1 /*
2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved.
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12 #include <stdlib.h>
13
14 #include "av1/common/mvref_common.h"
15 #include "av1/common/warped_motion.h"
16
17 // Although we assign 32 bit integers, all the values are strictly under 14
18 // bits.
19 static int div_mult[32] = { 0, 16384, 8192, 5461, 4096, 3276, 2730, 2340,
20 2048, 1820, 1638, 1489, 1365, 1260, 1170, 1092,
21 1024, 963, 910, 862, 819, 780, 744, 712,
22 682, 655, 630, 606, 585, 564, 546, 528 };
23
24 // TODO(jingning): Consider the use of lookup table for (num / den)
25 // altogether.
get_mv_projection(MV * output,MV ref,int num,int den)26 static inline void get_mv_projection(MV *output, MV ref, int num, int den) {
27 den = AOMMIN(den, MAX_FRAME_DISTANCE);
28 num = num > 0 ? AOMMIN(num, MAX_FRAME_DISTANCE)
29 : AOMMAX(num, -MAX_FRAME_DISTANCE);
30 const int mv_row =
31 ROUND_POWER_OF_TWO_SIGNED(ref.row * num * div_mult[den], 14);
32 const int mv_col =
33 ROUND_POWER_OF_TWO_SIGNED(ref.col * num * div_mult[den], 14);
34 const int clamp_max = MV_UPP - 1;
35 const int clamp_min = MV_LOW + 1;
36 output->row = (int16_t)clamp(mv_row, clamp_min, clamp_max);
37 output->col = (int16_t)clamp(mv_col, clamp_min, clamp_max);
38 }
39
av1_copy_frame_mvs(const AV1_COMMON * const cm,const MB_MODE_INFO * const mi,int mi_row,int mi_col,int x_mis,int y_mis)40 void av1_copy_frame_mvs(const AV1_COMMON *const cm,
41 const MB_MODE_INFO *const mi, int mi_row, int mi_col,
42 int x_mis, int y_mis) {
43 const int frame_mvs_stride = ROUND_POWER_OF_TWO(cm->mi_params.mi_cols, 1);
44 MV_REF *frame_mvs =
45 cm->cur_frame->mvs + (mi_row >> 1) * frame_mvs_stride + (mi_col >> 1);
46 x_mis = ROUND_POWER_OF_TWO(x_mis, 1);
47 y_mis = ROUND_POWER_OF_TWO(y_mis, 1);
48 int w, h;
49
50 for (h = 0; h < y_mis; h++) {
51 MV_REF *mv = frame_mvs;
52 for (w = 0; w < x_mis; w++) {
53 mv->ref_frame = NONE_FRAME;
54 mv->mv.as_int = 0;
55
56 for (int idx = 0; idx < 2; ++idx) {
57 MV_REFERENCE_FRAME ref_frame = mi->ref_frame[idx];
58 if (ref_frame > INTRA_FRAME) {
59 int8_t ref_idx = cm->ref_frame_side[ref_frame];
60 if (ref_idx) continue;
61 if ((abs(mi->mv[idx].as_mv.row) > REFMVS_LIMIT) ||
62 (abs(mi->mv[idx].as_mv.col) > REFMVS_LIMIT))
63 continue;
64 mv->ref_frame = ref_frame;
65 mv->mv.as_int = mi->mv[idx].as_int;
66 }
67 }
68 mv++;
69 }
70 frame_mvs += frame_mvs_stride;
71 }
72 }
73
add_ref_mv_candidate(const MB_MODE_INFO * const candidate,const MV_REFERENCE_FRAME rf[2],uint8_t * refmv_count,uint8_t * ref_match_count,uint8_t * newmv_count,CANDIDATE_MV * ref_mv_stack,uint16_t * ref_mv_weight,int_mv * gm_mv_candidates,const WarpedMotionParams * gm_params,uint16_t weight)74 static inline void add_ref_mv_candidate(
75 const MB_MODE_INFO *const candidate, const MV_REFERENCE_FRAME rf[2],
76 uint8_t *refmv_count, uint8_t *ref_match_count, uint8_t *newmv_count,
77 CANDIDATE_MV *ref_mv_stack, uint16_t *ref_mv_weight,
78 int_mv *gm_mv_candidates, const WarpedMotionParams *gm_params,
79 uint16_t weight) {
80 if (!is_inter_block(candidate)) return;
81 assert(weight % 2 == 0);
82 int index, ref;
83
84 if (rf[1] == NONE_FRAME) {
85 // single reference frame
86 for (ref = 0; ref < 2; ++ref) {
87 if (candidate->ref_frame[ref] == rf[0]) {
88 const int is_gm_block =
89 is_global_mv_block(candidate, gm_params[rf[0]].wmtype);
90 const int_mv this_refmv =
91 is_gm_block ? gm_mv_candidates[0] : get_block_mv(candidate, ref);
92 for (index = 0; index < *refmv_count; ++index) {
93 if (ref_mv_stack[index].this_mv.as_int == this_refmv.as_int) {
94 ref_mv_weight[index] += weight;
95 break;
96 }
97 }
98
99 // Add a new item to the list.
100 if (index == *refmv_count && *refmv_count < MAX_REF_MV_STACK_SIZE) {
101 ref_mv_stack[index].this_mv = this_refmv;
102 ref_mv_weight[index] = weight;
103 ++(*refmv_count);
104 }
105 if (have_newmv_in_inter_mode(candidate->mode)) ++*newmv_count;
106 ++*ref_match_count;
107 }
108 }
109 } else {
110 // compound reference frame
111 if (candidate->ref_frame[0] == rf[0] && candidate->ref_frame[1] == rf[1]) {
112 int_mv this_refmv[2];
113
114 for (ref = 0; ref < 2; ++ref) {
115 if (is_global_mv_block(candidate, gm_params[rf[ref]].wmtype))
116 this_refmv[ref] = gm_mv_candidates[ref];
117 else
118 this_refmv[ref] = get_block_mv(candidate, ref);
119 }
120
121 for (index = 0; index < *refmv_count; ++index) {
122 if ((ref_mv_stack[index].this_mv.as_int == this_refmv[0].as_int) &&
123 (ref_mv_stack[index].comp_mv.as_int == this_refmv[1].as_int)) {
124 ref_mv_weight[index] += weight;
125 break;
126 }
127 }
128
129 // Add a new item to the list.
130 if (index == *refmv_count && *refmv_count < MAX_REF_MV_STACK_SIZE) {
131 ref_mv_stack[index].this_mv = this_refmv[0];
132 ref_mv_stack[index].comp_mv = this_refmv[1];
133 ref_mv_weight[index] = weight;
134 ++(*refmv_count);
135 }
136 if (have_newmv_in_inter_mode(candidate->mode)) ++*newmv_count;
137 ++*ref_match_count;
138 }
139 }
140 }
141
scan_row_mbmi(const AV1_COMMON * cm,const MACROBLOCKD * xd,int mi_col,const MV_REFERENCE_FRAME rf[2],int row_offset,CANDIDATE_MV * ref_mv_stack,uint16_t * ref_mv_weight,uint8_t * refmv_count,uint8_t * ref_match_count,uint8_t * newmv_count,int_mv * gm_mv_candidates,int max_row_offset,int * processed_rows)142 static inline void scan_row_mbmi(const AV1_COMMON *cm, const MACROBLOCKD *xd,
143 int mi_col, const MV_REFERENCE_FRAME rf[2],
144 int row_offset, CANDIDATE_MV *ref_mv_stack,
145 uint16_t *ref_mv_weight, uint8_t *refmv_count,
146 uint8_t *ref_match_count, uint8_t *newmv_count,
147 int_mv *gm_mv_candidates, int max_row_offset,
148 int *processed_rows) {
149 int end_mi = AOMMIN(xd->width, cm->mi_params.mi_cols - mi_col);
150 end_mi = AOMMIN(end_mi, mi_size_wide[BLOCK_64X64]);
151 const int width_8x8 = mi_size_wide[BLOCK_8X8];
152 const int width_16x16 = mi_size_wide[BLOCK_16X16];
153 int col_offset = 0;
154 // TODO(jingning): Revisit this part after cb4x4 is stable.
155 if (abs(row_offset) > 1) {
156 col_offset = 1;
157 if ((mi_col & 0x01) && xd->width < width_8x8) --col_offset;
158 }
159 const int use_step_16 = (xd->width >= 16);
160 MB_MODE_INFO **const candidate_mi0 = xd->mi + row_offset * xd->mi_stride;
161
162 for (int i = 0; i < end_mi;) {
163 const MB_MODE_INFO *const candidate = candidate_mi0[col_offset + i];
164 const int candidate_bsize = candidate->bsize;
165 const int n4_w = mi_size_wide[candidate_bsize];
166 int len = AOMMIN(xd->width, n4_w);
167 if (use_step_16)
168 len = AOMMAX(width_16x16, len);
169 else if (abs(row_offset) > 1)
170 len = AOMMAX(len, width_8x8);
171
172 uint16_t weight = 2;
173 if (xd->width >= width_8x8 && xd->width <= n4_w) {
174 uint16_t inc = AOMMIN(-max_row_offset + row_offset + 1,
175 mi_size_high[candidate_bsize]);
176 // Obtain range used in weight calculation.
177 weight = AOMMAX(weight, inc);
178 // Update processed rows.
179 *processed_rows = inc - row_offset - 1;
180 }
181
182 add_ref_mv_candidate(candidate, rf, refmv_count, ref_match_count,
183 newmv_count, ref_mv_stack, ref_mv_weight,
184 gm_mv_candidates, cm->global_motion, len * weight);
185
186 i += len;
187 }
188 }
189
scan_col_mbmi(const AV1_COMMON * cm,const MACROBLOCKD * xd,int mi_row,const MV_REFERENCE_FRAME rf[2],int col_offset,CANDIDATE_MV * ref_mv_stack,uint16_t * ref_mv_weight,uint8_t * refmv_count,uint8_t * ref_match_count,uint8_t * newmv_count,int_mv * gm_mv_candidates,int max_col_offset,int * processed_cols)190 static inline void scan_col_mbmi(const AV1_COMMON *cm, const MACROBLOCKD *xd,
191 int mi_row, const MV_REFERENCE_FRAME rf[2],
192 int col_offset, CANDIDATE_MV *ref_mv_stack,
193 uint16_t *ref_mv_weight, uint8_t *refmv_count,
194 uint8_t *ref_match_count, uint8_t *newmv_count,
195 int_mv *gm_mv_candidates, int max_col_offset,
196 int *processed_cols) {
197 int end_mi = AOMMIN(xd->height, cm->mi_params.mi_rows - mi_row);
198 end_mi = AOMMIN(end_mi, mi_size_high[BLOCK_64X64]);
199 const int n8_h_8 = mi_size_high[BLOCK_8X8];
200 const int n8_h_16 = mi_size_high[BLOCK_16X16];
201 int i;
202 int row_offset = 0;
203 if (abs(col_offset) > 1) {
204 row_offset = 1;
205 if ((mi_row & 0x01) && xd->height < n8_h_8) --row_offset;
206 }
207 const int use_step_16 = (xd->height >= 16);
208
209 for (i = 0; i < end_mi;) {
210 const MB_MODE_INFO *const candidate =
211 xd->mi[(row_offset + i) * xd->mi_stride + col_offset];
212 const int candidate_bsize = candidate->bsize;
213 const int n4_h = mi_size_high[candidate_bsize];
214 int len = AOMMIN(xd->height, n4_h);
215 if (use_step_16)
216 len = AOMMAX(n8_h_16, len);
217 else if (abs(col_offset) > 1)
218 len = AOMMAX(len, n8_h_8);
219
220 int weight = 2;
221 if (xd->height >= n8_h_8 && xd->height <= n4_h) {
222 int inc = AOMMIN(-max_col_offset + col_offset + 1,
223 mi_size_wide[candidate_bsize]);
224 // Obtain range used in weight calculation.
225 weight = AOMMAX(weight, inc);
226 // Update processed cols.
227 *processed_cols = inc - col_offset - 1;
228 }
229
230 add_ref_mv_candidate(candidate, rf, refmv_count, ref_match_count,
231 newmv_count, ref_mv_stack, ref_mv_weight,
232 gm_mv_candidates, cm->global_motion, len * weight);
233
234 i += len;
235 }
236 }
237
scan_blk_mbmi(const AV1_COMMON * cm,const MACROBLOCKD * xd,const int mi_row,const int mi_col,const MV_REFERENCE_FRAME rf[2],int row_offset,int col_offset,CANDIDATE_MV * ref_mv_stack,uint16_t * ref_mv_weight,uint8_t * ref_match_count,uint8_t * newmv_count,int_mv * gm_mv_candidates,uint8_t * refmv_count)238 static inline void scan_blk_mbmi(const AV1_COMMON *cm, const MACROBLOCKD *xd,
239 const int mi_row, const int mi_col,
240 const MV_REFERENCE_FRAME rf[2], int row_offset,
241 int col_offset, CANDIDATE_MV *ref_mv_stack,
242 uint16_t *ref_mv_weight,
243 uint8_t *ref_match_count, uint8_t *newmv_count,
244 int_mv *gm_mv_candidates,
245 uint8_t *refmv_count) {
246 const TileInfo *const tile = &xd->tile;
247 POSITION mi_pos;
248
249 mi_pos.row = row_offset;
250 mi_pos.col = col_offset;
251
252 if (is_inside(tile, mi_col, mi_row, &mi_pos)) {
253 const MB_MODE_INFO *const candidate =
254 xd->mi[mi_pos.row * xd->mi_stride + mi_pos.col];
255 const int len = mi_size_wide[BLOCK_8X8];
256
257 add_ref_mv_candidate(candidate, rf, refmv_count, ref_match_count,
258 newmv_count, ref_mv_stack, ref_mv_weight,
259 gm_mv_candidates, cm->global_motion, 2 * len);
260 } // Analyze a single 8x8 block motion information.
261 }
262
has_top_right(const AV1_COMMON * cm,const MACROBLOCKD * xd,int mi_row,int mi_col,int bs)263 static int has_top_right(const AV1_COMMON *cm, const MACROBLOCKD *xd,
264 int mi_row, int mi_col, int bs) {
265 const int sb_mi_size = mi_size_wide[cm->seq_params->sb_size];
266 const int mask_row = mi_row & (sb_mi_size - 1);
267 const int mask_col = mi_col & (sb_mi_size - 1);
268
269 if (bs > mi_size_wide[BLOCK_64X64]) return 0;
270
271 // In a split partition all apart from the bottom right has a top right
272 int has_tr = !((mask_row & bs) && (mask_col & bs));
273
274 // bs > 0 and bs is a power of 2
275 assert(bs > 0 && !(bs & (bs - 1)));
276
277 // For each 4x4 group of blocks, when the bottom right is decoded the blocks
278 // to the right have not been decoded therefore the bottom right does
279 // not have a top right
280 while (bs < sb_mi_size) {
281 if (mask_col & bs) {
282 if ((mask_col & (2 * bs)) && (mask_row & (2 * bs))) {
283 has_tr = 0;
284 break;
285 }
286 } else {
287 break;
288 }
289 bs <<= 1;
290 }
291
292 // In a VERTICAL or VERTICAL_4 partition, all partition before the last one
293 // always have a top right (as the block above will have been decoded).
294 if (xd->width < xd->height) {
295 if (!xd->is_last_vertical_rect) has_tr = 1;
296 }
297
298 // In a HORIZONTAL or HORIZONTAL_4 partition, partitions after the first one
299 // never have a top right (as the block to the right won't have been decoded).
300 if (xd->width > xd->height) {
301 if (!xd->is_first_horizontal_rect) has_tr = 0;
302 }
303
304 // The bottom left square of a Vertical A (in the old format) does
305 // not have a top right as it is decoded before the right hand
306 // rectangle of the partition
307 if (xd->mi[0]->partition == PARTITION_VERT_A) {
308 if (xd->width == xd->height)
309 if (mask_row & bs) has_tr = 0;
310 }
311
312 return has_tr;
313 }
314
check_sb_border(const int mi_row,const int mi_col,const int row_offset,const int col_offset)315 static int check_sb_border(const int mi_row, const int mi_col,
316 const int row_offset, const int col_offset) {
317 const int sb_mi_size = mi_size_wide[BLOCK_64X64];
318 const int row = mi_row & (sb_mi_size - 1);
319 const int col = mi_col & (sb_mi_size - 1);
320
321 if (row + row_offset < 0 || row + row_offset >= sb_mi_size ||
322 col + col_offset < 0 || col + col_offset >= sb_mi_size)
323 return 0;
324
325 return 1;
326 }
327
add_tpl_ref_mv(const AV1_COMMON * cm,const MACROBLOCKD * xd,int mi_row,int mi_col,MV_REFERENCE_FRAME ref_frame,int blk_row,int blk_col,int_mv * gm_mv_candidates,uint8_t * const refmv_count,CANDIDATE_MV ref_mv_stack[MAX_REF_MV_STACK_SIZE],uint16_t ref_mv_weight[MAX_REF_MV_STACK_SIZE],int16_t * mode_context)328 static int add_tpl_ref_mv(const AV1_COMMON *cm, const MACROBLOCKD *xd,
329 int mi_row, int mi_col, MV_REFERENCE_FRAME ref_frame,
330 int blk_row, int blk_col, int_mv *gm_mv_candidates,
331 uint8_t *const refmv_count,
332 CANDIDATE_MV ref_mv_stack[MAX_REF_MV_STACK_SIZE],
333 uint16_t ref_mv_weight[MAX_REF_MV_STACK_SIZE],
334 int16_t *mode_context) {
335 POSITION mi_pos;
336 mi_pos.row = (mi_row & 0x01) ? blk_row : blk_row + 1;
337 mi_pos.col = (mi_col & 0x01) ? blk_col : blk_col + 1;
338
339 if (!is_inside(&xd->tile, mi_col, mi_row, &mi_pos)) return 0;
340
341 const TPL_MV_REF *prev_frame_mvs =
342 cm->tpl_mvs +
343 ((mi_row + mi_pos.row) >> 1) * (cm->mi_params.mi_stride >> 1) +
344 ((mi_col + mi_pos.col) >> 1);
345 if (prev_frame_mvs->mfmv0.as_int == INVALID_MV) return 0;
346
347 MV_REFERENCE_FRAME rf[2];
348 av1_set_ref_frame(rf, ref_frame);
349
350 const uint16_t weight_unit = 1; // mi_size_wide[BLOCK_8X8];
351 const int cur_frame_index = cm->cur_frame->order_hint;
352 const RefCntBuffer *const buf_0 = get_ref_frame_buf(cm, rf[0]);
353 const int frame0_index = buf_0->order_hint;
354 const int cur_offset_0 = get_relative_dist(&cm->seq_params->order_hint_info,
355 cur_frame_index, frame0_index);
356 int idx;
357 const int allow_high_precision_mv = cm->features.allow_high_precision_mv;
358 const int force_integer_mv = cm->features.cur_frame_force_integer_mv;
359
360 int_mv this_refmv;
361 get_mv_projection(&this_refmv.as_mv, prev_frame_mvs->mfmv0.as_mv,
362 cur_offset_0, prev_frame_mvs->ref_frame_offset);
363 lower_mv_precision(&this_refmv.as_mv, allow_high_precision_mv,
364 force_integer_mv);
365
366 if (rf[1] == NONE_FRAME) {
367 if (blk_row == 0 && blk_col == 0) {
368 if (abs(this_refmv.as_mv.row - gm_mv_candidates[0].as_mv.row) >= 16 ||
369 abs(this_refmv.as_mv.col - gm_mv_candidates[0].as_mv.col) >= 16)
370 mode_context[ref_frame] |= (1 << GLOBALMV_OFFSET);
371 }
372
373 for (idx = 0; idx < *refmv_count; ++idx)
374 if (this_refmv.as_int == ref_mv_stack[idx].this_mv.as_int) break;
375
376 if (idx < *refmv_count) ref_mv_weight[idx] += 2 * weight_unit;
377
378 if (idx == *refmv_count && *refmv_count < MAX_REF_MV_STACK_SIZE) {
379 ref_mv_stack[idx].this_mv.as_int = this_refmv.as_int;
380 ref_mv_weight[idx] = 2 * weight_unit;
381 ++(*refmv_count);
382 }
383 } else {
384 // Process compound inter mode
385 const RefCntBuffer *const buf_1 = get_ref_frame_buf(cm, rf[1]);
386 const int frame1_index = buf_1->order_hint;
387 const int cur_offset_1 = get_relative_dist(&cm->seq_params->order_hint_info,
388 cur_frame_index, frame1_index);
389 int_mv comp_refmv;
390 get_mv_projection(&comp_refmv.as_mv, prev_frame_mvs->mfmv0.as_mv,
391 cur_offset_1, prev_frame_mvs->ref_frame_offset);
392 lower_mv_precision(&comp_refmv.as_mv, allow_high_precision_mv,
393 force_integer_mv);
394
395 if (blk_row == 0 && blk_col == 0) {
396 if (abs(this_refmv.as_mv.row - gm_mv_candidates[0].as_mv.row) >= 16 ||
397 abs(this_refmv.as_mv.col - gm_mv_candidates[0].as_mv.col) >= 16 ||
398 abs(comp_refmv.as_mv.row - gm_mv_candidates[1].as_mv.row) >= 16 ||
399 abs(comp_refmv.as_mv.col - gm_mv_candidates[1].as_mv.col) >= 16)
400 mode_context[ref_frame] |= (1 << GLOBALMV_OFFSET);
401 }
402
403 for (idx = 0; idx < *refmv_count; ++idx) {
404 if (this_refmv.as_int == ref_mv_stack[idx].this_mv.as_int &&
405 comp_refmv.as_int == ref_mv_stack[idx].comp_mv.as_int)
406 break;
407 }
408
409 if (idx < *refmv_count) ref_mv_weight[idx] += 2 * weight_unit;
410
411 if (idx == *refmv_count && *refmv_count < MAX_REF_MV_STACK_SIZE) {
412 ref_mv_stack[idx].this_mv.as_int = this_refmv.as_int;
413 ref_mv_stack[idx].comp_mv.as_int = comp_refmv.as_int;
414 ref_mv_weight[idx] = 2 * weight_unit;
415 ++(*refmv_count);
416 }
417 }
418
419 return 1;
420 }
421
process_compound_ref_mv_candidate(const MB_MODE_INFO * const candidate,const AV1_COMMON * const cm,const MV_REFERENCE_FRAME * const rf,int_mv ref_id[2][2],int ref_id_count[2],int_mv ref_diff[2][2],int ref_diff_count[2])422 static inline void process_compound_ref_mv_candidate(
423 const MB_MODE_INFO *const candidate, const AV1_COMMON *const cm,
424 const MV_REFERENCE_FRAME *const rf, int_mv ref_id[2][2],
425 int ref_id_count[2], int_mv ref_diff[2][2], int ref_diff_count[2]) {
426 for (int rf_idx = 0; rf_idx < 2; ++rf_idx) {
427 MV_REFERENCE_FRAME can_rf = candidate->ref_frame[rf_idx];
428
429 for (int cmp_idx = 0; cmp_idx < 2; ++cmp_idx) {
430 if (can_rf == rf[cmp_idx] && ref_id_count[cmp_idx] < 2) {
431 ref_id[cmp_idx][ref_id_count[cmp_idx]] = candidate->mv[rf_idx];
432 ++ref_id_count[cmp_idx];
433 } else if (can_rf > INTRA_FRAME && ref_diff_count[cmp_idx] < 2) {
434 int_mv this_mv = candidate->mv[rf_idx];
435 if (cm->ref_frame_sign_bias[can_rf] !=
436 cm->ref_frame_sign_bias[rf[cmp_idx]]) {
437 this_mv.as_mv.row = -this_mv.as_mv.row;
438 this_mv.as_mv.col = -this_mv.as_mv.col;
439 }
440 ref_diff[cmp_idx][ref_diff_count[cmp_idx]] = this_mv;
441 ++ref_diff_count[cmp_idx];
442 }
443 }
444 }
445 }
446
process_single_ref_mv_candidate(const MB_MODE_INFO * const candidate,const AV1_COMMON * const cm,MV_REFERENCE_FRAME ref_frame,uint8_t * const refmv_count,CANDIDATE_MV ref_mv_stack[MAX_REF_MV_STACK_SIZE],uint16_t ref_mv_weight[MAX_REF_MV_STACK_SIZE])447 static inline void process_single_ref_mv_candidate(
448 const MB_MODE_INFO *const candidate, const AV1_COMMON *const cm,
449 MV_REFERENCE_FRAME ref_frame, uint8_t *const refmv_count,
450 CANDIDATE_MV ref_mv_stack[MAX_REF_MV_STACK_SIZE],
451 uint16_t ref_mv_weight[MAX_REF_MV_STACK_SIZE]) {
452 for (int rf_idx = 0; rf_idx < 2; ++rf_idx) {
453 if (candidate->ref_frame[rf_idx] > INTRA_FRAME) {
454 int_mv this_mv = candidate->mv[rf_idx];
455 if (cm->ref_frame_sign_bias[candidate->ref_frame[rf_idx]] !=
456 cm->ref_frame_sign_bias[ref_frame]) {
457 this_mv.as_mv.row = -this_mv.as_mv.row;
458 this_mv.as_mv.col = -this_mv.as_mv.col;
459 }
460 int stack_idx;
461 for (stack_idx = 0; stack_idx < *refmv_count; ++stack_idx) {
462 const int_mv stack_mv = ref_mv_stack[stack_idx].this_mv;
463 if (this_mv.as_int == stack_mv.as_int) break;
464 }
465
466 if (stack_idx == *refmv_count) {
467 ref_mv_stack[stack_idx].this_mv = this_mv;
468
469 // TODO(jingning): Set an arbitrary small number here. The weight
470 // doesn't matter as long as it is properly initialized.
471 ref_mv_weight[stack_idx] = 2;
472 ++(*refmv_count);
473 }
474 }
475 }
476 }
477
setup_ref_mv_list(const AV1_COMMON * cm,const MACROBLOCKD * xd,MV_REFERENCE_FRAME ref_frame,uint8_t * const refmv_count,CANDIDATE_MV ref_mv_stack[MAX_REF_MV_STACK_SIZE],uint16_t ref_mv_weight[MAX_REF_MV_STACK_SIZE],int_mv mv_ref_list[MAX_MV_REF_CANDIDATES],int_mv * gm_mv_candidates,int mi_row,int mi_col,int16_t * mode_context)478 static inline void setup_ref_mv_list(
479 const AV1_COMMON *cm, const MACROBLOCKD *xd, MV_REFERENCE_FRAME ref_frame,
480 uint8_t *const refmv_count,
481 CANDIDATE_MV ref_mv_stack[MAX_REF_MV_STACK_SIZE],
482 uint16_t ref_mv_weight[MAX_REF_MV_STACK_SIZE],
483 int_mv mv_ref_list[MAX_MV_REF_CANDIDATES], int_mv *gm_mv_candidates,
484 int mi_row, int mi_col, int16_t *mode_context) {
485 const int bs = AOMMAX(xd->width, xd->height);
486 const int has_tr = has_top_right(cm, xd, mi_row, mi_col, bs);
487 MV_REFERENCE_FRAME rf[2];
488
489 const TileInfo *const tile = &xd->tile;
490 int max_row_offset = 0, max_col_offset = 0;
491 const int row_adj = (xd->height < mi_size_high[BLOCK_8X8]) && (mi_row & 0x01);
492 const int col_adj = (xd->width < mi_size_wide[BLOCK_8X8]) && (mi_col & 0x01);
493 int processed_rows = 0;
494 int processed_cols = 0;
495
496 av1_set_ref_frame(rf, ref_frame);
497 mode_context[ref_frame] = 0;
498 *refmv_count = 0;
499
500 // Find valid maximum row/col offset.
501 if (xd->up_available) {
502 max_row_offset = -(MVREF_ROW_COLS << 1) + row_adj;
503
504 if (xd->height < mi_size_high[BLOCK_8X8])
505 max_row_offset = -(2 << 1) + row_adj;
506
507 max_row_offset = find_valid_row_offset(tile, mi_row, max_row_offset);
508 }
509
510 if (xd->left_available) {
511 max_col_offset = -(MVREF_ROW_COLS << 1) + col_adj;
512
513 if (xd->width < mi_size_wide[BLOCK_8X8])
514 max_col_offset = -(2 << 1) + col_adj;
515
516 max_col_offset = find_valid_col_offset(tile, mi_col, max_col_offset);
517 }
518
519 uint8_t col_match_count = 0;
520 uint8_t row_match_count = 0;
521 uint8_t newmv_count = 0;
522
523 // Scan the first above row mode info. row_offset = -1;
524 if (abs(max_row_offset) >= 1)
525 scan_row_mbmi(cm, xd, mi_col, rf, -1, ref_mv_stack, ref_mv_weight,
526 refmv_count, &row_match_count, &newmv_count, gm_mv_candidates,
527 max_row_offset, &processed_rows);
528 // Scan the first left column mode info. col_offset = -1;
529 if (abs(max_col_offset) >= 1)
530 scan_col_mbmi(cm, xd, mi_row, rf, -1, ref_mv_stack, ref_mv_weight,
531 refmv_count, &col_match_count, &newmv_count, gm_mv_candidates,
532 max_col_offset, &processed_cols);
533 // Check top-right boundary
534 if (has_tr)
535 scan_blk_mbmi(cm, xd, mi_row, mi_col, rf, -1, xd->width, ref_mv_stack,
536 ref_mv_weight, &row_match_count, &newmv_count,
537 gm_mv_candidates, refmv_count);
538
539 const uint8_t nearest_match = (row_match_count > 0) + (col_match_count > 0);
540 const uint8_t nearest_refmv_count = *refmv_count;
541
542 // TODO(yunqing): for comp_search, do it for all 3 cases.
543 for (int idx = 0; idx < nearest_refmv_count; ++idx)
544 ref_mv_weight[idx] += REF_CAT_LEVEL;
545
546 if (cm->features.allow_ref_frame_mvs) {
547 int is_available = 0;
548 const int voffset = AOMMAX(mi_size_high[BLOCK_8X8], xd->height);
549 const int hoffset = AOMMAX(mi_size_wide[BLOCK_8X8], xd->width);
550 const int blk_row_end = AOMMIN(xd->height, mi_size_high[BLOCK_64X64]);
551 const int blk_col_end = AOMMIN(xd->width, mi_size_wide[BLOCK_64X64]);
552
553 const int tpl_sample_pos[3][2] = {
554 { voffset, -2 },
555 { voffset, hoffset },
556 { voffset - 2, hoffset },
557 };
558 const int allow_extension = (xd->height >= mi_size_high[BLOCK_8X8]) &&
559 (xd->height < mi_size_high[BLOCK_64X64]) &&
560 (xd->width >= mi_size_wide[BLOCK_8X8]) &&
561 (xd->width < mi_size_wide[BLOCK_64X64]);
562
563 const int step_h = (xd->height >= mi_size_high[BLOCK_64X64])
564 ? mi_size_high[BLOCK_16X16]
565 : mi_size_high[BLOCK_8X8];
566 const int step_w = (xd->width >= mi_size_wide[BLOCK_64X64])
567 ? mi_size_wide[BLOCK_16X16]
568 : mi_size_wide[BLOCK_8X8];
569
570 for (int blk_row = 0; blk_row < blk_row_end; blk_row += step_h) {
571 for (int blk_col = 0; blk_col < blk_col_end; blk_col += step_w) {
572 int ret = add_tpl_ref_mv(cm, xd, mi_row, mi_col, ref_frame, blk_row,
573 blk_col, gm_mv_candidates, refmv_count,
574 ref_mv_stack, ref_mv_weight, mode_context);
575 if (blk_row == 0 && blk_col == 0) is_available = ret;
576 }
577 }
578
579 if (is_available == 0) mode_context[ref_frame] |= (1 << GLOBALMV_OFFSET);
580
581 for (int i = 0; i < 3 && allow_extension; ++i) {
582 const int blk_row = tpl_sample_pos[i][0];
583 const int blk_col = tpl_sample_pos[i][1];
584
585 if (!check_sb_border(mi_row, mi_col, blk_row, blk_col)) continue;
586 add_tpl_ref_mv(cm, xd, mi_row, mi_col, ref_frame, blk_row, blk_col,
587 gm_mv_candidates, refmv_count, ref_mv_stack, ref_mv_weight,
588 mode_context);
589 }
590 }
591
592 uint8_t dummy_newmv_count = 0;
593
594 // Scan the second outer area.
595 scan_blk_mbmi(cm, xd, mi_row, mi_col, rf, -1, -1, ref_mv_stack, ref_mv_weight,
596 &row_match_count, &dummy_newmv_count, gm_mv_candidates,
597 refmv_count);
598
599 for (int idx = 2; idx <= MVREF_ROW_COLS; ++idx) {
600 const int row_offset = -(idx << 1) + 1 + row_adj;
601 const int col_offset = -(idx << 1) + 1 + col_adj;
602
603 if (abs(row_offset) <= abs(max_row_offset) &&
604 abs(row_offset) > processed_rows)
605 scan_row_mbmi(cm, xd, mi_col, rf, row_offset, ref_mv_stack, ref_mv_weight,
606 refmv_count, &row_match_count, &dummy_newmv_count,
607 gm_mv_candidates, max_row_offset, &processed_rows);
608
609 if (abs(col_offset) <= abs(max_col_offset) &&
610 abs(col_offset) > processed_cols)
611 scan_col_mbmi(cm, xd, mi_row, rf, col_offset, ref_mv_stack, ref_mv_weight,
612 refmv_count, &col_match_count, &dummy_newmv_count,
613 gm_mv_candidates, max_col_offset, &processed_cols);
614 }
615
616 const uint8_t ref_match_count = (row_match_count > 0) + (col_match_count > 0);
617
618 switch (nearest_match) {
619 case 0:
620 if (ref_match_count >= 1) mode_context[ref_frame] |= 1;
621 if (ref_match_count == 1)
622 mode_context[ref_frame] |= (1 << REFMV_OFFSET);
623 else if (ref_match_count >= 2)
624 mode_context[ref_frame] |= (2 << REFMV_OFFSET);
625 break;
626 case 1:
627 mode_context[ref_frame] |= (newmv_count > 0) ? 2 : 3;
628 if (ref_match_count == 1)
629 mode_context[ref_frame] |= (3 << REFMV_OFFSET);
630 else if (ref_match_count >= 2)
631 mode_context[ref_frame] |= (4 << REFMV_OFFSET);
632 break;
633 case 2:
634 default:
635 if (newmv_count >= 1)
636 mode_context[ref_frame] |= 4;
637 else
638 mode_context[ref_frame] |= 5;
639
640 mode_context[ref_frame] |= (5 << REFMV_OFFSET);
641 break;
642 }
643
644 // Rank the likelihood and assign nearest and near mvs.
645 int len = nearest_refmv_count;
646 while (len > 0) {
647 int nr_len = 0;
648 for (int idx = 1; idx < len; ++idx) {
649 if (ref_mv_weight[idx - 1] < ref_mv_weight[idx]) {
650 const CANDIDATE_MV tmp_mv = ref_mv_stack[idx - 1];
651 const uint16_t tmp_ref_mv_weight = ref_mv_weight[idx - 1];
652 ref_mv_stack[idx - 1] = ref_mv_stack[idx];
653 ref_mv_stack[idx] = tmp_mv;
654 ref_mv_weight[idx - 1] = ref_mv_weight[idx];
655 ref_mv_weight[idx] = tmp_ref_mv_weight;
656 nr_len = idx;
657 }
658 }
659 len = nr_len;
660 }
661
662 len = *refmv_count;
663 while (len > nearest_refmv_count) {
664 int nr_len = nearest_refmv_count;
665 for (int idx = nearest_refmv_count + 1; idx < len; ++idx) {
666 if (ref_mv_weight[idx - 1] < ref_mv_weight[idx]) {
667 const CANDIDATE_MV tmp_mv = ref_mv_stack[idx - 1];
668 const uint16_t tmp_ref_mv_weight = ref_mv_weight[idx - 1];
669 ref_mv_stack[idx - 1] = ref_mv_stack[idx];
670 ref_mv_stack[idx] = tmp_mv;
671 ref_mv_weight[idx - 1] = ref_mv_weight[idx];
672 ref_mv_weight[idx] = tmp_ref_mv_weight;
673 nr_len = idx;
674 }
675 }
676 len = nr_len;
677 }
678
679 int mi_width = AOMMIN(mi_size_wide[BLOCK_64X64], xd->width);
680 mi_width = AOMMIN(mi_width, cm->mi_params.mi_cols - mi_col);
681 int mi_height = AOMMIN(mi_size_high[BLOCK_64X64], xd->height);
682 mi_height = AOMMIN(mi_height, cm->mi_params.mi_rows - mi_row);
683 const int mi_size = AOMMIN(mi_width, mi_height);
684 if (rf[1] > NONE_FRAME) {
685 // TODO(jingning, yunqing): Refactor and consolidate the compound and
686 // single reference frame modes. Reduce unnecessary redundancy.
687 if (*refmv_count < MAX_MV_REF_CANDIDATES) {
688 int_mv ref_id[2][2], ref_diff[2][2];
689 int ref_id_count[2] = { 0 }, ref_diff_count[2] = { 0 };
690
691 for (int idx = 0; abs(max_row_offset) >= 1 && idx < mi_size;) {
692 const MB_MODE_INFO *const candidate = xd->mi[-xd->mi_stride + idx];
693 process_compound_ref_mv_candidate(
694 candidate, cm, rf, ref_id, ref_id_count, ref_diff, ref_diff_count);
695 idx += mi_size_wide[candidate->bsize];
696 }
697
698 for (int idx = 0; abs(max_col_offset) >= 1 && idx < mi_size;) {
699 const MB_MODE_INFO *const candidate = xd->mi[idx * xd->mi_stride - 1];
700 process_compound_ref_mv_candidate(
701 candidate, cm, rf, ref_id, ref_id_count, ref_diff, ref_diff_count);
702 idx += mi_size_high[candidate->bsize];
703 }
704
705 // Build up the compound mv predictor
706 int_mv comp_list[MAX_MV_REF_CANDIDATES][2];
707
708 for (int idx = 0; idx < 2; ++idx) {
709 int comp_idx = 0;
710 for (int list_idx = 0;
711 list_idx < ref_id_count[idx] && comp_idx < MAX_MV_REF_CANDIDATES;
712 ++list_idx, ++comp_idx)
713 comp_list[comp_idx][idx] = ref_id[idx][list_idx];
714 for (int list_idx = 0;
715 list_idx < ref_diff_count[idx] && comp_idx < MAX_MV_REF_CANDIDATES;
716 ++list_idx, ++comp_idx)
717 comp_list[comp_idx][idx] = ref_diff[idx][list_idx];
718 for (; comp_idx < MAX_MV_REF_CANDIDATES; ++comp_idx)
719 comp_list[comp_idx][idx] = gm_mv_candidates[idx];
720 }
721
722 if (*refmv_count) {
723 assert(*refmv_count == 1);
724 if (comp_list[0][0].as_int == ref_mv_stack[0].this_mv.as_int &&
725 comp_list[0][1].as_int == ref_mv_stack[0].comp_mv.as_int) {
726 ref_mv_stack[*refmv_count].this_mv = comp_list[1][0];
727 ref_mv_stack[*refmv_count].comp_mv = comp_list[1][1];
728 } else {
729 ref_mv_stack[*refmv_count].this_mv = comp_list[0][0];
730 ref_mv_stack[*refmv_count].comp_mv = comp_list[0][1];
731 }
732 ref_mv_weight[*refmv_count] = 2;
733 ++*refmv_count;
734 } else {
735 for (int idx = 0; idx < MAX_MV_REF_CANDIDATES; ++idx) {
736 ref_mv_stack[*refmv_count].this_mv = comp_list[idx][0];
737 ref_mv_stack[*refmv_count].comp_mv = comp_list[idx][1];
738 ref_mv_weight[*refmv_count] = 2;
739 ++*refmv_count;
740 }
741 }
742 }
743
744 assert(*refmv_count >= 2);
745
746 for (int idx = 0; idx < *refmv_count; ++idx) {
747 clamp_mv_ref(&ref_mv_stack[idx].this_mv.as_mv, xd->width << MI_SIZE_LOG2,
748 xd->height << MI_SIZE_LOG2, xd);
749 clamp_mv_ref(&ref_mv_stack[idx].comp_mv.as_mv, xd->width << MI_SIZE_LOG2,
750 xd->height << MI_SIZE_LOG2, xd);
751 }
752 } else {
753 // Handle single reference frame extension
754 for (int idx = 0; abs(max_row_offset) >= 1 && idx < mi_size &&
755 *refmv_count < MAX_MV_REF_CANDIDATES;) {
756 const MB_MODE_INFO *const candidate = xd->mi[-xd->mi_stride + idx];
757 process_single_ref_mv_candidate(candidate, cm, ref_frame, refmv_count,
758 ref_mv_stack, ref_mv_weight);
759 idx += mi_size_wide[candidate->bsize];
760 }
761
762 for (int idx = 0; abs(max_col_offset) >= 1 && idx < mi_size &&
763 *refmv_count < MAX_MV_REF_CANDIDATES;) {
764 const MB_MODE_INFO *const candidate = xd->mi[idx * xd->mi_stride - 1];
765 process_single_ref_mv_candidate(candidate, cm, ref_frame, refmv_count,
766 ref_mv_stack, ref_mv_weight);
767 idx += mi_size_high[candidate->bsize];
768 }
769
770 for (int idx = 0; idx < *refmv_count; ++idx) {
771 clamp_mv_ref(&ref_mv_stack[idx].this_mv.as_mv, xd->width << MI_SIZE_LOG2,
772 xd->height << MI_SIZE_LOG2, xd);
773 }
774
775 if (mv_ref_list != NULL) {
776 for (int idx = *refmv_count; idx < MAX_MV_REF_CANDIDATES; ++idx)
777 mv_ref_list[idx].as_int = gm_mv_candidates[0].as_int;
778
779 for (int idx = 0; idx < AOMMIN(MAX_MV_REF_CANDIDATES, *refmv_count);
780 ++idx) {
781 mv_ref_list[idx].as_int = ref_mv_stack[idx].this_mv.as_int;
782 }
783 }
784 }
785 }
786
av1_find_mv_refs(const AV1_COMMON * cm,const MACROBLOCKD * xd,MB_MODE_INFO * mi,MV_REFERENCE_FRAME ref_frame,uint8_t ref_mv_count[MODE_CTX_REF_FRAMES],CANDIDATE_MV ref_mv_stack[][MAX_REF_MV_STACK_SIZE],uint16_t ref_mv_weight[][MAX_REF_MV_STACK_SIZE],int_mv mv_ref_list[][MAX_MV_REF_CANDIDATES],int_mv * global_mvs,int16_t * mode_context)787 void av1_find_mv_refs(const AV1_COMMON *cm, const MACROBLOCKD *xd,
788 MB_MODE_INFO *mi, MV_REFERENCE_FRAME ref_frame,
789 uint8_t ref_mv_count[MODE_CTX_REF_FRAMES],
790 CANDIDATE_MV ref_mv_stack[][MAX_REF_MV_STACK_SIZE],
791 uint16_t ref_mv_weight[][MAX_REF_MV_STACK_SIZE],
792 int_mv mv_ref_list[][MAX_MV_REF_CANDIDATES],
793 int_mv *global_mvs, int16_t *mode_context) {
794 const int mi_row = xd->mi_row;
795 const int mi_col = xd->mi_col;
796 int_mv gm_mv[2];
797
798 if (ref_frame == INTRA_FRAME) {
799 gm_mv[0].as_int = gm_mv[1].as_int = 0;
800 if (global_mvs != NULL) {
801 global_mvs[ref_frame].as_int = INVALID_MV;
802 }
803 } else {
804 const BLOCK_SIZE bsize = mi->bsize;
805 const int allow_high_precision_mv = cm->features.allow_high_precision_mv;
806 const int force_integer_mv = cm->features.cur_frame_force_integer_mv;
807 if (ref_frame < REF_FRAMES) {
808 gm_mv[0] = gm_get_motion_vector(&cm->global_motion[ref_frame],
809 allow_high_precision_mv, bsize, mi_col,
810 mi_row, force_integer_mv);
811 gm_mv[1].as_int = 0;
812 if (global_mvs != NULL) global_mvs[ref_frame] = gm_mv[0];
813 } else {
814 MV_REFERENCE_FRAME rf[2];
815 av1_set_ref_frame(rf, ref_frame);
816 gm_mv[0] = gm_get_motion_vector(&cm->global_motion[rf[0]],
817 allow_high_precision_mv, bsize, mi_col,
818 mi_row, force_integer_mv);
819 gm_mv[1] = gm_get_motion_vector(&cm->global_motion[rf[1]],
820 allow_high_precision_mv, bsize, mi_col,
821 mi_row, force_integer_mv);
822 }
823 }
824
825 setup_ref_mv_list(cm, xd, ref_frame, &ref_mv_count[ref_frame],
826 ref_mv_stack[ref_frame], ref_mv_weight[ref_frame],
827 mv_ref_list ? mv_ref_list[ref_frame] : NULL, gm_mv, mi_row,
828 mi_col, mode_context);
829 }
830
av1_find_best_ref_mvs(int allow_hp,int_mv * mvlist,int_mv * nearest_mv,int_mv * near_mv,int is_integer)831 void av1_find_best_ref_mvs(int allow_hp, int_mv *mvlist, int_mv *nearest_mv,
832 int_mv *near_mv, int is_integer) {
833 int i;
834 // Make sure all the candidates are properly clamped etc
835 for (i = 0; i < MAX_MV_REF_CANDIDATES; ++i) {
836 lower_mv_precision(&mvlist[i].as_mv, allow_hp, is_integer);
837 }
838 *nearest_mv = mvlist[0];
839 *near_mv = mvlist[1];
840 }
841
av1_setup_frame_buf_refs(AV1_COMMON * cm)842 void av1_setup_frame_buf_refs(AV1_COMMON *cm) {
843 cm->cur_frame->order_hint = cm->current_frame.order_hint;
844 cm->cur_frame->display_order_hint = cm->current_frame.display_order_hint;
845 cm->cur_frame->pyramid_level = cm->current_frame.pyramid_level;
846 MV_REFERENCE_FRAME ref_frame;
847 for (ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ++ref_frame) {
848 const RefCntBuffer *const buf = get_ref_frame_buf(cm, ref_frame);
849 if (buf != NULL) {
850 cm->cur_frame->ref_order_hints[ref_frame - LAST_FRAME] = buf->order_hint;
851 cm->cur_frame->ref_display_order_hint[ref_frame - LAST_FRAME] =
852 buf->display_order_hint;
853 }
854 }
855 }
856
av1_setup_frame_sign_bias(AV1_COMMON * cm)857 void av1_setup_frame_sign_bias(AV1_COMMON *cm) {
858 MV_REFERENCE_FRAME ref_frame;
859 for (ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ++ref_frame) {
860 const RefCntBuffer *const buf = get_ref_frame_buf(cm, ref_frame);
861 if (cm->seq_params->order_hint_info.enable_order_hint && buf != NULL) {
862 const int ref_order_hint = buf->order_hint;
863 cm->ref_frame_sign_bias[ref_frame] =
864 (get_relative_dist(&cm->seq_params->order_hint_info, ref_order_hint,
865 (int)cm->current_frame.order_hint) <= 0)
866 ? 0
867 : 1;
868 } else {
869 cm->ref_frame_sign_bias[ref_frame] = 0;
870 }
871 }
872 }
873
874 #define MAX_OFFSET_WIDTH 64
875 #define MAX_OFFSET_HEIGHT 0
876
get_block_position(AV1_COMMON * cm,int * mi_r,int * mi_c,int blk_row,int blk_col,MV mv,int sign_bias)877 static int get_block_position(AV1_COMMON *cm, int *mi_r, int *mi_c, int blk_row,
878 int blk_col, MV mv, int sign_bias) {
879 const int base_blk_row = (blk_row >> 3) << 3;
880 const int base_blk_col = (blk_col >> 3) << 3;
881
882 const int row_offset = (mv.row >= 0) ? (mv.row >> (4 + MI_SIZE_LOG2))
883 : -((-mv.row) >> (4 + MI_SIZE_LOG2));
884
885 const int col_offset = (mv.col >= 0) ? (mv.col >> (4 + MI_SIZE_LOG2))
886 : -((-mv.col) >> (4 + MI_SIZE_LOG2));
887
888 const int row =
889 (sign_bias == 1) ? blk_row - row_offset : blk_row + row_offset;
890 const int col =
891 (sign_bias == 1) ? blk_col - col_offset : blk_col + col_offset;
892
893 if (row < 0 || row >= (cm->mi_params.mi_rows >> 1) || col < 0 ||
894 col >= (cm->mi_params.mi_cols >> 1))
895 return 0;
896
897 if (row < base_blk_row - (MAX_OFFSET_HEIGHT >> 3) ||
898 row >= base_blk_row + 8 + (MAX_OFFSET_HEIGHT >> 3) ||
899 col < base_blk_col - (MAX_OFFSET_WIDTH >> 3) ||
900 col >= base_blk_col + 8 + (MAX_OFFSET_WIDTH >> 3))
901 return 0;
902
903 *mi_r = row;
904 *mi_c = col;
905
906 return 1;
907 }
908
909 // Note: motion_filed_projection finds motion vectors of current frame's
910 // reference frame, and projects them to current frame. To make it clear,
911 // let's call current frame's reference frame as start frame.
912 // Call Start frame's reference frames as reference frames.
913 // Call ref_offset as frame distances between start frame and its reference
914 // frames.
motion_field_projection(AV1_COMMON * cm,MV_REFERENCE_FRAME start_frame,int dir)915 static int motion_field_projection(AV1_COMMON *cm,
916 MV_REFERENCE_FRAME start_frame, int dir) {
917 TPL_MV_REF *tpl_mvs_base = cm->tpl_mvs;
918 int ref_offset[REF_FRAMES] = { 0 };
919
920 const RefCntBuffer *const start_frame_buf =
921 get_ref_frame_buf(cm, start_frame);
922 if (start_frame_buf == NULL) return 0;
923
924 if (start_frame_buf->frame_type == KEY_FRAME ||
925 start_frame_buf->frame_type == INTRA_ONLY_FRAME)
926 return 0;
927
928 if (start_frame_buf->mi_rows != cm->mi_params.mi_rows ||
929 start_frame_buf->mi_cols != cm->mi_params.mi_cols)
930 return 0;
931
932 const int start_frame_order_hint = start_frame_buf->order_hint;
933 const unsigned int *const ref_order_hints =
934 &start_frame_buf->ref_order_hints[0];
935 const int cur_order_hint = cm->cur_frame->order_hint;
936 int start_to_current_frame_offset = get_relative_dist(
937 &cm->seq_params->order_hint_info, start_frame_order_hint, cur_order_hint);
938
939 for (MV_REFERENCE_FRAME rf = LAST_FRAME; rf <= INTER_REFS_PER_FRAME; ++rf) {
940 ref_offset[rf] = get_relative_dist(&cm->seq_params->order_hint_info,
941 start_frame_order_hint,
942 ref_order_hints[rf - LAST_FRAME]);
943 }
944
945 if (dir == 2) start_to_current_frame_offset = -start_to_current_frame_offset;
946
947 MV_REF *mv_ref_base = start_frame_buf->mvs;
948 const int mvs_rows = (cm->mi_params.mi_rows + 1) >> 1;
949 const int mvs_cols = (cm->mi_params.mi_cols + 1) >> 1;
950
951 for (int blk_row = 0; blk_row < mvs_rows; ++blk_row) {
952 for (int blk_col = 0; blk_col < mvs_cols; ++blk_col) {
953 MV_REF *mv_ref = &mv_ref_base[blk_row * mvs_cols + blk_col];
954 MV fwd_mv = mv_ref->mv.as_mv;
955
956 if (mv_ref->ref_frame > INTRA_FRAME) {
957 int_mv this_mv;
958 int mi_r, mi_c;
959 const int ref_frame_offset = ref_offset[mv_ref->ref_frame];
960
961 int pos_valid =
962 abs(ref_frame_offset) <= MAX_FRAME_DISTANCE &&
963 ref_frame_offset > 0 &&
964 abs(start_to_current_frame_offset) <= MAX_FRAME_DISTANCE;
965
966 if (pos_valid) {
967 get_mv_projection(&this_mv.as_mv, fwd_mv,
968 start_to_current_frame_offset, ref_frame_offset);
969 pos_valid = get_block_position(cm, &mi_r, &mi_c, blk_row, blk_col,
970 this_mv.as_mv, dir >> 1);
971 }
972
973 if (pos_valid) {
974 const int mi_offset = mi_r * (cm->mi_params.mi_stride >> 1) + mi_c;
975
976 tpl_mvs_base[mi_offset].mfmv0.as_mv.row = fwd_mv.row;
977 tpl_mvs_base[mi_offset].mfmv0.as_mv.col = fwd_mv.col;
978 tpl_mvs_base[mi_offset].ref_frame_offset = ref_frame_offset;
979 }
980 }
981 }
982 }
983
984 return 1;
985 }
986
987 // cm->ref_frame_side is calculated here, and will be used in
988 // av1_copy_frame_mvs() to affect how mvs are copied.
av1_calculate_ref_frame_side(AV1_COMMON * cm)989 void av1_calculate_ref_frame_side(AV1_COMMON *cm) {
990 const OrderHintInfo *const order_hint_info = &cm->seq_params->order_hint_info;
991
992 memset(cm->ref_frame_side, 0, sizeof(cm->ref_frame_side));
993 if (!order_hint_info->enable_order_hint) return;
994
995 const int cur_order_hint = cm->cur_frame->order_hint;
996
997 for (int ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ref_frame++) {
998 const RefCntBuffer *const buf = get_ref_frame_buf(cm, ref_frame);
999 int order_hint = 0;
1000
1001 if (buf != NULL) order_hint = buf->order_hint;
1002
1003 if (get_relative_dist(order_hint_info, order_hint, cur_order_hint) > 0)
1004 cm->ref_frame_side[ref_frame] = 1;
1005 else if (order_hint == cur_order_hint)
1006 cm->ref_frame_side[ref_frame] = -1;
1007 }
1008 }
1009
av1_setup_motion_field(AV1_COMMON * cm)1010 void av1_setup_motion_field(AV1_COMMON *cm) {
1011 const OrderHintInfo *const order_hint_info = &cm->seq_params->order_hint_info;
1012
1013 if (!order_hint_info->enable_order_hint) return;
1014
1015 TPL_MV_REF *tpl_mvs_base = cm->tpl_mvs;
1016 int size = ((cm->mi_params.mi_rows + MAX_MIB_SIZE) >> 1) *
1017 (cm->mi_params.mi_stride >> 1);
1018 for (int idx = 0; idx < size; ++idx) {
1019 tpl_mvs_base[idx].mfmv0.as_int = INVALID_MV;
1020 tpl_mvs_base[idx].ref_frame_offset = 0;
1021 }
1022
1023 const int cur_order_hint = cm->cur_frame->order_hint;
1024 const RefCntBuffer *ref_buf[INTER_REFS_PER_FRAME];
1025 int ref_order_hint[INTER_REFS_PER_FRAME];
1026
1027 for (int ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ref_frame++) {
1028 const int ref_idx = ref_frame - LAST_FRAME;
1029 const RefCntBuffer *const buf = get_ref_frame_buf(cm, ref_frame);
1030 int order_hint = 0;
1031
1032 if (buf != NULL) order_hint = buf->order_hint;
1033
1034 ref_buf[ref_idx] = buf;
1035 ref_order_hint[ref_idx] = order_hint;
1036 }
1037
1038 int ref_stamp = MFMV_STACK_SIZE - 1;
1039
1040 if (ref_buf[LAST_FRAME - LAST_FRAME] != NULL) {
1041 const int alt_of_lst_order_hint =
1042 ref_buf[LAST_FRAME - LAST_FRAME]
1043 ->ref_order_hints[ALTREF_FRAME - LAST_FRAME];
1044
1045 const int is_lst_overlay =
1046 (alt_of_lst_order_hint == ref_order_hint[GOLDEN_FRAME - LAST_FRAME]);
1047 if (!is_lst_overlay) motion_field_projection(cm, LAST_FRAME, 2);
1048 --ref_stamp;
1049 }
1050
1051 if (get_relative_dist(order_hint_info,
1052 ref_order_hint[BWDREF_FRAME - LAST_FRAME],
1053 cur_order_hint) > 0) {
1054 if (motion_field_projection(cm, BWDREF_FRAME, 0)) --ref_stamp;
1055 }
1056
1057 if (get_relative_dist(order_hint_info,
1058 ref_order_hint[ALTREF2_FRAME - LAST_FRAME],
1059 cur_order_hint) > 0) {
1060 if (motion_field_projection(cm, ALTREF2_FRAME, 0)) --ref_stamp;
1061 }
1062
1063 if (get_relative_dist(order_hint_info,
1064 ref_order_hint[ALTREF_FRAME - LAST_FRAME],
1065 cur_order_hint) > 0 &&
1066 ref_stamp >= 0)
1067 if (motion_field_projection(cm, ALTREF_FRAME, 0)) --ref_stamp;
1068
1069 if (ref_stamp >= 0) motion_field_projection(cm, LAST2_FRAME, 2);
1070 }
1071
record_samples(const MB_MODE_INFO * mbmi,int * pts,int * pts_inref,int row_offset,int sign_r,int col_offset,int sign_c)1072 static inline void record_samples(const MB_MODE_INFO *mbmi, int *pts,
1073 int *pts_inref, int row_offset, int sign_r,
1074 int col_offset, int sign_c) {
1075 const int bw = block_size_wide[mbmi->bsize];
1076 const int bh = block_size_high[mbmi->bsize];
1077 const int x = col_offset * MI_SIZE + sign_c * bw / 2 - 1;
1078 const int y = row_offset * MI_SIZE + sign_r * bh / 2 - 1;
1079
1080 pts[0] = GET_MV_SUBPEL(x);
1081 pts[1] = GET_MV_SUBPEL(y);
1082 pts_inref[0] = pts[0] + mbmi->mv[0].as_mv.col;
1083 pts_inref[1] = pts[1] + mbmi->mv[0].as_mv.row;
1084 }
1085
1086 // Select samples according to the motion vector difference.
av1_selectSamples(MV * mv,int * pts,int * pts_inref,int len,BLOCK_SIZE bsize)1087 uint8_t av1_selectSamples(MV *mv, int *pts, int *pts_inref, int len,
1088 BLOCK_SIZE bsize) {
1089 const int bw = block_size_wide[bsize];
1090 const int bh = block_size_high[bsize];
1091 const int thresh = clamp(AOMMAX(bw, bh), 16, 112);
1092 uint8_t ret = 0;
1093 assert(len <= LEAST_SQUARES_SAMPLES_MAX);
1094
1095 // Only keep the samples with MV differences within threshold.
1096 for (int i = 0; i < len; ++i) {
1097 const int diff = abs(pts_inref[2 * i] - pts[2 * i] - mv->col) +
1098 abs(pts_inref[2 * i + 1] - pts[2 * i + 1] - mv->row);
1099 if (diff > thresh) continue;
1100 if (ret != i) {
1101 memcpy(pts + 2 * ret, pts + 2 * i, 2 * sizeof(pts[0]));
1102 memcpy(pts_inref + 2 * ret, pts_inref + 2 * i, 2 * sizeof(pts_inref[0]));
1103 }
1104 ++ret;
1105 }
1106 // Keep at least 1 sample.
1107 return AOMMAX(ret, 1);
1108 }
1109
1110 // Note: Samples returned are at 1/8-pel precision
1111 // Sample are the neighbor block center point's coordinates relative to the
1112 // left-top pixel of current block.
av1_findSamples(const AV1_COMMON * cm,MACROBLOCKD * xd,int * pts,int * pts_inref)1113 uint8_t av1_findSamples(const AV1_COMMON *cm, MACROBLOCKD *xd, int *pts,
1114 int *pts_inref) {
1115 const MB_MODE_INFO *const mbmi0 = xd->mi[0];
1116 const int ref_frame = mbmi0->ref_frame[0];
1117 const int up_available = xd->up_available;
1118 const int left_available = xd->left_available;
1119 uint8_t np = 0;
1120 int do_tl = 1;
1121 int do_tr = 1;
1122 const int mi_stride = xd->mi_stride;
1123 const int mi_row = xd->mi_row;
1124 const int mi_col = xd->mi_col;
1125
1126 // scan the nearest above rows
1127 if (up_available) {
1128 const int mi_row_offset = -1;
1129 const MB_MODE_INFO *mbmi = xd->mi[mi_row_offset * mi_stride];
1130 uint8_t superblock_width = mi_size_wide[mbmi->bsize];
1131
1132 if (xd->width <= superblock_width) {
1133 // Handle "current block width <= above block width" case.
1134 const int col_offset = -mi_col % superblock_width;
1135
1136 if (col_offset < 0) do_tl = 0;
1137 if (col_offset + superblock_width > xd->width) do_tr = 0;
1138
1139 if (mbmi->ref_frame[0] == ref_frame && mbmi->ref_frame[1] == NONE_FRAME) {
1140 record_samples(mbmi, pts, pts_inref, 0, -1, col_offset, 1);
1141 pts += 2;
1142 pts_inref += 2;
1143 if (++np >= LEAST_SQUARES_SAMPLES_MAX) return LEAST_SQUARES_SAMPLES_MAX;
1144 }
1145 } else {
1146 // Handle "current block width > above block width" case.
1147 for (int i = 0; i < AOMMIN(xd->width, cm->mi_params.mi_cols - mi_col);
1148 i += superblock_width) {
1149 mbmi = xd->mi[i + mi_row_offset * mi_stride];
1150 superblock_width = mi_size_wide[mbmi->bsize];
1151
1152 if (mbmi->ref_frame[0] == ref_frame &&
1153 mbmi->ref_frame[1] == NONE_FRAME) {
1154 record_samples(mbmi, pts, pts_inref, 0, -1, i, 1);
1155 pts += 2;
1156 pts_inref += 2;
1157 if (++np >= LEAST_SQUARES_SAMPLES_MAX)
1158 return LEAST_SQUARES_SAMPLES_MAX;
1159 }
1160 }
1161 }
1162 }
1163 assert(np <= LEAST_SQUARES_SAMPLES_MAX);
1164
1165 // scan the nearest left columns
1166 if (left_available) {
1167 const int mi_col_offset = -1;
1168 const MB_MODE_INFO *mbmi = xd->mi[mi_col_offset];
1169 uint8_t superblock_height = mi_size_high[mbmi->bsize];
1170
1171 if (xd->height <= superblock_height) {
1172 // Handle "current block height <= above block height" case.
1173 const int row_offset = -mi_row % superblock_height;
1174
1175 if (row_offset < 0) do_tl = 0;
1176
1177 if (mbmi->ref_frame[0] == ref_frame && mbmi->ref_frame[1] == NONE_FRAME) {
1178 record_samples(mbmi, pts, pts_inref, row_offset, 1, 0, -1);
1179 pts += 2;
1180 pts_inref += 2;
1181 np++;
1182 if (np >= LEAST_SQUARES_SAMPLES_MAX) return LEAST_SQUARES_SAMPLES_MAX;
1183 }
1184 } else {
1185 // Handle "current block height > above block height" case.
1186 for (int i = 0; i < AOMMIN(xd->height, cm->mi_params.mi_rows - mi_row);
1187 i += superblock_height) {
1188 mbmi = xd->mi[mi_col_offset + i * mi_stride];
1189 superblock_height = mi_size_high[mbmi->bsize];
1190
1191 if (mbmi->ref_frame[0] == ref_frame &&
1192 mbmi->ref_frame[1] == NONE_FRAME) {
1193 record_samples(mbmi, pts, pts_inref, i, 1, 0, -1);
1194 pts += 2;
1195 pts_inref += 2;
1196 if (++np >= LEAST_SQUARES_SAMPLES_MAX)
1197 return LEAST_SQUARES_SAMPLES_MAX;
1198 }
1199 }
1200 }
1201 }
1202 assert(np <= LEAST_SQUARES_SAMPLES_MAX);
1203
1204 // Top-left block
1205 if (do_tl && left_available && up_available) {
1206 const int mi_row_offset = -1;
1207 const int mi_col_offset = -1;
1208 MB_MODE_INFO *mbmi = xd->mi[mi_col_offset + mi_row_offset * mi_stride];
1209
1210 if (mbmi->ref_frame[0] == ref_frame && mbmi->ref_frame[1] == NONE_FRAME) {
1211 record_samples(mbmi, pts, pts_inref, 0, -1, 0, -1);
1212 pts += 2;
1213 pts_inref += 2;
1214 if (++np >= LEAST_SQUARES_SAMPLES_MAX) return LEAST_SQUARES_SAMPLES_MAX;
1215 }
1216 }
1217 assert(np <= LEAST_SQUARES_SAMPLES_MAX);
1218
1219 // Top-right block
1220 if (do_tr &&
1221 has_top_right(cm, xd, mi_row, mi_col, AOMMAX(xd->width, xd->height))) {
1222 const POSITION trb_pos = { -1, xd->width };
1223 const TileInfo *const tile = &xd->tile;
1224 if (is_inside(tile, mi_col, mi_row, &trb_pos)) {
1225 const int mi_row_offset = -1;
1226 const int mi_col_offset = xd->width;
1227 const MB_MODE_INFO *mbmi =
1228 xd->mi[mi_col_offset + mi_row_offset * mi_stride];
1229
1230 if (mbmi->ref_frame[0] == ref_frame && mbmi->ref_frame[1] == NONE_FRAME) {
1231 record_samples(mbmi, pts, pts_inref, 0, -1, xd->width, 1);
1232 if (++np >= LEAST_SQUARES_SAMPLES_MAX) return LEAST_SQUARES_SAMPLES_MAX;
1233 }
1234 }
1235 }
1236 assert(np <= LEAST_SQUARES_SAMPLES_MAX);
1237
1238 return np;
1239 }
1240
av1_setup_skip_mode_allowed(AV1_COMMON * cm)1241 void av1_setup_skip_mode_allowed(AV1_COMMON *cm) {
1242 const OrderHintInfo *const order_hint_info = &cm->seq_params->order_hint_info;
1243 SkipModeInfo *const skip_mode_info = &cm->current_frame.skip_mode_info;
1244
1245 skip_mode_info->skip_mode_allowed = 0;
1246 skip_mode_info->ref_frame_idx_0 = INVALID_IDX;
1247 skip_mode_info->ref_frame_idx_1 = INVALID_IDX;
1248
1249 if (!order_hint_info->enable_order_hint || frame_is_intra_only(cm) ||
1250 cm->current_frame.reference_mode == SINGLE_REFERENCE)
1251 return;
1252
1253 const int cur_order_hint = cm->current_frame.order_hint;
1254 int ref_order_hints[2] = { -1, INT_MAX };
1255 int ref_idx[2] = { INVALID_IDX, INVALID_IDX };
1256
1257 // Identify the nearest forward and backward references.
1258 for (int i = 0; i < INTER_REFS_PER_FRAME; ++i) {
1259 const RefCntBuffer *const buf = get_ref_frame_buf(cm, LAST_FRAME + i);
1260 if (buf == NULL) continue;
1261
1262 const int ref_order_hint = buf->order_hint;
1263 if (get_relative_dist(order_hint_info, ref_order_hint, cur_order_hint) <
1264 0) {
1265 // Forward reference
1266 if (ref_order_hints[0] == -1 ||
1267 get_relative_dist(order_hint_info, ref_order_hint,
1268 ref_order_hints[0]) > 0) {
1269 ref_order_hints[0] = ref_order_hint;
1270 ref_idx[0] = i;
1271 }
1272 } else if (get_relative_dist(order_hint_info, ref_order_hint,
1273 cur_order_hint) > 0) {
1274 // Backward reference
1275 if (ref_order_hints[1] == INT_MAX ||
1276 get_relative_dist(order_hint_info, ref_order_hint,
1277 ref_order_hints[1]) < 0) {
1278 ref_order_hints[1] = ref_order_hint;
1279 ref_idx[1] = i;
1280 }
1281 }
1282 }
1283
1284 if (ref_idx[0] != INVALID_IDX && ref_idx[1] != INVALID_IDX) {
1285 // == Bi-directional prediction ==
1286 skip_mode_info->skip_mode_allowed = 1;
1287 skip_mode_info->ref_frame_idx_0 = AOMMIN(ref_idx[0], ref_idx[1]);
1288 skip_mode_info->ref_frame_idx_1 = AOMMAX(ref_idx[0], ref_idx[1]);
1289 } else if (ref_idx[0] != INVALID_IDX && ref_idx[1] == INVALID_IDX) {
1290 // == Forward prediction only ==
1291 // Identify the second nearest forward reference.
1292 ref_order_hints[1] = -1;
1293 for (int i = 0; i < INTER_REFS_PER_FRAME; ++i) {
1294 const RefCntBuffer *const buf = get_ref_frame_buf(cm, LAST_FRAME + i);
1295 if (buf == NULL) continue;
1296
1297 const int ref_order_hint = buf->order_hint;
1298 if ((ref_order_hints[0] != -1 &&
1299 get_relative_dist(order_hint_info, ref_order_hint,
1300 ref_order_hints[0]) < 0) &&
1301 (ref_order_hints[1] == -1 ||
1302 get_relative_dist(order_hint_info, ref_order_hint,
1303 ref_order_hints[1]) > 0)) {
1304 // Second closest forward reference
1305 ref_order_hints[1] = ref_order_hint;
1306 ref_idx[1] = i;
1307 }
1308 }
1309 if (ref_order_hints[1] != -1) {
1310 skip_mode_info->skip_mode_allowed = 1;
1311 skip_mode_info->ref_frame_idx_0 = AOMMIN(ref_idx[0], ref_idx[1]);
1312 skip_mode_info->ref_frame_idx_1 = AOMMAX(ref_idx[0], ref_idx[1]);
1313 }
1314 }
1315 }
1316
1317 typedef struct {
1318 int map_idx; // frame map index
1319 RefCntBuffer *buf; // frame buffer
1320 int sort_idx; // index based on the offset to be used for sorting
1321 } REF_FRAME_INFO;
1322
1323 // Compares the sort_idx fields. If they are equal, then compares the map_idx
1324 // fields to break the tie. This ensures a stable sort.
compare_ref_frame_info(const void * arg_a,const void * arg_b)1325 static int compare_ref_frame_info(const void *arg_a, const void *arg_b) {
1326 const REF_FRAME_INFO *info_a = (REF_FRAME_INFO *)arg_a;
1327 const REF_FRAME_INFO *info_b = (REF_FRAME_INFO *)arg_b;
1328
1329 const int sort_idx_diff = info_a->sort_idx - info_b->sort_idx;
1330 if (sort_idx_diff != 0) return sort_idx_diff;
1331 return info_a->map_idx - info_b->map_idx;
1332 }
1333
set_ref_frame_info(int * remapped_ref_idx,int frame_idx,REF_FRAME_INFO * ref_info)1334 static inline void set_ref_frame_info(int *remapped_ref_idx, int frame_idx,
1335 REF_FRAME_INFO *ref_info) {
1336 assert(frame_idx >= 0 && frame_idx < INTER_REFS_PER_FRAME);
1337
1338 remapped_ref_idx[frame_idx] = ref_info->map_idx;
1339 }
1340
av1_set_frame_refs(AV1_COMMON * const cm,int * remapped_ref_idx,int lst_map_idx,int gld_map_idx)1341 void av1_set_frame_refs(AV1_COMMON *const cm, int *remapped_ref_idx,
1342 int lst_map_idx, int gld_map_idx) {
1343 int lst_frame_sort_idx = -1;
1344 int gld_frame_sort_idx = -1;
1345
1346 assert(cm->seq_params->order_hint_info.enable_order_hint);
1347 assert(cm->seq_params->order_hint_info.order_hint_bits_minus_1 >= 0);
1348 const int cur_order_hint = (int)cm->current_frame.order_hint;
1349 const int cur_frame_sort_idx =
1350 1 << cm->seq_params->order_hint_info.order_hint_bits_minus_1;
1351
1352 REF_FRAME_INFO ref_frame_info[REF_FRAMES];
1353 int ref_flag_list[INTER_REFS_PER_FRAME] = { 0, 0, 0, 0, 0, 0, 0 };
1354
1355 for (int i = 0; i < REF_FRAMES; ++i) {
1356 const int map_idx = i;
1357
1358 ref_frame_info[i].map_idx = map_idx;
1359 ref_frame_info[i].sort_idx = -1;
1360
1361 RefCntBuffer *const buf = cm->ref_frame_map[map_idx];
1362 ref_frame_info[i].buf = buf;
1363
1364 if (buf == NULL) continue;
1365 // If this assertion fails, there is a reference leak.
1366 assert(buf->ref_count > 0);
1367
1368 const int offset = (int)buf->order_hint;
1369 ref_frame_info[i].sort_idx =
1370 (offset == -1) ? -1
1371 : cur_frame_sort_idx +
1372 get_relative_dist(&cm->seq_params->order_hint_info,
1373 offset, cur_order_hint);
1374 assert(ref_frame_info[i].sort_idx >= -1);
1375
1376 if (map_idx == lst_map_idx) lst_frame_sort_idx = ref_frame_info[i].sort_idx;
1377 if (map_idx == gld_map_idx) gld_frame_sort_idx = ref_frame_info[i].sort_idx;
1378 }
1379
1380 // Confirm both LAST_FRAME and GOLDEN_FRAME are valid forward reference
1381 // frames.
1382 if (lst_frame_sort_idx == -1 || lst_frame_sort_idx >= cur_frame_sort_idx) {
1383 aom_internal_error(cm->error, AOM_CODEC_CORRUPT_FRAME,
1384 "Inter frame requests a look-ahead frame as LAST");
1385 }
1386 if (gld_frame_sort_idx == -1 || gld_frame_sort_idx >= cur_frame_sort_idx) {
1387 aom_internal_error(cm->error, AOM_CODEC_CORRUPT_FRAME,
1388 "Inter frame requests a look-ahead frame as GOLDEN");
1389 }
1390
1391 // Sort ref frames based on their frame_offset values.
1392 qsort(ref_frame_info, REF_FRAMES, sizeof(REF_FRAME_INFO),
1393 compare_ref_frame_info);
1394
1395 // Identify forward and backward reference frames.
1396 // Forward reference: offset < order_hint
1397 // Backward reference: offset >= order_hint
1398 int fwd_start_idx = 0, fwd_end_idx = REF_FRAMES - 1;
1399
1400 for (int i = 0; i < REF_FRAMES; i++) {
1401 if (ref_frame_info[i].sort_idx == -1) {
1402 fwd_start_idx++;
1403 continue;
1404 }
1405
1406 if (ref_frame_info[i].sort_idx >= cur_frame_sort_idx) {
1407 fwd_end_idx = i - 1;
1408 break;
1409 }
1410 }
1411
1412 int bwd_start_idx = fwd_end_idx + 1;
1413 int bwd_end_idx = REF_FRAMES - 1;
1414
1415 // === Backward Reference Frames ===
1416
1417 // == ALTREF_FRAME ==
1418 if (bwd_start_idx <= bwd_end_idx) {
1419 set_ref_frame_info(remapped_ref_idx, ALTREF_FRAME - LAST_FRAME,
1420 &ref_frame_info[bwd_end_idx]);
1421 ref_flag_list[ALTREF_FRAME - LAST_FRAME] = 1;
1422 bwd_end_idx--;
1423 }
1424
1425 // == BWDREF_FRAME ==
1426 if (bwd_start_idx <= bwd_end_idx) {
1427 set_ref_frame_info(remapped_ref_idx, BWDREF_FRAME - LAST_FRAME,
1428 &ref_frame_info[bwd_start_idx]);
1429 ref_flag_list[BWDREF_FRAME - LAST_FRAME] = 1;
1430 bwd_start_idx++;
1431 }
1432
1433 // == ALTREF2_FRAME ==
1434 if (bwd_start_idx <= bwd_end_idx) {
1435 set_ref_frame_info(remapped_ref_idx, ALTREF2_FRAME - LAST_FRAME,
1436 &ref_frame_info[bwd_start_idx]);
1437 ref_flag_list[ALTREF2_FRAME - LAST_FRAME] = 1;
1438 }
1439
1440 // === Forward Reference Frames ===
1441
1442 for (int i = fwd_start_idx; i <= fwd_end_idx; ++i) {
1443 // == LAST_FRAME ==
1444 if (ref_frame_info[i].map_idx == lst_map_idx) {
1445 set_ref_frame_info(remapped_ref_idx, LAST_FRAME - LAST_FRAME,
1446 &ref_frame_info[i]);
1447 ref_flag_list[LAST_FRAME - LAST_FRAME] = 1;
1448 }
1449
1450 // == GOLDEN_FRAME ==
1451 if (ref_frame_info[i].map_idx == gld_map_idx) {
1452 set_ref_frame_info(remapped_ref_idx, GOLDEN_FRAME - LAST_FRAME,
1453 &ref_frame_info[i]);
1454 ref_flag_list[GOLDEN_FRAME - LAST_FRAME] = 1;
1455 }
1456 }
1457
1458 assert(ref_flag_list[LAST_FRAME - LAST_FRAME] == 1 &&
1459 ref_flag_list[GOLDEN_FRAME - LAST_FRAME] == 1);
1460
1461 // == LAST2_FRAME ==
1462 // == LAST3_FRAME ==
1463 // == BWDREF_FRAME ==
1464 // == ALTREF2_FRAME ==
1465 // == ALTREF_FRAME ==
1466
1467 // Set up the reference frames in the anti-chronological order.
1468 static const MV_REFERENCE_FRAME ref_frame_list[INTER_REFS_PER_FRAME - 2] = {
1469 LAST2_FRAME, LAST3_FRAME, BWDREF_FRAME, ALTREF2_FRAME, ALTREF_FRAME
1470 };
1471
1472 int ref_idx;
1473 for (ref_idx = 0; ref_idx < (INTER_REFS_PER_FRAME - 2); ref_idx++) {
1474 const MV_REFERENCE_FRAME ref_frame = ref_frame_list[ref_idx];
1475
1476 if (ref_flag_list[ref_frame - LAST_FRAME] == 1) continue;
1477
1478 while (fwd_start_idx <= fwd_end_idx &&
1479 (ref_frame_info[fwd_end_idx].map_idx == lst_map_idx ||
1480 ref_frame_info[fwd_end_idx].map_idx == gld_map_idx)) {
1481 fwd_end_idx--;
1482 }
1483 if (fwd_start_idx > fwd_end_idx) break;
1484
1485 set_ref_frame_info(remapped_ref_idx, ref_frame - LAST_FRAME,
1486 &ref_frame_info[fwd_end_idx]);
1487 ref_flag_list[ref_frame - LAST_FRAME] = 1;
1488
1489 fwd_end_idx--;
1490 }
1491
1492 // Assign all the remaining frame(s), if any, to the earliest reference
1493 // frame.
1494 for (; ref_idx < (INTER_REFS_PER_FRAME - 2); ref_idx++) {
1495 const MV_REFERENCE_FRAME ref_frame = ref_frame_list[ref_idx];
1496 if (ref_flag_list[ref_frame - LAST_FRAME] == 1) continue;
1497 set_ref_frame_info(remapped_ref_idx, ref_frame - LAST_FRAME,
1498 &ref_frame_info[fwd_start_idx]);
1499 ref_flag_list[ref_frame - LAST_FRAME] = 1;
1500 }
1501
1502 for (int i = 0; i < INTER_REFS_PER_FRAME; i++) {
1503 assert(ref_flag_list[i] == 1);
1504 }
1505 }
1506