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