ref: 2c091f9768c682366270ff9772c162580e040a9c
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_config.h"
#include "vpx/vpx_integer.h"
#include "vp9/common/vp9_blockd.h"
#include "vp9/common/vp9_filter.h"
#include "vp9/common/vp9_reconinter.h"
#include "vp9/common/vp9_reconintra.h"
#include "./vpx_scale_rtcd.h"
static int scale_value_x_with_scaling(int val,
const struct scale_factors *scale) {
return (val * scale->x_scale_fp >> VP9_REF_SCALE_SHIFT);
}
static int scale_value_y_with_scaling(int val,
const struct scale_factors *scale) {
return (val * scale->y_scale_fp >> VP9_REF_SCALE_SHIFT);
}
static int unscaled_value(int val, const struct scale_factors *scale) {
(void) scale;
return val;
}
static MV32 mv_q3_to_q4_with_scaling(const MV *mv,
const struct scale_factors *scale) {
const MV32 res = {
((mv->row << 1) * scale->y_scale_fp >> VP9_REF_SCALE_SHIFT)
+ scale->y_offset_q4,
((mv->col << 1) * scale->x_scale_fp >> VP9_REF_SCALE_SHIFT)
+ scale->x_offset_q4
};
return res;
}
static MV32 mv_q3_to_q4_without_scaling(const MV *mv,
const struct scale_factors *scale) {
const MV32 res = {
mv->row << 1,
mv->col << 1
};
return res;
}
static MV32 mv_q4_with_scaling(const MV *mv,
const struct scale_factors *scale) {
const MV32 res = {
(mv->row * scale->y_scale_fp >> VP9_REF_SCALE_SHIFT) + scale->y_offset_q4,
(mv->col * scale->x_scale_fp >> VP9_REF_SCALE_SHIFT) + scale->x_offset_q4
};
return res;
}
static MV32 mv_q4_without_scaling(const MV *mv,
const struct scale_factors *scale) {
const MV32 res = {
mv->row,
mv->col
};
return res;
}
static void set_offsets_with_scaling(struct scale_factors *scale,
int row, int col) {
const int x_q4 = 16 * col;
const int y_q4 = 16 * row;
scale->x_offset_q4 = (x_q4 * scale->x_scale_fp >> VP9_REF_SCALE_SHIFT) & 0xf;
scale->y_offset_q4 = (y_q4 * scale->y_scale_fp >> VP9_REF_SCALE_SHIFT) & 0xf;
}
static void set_offsets_without_scaling(struct scale_factors *scale,
int row, int col) {
scale->x_offset_q4 = 0;
scale->y_offset_q4 = 0;
}
static int get_fixed_point_scale_factor(int other_size, int this_size) {
// Calculate scaling factor once for each reference frame
// and use fixed point scaling factors in decoding and encoding routines.
// Hardware implementations can calculate scale factor in device driver
// and use multiplication and shifting on hardware instead of division.
return (other_size << VP9_REF_SCALE_SHIFT) / this_size;
}
void vp9_setup_scale_factors_for_frame(struct scale_factors *scale,
int other_w, int other_h,
int this_w, int this_h) {
scale->x_scale_fp = get_fixed_point_scale_factor(other_w, this_w);
scale->x_offset_q4 = 0; // calculated per-mb
scale->x_step_q4 = (16 * scale->x_scale_fp >> VP9_REF_SCALE_SHIFT);
scale->y_scale_fp = get_fixed_point_scale_factor(other_h, this_h);
scale->y_offset_q4 = 0; // calculated per-mb
scale->y_step_q4 = (16 * scale->y_scale_fp >> VP9_REF_SCALE_SHIFT);
if ((other_w == this_w) && (other_h == this_h)) {
scale->scale_value_x = unscaled_value;
scale->scale_value_y = unscaled_value;
scale->set_scaled_offsets = set_offsets_without_scaling;
scale->scale_mv_q3_to_q4 = mv_q3_to_q4_without_scaling;
scale->scale_mv_q4 = mv_q4_without_scaling;
} else {
scale->scale_value_x = scale_value_x_with_scaling;
scale->scale_value_y = scale_value_y_with_scaling;
scale->set_scaled_offsets = set_offsets_with_scaling;
scale->scale_mv_q3_to_q4 = mv_q3_to_q4_with_scaling;
scale->scale_mv_q4 = mv_q4_with_scaling;
}
// TODO(agrange): Investigate the best choice of functions to use here
// for EIGHTTAP_SMOOTH. Since it is not interpolating, need to choose what
// to do at full-pel offsets. The current selection, where the filter is
// applied in one direction only, and not at all for 0,0, seems to give the
// best quality, but it may be worth trying an additional mode that does
// do the filtering on full-pel.
if (scale->x_step_q4 == 16) {
if (scale->y_step_q4 == 16) {
// No scaling in either direction.
scale->predict[0][0][0] = vp9_convolve_copy;
scale->predict[0][0][1] = vp9_convolve_avg;
scale->predict[0][1][0] = vp9_convolve8_vert;
scale->predict[0][1][1] = vp9_convolve8_avg_vert;
scale->predict[1][0][0] = vp9_convolve8_horiz;
scale->predict[1][0][1] = vp9_convolve8_avg_horiz;
} else {
// No scaling in x direction. Must always scale in the y direction.
scale->predict[0][0][0] = vp9_convolve8_vert;
scale->predict[0][0][1] = vp9_convolve8_avg_vert;
scale->predict[0][1][0] = vp9_convolve8_vert;
scale->predict[0][1][1] = vp9_convolve8_avg_vert;
scale->predict[1][0][0] = vp9_convolve8;
scale->predict[1][0][1] = vp9_convolve8_avg;
}
} else {
if (scale->y_step_q4 == 16) {
// No scaling in the y direction. Must always scale in the x direction.
scale->predict[0][0][0] = vp9_convolve8_horiz;
scale->predict[0][0][1] = vp9_convolve8_avg_horiz;
scale->predict[0][1][0] = vp9_convolve8;
scale->predict[0][1][1] = vp9_convolve8_avg;
scale->predict[1][0][0] = vp9_convolve8_horiz;
scale->predict[1][0][1] = vp9_convolve8_avg_horiz;
} else {
// Must always scale in both directions.
scale->predict[0][0][0] = vp9_convolve8;
scale->predict[0][0][1] = vp9_convolve8_avg;
scale->predict[0][1][0] = vp9_convolve8;
scale->predict[0][1][1] = vp9_convolve8_avg;
scale->predict[1][0][0] = vp9_convolve8;
scale->predict[1][0][1] = vp9_convolve8_avg;
}
}
// 2D subpel motion always gets filtered in both directions
scale->predict[1][1][0] = vp9_convolve8;
scale->predict[1][1][1] = vp9_convolve8_avg;
}
void vp9_setup_interp_filters(MACROBLOCKD *xd,
INTERPOLATIONFILTERTYPE mcomp_filter_type,
VP9_COMMON *cm) {
if (xd->mode_info_context) {
MB_MODE_INFO *mbmi = &xd->mode_info_context->mbmi;
set_scale_factors(xd, mbmi->ref_frame[0] - 1, mbmi->ref_frame[1] - 1,
cm->active_ref_scale);
}
switch (mcomp_filter_type) {
case EIGHTTAP:
case SWITCHABLE:
xd->subpix.filter_x = xd->subpix.filter_y = vp9_sub_pel_filters_8;
break;
case EIGHTTAP_SMOOTH:
xd->subpix.filter_x = xd->subpix.filter_y = vp9_sub_pel_filters_8lp;
break;
case EIGHTTAP_SHARP:
xd->subpix.filter_x = xd->subpix.filter_y = vp9_sub_pel_filters_8s;
break;
case BILINEAR:
xd->subpix.filter_x = xd->subpix.filter_y = vp9_bilinear_filters;
break;
}
assert(((intptr_t)xd->subpix.filter_x & 0xff) == 0);
}
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 *scale,
int w, int h, int weight,
const struct subpix_fn_table *subpix,
enum mv_precision precision) {
const MV32 mv = precision == MV_PRECISION_Q4
? scale->scale_mv_q4(src_mv, scale)
: scale->scale_mv_q3_to_q4(src_mv, scale);
const int subpel_x = mv.col & 15;
const int subpel_y = mv.row & 15;
src += (mv.row >> 4) * src_stride + (mv.col >> 4);
scale->predict[!!subpel_x][!!subpel_y][weight](
src, src_stride, dst, dst_stride,
subpix->filter_x[subpel_x], scale->x_step_q4,
subpix->filter_y[subpel_y], scale->y_step_q4,
w, h);
}
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;
}
// TODO(jkoleszar): yet another mv clamping function :-(
MV clamp_mv_to_umv_border_sb(const MV *src_mv,
int bwl, int bhl, int ss_x, int ss_y,
int mb_to_left_edge, int mb_to_top_edge,
int mb_to_right_edge, int mb_to_bottom_edge) {
// 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 + (4 << bwl)) << 4;
const int spel_right = spel_left - (1 << 4);
const int spel_top = (VP9_INTERP_EXTEND + (4 << bhl)) << 4;
const int spel_bottom = spel_top - (1 << 4);
MV clamped_mv = {
src_mv->row << (1 - ss_y),
src_mv->col << (1 - ss_x)
};
assert(ss_x <= 1);
assert(ss_y <= 1);
clamp_mv(&clamped_mv, (mb_to_left_edge << (1 - ss_x)) - spel_left,
(mb_to_right_edge << (1 - ss_x)) + spel_right,
(mb_to_top_edge << (1 - ss_y)) - spel_top,
(mb_to_bottom_edge << (1 - ss_y)) + spel_bottom);
return clamped_mv;
}
struct build_inter_predictors_args {
MACROBLOCKD *xd;
int x;
int y;
uint8_t* dst[MAX_MB_PLANE];
int dst_stride[MAX_MB_PLANE];
uint8_t* pre[2][MAX_MB_PLANE];
int pre_stride[2][MAX_MB_PLANE];
};
static void build_inter_predictors(int plane, int block,
BLOCK_SIZE_TYPE bsize,
int pred_w, int pred_h,
void *argv) {
const struct build_inter_predictors_args* const arg = argv;
MACROBLOCKD * const xd = arg->xd;
const int bwl = b_width_log2(bsize) - xd->plane[plane].subsampling_x;
const int bhl = b_height_log2(bsize) - xd->plane[plane].subsampling_y;
const int x = 4 * (block & ((1 << bwl) - 1)), y = 4 * (block >> bwl);
const MODE_INFO *const mi = xd->mode_info_context;
const int use_second_ref = mi->mbmi.ref_frame[1] > 0;
int which_mv;
assert(x < (4 << bwl));
assert(y < (4 << bhl));
assert(mi->mbmi.sb_type < BLOCK_8X8 || 4 << pred_w == (4 << bwl));
assert(mi->mbmi.sb_type < BLOCK_8X8 || 4 << pred_h == (4 << bhl));
for (which_mv = 0; which_mv < 1 + use_second_ref; ++which_mv) {
// source
const uint8_t * const base_pre = arg->pre[which_mv][plane];
const int pre_stride = arg->pre_stride[which_mv][plane];
const uint8_t *const pre = base_pre +
scaled_buffer_offset(x, y, pre_stride, &xd->scale_factor[which_mv]);
struct scale_factors * const scale = &xd->scale_factor[which_mv];
// dest
uint8_t *const dst = arg->dst[plane] + arg->dst_stride[plane] * y + x;
// TODO(jkoleszar): All chroma MVs in SPLITMV mode are taken as the
// same MV (the average of the 4 luma MVs) but we could do something
// smarter for non-4:2:0. Just punt for now, pending the changes to get
// rid of SPLITMV mode entirely.
const MV mv = mi->mbmi.sb_type < BLOCK_8X8
? (plane == 0 ? mi->bmi[block].as_mv[which_mv].as_mv
: mi_mv_pred_q4(mi, which_mv))
: mi->mbmi.mv[which_mv].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.
const MV res_mv = clamp_mv_to_umv_border_sb(&mv, bwl, bhl,
xd->plane[plane].subsampling_x,
xd->plane[plane].subsampling_y,
xd->mb_to_left_edge,
xd->mb_to_top_edge,
xd->mb_to_right_edge,
xd->mb_to_bottom_edge);
scale->set_scaled_offsets(scale, arg->y + y, arg->x + x);
vp9_build_inter_predictor(pre, pre_stride,
dst, arg->dst_stride[plane],
&res_mv, &xd->scale_factor[which_mv],
4 << pred_w, 4 << pred_h, which_mv,
&xd->subpix, MV_PRECISION_Q4);
}
}
void vp9_build_inter_predictors_sby(MACROBLOCKD *xd,
int mi_row,
int mi_col,
BLOCK_SIZE_TYPE bsize) {
struct build_inter_predictors_args args = {
xd, mi_col * MI_SIZE, mi_row * MI_SIZE,
{xd->plane[0].dst.buf, NULL, NULL}, {xd->plane[0].dst.stride, 0, 0},
{{xd->plane[0].pre[0].buf, NULL, NULL},
{xd->plane[0].pre[1].buf, NULL, NULL}},
{{xd->plane[0].pre[0].stride, 0, 0}, {xd->plane[0].pre[1].stride, 0, 0}},
};
foreach_predicted_block_in_plane(xd, bsize, 0, build_inter_predictors, &args);
}
void vp9_build_inter_predictors_sbuv(MACROBLOCKD *xd,
int mi_row,
int mi_col,
BLOCK_SIZE_TYPE bsize) {
struct build_inter_predictors_args args = {
xd, mi_col * MI_SIZE, mi_row * MI_SIZE,
#if CONFIG_ALPHA
{NULL, xd->plane[1].dst.buf, xd->plane[2].dst.buf,
xd->plane[3].dst.buf},
{0, xd->plane[1].dst.stride, xd->plane[1].dst.stride,
xd->plane[3].dst.stride},
{{NULL, xd->plane[1].pre[0].buf, xd->plane[2].pre[0].buf,
xd->plane[3].pre[0].buf},
{NULL, xd->plane[1].pre[1].buf, xd->plane[2].pre[1].buf,
xd->plane[3].pre[1].buf}},
{{0, xd->plane[1].pre[0].stride, xd->plane[1].pre[0].stride,
xd->plane[3].pre[0].stride},
{0, xd->plane[1].pre[1].stride, xd->plane[1].pre[1].stride,
xd->plane[3].pre[1].stride}},
#else
{NULL, xd->plane[1].dst.buf, xd->plane[2].dst.buf},
{0, xd->plane[1].dst.stride, xd->plane[1].dst.stride},
{{NULL, xd->plane[1].pre[0].buf, xd->plane[2].pre[0].buf},
{NULL, xd->plane[1].pre[1].buf, xd->plane[2].pre[1].buf}},
{{0, xd->plane[1].pre[0].stride, xd->plane[1].pre[0].stride},
{0, xd->plane[1].pre[1].stride, xd->plane[1].pre[1].stride}},
#endif
};
foreach_predicted_block_uv(xd, bsize, build_inter_predictors, &args);
}
void vp9_build_inter_predictors_sb(MACROBLOCKD *xd,
int mi_row, int mi_col,
BLOCK_SIZE_TYPE bsize) {
vp9_build_inter_predictors_sby(xd, mi_row, mi_col, bsize);
vp9_build_inter_predictors_sbuv(xd, mi_row, mi_col, bsize);
}
// TODO(dkovalev: find better place for this function)
void vp9_setup_scale_factors(VP9_COMMON *cm, int i) {
const int ref = cm->active_ref_idx[i];
struct scale_factors *const sf = &cm->active_ref_scale[i];
if (ref >= NUM_YV12_BUFFERS) {
vp9_zero(*sf);
} else {
YV12_BUFFER_CONFIG *const fb = &cm->yv12_fb[ref];
vp9_setup_scale_factors_for_frame(sf,
fb->y_crop_width, fb->y_crop_height,
cm->width, cm->height);
if (sf->x_scale_fp != VP9_REF_NO_SCALE ||
sf->y_scale_fp != VP9_REF_NO_SCALE)
vp9_extend_frame_borders(fb, cm->subsampling_x, cm->subsampling_y);
}
}