ref: c9130bdbbcf833595d9f3efd9bbcdb51575245d9
dir: /vp8/encoder/segmentation.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 "segmentation.h"
#include "vpx_mem/vpx_mem.h"
void vp8_update_gf_useage_maps(VP8_COMP *cpi, VP8_COMMON *cm, MACROBLOCK *x)
{
int mb_row, mb_col;
MODE_INFO *this_mb_mode_info = cm->mi;
x->gf_active_ptr = (signed char *)cpi->gf_active_flags;
if ((cm->frame_type == KEY_FRAME) || (cm->refresh_golden_frame))
{
// Reset Gf useage monitors
vpx_memset(cpi->gf_active_flags, 1, (cm->mb_rows * cm->mb_cols));
cpi->gf_active_count = cm->mb_rows * cm->mb_cols;
}
else
{
// for each macroblock row in image
for (mb_row = 0; mb_row < cm->mb_rows; mb_row++)
{
// for each macroblock col in image
for (mb_col = 0; mb_col < cm->mb_cols; mb_col++)
{
// If using golden then set GF active flag if not already set.
// If using last frame 0,0 mode then leave flag as it is
// else if using non 0,0 motion or intra modes then clear
// flag if it is currently set
if ((this_mb_mode_info->mbmi.ref_frame == GOLDEN_FRAME) ||
(this_mb_mode_info->mbmi.ref_frame == ALTREF_FRAME))
{
if (*(x->gf_active_ptr) == 0)
{
*(x->gf_active_ptr) = 1;
cpi->gf_active_count ++;
}
}
else if ((this_mb_mode_info->mbmi.mode != ZEROMV) &&
*(x->gf_active_ptr))
{
*(x->gf_active_ptr) = 0;
cpi->gf_active_count--;
}
x->gf_active_ptr++; // Step onto next entry
this_mb_mode_info++; // skip to next mb
}
// this is to account for the border
this_mb_mode_info++;
}
}
}
void vp8_enable_segmentation(VP8_PTR ptr)
{
VP8_COMP *cpi = (VP8_COMP *)(ptr);
// Set the appropriate feature bit
cpi->mb.e_mbd.segmentation_enabled = 1;
cpi->mb.e_mbd.update_mb_segmentation_map = 1;
cpi->mb.e_mbd.update_mb_segmentation_data = 1;
}
void vp8_disable_segmentation(VP8_PTR ptr)
{
VP8_COMP *cpi = (VP8_COMP *)(ptr);
// Clear the appropriate feature bit
cpi->mb.e_mbd.segmentation_enabled = 0;
}
void vp8_set_segmentation_map(VP8_PTR ptr,
unsigned char *segmentation_map)
{
VP8_COMP *cpi = (VP8_COMP *)(ptr);
// Copy in the new segmentation map
vpx_memcpy( cpi->segmentation_map, segmentation_map,
(cpi->common.mb_rows * cpi->common.mb_cols) );
// Signal that the map should be updated.
cpi->mb.e_mbd.update_mb_segmentation_map = 1;
cpi->mb.e_mbd.update_mb_segmentation_data = 1;
}
void vp8_set_segment_data(VP8_PTR ptr,
signed char *feature_data,
unsigned char abs_delta)
{
VP8_COMP *cpi = (VP8_COMP *)(ptr);
cpi->mb.e_mbd.mb_segement_abs_delta = abs_delta;
vpx_memcpy(cpi->mb.e_mbd.segment_feature_data, feature_data,
sizeof(cpi->mb.e_mbd.segment_feature_data));
//#if CONFIG_SEGFEATURES
// TBD ?? Set the feature mask
// vpx_memcpy(cpi->mb.e_mbd.segment_feature_mask, 0,
// sizeof(cpi->mb.e_mbd.segment_feature_mask));
}
#if CONFIG_SEGMENTATION
void choose_segmap_coding_method( VP8_COMP *cpi,
int * segment_counts )
{
VP8_COMMON *const cm = & cpi->common;
MACROBLOCKD *const xd = & cpi->mb.e_mbd;
int tot_count;
int i;
int count1,count2,count3,count4;
int prob[3];
int new_cost, original_cost;
// Select the coding strategy for the segment map (temporal or spatial)
tot_count = segment_counts[12] + segment_counts[13] +
segment_counts[14] + segment_counts[15];
count1 = segment_counts[12] + segment_counts[13];
count2 = segment_counts[14] + segment_counts[15];
if (tot_count)
prob[0] = (count1 * 255) / tot_count;
if (count1 > 0)
prob[1] = (segment_counts[12] * 255) /count1;
if (count2 > 0)
prob[2] = (segment_counts[14] * 255) /count2;
if (cm->frame_type != KEY_FRAME)
{
tot_count = segment_counts[4] + segment_counts[7];
if (tot_count)
xd->mb_segment_tree_probs[3] = (segment_counts[4] * 255)/tot_count;
tot_count = segment_counts[5] + segment_counts[8];
if (tot_count)
xd->mb_segment_tree_probs[4] = (segment_counts[5] * 255)/tot_count;
tot_count = segment_counts[6] + segment_counts[9];
if (tot_count)
xd->mb_segment_tree_probs[5] = (segment_counts[6] * 255)/tot_count;
}
tot_count = segment_counts[0] + segment_counts[1] +
segment_counts[2] + segment_counts[3];
count3 = segment_counts[0] + segment_counts[1];
count4 = segment_counts[2] + segment_counts[3];
if (tot_count)
xd->mb_segment_tree_probs[0] = (count3 * 255) / tot_count;
if (count3 > 0)
xd->mb_segment_tree_probs[1] = (segment_counts[0] * 255) /count3;
if (count4 > 0)
xd->mb_segment_tree_probs[2] = (segment_counts[2] * 255) /count4;
for (i = 0; i < MB_FEATURE_TREE_PROBS+3; i++)
{
if (xd->mb_segment_tree_probs[i] == 0)
xd->mb_segment_tree_probs[i] = 1;
}
original_cost = count1 * vp8_cost_zero(prob[0]) +
count2 * vp8_cost_one(prob[0]);
if (count1 > 0)
original_cost += segment_counts[12] * vp8_cost_zero(prob[1]) +
segment_counts[13] * vp8_cost_one(prob[1]);
if (count2 > 0)
original_cost += segment_counts[14] * vp8_cost_zero(prob[2]) +
segment_counts[15] * vp8_cost_one(prob[2]) ;
new_cost = 0;
if (cm->frame_type != KEY_FRAME)
{
new_cost = segment_counts[4] *
vp8_cost_zero(xd->mb_segment_tree_probs[3]) +
segment_counts[7] *
vp8_cost_one(xd->mb_segment_tree_probs[3]);
new_cost += segment_counts[5] *
vp8_cost_zero(xd->mb_segment_tree_probs[4]) +
segment_counts[8] *
vp8_cost_one(xd->mb_segment_tree_probs[4]);
new_cost += segment_counts[6] *
vp8_cost_zero(xd->mb_segment_tree_probs[5]) +
segment_counts[9] *
vp8_cost_one (xd->mb_segment_tree_probs[5]);
}
if (tot_count > 0)
new_cost += count3 * vp8_cost_zero(xd->mb_segment_tree_probs[0]) +
count4 * vp8_cost_one(xd->mb_segment_tree_probs[0]);
if (count3 > 0)
new_cost += segment_counts[0] *
vp8_cost_zero(xd->mb_segment_tree_probs[1]) +
segment_counts[1] *
vp8_cost_one(xd->mb_segment_tree_probs[1]);
if (count4 > 0)
new_cost += segment_counts[2] *
vp8_cost_zero(xd->mb_segment_tree_probs[2]) +
segment_counts[3] *
vp8_cost_one(xd->mb_segment_tree_probs[2]) ;
if (new_cost < original_cost)
xd->temporal_update = 1;
else
{
xd->temporal_update = 0;
xd->mb_segment_tree_probs[0] = prob[0];
xd->mb_segment_tree_probs[1] = prob[1];
xd->mb_segment_tree_probs[2] = prob[2];
}
}
#endif