;
 563                 src     = &s->frame->data[LUMA][y * s->frame->linesize[LUMA] + (x << s->ps.sps->pixel_shift)];
 564                 if (pcmf) {
 565                     no_p[0] = get_pcm(s, x, y - 1);
 566                     no_p[1] = get_pcm(s, x + 4, y - 1);
 567                     no_q[0] = get_pcm(s, x, y);
 568                     no_q[1] = get_pcm(s, x + 4, y);
 569                     s->hevcdsp.hevc_h_loop_filter_luma_c(src,
 570                                                          s->frame->linesize[LUMA],
 571                                                          beta, tc, no_p, no_q);
 572                 } else
 573                     s->hevcdsp.hevc_h_loop_filter_luma(src,
 574                                                        s->frame->linesize[LUMA],
 575                                                        beta, tc, no_p, no_q);
 576             }
 577         }
 578     }
 579
 580     if (s->ps.sps->chroma_format_idc) {
 581         for (chroma = 1; chroma <= 2; chroma++) {
 582             int h = 1 << s->ps.sps->hshift[chroma];
 583             int v = 1 << s->ps.sps->vshift[chroma];
 584
 585             // vertical filtering chroma
 586             for (y = y0; y < y_end; y += (8 * v)) {
 587                 for (x = x0 ? x0 : 8 * h; x < x_end; x += (8 * h)) {
 588                     const int bs0 = s->vertical_bs[(x +  y            * s->bs_width) >> 2];
 589                     const int bs1 = s->vertical_bs[(x + (y + (4 * v)) * s->bs_width) >> 2];
 590
 591                     if ((bs0 == 2) || (bs1 == 2)) {
 592                         const int qp0 = (get_qPy(s, x - 1, y)           + get_qPy(s, x, y)           + 1) >> 1;
 593                         const int qp1 = (get_qPy(s, x - 1, y + (4 * v)) + get_qPy(s, x, y + (4 * v)) + 1) >> 1;
 594
 595                         c_tc[0] = (bs0 == 2) ? chroma_tc(s, qp0, chroma, tc_offset) : 0;
 596                         c_tc[1] = (bs1 == 2) ? chroma_tc(s, qp1, chroma, tc_offset) : 0;
 597                         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)];
 598                         if (pcmf) {
 599                             no_p[0] = get_pcm(s, x - 1, y);
 600                             no_p[1] = get_pcm(s, x - 1, y + (4 * v));
 601                             no_q[0] = get_pcm(s, x, y);
 602                             no_q[1] = get_pcm(s, x, y + (4 * v));
 603                             s->hevcdsp.hevc_v_loop_filter_chroma_c(src,
 604                                                                    s->frame->linesize[chroma],
 605                                                                    c_tc, no_p, no_q);
 606                         } else
 607                             s->hevcdsp.hevc_v_loop_filter_chroma(src,
 608                                                                  s->frame->linesize[chroma],
 609                                                                  c_tc, no_p, no_q);
 610                     }
 611                 }
 612
 613                 if(!y)
 614                     continue;
 615
 616                 // horizontal filtering chroma
 617                 tc_offset = x0 ? left_tc_offset : cur_tc_offset;
 618                 x_end2 = x_end;
 619                 if (x_end != s->ps.sps->width)
 620                     x_end2 = x_end - 8 * h;
 621                 for (x = x0 ? x0 - 8 * h : 0; x < x_end2; x += (8 * h)) {
 622                     const int bs0 = s->horizontal_bs[( x          + y * s->bs_width) >> 2];
 623                     const int bs1 = s->horizontal_bs[((x + 4 * h) + y * s->bs_width) >> 2];
 624                     if ((bs0 == 2) || (bs1 == 2)) {
 625                         const int qp0 = bs0 == 2 ? (get_qPy(s, x,           y - 1) + get_qPy(s, x,           y) + 1) >> 1 : 0;
 626                         const int qp1 = bs1 == 2 ? (get_qPy(s, x + (4 * h), y - 1) + get_qPy(s, x + (4 * h), y) + 1) >> 1 : 0;
 627
 628                         c_tc[0]   = bs0 == 2 ? chroma_tc(s, qp0, chroma, tc_offset)     : 0;
 629                         c_tc[1]   = bs1 == 2 ? chroma_tc(s, qp1, chroma, cur_tc_offset) : 0;
 630                         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)];
 631                         if (pcmf) {
 632                             no_p[0] = get_pcm(s, x,           y - 1);
 633                             no_p[1] = get_pcm(s, x + (4 * h), y - 1);
 634                             no_q[0] = get_pcm(s, x,           y);
 635                             no_q[1] = get_pcm(s, x + (4 * h), y);
 636                             s->hevcdsp.hevc_h_loop_filter_chroma_c(src,
 637                                                                    s->frame->linesize[chroma],
 638                                                                    c_tc, no_p, no_q);
 639                         } else
 640                             s->hevcdsp.hevc_h_loop_filter_chroma(src,
 641                                                                  s->frame->linesize[chroma],
 642                                                                  c_tc, no_p, no_q);
 643                     }
 644                 }
 645             }
 646         }
 647     }
 648 }
 649
 650 static int boundary_strength(HEVCContext *s, MvField *curr, MvField *neigh,
 651                              RefPicList *neigh_refPicList)
 652 {
 653     if (curr->pred_flag == PF_BI &&  neigh->pred_flag == PF_BI) {
 654         // same L0 and L1
 655         if (s->ref->refPicList[0].list[curr->ref_idx[0]] == neigh_refPicList[0].list[neigh->ref_idx[0]]  &&
 656             s->ref->refPicList[0].list[curr->ref_idx[0]] == s->ref->refPicList[1].list[curr->ref_idx[1]] &&
 657             neigh_refPicList[0].list[neigh->ref_idx[0]] == neigh_refPicList[1].list[neigh->ref_idx[1]]) {
 658             if ((FFABS(neigh->mv[0].x - curr->mv[0].x) >= 4 || FFABS(neigh->mv[0].y - curr->mv[0].y) >= 4 ||
 659                  FFABS(neigh->mv[1].x - curr->mv[1].x) >= 4 || FFABS(neigh->mv[1].y - curr->mv[1].y) >= 4) &&
 660                 (FFABS(neigh->mv[1].x - curr->mv[0].x) >= 4 || FFABS(neigh->mv[1].y - curr->mv[0].y) >= 4 ||
 661                  FFABS(neigh->mv[0].x - curr->mv[1].x) >= 4 || FFABS(neigh->mv[0].y - curr->mv[1].y) >= 4))
 662                 return 1;
 663             else
 664                 return 0;
 665         } else if (neigh_refPicList[0].list[neigh->ref_idx[0]] == s->ref->refPicList[0].list[curr->ref_idx[0]] &&
 666                    neigh_refPicList[1].list[neigh->ref_idx[1]] == s->ref->refPicList[1].list[curr->ref_idx[1]]) {
 667             if (FFABS(neigh->mv[0].x - curr->mv[0].x) >= 4 || FFABS(neigh->mv[0].y - curr->mv[0].y) >= 4 ||
 668                 FFABS(neigh->mv[1].x - curr->mv[1].x) >= 4 || FFABS(neigh->mv[1].y - curr->mv[1].y) >= 4)
 669                 return 1;
 670             else
 671                 return 0;
 672         } else if (neigh_refPicList[1].list[neigh->ref_idx[1]] == s->ref->refPicList[0].list[curr->ref_idx[0]] &&
 673                    neigh_refPicList[0].list[neigh->ref_idx[0]] == s->ref->refPicList[1].list[curr->ref_idx[1]]) {
 674             if (FFABS(neigh->mv[1].x - curr->mv[0].x) >= 4 || FFABS(neigh->mv[1].y - curr->mv[0].y) >= 4 ||
 675                 FFABS(neigh->mv[0].x - curr->mv[1].x) >= 4 || FFABS(neigh->mv[0].y - curr->mv[1].y) >= 4)
 676                 return 1;
 677             else
 678                 return 0;
 679         } else {
 680             return 1;
 681         }
 682     } else if ((curr->pred_flag != PF_BI) && (neigh->pred_flag != PF_BI)){ // 1 MV
 683         Mv A, B;
 684         int ref_A, ref_B;
 685
 686         if (curr->pred_flag & 1) {
 687             A     = curr->mv[0];
 688             ref_A = s->ref->refPicList[0].list[curr->ref_idx[0]];
 689         } else {
 690             A     = curr->mv[1];
 691             ref_A = s->ref->refPicList[1].list[curr->ref_idx[1]];
 692         }
 693
 694         if (neigh->pred_flag & 1) {
 695             B     = neigh->mv[0];
 696             ref_B = neigh_refPicList[0].list[neigh->ref_idx[0]];
 697         } else {
 698             B     = neigh->mv[1];
 699             ref_B = neigh_refPicList[1].list[neigh->ref_idx[1]];
 700         }
 701
 702         if (ref_A == ref_B) {
 703             if (FFABS(A.x - B.x) >= 4 || FFABS(A.y - B.y) >= 4)
 704                 return 1;
 705             else
 706                 return 0;
 707         } else
 708             return 1;
 709     }
 710
 711     return 1;
 712 }
 713
 714 void ff_hevc_deblocking_boundary_strengths(HEVCContext *s, int x0, int y0,
 715                                            int log2_trafo_size)
 716 {
 717     HEVCLocalContext *lc = s->HEVClc;
 718     MvField *tab_mvf     = s->ref->tab_mvf;
 719     int log2_min_pu_size = s->ps.sps->log2_min_pu_size;
 720     int log2_min_tu_size = s->ps.sps->log2_min_tb_size;
 721     int min_pu_width     = s->ps.sps->min_pu_width;
 722     int min_tu_width     = s->ps.sps->min_tb_width;
 723     int is_intra = tab_mvf[(y0 >> log2_min_pu_size) * min_pu_width +
 724                            (x0 >> log2_min_pu_size)].pred_flag == PF_INTRA;
 725     int boundary_upper, boundary_left;
 726     int i, j, bs;
 727
 728     boundary_upper = y0 > 0 && !(y0 & 7);
 729     if (boundary_upper &&
 730         ((!s->sh.slice_loop_filter_across_slices_enabled_flag &&
 731           lc->boundary_flags & BOUNDARY_UPPER_SLICE &&
 732           (y0 % (1 << s->ps.sps->log2_ctb_size)) == 0) ||
 733          (!s->ps.pps->loop_filter_across_tiles_enabled_flag &&
 734           lc->boundary_flags & BOUNDARY_UPPER_TILE &&
 735           (y0 % (1 << s->ps.sps->log2_ctb_size)) == 0)))
 736         boundary_upper = 0;
 737
 738     if (boundary_upper) {
 739         RefPicList *rpl_top = (lc->boundary_flags & BOUNDARY_UPPER_SLICE) ?
 740                               ff_hevc_get_ref_list(s, s->ref, x0, y0 - 1) :
 741                               s->ref->refPicList;
 742         int yp_pu = (y0 - 1) >> log2_min_pu_size;
 743         int yq_pu =  y0      >> log2_min_pu_size;
 744         int yp_tu = (y0 - 1) >> log2_min_tu_size;
 745         int yq_tu =  y0      >> log2_min_tu_size;
 746
 747             for (i = 0; i < (1 << log2_trafo_size); i += 4) {
 748                 int x_pu = (x0 + i) >> log2_min_pu_size;
 749                 int x_tu = (x0 + i) >> log2_min_tu_size;
 750                 MvField *top  = &tab_mvf[yp_pu * min_pu_width + x_pu];
 751                 MvField *curr = &tab_mvf[yq_pu * min_pu_width + x_pu];
 752                 uint8_t top_cbf_luma  = s->cbf_luma[yp_tu * min_tu_width + x_tu];
 753                 uint8_t curr_cbf_luma = s->cbf_luma[yq_tu * min_tu_width + x_tu];
 754
 755                 if (curr->pred_flag == PF_INTRA || top->pred_flag == PF_INTRA)
 756                     bs = 2;
 757                 else if (curr_cbf_luma || top_cbf_luma)
 758                     bs = 1;
 759                 else
 760                     bs = boundary_strength(s, curr, top, rpl_top);
 761                 s->horizontal_bs[((x0 + i) + y0 * s->bs_width) >> 2] = bs;
 762             }
 763     }
 764
 765     // bs for vertical TU boundaries
 766     boundary_left = x0 > 0 && !(x0 & 7);
 767     if (boundary_left &&
 768         ((!s->sh.slice_loop_filter_across_slices_enabled_flag &&
 769           lc->boundary_flags & BOUNDARY_LEFT_SLICE &&
 770           (x0 % (1 << s->ps.sps->log2_ctb_size)) == 0) ||
 771          (!s->ps.pps->loop_filter_across_tiles_enabled_flag &&
 772           lc->boundary_flags & BOUNDARY_LEFT_TILE &&
 773           (x0 % (1 << s->ps.sps->log2_ctb_size)) == 0)))
 774         boundary_left = 0;
 775
 776     if (boundary_left) {
 777         RefPicList *rpl_left = (lc->boundary_flags & BOUNDARY_LEFT_SLICE) ?
 778                                ff_hevc_get_ref_list(s, s->ref, x0 - 1, y0) :
 779                                s->ref->refPicList;
 780         int xp_pu = (x0 - 1) >> log2_min_pu_size;
 781         int xq_pu =  x0      >> log2_min_pu_size;
 782         int xp_tu = (x0 - 1) >> log2_min_tu_size;
 783         int xq_tu =  x0      >> log2_min_tu_size;
 784
 785             for (i = 0; i < (1 << log2_trafo_size); i += 4) {
 786                 int y_pu      = (y0 + i) >> log2_min_pu_size;
 787                 int y_tu      = (y0 + i) >> log2_min_tu_size;
 788                 MvField *left = &tab_mvf[y_pu * min_pu_width + xp_pu];
 789                 MvField *curr = &tab_mvf[y_pu * min_pu_width + xq_pu];
 790                 uint8_t left_cbf_luma = s->cbf_luma[y_tu * min_tu_width + xp_tu];
 791                 uint8_t curr_cbf_luma = s->cbf_luma[y_tu * min_tu_width + xq_tu];
 792
 793                 if (curr->pred_flag == PF_INTRA || left->pred_flag == PF_INTRA)
 794                     bs = 2;
 795                 else if (curr_cbf_luma || left_cbf_luma)
 796                     bs = 1;
 797                 else
 798                     bs = boundary_strength(s, curr, left, rpl_left);
 799                 s->vertical_bs[(x0 + (y0 + i) * s->bs_width) >> 2] = bs;
 800             }
 801     }
 802
 803     if (log2_trafo_size > log2_min_pu_size && !is_intra) {
 804         RefPicList *rpl = s->ref->refPicList;
 805
 806         // bs for TU internal horizontal PU boundaries
 807         for (j = 8; j < (1 << log2_trafo_size); j += 8) {
 808             int yp_pu = (y0 + j - 1) >> log2_min_pu_size;
 809             int yq_pu = (y0 + j)     >> log2_min_pu_size;
 810
 811             for (i = 0; i < (1 << log2_trafo_size); i += 4) {
 812                 int x_pu = (x0 + i) >> log2_min_pu_size;
 813                 MvField *top  = &tab_mvf[yp_pu * min_pu_width + x_pu];
 814                 MvField *curr = &tab_mvf[yq_pu * min_pu_width + x_pu];
 815
 816                 bs = boundary_strength(s, curr, top, rpl);
 817                 s->horizontal_bs[((x0 + i) + (y0 + j) * s->bs_width) >> 2] = bs;
 818             }
 819         }
 820
 821         // bs for TU internal vertical PU boundaries
 822         for (j = 0; j < (1 << log2_trafo_size); j += 4) {
 823             int y_pu = (y0 + j) >> log2_min_pu_size;
 824
 825             for (i = 8; i < (1 << log2_trafo_size); i += 8) {
 826                 int xp_pu = (x0 + i - 1) >> log2_min_pu_size;
 827                 int xq_pu = (x0 + i)     >> log2_min_pu_size;
 828                 MvField *left = &tab_mvf[y_pu * min_pu_width + xp_pu];
 829                 MvField *curr = &tab_mvf[y_pu * min_pu_width + xq_pu];
 830
 831                 bs = boundary_strength(s, curr, left, rpl);
 832                 s->vertical_bs[((x0 + i) + (y0 + j) * s->bs_width) >> 2] = bs;
 833             }
 834         }
 835     }
 836 }
 837
 838 #undef LUMA
 839 #undef CB
 840 #undef CR
 841
 842 void ff_hevc_hls_filter(HEVCContext *s, int x, int y, int ctb_size)
 843 {
 844     int x_end = x >= s->ps.sps->width  - ctb_size;
 845     int skip = 0;
 846     if (s->avctx->skip_loop_filter >= AVDISCARD_ALL ||
 847         (s->avctx->skip_loop_filter >= AVDISCARD_NONKEY && !IS_IDR(s)) ||
 848         (s->avctx->skip_loop_filter >= AVDISCARD_NONINTRA &&
 849          s->sh.slice_type != HEVC_SLICE_I) ||
 850         (s->avctx->skip_loop_filter >= AVDISCARD_BIDIR &&
 851          s->sh.slice_type == HEVC_SLICE_B) ||
 852         (s->avctx->skip_loop_filter >= AVDISCARD_NONREF &&
 853         ff_hevc_nal_is_nonref(s->nal_unit_type)))
 854         skip = 1;
 855
 856     if (!skip)
 857         deblocking_filter_CTB(s, x, y);
 858     if (s->ps.sps->sao_enabled && !skip) {
 859         int y_end = y >= s->ps.sps->height - ctb_size;
 860         if (y && x)
 861             sao_filter_CTB(s, x - ctb_size, y - ctb_size);
 862         if (x && y_end)
 863             sao_filter_CTB(s, x - ctb_size, y);
 864         if (y && x_end) {
 865             sao_filter_CTB(s, x, y - ctb_size);
 866             if (s->threads_type & FF_THREAD_FRAME )
 867                 ff_thread_report_progress(&s->ref->tf, y, 0);
 868         }
 869         if (x_end && y_end) {
 870             sao_filter_CTB(s, x , y);
 871             if (s->threads_type & FF_THREAD_FRAME )
 872                 ff_thread_report_progress(&s->ref->tf, y + ctb_size, 0);
 873         }
 874     } else if (s->threads_type & FF_THREAD_FRAME && x_end)
 875         ff_thread_report_progress(&s->ref->tf, y + ctb_size - 4, 0);
 876 }
 877
 878 void ff_hevc_hls_filters(HEVCContext *s, int x_ctb, int y_ctb, int ctb_size)
 879 {
 880     int x_end = x_ctb >= s->ps.sps->width  - ctb_size;
 881     int y_end = y_ctb >= s->ps.sps->height - ctb_size;
 882     if (y_ctb && x_ctb)
 883         ff_hevc_hls_filter(s, x_ctb - ctb_size, y_ctb - ctb_size, ctb_size);
 884     if (y_ctb && x_end)
 885         ff_hevc_hls_filter(s, x_ctb, y_ctb - ctb_size, ctb_size);
 886     if (x_ctb && y_end)
 887         ff_hevc_hls_filter(s, x_ctb - ctb_size, y_ctb, ctb_size);
 888 }