314 lines
13 KiB
C
314 lines
13 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_common.h"
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#include "vp9/common/vp9_pred_common.h"
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#include "vp9/common/vp9_seg_common.h"
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// Returns a context number for the given MB prediction signal
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int vp9_get_pred_context_switchable_interp(const MACROBLOCKD *xd) {
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// Note:
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// The mode info data structure has a one element border above and to the
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// left of the entries corresponding to real macroblocks.
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// The prediction flags in these dummy entries are initialized to 0.
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const MODE_INFO *const left_mi = xd->left_mi;
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const int left_type = left_mi && is_inter_block(left_mi) ?
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left_mi->interp_filter : SWITCHABLE_FILTERS;
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const MODE_INFO *const above_mi = xd->above_mi;
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const int above_type = above_mi && is_inter_block(above_mi) ?
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above_mi->interp_filter : SWITCHABLE_FILTERS;
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if (left_type == above_type)
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return left_type;
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else if (left_type == SWITCHABLE_FILTERS)
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return above_type;
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else if (above_type == SWITCHABLE_FILTERS)
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return left_type;
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else
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return SWITCHABLE_FILTERS;
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}
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int vp9_get_reference_mode_context(const VP9_COMMON *cm,
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const MACROBLOCKD *xd) {
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int ctx;
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const MODE_INFO *const above_mi = xd->above_mi;
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const MODE_INFO *const left_mi = xd->left_mi;
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const int has_above = !!above_mi;
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const int has_left = !!left_mi;
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// Note:
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// The mode info data structure has a one element border above and to the
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// left of the entries corresponding to real macroblocks.
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// The prediction flags in these dummy entries are initialized to 0.
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if (has_above && has_left) { // both edges available
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if (!has_second_ref(above_mi) && !has_second_ref(left_mi))
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// neither edge uses comp pred (0/1)
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ctx = (above_mi->ref_frame[0] == cm->comp_fixed_ref) ^
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(left_mi->ref_frame[0] == cm->comp_fixed_ref);
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else if (!has_second_ref(above_mi))
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// one of two edges uses comp pred (2/3)
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ctx = 2 + (above_mi->ref_frame[0] == cm->comp_fixed_ref ||
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!is_inter_block(above_mi));
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else if (!has_second_ref(left_mi))
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// one of two edges uses comp pred (2/3)
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ctx = 2 + (left_mi->ref_frame[0] == cm->comp_fixed_ref ||
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!is_inter_block(left_mi));
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else // both edges use comp pred (4)
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ctx = 4;
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} else if (has_above || has_left) { // one edge available
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const MODE_INFO *edge_mi = has_above ? above_mi : left_mi;
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if (!has_second_ref(edge_mi))
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// edge does not use comp pred (0/1)
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ctx = edge_mi->ref_frame[0] == cm->comp_fixed_ref;
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else
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// edge uses comp pred (3)
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ctx = 3;
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} else { // no edges available (1)
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ctx = 1;
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}
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assert(ctx >= 0 && ctx < COMP_INTER_CONTEXTS);
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return ctx;
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}
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// Returns a context number for the given MB prediction signal
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int vp9_get_pred_context_comp_ref_p(const VP9_COMMON *cm,
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const MACROBLOCKD *xd) {
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int pred_context;
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const MODE_INFO *const above_mi = xd->above_mi;
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const MODE_INFO *const left_mi = xd->left_mi;
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const int above_in_image = !!above_mi;
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const int left_in_image = !!left_mi;
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// Note:
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// The mode info data structure has a one element border above and to the
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// left of the entries corresponding to real macroblocks.
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// The prediction flags in these dummy entries are initialized to 0.
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const int fix_ref_idx = cm->ref_frame_sign_bias[cm->comp_fixed_ref];
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const int var_ref_idx = !fix_ref_idx;
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if (above_in_image && left_in_image) { // both edges available
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const int above_intra = !is_inter_block(above_mi);
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const int left_intra = !is_inter_block(left_mi);
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if (above_intra && left_intra) { // intra/intra (2)
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pred_context = 2;
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} else if (above_intra || left_intra) { // intra/inter
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const MODE_INFO *edge_mi = above_intra ? left_mi : above_mi;
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if (!has_second_ref(edge_mi)) // single pred (1/3)
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pred_context = 1 + 2 * (edge_mi->ref_frame[0] != cm->comp_var_ref[1]);
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else // comp pred (1/3)
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pred_context = 1 + 2 * (edge_mi->ref_frame[var_ref_idx]
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!= cm->comp_var_ref[1]);
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} else { // inter/inter
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const int l_sg = !has_second_ref(left_mi);
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const int a_sg = !has_second_ref(above_mi);
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const MV_REFERENCE_FRAME vrfa = a_sg ? above_mi->ref_frame[0]
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: above_mi->ref_frame[var_ref_idx];
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const MV_REFERENCE_FRAME vrfl = l_sg ? left_mi->ref_frame[0]
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: left_mi->ref_frame[var_ref_idx];
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if (vrfa == vrfl && cm->comp_var_ref[1] == vrfa) {
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pred_context = 0;
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} else if (l_sg && a_sg) { // single/single
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if ((vrfa == cm->comp_fixed_ref && vrfl == cm->comp_var_ref[0]) ||
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(vrfl == cm->comp_fixed_ref && vrfa == cm->comp_var_ref[0]))
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pred_context = 4;
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else if (vrfa == vrfl)
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pred_context = 3;
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else
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pred_context = 1;
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} else if (l_sg || a_sg) { // single/comp
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const MV_REFERENCE_FRAME vrfc = l_sg ? vrfa : vrfl;
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const MV_REFERENCE_FRAME rfs = a_sg ? vrfa : vrfl;
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if (vrfc == cm->comp_var_ref[1] && rfs != cm->comp_var_ref[1])
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pred_context = 1;
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else if (rfs == cm->comp_var_ref[1] && vrfc != cm->comp_var_ref[1])
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pred_context = 2;
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else
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pred_context = 4;
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} else if (vrfa == vrfl) { // comp/comp
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pred_context = 4;
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} else {
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pred_context = 2;
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}
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}
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} else if (above_in_image || left_in_image) { // one edge available
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const MODE_INFO *edge_mi = above_in_image ? above_mi : left_mi;
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if (!is_inter_block(edge_mi)) {
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pred_context = 2;
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} else {
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if (has_second_ref(edge_mi))
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pred_context = 4 * (edge_mi->ref_frame[var_ref_idx]
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!= cm->comp_var_ref[1]);
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else
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pred_context = 3 * (edge_mi->ref_frame[0] != cm->comp_var_ref[1]);
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}
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} else { // no edges available (2)
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pred_context = 2;
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}
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assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
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return pred_context;
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}
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int vp9_get_pred_context_single_ref_p1(const MACROBLOCKD *xd) {
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int pred_context;
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const MODE_INFO *const above_mi = xd->above_mi;
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const MODE_INFO *const left_mi = xd->left_mi;
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const int has_above = !!above_mi;
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const int has_left = !!left_mi;
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// Note:
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// The mode info data structure has a one element border above and to the
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// left of the entries corresponding to real macroblocks.
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// The prediction flags in these dummy entries are initialized to 0.
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if (has_above && has_left) { // both edges available
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const int above_intra = !is_inter_block(above_mi);
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const int left_intra = !is_inter_block(left_mi);
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if (above_intra && left_intra) { // intra/intra
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pred_context = 2;
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} else if (above_intra || left_intra) { // intra/inter or inter/intra
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const MODE_INFO *edge_mi = above_intra ? left_mi : above_mi;
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if (!has_second_ref(edge_mi))
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pred_context = 4 * (edge_mi->ref_frame[0] == LAST_FRAME);
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else
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pred_context = 1 + (edge_mi->ref_frame[0] == LAST_FRAME ||
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edge_mi->ref_frame[1] == LAST_FRAME);
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} else { // inter/inter
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const int above_has_second = has_second_ref(above_mi);
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const int left_has_second = has_second_ref(left_mi);
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const MV_REFERENCE_FRAME above0 = above_mi->ref_frame[0];
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const MV_REFERENCE_FRAME above1 = above_mi->ref_frame[1];
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const MV_REFERENCE_FRAME left0 = left_mi->ref_frame[0];
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const MV_REFERENCE_FRAME left1 = left_mi->ref_frame[1];
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if (above_has_second && left_has_second) {
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pred_context = 1 + (above0 == LAST_FRAME || above1 == LAST_FRAME ||
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left0 == LAST_FRAME || left1 == LAST_FRAME);
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} else if (above_has_second || left_has_second) {
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const MV_REFERENCE_FRAME rfs = !above_has_second ? above0 : left0;
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const MV_REFERENCE_FRAME crf1 = above_has_second ? above0 : left0;
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const MV_REFERENCE_FRAME crf2 = above_has_second ? above1 : left1;
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if (rfs == LAST_FRAME)
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pred_context = 3 + (crf1 == LAST_FRAME || crf2 == LAST_FRAME);
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else
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pred_context = (crf1 == LAST_FRAME || crf2 == LAST_FRAME);
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} else {
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pred_context = 2 * (above0 == LAST_FRAME) + 2 * (left0 == LAST_FRAME);
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}
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}
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} else if (has_above || has_left) { // one edge available
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const MODE_INFO *edge_mi = has_above ? above_mi : left_mi;
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if (!is_inter_block(edge_mi)) { // intra
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pred_context = 2;
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} else { // inter
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if (!has_second_ref(edge_mi))
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pred_context = 4 * (edge_mi->ref_frame[0] == LAST_FRAME);
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else
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pred_context = 1 + (edge_mi->ref_frame[0] == LAST_FRAME ||
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edge_mi->ref_frame[1] == LAST_FRAME);
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}
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} else { // no edges available
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pred_context = 2;
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}
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assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
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return pred_context;
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}
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int vp9_get_pred_context_single_ref_p2(const MACROBLOCKD *xd) {
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int pred_context;
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const MODE_INFO *const above_mi = xd->above_mi;
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const MODE_INFO *const left_mi = xd->left_mi;
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const int has_above = !!above_mi;
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const int has_left = !!left_mi;
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// Note:
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// The mode info data structure has a one element border above and to the
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// left of the entries corresponding to real macroblocks.
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// The prediction flags in these dummy entries are initialized to 0.
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if (has_above && has_left) { // both edges available
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const int above_intra = !is_inter_block(above_mi);
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const int left_intra = !is_inter_block(left_mi);
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if (above_intra && left_intra) { // intra/intra
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pred_context = 2;
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} else if (above_intra || left_intra) { // intra/inter or inter/intra
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const MODE_INFO *edge_mi = above_intra ? left_mi : above_mi;
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if (!has_second_ref(edge_mi)) {
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if (edge_mi->ref_frame[0] == LAST_FRAME)
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pred_context = 3;
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else
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pred_context = 4 * (edge_mi->ref_frame[0] == GOLDEN_FRAME);
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} else {
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pred_context = 1 + 2 * (edge_mi->ref_frame[0] == GOLDEN_FRAME ||
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edge_mi->ref_frame[1] == GOLDEN_FRAME);
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}
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} else { // inter/inter
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const int above_has_second = has_second_ref(above_mi);
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const int left_has_second = has_second_ref(left_mi);
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const MV_REFERENCE_FRAME above0 = above_mi->ref_frame[0];
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const MV_REFERENCE_FRAME above1 = above_mi->ref_frame[1];
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const MV_REFERENCE_FRAME left0 = left_mi->ref_frame[0];
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const MV_REFERENCE_FRAME left1 = left_mi->ref_frame[1];
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if (above_has_second && left_has_second) {
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if (above0 == left0 && above1 == left1)
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pred_context = 3 * (above0 == GOLDEN_FRAME ||
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above1 == GOLDEN_FRAME ||
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left0 == GOLDEN_FRAME ||
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left1 == GOLDEN_FRAME);
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else
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pred_context = 2;
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} else if (above_has_second || left_has_second) {
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const MV_REFERENCE_FRAME rfs = !above_has_second ? above0 : left0;
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const MV_REFERENCE_FRAME crf1 = above_has_second ? above0 : left0;
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const MV_REFERENCE_FRAME crf2 = above_has_second ? above1 : left1;
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if (rfs == GOLDEN_FRAME)
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pred_context = 3 + (crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME);
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else if (rfs == ALTREF_FRAME)
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pred_context = crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME;
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else
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pred_context = 1 + 2 * (crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME);
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} else {
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if (above0 == LAST_FRAME && left0 == LAST_FRAME) {
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pred_context = 3;
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} else if (above0 == LAST_FRAME || left0 == LAST_FRAME) {
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const MV_REFERENCE_FRAME edge0 = (above0 == LAST_FRAME) ? left0
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: above0;
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pred_context = 4 * (edge0 == GOLDEN_FRAME);
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} else {
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pred_context = 2 * (above0 == GOLDEN_FRAME) +
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2 * (left0 == GOLDEN_FRAME);
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}
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}
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}
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} else if (has_above || has_left) { // one edge available
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const MODE_INFO *edge_mi = has_above ? above_mi : left_mi;
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if (!is_inter_block(edge_mi) ||
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(edge_mi->ref_frame[0] == LAST_FRAME && !has_second_ref(edge_mi)))
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pred_context = 2;
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else if (!has_second_ref(edge_mi))
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pred_context = 4 * (edge_mi->ref_frame[0] == GOLDEN_FRAME);
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else
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pred_context = 3 * (edge_mi->ref_frame[0] == GOLDEN_FRAME ||
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edge_mi->ref_frame[1] == GOLDEN_FRAME);
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} else { // no edges available (2)
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pred_context = 2;
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}
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assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
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return pred_context;
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}
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