generic-library/vpx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Refactor the block decode code to make it simpler.

Browse Source 
Change-Id: I0f983cb821ad7ec6fbefe7895cb8124a8fa39df6
This commit is contained in:
hkuang 2015-03-10 15:37:12 -07:00
parent 066ed601a5
commit 94401aff5c
1 changed files with 13 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
vp9/common/vp9_blockd.c
View File

@ -50,39 +50,25 @@ void vp9_foreach_transformed_block_in_plane(
const int num_4x4_w = num_4x4_blocks_wide_lookup[plane_bsize];
const int num_4x4_h = num_4x4_blocks_high_lookup[plane_bsize];
const int step = 1 << (tx_size << 1);
int i;
int i = 0, r, c;
// If mb_to_right_edge is < 0 we are in a situation in which
// the current block size extends into the UMV and we won't
// visit the sub blocks that are wholly within the UMV.
if (xd->mb_to_right_edge < 0 || xd->mb_to_bottom_edge < 0) {
int r, c;
const int max_blocks_wide = num_4x4_w + (xd->mb_to_right_edge >= 0 ? 0 :
xd->mb_to_right_edge >> (5 + pd->subsampling_x));
const int max_blocks_high = num_4x4_h + (xd->mb_to_bottom_edge >= 0 ? 0 :
xd->mb_to_bottom_edge >> (5 + pd->subsampling_x));
int max_blocks_wide = num_4x4_w;
int max_blocks_high = num_4x4_h;
// xd->mb_to_right_edge is in units of pixels * 8. This converts
// it to 4x4 block sizes.
if (xd->mb_to_right_edge < 0)
max_blocks_wide += (xd->mb_to_right_edge >> (5 + pd->subsampling_x));
if (xd->mb_to_bottom_edge < 0)
max_blocks_high += (xd->mb_to_bottom_edge >> (5 + pd->subsampling_y));
i = 0;
// Unlike the normal case - in here we have to keep track of the
// row and column of the blocks we use so that we know if we are in
// the unrestricted motion border.
for (r = 0; r < num_4x4_h; r += (1 << tx_size)) {
for (c = 0; c < num_4x4_w; c += (1 << tx_size)) {
if (r < max_blocks_high && c < max_blocks_wide)
visit(plane, i, plane_bsize, tx_size, arg);
i += step;
}
// Keep track of the row and column of the blocks we use so that we know
// if we are in the unrestricted motion border.
for (r = 0; r < max_blocks_high; r += (1 << tx_size)) {
for (c = 0; c < num_4x4_w; c += (1 << tx_size)) {
// Skip visiting the sub blocks that are wholly within the UMV.
if (c < max_blocks_wide)
visit(plane, i, plane_bsize, tx_size, arg);
i += step;
}
} else {
for (i = 0; i < num_4x4_w * num_4x4_h; i += step)
visit(plane, i, plane_bsize, tx_size, arg);
}
}