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 vp9_highbd_build_inter_predictor(
24    const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride,
25    const MV *src_mv, const struct scale_factors *sf, int w, int h, int ref,
26    const InterpKernel *kernel, enum mv_precision precision, int x, int y,
27    int bd) {
28  const int is_q4 = precision == MV_PRECISION_Q4;
29  const MV mv_q4 = { is_q4 ? src_mv->row : src_mv->row * 2,
30                     is_q4 ? src_mv->col : src_mv->col * 2 };
31  MV32 mv = vp9_scale_mv(&mv_q4, x, y, sf);
32  const int subpel_x = mv.col & SUBPEL_MASK;
33  const int subpel_y = mv.row & SUBPEL_MASK;
34
35  src += (mv.row >> SUBPEL_BITS) * src_stride + (mv.col >> SUBPEL_BITS);
36
37  highbd_inter_predictor(src, src_stride, dst, dst_stride, subpel_x, subpel_y,
38                         sf, w, h, ref, kernel, sf->x_step_q4, sf->y_step_q4,
39                         bd);
40}
41#endif  // CONFIG_VP9_HIGHBITDEPTH
42
43void vp9_build_inter_predictor(const uint8_t *src, int src_stride, uint8_t *dst,
44                               int dst_stride, const MV *src_mv,
45                               const struct scale_factors *sf, int w, int h,
46                               int ref, const InterpKernel *kernel,
47                               enum mv_precision precision, int x, int y) {
48  const int is_q4 = precision == MV_PRECISION_Q4;
49  const MV mv_q4 = { is_q4 ? src_mv->row : src_mv->row * 2,
50                     is_q4 ? src_mv->col : src_mv->col * 2 };
51  MV32 mv = vp9_scale_mv(&mv_q4, x, y, sf);
52  const int subpel_x = mv.col & SUBPEL_MASK;
53  const int subpel_y = mv.row & SUBPEL_MASK;
54
55  src += (mv.row >> SUBPEL_BITS) * src_stride + (mv.col >> SUBPEL_BITS);
56
57  inter_predictor(src, src_stride, dst, dst_stride, subpel_x, subpel_y, sf, w,
58                  h, ref, kernel, sf->x_step_q4, sf->y_step_q4);
59}
60
61static INLINE int round_mv_comp_q4(int value) {
62  return (value < 0 ? value - 2 : value + 2) / 4;
63}
64
65static MV mi_mv_pred_q4(const MODE_INFO *mi, int idx) {
66  MV res = {
67    round_mv_comp_q4(
68        mi->bmi[0].as_mv[idx].as_mv.row + mi->bmi[1].as_mv[idx].as_mv.row +
69        mi->bmi[2].as_mv[idx].as_mv.row + mi->bmi[3].as_mv[idx].as_mv.row),
70    round_mv_comp_q4(
71        mi->bmi[0].as_mv[idx].as_mv.col + mi->bmi[1].as_mv[idx].as_mv.col +
72        mi->bmi[2].as_mv[idx].as_mv.col + mi->bmi[3].as_mv[idx].as_mv.col)
73  };
74  return res;
75}
76
77static INLINE int round_mv_comp_q2(int value) {
78  return (value < 0 ? value - 1 : value + 1) / 2;
79}
80
81static MV mi_mv_pred_q2(const MODE_INFO *mi, int idx, int block0, int block1) {
82  MV res = { round_mv_comp_q2(mi->bmi[block0].as_mv[idx].as_mv.row +
83                              mi->bmi[block1].as_mv[idx].as_mv.row),
84             round_mv_comp_q2(mi->bmi[block0].as_mv[idx].as_mv.col +
85                              mi->bmi[block1].as_mv[idx].as_mv.col) };
86  return res;
87}
88
89// TODO(jkoleszar): yet another mv clamping function :-(
90MV clamp_mv_to_umv_border_sb(const MACROBLOCKD *xd, const MV *src_mv, int bw,
91                             int bh, int ss_x, int ss_y) {
92  // If the MV points so far into the UMV border that no visible pixels
93  // are used for reconstruction, the subpel part of the MV can be
94  // discarded and the MV limited to 16 pixels with equivalent results.
95  const int spel_left = (VP9_INTERP_EXTEND + bw) << SUBPEL_BITS;
96  const int spel_right = spel_left - SUBPEL_SHIFTS;
97  const int spel_top = (VP9_INTERP_EXTEND + bh) << SUBPEL_BITS;
98  const int spel_bottom = spel_top - SUBPEL_SHIFTS;
99  MV clamped_mv = { src_mv->row * (1 << (1 - ss_y)),
100                    src_mv->col * (1 << (1 - ss_x)) };
101  assert(ss_x <= 1);
102  assert(ss_y <= 1);
103
104  clamp_mv(&clamped_mv, xd->mb_to_left_edge * (1 << (1 - ss_x)) - spel_left,
105           xd->mb_to_right_edge * (1 << (1 - ss_x)) + spel_right,
106           xd->mb_to_top_edge * (1 << (1 - ss_y)) - spel_top,
107           xd->mb_to_bottom_edge * (1 << (1 - ss_y)) + spel_bottom);
108
109  return clamped_mv;
110}
111
112MV average_split_mvs(const struct macroblockd_plane *pd, const MODE_INFO *mi,
113                     int ref, int block) {
114  const int ss_idx = ((pd->subsampling_x > 0) << 1) | (pd->subsampling_y > 0);
115  MV res = { 0, 0 };
116  switch (ss_idx) {
117    case 0: res = mi->bmi[block].as_mv[ref].as_mv; break;
118    case 1: res = mi_mv_pred_q2(mi, ref, block, block + 2); break;
119    case 2: res = mi_mv_pred_q2(mi, ref, block, block + 1); break;
120    case 3: res = mi_mv_pred_q4(mi, ref); break;
121    default: assert(ss_idx <= 3 && ss_idx >= 0);
122  }
123  return res;
124}
125
126static void build_inter_predictors(MACROBLOCKD *xd, int plane, int block,
127                                   int bw, int bh, int x, int y, int w, int h,
128                                   int mi_x, int mi_y) {
129  struct macroblockd_plane *const pd = &xd->plane[plane];
130  const MODE_INFO *mi = xd->mi[0];
131  const int is_compound = has_second_ref(mi);
132  const InterpKernel *kernel = vp9_filter_kernels[mi->interp_filter];
133  int ref;
134
135  for (ref = 0; ref < 1 + is_compound; ++ref) {
136    const struct scale_factors *const sf = &xd->block_refs[ref]->sf;
137    struct buf_2d *const pre_buf = &pd->pre[ref];
138    struct buf_2d *const dst_buf = &pd->dst;
139    uint8_t *const dst = dst_buf->buf + dst_buf->stride * y + x;
140    const MV mv = mi->sb_type < BLOCK_8X8
141                      ? average_split_mvs(pd, mi, ref, block)
142                      : mi->mv[ref].as_mv;
143
144    // TODO(jkoleszar): This clamping is done in the incorrect place for the
145    // scaling case. It needs to be done on the scaled MV, not the pre-scaling
146    // MV. Note however that it performs the subsampling aware scaling so
147    // that the result is always q4.
148    // mv_precision precision is MV_PRECISION_Q4.
149    const MV mv_q4 = clamp_mv_to_umv_border_sb(
150        xd, &mv, bw, bh, pd->subsampling_x, pd->subsampling_y);
151
152    uint8_t *pre;
153    MV32 scaled_mv;
154    int xs, ys, subpel_x, subpel_y;
155    const int is_scaled = vp9_is_scaled(sf);
156
157    if (is_scaled) {
158      // Co-ordinate of containing block to pixel precision.
159      const int x_start = (-xd->mb_to_left_edge >> (3 + pd->subsampling_x));
160      const int y_start = (-xd->mb_to_top_edge >> (3 + pd->subsampling_y));
161#if 0  // CONFIG_BETTER_HW_COMPATIBILITY
162      assert(xd->mi[0]->sb_type != BLOCK_4X8 &&
163             xd->mi[0]->sb_type != BLOCK_8X4);
164      assert(mv_q4.row == mv.row * (1 << (1 - pd->subsampling_y)) &&
165             mv_q4.col == mv.col * (1 << (1 - pd->subsampling_x)));
166#endif
167      if (plane == 0)
168        pre_buf->buf = xd->block_refs[ref]->buf->y_buffer;
169      else if (plane == 1)
170        pre_buf->buf = xd->block_refs[ref]->buf->u_buffer;
171      else
172        pre_buf->buf = xd->block_refs[ref]->buf->v_buffer;
173
174      pre_buf->buf +=
175          scaled_buffer_offset(x_start + x, y_start + y, pre_buf->stride, sf);
176      pre = pre_buf->buf;
177      scaled_mv = vp9_scale_mv(&mv_q4, mi_x + x, mi_y + y, sf);
178      xs = sf->x_step_q4;
179      ys = sf->y_step_q4;
180    } else {
181      pre = pre_buf->buf + (y * pre_buf->stride + x);
182      scaled_mv.row = mv_q4.row;
183      scaled_mv.col = mv_q4.col;
184      xs = ys = 16;
185    }
186    subpel_x = scaled_mv.col & SUBPEL_MASK;
187    subpel_y = scaled_mv.row & SUBPEL_MASK;
188    pre += (scaled_mv.row >> SUBPEL_BITS) * pre_buf->stride +
189           (scaled_mv.col >> SUBPEL_BITS);
190
191#if CONFIG_VP9_HIGHBITDEPTH
192    if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
193      highbd_inter_predictor(CONVERT_TO_SHORTPTR(pre), pre_buf->stride,
194                             CONVERT_TO_SHORTPTR(dst), dst_buf->stride,
195                             subpel_x, subpel_y, sf, w, h, ref, kernel, xs, ys,
196                             xd->bd);
197    } else {
198      inter_predictor(pre, pre_buf->stride, dst, dst_buf->stride, subpel_x,
199                      subpel_y, sf, w, h, ref, kernel, xs, ys);
200    }
201#else
202    inter_predictor(pre, pre_buf->stride, dst, dst_buf->stride, subpel_x,
203                    subpel_y, sf, w, h, ref, kernel, xs, ys);
204#endif  // CONFIG_VP9_HIGHBITDEPTH
205  }
206}
207
208static void build_inter_predictors_for_planes(MACROBLOCKD *xd, BLOCK_SIZE bsize,
209                                              int mi_row, int mi_col,
210                                              int plane_from, int plane_to) {
211  int plane;
212  const int mi_x = mi_col * MI_SIZE;
213  const int mi_y = mi_row * MI_SIZE;
214  for (plane = plane_from; plane <= plane_to; ++plane) {
215    const BLOCK_SIZE plane_bsize =
216        get_plane_block_size(bsize, &xd->plane[plane]);
217    const int num_4x4_w = num_4x4_blocks_wide_lookup[plane_bsize];
218    const int num_4x4_h = num_4x4_blocks_high_lookup[plane_bsize];
219    const int bw = 4 * num_4x4_w;
220    const int bh = 4 * num_4x4_h;
221
222    if (xd->mi[0]->sb_type < BLOCK_8X8) {
223      int i = 0, x, y;
224      assert(bsize == BLOCK_8X8);
225      for (y = 0; y < num_4x4_h; ++y)
226        for (x = 0; x < num_4x4_w; ++x)
227          build_inter_predictors(xd, plane, i++, bw, bh, 4 * x, 4 * y, 4, 4,
228                                 mi_x, mi_y);
229    } else {
230      build_inter_predictors(xd, plane, 0, bw, bh, 0, 0, bw, bh, mi_x, mi_y);
231    }
232  }
233}
234
235void vp9_build_inter_predictors_sby(MACROBLOCKD *xd, int mi_row, int mi_col,
236                                    BLOCK_SIZE bsize) {
237  build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 0, 0);
238}
239
240void vp9_build_inter_predictors_sbp(MACROBLOCKD *xd, int mi_row, int mi_col,
241                                    BLOCK_SIZE bsize, int plane) {
242  build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, plane, plane);
243}
244
245void vp9_build_inter_predictors_sbuv(MACROBLOCKD *xd, int mi_row, int mi_col,
246                                     BLOCK_SIZE bsize) {
247  build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 1,
248                                    MAX_MB_PLANE - 1);
249}
250
251void vp9_build_inter_predictors_sb(MACROBLOCKD *xd, int mi_row, int mi_col,
252                                   BLOCK_SIZE bsize) {
253  build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 0,
254                                    MAX_MB_PLANE - 1);
255}
256
257void vp9_setup_dst_planes(struct macroblockd_plane planes[MAX_MB_PLANE],
258                          const YV12_BUFFER_CONFIG *src, int mi_row,
259                          int mi_col) {
260  uint8_t *const buffers[MAX_MB_PLANE] = { src->y_buffer, src->u_buffer,
261                                           src->v_buffer };
262  const int strides[MAX_MB_PLANE] = { src->y_stride, src->uv_stride,
263                                      src->uv_stride };
264  int i;
265
266  for (i = 0; i < MAX_MB_PLANE; ++i) {
267    struct macroblockd_plane *const pd = &planes[i];
268    setup_pred_plane(&pd->dst, buffers[i], strides[i], mi_row, mi_col, NULL,
269                     pd->subsampling_x, pd->subsampling_y);
270  }
271}
272
273void vp9_setup_pre_planes(MACROBLOCKD *xd, int idx,
274                          const YV12_BUFFER_CONFIG *src, int mi_row, int mi_col,
275                          const struct scale_factors *sf) {
276  if (src != NULL) {
277    int i;
278    uint8_t *const buffers[MAX_MB_PLANE] = { src->y_buffer, src->u_buffer,
279                                             src->v_buffer };
280    const int strides[MAX_MB_PLANE] = { src->y_stride, src->uv_stride,
281                                        src->uv_stride };
282    for (i = 0; i < MAX_MB_PLANE; ++i) {
283      struct macroblockd_plane *const pd = &xd->plane[i];
284      setup_pred_plane(&pd->pre[idx], buffers[i], strides[i], mi_row, mi_col,
285                       sf, pd->subsampling_x, pd->subsampling_y);
286    }
287  }
288}
289