1/*
2 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#include <assert.h>
12
13#include "./vpx_scale_rtcd.h"
14#include "./vpx_config.h"
15
16#include "vpx/vpx_integer.h"
17
18#include "vp9/common/vp9_blockd.h"
19#include "vp9/common/vp9_reconinter.h"
20#include "vp9/common/vp9_reconintra.h"
21
22#if CONFIG_VP9_HIGHBITDEPTH
23void high_inter_predictor(const uint8_t *src, int src_stride,
24                                 uint8_t *dst, int dst_stride,
25                                 const int subpel_x,
26                                 const int subpel_y,
27                                 const struct scale_factors *sf,
28                                 int w, int h, int ref,
29                                 const InterpKernel *kernel,
30                                 int xs, int ys, int bd) {
31  sf->highbd_predict[subpel_x != 0][subpel_y != 0][ref](
32      src, src_stride, dst, dst_stride,
33      kernel[subpel_x], xs, kernel[subpel_y], ys, w, h, bd);
34}
35
36void vp9_highbd_build_inter_predictor(const uint8_t *src, int src_stride,
37                                      uint8_t *dst, int dst_stride,
38                                      const MV *src_mv,
39                                      const struct scale_factors *sf,
40                                      int w, int h, int ref,
41                                      const InterpKernel *kernel,
42                                      enum mv_precision precision,
43                                      int x, int y, int bd) {
44  const int is_q4 = precision == MV_PRECISION_Q4;
45  const MV mv_q4 = { is_q4 ? src_mv->row : src_mv->row * 2,
46                     is_q4 ? src_mv->col : src_mv->col * 2 };
47  MV32 mv = vp9_scale_mv(&mv_q4, x, y, sf);
48  const int subpel_x = mv.col & SUBPEL_MASK;
49  const int subpel_y = mv.row & SUBPEL_MASK;
50
51  src += (mv.row >> SUBPEL_BITS) * src_stride + (mv.col >> SUBPEL_BITS);
52
53  high_inter_predictor(src, src_stride, dst, dst_stride, subpel_x, subpel_y,
54                       sf, w, h, ref, kernel, sf->x_step_q4, sf->y_step_q4, bd);
55}
56#endif  // CONFIG_VP9_HIGHBITDEPTH
57
58void vp9_build_inter_predictor(const uint8_t *src, int src_stride,
59                               uint8_t *dst, int dst_stride,
60                               const MV *src_mv,
61                               const struct scale_factors *sf,
62                               int w, int h, int ref,
63                               const InterpKernel *kernel,
64                               enum mv_precision precision,
65                               int x, int y) {
66  const int is_q4 = precision == MV_PRECISION_Q4;
67  const MV mv_q4 = { is_q4 ? src_mv->row : src_mv->row * 2,
68                     is_q4 ? src_mv->col : src_mv->col * 2 };
69  MV32 mv = vp9_scale_mv(&mv_q4, x, y, sf);
70  const int subpel_x = mv.col & SUBPEL_MASK;
71  const int subpel_y = mv.row & SUBPEL_MASK;
72
73  src += (mv.row >> SUBPEL_BITS) * src_stride + (mv.col >> SUBPEL_BITS);
74
75  inter_predictor(src, src_stride, dst, dst_stride, subpel_x, subpel_y,
76                  sf, w, h, ref, kernel, sf->x_step_q4, sf->y_step_q4);
77}
78
79static INLINE int round_mv_comp_q4(int value) {
80  return (value < 0 ? value - 2 : value + 2) / 4;
81}
82
83static MV mi_mv_pred_q4(const MODE_INFO *mi, int idx) {
84  MV res = { round_mv_comp_q4(mi->bmi[0].as_mv[idx].as_mv.row +
85                              mi->bmi[1].as_mv[idx].as_mv.row +
86                              mi->bmi[2].as_mv[idx].as_mv.row +
87                              mi->bmi[3].as_mv[idx].as_mv.row),
88             round_mv_comp_q4(mi->bmi[0].as_mv[idx].as_mv.col +
89                              mi->bmi[1].as_mv[idx].as_mv.col +
90                              mi->bmi[2].as_mv[idx].as_mv.col +
91                              mi->bmi[3].as_mv[idx].as_mv.col) };
92  return res;
93}
94
95static INLINE int round_mv_comp_q2(int value) {
96  return (value < 0 ? value - 1 : value + 1) / 2;
97}
98
99static MV mi_mv_pred_q2(const MODE_INFO *mi, int idx, int block0, int block1) {
100  MV res = { round_mv_comp_q2(mi->bmi[block0].as_mv[idx].as_mv.row +
101                              mi->bmi[block1].as_mv[idx].as_mv.row),
102             round_mv_comp_q2(mi->bmi[block0].as_mv[idx].as_mv.col +
103                              mi->bmi[block1].as_mv[idx].as_mv.col) };
104  return res;
105}
106
107// TODO(jkoleszar): yet another mv clamping function :-(
108MV clamp_mv_to_umv_border_sb(const MACROBLOCKD *xd, const MV *src_mv,
109                             int bw, int bh, int ss_x, int ss_y) {
110  // If the MV points so far into the UMV border that no visible pixels
111  // are used for reconstruction, the subpel part of the MV can be
112  // discarded and the MV limited to 16 pixels with equivalent results.
113  const int spel_left = (VP9_INTERP_EXTEND + bw) << SUBPEL_BITS;
114  const int spel_right = spel_left - SUBPEL_SHIFTS;
115  const int spel_top = (VP9_INTERP_EXTEND + bh) << SUBPEL_BITS;
116  const int spel_bottom = spel_top - SUBPEL_SHIFTS;
117  MV clamped_mv = {
118    src_mv->row * (1 << (1 - ss_y)),
119    src_mv->col * (1 << (1 - ss_x))
120  };
121  assert(ss_x <= 1);
122  assert(ss_y <= 1);
123
124  clamp_mv(&clamped_mv,
125           xd->mb_to_left_edge * (1 << (1 - ss_x)) - spel_left,
126           xd->mb_to_right_edge * (1 << (1 - ss_x)) + spel_right,
127           xd->mb_to_top_edge * (1 << (1 - ss_y)) - spel_top,
128           xd->mb_to_bottom_edge * (1 << (1 - ss_y)) + spel_bottom);
129
130  return clamped_mv;
131}
132
133MV average_split_mvs(const struct macroblockd_plane *pd,
134                     const MODE_INFO *mi, int ref, int block) {
135  const int ss_idx = ((pd->subsampling_x > 0) << 1) | (pd->subsampling_y > 0);
136  MV res = {0, 0};
137  switch (ss_idx) {
138    case 0:
139      res = mi->bmi[block].as_mv[ref].as_mv;
140      break;
141    case 1:
142      res = mi_mv_pred_q2(mi, ref, block, block + 2);
143      break;
144    case 2:
145      res = mi_mv_pred_q2(mi, ref, block, block + 1);
146      break;
147    case 3:
148      res = mi_mv_pred_q4(mi, ref);
149      break;
150    default:
151      assert(ss_idx <= 3 && ss_idx >= 0);
152  }
153  return res;
154}
155
156static void build_inter_predictors(MACROBLOCKD *xd, int plane, int block,
157                                   int bw, int bh,
158                                   int x, int y, int w, int h,
159                                   int mi_x, int mi_y) {
160  struct macroblockd_plane *const pd = &xd->plane[plane];
161  const MODE_INFO *mi = xd->mi[0];
162  const int is_compound = has_second_ref(&mi->mbmi);
163  const InterpKernel *kernel = vp9_filter_kernels[mi->mbmi.interp_filter];
164  int ref;
165
166  for (ref = 0; ref < 1 + is_compound; ++ref) {
167    const struct scale_factors *const sf = &xd->block_refs[ref]->sf;
168    struct buf_2d *const pre_buf = &pd->pre[ref];
169    struct buf_2d *const dst_buf = &pd->dst;
170    uint8_t *const dst = dst_buf->buf + dst_buf->stride * y + x;
171    const MV mv = mi->mbmi.sb_type < BLOCK_8X8
172               ? average_split_mvs(pd, mi, ref, block)
173               : mi->mbmi.mv[ref].as_mv;
174
175    // TODO(jkoleszar): This clamping is done in the incorrect place for the
176    // scaling case. It needs to be done on the scaled MV, not the pre-scaling
177    // MV. Note however that it performs the subsampling aware scaling so
178    // that the result is always q4.
179    // mv_precision precision is MV_PRECISION_Q4.
180    const MV mv_q4 = clamp_mv_to_umv_border_sb(xd, &mv, bw, bh,
181                                               pd->subsampling_x,
182                                               pd->subsampling_y);
183
184    uint8_t *pre;
185    MV32 scaled_mv;
186    int xs, ys, subpel_x, subpel_y;
187    const int is_scaled = vp9_is_scaled(sf);
188
189    if (is_scaled) {
190      pre = pre_buf->buf + scaled_buffer_offset(x, y, pre_buf->stride, sf);
191      scaled_mv = vp9_scale_mv(&mv_q4, mi_x + x, mi_y + y, sf);
192      xs = sf->x_step_q4;
193      ys = sf->y_step_q4;
194    } else {
195      pre = pre_buf->buf + (y * pre_buf->stride + x);
196      scaled_mv.row = mv_q4.row;
197      scaled_mv.col = mv_q4.col;
198      xs = ys = 16;
199    }
200    subpel_x = scaled_mv.col & SUBPEL_MASK;
201    subpel_y = scaled_mv.row & SUBPEL_MASK;
202    pre += (scaled_mv.row >> SUBPEL_BITS) * pre_buf->stride
203           + (scaled_mv.col >> SUBPEL_BITS);
204
205#if CONFIG_VP9_HIGHBITDEPTH
206    if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
207      high_inter_predictor(pre, pre_buf->stride, dst, dst_buf->stride,
208                           subpel_x, subpel_y, sf, w, h, ref, kernel, xs, ys,
209                           xd->bd);
210    } else {
211      inter_predictor(pre, pre_buf->stride, dst, dst_buf->stride,
212                      subpel_x, subpel_y, sf, w, h, ref, kernel, xs, ys);
213    }
214#else
215    inter_predictor(pre, pre_buf->stride, dst, dst_buf->stride,
216                    subpel_x, subpel_y, sf, w, h, ref, kernel, xs, ys);
217#endif  // CONFIG_VP9_HIGHBITDEPTH
218  }
219}
220
221static void build_inter_predictors_for_planes(MACROBLOCKD *xd, BLOCK_SIZE bsize,
222                                              int mi_row, int mi_col,
223                                              int plane_from, int plane_to) {
224  int plane;
225  const int mi_x = mi_col * MI_SIZE;
226  const int mi_y = mi_row * MI_SIZE;
227  for (plane = plane_from; plane <= plane_to; ++plane) {
228    const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize,
229                                                        &xd->plane[plane]);
230    const int num_4x4_w = num_4x4_blocks_wide_lookup[plane_bsize];
231    const int num_4x4_h = num_4x4_blocks_high_lookup[plane_bsize];
232    const int bw = 4 * num_4x4_w;
233    const int bh = 4 * num_4x4_h;
234
235    if (xd->mi[0]->mbmi.sb_type < BLOCK_8X8) {
236      int i = 0, x, y;
237      assert(bsize == BLOCK_8X8);
238      for (y = 0; y < num_4x4_h; ++y)
239        for (x = 0; x < num_4x4_w; ++x)
240           build_inter_predictors(xd, plane, i++, bw, bh,
241                                  4 * x, 4 * y, 4, 4, mi_x, mi_y);
242    } else {
243      build_inter_predictors(xd, plane, 0, bw, bh,
244                             0, 0, bw, bh, mi_x, mi_y);
245    }
246  }
247}
248
249void vp9_build_inter_predictors_sby(MACROBLOCKD *xd, int mi_row, int mi_col,
250                                    BLOCK_SIZE bsize) {
251  build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 0, 0);
252}
253
254void vp9_build_inter_predictors_sbp(MACROBLOCKD *xd, int mi_row, int mi_col,
255                                    BLOCK_SIZE bsize, int plane) {
256  build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, plane, plane);
257}
258
259void vp9_build_inter_predictors_sbuv(MACROBLOCKD *xd, int mi_row, int mi_col,
260                                     BLOCK_SIZE bsize) {
261  build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 1,
262                                    MAX_MB_PLANE - 1);
263}
264
265void vp9_build_inter_predictors_sb(MACROBLOCKD *xd, int mi_row, int mi_col,
266                                   BLOCK_SIZE bsize) {
267  build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 0,
268                                    MAX_MB_PLANE - 1);
269}
270
271void vp9_setup_dst_planes(struct macroblockd_plane planes[MAX_MB_PLANE],
272                          const YV12_BUFFER_CONFIG *src,
273                          int mi_row, int mi_col) {
274  uint8_t *const buffers[MAX_MB_PLANE] = { src->y_buffer, src->u_buffer,
275      src->v_buffer};
276  const int strides[MAX_MB_PLANE] = { src->y_stride, src->uv_stride,
277      src->uv_stride};
278  int i;
279
280  for (i = 0; i < MAX_MB_PLANE; ++i) {
281    struct macroblockd_plane *const pd = &planes[i];
282    setup_pred_plane(&pd->dst, buffers[i], strides[i], mi_row, mi_col, NULL,
283                     pd->subsampling_x, pd->subsampling_y);
284  }
285}
286
287void vp9_setup_pre_planes(MACROBLOCKD *xd, int idx,
288                          const YV12_BUFFER_CONFIG *src,
289                          int mi_row, int mi_col,
290                          const struct scale_factors *sf) {
291  if (src != NULL) {
292    int i;
293    uint8_t *const buffers[MAX_MB_PLANE] = { src->y_buffer, src->u_buffer,
294        src->v_buffer};
295    const int strides[MAX_MB_PLANE] = { src->y_stride, src->uv_stride,
296        src->uv_stride};
297    for (i = 0; i < MAX_MB_PLANE; ++i) {
298      struct macroblockd_plane *const pd = &xd->plane[i];
299      setup_pred_plane(&pd->pre[idx], buffers[i], strides[i], mi_row, mi_col,
300                       sf, pd->subsampling_x, pd->subsampling_y);
301    }
302  }
303}
304