Line data Source code
1 :
2 : /*
3 : * Copyright (c) 2012 The WebM project authors. All Rights Reserved.
4 : *
5 : * Use of this source code is governed by a BSD-style license
6 : * that can be found in the LICENSE file in the root of the source
7 : * tree. An additional intellectual property rights grant can be found
8 : * in the file PATENTS. All contributing project authors may
9 : * be found in the AUTHORS file in the root of the source tree.
10 : */
11 :
12 : #include "vp9/common/vp9_common.h"
13 : #include "vp9/common/vp9_pred_common.h"
14 : #include "vp9/common/vp9_seg_common.h"
15 :
16 0 : int vp9_get_reference_mode_context(const VP9_COMMON *cm,
17 : const MACROBLOCKD *xd) {
18 : int ctx;
19 0 : const MODE_INFO *const above_mi = xd->above_mi;
20 0 : const MODE_INFO *const left_mi = xd->left_mi;
21 0 : const int has_above = !!above_mi;
22 0 : const int has_left = !!left_mi;
23 : // Note:
24 : // The mode info data structure has a one element border above and to the
25 : // left of the entries corresponding to real macroblocks.
26 : // The prediction flags in these dummy entries are initialized to 0.
27 0 : if (has_above && has_left) { // both edges available
28 0 : if (!has_second_ref(above_mi) && !has_second_ref(left_mi))
29 : // neither edge uses comp pred (0/1)
30 0 : ctx = (above_mi->ref_frame[0] == cm->comp_fixed_ref) ^
31 0 : (left_mi->ref_frame[0] == cm->comp_fixed_ref);
32 0 : else if (!has_second_ref(above_mi))
33 : // one of two edges uses comp pred (2/3)
34 0 : ctx = 2 + (above_mi->ref_frame[0] == cm->comp_fixed_ref ||
35 0 : !is_inter_block(above_mi));
36 0 : else if (!has_second_ref(left_mi))
37 : // one of two edges uses comp pred (2/3)
38 0 : ctx = 2 + (left_mi->ref_frame[0] == cm->comp_fixed_ref ||
39 0 : !is_inter_block(left_mi));
40 : else // both edges use comp pred (4)
41 0 : ctx = 4;
42 0 : } else if (has_above || has_left) { // one edge available
43 0 : const MODE_INFO *edge_mi = has_above ? above_mi : left_mi;
44 :
45 0 : if (!has_second_ref(edge_mi))
46 : // edge does not use comp pred (0/1)
47 0 : ctx = edge_mi->ref_frame[0] == cm->comp_fixed_ref;
48 : else
49 : // edge uses comp pred (3)
50 0 : ctx = 3;
51 : } else { // no edges available (1)
52 0 : ctx = 1;
53 : }
54 0 : assert(ctx >= 0 && ctx < COMP_INTER_CONTEXTS);
55 0 : return ctx;
56 : }
57 :
58 : // Returns a context number for the given MB prediction signal
59 0 : int vp9_get_pred_context_comp_ref_p(const VP9_COMMON *cm,
60 : const MACROBLOCKD *xd) {
61 : int pred_context;
62 0 : const MODE_INFO *const above_mi = xd->above_mi;
63 0 : const MODE_INFO *const left_mi = xd->left_mi;
64 0 : const int above_in_image = !!above_mi;
65 0 : const int left_in_image = !!left_mi;
66 :
67 : // Note:
68 : // The mode info data structure has a one element border above and to the
69 : // left of the entries corresponding to real macroblocks.
70 : // The prediction flags in these dummy entries are initialized to 0.
71 0 : const int fix_ref_idx = cm->ref_frame_sign_bias[cm->comp_fixed_ref];
72 0 : const int var_ref_idx = !fix_ref_idx;
73 :
74 0 : if (above_in_image && left_in_image) { // both edges available
75 0 : const int above_intra = !is_inter_block(above_mi);
76 0 : const int left_intra = !is_inter_block(left_mi);
77 :
78 0 : if (above_intra && left_intra) { // intra/intra (2)
79 0 : pred_context = 2;
80 0 : } else if (above_intra || left_intra) { // intra/inter
81 0 : const MODE_INFO *edge_mi = above_intra ? left_mi : above_mi;
82 :
83 0 : if (!has_second_ref(edge_mi)) // single pred (1/3)
84 0 : pred_context = 1 + 2 * (edge_mi->ref_frame[0] != cm->comp_var_ref[1]);
85 : else // comp pred (1/3)
86 0 : pred_context =
87 0 : 1 + 2 * (edge_mi->ref_frame[var_ref_idx] != cm->comp_var_ref[1]);
88 : } else { // inter/inter
89 0 : const int l_sg = !has_second_ref(left_mi);
90 0 : const int a_sg = !has_second_ref(above_mi);
91 0 : const MV_REFERENCE_FRAME vrfa =
92 : a_sg ? above_mi->ref_frame[0] : above_mi->ref_frame[var_ref_idx];
93 0 : const MV_REFERENCE_FRAME vrfl =
94 : l_sg ? left_mi->ref_frame[0] : left_mi->ref_frame[var_ref_idx];
95 :
96 0 : if (vrfa == vrfl && cm->comp_var_ref[1] == vrfa) {
97 0 : pred_context = 0;
98 0 : } else if (l_sg && a_sg) { // single/single
99 0 : if ((vrfa == cm->comp_fixed_ref && vrfl == cm->comp_var_ref[0]) ||
100 0 : (vrfl == cm->comp_fixed_ref && vrfa == cm->comp_var_ref[0]))
101 0 : pred_context = 4;
102 0 : else if (vrfa == vrfl)
103 0 : pred_context = 3;
104 : else
105 0 : pred_context = 1;
106 0 : } else if (l_sg || a_sg) { // single/comp
107 0 : const MV_REFERENCE_FRAME vrfc = l_sg ? vrfa : vrfl;
108 0 : const MV_REFERENCE_FRAME rfs = a_sg ? vrfa : vrfl;
109 0 : if (vrfc == cm->comp_var_ref[1] && rfs != cm->comp_var_ref[1])
110 0 : pred_context = 1;
111 0 : else if (rfs == cm->comp_var_ref[1] && vrfc != cm->comp_var_ref[1])
112 0 : pred_context = 2;
113 : else
114 0 : pred_context = 4;
115 0 : } else if (vrfa == vrfl) { // comp/comp
116 0 : pred_context = 4;
117 : } else {
118 0 : pred_context = 2;
119 : }
120 : }
121 0 : } else if (above_in_image || left_in_image) { // one edge available
122 0 : const MODE_INFO *edge_mi = above_in_image ? above_mi : left_mi;
123 :
124 0 : if (!is_inter_block(edge_mi)) {
125 0 : pred_context = 2;
126 : } else {
127 0 : if (has_second_ref(edge_mi))
128 0 : pred_context =
129 0 : 4 * (edge_mi->ref_frame[var_ref_idx] != cm->comp_var_ref[1]);
130 : else
131 0 : pred_context = 3 * (edge_mi->ref_frame[0] != cm->comp_var_ref[1]);
132 : }
133 : } else { // no edges available (2)
134 0 : pred_context = 2;
135 : }
136 0 : assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
137 :
138 0 : return pred_context;
139 : }
140 :
141 0 : int vp9_get_pred_context_single_ref_p1(const MACROBLOCKD *xd) {
142 : int pred_context;
143 0 : const MODE_INFO *const above_mi = xd->above_mi;
144 0 : const MODE_INFO *const left_mi = xd->left_mi;
145 0 : const int has_above = !!above_mi;
146 0 : const int has_left = !!left_mi;
147 : // Note:
148 : // The mode info data structure has a one element border above and to the
149 : // left of the entries corresponding to real macroblocks.
150 : // The prediction flags in these dummy entries are initialized to 0.
151 0 : if (has_above && has_left) { // both edges available
152 0 : const int above_intra = !is_inter_block(above_mi);
153 0 : const int left_intra = !is_inter_block(left_mi);
154 :
155 0 : if (above_intra && left_intra) { // intra/intra
156 0 : pred_context = 2;
157 0 : } else if (above_intra || left_intra) { // intra/inter or inter/intra
158 0 : const MODE_INFO *edge_mi = above_intra ? left_mi : above_mi;
159 0 : if (!has_second_ref(edge_mi))
160 0 : pred_context = 4 * (edge_mi->ref_frame[0] == LAST_FRAME);
161 : else
162 0 : pred_context = 1 + (edge_mi->ref_frame[0] == LAST_FRAME ||
163 0 : edge_mi->ref_frame[1] == LAST_FRAME);
164 : } else { // inter/inter
165 0 : const int above_has_second = has_second_ref(above_mi);
166 0 : const int left_has_second = has_second_ref(left_mi);
167 0 : const MV_REFERENCE_FRAME above0 = above_mi->ref_frame[0];
168 0 : const MV_REFERENCE_FRAME above1 = above_mi->ref_frame[1];
169 0 : const MV_REFERENCE_FRAME left0 = left_mi->ref_frame[0];
170 0 : const MV_REFERENCE_FRAME left1 = left_mi->ref_frame[1];
171 :
172 0 : if (above_has_second && left_has_second) {
173 0 : pred_context = 1 + (above0 == LAST_FRAME || above1 == LAST_FRAME ||
174 0 : left0 == LAST_FRAME || left1 == LAST_FRAME);
175 0 : } else if (above_has_second || left_has_second) {
176 0 : const MV_REFERENCE_FRAME rfs = !above_has_second ? above0 : left0;
177 0 : const MV_REFERENCE_FRAME crf1 = above_has_second ? above0 : left0;
178 0 : const MV_REFERENCE_FRAME crf2 = above_has_second ? above1 : left1;
179 :
180 0 : if (rfs == LAST_FRAME)
181 0 : pred_context = 3 + (crf1 == LAST_FRAME || crf2 == LAST_FRAME);
182 : else
183 0 : pred_context = (crf1 == LAST_FRAME || crf2 == LAST_FRAME);
184 : } else {
185 0 : pred_context = 2 * (above0 == LAST_FRAME) + 2 * (left0 == LAST_FRAME);
186 : }
187 : }
188 0 : } else if (has_above || has_left) { // one edge available
189 0 : const MODE_INFO *edge_mi = has_above ? above_mi : left_mi;
190 0 : if (!is_inter_block(edge_mi)) { // intra
191 0 : pred_context = 2;
192 : } else { // inter
193 0 : if (!has_second_ref(edge_mi))
194 0 : pred_context = 4 * (edge_mi->ref_frame[0] == LAST_FRAME);
195 : else
196 0 : pred_context = 1 + (edge_mi->ref_frame[0] == LAST_FRAME ||
197 0 : edge_mi->ref_frame[1] == LAST_FRAME);
198 : }
199 : } else { // no edges available
200 0 : pred_context = 2;
201 : }
202 :
203 0 : assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
204 0 : return pred_context;
205 : }
206 :
207 0 : int vp9_get_pred_context_single_ref_p2(const MACROBLOCKD *xd) {
208 : int pred_context;
209 0 : const MODE_INFO *const above_mi = xd->above_mi;
210 0 : const MODE_INFO *const left_mi = xd->left_mi;
211 0 : const int has_above = !!above_mi;
212 0 : const int has_left = !!left_mi;
213 :
214 : // Note:
215 : // The mode info data structure has a one element border above and to the
216 : // left of the entries corresponding to real macroblocks.
217 : // The prediction flags in these dummy entries are initialized to 0.
218 0 : if (has_above && has_left) { // both edges available
219 0 : const int above_intra = !is_inter_block(above_mi);
220 0 : const int left_intra = !is_inter_block(left_mi);
221 :
222 0 : if (above_intra && left_intra) { // intra/intra
223 0 : pred_context = 2;
224 0 : } else if (above_intra || left_intra) { // intra/inter or inter/intra
225 0 : const MODE_INFO *edge_mi = above_intra ? left_mi : above_mi;
226 0 : if (!has_second_ref(edge_mi)) {
227 0 : if (edge_mi->ref_frame[0] == LAST_FRAME)
228 0 : pred_context = 3;
229 : else
230 0 : pred_context = 4 * (edge_mi->ref_frame[0] == GOLDEN_FRAME);
231 : } else {
232 0 : pred_context = 1 +
233 0 : 2 * (edge_mi->ref_frame[0] == GOLDEN_FRAME ||
234 0 : edge_mi->ref_frame[1] == GOLDEN_FRAME);
235 : }
236 : } else { // inter/inter
237 0 : const int above_has_second = has_second_ref(above_mi);
238 0 : const int left_has_second = has_second_ref(left_mi);
239 0 : const MV_REFERENCE_FRAME above0 = above_mi->ref_frame[0];
240 0 : const MV_REFERENCE_FRAME above1 = above_mi->ref_frame[1];
241 0 : const MV_REFERENCE_FRAME left0 = left_mi->ref_frame[0];
242 0 : const MV_REFERENCE_FRAME left1 = left_mi->ref_frame[1];
243 :
244 0 : if (above_has_second && left_has_second) {
245 0 : if (above0 == left0 && above1 == left1)
246 0 : pred_context =
247 0 : 3 * (above0 == GOLDEN_FRAME || above1 == GOLDEN_FRAME ||
248 0 : left0 == GOLDEN_FRAME || left1 == GOLDEN_FRAME);
249 : else
250 0 : pred_context = 2;
251 0 : } else if (above_has_second || left_has_second) {
252 0 : const MV_REFERENCE_FRAME rfs = !above_has_second ? above0 : left0;
253 0 : const MV_REFERENCE_FRAME crf1 = above_has_second ? above0 : left0;
254 0 : const MV_REFERENCE_FRAME crf2 = above_has_second ? above1 : left1;
255 :
256 0 : if (rfs == GOLDEN_FRAME)
257 0 : pred_context = 3 + (crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME);
258 0 : else if (rfs == ALTREF_FRAME)
259 0 : pred_context = crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME;
260 : else
261 0 : pred_context = 1 + 2 * (crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME);
262 : } else {
263 0 : if (above0 == LAST_FRAME && left0 == LAST_FRAME) {
264 0 : pred_context = 3;
265 0 : } else if (above0 == LAST_FRAME || left0 == LAST_FRAME) {
266 0 : const MV_REFERENCE_FRAME edge0 =
267 : (above0 == LAST_FRAME) ? left0 : above0;
268 0 : pred_context = 4 * (edge0 == GOLDEN_FRAME);
269 : } else {
270 0 : pred_context =
271 0 : 2 * (above0 == GOLDEN_FRAME) + 2 * (left0 == GOLDEN_FRAME);
272 : }
273 : }
274 : }
275 0 : } else if (has_above || has_left) { // one edge available
276 0 : const MODE_INFO *edge_mi = has_above ? above_mi : left_mi;
277 :
278 0 : if (!is_inter_block(edge_mi) ||
279 0 : (edge_mi->ref_frame[0] == LAST_FRAME && !has_second_ref(edge_mi)))
280 0 : pred_context = 2;
281 0 : else if (!has_second_ref(edge_mi))
282 0 : pred_context = 4 * (edge_mi->ref_frame[0] == GOLDEN_FRAME);
283 : else
284 0 : pred_context = 3 * (edge_mi->ref_frame[0] == GOLDEN_FRAME ||
285 0 : edge_mi->ref_frame[1] == GOLDEN_FRAME);
286 : } else { // no edges available (2)
287 0 : pred_context = 2;
288 : }
289 0 : assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
290 0 : return pred_context;
291 : }
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