f167433d9c
The following issue was reported : https://code.google.com/p/webm/issues/detail?id=601&q=jimbankoski&sort=-id&colspec=ID%20Pri%20mstone%20ReleaseBlock%20Type%20Component%20Status%20Owner%20Summary This code makes the choice and code cleaner and removes any question about whether the border needs to be checked. Change-Id: Ia7aecfb3168e340618805bd318499176c2989597
295 lines
10 KiB
C
295 lines
10 KiB
C
/*
|
|
* Copyright (c) 2012 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 "vp9/common/vp9_mvref_common.h"
|
|
|
|
#define MVREF_NEIGHBOURS 8
|
|
|
|
typedef enum {
|
|
BOTH_ZERO = 0,
|
|
ZERO_PLUS_PREDICTED = 1,
|
|
BOTH_PREDICTED = 2,
|
|
NEW_PLUS_NON_INTRA = 3,
|
|
BOTH_NEW = 4,
|
|
INTRA_PLUS_NON_INTRA = 5,
|
|
BOTH_INTRA = 6,
|
|
INVALID_CASE = 9
|
|
} motion_vector_context;
|
|
|
|
// This is used to figure out a context for the ref blocks. The code flattens
|
|
// an array that would have 3 possible counts (0, 1 & 2) for 3 choices by
|
|
// adding 9 for each intra block, 3 for each zero mv and 1 for each new
|
|
// motion vector. This single number is then converted into a context
|
|
// with a single lookup ( counter_to_context ).
|
|
static const int mode_2_counter[MB_MODE_COUNT] = {
|
|
9, // DC_PRED
|
|
9, // V_PRED
|
|
9, // H_PRED
|
|
9, // D45_PRED
|
|
9, // D135_PRED
|
|
9, // D117_PRED
|
|
9, // D153_PRED
|
|
9, // D27_PRED
|
|
9, // D63_PRED
|
|
9, // TM_PRED
|
|
0, // NEARESTMV
|
|
0, // NEARMV
|
|
3, // ZEROMV
|
|
1, // NEWMV
|
|
};
|
|
|
|
// There are 3^3 different combinations of 3 counts that can be either 0,1 or
|
|
// 2. However the actual count can never be greater than 2 so the highest
|
|
// counter we need is 18. 9 is an invalid counter that's never used.
|
|
static const int counter_to_context[19] = {
|
|
BOTH_PREDICTED, // 0
|
|
NEW_PLUS_NON_INTRA, // 1
|
|
BOTH_NEW, // 2
|
|
ZERO_PLUS_PREDICTED, // 3
|
|
NEW_PLUS_NON_INTRA, // 4
|
|
INVALID_CASE, // 5
|
|
BOTH_ZERO, // 6
|
|
INVALID_CASE, // 7
|
|
INVALID_CASE, // 8
|
|
INTRA_PLUS_NON_INTRA, // 9
|
|
INTRA_PLUS_NON_INTRA, // 10
|
|
INVALID_CASE, // 11
|
|
INTRA_PLUS_NON_INTRA, // 12
|
|
INVALID_CASE, // 13
|
|
INVALID_CASE, // 14
|
|
INVALID_CASE, // 15
|
|
INVALID_CASE, // 16
|
|
INVALID_CASE, // 17
|
|
BOTH_INTRA // 18
|
|
};
|
|
|
|
static const MV mv_ref_blocks[BLOCK_SIZES][MVREF_NEIGHBOURS] = {
|
|
// 4X4
|
|
{{-1, 0}, {0, -1}, {-1, -1}, {-2, 0}, {0, -2}, {-2, -1}, {-1, -2}, {-2, -2}},
|
|
// 4X8
|
|
{{-1, 0}, {0, -1}, {-1, -1}, {-2, 0}, {0, -2}, {-2, -1}, {-1, -2}, {-2, -2}},
|
|
// 8X4
|
|
{{-1, 0}, {0, -1}, {-1, -1}, {-2, 0}, {0, -2}, {-2, -1}, {-1, -2}, {-2, -2}},
|
|
// 8X8
|
|
{{-1, 0}, {0, -1}, {-1, -1}, {-2, 0}, {0, -2}, {-2, -1}, {-1, -2}, {-2, -2}},
|
|
// 8X16
|
|
{{0, -1}, {-1, 0}, {1, -1}, {-1, -1}, {0, -2}, {-2, 0}, {-2, -1}, {-1, -2}},
|
|
// 16X8
|
|
{{-1, 0}, {0, -1}, {-1, 1}, {-1, -1}, {-2, 0}, {0, -2}, {-1, -2}, {-2, -1}},
|
|
// 16X16
|
|
{{-1, 0}, {0, -1}, {-1, 1}, {1, -1}, {-1, -1}, {-3, 0}, {0, -3}, {-3, -3}},
|
|
// 16X32
|
|
{{0, -1}, {-1, 0}, {2, -1}, {-1, -1}, {-1, 1}, {0, -3}, {-3, 0}, {-3, -3}},
|
|
// 32X16
|
|
{{-1, 0}, {0, -1}, {-1, 2}, {-1, -1}, {1, -1}, {-3, 0}, {0, -3}, {-3, -3}},
|
|
// 32X32
|
|
{{-1, 1}, {1, -1}, {-1, 2}, {2, -1}, {-1, -1}, {-3, 0}, {0, -3}, {-3, -3}},
|
|
// 32X64
|
|
{{0, -1}, {-1, 0}, {4, -1}, {-1, 2}, {-1, -1}, {0, -3}, {-3, 0}, {2, -1}},
|
|
// 64X32
|
|
{{-1, 0}, {0, -1}, {-1, 4}, {2, -1}, {-1, -1}, {-3, 0}, {0, -3}, {-1, 2}},
|
|
// 64X64
|
|
{{-1, 3}, {3, -1}, {-1, 4}, {4, -1}, {-1, -1}, {-1, 0}, {0, -1}, {-1, 6}}
|
|
};
|
|
|
|
static const int idx_n_column_to_subblock[4][2] = {
|
|
{1, 2},
|
|
{1, 3},
|
|
{3, 2},
|
|
{3, 3}
|
|
};
|
|
|
|
// clamp_mv_ref
|
|
#define MV_BORDER (16 << 3) // Allow 16 pels in 1/8th pel units
|
|
|
|
static void clamp_mv_ref(MV *mv, const MACROBLOCKD *xd) {
|
|
clamp_mv(mv, xd->mb_to_left_edge - MV_BORDER,
|
|
xd->mb_to_right_edge + MV_BORDER,
|
|
xd->mb_to_top_edge - MV_BORDER,
|
|
xd->mb_to_bottom_edge + MV_BORDER);
|
|
}
|
|
|
|
// This function returns either the appropriate sub block or block's mv
|
|
// on whether the block_size < 8x8 and we have check_sub_blocks set.
|
|
static INLINE int_mv get_sub_block_mv(const MODE_INFO *candidate,
|
|
int check_sub_blocks, int which_mv,
|
|
int search_col, int block_idx) {
|
|
return (check_sub_blocks && candidate->mbmi.sb_type < BLOCK_8X8
|
|
? candidate->bmi[idx_n_column_to_subblock[block_idx][search_col == 0]]
|
|
.as_mv[which_mv]
|
|
: candidate->mbmi.mv[which_mv]);
|
|
}
|
|
|
|
|
|
// Performs mv sign inversion if indicated by the reference frame combination.
|
|
static INLINE int_mv scale_mv(const MB_MODE_INFO *mbmi, int ref,
|
|
const MV_REFERENCE_FRAME this_ref_frame,
|
|
const int *ref_sign_bias) {
|
|
int_mv mv = mbmi->mv[ref];
|
|
if (ref_sign_bias[mbmi->ref_frame[ref]] != ref_sign_bias[this_ref_frame]) {
|
|
mv.as_mv.row *= -1;
|
|
mv.as_mv.col *= -1;
|
|
}
|
|
return mv;
|
|
}
|
|
|
|
// This macro is used to add a motion vector mv_ref list if it isn't
|
|
// already in the list. If it's the second motion vector it will also
|
|
// skip all additional processing and jump to done!
|
|
#define ADD_MV_REF_LIST(MV) \
|
|
if (refmv_count) { \
|
|
if ((MV).as_int != mv_ref_list[0].as_int) { \
|
|
mv_ref_list[refmv_count] = (MV); \
|
|
goto Done; \
|
|
} \
|
|
} else { \
|
|
mv_ref_list[refmv_count++] = (MV); \
|
|
}
|
|
|
|
// If either reference frame is different, not INTRA, and they
|
|
// are different from each other scale and add the mv to our list.
|
|
#define IF_DIFF_REF_FRAME_ADD_MV(CANDIDATE) \
|
|
if ((CANDIDATE)->ref_frame[0] != ref_frame) { \
|
|
ADD_MV_REF_LIST(scale_mv((CANDIDATE), 0, ref_frame, ref_sign_bias)); \
|
|
} \
|
|
if ((CANDIDATE)->ref_frame[1] != ref_frame && \
|
|
(CANDIDATE)->ref_frame[1] > INTRA_FRAME && \
|
|
(CANDIDATE)->mv[1].as_int != (CANDIDATE)->mv[0].as_int) { \
|
|
ADD_MV_REF_LIST(scale_mv((CANDIDATE), 1, ref_frame, ref_sign_bias)); \
|
|
}
|
|
|
|
// Checks that the given mi_row, mi_col and search point
|
|
// are inside the borders of the tile.
|
|
static INLINE int is_inside(int mi_col, int mi_row,
|
|
int cur_tile_mi_col_start,
|
|
int cur_tile_mi_col_end,
|
|
int mi_rows,
|
|
const MV *mv_ref) {
|
|
return !(mi_row + mv_ref->row < 0 ||
|
|
mi_col + mv_ref->col < cur_tile_mi_col_start ||
|
|
mi_row + mv_ref->row >= mi_rows ||
|
|
mi_col + mv_ref->col >= cur_tile_mi_col_end);
|
|
}
|
|
|
|
// This function searches the neighbourhood of a given MB/SB
|
|
// to try and find candidate reference vectors.
|
|
void vp9_find_mv_refs_idx(VP9_COMMON *cm, MACROBLOCKD *xd, MODE_INFO *here,
|
|
const MODE_INFO *lf_here,
|
|
const MV_REFERENCE_FRAME ref_frame,
|
|
int_mv *mv_ref_list, const int *ref_sign_bias,
|
|
const int block_idx,
|
|
const int mi_row, const int mi_col) {
|
|
int idx;
|
|
MB_MODE_INFO *mbmi = &xd->mode_info_context->mbmi;
|
|
int refmv_count = 0;
|
|
const MV *mv_ref_search = mv_ref_blocks[mbmi->sb_type];
|
|
const MODE_INFO *candidate;
|
|
const int check_sub_blocks = block_idx >= 0;
|
|
int different_ref_found = 0;
|
|
int context_counter = 0;
|
|
|
|
// Blank the reference vector list
|
|
vpx_memset(mv_ref_list, 0, sizeof(*mv_ref_list) * MAX_MV_REF_CANDIDATES);
|
|
|
|
// The nearest 2 blocks are treated differently
|
|
// if the size < 8x8 we get the mv from the bmi substructure,
|
|
// and we also need to keep a mode count.
|
|
for (idx = 0; idx < 2; ++idx) {
|
|
const MV *mv_ref = &mv_ref_search[idx];
|
|
|
|
if (!is_inside(mi_col, mi_row, cm->cur_tile_mi_col_start,
|
|
cm->cur_tile_mi_col_end, cm->mi_rows, mv_ref))
|
|
continue;
|
|
|
|
candidate = here + mv_ref->col + mv_ref->row * xd->mode_info_stride;
|
|
|
|
// Keep counts for entropy encoding.
|
|
context_counter += mode_2_counter[candidate->mbmi.mode];
|
|
|
|
// Check if the candidate comes from the same reference frame.
|
|
if (candidate->mbmi.ref_frame[0] == ref_frame) {
|
|
ADD_MV_REF_LIST(get_sub_block_mv(candidate, check_sub_blocks, 0,
|
|
mv_ref->col, block_idx));
|
|
different_ref_found = candidate->mbmi.ref_frame[1] != ref_frame;
|
|
} else {
|
|
different_ref_found = 1;
|
|
if (candidate->mbmi.ref_frame[1] == ref_frame) {
|
|
// Add second motion vector if it has the same ref_frame.
|
|
ADD_MV_REF_LIST(get_sub_block_mv(candidate, check_sub_blocks, 1,
|
|
mv_ref->col, block_idx));
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check the rest of the neighbors in much the same way
|
|
// as before except we don't need to keep track of sub blocks or
|
|
// mode counts.
|
|
for (; idx < MVREF_NEIGHBOURS; ++idx) {
|
|
const MV *mv_ref = &mv_ref_search[idx];
|
|
if (!is_inside(mi_col, mi_row, cm->cur_tile_mi_col_start,
|
|
cm->cur_tile_mi_col_end, cm->mi_rows, mv_ref))
|
|
continue;
|
|
|
|
candidate = here + mv_ref->col + mv_ref->row * xd->mode_info_stride;
|
|
|
|
if (candidate->mbmi.ref_frame[0] == ref_frame) {
|
|
ADD_MV_REF_LIST(candidate->mbmi.mv[0]);
|
|
different_ref_found = candidate->mbmi.ref_frame[1] != ref_frame;
|
|
} else {
|
|
different_ref_found = 1;
|
|
if (candidate->mbmi.ref_frame[1] == ref_frame) {
|
|
ADD_MV_REF_LIST(candidate->mbmi.mv[1]);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check the last frame's mode and mv info.
|
|
if (lf_here != NULL) {
|
|
if (lf_here->mbmi.ref_frame[0] == ref_frame) {
|
|
ADD_MV_REF_LIST(lf_here->mbmi.mv[0]);
|
|
} else if (lf_here->mbmi.ref_frame[1] == ref_frame) {
|
|
ADD_MV_REF_LIST(lf_here->mbmi.mv[1]);
|
|
}
|
|
}
|
|
|
|
// Since we couldn't find 2 mvs from the same reference frame
|
|
// go back through the neighbors and find motion vectors from
|
|
// different reference frames.
|
|
if (different_ref_found) {
|
|
for (idx = 0; idx < MVREF_NEIGHBOURS; ++idx) {
|
|
const MV *mv_ref = &mv_ref_search[idx];
|
|
if (!is_inside(mi_col, mi_row, cm->cur_tile_mi_col_start,
|
|
cm->cur_tile_mi_col_end, cm->mi_rows, mv_ref))
|
|
continue;
|
|
|
|
candidate = here + mv_ref->col + mv_ref->row * xd->mode_info_stride;
|
|
|
|
// If the candidate is INTRA we don't want to consider its mv.
|
|
if (!is_inter_block(&candidate->mbmi))
|
|
continue;
|
|
|
|
IF_DIFF_REF_FRAME_ADD_MV(&candidate->mbmi);
|
|
}
|
|
}
|
|
|
|
// Since we still don't have a candidate we'll try the last frame.
|
|
if (lf_here != NULL && is_inter_block(&lf_here->mbmi)) {
|
|
IF_DIFF_REF_FRAME_ADD_MV(&lf_here->mbmi);
|
|
}
|
|
|
|
Done:
|
|
|
|
mbmi->mode_context[ref_frame] = counter_to_context[context_counter];
|
|
|
|
// Clamp vectors
|
|
for (idx = 0; idx < MAX_MV_REF_CANDIDATES; ++idx)
|
|
clamp_mv_ref(&mv_ref_list[idx].as_mv, xd);
|
|
}
|