ref: 67aa6c8c23bc6ca90cfde756015f0aae61fe20f7
dir: /vp9/encoder/vp9_mbgraph.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 <limits.h>
#include "./vp9_rtcd.h"
#include "./vpx_dsp_rtcd.h"
#include "vpx_dsp/vpx_dsp_common.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/system_state.h"
#include "vp9/encoder/vp9_segmentation.h"
#include "vp9/encoder/vp9_mcomp.h"
#include "vp9/common/vp9_blockd.h"
#include "vp9/common/vp9_reconinter.h"
#include "vp9/common/vp9_reconintra.h"
static unsigned int do_16x16_motion_iteration(VP9_COMP *cpi, const MV *ref_mv,
MV *dst_mv, int mb_row,
int mb_col) {
MACROBLOCK *const x = &cpi->td.mb;
MACROBLOCKD *const xd = &x->e_mbd;
MV_SPEED_FEATURES *const mv_sf = &cpi->sf.mv;
const SEARCH_METHODS old_search_method = mv_sf->search_method;
const vp9_variance_fn_ptr_t v_fn_ptr = cpi->fn_ptr[BLOCK_16X16];
const MvLimits tmp_mv_limits = x->mv_limits;
MV ref_full;
int cost_list[5];
// Further step/diamond searches as necessary
int step_param = mv_sf->reduce_first_step_size;
step_param = VPXMIN(step_param, MAX_MVSEARCH_STEPS - 2);
vp9_set_mv_search_range(&x->mv_limits, ref_mv);
ref_full.col = ref_mv->col >> 3;
ref_full.row = ref_mv->row >> 3;
mv_sf->search_method = HEX;
vp9_full_pixel_search(cpi, x, BLOCK_16X16, &ref_full, step_param,
cpi->sf.mv.search_method, x->errorperbit,
cond_cost_list(cpi, cost_list), ref_mv, dst_mv, 0, 0);
mv_sf->search_method = old_search_method;
/* restore UMV window */
x->mv_limits = tmp_mv_limits;
// Try sub-pixel MC
// if (bestsme > error_thresh && bestsme < INT_MAX)
{
uint32_t distortion;
uint32_t sse;
// TODO(yunqing): may use higher tap interp filter than 2 taps if needed.
cpi->find_fractional_mv_step(
x, dst_mv, ref_mv, cpi->common.allow_high_precision_mv, x->errorperbit,
&v_fn_ptr, 0, mv_sf->subpel_search_level,
cond_cost_list(cpi, cost_list), NULL, NULL, &distortion, &sse, NULL, 0,
0, USE_2_TAPS);
}
xd->mi[0]->mode = NEWMV;
xd->mi[0]->mv[0].as_mv = *dst_mv;
vp9_build_inter_predictors_sby(xd, mb_row, mb_col, BLOCK_16X16);
return vpx_sad16x16(x->plane[0].src.buf, x->plane[0].src.stride,
xd->plane[0].dst.buf, xd->plane[0].dst.stride);
}
static int do_16x16_motion_search(VP9_COMP *cpi, const MV *ref_mv,
int_mv *dst_mv, int mb_row, int mb_col) {
MACROBLOCK *const x = &cpi->td.mb;
MACROBLOCKD *const xd = &x->e_mbd;
unsigned int err, tmp_err;
MV tmp_mv;
// Try zero MV first
// FIXME should really use something like near/nearest MV and/or MV prediction
err = vpx_sad16x16(x->plane[0].src.buf, x->plane[0].src.stride,
xd->plane[0].pre[0].buf, xd->plane[0].pre[0].stride);
dst_mv->as_int = 0;
// Test last reference frame using the previous best mv as the
// starting point (best reference) for the search
tmp_err = do_16x16_motion_iteration(cpi, ref_mv, &tmp_mv, mb_row, mb_col);
if (tmp_err < err) {
err = tmp_err;
dst_mv->as_mv = tmp_mv;
}
// If the current best reference mv is not centered on 0,0 then do a 0,0
// based search as well.
if (ref_mv->row != 0 || ref_mv->col != 0) {
unsigned int tmp_err;
MV zero_ref_mv = { 0, 0 }, tmp_mv;
tmp_err =
do_16x16_motion_iteration(cpi, &zero_ref_mv, &tmp_mv, mb_row, mb_col);
if (tmp_err < err) {
dst_mv->as_mv = tmp_mv;
err = tmp_err;
}
}
return err;
}
static int do_16x16_zerozero_search(VP9_COMP *cpi, int_mv *dst_mv) {
MACROBLOCK *const x = &cpi->td.mb;
MACROBLOCKD *const xd = &x->e_mbd;
unsigned int err;
// Try zero MV first
// FIXME should really use something like near/nearest MV and/or MV prediction
err = vpx_sad16x16(x->plane[0].src.buf, x->plane[0].src.stride,
xd->plane[0].pre[0].buf, xd->plane[0].pre[0].stride);
dst_mv->as_int = 0;
return err;
}
static int find_best_16x16_intra(VP9_COMP *cpi, PREDICTION_MODE *pbest_mode) {
MACROBLOCK *const x = &cpi->td.mb;
MACROBLOCKD *const xd = &x->e_mbd;
PREDICTION_MODE best_mode = -1, mode;
unsigned int best_err = INT_MAX;
// calculate SATD for each intra prediction mode;
// we're intentionally not doing 4x4, we just want a rough estimate
for (mode = DC_PRED; mode <= TM_PRED; mode++) {
unsigned int err;
xd->mi[0]->mode = mode;
vp9_predict_intra_block(xd, 2, TX_16X16, mode, x->plane[0].src.buf,
x->plane[0].src.stride, xd->plane[0].dst.buf,
xd->plane[0].dst.stride, 0, 0, 0);
err = vpx_sad16x16(x->plane[0].src.buf, x->plane[0].src.stride,
xd->plane[0].dst.buf, xd->plane[0].dst.stride);
// find best
if (err < best_err) {
best_err = err;
best_mode = mode;
}
}
if (pbest_mode) *pbest_mode = best_mode;
return best_err;
}
static void update_mbgraph_mb_stats(VP9_COMP *cpi, MBGRAPH_MB_STATS *stats,
YV12_BUFFER_CONFIG *buf, int mb_y_offset,
YV12_BUFFER_CONFIG *golden_ref,
const MV *prev_golden_ref_mv,
YV12_BUFFER_CONFIG *alt_ref, int mb_row,
int mb_col) {
MACROBLOCK *const x = &cpi->td.mb;
MACROBLOCKD *const xd = &x->e_mbd;
int intra_error;
VP9_COMMON *cm = &cpi->common;
// FIXME in practice we're completely ignoring chroma here
x->plane[0].src.buf = buf->y_buffer + mb_y_offset;
x->plane[0].src.stride = buf->y_stride;
xd->plane[0].dst.buf = get_frame_new_buffer(cm)->y_buffer + mb_y_offset;
xd->plane[0].dst.stride = get_frame_new_buffer(cm)->y_stride;
// do intra 16x16 prediction
intra_error = find_best_16x16_intra(cpi, &stats->ref[INTRA_FRAME].m.mode);
if (intra_error <= 0) intra_error = 1;
stats->ref[INTRA_FRAME].err = intra_error;
// Golden frame MV search, if it exists and is different than last frame
if (golden_ref) {
int g_motion_error;
xd->plane[0].pre[0].buf = golden_ref->y_buffer + mb_y_offset;
xd->plane[0].pre[0].stride = golden_ref->y_stride;
g_motion_error =
do_16x16_motion_search(cpi, prev_golden_ref_mv,
&stats->ref[GOLDEN_FRAME].m.mv, mb_row, mb_col);
stats->ref[GOLDEN_FRAME].err = g_motion_error;
} else {
stats->ref[GOLDEN_FRAME].err = INT_MAX;
stats->ref[GOLDEN_FRAME].m.mv.as_int = 0;
}
// Do an Alt-ref frame MV search, if it exists and is different than
// last/golden frame.
if (alt_ref) {
int a_motion_error;
xd->plane[0].pre[0].buf = alt_ref->y_buffer + mb_y_offset;
xd->plane[0].pre[0].stride = alt_ref->y_stride;
a_motion_error =
do_16x16_zerozero_search(cpi, &stats->ref[ALTREF_FRAME].m.mv);
stats->ref[ALTREF_FRAME].err = a_motion_error;
} else {
stats->ref[ALTREF_FRAME].err = INT_MAX;
stats->ref[ALTREF_FRAME].m.mv.as_int = 0;
}
}
static void update_mbgraph_frame_stats(VP9_COMP *cpi,
MBGRAPH_FRAME_STATS *stats,
YV12_BUFFER_CONFIG *buf,
YV12_BUFFER_CONFIG *golden_ref,
YV12_BUFFER_CONFIG *alt_ref) {
MACROBLOCK *const x = &cpi->td.mb;
MACROBLOCKD *const xd = &x->e_mbd;
VP9_COMMON *const cm = &cpi->common;
int mb_col, mb_row, offset = 0;
int mb_y_offset = 0, arf_y_offset = 0, gld_y_offset = 0;
MV gld_top_mv = { 0, 0 };
MODE_INFO mi_local;
MODE_INFO mi_above, mi_left;
vp9_zero(mi_local);
// Set up limit values for motion vectors to prevent them extending outside
// the UMV borders.
x->mv_limits.row_min = -BORDER_MV_PIXELS_B16;
x->mv_limits.row_max = (cm->mb_rows - 1) * 8 + BORDER_MV_PIXELS_B16;
// Signal to vp9_predict_intra_block() that above is not available
xd->above_mi = NULL;
xd->plane[0].dst.stride = buf->y_stride;
xd->plane[0].pre[0].stride = buf->y_stride;
xd->plane[1].dst.stride = buf->uv_stride;
xd->mi[0] = &mi_local;
mi_local.sb_type = BLOCK_16X16;
mi_local.ref_frame[0] = LAST_FRAME;
mi_local.ref_frame[1] = NONE;
for (mb_row = 0; mb_row < cm->mb_rows; mb_row++) {
MV gld_left_mv = gld_top_mv;
int mb_y_in_offset = mb_y_offset;
int arf_y_in_offset = arf_y_offset;
int gld_y_in_offset = gld_y_offset;
// Set up limit values for motion vectors to prevent them extending outside
// the UMV borders.
x->mv_limits.col_min = -BORDER_MV_PIXELS_B16;
x->mv_limits.col_max = (cm->mb_cols - 1) * 8 + BORDER_MV_PIXELS_B16;
// Signal to vp9_predict_intra_block() that left is not available
xd->left_mi = NULL;
for (mb_col = 0; mb_col < cm->mb_cols; mb_col++) {
MBGRAPH_MB_STATS *mb_stats = &stats->mb_stats[offset + mb_col];
update_mbgraph_mb_stats(cpi, mb_stats, buf, mb_y_in_offset, golden_ref,
&gld_left_mv, alt_ref, mb_row, mb_col);
gld_left_mv = mb_stats->ref[GOLDEN_FRAME].m.mv.as_mv;
if (mb_col == 0) {
gld_top_mv = gld_left_mv;
}
// Signal to vp9_predict_intra_block() that left is available
xd->left_mi = &mi_left;
mb_y_in_offset += 16;
gld_y_in_offset += 16;
arf_y_in_offset += 16;
x->mv_limits.col_min -= 16;
x->mv_limits.col_max -= 16;
}
// Signal to vp9_predict_intra_block() that above is available
xd->above_mi = &mi_above;
mb_y_offset += buf->y_stride * 16;
gld_y_offset += golden_ref->y_stride * 16;
if (alt_ref) arf_y_offset += alt_ref->y_stride * 16;
x->mv_limits.row_min -= 16;
x->mv_limits.row_max -= 16;
offset += cm->mb_cols;
}
}
// void separate_arf_mbs_byzz
static void separate_arf_mbs(VP9_COMP *cpi) {
VP9_COMMON *const cm = &cpi->common;
int mb_col, mb_row, offset, i;
int mi_row, mi_col;
int ncnt[4] = { 0 };
int n_frames = cpi->mbgraph_n_frames;
int *arf_not_zz;
CHECK_MEM_ERROR(
cm, arf_not_zz,
vpx_calloc(cm->mb_rows * cm->mb_cols * sizeof(*arf_not_zz), 1));
// We are not interested in results beyond the alt ref itself.
if (n_frames > cpi->rc.frames_till_gf_update_due)
n_frames = cpi->rc.frames_till_gf_update_due;
// defer cost to reference frames
for (i = n_frames - 1; i >= 0; i--) {
MBGRAPH_FRAME_STATS *frame_stats = &cpi->mbgraph_stats[i];
for (offset = 0, mb_row = 0; mb_row < cm->mb_rows;
offset += cm->mb_cols, mb_row++) {
for (mb_col = 0; mb_col < cm->mb_cols; mb_col++) {
MBGRAPH_MB_STATS *mb_stats = &frame_stats->mb_stats[offset + mb_col];
int altref_err = mb_stats->ref[ALTREF_FRAME].err;
int intra_err = mb_stats->ref[INTRA_FRAME].err;
int golden_err = mb_stats->ref[GOLDEN_FRAME].err;
// Test for altref vs intra and gf and that its mv was 0,0.
if (altref_err > 1000 || altref_err > intra_err ||
altref_err > golden_err) {
arf_not_zz[offset + mb_col]++;
}
}
}
}
// arf_not_zz is indexed by MB, but this loop is indexed by MI to avoid out
// of bound access in segmentation_map
for (mi_row = 0; mi_row < cm->mi_rows; mi_row++) {
for (mi_col = 0; mi_col < cm->mi_cols; mi_col++) {
// If any of the blocks in the sequence failed then the MB
// goes in segment 0
if (arf_not_zz[mi_row / 2 * cm->mb_cols + mi_col / 2]) {
ncnt[0]++;
cpi->segmentation_map[mi_row * cm->mi_cols + mi_col] = 0;
} else {
cpi->segmentation_map[mi_row * cm->mi_cols + mi_col] = 1;
ncnt[1]++;
}
}
}
// Only bother with segmentation if over 10% of the MBs in static segment
// if ( ncnt[1] && (ncnt[0] / ncnt[1] < 10) )
if (1) {
// Note % of blocks that are marked as static
if (cm->MBs)
cpi->static_mb_pct = (ncnt[1] * 100) / (cm->mi_rows * cm->mi_cols);
// This error case should not be reachable as this function should
// never be called with the common data structure uninitialized.
else
cpi->static_mb_pct = 0;
vp9_enable_segmentation(&cm->seg);
} else {
cpi->static_mb_pct = 0;
vp9_disable_segmentation(&cm->seg);
}
// Free localy allocated storage
vpx_free(arf_not_zz);
}
void vp9_update_mbgraph_stats(VP9_COMP *cpi) {
VP9_COMMON *const cm = &cpi->common;
int i, n_frames = vp9_lookahead_depth(cpi->lookahead);
YV12_BUFFER_CONFIG *golden_ref = get_ref_frame_buffer(cpi, GOLDEN_FRAME);
assert(golden_ref != NULL);
// we need to look ahead beyond where the ARF transitions into
// being a GF - so exit if we don't look ahead beyond that
if (n_frames <= cpi->rc.frames_till_gf_update_due) return;
if (n_frames > MAX_LAG_BUFFERS) n_frames = MAX_LAG_BUFFERS;
cpi->mbgraph_n_frames = n_frames;
for (i = 0; i < n_frames; i++) {
MBGRAPH_FRAME_STATS *frame_stats = &cpi->mbgraph_stats[i];
memset(frame_stats->mb_stats, 0,
cm->mb_rows * cm->mb_cols * sizeof(*cpi->mbgraph_stats[i].mb_stats));
}
// do motion search to find contribution of each reference to data
// later on in this GF group
// FIXME really, the GF/last MC search should be done forward, and
// the ARF MC search backwards, to get optimal results for MV caching
for (i = 0; i < n_frames; i++) {
MBGRAPH_FRAME_STATS *frame_stats = &cpi->mbgraph_stats[i];
struct lookahead_entry *q_cur = vp9_lookahead_peek(cpi->lookahead, i);
assert(q_cur != NULL);
update_mbgraph_frame_stats(cpi, frame_stats, &q_cur->img, golden_ref,
cpi->Source);
}
vpx_clear_system_state();
separate_arf_mbs(cpi);
}