summaryrefslogtreecommitdiffstats
path: root/media/libvpx/vp9/common/vp9_pred_common.c
blob: 0aac4a9e677bb5fe5023fefeec301d9c5df79917 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381

/*
 *  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 <limits.h>

#include "vp9/common/vp9_common.h"
#include "vp9/common/vp9_pred_common.h"
#include "vp9/common/vp9_seg_common.h"

// Returns a context number for the given MB prediction signal
int vp9_get_pred_context_switchable_interp(const MACROBLOCKD *xd) {
  // Note:
  // The mode info data structure has a one element border above and to the
  // left of the entries correpsonding to real macroblocks.
  // The prediction flags in these dummy entries are initialised to 0.
  const MB_MODE_INFO *const left_mbmi = xd->left_mbmi;
  const int left_type = xd->left_available && is_inter_block(left_mbmi) ?
                            left_mbmi->interp_filter : SWITCHABLE_FILTERS;
  const MB_MODE_INFO *const above_mbmi = xd->above_mbmi;
  const int above_type = xd->up_available && is_inter_block(above_mbmi) ?
                             above_mbmi->interp_filter : SWITCHABLE_FILTERS;

  if (left_type == above_type)
    return left_type;
  else if (left_type == SWITCHABLE_FILTERS && above_type != SWITCHABLE_FILTERS)
    return above_type;
  else if (left_type != SWITCHABLE_FILTERS && above_type == SWITCHABLE_FILTERS)
    return left_type;
  else
    return SWITCHABLE_FILTERS;
}

// The mode info data structure has a one element border above and to the
// left of the entries corresponding to real macroblocks.
// The prediction flags in these dummy entries are initialized to 0.
// 0 - inter/inter, inter/--, --/inter, --/--
// 1 - intra/inter, inter/intra
// 2 - intra/--, --/intra
// 3 - intra/intra
int vp9_get_intra_inter_context(const MACROBLOCKD *xd) {
  const MB_MODE_INFO *const above_mbmi = xd->above_mbmi;
  const MB_MODE_INFO *const left_mbmi = xd->left_mbmi;
  const int has_above = xd->up_available;
  const int has_left = xd->left_available;

  if (has_above && has_left) {  // both edges available
    const int above_intra = !is_inter_block(above_mbmi);
    const int left_intra = !is_inter_block(left_mbmi);
    return left_intra && above_intra ? 3
                                     : left_intra || above_intra;
  } else if (has_above || has_left) {  // one edge available
    return 2 * !is_inter_block(has_above ? above_mbmi : left_mbmi);
  } else {
    return 0;
  }
}

int vp9_get_reference_mode_context(const VP9_COMMON *cm,
                                   const MACROBLOCKD *xd) {
  int ctx;
  const MB_MODE_INFO *const above_mbmi = xd->above_mbmi;
  const MB_MODE_INFO *const left_mbmi = xd->left_mbmi;
  const int has_above = xd->up_available;
  const int has_left = xd->left_available;
  // Note:
  // The mode info data structure has a one element border above and to the
  // left of the entries correpsonding to real macroblocks.
  // The prediction flags in these dummy entries are initialised to 0.
  if (has_above && has_left) {  // both edges available
    if (!has_second_ref(above_mbmi) && !has_second_ref(left_mbmi))
      // neither edge uses comp pred (0/1)
      ctx = (above_mbmi->ref_frame[0] == cm->comp_fixed_ref) ^
            (left_mbmi->ref_frame[0] == cm->comp_fixed_ref);
    else if (!has_second_ref(above_mbmi))
      // one of two edges uses comp pred (2/3)
      ctx = 2 + (above_mbmi->ref_frame[0] == cm->comp_fixed_ref ||
                 !is_inter_block(above_mbmi));
    else if (!has_second_ref(left_mbmi))
      // one of two edges uses comp pred (2/3)
      ctx = 2 + (left_mbmi->ref_frame[0] == cm->comp_fixed_ref ||
                 !is_inter_block(left_mbmi));
    else  // both edges use comp pred (4)
      ctx = 4;
  } else if (has_above || has_left) {  // one edge available
    const MB_MODE_INFO *edge_mbmi = has_above ? above_mbmi : left_mbmi;

    if (!has_second_ref(edge_mbmi))
      // edge does not use comp pred (0/1)
      ctx = edge_mbmi->ref_frame[0] == cm->comp_fixed_ref;
    else
      // edge uses comp pred (3)
      ctx = 3;
  } else {  // no edges available (1)
    ctx = 1;
  }
  assert(ctx >= 0 && ctx < COMP_INTER_CONTEXTS);
  return ctx;
}

// Returns a context number for the given MB prediction signal
int vp9_get_pred_context_comp_ref_p(const VP9_COMMON *cm,
                                    const MACROBLOCKD *xd) {
  int pred_context;
  const MB_MODE_INFO *const above_mbmi = xd->above_mbmi;
  const MB_MODE_INFO *const left_mbmi = xd->left_mbmi;
  const int above_in_image = xd->up_available;
  const int left_in_image = xd->left_available;

  // Note:
  // The mode info data structure has a one element border above and to the
  // left of the entries correpsonding to real macroblocks.
  // The prediction flags in these dummy entries are initialised to 0.
  const int fix_ref_idx = cm->ref_frame_sign_bias[cm->comp_fixed_ref];
  const int var_ref_idx = !fix_ref_idx;

  if (above_in_image && left_in_image) {  // both edges available
    const int above_intra = !is_inter_block(above_mbmi);
    const int left_intra = !is_inter_block(left_mbmi);

    if (above_intra && left_intra) {  // intra/intra (2)
      pred_context = 2;
    } else if (above_intra || left_intra) {  // intra/inter
      const MB_MODE_INFO *edge_mbmi = above_intra ? left_mbmi : above_mbmi;

      if (!has_second_ref(edge_mbmi))  // single pred (1/3)
        pred_context = 1 + 2 * (edge_mbmi->ref_frame[0] != cm->comp_var_ref[1]);
      else  // comp pred (1/3)
        pred_context = 1 + 2 * (edge_mbmi->ref_frame[var_ref_idx]
                                    != cm->comp_var_ref[1]);
    } else {  // inter/inter
      const int l_sg = !has_second_ref(left_mbmi);
      const int a_sg = !has_second_ref(above_mbmi);
      const MV_REFERENCE_FRAME vrfa = a_sg ? above_mbmi->ref_frame[0]
                                           : above_mbmi->ref_frame[var_ref_idx];
      const MV_REFERENCE_FRAME vrfl = l_sg ? left_mbmi->ref_frame[0]
                                           : left_mbmi->ref_frame[var_ref_idx];

      if (vrfa == vrfl && cm->comp_var_ref[1] == vrfa) {
        pred_context = 0;
      } else if (l_sg && a_sg) {  // single/single
        if ((vrfa == cm->comp_fixed_ref && vrfl == cm->comp_var_ref[0]) ||
            (vrfl == cm->comp_fixed_ref && vrfa == cm->comp_var_ref[0]))
          pred_context = 4;
        else if (vrfa == vrfl)
          pred_context = 3;
        else
          pred_context = 1;
      } else if (l_sg || a_sg) {  // single/comp
        const MV_REFERENCE_FRAME vrfc = l_sg ? vrfa : vrfl;
        const MV_REFERENCE_FRAME rfs = a_sg ? vrfa : vrfl;
        if (vrfc == cm->comp_var_ref[1] && rfs != cm->comp_var_ref[1])
          pred_context = 1;
        else if (rfs == cm->comp_var_ref[1] && vrfc != cm->comp_var_ref[1])
          pred_context = 2;
        else
          pred_context = 4;
      } else if (vrfa == vrfl) {  // comp/comp
        pred_context = 4;
      } else {
        pred_context = 2;
      }
    }
  } else if (above_in_image || left_in_image) {  // one edge available
    const MB_MODE_INFO *edge_mbmi = above_in_image ? above_mbmi : left_mbmi;

    if (!is_inter_block(edge_mbmi)) {
      pred_context = 2;
    } else {
      if (has_second_ref(edge_mbmi))
        pred_context = 4 * (edge_mbmi->ref_frame[var_ref_idx]
                              != cm->comp_var_ref[1]);
      else
        pred_context = 3 * (edge_mbmi->ref_frame[0] != cm->comp_var_ref[1]);
    }
  } else {  // no edges available (2)
    pred_context = 2;
  }
  assert(pred_context >= 0 && pred_context < REF_CONTEXTS);

  return pred_context;
}

int vp9_get_pred_context_single_ref_p1(const MACROBLOCKD *xd) {
  int pred_context;
  const MB_MODE_INFO *const above_mbmi = xd->above_mbmi;
  const MB_MODE_INFO *const left_mbmi = xd->left_mbmi;
  const int has_above = xd->up_available;
  const int has_left = xd->left_available;
  // Note:
  // The mode info data structure has a one element border above and to the
  // left of the entries correpsonding to real macroblocks.
  // The prediction flags in these dummy entries are initialised to 0.
  if (has_above && has_left) {  // both edges available
    const int above_intra = !is_inter_block(above_mbmi);
    const int left_intra = !is_inter_block(left_mbmi);

    if (above_intra && left_intra) {  // intra/intra
      pred_context = 2;
    } else if (above_intra || left_intra) {  // intra/inter or inter/intra
      const MB_MODE_INFO *edge_mbmi = above_intra ? left_mbmi : above_mbmi;
      if (!has_second_ref(edge_mbmi))
        pred_context = 4 * (edge_mbmi->ref_frame[0] == LAST_FRAME);
      else
        pred_context = 1 + (edge_mbmi->ref_frame[0] == LAST_FRAME ||
                            edge_mbmi->ref_frame[1] == LAST_FRAME);
    } else {  // inter/inter
      const int above_has_second = has_second_ref(above_mbmi);
      const int left_has_second = has_second_ref(left_mbmi);
      const MV_REFERENCE_FRAME above0 = above_mbmi->ref_frame[0];
      const MV_REFERENCE_FRAME above1 = above_mbmi->ref_frame[1];
      const MV_REFERENCE_FRAME left0 = left_mbmi->ref_frame[0];
      const MV_REFERENCE_FRAME left1 = left_mbmi->ref_frame[1];

      if (above_has_second && left_has_second) {
        pred_context = 1 + (above0 == LAST_FRAME || above1 == LAST_FRAME ||
                            left0 == LAST_FRAME || left1 == LAST_FRAME);
      } else if (above_has_second || left_has_second) {
        const MV_REFERENCE_FRAME rfs = !above_has_second ? above0 : left0;
        const MV_REFERENCE_FRAME crf1 = above_has_second ? above0 : left0;
        const MV_REFERENCE_FRAME crf2 = above_has_second ? above1 : left1;

        if (rfs == LAST_FRAME)
          pred_context = 3 + (crf1 == LAST_FRAME || crf2 == LAST_FRAME);
        else
          pred_context = (crf1 == LAST_FRAME || crf2 == LAST_FRAME);
      } else {
        pred_context = 2 * (above0 == LAST_FRAME) + 2 * (left0 == LAST_FRAME);
      }
    }
  } else if (has_above || has_left) {  // one edge available
    const MB_MODE_INFO *edge_mbmi = has_above ? above_mbmi : left_mbmi;
    if (!is_inter_block(edge_mbmi)) {  // intra
      pred_context = 2;
    } else {  // inter
      if (!has_second_ref(edge_mbmi))
        pred_context = 4 * (edge_mbmi->ref_frame[0] == LAST_FRAME);
      else
        pred_context = 1 + (edge_mbmi->ref_frame[0] == LAST_FRAME ||
                            edge_mbmi->ref_frame[1] == LAST_FRAME);
    }
  } else {  // no edges available
    pred_context = 2;
  }

  assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
  return pred_context;
}

int vp9_get_pred_context_single_ref_p2(const MACROBLOCKD *xd) {
  int pred_context;
  const MB_MODE_INFO *const above_mbmi = xd->above_mbmi;
  const MB_MODE_INFO *const left_mbmi = xd->left_mbmi;
  const int has_above = xd->up_available;
  const int has_left = xd->left_available;

  // Note:
  // The mode info data structure has a one element border above and to the
  // left of the entries correpsonding to real macroblocks.
  // The prediction flags in these dummy entries are initialised to 0.
  if (has_above && has_left) {  // both edges available
    const int above_intra = !is_inter_block(above_mbmi);
    const int left_intra = !is_inter_block(left_mbmi);

    if (above_intra && left_intra) {  // intra/intra
      pred_context = 2;
    } else if (above_intra || left_intra) {  // intra/inter or inter/intra
      const MB_MODE_INFO *edge_mbmi = above_intra ? left_mbmi : above_mbmi;
      if (!has_second_ref(edge_mbmi)) {
        if (edge_mbmi->ref_frame[0] == LAST_FRAME)
          pred_context = 3;
        else
          pred_context = 4 * (edge_mbmi->ref_frame[0] == GOLDEN_FRAME);
      } else {
        pred_context = 1 + 2 * (edge_mbmi->ref_frame[0] == GOLDEN_FRAME ||
                                edge_mbmi->ref_frame[1] == GOLDEN_FRAME);
      }
    } else {  // inter/inter
      const int above_has_second = has_second_ref(above_mbmi);
      const int left_has_second = has_second_ref(left_mbmi);
      const MV_REFERENCE_FRAME above0 = above_mbmi->ref_frame[0];
      const MV_REFERENCE_FRAME above1 = above_mbmi->ref_frame[1];
      const MV_REFERENCE_FRAME left0 = left_mbmi->ref_frame[0];
      const MV_REFERENCE_FRAME left1 = left_mbmi->ref_frame[1];

      if (above_has_second && left_has_second) {
        if (above0 == left0 && above1 == left1)
          pred_context = 3 * (above0 == GOLDEN_FRAME ||
                              above1 == GOLDEN_FRAME ||
                              left0 == GOLDEN_FRAME ||
                              left1 == GOLDEN_FRAME);
        else
          pred_context = 2;
      } else if (above_has_second || left_has_second) {
        const MV_REFERENCE_FRAME rfs = !above_has_second ? above0 : left0;
        const MV_REFERENCE_FRAME crf1 = above_has_second ? above0 : left0;
        const MV_REFERENCE_FRAME crf2 = above_has_second ? above1 : left1;

        if (rfs == GOLDEN_FRAME)
          pred_context = 3 + (crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME);
        else if (rfs == ALTREF_FRAME)
          pred_context = crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME;
        else
          pred_context = 1 + 2 * (crf1 == GOLDEN_FRAME || crf2 == GOLDEN_FRAME);
      } else {
        if (above0 == LAST_FRAME && left0 == LAST_FRAME) {
          pred_context = 3;
        } else if (above0 == LAST_FRAME || left0 == LAST_FRAME) {
          const MV_REFERENCE_FRAME edge0 = (above0 == LAST_FRAME) ? left0
                                                                  : above0;
          pred_context = 4 * (edge0 == GOLDEN_FRAME);
        } else {
          pred_context = 2 * (above0 == GOLDEN_FRAME) +
                             2 * (left0 == GOLDEN_FRAME);
        }
      }
    }
  } else if (has_above || has_left) {  // one edge available
    const MB_MODE_INFO *edge_mbmi = has_above ? above_mbmi : left_mbmi;

    if (!is_inter_block(edge_mbmi) ||
        (edge_mbmi->ref_frame[0] == LAST_FRAME && !has_second_ref(edge_mbmi)))
      pred_context = 2;
    else if (!has_second_ref(edge_mbmi))
      pred_context = 4 * (edge_mbmi->ref_frame[0] == GOLDEN_FRAME);
    else
      pred_context = 3 * (edge_mbmi->ref_frame[0] == GOLDEN_FRAME ||
                          edge_mbmi->ref_frame[1] == GOLDEN_FRAME);
  } else {  // no edges available (2)
    pred_context = 2;
  }
  assert(pred_context >= 0 && pred_context < REF_CONTEXTS);
  return pred_context;
}
// Returns a context number for the given MB prediction signal
// The mode info data structure has a one element border above and to the
// left of the entries corresponding to real blocks.
// The prediction flags in these dummy entries are initialized to 0.
int vp9_get_tx_size_context(const MACROBLOCKD *xd) {
  const int max_tx_size = max_txsize_lookup[xd->mi[0]->mbmi.sb_type];
  const MB_MODE_INFO *const above_mbmi = xd->above_mbmi;
  const MB_MODE_INFO *const left_mbmi = xd->left_mbmi;
  const int has_above = xd->up_available;
  const int has_left = xd->left_available;
  int above_ctx = (has_above && !above_mbmi->skip) ? (int)above_mbmi->tx_size
                                                   : max_tx_size;
  int left_ctx = (has_left && !left_mbmi->skip) ? (int)left_mbmi->tx_size
                                                : max_tx_size;
  if (!has_left)
    left_ctx = above_ctx;

  if (!has_above)
    above_ctx = left_ctx;

  return (above_ctx + left_ctx) > max_tx_size;
}

int vp9_get_segment_id(const VP9_COMMON *cm, const uint8_t *segment_ids,
                       BLOCK_SIZE bsize, int mi_row, int mi_col) {
  const int mi_offset = mi_row * cm->mi_cols + mi_col;
  const int bw = num_8x8_blocks_wide_lookup[bsize];
  const int bh = num_8x8_blocks_high_lookup[bsize];
  const int xmis = MIN(cm->mi_cols - mi_col, bw);
  const int ymis = MIN(cm->mi_rows - mi_row, bh);
  int x, y, segment_id = INT_MAX;

  for (y = 0; y < ymis; y++)
    for (x = 0; x < xmis; x++)
      segment_id = MIN(segment_id,
                       segment_ids[mi_offset + y * cm->mi_cols + x]);

  assert(segment_id >= 0 && segment_id < MAX_SEGMENTS);
  return segment_id;
}