ref: 93ec31dff684b3f287792fc9b58147ae7ee3ec3f
parent: eec622d178e2bdc1098fcb86e954800ce03138fa
parent: 175c313a128fd3b543e73751dc2334af5c45a5fa
author: Yunqing Wang <[email protected]>
date: Thu Oct 24 05:13:41 EDT 2013
Merge "Improve scale_factors struct"
--- a/vp9/common/vp9_onyxc_int.h
+++ b/vp9/common/vp9_onyxc_int.h
@@ -115,6 +115,7 @@
// Each frame can reference ALLOWED_REFS_PER_FRAME buffers
int active_ref_idx[ALLOWED_REFS_PER_FRAME];
struct scale_factors active_ref_scale[ALLOWED_REFS_PER_FRAME];
+ struct scale_factors_common active_ref_scale_comm[ALLOWED_REFS_PER_FRAME];
int new_fb_idx;
YV12_BUFFER_CONFIG post_proc_buffer;
--- a/vp9/common/vp9_reconinter.c
+++ b/vp9/common/vp9_reconinter.c
@@ -40,6 +40,24 @@
assert(((intptr_t)xd->subpix.filter_x & 0xff) == 0);
}
+static void inter_predictor(const uint8_t *src, int src_stride,
+ uint8_t *dst, int dst_stride,
+ const MV32 *mv,
+ const struct scale_factors *scale,
+ int w, int h, int ref,
+ const struct subpix_fn_table *subpix,
+ int xs, int ys) {+ 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);
+ scale->sfc->predict[subpel_x != 0][subpel_y != 0][ref](
+ src, src_stride, dst, dst_stride,
+ subpix->filter_x[subpel_x], xs,
+ subpix->filter_y[subpel_y], ys,
+ w, h);
+}
+
void vp9_build_inter_predictor(const uint8_t *src, int src_stride,
uint8_t *dst, int dst_stride,
const MV *src_mv,
@@ -50,16 +68,11 @@
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 };
- const MV32 mv = scale->scale_mv(&mv_q4, scale);
- const int subpel_x = mv.col & SUBPEL_MASK;
- const int subpel_y = mv.row & SUBPEL_MASK;
+ const struct scale_factors_common *sfc = scale->sfc;
+ const MV32 mv = sfc->scale_mv(&mv_q4, scale);
- src += (mv.row >> SUBPEL_BITS) * src_stride + (mv.col >> SUBPEL_BITS);
- scale->predict[subpel_x != 0][subpel_y != 0][ref](
- 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);
+ inter_predictor(src, src_stride, dst, dst_stride, &mv, scale,
+ w, h, ref, subpix, sfc->x_step_q4, sfc->y_step_q4);
}
static INLINE int round_mv_comp_q4(int value) {@@ -133,10 +146,6 @@
struct scale_factors *const scale = &xd->scale_factor[ref];
struct buf_2d *const pre_buf = &pd->pre[ref];
struct buf_2d *const dst_buf = &pd->dst;
-
- const uint8_t *const pre = pre_buf->buf + scaled_buffer_offset(x, y,
- pre_buf->stride, scale);
-
uint8_t *const dst = dst_buf->buf + dst_buf->stride * y + x;
// TODO(jkoleszar): All chroma MVs in SPLITMV mode are taken as the
@@ -156,11 +165,29 @@
pd->subsampling_x,
pd->subsampling_y);
- scale->set_scaled_offsets(scale, arg->y + y, arg->x + x);
- vp9_build_inter_predictor(pre, pre_buf->stride, dst, dst_buf->stride,
- &res_mv, scale,
- 4 << pred_w, 4 << pred_h, ref,
- &xd->subpix, MV_PRECISION_Q4);
+ uint8_t *pre;
+ // mv_precision precision is MV_PRECISION_Q4.
+ const MV mv_q4 = {res_mv.row, res_mv.col };+ MV32 scaled_mv;
+ int xs, ys;
+
+ if (vp9_is_scaled(scale->sfc)) {+ pre = pre_buf->buf + scaled_buffer_offset(x, y, pre_buf->stride, scale);
+ scale->sfc->set_scaled_offsets(scale, arg->y + y, arg->x + x);
+ scaled_mv = scale->sfc->scale_mv(&mv_q4, scale);
+ xs = scale->sfc->x_step_q4;
+ ys = scale->sfc->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;
+ }
+
+ inter_predictor(pre, pre_buf->stride, dst, dst_buf->stride,
+ &scaled_mv, scale,
+ 4 << pred_w, 4 << pred_h, ref,
+ &xd->subpix, xs, ys);
}
}
@@ -220,15 +247,17 @@
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];
+ struct scale_factors_common *const sfc = &cm->active_ref_scale_comm[i];
if (ref >= NUM_YV12_BUFFERS) {vp9_zero(*sf);
+ vp9_zero(*sfc);
} else {YV12_BUFFER_CONFIG *const fb = &cm->yv12_fb[ref];
- vp9_setup_scale_factors_for_frame(sf,
+ vp9_setup_scale_factors_for_frame(sf, sfc,
fb->y_crop_width, fb->y_crop_height,
cm->width, cm->height);
- if (vp9_is_scaled(sf))
+ if (vp9_is_scaled(sfc))
vp9_extend_frame_borders(fb, cm->subsampling_x, cm->subsampling_y);
}
}
--- a/vp9/common/vp9_reconinter.h
+++ b/vp9/common/vp9_reconinter.h
@@ -38,8 +38,10 @@
static int scaled_buffer_offset(int x_offset, int y_offset, int stride,
const struct scale_factors *scale) {- const int x = scale ? scale->scale_value_x(x_offset, scale) : x_offset;
- const int y = scale ? scale->scale_value_y(y_offset, scale) : y_offset;
+ const int x = scale ? scale->sfc->scale_value_x(x_offset, scale->sfc) :
+ x_offset;
+ const int y = scale ? scale->sfc->scale_value_y(y_offset, scale->sfc) :
+ y_offset;
return y * stride + x;
}
--- a/vp9/common/vp9_scale.c
+++ b/vp9/common/vp9_scale.c
@@ -12,23 +12,23 @@
#include "vp9/common/vp9_filter.h"
#include "vp9/common/vp9_scale.h"
-static INLINE int scaled_x(int val, const struct scale_factors *scale) {- return val * scale->x_scale_fp >> REF_SCALE_SHIFT;
+static INLINE int scaled_x(int val, const struct scale_factors_common *sfc) {+ return val * sfc->x_scale_fp >> REF_SCALE_SHIFT;
}
-static INLINE int scaled_y(int val, const struct scale_factors *scale) {- return val * scale->y_scale_fp >> REF_SCALE_SHIFT;
+static INLINE int scaled_y(int val, const struct scale_factors_common *sfc) {+ return val * sfc->y_scale_fp >> REF_SCALE_SHIFT;
}
-static int unscaled_value(int val, const struct scale_factors *scale) {- (void) scale;
+static int unscaled_value(int val, const struct scale_factors_common *sfc) {+ (void) sfc;
return val;
}
static MV32 scaled_mv(const MV *mv, const struct scale_factors *scale) { const MV32 res = {- scaled_y(mv->row, scale) + scale->y_offset_q4,
- scaled_x(mv->col, scale) + scale->x_offset_q4
+ scaled_y(mv->row, scale->sfc) + scale->y_offset_q4,
+ scaled_x(mv->col, scale->sfc) + scale->x_offset_q4
};
return res;
}
@@ -43,8 +43,8 @@
static void set_offsets_with_scaling(struct scale_factors *scale,
int row, int col) {- scale->x_offset_q4 = scaled_x(col << SUBPEL_BITS, scale) & SUBPEL_MASK;
- scale->y_offset_q4 = scaled_y(row << SUBPEL_BITS, scale) & SUBPEL_MASK;
+ scale->x_offset_q4 = scaled_x(col << SUBPEL_BITS, scale->sfc) & SUBPEL_MASK;
+ scale->y_offset_q4 = scaled_y(row << SUBPEL_BITS, scale->sfc) & SUBPEL_MASK;
}
static void set_offsets_without_scaling(struct scale_factors *scale,
@@ -70,31 +70,30 @@
}
void vp9_setup_scale_factors_for_frame(struct scale_factors *scale,
+ struct scale_factors_common *scale_comm,
int other_w, int other_h,
int this_w, int this_h) { if (!check_scale_factors(other_w, other_h, this_w, this_h)) {- scale->x_scale_fp = REF_INVALID_SCALE;
- scale->y_scale_fp = REF_INVALID_SCALE;
+ scale_comm->x_scale_fp = REF_INVALID_SCALE;
+ scale_comm->y_scale_fp = REF_INVALID_SCALE;
return;
}
- scale->x_scale_fp = get_fixed_point_scale_factor(other_w, this_w);
- scale->y_scale_fp = get_fixed_point_scale_factor(other_h, this_h);
- scale->x_step_q4 = scaled_x(16, scale);
- scale->y_step_q4 = scaled_y(16, scale);
- scale->x_offset_q4 = 0; // calculated per block
- scale->y_offset_q4 = 0; // calculated per block
+ scale_comm->x_scale_fp = get_fixed_point_scale_factor(other_w, this_w);
+ scale_comm->y_scale_fp = get_fixed_point_scale_factor(other_h, this_h);
+ scale_comm->x_step_q4 = scaled_x(16, scale_comm);
+ scale_comm->y_step_q4 = scaled_y(16, scale_comm);
- if (vp9_is_scaled(scale)) {- scale->scale_value_x = scaled_x;
- scale->scale_value_y = scaled_y;
- scale->set_scaled_offsets = set_offsets_with_scaling;
- scale->scale_mv = scaled_mv;
+ if (vp9_is_scaled(scale_comm)) {+ scale_comm->scale_value_x = scaled_x;
+ scale_comm->scale_value_y = scaled_y;
+ scale_comm->set_scaled_offsets = set_offsets_with_scaling;
+ scale_comm->scale_mv = scaled_mv;
} else {- scale->scale_value_x = unscaled_value;
- scale->scale_value_y = unscaled_value;
- scale->set_scaled_offsets = set_offsets_without_scaling;
- scale->scale_mv = unscaled_mv;
+ scale_comm->scale_value_x = unscaled_value;
+ scale_comm->scale_value_y = unscaled_value;
+ scale_comm->set_scaled_offsets = set_offsets_without_scaling;
+ scale_comm->scale_mv = unscaled_mv;
}
// TODO(agrange): Investigate the best choice of functions to use here
@@ -103,44 +102,48 @@
// 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) {+ if (scale_comm->x_step_q4 == 16) {+ if (scale_comm->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;
+ scale_comm->predict[0][0][0] = vp9_convolve_copy;
+ scale_comm->predict[0][0][1] = vp9_convolve_avg;
+ scale_comm->predict[0][1][0] = vp9_convolve8_vert;
+ scale_comm->predict[0][1][1] = vp9_convolve8_avg_vert;
+ scale_comm->predict[1][0][0] = vp9_convolve8_horiz;
+ scale_comm->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;
+ scale_comm->predict[0][0][0] = vp9_convolve8_vert;
+ scale_comm->predict[0][0][1] = vp9_convolve8_avg_vert;
+ scale_comm->predict[0][1][0] = vp9_convolve8_vert;
+ scale_comm->predict[0][1][1] = vp9_convolve8_avg_vert;
+ scale_comm->predict[1][0][0] = vp9_convolve8;
+ scale_comm->predict[1][0][1] = vp9_convolve8_avg;
}
} else {- if (scale->y_step_q4 == 16) {+ if (scale_comm->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;
+ scale_comm->predict[0][0][0] = vp9_convolve8_horiz;
+ scale_comm->predict[0][0][1] = vp9_convolve8_avg_horiz;
+ scale_comm->predict[0][1][0] = vp9_convolve8;
+ scale_comm->predict[0][1][1] = vp9_convolve8_avg;
+ scale_comm->predict[1][0][0] = vp9_convolve8_horiz;
+ scale_comm->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;
+ scale_comm->predict[0][0][0] = vp9_convolve8;
+ scale_comm->predict[0][0][1] = vp9_convolve8_avg;
+ scale_comm->predict[0][1][0] = vp9_convolve8;
+ scale_comm->predict[0][1][1] = vp9_convolve8_avg;
+ scale_comm->predict[1][0][0] = vp9_convolve8;
+ scale_comm->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;
+ scale_comm->predict[1][1][0] = vp9_convolve8;
+ scale_comm->predict[1][1][1] = vp9_convolve8_avg;
+
+ scale->sfc = scale_comm;
+ scale->x_offset_q4 = 0; // calculated per block
+ scale->y_offset_q4 = 0; // calculated per block
}
--- a/vp9/common/vp9_scale.h
+++ b/vp9/common/vp9_scale.h
@@ -18,16 +18,15 @@
#define REF_NO_SCALE (1 << REF_SCALE_SHIFT)
#define REF_INVALID_SCALE -1
-struct scale_factors {+struct scale_factors;
+struct scale_factors_common {int x_scale_fp; // horizontal fixed point scale factor
int y_scale_fp; // vertical fixed point scale factor
- int x_offset_q4;
int x_step_q4;
- int y_offset_q4;
int y_step_q4;
- int (*scale_value_x)(int val, const struct scale_factors *scale);
- int (*scale_value_y)(int val, const struct scale_factors *scale);
+ int (*scale_value_x)(int val, const struct scale_factors_common *sfc);
+ int (*scale_value_y)(int val, const struct scale_factors_common *sfc);
void (*set_scaled_offsets)(struct scale_factors *scale, int row, int col);
MV32 (*scale_mv)(const MV *mv, const struct scale_factors *scale);
@@ -34,18 +33,25 @@
convolve_fn_t predict[2][2][2]; // horiz, vert, avg
};
+struct scale_factors {+ int x_offset_q4;
+ int y_offset_q4;
+ const struct scale_factors_common *sfc;
+};
+
void vp9_setup_scale_factors_for_frame(struct scale_factors *scale,
+ struct scale_factors_common *scale_comm,
int other_w, int other_h,
int this_w, int this_h);
-static int vp9_is_valid_scale(const struct scale_factors *sf) {- return sf->x_scale_fp != REF_INVALID_SCALE &&
- sf->y_scale_fp != REF_INVALID_SCALE;
+static int vp9_is_valid_scale(const struct scale_factors_common *sfc) {+ return sfc->x_scale_fp != REF_INVALID_SCALE &&
+ sfc->y_scale_fp != REF_INVALID_SCALE;
}
-static int vp9_is_scaled(const struct scale_factors *sf) {- return sf->x_scale_fp != REF_NO_SCALE ||
- sf->y_scale_fp != REF_NO_SCALE;
+static int vp9_is_scaled(const struct scale_factors_common *sfc) {+ return sfc->x_scale_fp != REF_NO_SCALE ||
+ sfc->y_scale_fp != REF_NO_SCALE;
}
#endif // VP9_COMMON_VP9_SCALE_H_
--- a/vp9/decoder/vp9_decodframe.c
+++ b/vp9/decoder/vp9_decodframe.c
@@ -295,13 +295,13 @@
MB_MODE_INFO *const mbmi = &xd->mi_8x8[0]->mbmi;
const int ref = mbmi->ref_frame[idx] - LAST_FRAME;
const YV12_BUFFER_CONFIG *cfg = &cm->yv12_fb[cm->active_ref_idx[ref]];
- const struct scale_factors *sf = &cm->active_ref_scale[ref];
- if (!vp9_is_valid_scale(sf))
+ const struct scale_factors_common *sfc = &cm->active_ref_scale_comm[ref];
+ if (!vp9_is_valid_scale(sfc))
vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM,
"Invalid scale factors");
- xd->scale_factor[idx] = *sf;
- setup_pre_planes(xd, idx, cfg, mi_row, mi_col, sf);
+ xd->scale_factor[idx].sfc = sfc;
+ setup_pre_planes(xd, idx, cfg, mi_row, mi_col, &xd->scale_factor[idx]);
xd->corrupted |= cfg->corrupted;
}
--- a/vp9/encoder/vp9_rdopt.c
+++ b/vp9/encoder/vp9_rdopt.c
@@ -2269,10 +2269,10 @@
scale[frame_type] = cpi->common.active_ref_scale[frame_type - 1];
scale[frame_type].x_offset_q4 =
- ROUND_POWER_OF_TWO(mi_col * MI_SIZE * scale[frame_type].x_scale_fp,
+ ROUND_POWER_OF_TWO(mi_col * MI_SIZE * scale[frame_type].sfc->x_scale_fp,
REF_SCALE_SHIFT) & 0xf;
scale[frame_type].y_offset_q4 =
- ROUND_POWER_OF_TWO(mi_row * MI_SIZE * scale[frame_type].y_scale_fp,
+ ROUND_POWER_OF_TWO(mi_row * MI_SIZE * scale[frame_type].sfc->y_scale_fp,
REF_SCALE_SHIFT) & 0xf;
// TODO(jkoleszar): Is the UV buffer ever used here? If so, need to make this
@@ -2295,7 +2295,7 @@
// Further refinement that is encode side only to test the top few candidates
// in full and choose the best as the centre point for subsequent searches.
// The current implementation doesn't support scaling.
- if (!vp9_is_scaled(&scale[frame_type]) && block_size >= BLOCK_8X8)
+ if (!vp9_is_scaled(scale[frame_type].sfc) && block_size >= BLOCK_8X8)
mv_pred(cpi, x, yv12_mb[frame_type][0].buf, yv12->y_stride,
frame_type, block_size);
}
@@ -2502,9 +2502,9 @@
setup_pre_planes(xd, 1, scaled_ref_frame[1], mi_row, mi_col, NULL);
}
- xd->scale_factor[0].set_scaled_offsets(&xd->scale_factor[0],
+ xd->scale_factor[0].sfc->set_scaled_offsets(&xd->scale_factor[0],
mi_row, mi_col);
- xd->scale_factor[1].set_scaled_offsets(&xd->scale_factor[1],
+ xd->scale_factor[1].sfc->set_scaled_offsets(&xd->scale_factor[1],
mi_row, mi_col);
scaled_first_yv12 = xd->plane[0].pre[0];
@@ -3963,11 +3963,11 @@
// TODO(jingning, jkoleszar): scaling reference frame not supported for
// sub8x8 blocks.
if (ref_frame > 0 &&
- vp9_is_scaled(&scale_factor[ref_frame]))
+ vp9_is_scaled(scale_factor[ref_frame].sfc))
continue;
if (second_ref_frame > 0 &&
- vp9_is_scaled(&scale_factor[second_ref_frame]))
+ vp9_is_scaled(scale_factor[second_ref_frame].sfc))
continue;
set_scale_factors(xd, ref_frame, second_ref_frame, scale_factor);
--- a/vp9/encoder/vp9_temporal_filter.c
+++ b/vp9/encoder/vp9_temporal_filter.c
@@ -38,7 +38,8 @@
int stride,
int mv_row,
int mv_col,
- uint8_t *pred) {+ uint8_t *pred,
+ struct scale_factors *scale) {const int which_mv = 0;
MV mv = { mv_row, mv_col };@@ -45,7 +46,7 @@
vp9_build_inter_predictor(y_mb_ptr, stride,
&pred[0], 16,
&mv,
- &xd->scale_factor[which_mv],
+ scale,
16, 16,
which_mv,
&xd->subpix, MV_PRECISION_Q3);
@@ -55,7 +56,7 @@
vp9_build_inter_predictor(u_mb_ptr, stride,
&pred[256], 8,
&mv,
- &xd->scale_factor[which_mv],
+ scale,
8, 8,
which_mv,
&xd->subpix, MV_PRECISION_Q4);
@@ -63,7 +64,7 @@
vp9_build_inter_predictor(v_mb_ptr, stride,
&pred[320], 8,
&mv,
- &xd->scale_factor[which_mv],
+ scale,
8, 8,
which_mv,
&xd->subpix, MV_PRECISION_Q4);
@@ -186,7 +187,8 @@
static void temporal_filter_iterate_c(VP9_COMP *cpi,
int frame_count,
int alt_ref_index,
- int strength) {+ int strength,
+ struct scale_factors *scale) {int byte;
int frame;
int mb_col, mb_row;
@@ -280,7 +282,7 @@
cpi->frames[frame]->y_stride,
mbd->mi_8x8[0]->bmi[0].as_mv[0].as_mv.row,
mbd->mi_8x8[0]->bmi[0].as_mv[0].as_mv.col,
- predictor);
+ predictor, scale);
// Apply the filter (YUV)
vp9_temporal_filter_apply(f->y_buffer + mb_y_offset, f->y_stride,
@@ -374,6 +376,9 @@
const int num_frames_forward = vp9_lookahead_depth(cpi->lookahead)
- (num_frames_backward + 1);
+ struct scale_factors scale;
+ struct scale_factors_common scale_comm;
+
switch (blur_type) {case 1:
// Backward Blur
@@ -432,7 +437,7 @@
#endif
// Setup scaling factors. Scaling on each of the arnr frames is not supported
- vp9_setup_scale_factors_for_frame(&cpi->mb.e_mbd.scale_factor[0],
+ vp9_setup_scale_factors_for_frame(&scale, &scale_comm,
cm->yv12_fb[cm->new_fb_idx].y_crop_width,
cm->yv12_fb[cm->new_fb_idx].y_crop_height,
cm->width, cm->height);
@@ -447,7 +452,7 @@
}
temporal_filter_iterate_c(cpi, frames_to_blur, frames_to_blur_backward,
- strength);
+ strength, &scale);
}
void configure_arnr_filter(VP9_COMP *cpi, const unsigned int this_frame,