/*
  * VP9 compatible video decoder
  *
  * Copyright (C) 2013 Ronald S. Bultje <rsbultje gmail com>
  * Copyright (C) 2013 Clément Bœsch <u pkh me>
  *
  * 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/avassert.h"
 
 #include "avcodec.h"
 #include "internal.h"
 #include "videodsp.h"
 #include "vp9data.h"
 #include "vp9dec.h"
 

 static av_always_inline int check_intra_mode(VP9TileData *td, int mode, uint8_t **a,

                                              uint8_t *dst_edge, ptrdiff_t stride_edge,
                                              uint8_t *dst_inner, ptrdiff_t stride_inner,
                                              uint8_t *l, int col, int x, int w,
                                              int row, int y, enum TxfmMode tx,
                                              int p, int ss_h, int ss_v, int bytesperpixel)
 {

     VP9Context *s = td->s;

     int have_top = row > 0 || y > 0;

     int have_left = col > td->tile_col_start || x > 0;

     int have_right = x < w - 1;
     int bpp = s->s.h.bpp;
     static const uint8_t mode_conv[10][2 /* have_left */][2 /* have_top */] = {
         [VERT_PRED]            = { { DC_127_PRED,          VERT_PRED            },
                                    { DC_127_PRED,          VERT_PRED            } },
         [HOR_PRED]             = { { DC_129_PRED,          DC_129_PRED          },
                                    { HOR_PRED,             HOR_PRED             } },
         [DC_PRED]              = { { DC_128_PRED,          TOP_DC_PRED          },
                                    { LEFT_DC_PRED,         DC_PRED              } },
         [DIAG_DOWN_LEFT_PRED]  = { { DC_127_PRED,          DIAG_DOWN_LEFT_PRED  },
                                    { DC_127_PRED,          DIAG_DOWN_LEFT_PRED  } },
         [DIAG_DOWN_RIGHT_PRED] = { { DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_RIGHT_PRED },
                                    { DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_RIGHT_PRED } },
         [VERT_RIGHT_PRED]      = { { VERT_RIGHT_PRED,      VERT_RIGHT_PRED      },
                                    { VERT_RIGHT_PRED,      VERT_RIGHT_PRED      } },
         [HOR_DOWN_PRED]        = { { HOR_DOWN_PRED,        HOR_DOWN_PRED        },
                                    { HOR_DOWN_PRED,        HOR_DOWN_PRED        } },
         [VERT_LEFT_PRED]       = { { DC_127_PRED,          VERT_LEFT_PRED       },
                                    { DC_127_PRED,          VERT_LEFT_PRED       } },
         [HOR_UP_PRED]          = { { DC_129_PRED,          DC_129_PRED          },
                                    { HOR_UP_PRED,          HOR_UP_PRED          } },
         [TM_VP8_PRED]          = { { DC_129_PRED,          VERT_PRED            },
                                    { HOR_PRED,             TM_VP8_PRED          } },
     };
     static const struct {
         uint8_t needs_left:1;
         uint8_t needs_top:1;
         uint8_t needs_topleft:1;
         uint8_t needs_topright:1;
         uint8_t invert_left:1;
     } edges[N_INTRA_PRED_MODES] = {
         [VERT_PRED]            = { .needs_top  = 1 },
         [HOR_PRED]             = { .needs_left = 1 },
         [DC_PRED]              = { .needs_top  = 1, .needs_left = 1 },
         [DIAG_DOWN_LEFT_PRED]  = { .needs_top  = 1, .needs_topright = 1 },
         [DIAG_DOWN_RIGHT_PRED] = { .needs_left = 1, .needs_top = 1,
                                    .needs_topleft = 1 },
         [VERT_RIGHT_PRED]      = { .needs_left = 1, .needs_top = 1,
                                    .needs_topleft = 1 },
         [HOR_DOWN_PRED]        = { .needs_left = 1, .needs_top = 1,
                                    .needs_topleft = 1 },
         [VERT_LEFT_PRED]       = { .needs_top  = 1, .needs_topright = 1 },
         [HOR_UP_PRED]          = { .needs_left = 1, .invert_left = 1 },
         [TM_VP8_PRED]          = { .needs_left = 1, .needs_top = 1,
                                    .needs_topleft = 1 },
         [LEFT_DC_PRED]         = { .needs_left = 1 },
         [TOP_DC_PRED]          = { .needs_top  = 1 },
         [DC_128_PRED]          = { 0 },
         [DC_127_PRED]          = { 0 },
         [DC_129_PRED]          = { 0 }
     };
 
     av_assert2(mode >= 0 && mode < 10);
     mode = mode_conv[mode][have_left][have_top];
     if (edges[mode].needs_top) {
         uint8_t *top, *topleft;
         int n_px_need = 4 << tx, n_px_have = (((s->cols - col) << !ss_h) - x) * 4;
         int n_px_need_tr = 0;
 
         if (tx == TX_4X4 && edges[mode].needs_topright && have_right)
             n_px_need_tr = 4;
 
         // if top of sb64-row, use s->intra_pred_data[] instead of
         // dst[-stride] for intra prediction (it contains pre- instead of
         // post-loopfilter data)
         if (have_top) {
             top = !(row & 7) && !y ?
                 s->intra_pred_data[p] + (col * (8 >> ss_h) + x * 4) * bytesperpixel :
                 y == 0 ? &dst_edge[-stride_edge] : &dst_inner[-stride_inner];
             if (have_left)
                 topleft = !(row & 7) && !y ?
                     s->intra_pred_data[p] + (col * (8 >> ss_h) + x * 4) * bytesperpixel :
                     y == 0 || x == 0 ? &dst_edge[-stride_edge] :
                     &dst_inner[-stride_inner];
         }
 
         if (have_top &&
             (!edges[mode].needs_topleft || (have_left && top == topleft)) &&
             (tx != TX_4X4 || !edges[mode].needs_topright || have_right) &&
             n_px_need + n_px_need_tr <= n_px_have) {
             *a = top;
         } else {
             if (have_top) {
                 if (n_px_need <= n_px_have) {
                     memcpy(*a, top, n_px_need * bytesperpixel);
                 } else {
 #define memset_bpp(c, i1, v, i2, num) do { \
     if (bytesperpixel == 1) { \
         memset(&(c)[(i1)], (v)[(i2)], (num)); \
     } else { \
         int n, val = AV_RN16A(&(v)[(i2) * 2]); \
         for (n = 0; n < (num); n++) { \
             AV_WN16A(&(c)[((i1) + n) * 2], val); \
         } \
     } \
 } while (0)
                     memcpy(*a, top, n_px_have * bytesperpixel);
                     memset_bpp(*a, n_px_have, (*a), n_px_have - 1, n_px_need - n_px_have);
                 }
             } else {
 #define memset_val(c, val, num) do { \
     if (bytesperpixel == 1) { \
         memset((c), (val), (num)); \
     } else { \
         int n; \
         for (n = 0; n < (num); n++) { \
             AV_WN16A(&(c)[n * 2], (val)); \
         } \
     } \
 } while (0)
                 memset_val(*a, (128 << (bpp - 8)) - 1, n_px_need);
             }
             if (edges[mode].needs_topleft) {
                 if (have_left && have_top) {
 #define assign_bpp(c, i1, v, i2) do { \
     if (bytesperpixel == 1) { \
         (c)[(i1)] = (v)[(i2)]; \
     } else { \
         AV_COPY16(&(c)[(i1) * 2], &(v)[(i2) * 2]); \
     } \
 } while (0)
                     assign_bpp(*a, -1, topleft, -1);
                 } else {
 #define assign_val(c, i, v) do { \
     if (bytesperpixel == 1) { \
         (c)[(i)] = (v); \
     } else { \
         AV_WN16A(&(c)[(i) * 2], (v)); \
     } \
 } while (0)
                     assign_val((*a), -1, (128 << (bpp - 8)) + (have_top ? +1 : -1));
                 }
             }
             if (tx == TX_4X4 && edges[mode].needs_topright) {
                 if (have_top && have_right &&
                     n_px_need + n_px_need_tr <= n_px_have) {
                     memcpy(&(*a)[4 * bytesperpixel], &top[4 * bytesperpixel], 4 * bytesperpixel);
                 } else {
                     memset_bpp(*a, 4, *a, 3, 4);
                 }
             }
         }
     }
     if (edges[mode].needs_left) {
         if (have_left) {
             int n_px_need = 4 << tx, i, n_px_have = (((s->rows - row) << !ss_v) - y) * 4;
             uint8_t *dst = x == 0 ? dst_edge : dst_inner;
             ptrdiff_t stride = x == 0 ? stride_edge : stride_inner;
 
             if (edges[mode].invert_left) {
                 if (n_px_need <= n_px_have) {
                     for (i = 0; i < n_px_need; i++)
                         assign_bpp(l, i, &dst[i * stride], -1);
                 } else {
                     for (i = 0; i < n_px_have; i++)
                         assign_bpp(l, i, &dst[i * stride], -1);
                     memset_bpp(l, n_px_have, l, n_px_have - 1, n_px_need - n_px_have);
                 }
             } else {
                 if (n_px_need <= n_px_have) {
                     for (i = 0; i < n_px_need; i++)
                         assign_bpp(l, n_px_need - 1 - i, &dst[i * stride], -1);
                 } else {
                     for (i = 0; i < n_px_have; i++)
                         assign_bpp(l, n_px_need - 1 - i, &dst[i * stride], -1);
                     memset_bpp(l, 0, l, n_px_need - n_px_have, n_px_need - n_px_have);
                 }
             }
         } else {
             memset_val(l, (128 << (bpp - 8)) + 1, 4 << tx);
         }
     }
 
     return mode;
 }
 

 static av_always_inline void intra_recon(VP9TileData *td, ptrdiff_t y_off,

                                          ptrdiff_t uv_off, int bytesperpixel)
 {

     VP9Context *s = td->s;
     VP9Block *b = td->b;
     int row = td->row, col = td->col;

     int w4 = ff_vp9_bwh_tab[1][b->bs][0] << 1, step1d = 1 << b->tx, n;
     int h4 = ff_vp9_bwh_tab[1][b->bs][1] << 1, x, y, step = 1 << (b->tx * 2);
     int end_x = FFMIN(2 * (s->cols - col), w4);
     int end_y = FFMIN(2 * (s->rows - row), h4);
     int tx = 4 * s->s.h.lossless + b->tx, uvtx = b->uvtx + 4 * s->s.h.lossless;
     int uvstep1d = 1 << b->uvtx, p;

     uint8_t *dst = td->dst[0], *dst_r = s->s.frames[CUR_FRAME].tf.f->data[0] + y_off;

     LOCAL_ALIGNED_32(uint8_t, a_buf, [96]);
     LOCAL_ALIGNED_32(uint8_t, l, [64]);
 
     for (n = 0, y = 0; y < end_y; y += step1d) {
         uint8_t *ptr = dst, *ptr_r = dst_r;
         for (x = 0; x < end_x; x += step1d, ptr += 4 * step1d * bytesperpixel,
                                ptr_r += 4 * step1d * bytesperpixel, n += step) {
             int mode = b->mode[b->bs > BS_8x8 && b->tx == TX_4X4 ?
                                y * 2 + x : 0];
             uint8_t *a = &a_buf[32];
             enum TxfmType txtp = ff_vp9_intra_txfm_type[mode];

             int eob = b->skip ? 0 : b->tx > TX_8X8 ? AV_RN16A(&td->eob[n]) : td->eob[n];

             mode = check_intra_mode(td, mode, &a, ptr_r,

                                     s->s.frames[CUR_FRAME].tf.f->linesize[0],

                                     ptr, td->y_stride, l,

                                     col, x, w4, row, y, b->tx, 0, 0, 0, bytesperpixel);

             s->dsp.intra_pred[b->tx][mode](ptr, td->y_stride, l, a);

             if (eob)

                 s->dsp.itxfm_add[tx][txtp](ptr, td->y_stride,
                                            td->block + 16 * n * bytesperpixel, eob);

         }
         dst_r += 4 * step1d * s->s.frames[CUR_FRAME].tf.f->linesize[0];

         dst   += 4 * step1d * td->y_stride;

     }
 
     // U/V
     w4    >>= s->ss_h;
     end_x >>= s->ss_h;
     end_y >>= s->ss_v;
     step = 1 << (b->uvtx * 2);
     for (p = 0; p < 2; p++) {

         dst   = td->dst[1 + p];

         dst_r = s->s.frames[CUR_FRAME].tf.f->data[1 + p] + uv_off;
         for (n = 0, y = 0; y < end_y; y += uvstep1d) {
             uint8_t *ptr = dst, *ptr_r = dst_r;
             for (x = 0; x < end_x; x += uvstep1d, ptr += 4 * uvstep1d * bytesperpixel,
                                    ptr_r += 4 * uvstep1d * bytesperpixel, n += step) {
                 int mode = b->uvmode;
                 uint8_t *a = &a_buf[32];

                 int eob = b->skip ? 0 : b->uvtx > TX_8X8 ? AV_RN16A(&td->uveob[p][n]) : td->uveob[p][n];

                 mode = check_intra_mode(td, mode, &a, ptr_r,

                                         s->s.frames[CUR_FRAME].tf.f->linesize[1],

                                         ptr, td->uv_stride, l, col, x, w4, row, y,

                                         b->uvtx, p + 1, s->ss_h, s->ss_v, bytesperpixel);

                 s->dsp.intra_pred[b->uvtx][mode](ptr, td->uv_stride, l, a);

                 if (eob)

                     s->dsp.itxfm_add[uvtx][DCT_DCT](ptr, td->uv_stride,
                                                     td->uvblock[p] + 16 * n * bytesperpixel, eob);

             }
             dst_r += 4 * uvstep1d * s->s.frames[CUR_FRAME].tf.f->linesize[1];

             dst   += 4 * uvstep1d * td->uv_stride;

         }
     }
 }
 

 void ff_vp9_intra_recon_8bpp(VP9TileData *td, ptrdiff_t y_off, ptrdiff_t uv_off)

 {

     intra_recon(td, y_off, uv_off, 1);

 }
 

 void ff_vp9_intra_recon_16bpp(VP9TileData *td, ptrdiff_t y_off, ptrdiff_t uv_off)

 {

     intra_recon(td, y_off, uv_off, 2);

 }
 

 static av_always_inline void mc_luma_unscaled(VP9TileData *td, vp9_mc_func (*mc)[2],

                                               uint8_t *dst, ptrdiff_t dst_stride,
                                               const uint8_t *ref, ptrdiff_t ref_stride,
                                               ThreadFrame *ref_frame,
                                               ptrdiff_t y, ptrdiff_t x, const VP56mv *mv,
                                               int bw, int bh, int w, int h, int bytesperpixel)
 {

     VP9Context *s = td->s;

     int mx = mv->x, my = mv->y, th;
 
     y += my >> 3;
     x += mx >> 3;
     ref += y * ref_stride + x * bytesperpixel;
     mx &= 7;
     my &= 7;
     // FIXME bilinear filter only needs 0/1 pixels, not 3/4
     // we use +7 because the last 7 pixels of each sbrow can be changed in
     // the longest loopfilter of the next sbrow
     th = (y + bh + 4 * !!my + 7) >> 6;
     ff_thread_await_progress(ref_frame, FFMAX(th, 0), 0);
     // The arm/aarch64 _hv filters read one more row than what actually is
     // needed, so switch to emulated edge one pixel sooner vertically
     // (!!my * 5) than horizontally (!!mx * 4).
     if (x < !!mx * 3 || y < !!my * 3 ||
         x + !!mx * 4 > w - bw || y + !!my * 5 > h - bh) {

         s->vdsp.emulated_edge_mc(td->edge_emu_buffer,

                                  ref - !!my * 3 * ref_stride - !!mx * 3 * bytesperpixel,
                                  160, ref_stride,
                                  bw + !!mx * 7, bh + !!my * 7,
                                  x - !!mx * 3, y - !!my * 3, w, h);

         ref = td->edge_emu_buffer + !!my * 3 * 160 + !!mx * 3 * bytesperpixel;

         ref_stride = 160;
     }
     mc[!!mx][!!my](dst, dst_stride, ref, ref_stride, bh, mx << 1, my << 1);
 }
 

 static av_always_inline void mc_chroma_unscaled(VP9TileData *td, vp9_mc_func (*mc)[2],

                                                 uint8_t *dst_u, uint8_t *dst_v,
                                                 ptrdiff_t dst_stride,
                                                 const uint8_t *ref_u, ptrdiff_t src_stride_u,
                                                 const uint8_t *ref_v, ptrdiff_t src_stride_v,
                                                 ThreadFrame *ref_frame,
                                                 ptrdiff_t y, ptrdiff_t x, const VP56mv *mv,
                                                 int bw, int bh, int w, int h, int bytesperpixel)
 {

     VP9Context *s = td->s;

     int mx = mv->x * (1 << !s->ss_h), my = mv->y * (1 << !s->ss_v), th;
 
     y += my >> 4;
     x += mx >> 4;
     ref_u += y * src_stride_u + x * bytesperpixel;
     ref_v += y * src_stride_v + x * bytesperpixel;
     mx &= 15;
     my &= 15;
     // FIXME bilinear filter only needs 0/1 pixels, not 3/4
     // we use +7 because the last 7 pixels of each sbrow can be changed in
     // the longest loopfilter of the next sbrow
     th = (y + bh + 4 * !!my + 7) >> (6 - s->ss_v);
     ff_thread_await_progress(ref_frame, FFMAX(th, 0), 0);
     // The arm/aarch64 _hv filters read one more row than what actually is
     // needed, so switch to emulated edge one pixel sooner vertically
     // (!!my * 5) than horizontally (!!mx * 4).
     if (x < !!mx * 3 || y < !!my * 3 ||
         x + !!mx * 4 > w - bw || y + !!my * 5 > h - bh) {

         s->vdsp.emulated_edge_mc(td->edge_emu_buffer,

                                  ref_u - !!my * 3 * src_stride_u - !!mx * 3 * bytesperpixel,
                                  160, src_stride_u,
                                  bw + !!mx * 7, bh + !!my * 7,
                                  x - !!mx * 3, y - !!my * 3, w, h);

         ref_u = td->edge_emu_buffer + !!my * 3 * 160 + !!mx * 3 * bytesperpixel;

         mc[!!mx][!!my](dst_u, dst_stride, ref_u, 160, bh, mx, my);
 

         s->vdsp.emulated_edge_mc(td->edge_emu_buffer,

                                  ref_v - !!my * 3 * src_stride_v - !!mx * 3 * bytesperpixel,
                                  160, src_stride_v,
                                  bw + !!mx * 7, bh + !!my * 7,
                                  x - !!mx * 3, y - !!my * 3, w, h);

         ref_v = td->edge_emu_buffer + !!my * 3 * 160 + !!mx * 3 * bytesperpixel;

         mc[!!mx][!!my](dst_v, dst_stride, ref_v, 160, bh, mx, my);
     } else {
         mc[!!mx][!!my](dst_u, dst_stride, ref_u, src_stride_u, bh, mx, my);
         mc[!!mx][!!my](dst_v, dst_stride, ref_v, src_stride_v, bh, mx, my);
     }
 }
 

 #define mc_luma_dir(td, mc, dst, dst_ls, src, src_ls, tref, row, col, mv, \

                     px, py, pw, ph, bw, bh, w, h, i) \

     mc_luma_unscaled(td, s->dsp.mc, dst, dst_ls, src, src_ls, tref, row, col, \

                      mv, bw, bh, w, h, bytesperpixel)

 #define mc_chroma_dir(td, mc, dstu, dstv, dst_ls, srcu, srcu_ls, srcv, srcv_ls, tref, \

                       row, col, mv, px, py, pw, ph, bw, bh, w, h, i) \

     mc_chroma_unscaled(td, s->dsp.mc, dstu, dstv, dst_ls, srcu, srcu_ls, srcv, srcv_ls, tref, \

                        row, col, mv, bw, bh, w, h, bytesperpixel)
 #define SCALED 0
 #define FN(x) x##_8bpp
 #define BYTES_PER_PIXEL 1
 #include "vp9_mc_template.c"
 #undef FN
 #undef BYTES_PER_PIXEL
 #define FN(x) x##_16bpp
 #define BYTES_PER_PIXEL 2
 #include "vp9_mc_template.c"
 #undef mc_luma_dir
 #undef mc_chroma_dir
 #undef FN
 #undef BYTES_PER_PIXEL
 #undef SCALED
 

 static av_always_inline void mc_luma_scaled(VP9TileData *td, vp9_scaled_mc_func smc,

                                             vp9_mc_func (*mc)[2],
                                             uint8_t *dst, ptrdiff_t dst_stride,
                                             const uint8_t *ref, ptrdiff_t ref_stride,
                                             ThreadFrame *ref_frame,
                                             ptrdiff_t y, ptrdiff_t x, const VP56mv *in_mv,
                                             int px, int py, int pw, int ph,
                                             int bw, int bh, int w, int h, int bytesperpixel,
                                             const uint16_t *scale, const uint8_t *step)
 {

     VP9Context *s = td->s;

     if (s->s.frames[CUR_FRAME].tf.f->width == ref_frame->f->width &&
         s->s.frames[CUR_FRAME].tf.f->height == ref_frame->f->height) {

         mc_luma_unscaled(td, mc, dst, dst_stride, ref, ref_stride, ref_frame,

                          y, x, in_mv, bw, bh, w, h, bytesperpixel);
     } else {
 #define scale_mv(n, dim) (((int64_t)(n) * scale[dim]) >> 14)
     int mx, my;
     int refbw_m1, refbh_m1;
     int th;
     VP56mv mv;
 
     mv.x = av_clip(in_mv->x, -(x + pw - px + 4) * 8, (s->cols * 8 - x + px + 3) * 8);
     mv.y = av_clip(in_mv->y, -(y + ph - py + 4) * 8, (s->rows * 8 - y + py + 3) * 8);
     // BUG libvpx seems to scale the two components separately. This introduces
     // rounding errors but we have to reproduce them to be exactly compatible
     // with the output from libvpx...
     mx = scale_mv(mv.x * 2, 0) + scale_mv(x * 16, 0);
     my = scale_mv(mv.y * 2, 1) + scale_mv(y * 16, 1);
 
     y = my >> 4;
     x = mx >> 4;
     ref += y * ref_stride + x * bytesperpixel;
     mx &= 15;
     my &= 15;
     refbw_m1 = ((bw - 1) * step[0] + mx) >> 4;
     refbh_m1 = ((bh - 1) * step[1] + my) >> 4;
     // FIXME bilinear filter only needs 0/1 pixels, not 3/4
     // we use +7 because the last 7 pixels of each sbrow can be changed in
     // the longest loopfilter of the next sbrow
     th = (y + refbh_m1 + 4 + 7) >> 6;
     ff_thread_await_progress(ref_frame, FFMAX(th, 0), 0);
     // The arm/aarch64 _hv filters read one more row than what actually is
     // needed, so switch to emulated edge one pixel sooner vertically
     // (y + 5 >= h - refbh_m1) than horizontally (x + 4 >= w - refbw_m1).
     if (x < 3 || y < 3 || x + 4 >= w - refbw_m1 || y + 5 >= h - refbh_m1) {

         s->vdsp.emulated_edge_mc(td->edge_emu_buffer,

                                  ref - 3 * ref_stride - 3 * bytesperpixel,
                                  288, ref_stride,
                                  refbw_m1 + 8, refbh_m1 + 8,
                                  x - 3, y - 3, w, h);

         ref = td->edge_emu_buffer + 3 * 288 + 3 * bytesperpixel;

         ref_stride = 288;
     }
     smc(dst, dst_stride, ref, ref_stride, bh, mx, my, step[0], step[1]);
     }
 }
 

 static av_always_inline void mc_chroma_scaled(VP9TileData *td, vp9_scaled_mc_func smc,

                                               vp9_mc_func (*mc)[2],
                                               uint8_t *dst_u, uint8_t *dst_v,
                                               ptrdiff_t dst_stride,
                                               const uint8_t *ref_u, ptrdiff_t src_stride_u,
                                               const uint8_t *ref_v, ptrdiff_t src_stride_v,
                                               ThreadFrame *ref_frame,
                                               ptrdiff_t y, ptrdiff_t x, const VP56mv *in_mv,
                                               int px, int py, int pw, int ph,
                                               int bw, int bh, int w, int h, int bytesperpixel,
                                               const uint16_t *scale, const uint8_t *step)
 {

     VP9Context *s = td->s;

     if (s->s.frames[CUR_FRAME].tf.f->width == ref_frame->f->width &&
         s->s.frames[CUR_FRAME].tf.f->height == ref_frame->f->height) {

         mc_chroma_unscaled(td, mc, dst_u, dst_v, dst_stride, ref_u, src_stride_u,

                            ref_v, src_stride_v, ref_frame,
                            y, x, in_mv, bw, bh, w, h, bytesperpixel);
     } else {
     int mx, my;
     int refbw_m1, refbh_m1;
     int th;
     VP56mv mv;
 
     if (s->ss_h) {
         // BUG https://code.google.com/p/webm/issues/detail?id=820
         mv.x = av_clip(in_mv->x, -(x + pw - px + 4) * 16, (s->cols * 4 - x + px + 3) * 16);
         mx = scale_mv(mv.x, 0) + (scale_mv(x * 16, 0) & ~15) + (scale_mv(x * 32, 0) & 15);
     } else {
         mv.x = av_clip(in_mv->x, -(x + pw - px + 4) * 8, (s->cols * 8 - x + px + 3) * 8);
         mx = scale_mv(mv.x * 2, 0) + scale_mv(x * 16, 0);
     }
     if (s->ss_v) {
         // BUG https://code.google.com/p/webm/issues/detail?id=820
         mv.y = av_clip(in_mv->y, -(y + ph - py + 4) * 16, (s->rows * 4 - y + py + 3) * 16);
         my = scale_mv(mv.y, 1) + (scale_mv(y * 16, 1) & ~15) + (scale_mv(y * 32, 1) & 15);
     } else {
         mv.y = av_clip(in_mv->y, -(y + ph - py + 4) * 8, (s->rows * 8 - y + py + 3) * 8);
         my = scale_mv(mv.y * 2, 1) + scale_mv(y * 16, 1);
     }
 #undef scale_mv
     y = my >> 4;
     x = mx >> 4;
     ref_u += y * src_stride_u + x * bytesperpixel;
     ref_v += y * src_stride_v + x * bytesperpixel;
     mx &= 15;
     my &= 15;
     refbw_m1 = ((bw - 1) * step[0] + mx) >> 4;
     refbh_m1 = ((bh - 1) * step[1] + my) >> 4;
     // FIXME bilinear filter only needs 0/1 pixels, not 3/4
     // we use +7 because the last 7 pixels of each sbrow can be changed in
     // the longest loopfilter of the next sbrow
     th = (y + refbh_m1 + 4 + 7) >> (6 - s->ss_v);
     ff_thread_await_progress(ref_frame, FFMAX(th, 0), 0);
     // The arm/aarch64 _hv filters read one more row than what actually is
     // needed, so switch to emulated edge one pixel sooner vertically
     // (y + 5 >= h - refbh_m1) than horizontally (x + 4 >= w - refbw_m1).
     if (x < 3 || y < 3 || x + 4 >= w - refbw_m1 || y + 5 >= h - refbh_m1) {

         s->vdsp.emulated_edge_mc(td->edge_emu_buffer,

                                  ref_u - 3 * src_stride_u - 3 * bytesperpixel,
                                  288, src_stride_u,
                                  refbw_m1 + 8, refbh_m1 + 8,
                                  x - 3, y - 3, w, h);

         ref_u = td->edge_emu_buffer + 3 * 288 + 3 * bytesperpixel;

         smc(dst_u, dst_stride, ref_u, 288, bh, mx, my, step[0], step[1]);
 

         s->vdsp.emulated_edge_mc(td->edge_emu_buffer,

                                  ref_v - 3 * src_stride_v - 3 * bytesperpixel,
                                  288, src_stride_v,
                                  refbw_m1 + 8, refbh_m1 + 8,
                                  x - 3, y - 3, w, h);

         ref_v = td->edge_emu_buffer + 3 * 288 + 3 * bytesperpixel;

         smc(dst_v, dst_stride, ref_v, 288, bh, mx, my, step[0], step[1]);
     } else {
         smc(dst_u, dst_stride, ref_u, src_stride_u, bh, mx, my, step[0], step[1]);
         smc(dst_v, dst_stride, ref_v, src_stride_v, bh, mx, my, step[0], step[1]);
     }
     }
 }
 

 #define mc_luma_dir(td, mc, dst, dst_ls, src, src_ls, tref, row, col, mv, \

                     px, py, pw, ph, bw, bh, w, h, i) \

     mc_luma_scaled(td, s->dsp.s##mc, s->dsp.mc, dst, dst_ls, src, src_ls, tref, row, col, \

                    mv, px, py, pw, ph, bw, bh, w, h, bytesperpixel, \
                    s->mvscale[b->ref[i]], s->mvstep[b->ref[i]])

 #define mc_chroma_dir(td, mc, dstu, dstv, dst_ls, srcu, srcu_ls, srcv, srcv_ls, tref, \

                       row, col, mv, px, py, pw, ph, bw, bh, w, h, i) \

     mc_chroma_scaled(td, s->dsp.s##mc, s->dsp.mc, dstu, dstv, dst_ls, srcu, srcu_ls, srcv, srcv_ls, tref, \

                      row, col, mv, px, py, pw, ph, bw, bh, w, h, bytesperpixel, \
                      s->mvscale[b->ref[i]], s->mvstep[b->ref[i]])
 #define SCALED 1
 #define FN(x) x##_scaled_8bpp
 #define BYTES_PER_PIXEL 1
 #include "vp9_mc_template.c"
 #undef FN
 #undef BYTES_PER_PIXEL
 #define FN(x) x##_scaled_16bpp
 #define BYTES_PER_PIXEL 2
 #include "vp9_mc_template.c"
 #undef mc_luma_dir
 #undef mc_chroma_dir
 #undef FN
 #undef BYTES_PER_PIXEL
 #undef SCALED
 

 static av_always_inline void inter_recon(VP9TileData *td, int bytesperpixel)

 {

     VP9Context *s = td->s;
     VP9Block *b = td->b;
     int row = td->row, col = td->col;

 
     if (s->mvscale[b->ref[0]][0] || (b->comp && s->mvscale[b->ref[1]][0])) {
         if (bytesperpixel == 1) {

             inter_pred_scaled_8bpp(td);

         } else {

             inter_pred_scaled_16bpp(td);

         }
     } else {
         if (bytesperpixel == 1) {

             inter_pred_8bpp(td);

         } else {

             inter_pred_16bpp(td);

         }
     }
 
     if (!b->skip) {
         /* mostly copied intra_recon() */
 
         int w4 = ff_vp9_bwh_tab[1][b->bs][0] << 1, step1d = 1 << b->tx, n;
         int h4 = ff_vp9_bwh_tab[1][b->bs][1] << 1, x, y, step = 1 << (b->tx * 2);
         int end_x = FFMIN(2 * (s->cols - col), w4);
         int end_y = FFMIN(2 * (s->rows - row), h4);
         int tx = 4 * s->s.h.lossless + b->tx, uvtx = b->uvtx + 4 * s->s.h.lossless;
         int uvstep1d = 1 << b->uvtx, p;

         uint8_t *dst = td->dst[0];

 
         // y itxfm add
         for (n = 0, y = 0; y < end_y; y += step1d) {
             uint8_t *ptr = dst;
             for (x = 0; x < end_x; x += step1d,
                  ptr += 4 * step1d * bytesperpixel, n += step) {

                 int eob = b->tx > TX_8X8 ? AV_RN16A(&td->eob[n]) : td->eob[n];

 
                 if (eob)

                     s->dsp.itxfm_add[tx][DCT_DCT](ptr, td->y_stride,
                                                   td->block + 16 * n * bytesperpixel, eob);

             }

             dst += 4 * td->y_stride * step1d;

         }
 
         // uv itxfm add
         end_x >>= s->ss_h;
         end_y >>= s->ss_v;
         step = 1 << (b->uvtx * 2);
         for (p = 0; p < 2; p++) {

             dst = td->dst[p + 1];

             for (n = 0, y = 0; y < end_y; y += uvstep1d) {
                 uint8_t *ptr = dst;
                 for (x = 0; x < end_x; x += uvstep1d,
                      ptr += 4 * uvstep1d * bytesperpixel, n += step) {

                     int eob = b->uvtx > TX_8X8 ? AV_RN16A(&td->uveob[p][n]) : td->uveob[p][n];

 
                     if (eob)

                         s->dsp.itxfm_add[uvtx][DCT_DCT](ptr, td->uv_stride,
                                                         td->uvblock[p] + 16 * n * bytesperpixel, eob);

                 }

                 dst += 4 * uvstep1d * td->uv_stride;

             }
         }
     }
 }
 

 void ff_vp9_inter_recon_8bpp(VP9TileData *td)

 {

     inter_recon(td, 1);

 }
 

 void ff_vp9_inter_recon_16bpp(VP9TileData *td)

 {

     inter_recon(td, 2);

 }