// Prior to coding a given prediction block, of size bsize at (mi_row, mi_col),
// check if we should reset the segment_id, and update the cyclic_refresh map
// and segmentation map.
void vp9_cyclic_refresh_update_segment(VP9_COMP *const cpi, MODE_INFO *const mi,
int mi_row, int mi_col, BLOCK_SIZE bsize,
int64_t rate, int64_t dist, int skip,
struct macroblock_plane *const p) {
const VP9_COMMON *const cm = &cpi->common;
CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
const int bw = num_8x8_blocks_wide_lookup[bsize];
const int bh = num_8x8_blocks_high_lookup[bsize];
const int xmis = VPXMIN(cm->mi_cols - mi_col, bw);
const int ymis = VPXMIN(cm->mi_rows - mi_row, bh);
const int block_index = mi_row * cm->mi_cols + mi_col;
int refresh_this_block = candidate_refresh_aq(cr, mi, rate, dist, bsize);
// Default is to not update the refresh map.
int new_map_value = cr->map[block_index];
int x = 0;
int y = 0;
int is_skin = 0;
if (refresh_this_block == 0 && bsize <= BLOCK_16X16 &&
cpi->use_skin_detection) {
is_skin =
vp9_compute_skin_block(p[0].src.buf, p[1].src.buf, p[2].src.buf,
p[0].src.stride, p[1].src.stride, bsize, 0, 0);
if (is_skin) refresh_this_block = 1;
}
if (cpi->oxcf.rc_mode == VPX_VBR && mi->ref_frame[0] == GOLDEN_FRAME)
refresh_this_block = 0;
// If this block is labeled for refresh, check if we should reset the
// segment_id.
if (cyclic_refresh_segment_id_boosted(mi->segment_id)) {
mi->segment_id = refresh_this_block;
// Reset segment_id if it will be skipped.
if (skip) mi->segment_id = CR_SEGMENT_ID_BASE;
}
// Update the cyclic refresh map, to be used for setting segmentation map
// for the next frame. If the block will be refreshed this frame, mark it
// as clean. The magnitude of the -ve influences how long before we consider
// it for refresh again.
if (cyclic_refresh_segment_id_boosted(mi->segment_id)) {
new_map_value = -cr->time_for_refresh;
} else if (refresh_this_block) {
// Else if it is accepted as candidate for refresh, and has not already
// been refreshed (marked as 1) then mark it as a candidate for cleanup
// for future time (marked as 0), otherwise don't update it.
if (cr->map[block_index] == 1) new_map_value = 0;
} else {
// Leave it marked as block that is not candidate for refresh.
new_map_value = 1;
}
// Update entries in the cyclic refresh map with new_map_value, and
// copy mbmi->segment_id into global segmentation map.
for (y = 0; y < ymis; y++)
for (x = 0; x < xmis; x++) {
int map_offset = block_index + y * cm->mi_cols + x;
cr->map[map_offset] = new_map_value;
cpi->segmentation_map[map_offset] = mi->segment_id;
}
}
void vp9_compute_skin_sb(VP9_COMP *const cpi, BLOCK_SIZE bsize, int mi_row,
int mi_col) {
int i, j, num_bl;
VP9_COMMON *const cm = &cpi->common;
const uint8_t *src_y = cpi->Source->y_buffer;
const uint8_t *src_u = cpi->Source->u_buffer;
const uint8_t *src_v = cpi->Source->v_buffer;
const int src_ystride = cpi->Source->y_stride;
const int src_uvstride = cpi->Source->uv_stride;
const int y_bsize = 4 << b_width_log2_lookup[bsize];
const int uv_bsize = y_bsize >> 1;
const int shy = (y_bsize == 8) ? 3 : 4;
const int shuv = shy - 1;
const int fac = y_bsize / 8;
const int y_shift = src_ystride * (mi_row << 3) + (mi_col << 3);
const int uv_shift = src_uvstride * (mi_row << 2) + (mi_col << 2);
const int mi_row_limit = VPXMIN(mi_row + 8, cm->mi_rows - 2);
const int mi_col_limit = VPXMIN(mi_col + 8, cm->mi_cols - 2);
src_y += y_shift;
src_u += uv_shift;
src_v += uv_shift;
for (i = mi_row; i < mi_row_limit; i += fac) {
num_bl = 0;
for (j = mi_col; j < mi_col_limit; j += fac) {
int consec_zeromv = 0;
int bl_index = i * cm->mi_cols + j;
int bl_index1 = bl_index + 1;
int bl_index2 = bl_index + cm->mi_cols;
int bl_index3 = bl_index2 + 1;
// Don't detect skin on the boundary.
if (i == 0 || j == 0) continue;
if (bsize == BLOCK_8X8)
consec_zeromv = cpi->consec_zero_mv[bl_index];
else
consec_zeromv = VPXMIN(cpi->consec_zero_mv[bl_index],
VPXMIN(cpi->consec_zero_mv[bl_index1],
VPXMIN(cpi->consec_zero_mv[bl_index2],
cpi->consec_zero_mv[bl_index3])));
cpi->skin_map[bl_index] =
vp9_compute_skin_block(src_y, src_u, src_v, src_ystride, src_uvstride,
bsize, consec_zeromv, 0);
num_bl++;
src_y += y_bsize;
src_u += uv_bsize;
src_v += uv_bsize;
}
src_y += (src_ystride << shy) - (num_bl << shy);
src_u += (src_uvstride << shuv) - (num_bl << shuv);
src_v += (src_uvstride << shuv) - (num_bl << shuv);
}
// Remove isolated skin blocks (none of its neighbors are skin) and isolated
// non-skin blocks (all of its neighbors are skin).
// Skip 4 corner blocks which have only 3 neighbors to remove isolated skin
// blocks. Skip superblock borders to remove isolated non-skin blocks.
for (i = mi_row; i < mi_row_limit; i += fac) {
for (j = mi_col; j < mi_col_limit; j += fac) {
int bl_index = i * cm->mi_cols + j;
int num_neighbor = 0;
int mi, mj;
int non_skin_threshold = 8;
// Skip 4 corners.
if ((i == mi_row && (j == mi_col || j == mi_col_limit - fac)) ||
(i == mi_row_limit - fac && (j == mi_col || j == mi_col_limit - fac)))
continue;
// There are only 5 neighbors for non-skin blocks on the border.
if (i == mi_row || i == mi_row_limit - fac || j == mi_col ||
j == mi_col_limit - fac)
non_skin_threshold = 5;
for (mi = -fac; mi <= fac; mi += fac) {
for (mj = -fac; mj <= fac; mj += fac) {
if (i + mi >= mi_row && i + mi < mi_row_limit && j + mj >= mi_col &&
j + mj < mi_col_limit) {
int bl_neighbor_index = (i + mi) * cm->mi_cols + j + mj;
if (cpi->skin_map[bl_neighbor_index]) num_neighbor++;
}
}
}
if (cpi->skin_map[bl_index] && num_neighbor < 2)
cpi->skin_map[bl_index] = 0;
if (!cpi->skin_map[bl_index] && num_neighbor == non_skin_threshold)
cpi->skin_map[bl_index] = 1;
}
}
}
