285 lines
10 KiB
C
285 lines
10 KiB
C
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/*
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* Copyright (c) 2012 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "vp9/common/vp9_mvref_common.h"
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#define MVREF_NEIGHBOURS 8
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typedef enum {
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BOTH_ZERO = 0,
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ZERO_PLUS_PREDICTED = 1,
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BOTH_PREDICTED = 2,
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NEW_PLUS_NON_INTRA = 3,
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BOTH_NEW = 4,
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INTRA_PLUS_NON_INTRA = 5,
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BOTH_INTRA = 6,
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INVALID_CASE = 9
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} motion_vector_context;
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// This is used to figure out a context for the ref blocks. The code flattens
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// an array that would have 3 possible counts (0, 1 & 2) for 3 choices by
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// adding 9 for each intra block, 3 for each zero mv and 1 for each new
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// motion vector. This single number is then converted into a context
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// with a single lookup ( counter_to_context ).
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static const int mode_2_counter[MB_MODE_COUNT] = {
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9, // DC_PRED
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9, // V_PRED
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9, // H_PRED
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9, // D45_PRED
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9, // D135_PRED
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9, // D117_PRED
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9, // D153_PRED
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9, // D207_PRED
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9, // D63_PRED
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9, // TM_PRED
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0, // NEARESTMV
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0, // NEARMV
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3, // ZEROMV
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1, // NEWMV
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};
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// There are 3^3 different combinations of 3 counts that can be either 0,1 or
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// 2. However the actual count can never be greater than 2 so the highest
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// counter we need is 18. 9 is an invalid counter that's never used.
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static const int counter_to_context[19] = {
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BOTH_PREDICTED, // 0
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NEW_PLUS_NON_INTRA, // 1
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BOTH_NEW, // 2
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ZERO_PLUS_PREDICTED, // 3
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NEW_PLUS_NON_INTRA, // 4
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INVALID_CASE, // 5
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BOTH_ZERO, // 6
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INVALID_CASE, // 7
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INVALID_CASE, // 8
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INTRA_PLUS_NON_INTRA, // 9
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INTRA_PLUS_NON_INTRA, // 10
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INVALID_CASE, // 11
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INTRA_PLUS_NON_INTRA, // 12
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INVALID_CASE, // 13
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INVALID_CASE, // 14
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INVALID_CASE, // 15
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INVALID_CASE, // 16
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INVALID_CASE, // 17
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BOTH_INTRA // 18
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};
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static const MV mv_ref_blocks[BLOCK_SIZES][MVREF_NEIGHBOURS] = {
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// 4X4
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{{-1, 0}, {0, -1}, {-1, -1}, {-2, 0}, {0, -2}, {-2, -1}, {-1, -2}, {-2, -2}},
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// 4X8
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{{-1, 0}, {0, -1}, {-1, -1}, {-2, 0}, {0, -2}, {-2, -1}, {-1, -2}, {-2, -2}},
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// 8X4
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{{-1, 0}, {0, -1}, {-1, -1}, {-2, 0}, {0, -2}, {-2, -1}, {-1, -2}, {-2, -2}},
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// 8X8
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{{-1, 0}, {0, -1}, {-1, -1}, {-2, 0}, {0, -2}, {-2, -1}, {-1, -2}, {-2, -2}},
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// 8X16
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{{0, -1}, {-1, 0}, {1, -1}, {-1, -1}, {0, -2}, {-2, 0}, {-2, -1}, {-1, -2}},
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// 16X8
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{{-1, 0}, {0, -1}, {-1, 1}, {-1, -1}, {-2, 0}, {0, -2}, {-1, -2}, {-2, -1}},
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// 16X16
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{{-1, 0}, {0, -1}, {-1, 1}, {1, -1}, {-1, -1}, {-3, 0}, {0, -3}, {-3, -3}},
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// 16X32
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{{0, -1}, {-1, 0}, {2, -1}, {-1, -1}, {-1, 1}, {0, -3}, {-3, 0}, {-3, -3}},
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// 32X16
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{{-1, 0}, {0, -1}, {-1, 2}, {-1, -1}, {1, -1}, {-3, 0}, {0, -3}, {-3, -3}},
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// 32X32
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{{-1, 1}, {1, -1}, {-1, 2}, {2, -1}, {-1, -1}, {-3, 0}, {0, -3}, {-3, -3}},
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// 32X64
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{{0, -1}, {-1, 0}, {4, -1}, {-1, 2}, {-1, -1}, {0, -3}, {-3, 0}, {2, -1}},
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// 64X32
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{{-1, 0}, {0, -1}, {-1, 4}, {2, -1}, {-1, -1}, {-3, 0}, {0, -3}, {-1, 2}},
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// 64X64
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{{-1, 3}, {3, -1}, {-1, 4}, {4, -1}, {-1, -1}, {-1, 0}, {0, -1}, {-1, 6}}
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};
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static const int idx_n_column_to_subblock[4][2] = {
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{1, 2},
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{1, 3},
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{3, 2},
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{3, 3}
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};
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// clamp_mv_ref
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#define MV_BORDER (16 << 3) // Allow 16 pels in 1/8th pel units
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static void clamp_mv_ref(MV *mv, const MACROBLOCKD *xd) {
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clamp_mv(mv, xd->mb_to_left_edge - MV_BORDER,
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xd->mb_to_right_edge + MV_BORDER,
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xd->mb_to_top_edge - MV_BORDER,
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xd->mb_to_bottom_edge + MV_BORDER);
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}
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// This function returns either the appropriate sub block or block's mv
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// on whether the block_size < 8x8 and we have check_sub_blocks set.
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static INLINE int_mv get_sub_block_mv(const MODE_INFO *candidate, int which_mv,
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int search_col, int block_idx) {
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return block_idx >= 0 && candidate->mbmi.sb_type < BLOCK_8X8
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? candidate->bmi[idx_n_column_to_subblock[block_idx][search_col == 0]]
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.as_mv[which_mv]
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: candidate->mbmi.mv[which_mv];
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}
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// Performs mv sign inversion if indicated by the reference frame combination.
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static INLINE int_mv scale_mv(const MB_MODE_INFO *mbmi, int ref,
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const MV_REFERENCE_FRAME this_ref_frame,
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const int *ref_sign_bias) {
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int_mv mv = mbmi->mv[ref];
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if (ref_sign_bias[mbmi->ref_frame[ref]] != ref_sign_bias[this_ref_frame]) {
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mv.as_mv.row *= -1;
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mv.as_mv.col *= -1;
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}
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return mv;
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}
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// This macro is used to add a motion vector mv_ref list if it isn't
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// already in the list. If it's the second motion vector it will also
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// skip all additional processing and jump to done!
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#define ADD_MV_REF_LIST(MV) \
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do { \
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if (refmv_count) { \
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if ((MV).as_int != mv_ref_list[0].as_int) { \
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mv_ref_list[refmv_count] = (MV); \
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goto Done; \
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} \
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} else { \
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mv_ref_list[refmv_count++] = (MV); \
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} \
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} while (0)
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// If either reference frame is different, not INTRA, and they
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// are different from each other scale and add the mv to our list.
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#define IF_DIFF_REF_FRAME_ADD_MV(CANDIDATE) \
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do { \
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if ((CANDIDATE)->ref_frame[0] != ref_frame) \
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ADD_MV_REF_LIST(scale_mv((CANDIDATE), 0, ref_frame, ref_sign_bias)); \
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if ((CANDIDATE)->ref_frame[1] != ref_frame && \
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has_second_ref(CANDIDATE) && \
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(CANDIDATE)->mv[1].as_int != (CANDIDATE)->mv[0].as_int) \
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ADD_MV_REF_LIST(scale_mv((CANDIDATE), 1, ref_frame, ref_sign_bias)); \
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} while (0)
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// Checks that the given mi_row, mi_col and search point
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// are inside the borders of the tile.
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static INLINE int is_inside(const VP9_COMMON *cm, int mi_col, int mi_row,
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const MV *mv) {
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return !(mi_row + mv->row < 0 ||
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mi_col + mv->col < cm->cur_tile_mi_col_start ||
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mi_row + mv->row >= cm->mi_rows ||
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mi_col + mv->col >= cm->cur_tile_mi_col_end);
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}
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// This function searches the neighbourhood of a given MB/SB
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// to try and find candidate reference vectors.
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void vp9_find_mv_refs_idx(const VP9_COMMON *cm, const MACROBLOCKD *xd,
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MODE_INFO *mi, const MODE_INFO *prev_mi,
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MV_REFERENCE_FRAME ref_frame,
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int_mv *mv_ref_list,
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int block_idx,
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int mi_row, int mi_col) {
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const int *ref_sign_bias = cm->ref_frame_sign_bias;
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int i, refmv_count = 0;
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const MV *const mv_ref_search = mv_ref_blocks[mi->mbmi.sb_type];
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const MB_MODE_INFO *const prev_mbmi = prev_mi ? &prev_mi->mbmi : NULL;
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int different_ref_found = 0;
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int context_counter = 0;
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// Blank the reference vector list
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vpx_memset(mv_ref_list, 0, sizeof(*mv_ref_list) * MAX_MV_REF_CANDIDATES);
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// The nearest 2 blocks are treated differently
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// if the size < 8x8 we get the mv from the bmi substructure,
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// and we also need to keep a mode count.
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for (i = 0; i < 2; ++i) {
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const MV *const mv_ref = &mv_ref_search[i];
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if (is_inside(cm, mi_col, mi_row, mv_ref)) {
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const MODE_INFO *const candidate_mi = xd->mi_8x8[mv_ref->col + mv_ref->row
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* xd->mode_info_stride];
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const MB_MODE_INFO *const candidate = &candidate_mi->mbmi;
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// Keep counts for entropy encoding.
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context_counter += mode_2_counter[candidate->mode];
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// Check if the candidate comes from the same reference frame.
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if (candidate->ref_frame[0] == ref_frame) {
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ADD_MV_REF_LIST(get_sub_block_mv(candidate_mi, 0,
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mv_ref->col, block_idx));
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different_ref_found = candidate->ref_frame[1] != ref_frame;
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} else {
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if (candidate->ref_frame[1] == ref_frame)
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// Add second motion vector if it has the same ref_frame.
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ADD_MV_REF_LIST(get_sub_block_mv(candidate_mi, 1,
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mv_ref->col, block_idx));
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different_ref_found = 1;
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}
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}
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}
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// Check the rest of the neighbors in much the same way
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// as before except we don't need to keep track of sub blocks or
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// mode counts.
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for (; i < MVREF_NEIGHBOURS; ++i) {
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const MV *const mv_ref = &mv_ref_search[i];
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if (is_inside(cm, mi_col, mi_row, mv_ref)) {
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const MB_MODE_INFO *const candidate = &xd->mi_8x8[mv_ref->col +
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mv_ref->row
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* xd->mode_info_stride]->mbmi;
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if (candidate->ref_frame[0] == ref_frame) {
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ADD_MV_REF_LIST(candidate->mv[0]);
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different_ref_found = candidate->ref_frame[1] != ref_frame;
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} else {
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if (candidate->ref_frame[1] == ref_frame)
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ADD_MV_REF_LIST(candidate->mv[1]);
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different_ref_found = 1;
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}
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}
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}
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// Check the last frame's mode and mv info.
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if (prev_mbmi) {
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if (prev_mbmi->ref_frame[0] == ref_frame)
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ADD_MV_REF_LIST(prev_mbmi->mv[0]);
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else if (prev_mbmi->ref_frame[1] == ref_frame)
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ADD_MV_REF_LIST(prev_mbmi->mv[1]);
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}
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// Since we couldn't find 2 mvs from the same reference frame
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// go back through the neighbors and find motion vectors from
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// different reference frames.
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if (different_ref_found) {
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for (i = 0; i < MVREF_NEIGHBOURS; ++i) {
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const MV *mv_ref = &mv_ref_search[i];
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if (is_inside(cm, mi_col, mi_row, mv_ref)) {
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const MB_MODE_INFO *const candidate = &xd->mi_8x8[mv_ref->col +
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mv_ref->row
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* xd->mode_info_stride]->mbmi;
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// If the candidate is INTRA we don't want to consider its mv.
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if (is_inter_block(candidate))
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IF_DIFF_REF_FRAME_ADD_MV(candidate);
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}
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}
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}
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// Since we still don't have a candidate we'll try the last frame.
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if (prev_mbmi && is_inter_block(prev_mbmi))
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IF_DIFF_REF_FRAME_ADD_MV(prev_mbmi);
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Done:
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mi->mbmi.mode_context[ref_frame] = counter_to_context[context_counter];
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// Clamp vectors
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for (i = 0; i < MAX_MV_REF_CANDIDATES; ++i)
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clamp_mv_ref(&mv_ref_list[i].as_mv, xd);
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}
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