200 lines
7.3 KiB
C
200 lines
7.3 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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// This function searches the neighborhood of a given MB/SB
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// to try and find candidate reference vectors.
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static void find_mv_refs_idx(const VP9_COMMON *cm, const MACROBLOCKD *xd,
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MODE_INFO *mi, MV_REFERENCE_FRAME ref_frame,
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int_mv *mv_ref_list, int block, int mi_row,
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int mi_col, uint8_t *mode_context) {
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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 POSITION *const mv_ref_search = mv_ref_blocks[mi->sb_type];
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int different_ref_found = 0;
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int context_counter = 0;
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const MV_REF *const prev_frame_mvs =
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cm->use_prev_frame_mvs
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? cm->prev_frame->mvs + mi_row * cm->mi_cols + mi_col
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: NULL;
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const TileInfo *const tile = &xd->tile;
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// Blank the reference vector list
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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 POSITION *const mv_ref = &mv_ref_search[i];
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if (is_inside(tile, mi_col, mi_row, cm->mi_rows, mv_ref)) {
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const MODE_INFO *const candidate_mi =
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xd->mi[mv_ref->col + mv_ref->row * xd->mi_stride];
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// Keep counts for entropy encoding.
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context_counter += mode_2_counter[candidate_mi->mode];
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different_ref_found = 1;
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if (candidate_mi->ref_frame[0] == ref_frame)
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ADD_MV_REF_LIST(get_sub_block_mv(candidate_mi, 0, mv_ref->col, block),
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refmv_count, mv_ref_list, Done);
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else if (candidate_mi->ref_frame[1] == ref_frame)
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ADD_MV_REF_LIST(get_sub_block_mv(candidate_mi, 1, mv_ref->col, block),
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refmv_count, mv_ref_list, Done);
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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 POSITION *const mv_ref = &mv_ref_search[i];
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if (is_inside(tile, mi_col, mi_row, cm->mi_rows, mv_ref)) {
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const MODE_INFO *const candidate_mi =
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xd->mi[mv_ref->col + mv_ref->row * xd->mi_stride];
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different_ref_found = 1;
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if (candidate_mi->ref_frame[0] == ref_frame)
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ADD_MV_REF_LIST(candidate_mi->mv[0], refmv_count, mv_ref_list, Done);
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else if (candidate_mi->ref_frame[1] == ref_frame)
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ADD_MV_REF_LIST(candidate_mi->mv[1], refmv_count, mv_ref_list, Done);
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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 (cm->use_prev_frame_mvs) {
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if (prev_frame_mvs->ref_frame[0] == ref_frame) {
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ADD_MV_REF_LIST(prev_frame_mvs->mv[0], refmv_count, mv_ref_list, Done);
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} else if (prev_frame_mvs->ref_frame[1] == ref_frame) {
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ADD_MV_REF_LIST(prev_frame_mvs->mv[1], refmv_count, mv_ref_list, Done);
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}
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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 POSITION *mv_ref = &mv_ref_search[i];
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if (is_inside(tile, mi_col, mi_row, cm->mi_rows, mv_ref)) {
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const MODE_INFO *const candidate_mi =
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xd->mi[mv_ref->col + mv_ref->row * xd->mi_stride];
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// If the candidate is INTRA we don't want to consider its mv.
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IF_DIFF_REF_FRAME_ADD_MV(candidate_mi, ref_frame, ref_sign_bias,
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refmv_count, mv_ref_list, Done);
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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 (cm->use_prev_frame_mvs) {
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if (prev_frame_mvs->ref_frame[0] != ref_frame &&
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prev_frame_mvs->ref_frame[0] > INTRA_FRAME) {
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int_mv mv = prev_frame_mvs->mv[0];
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if (ref_sign_bias[prev_frame_mvs->ref_frame[0]] !=
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ref_sign_bias[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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ADD_MV_REF_LIST(mv, refmv_count, mv_ref_list, Done);
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}
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if (prev_frame_mvs->ref_frame[1] > INTRA_FRAME &&
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prev_frame_mvs->ref_frame[1] != ref_frame &&
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prev_frame_mvs->mv[1].as_int != prev_frame_mvs->mv[0].as_int) {
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int_mv mv = prev_frame_mvs->mv[1];
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if (ref_sign_bias[prev_frame_mvs->ref_frame[1]] !=
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ref_sign_bias[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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ADD_MV_REF_LIST(mv, refmv_count, mv_ref_list, Done);
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}
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}
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Done:
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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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void vp9_find_mv_refs(const VP9_COMMON *cm, const MACROBLOCKD *xd,
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MODE_INFO *mi, MV_REFERENCE_FRAME ref_frame,
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int_mv *mv_ref_list, int mi_row, int mi_col,
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uint8_t *mode_context) {
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find_mv_refs_idx(cm, xd, mi, ref_frame, mv_ref_list, -1, mi_row, mi_col,
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mode_context);
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}
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void vp9_find_best_ref_mvs(MACROBLOCKD *xd, int allow_hp, int_mv *mvlist,
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int_mv *nearest_mv, int_mv *near_mv) {
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int i;
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// Make sure all the candidates are properly clamped etc
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for (i = 0; i < MAX_MV_REF_CANDIDATES; ++i) {
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lower_mv_precision(&mvlist[i].as_mv, allow_hp);
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clamp_mv2(&mvlist[i].as_mv, xd);
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}
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*nearest_mv = mvlist[0];
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*near_mv = mvlist[1];
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}
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void vp9_append_sub8x8_mvs_for_idx(VP9_COMMON *cm, MACROBLOCKD *xd, int block,
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int ref, int mi_row, int mi_col,
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int_mv *nearest_mv, int_mv *near_mv,
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uint8_t *mode_context) {
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int_mv mv_list[MAX_MV_REF_CANDIDATES];
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MODE_INFO *const mi = xd->mi[0];
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b_mode_info *bmi = mi->bmi;
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int n;
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assert(MAX_MV_REF_CANDIDATES == 2);
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find_mv_refs_idx(cm, xd, mi, mi->ref_frame[ref], mv_list, block, mi_row,
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mi_col, mode_context);
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near_mv->as_int = 0;
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switch (block) {
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case 0:
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nearest_mv->as_int = mv_list[0].as_int;
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near_mv->as_int = mv_list[1].as_int;
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break;
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case 1:
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case 2:
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nearest_mv->as_int = bmi[0].as_mv[ref].as_int;
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for (n = 0; n < MAX_MV_REF_CANDIDATES; ++n)
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if (nearest_mv->as_int != mv_list[n].as_int) {
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near_mv->as_int = mv_list[n].as_int;
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break;
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}
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break;
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case 3: {
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int_mv candidates[2 + MAX_MV_REF_CANDIDATES];
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candidates[0] = bmi[1].as_mv[ref];
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candidates[1] = bmi[0].as_mv[ref];
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candidates[2] = mv_list[0];
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candidates[3] = mv_list[1];
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nearest_mv->as_int = bmi[2].as_mv[ref].as_int;
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for (n = 0; n < 2 + MAX_MV_REF_CANDIDATES; ++n)
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if (nearest_mv->as_int != candidates[n].as_int) {
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near_mv->as_int = candidates[n].as_int;
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break;
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}
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break;
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}
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default: assert(0 && "Invalid block index.");
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}
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}
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