ref: db1222bf3cc3fab9e404c0abaf6e3b2dc79344b1
dir: /vp9/common/vp9_reconinter.c/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <assert.h>
#include "./vpx_scale_rtcd.h"
#include "./vpx_config.h"
#include "vpx/vpx_integer.h"
#include "vp9/common/vp9_blockd.h"
#include "vp9/common/vp9_reconinter.h"
#include "vp9/common/vp9_reconintra.h"
#if CONFIG_VP9_HIGHBITDEPTH
void vp9_highbd_build_inter_predictor(
const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride,
const MV *src_mv, const struct scale_factors *sf, int w, int h, int ref,
const InterpKernel *kernel, enum mv_precision precision, int x, int y,
int bd) {
const int is_q4 = precision == MV_PRECISION_Q4;
const MV mv_q4 = { is_q4 ? src_mv->row : src_mv->row * 2,
is_q4 ? src_mv->col : src_mv->col * 2 };
MV32 mv = vp9_scale_mv(&mv_q4, x, y, sf);
const int subpel_x = mv.col & SUBPEL_MASK;
const int subpel_y = mv.row & SUBPEL_MASK;
src += (mv.row >> SUBPEL_BITS) * src_stride + (mv.col >> SUBPEL_BITS);
highbd_inter_predictor(src, src_stride, dst, dst_stride, subpel_x, subpel_y,
sf, w, h, ref, kernel, sf->x_step_q4, sf->y_step_q4,
bd);
}
#endif // CONFIG_VP9_HIGHBITDEPTH
void vp9_build_inter_predictor(const uint8_t *src, int src_stride, uint8_t *dst,
int dst_stride, const MV *src_mv,
const struct scale_factors *sf, int w, int h,
int ref, const InterpKernel *kernel,
enum mv_precision precision, int x, int y) {
const int is_q4 = precision == MV_PRECISION_Q4;
const MV mv_q4 = { is_q4 ? src_mv->row : src_mv->row * 2,
is_q4 ? src_mv->col : src_mv->col * 2 };
MV32 mv = vp9_scale_mv(&mv_q4, x, y, sf);
const int subpel_x = mv.col & SUBPEL_MASK;
const int subpel_y = mv.row & SUBPEL_MASK;
src += (mv.row >> SUBPEL_BITS) * src_stride + (mv.col >> SUBPEL_BITS);
inter_predictor(src, src_stride, dst, dst_stride, subpel_x, subpel_y, sf, w,
h, ref, kernel, sf->x_step_q4, sf->y_step_q4);
}
static INLINE int round_mv_comp_q4(int value) {
return (value < 0 ? value - 2 : value + 2) / 4;
}
static MV mi_mv_pred_q4(const MODE_INFO *mi, int idx) {
MV res = {
round_mv_comp_q4(
mi->bmi[0].as_mv[idx].as_mv.row + mi->bmi[1].as_mv[idx].as_mv.row +
mi->bmi[2].as_mv[idx].as_mv.row + mi->bmi[3].as_mv[idx].as_mv.row),
round_mv_comp_q4(
mi->bmi[0].as_mv[idx].as_mv.col + mi->bmi[1].as_mv[idx].as_mv.col +
mi->bmi[2].as_mv[idx].as_mv.col + mi->bmi[3].as_mv[idx].as_mv.col)
};
return res;
}
static INLINE int round_mv_comp_q2(int value) {
return (value < 0 ? value - 1 : value + 1) / 2;
}
static MV mi_mv_pred_q2(const MODE_INFO *mi, int idx, int block0, int block1) {
MV res = { round_mv_comp_q2(mi->bmi[block0].as_mv[idx].as_mv.row +
mi->bmi[block1].as_mv[idx].as_mv.row),
round_mv_comp_q2(mi->bmi[block0].as_mv[idx].as_mv.col +
mi->bmi[block1].as_mv[idx].as_mv.col) };
return res;
}
// TODO(jkoleszar): yet another mv clamping function :-(
MV clamp_mv_to_umv_border_sb(const MACROBLOCKD *xd, const MV *src_mv, int bw,
int bh, int ss_x, int ss_y) {
// If the MV points so far into the UMV border that no visible pixels
// are used for reconstruction, the subpel part of the MV can be
// discarded and the MV limited to 16 pixels with equivalent results.
const int spel_left = (VP9_INTERP_EXTEND + bw) << SUBPEL_BITS;
const int spel_right = spel_left - SUBPEL_SHIFTS;
const int spel_top = (VP9_INTERP_EXTEND + bh) << SUBPEL_BITS;
const int spel_bottom = spel_top - SUBPEL_SHIFTS;
MV clamped_mv = { src_mv->row * (1 << (1 - ss_y)),
src_mv->col * (1 << (1 - ss_x)) };
assert(ss_x <= 1);
assert(ss_y <= 1);
clamp_mv(&clamped_mv, xd->mb_to_left_edge * (1 << (1 - ss_x)) - spel_left,
xd->mb_to_right_edge * (1 << (1 - ss_x)) + spel_right,
xd->mb_to_top_edge * (1 << (1 - ss_y)) - spel_top,
xd->mb_to_bottom_edge * (1 << (1 - ss_y)) + spel_bottom);
return clamped_mv;
}
MV average_split_mvs(const struct macroblockd_plane *pd, const MODE_INFO *mi,
int ref, int block) {
const int ss_idx = ((pd->subsampling_x > 0) << 1) | (pd->subsampling_y > 0);
MV res = { 0, 0 };
switch (ss_idx) {
case 0: res = mi->bmi[block].as_mv[ref].as_mv; break;
case 1: res = mi_mv_pred_q2(mi, ref, block, block + 2); break;
case 2: res = mi_mv_pred_q2(mi, ref, block, block + 1); break;
case 3: res = mi_mv_pred_q4(mi, ref); break;
default: assert(ss_idx <= 3 && ss_idx >= 0);
}
return res;
}
static void build_inter_predictors(MACROBLOCKD *xd, int plane, int block,
int bw, int bh, int x, int y, int w, int h,
int mi_x, int mi_y) {
struct macroblockd_plane *const pd = &xd->plane[plane];
const MODE_INFO *mi = xd->mi[0];
const int is_compound = has_second_ref(mi);
const InterpKernel *kernel = vp9_filter_kernels[mi->interp_filter];
int ref;
for (ref = 0; ref < 1 + is_compound; ++ref) {
const struct scale_factors *const sf = &xd->block_refs[ref]->sf;
struct buf_2d *const pre_buf = &pd->pre[ref];
struct buf_2d *const dst_buf = &pd->dst;
uint8_t *const dst = dst_buf->buf + dst_buf->stride * y + x;
const MV mv = mi->sb_type < BLOCK_8X8
? average_split_mvs(pd, mi, ref, block)
: mi->mv[ref].as_mv;
// TODO(jkoleszar): This clamping is done in the incorrect place for the
// scaling case. It needs to be done on the scaled MV, not the pre-scaling
// MV. Note however that it performs the subsampling aware scaling so
// that the result is always q4.
// mv_precision precision is MV_PRECISION_Q4.
const MV mv_q4 = clamp_mv_to_umv_border_sb(
xd, &mv, bw, bh, pd->subsampling_x, pd->subsampling_y);
uint8_t *pre;
MV32 scaled_mv;
int xs, ys, subpel_x, subpel_y;
const int is_scaled = vp9_is_scaled(sf);
if (is_scaled) {
// Co-ordinate of containing block to pixel precision.
const int x_start = (-xd->mb_to_left_edge >> (3 + pd->subsampling_x));
const int y_start = (-xd->mb_to_top_edge >> (3 + pd->subsampling_y));
#if 0 // CONFIG_BETTER_HW_COMPATIBILITY
assert(xd->mi[0]->sb_type != BLOCK_4X8 &&
xd->mi[0]->sb_type != BLOCK_8X4);
assert(mv_q4.row == mv.row * (1 << (1 - pd->subsampling_y)) &&
mv_q4.col == mv.col * (1 << (1 - pd->subsampling_x)));
#endif
if (plane == 0)
pre_buf->buf = xd->block_refs[ref]->buf->y_buffer;
else if (plane == 1)
pre_buf->buf = xd->block_refs[ref]->buf->u_buffer;
else
pre_buf->buf = xd->block_refs[ref]->buf->v_buffer;
pre_buf->buf +=
scaled_buffer_offset(x_start + x, y_start + y, pre_buf->stride, sf);
pre = pre_buf->buf;
scaled_mv = vp9_scale_mv(&mv_q4, mi_x + x, mi_y + y, sf);
xs = sf->x_step_q4;
ys = sf->y_step_q4;
} else {
pre = pre_buf->buf + (y * pre_buf->stride + x);
scaled_mv.row = mv_q4.row;
scaled_mv.col = mv_q4.col;
xs = ys = 16;
}
subpel_x = scaled_mv.col & SUBPEL_MASK;
subpel_y = scaled_mv.row & SUBPEL_MASK;
pre += (scaled_mv.row >> SUBPEL_BITS) * pre_buf->stride +
(scaled_mv.col >> SUBPEL_BITS);
#if CONFIG_VP9_HIGHBITDEPTH
if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
highbd_inter_predictor(CONVERT_TO_SHORTPTR(pre), pre_buf->stride,
CONVERT_TO_SHORTPTR(dst), dst_buf->stride,
subpel_x, subpel_y, sf, w, h, ref, kernel, xs, ys,
xd->bd);
} else {
inter_predictor(pre, pre_buf->stride, dst, dst_buf->stride, subpel_x,
subpel_y, sf, w, h, ref, kernel, xs, ys);
}
#else
inter_predictor(pre, pre_buf->stride, dst, dst_buf->stride, subpel_x,
subpel_y, sf, w, h, ref, kernel, xs, ys);
#endif // CONFIG_VP9_HIGHBITDEPTH
}
}
static void build_inter_predictors_for_planes(MACROBLOCKD *xd, BLOCK_SIZE bsize,
int mi_row, int mi_col,
int plane_from, int plane_to) {
int plane;
const int mi_x = mi_col * MI_SIZE;
const int mi_y = mi_row * MI_SIZE;
for (plane = plane_from; plane <= plane_to; ++plane) {
const BLOCK_SIZE plane_bsize =
get_plane_block_size(bsize, &xd->plane[plane]);
const int num_4x4_w = num_4x4_blocks_wide_lookup[plane_bsize];
const int num_4x4_h = num_4x4_blocks_high_lookup[plane_bsize];
const int bw = 4 * num_4x4_w;
const int bh = 4 * num_4x4_h;
if (xd->mi[0]->sb_type < BLOCK_8X8) {
int i = 0, x, y;
assert(bsize == BLOCK_8X8);
for (y = 0; y < num_4x4_h; ++y)
for (x = 0; x < num_4x4_w; ++x)
build_inter_predictors(xd, plane, i++, bw, bh, 4 * x, 4 * y, 4, 4,
mi_x, mi_y);
} else {
build_inter_predictors(xd, plane, 0, bw, bh, 0, 0, bw, bh, mi_x, mi_y);
}
}
}
void vp9_build_inter_predictors_sby(MACROBLOCKD *xd, int mi_row, int mi_col,
BLOCK_SIZE bsize) {
build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 0, 0);
}
void vp9_build_inter_predictors_sbp(MACROBLOCKD *xd, int mi_row, int mi_col,
BLOCK_SIZE bsize, int plane) {
build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, plane, plane);
}
void vp9_build_inter_predictors_sbuv(MACROBLOCKD *xd, int mi_row, int mi_col,
BLOCK_SIZE bsize) {
build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 1,
MAX_MB_PLANE - 1);
}
void vp9_build_inter_predictors_sb(MACROBLOCKD *xd, int mi_row, int mi_col,
BLOCK_SIZE bsize) {
build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 0,
MAX_MB_PLANE - 1);
}
void vp9_setup_dst_planes(struct macroblockd_plane planes[MAX_MB_PLANE],
const YV12_BUFFER_CONFIG *src, int mi_row,
int mi_col) {
uint8_t *const buffers[MAX_MB_PLANE] = { src->y_buffer, src->u_buffer,
src->v_buffer };
const int strides[MAX_MB_PLANE] = { src->y_stride, src->uv_stride,
src->uv_stride };
int i;
for (i = 0; i < MAX_MB_PLANE; ++i) {
struct macroblockd_plane *const pd = &planes[i];
setup_pred_plane(&pd->dst, buffers[i], strides[i], mi_row, mi_col, NULL,
pd->subsampling_x, pd->subsampling_y);
}
}
void vp9_setup_pre_planes(MACROBLOCKD *xd, int idx,
const YV12_BUFFER_CONFIG *src, int mi_row, int mi_col,
const struct scale_factors *sf) {
if (src != NULL) {
int i;
uint8_t *const buffers[MAX_MB_PLANE] = { src->y_buffer, src->u_buffer,
src->v_buffer };
const int strides[MAX_MB_PLANE] = { src->y_stride, src->uv_stride,
src->uv_stride };
for (i = 0; i < MAX_MB_PLANE; ++i) {
struct macroblockd_plane *const pd = &xd->plane[i];
setup_pred_plane(&pd->pre[idx], buffers[i], strides[i], mi_row, mi_col,
sf, pd->subsampling_x, pd->subsampling_y);
}
}
}