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->sb_type;
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->sb_type;
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 // The left hand of two vertical rectangles always has a top right (as the
289 // block above will have been decoded)
290 if (xd->width < xd->height)
291 if (!xd->is_sec_rect) has_tr = 1;
292
293 // The bottom of two horizontal rectangles never has a top right (as the block
294 // to the right won't have been decoded)
295 if (xd->width > xd->height)
296 if (xd->is_sec_rect) has_tr = 0;
297
298 // The bottom left square of a Vertical A (in the old format) does
299 // not have a top right as it is decoded before the right hand
300 // rectangle of the partition
301 if (xd->mi[0]->partition == PARTITION_VERT_A) {
302 if (xd->width == xd->height)
303 if (mask_row & bs) has_tr = 0;
304 }
305
306 return has_tr;
307 }
308
check_sb_border(const int mi_row,const int mi_col,const int row_offset,const int col_offset)309 static int check_sb_border(const int mi_row, const int mi_col,
310 const int row_offset, const int col_offset) {
311 const int sb_mi_size = mi_size_wide[BLOCK_64X64];
312 const int row = mi_row & (sb_mi_size - 1);
313 const int col = mi_col & (sb_mi_size - 1);
314
315 if (row + row_offset < 0 || row + row_offset >= sb_mi_size ||
316 col + col_offset < 0 || col + col_offset >= sb_mi_size)
317 return 0;
318
319 return 1;
320 }
321
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)322 static int add_tpl_ref_mv(const AV1_COMMON *cm, const MACROBLOCKD *xd,
323 int mi_row, int mi_col, MV_REFERENCE_FRAME ref_frame,
324 int blk_row, int blk_col, int_mv *gm_mv_candidates,
325 uint8_t *const refmv_count,
326 CANDIDATE_MV ref_mv_stack[MAX_REF_MV_STACK_SIZE],
327 uint16_t ref_mv_weight[MAX_REF_MV_STACK_SIZE],
328 int16_t *mode_context) {
329 POSITION mi_pos;
330 mi_pos.row = (mi_row & 0x01) ? blk_row : blk_row + 1;
331 mi_pos.col = (mi_col & 0x01) ? blk_col : blk_col + 1;
332
333 if (!is_inside(&xd->tile, mi_col, mi_row, &mi_pos)) return 0;
334
335 const TPL_MV_REF *prev_frame_mvs =
336 cm->tpl_mvs +
337 ((mi_row + mi_pos.row) >> 1) * (cm->mi_params.mi_stride >> 1) +
338 ((mi_col + mi_pos.col) >> 1);
339 if (prev_frame_mvs->mfmv0.as_int == INVALID_MV) return 0;
340
341 MV_REFERENCE_FRAME rf[2];
342 av1_set_ref_frame(rf, ref_frame);
343
344 const uint16_t weight_unit = 1; // mi_size_wide[BLOCK_8X8];
345 const int cur_frame_index = cm->cur_frame->order_hint;
346 const RefCntBuffer *const buf_0 = get_ref_frame_buf(cm, rf[0]);
347 const int frame0_index = buf_0->order_hint;
348 const int cur_offset_0 = get_relative_dist(&cm->seq_params.order_hint_info,
349 cur_frame_index, frame0_index);
350 int idx;
351 const int allow_high_precision_mv = cm->features.allow_high_precision_mv;
352 const int force_integer_mv = cm->features.cur_frame_force_integer_mv;
353
354 int_mv this_refmv;
355 get_mv_projection(&this_refmv.as_mv, prev_frame_mvs->mfmv0.as_mv,
356 cur_offset_0, prev_frame_mvs->ref_frame_offset);
357 lower_mv_precision(&this_refmv.as_mv, allow_high_precision_mv,
358 force_integer_mv);
359
360 if (rf[1] == NONE_FRAME) {
361 if (blk_row == 0 && blk_col == 0) {
362 if (abs(this_refmv.as_mv.row - gm_mv_candidates[0].as_mv.row) >= 16 ||
363 abs(this_refmv.as_mv.col - gm_mv_candidates[0].as_mv.col) >= 16)
364 mode_context[ref_frame] |= (1 << GLOBALMV_OFFSET);
365 }
366
367 for (idx = 0; idx < *refmv_count; ++idx)
368 if (this_refmv.as_int == ref_mv_stack[idx].this_mv.as_int) break;
369
370 if (idx < *refmv_count) ref_mv_weight[idx] += 2 * weight_unit;
371
372 if (idx == *refmv_count && *refmv_count < MAX_REF_MV_STACK_SIZE) {
373 ref_mv_stack[idx].this_mv.as_int = this_refmv.as_int;
374 ref_mv_weight[idx] = 2 * weight_unit;
375 ++(*refmv_count);
376 }
377 } else {
378 // Process compound inter mode
379 const RefCntBuffer *const buf_1 = get_ref_frame_buf(cm, rf[1]);
380 const int frame1_index = buf_1->order_hint;
381 const int cur_offset_1 = get_relative_dist(&cm->seq_params.order_hint_info,
382 cur_frame_index, frame1_index);
383 int_mv comp_refmv;
384 get_mv_projection(&comp_refmv.as_mv, prev_frame_mvs->mfmv0.as_mv,
385 cur_offset_1, prev_frame_mvs->ref_frame_offset);
386 lower_mv_precision(&comp_refmv.as_mv, allow_high_precision_mv,
387 force_integer_mv);
388
389 if (blk_row == 0 && blk_col == 0) {
390 if (abs(this_refmv.as_mv.row - gm_mv_candidates[0].as_mv.row) >= 16 ||
391 abs(this_refmv.as_mv.col - gm_mv_candidates[0].as_mv.col) >= 16 ||
392 abs(comp_refmv.as_mv.row - gm_mv_candidates[1].as_mv.row) >= 16 ||
393 abs(comp_refmv.as_mv.col - gm_mv_candidates[1].as_mv.col) >= 16)
394 mode_context[ref_frame] |= (1 << GLOBALMV_OFFSET);
395 }
396
397 for (idx = 0; idx < *refmv_count; ++idx) {
398 if (this_refmv.as_int == ref_mv_stack[idx].this_mv.as_int &&
399 comp_refmv.as_int == ref_mv_stack[idx].comp_mv.as_int)
400 break;
401 }
402
403 if (idx < *refmv_count) ref_mv_weight[idx] += 2 * weight_unit;
404
405 if (idx == *refmv_count && *refmv_count < MAX_REF_MV_STACK_SIZE) {
406 ref_mv_stack[idx].this_mv.as_int = this_refmv.as_int;
407 ref_mv_stack[idx].comp_mv.as_int = comp_refmv.as_int;
408 ref_mv_weight[idx] = 2 * weight_unit;
409 ++(*refmv_count);
410 }
411 }
412
413 return 1;
414 }
415
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])416 static AOM_INLINE void process_compound_ref_mv_candidate(
417 const MB_MODE_INFO *const candidate, const AV1_COMMON *const cm,
418 const MV_REFERENCE_FRAME *const rf, int_mv ref_id[2][2],
419 int ref_id_count[2], int_mv ref_diff[2][2], int ref_diff_count[2]) {
420 for (int rf_idx = 0; rf_idx < 2; ++rf_idx) {
421 MV_REFERENCE_FRAME can_rf = candidate->ref_frame[rf_idx];
422
423 for (int cmp_idx = 0; cmp_idx < 2; ++cmp_idx) {
424 if (can_rf == rf[cmp_idx] && ref_id_count[cmp_idx] < 2) {
425 ref_id[cmp_idx][ref_id_count[cmp_idx]] = candidate->mv[rf_idx];
426 ++ref_id_count[cmp_idx];
427 } else if (can_rf > INTRA_FRAME && ref_diff_count[cmp_idx] < 2) {
428 int_mv this_mv = candidate->mv[rf_idx];
429 if (cm->ref_frame_sign_bias[can_rf] !=
430 cm->ref_frame_sign_bias[rf[cmp_idx]]) {
431 this_mv.as_mv.row = -this_mv.as_mv.row;
432 this_mv.as_mv.col = -this_mv.as_mv.col;
433 }
434 ref_diff[cmp_idx][ref_diff_count[cmp_idx]] = this_mv;
435 ++ref_diff_count[cmp_idx];
436 }
437 }
438 }
439 }
440
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])441 static AOM_INLINE void process_single_ref_mv_candidate(
442 const MB_MODE_INFO *const candidate, const AV1_COMMON *const cm,
443 MV_REFERENCE_FRAME ref_frame, uint8_t *const refmv_count,
444 CANDIDATE_MV ref_mv_stack[MAX_REF_MV_STACK_SIZE],
445 uint16_t ref_mv_weight[MAX_REF_MV_STACK_SIZE]) {
446 for (int rf_idx = 0; rf_idx < 2; ++rf_idx) {
447 if (candidate->ref_frame[rf_idx] > INTRA_FRAME) {
448 int_mv this_mv = candidate->mv[rf_idx];
449 if (cm->ref_frame_sign_bias[candidate->ref_frame[rf_idx]] !=
450 cm->ref_frame_sign_bias[ref_frame]) {
451 this_mv.as_mv.row = -this_mv.as_mv.row;
452 this_mv.as_mv.col = -this_mv.as_mv.col;
453 }
454 int stack_idx;
455 for (stack_idx = 0; stack_idx < *refmv_count; ++stack_idx) {
456 const int_mv stack_mv = ref_mv_stack[stack_idx].this_mv;
457 if (this_mv.as_int == stack_mv.as_int) break;
458 }
459
460 if (stack_idx == *refmv_count) {
461 ref_mv_stack[stack_idx].this_mv = this_mv;
462
463 // TODO(jingning): Set an arbitrary small number here. The weight
464 // doesn't matter as long as it is properly initialized.
465 ref_mv_weight[stack_idx] = 2;
466 ++(*refmv_count);
467 }
468 }
469 }
470 }
471
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)472 static AOM_INLINE void setup_ref_mv_list(
473 const AV1_COMMON *cm, const MACROBLOCKD *xd, MV_REFERENCE_FRAME ref_frame,
474 uint8_t *const refmv_count,
475 CANDIDATE_MV ref_mv_stack[MAX_REF_MV_STACK_SIZE],
476 uint16_t ref_mv_weight[MAX_REF_MV_STACK_SIZE],
477 int_mv mv_ref_list[MAX_MV_REF_CANDIDATES], int_mv *gm_mv_candidates,
478 int mi_row, int mi_col, int16_t *mode_context) {
479 const int bs = AOMMAX(xd->width, xd->height);
480 const int has_tr = has_top_right(cm, xd, mi_row, mi_col, bs);
481 MV_REFERENCE_FRAME rf[2];
482
483 const TileInfo *const tile = &xd->tile;
484 int max_row_offset = 0, max_col_offset = 0;
485 const int row_adj = (xd->height < mi_size_high[BLOCK_8X8]) && (mi_row & 0x01);
486 const int col_adj = (xd->width < mi_size_wide[BLOCK_8X8]) && (mi_col & 0x01);
487 int processed_rows = 0;
488 int processed_cols = 0;
489
490 av1_set_ref_frame(rf, ref_frame);
491 mode_context[ref_frame] = 0;
492 *refmv_count = 0;
493
494 // Find valid maximum row/col offset.
495 if (xd->up_available) {
496 max_row_offset = -(MVREF_ROW_COLS << 1) + row_adj;
497
498 if (xd->height < mi_size_high[BLOCK_8X8])
499 max_row_offset = -(2 << 1) + row_adj;
500
501 max_row_offset = find_valid_row_offset(tile, mi_row, max_row_offset);
502 }
503
504 if (xd->left_available) {
505 max_col_offset = -(MVREF_ROW_COLS << 1) + col_adj;
506
507 if (xd->width < mi_size_wide[BLOCK_8X8])
508 max_col_offset = -(2 << 1) + col_adj;
509
510 max_col_offset = find_valid_col_offset(tile, mi_col, max_col_offset);
511 }
512
513 uint8_t col_match_count = 0;
514 uint8_t row_match_count = 0;
515 uint8_t newmv_count = 0;
516
517 // Scan the first above row mode info. row_offset = -1;
518 if (abs(max_row_offset) >= 1)
519 scan_row_mbmi(cm, xd, mi_col, rf, -1, ref_mv_stack, ref_mv_weight,
520 refmv_count, &row_match_count, &newmv_count, gm_mv_candidates,
521 max_row_offset, &processed_rows);
522 // Scan the first left column mode info. col_offset = -1;
523 if (abs(max_col_offset) >= 1)
524 scan_col_mbmi(cm, xd, mi_row, rf, -1, ref_mv_stack, ref_mv_weight,
525 refmv_count, &col_match_count, &newmv_count, gm_mv_candidates,
526 max_col_offset, &processed_cols);
527 // Check top-right boundary
528 if (has_tr)
529 scan_blk_mbmi(cm, xd, mi_row, mi_col, rf, -1, xd->width, ref_mv_stack,
530 ref_mv_weight, &row_match_count, &newmv_count,
531 gm_mv_candidates, refmv_count);
532
533 const uint8_t nearest_match = (row_match_count > 0) + (col_match_count > 0);
534 const uint8_t nearest_refmv_count = *refmv_count;
535
536 // TODO(yunqing): for comp_search, do it for all 3 cases.
537 for (int idx = 0; idx < nearest_refmv_count; ++idx)
538 ref_mv_weight[idx] += REF_CAT_LEVEL;
539
540 if (cm->features.allow_ref_frame_mvs) {
541 int is_available = 0;
542 const int voffset = AOMMAX(mi_size_high[BLOCK_8X8], xd->height);
543 const int hoffset = AOMMAX(mi_size_wide[BLOCK_8X8], xd->width);
544 const int blk_row_end = AOMMIN(xd->height, mi_size_high[BLOCK_64X64]);
545 const int blk_col_end = AOMMIN(xd->width, mi_size_wide[BLOCK_64X64]);
546
547 const int tpl_sample_pos[3][2] = {
548 { voffset, -2 },
549 { voffset, hoffset },
550 { voffset - 2, hoffset },
551 };
552 const int allow_extension = (xd->height >= mi_size_high[BLOCK_8X8]) &&
553 (xd->height < mi_size_high[BLOCK_64X64]) &&
554 (xd->width >= mi_size_wide[BLOCK_8X8]) &&
555 (xd->width < mi_size_wide[BLOCK_64X64]);
556
557 const int step_h = (xd->height >= mi_size_high[BLOCK_64X64])
558 ? mi_size_high[BLOCK_16X16]
559 : mi_size_high[BLOCK_8X8];
560 const int step_w = (xd->width >= mi_size_wide[BLOCK_64X64])
561 ? mi_size_wide[BLOCK_16X16]
562 : mi_size_wide[BLOCK_8X8];
563
564 for (int blk_row = 0; blk_row < blk_row_end; blk_row += step_h) {
565 for (int blk_col = 0; blk_col < blk_col_end; blk_col += step_w) {
566 int ret = add_tpl_ref_mv(cm, xd, mi_row, mi_col, ref_frame, blk_row,
567 blk_col, gm_mv_candidates, refmv_count,
568 ref_mv_stack, ref_mv_weight, mode_context);
569 if (blk_row == 0 && blk_col == 0) is_available = ret;
570 }
571 }
572
573 if (is_available == 0) mode_context[ref_frame] |= (1 << GLOBALMV_OFFSET);
574
575 for (int i = 0; i < 3 && allow_extension; ++i) {
576 const int blk_row = tpl_sample_pos[i][0];
577 const int blk_col = tpl_sample_pos[i][1];
578
579 if (!check_sb_border(mi_row, mi_col, blk_row, blk_col)) continue;
580 add_tpl_ref_mv(cm, xd, mi_row, mi_col, ref_frame, blk_row, blk_col,
581 gm_mv_candidates, refmv_count, ref_mv_stack, ref_mv_weight,
582 mode_context);
583 }
584 }
585
586 uint8_t dummy_newmv_count = 0;
587
588 // Scan the second outer area.
589 scan_blk_mbmi(cm, xd, mi_row, mi_col, rf, -1, -1, ref_mv_stack, ref_mv_weight,
590 &row_match_count, &dummy_newmv_count, gm_mv_candidates,
591 refmv_count);
592
593 for (int idx = 2; idx <= MVREF_ROW_COLS; ++idx) {
594 const int row_offset = -(idx << 1) + 1 + row_adj;
595 const int col_offset = -(idx << 1) + 1 + col_adj;
596
597 if (abs(row_offset) <= abs(max_row_offset) &&
598 abs(row_offset) > processed_rows)
599 scan_row_mbmi(cm, xd, mi_col, rf, row_offset, ref_mv_stack, ref_mv_weight,
600 refmv_count, &row_match_count, &dummy_newmv_count,
601 gm_mv_candidates, max_row_offset, &processed_rows);
602
603 if (abs(col_offset) <= abs(max_col_offset) &&
604 abs(col_offset) > processed_cols)
605 scan_col_mbmi(cm, xd, mi_row, rf, col_offset, ref_mv_stack, ref_mv_weight,
606 refmv_count, &col_match_count, &dummy_newmv_count,
607 gm_mv_candidates, max_col_offset, &processed_cols);
608 }
609
610 const uint8_t ref_match_count = (row_match_count > 0) + (col_match_count > 0);
611
612 switch (nearest_match) {
613 case 0:
614 if (ref_match_count >= 1) mode_context[ref_frame] |= 1;
615 if (ref_match_count == 1)
616 mode_context[ref_frame] |= (1 << REFMV_OFFSET);
617 else if (ref_match_count >= 2)
618 mode_context[ref_frame] |= (2 << REFMV_OFFSET);
619 break;
620 case 1:
621 mode_context[ref_frame] |= (newmv_count > 0) ? 2 : 3;
622 if (ref_match_count == 1)
623 mode_context[ref_frame] |= (3 << REFMV_OFFSET);
624 else if (ref_match_count >= 2)
625 mode_context[ref_frame] |= (4 << REFMV_OFFSET);
626 break;
627 case 2:
628 default:
629 if (newmv_count >= 1)
630 mode_context[ref_frame] |= 4;
631 else
632 mode_context[ref_frame] |= 5;
633
634 mode_context[ref_frame] |= (5 << REFMV_OFFSET);
635 break;
636 }
637
638 // Rank the likelihood and assign nearest and near mvs.
639 int len = nearest_refmv_count;
640 while (len > 0) {
641 int nr_len = 0;
642 for (int idx = 1; idx < len; ++idx) {
643 if (ref_mv_weight[idx - 1] < ref_mv_weight[idx]) {
644 const CANDIDATE_MV tmp_mv = ref_mv_stack[idx - 1];
645 const uint16_t tmp_ref_mv_weight = ref_mv_weight[idx - 1];
646 ref_mv_stack[idx - 1] = ref_mv_stack[idx];
647 ref_mv_stack[idx] = tmp_mv;
648 ref_mv_weight[idx - 1] = ref_mv_weight[idx];
649 ref_mv_weight[idx] = tmp_ref_mv_weight;
650 nr_len = idx;
651 }
652 }
653 len = nr_len;
654 }
655
656 len = *refmv_count;
657 while (len > nearest_refmv_count) {
658 int nr_len = nearest_refmv_count;
659 for (int idx = nearest_refmv_count + 1; idx < len; ++idx) {
660 if (ref_mv_weight[idx - 1] < ref_mv_weight[idx]) {
661 const CANDIDATE_MV tmp_mv = ref_mv_stack[idx - 1];
662 const uint16_t tmp_ref_mv_weight = ref_mv_weight[idx - 1];
663 ref_mv_stack[idx - 1] = ref_mv_stack[idx];
664 ref_mv_stack[idx] = tmp_mv;
665 ref_mv_weight[idx - 1] = ref_mv_weight[idx];
666 ref_mv_weight[idx] = tmp_ref_mv_weight;
667 nr_len = idx;
668 }
669 }
670 len = nr_len;
671 }
672
673 int mi_width = AOMMIN(mi_size_wide[BLOCK_64X64], xd->width);
674 mi_width = AOMMIN(mi_width, cm->mi_params.mi_cols - mi_col);
675 int mi_height = AOMMIN(mi_size_high[BLOCK_64X64], xd->height);
676 mi_height = AOMMIN(mi_height, cm->mi_params.mi_rows - mi_row);
677 const int mi_size = AOMMIN(mi_width, mi_height);
678 if (rf[1] > NONE_FRAME) {
679 // TODO(jingning, yunqing): Refactor and consolidate the compound and
680 // single reference frame modes. Reduce unnecessary redundancy.
681 if (*refmv_count < MAX_MV_REF_CANDIDATES) {
682 int_mv ref_id[2][2], ref_diff[2][2];
683 int ref_id_count[2] = { 0 }, ref_diff_count[2] = { 0 };
684
685 for (int idx = 0; abs(max_row_offset) >= 1 && idx < mi_size;) {
686 const MB_MODE_INFO *const candidate = xd->mi[-xd->mi_stride + idx];
687 process_compound_ref_mv_candidate(
688 candidate, cm, rf, ref_id, ref_id_count, ref_diff, ref_diff_count);
689 idx += mi_size_wide[candidate->sb_type];
690 }
691
692 for (int idx = 0; abs(max_col_offset) >= 1 && idx < mi_size;) {
693 const MB_MODE_INFO *const candidate = xd->mi[idx * xd->mi_stride - 1];
694 process_compound_ref_mv_candidate(
695 candidate, cm, rf, ref_id, ref_id_count, ref_diff, ref_diff_count);
696 idx += mi_size_high[candidate->sb_type];
697 }
698
699 // Build up the compound mv predictor
700 int_mv comp_list[MAX_MV_REF_CANDIDATES][2];
701
702 for (int idx = 0; idx < 2; ++idx) {
703 int comp_idx = 0;
704 for (int list_idx = 0;
705 list_idx < ref_id_count[idx] && comp_idx < MAX_MV_REF_CANDIDATES;
706 ++list_idx, ++comp_idx)
707 comp_list[comp_idx][idx] = ref_id[idx][list_idx];
708 for (int list_idx = 0;
709 list_idx < ref_diff_count[idx] && comp_idx < MAX_MV_REF_CANDIDATES;
710 ++list_idx, ++comp_idx)
711 comp_list[comp_idx][idx] = ref_diff[idx][list_idx];
712 for (; comp_idx < MAX_MV_REF_CANDIDATES; ++comp_idx)
713 comp_list[comp_idx][idx] = gm_mv_candidates[idx];
714 }
715
716 if (*refmv_count) {
717 assert(*refmv_count == 1);
718 if (comp_list[0][0].as_int == ref_mv_stack[0].this_mv.as_int &&
719 comp_list[0][1].as_int == ref_mv_stack[0].comp_mv.as_int) {
720 ref_mv_stack[*refmv_count].this_mv = comp_list[1][0];
721 ref_mv_stack[*refmv_count].comp_mv = comp_list[1][1];
722 } else {
723 ref_mv_stack[*refmv_count].this_mv = comp_list[0][0];
724 ref_mv_stack[*refmv_count].comp_mv = comp_list[0][1];
725 }
726 ref_mv_weight[*refmv_count] = 2;
727 ++*refmv_count;
728 } else {
729 for (int idx = 0; idx < MAX_MV_REF_CANDIDATES; ++idx) {
730 ref_mv_stack[*refmv_count].this_mv = comp_list[idx][0];
731 ref_mv_stack[*refmv_count].comp_mv = comp_list[idx][1];
732 ref_mv_weight[*refmv_count] = 2;
733 ++*refmv_count;
734 }
735 }
736 }
737
738 assert(*refmv_count >= 2);
739
740 for (int idx = 0; idx < *refmv_count; ++idx) {
741 clamp_mv_ref(&ref_mv_stack[idx].this_mv.as_mv, xd->width << MI_SIZE_LOG2,
742 xd->height << MI_SIZE_LOG2, xd);
743 clamp_mv_ref(&ref_mv_stack[idx].comp_mv.as_mv, xd->width << MI_SIZE_LOG2,
744 xd->height << MI_SIZE_LOG2, xd);
745 }
746 } else {
747 // Handle single reference frame extension
748 for (int idx = 0; abs(max_row_offset) >= 1 && idx < mi_size &&
749 *refmv_count < MAX_MV_REF_CANDIDATES;) {
750 const MB_MODE_INFO *const candidate = xd->mi[-xd->mi_stride + idx];
751 process_single_ref_mv_candidate(candidate, cm, ref_frame, refmv_count,
752 ref_mv_stack, ref_mv_weight);
753 idx += mi_size_wide[candidate->sb_type];
754 }
755
756 for (int idx = 0; abs(max_col_offset) >= 1 && idx < mi_size &&
757 *refmv_count < MAX_MV_REF_CANDIDATES;) {
758 const MB_MODE_INFO *const candidate = xd->mi[idx * xd->mi_stride - 1];
759 process_single_ref_mv_candidate(candidate, cm, ref_frame, refmv_count,
760 ref_mv_stack, ref_mv_weight);
761 idx += mi_size_high[candidate->sb_type];
762 }
763
764 for (int idx = 0; idx < *refmv_count; ++idx) {
765 clamp_mv_ref(&ref_mv_stack[idx].this_mv.as_mv, xd->width << MI_SIZE_LOG2,
766 xd->height << MI_SIZE_LOG2, xd);
767 }
768
769 if (mv_ref_list != NULL) {
770 for (int idx = *refmv_count; idx < MAX_MV_REF_CANDIDATES; ++idx)
771 mv_ref_list[idx].as_int = gm_mv_candidates[0].as_int;
772
773 for (int idx = 0; idx < AOMMIN(MAX_MV_REF_CANDIDATES, *refmv_count);
774 ++idx) {
775 mv_ref_list[idx].as_int = ref_mv_stack[idx].this_mv.as_int;
776 }
777 }
778 }
779 }
780
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)781 void av1_find_mv_refs(const AV1_COMMON *cm, const MACROBLOCKD *xd,
782 MB_MODE_INFO *mi, MV_REFERENCE_FRAME ref_frame,
783 uint8_t ref_mv_count[MODE_CTX_REF_FRAMES],
784 CANDIDATE_MV ref_mv_stack[][MAX_REF_MV_STACK_SIZE],
785 uint16_t ref_mv_weight[][MAX_REF_MV_STACK_SIZE],
786 int_mv mv_ref_list[][MAX_MV_REF_CANDIDATES],
787 int_mv *global_mvs, int16_t *mode_context) {
788 const int mi_row = xd->mi_row;
789 const int mi_col = xd->mi_col;
790 int_mv gm_mv[2];
791
792 if (ref_frame == INTRA_FRAME) {
793 gm_mv[0].as_int = gm_mv[1].as_int = 0;
794 if (global_mvs != NULL) {
795 global_mvs[ref_frame].as_int = INVALID_MV;
796 }
797 } else {
798 const BLOCK_SIZE bsize = mi->sb_type;
799 const int allow_high_precision_mv = cm->features.allow_high_precision_mv;
800 const int force_integer_mv = cm->features.cur_frame_force_integer_mv;
801 if (ref_frame < REF_FRAMES) {
802 gm_mv[0] = gm_get_motion_vector(&cm->global_motion[ref_frame],
803 allow_high_precision_mv, bsize, mi_col,
804 mi_row, force_integer_mv);
805 gm_mv[1].as_int = 0;
806 if (global_mvs != NULL) global_mvs[ref_frame] = gm_mv[0];
807 } else {
808 MV_REFERENCE_FRAME rf[2];
809 av1_set_ref_frame(rf, ref_frame);
810 gm_mv[0] = gm_get_motion_vector(&cm->global_motion[rf[0]],
811 allow_high_precision_mv, bsize, mi_col,
812 mi_row, force_integer_mv);
813 gm_mv[1] = gm_get_motion_vector(&cm->global_motion[rf[1]],
814 allow_high_precision_mv, bsize, mi_col,
815 mi_row, force_integer_mv);
816 }
817 }
818
819 setup_ref_mv_list(cm, xd, ref_frame, &ref_mv_count[ref_frame],
820 ref_mv_stack[ref_frame], ref_mv_weight[ref_frame],
821 mv_ref_list ? mv_ref_list[ref_frame] : NULL, gm_mv, mi_row,
822 mi_col, mode_context);
823 }
824
av1_find_best_ref_mvs(int allow_hp,int_mv * mvlist,int_mv * nearest_mv,int_mv * near_mv,int is_integer)825 void av1_find_best_ref_mvs(int allow_hp, int_mv *mvlist, int_mv *nearest_mv,
826 int_mv *near_mv, int is_integer) {
827 int i;
828 // Make sure all the candidates are properly clamped etc
829 for (i = 0; i < MAX_MV_REF_CANDIDATES; ++i) {
830 lower_mv_precision(&mvlist[i].as_mv, allow_hp, is_integer);
831 }
832 *nearest_mv = mvlist[0];
833 *near_mv = mvlist[1];
834 }
835
av1_setup_frame_buf_refs(AV1_COMMON * cm)836 void av1_setup_frame_buf_refs(AV1_COMMON *cm) {
837 cm->cur_frame->order_hint = cm->current_frame.order_hint;
838 cm->cur_frame->display_order_hint = cm->current_frame.display_order_hint;
839
840 MV_REFERENCE_FRAME ref_frame;
841 for (ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ++ref_frame) {
842 const RefCntBuffer *const buf = get_ref_frame_buf(cm, ref_frame);
843 if (buf != NULL) {
844 cm->cur_frame->ref_order_hints[ref_frame - LAST_FRAME] = buf->order_hint;
845 cm->cur_frame->ref_display_order_hint[ref_frame - LAST_FRAME] =
846 buf->display_order_hint;
847 }
848 }
849 }
850
av1_setup_frame_sign_bias(AV1_COMMON * cm)851 void av1_setup_frame_sign_bias(AV1_COMMON *cm) {
852 MV_REFERENCE_FRAME ref_frame;
853 for (ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ++ref_frame) {
854 const RefCntBuffer *const buf = get_ref_frame_buf(cm, ref_frame);
855 if (cm->seq_params.order_hint_info.enable_order_hint && buf != NULL) {
856 const int ref_order_hint = buf->order_hint;
857 cm->ref_frame_sign_bias[ref_frame] =
858 (get_relative_dist(&cm->seq_params.order_hint_info, ref_order_hint,
859 (int)cm->current_frame.order_hint) <= 0)
860 ? 0
861 : 1;
862 } else {
863 cm->ref_frame_sign_bias[ref_frame] = 0;
864 }
865 }
866 }
867
868 #define MAX_OFFSET_WIDTH 64
869 #define MAX_OFFSET_HEIGHT 0
870
get_block_position(AV1_COMMON * cm,int * mi_r,int * mi_c,int blk_row,int blk_col,MV mv,int sign_bias)871 static int get_block_position(AV1_COMMON *cm, int *mi_r, int *mi_c, int blk_row,
872 int blk_col, MV mv, int sign_bias) {
873 const int base_blk_row = (blk_row >> 3) << 3;
874 const int base_blk_col = (blk_col >> 3) << 3;
875
876 const int row_offset = (mv.row >= 0) ? (mv.row >> (4 + MI_SIZE_LOG2))
877 : -((-mv.row) >> (4 + MI_SIZE_LOG2));
878
879 const int col_offset = (mv.col >= 0) ? (mv.col >> (4 + MI_SIZE_LOG2))
880 : -((-mv.col) >> (4 + MI_SIZE_LOG2));
881
882 const int row =
883 (sign_bias == 1) ? blk_row - row_offset : blk_row + row_offset;
884 const int col =
885 (sign_bias == 1) ? blk_col - col_offset : blk_col + col_offset;
886
887 if (row < 0 || row >= (cm->mi_params.mi_rows >> 1) || col < 0 ||
888 col >= (cm->mi_params.mi_cols >> 1))
889 return 0;
890
891 if (row < base_blk_row - (MAX_OFFSET_HEIGHT >> 3) ||
892 row >= base_blk_row + 8 + (MAX_OFFSET_HEIGHT >> 3) ||
893 col < base_blk_col - (MAX_OFFSET_WIDTH >> 3) ||
894 col >= base_blk_col + 8 + (MAX_OFFSET_WIDTH >> 3))
895 return 0;
896
897 *mi_r = row;
898 *mi_c = col;
899
900 return 1;
901 }
902
903 // Note: motion_filed_projection finds motion vectors of current frame's
904 // reference frame, and projects them to current frame. To make it clear,
905 // let's call current frame's reference frame as start frame.
906 // Call Start frame's reference frames as reference frames.
907 // Call ref_offset as frame distances between start frame and its reference
908 // frames.
motion_field_projection(AV1_COMMON * cm,MV_REFERENCE_FRAME start_frame,int dir)909 static int motion_field_projection(AV1_COMMON *cm,
910 MV_REFERENCE_FRAME start_frame, int dir) {
911 TPL_MV_REF *tpl_mvs_base = cm->tpl_mvs;
912 int ref_offset[REF_FRAMES] = { 0 };
913
914 const RefCntBuffer *const start_frame_buf =
915 get_ref_frame_buf(cm, start_frame);
916 if (start_frame_buf == NULL) return 0;
917
918 if (start_frame_buf->frame_type == KEY_FRAME ||
919 start_frame_buf->frame_type == INTRA_ONLY_FRAME)
920 return 0;
921
922 if (start_frame_buf->mi_rows != cm->mi_params.mi_rows ||
923 start_frame_buf->mi_cols != cm->mi_params.mi_cols)
924 return 0;
925
926 const int start_frame_order_hint = start_frame_buf->order_hint;
927 const unsigned int *const ref_order_hints =
928 &start_frame_buf->ref_order_hints[0];
929 const int cur_order_hint = cm->cur_frame->order_hint;
930 int start_to_current_frame_offset = get_relative_dist(
931 &cm->seq_params.order_hint_info, start_frame_order_hint, cur_order_hint);
932
933 for (MV_REFERENCE_FRAME rf = LAST_FRAME; rf <= INTER_REFS_PER_FRAME; ++rf) {
934 ref_offset[rf] = get_relative_dist(&cm->seq_params.order_hint_info,
935 start_frame_order_hint,
936 ref_order_hints[rf - LAST_FRAME]);
937 }
938
939 if (dir == 2) start_to_current_frame_offset = -start_to_current_frame_offset;
940
941 MV_REF *mv_ref_base = start_frame_buf->mvs;
942 const int mvs_rows = (cm->mi_params.mi_rows + 1) >> 1;
943 const int mvs_cols = (cm->mi_params.mi_cols + 1) >> 1;
944
945 for (int blk_row = 0; blk_row < mvs_rows; ++blk_row) {
946 for (int blk_col = 0; blk_col < mvs_cols; ++blk_col) {
947 MV_REF *mv_ref = &mv_ref_base[blk_row * mvs_cols + blk_col];
948 MV fwd_mv = mv_ref->mv.as_mv;
949
950 if (mv_ref->ref_frame > INTRA_FRAME) {
951 int_mv this_mv;
952 int mi_r, mi_c;
953 const int ref_frame_offset = ref_offset[mv_ref->ref_frame];
954
955 int pos_valid =
956 abs(ref_frame_offset) <= MAX_FRAME_DISTANCE &&
957 ref_frame_offset > 0 &&
958 abs(start_to_current_frame_offset) <= MAX_FRAME_DISTANCE;
959
960 if (pos_valid) {
961 get_mv_projection(&this_mv.as_mv, fwd_mv,
962 start_to_current_frame_offset, ref_frame_offset);
963 pos_valid = get_block_position(cm, &mi_r, &mi_c, blk_row, blk_col,
964 this_mv.as_mv, dir >> 1);
965 }
966
967 if (pos_valid) {
968 const int mi_offset = mi_r * (cm->mi_params.mi_stride >> 1) + mi_c;
969
970 tpl_mvs_base[mi_offset].mfmv0.as_mv.row = fwd_mv.row;
971 tpl_mvs_base[mi_offset].mfmv0.as_mv.col = fwd_mv.col;
972 tpl_mvs_base[mi_offset].ref_frame_offset = ref_frame_offset;
973 }
974 }
975 }
976 }
977
978 return 1;
979 }
980
av1_setup_motion_field(AV1_COMMON * cm)981 void av1_setup_motion_field(AV1_COMMON *cm) {
982 const OrderHintInfo *const order_hint_info = &cm->seq_params.order_hint_info;
983
984 memset(cm->ref_frame_side, 0, sizeof(cm->ref_frame_side));
985 if (!order_hint_info->enable_order_hint) return;
986
987 TPL_MV_REF *tpl_mvs_base = cm->tpl_mvs;
988 int size = ((cm->mi_params.mi_rows + MAX_MIB_SIZE) >> 1) *
989 (cm->mi_params.mi_stride >> 1);
990 for (int idx = 0; idx < size; ++idx) {
991 tpl_mvs_base[idx].mfmv0.as_int = INVALID_MV;
992 tpl_mvs_base[idx].ref_frame_offset = 0;
993 }
994
995 const int cur_order_hint = cm->cur_frame->order_hint;
996
997 const RefCntBuffer *ref_buf[INTER_REFS_PER_FRAME];
998 int ref_order_hint[INTER_REFS_PER_FRAME];
999
1000 for (int ref_frame = LAST_FRAME; ref_frame <= ALTREF_FRAME; ref_frame++) {
1001 const int ref_idx = ref_frame - LAST_FRAME;
1002 const RefCntBuffer *const buf = get_ref_frame_buf(cm, ref_frame);
1003 int order_hint = 0;
1004
1005 if (buf != NULL) order_hint = buf->order_hint;
1006
1007 ref_buf[ref_idx] = buf;
1008 ref_order_hint[ref_idx] = order_hint;
1009
1010 if (get_relative_dist(order_hint_info, order_hint, cur_order_hint) > 0)
1011 cm->ref_frame_side[ref_frame] = 1;
1012 else if (order_hint == cur_order_hint)
1013 cm->ref_frame_side[ref_frame] = -1;
1014 }
1015
1016 int ref_stamp = MFMV_STACK_SIZE - 1;
1017
1018 if (ref_buf[LAST_FRAME - LAST_FRAME] != NULL) {
1019 const int alt_of_lst_order_hint =
1020 ref_buf[LAST_FRAME - LAST_FRAME]
1021 ->ref_order_hints[ALTREF_FRAME - LAST_FRAME];
1022
1023 const int is_lst_overlay =
1024 (alt_of_lst_order_hint == ref_order_hint[GOLDEN_FRAME - LAST_FRAME]);
1025 if (!is_lst_overlay) motion_field_projection(cm, LAST_FRAME, 2);
1026 --ref_stamp;
1027 }
1028
1029 if (get_relative_dist(order_hint_info,
1030 ref_order_hint[BWDREF_FRAME - LAST_FRAME],
1031 cur_order_hint) > 0) {
1032 if (motion_field_projection(cm, BWDREF_FRAME, 0)) --ref_stamp;
1033 }
1034
1035 if (get_relative_dist(order_hint_info,
1036 ref_order_hint[ALTREF2_FRAME - LAST_FRAME],
1037 cur_order_hint) > 0) {
1038 if (motion_field_projection(cm, ALTREF2_FRAME, 0)) --ref_stamp;
1039 }
1040
1041 if (get_relative_dist(order_hint_info,
1042 ref_order_hint[ALTREF_FRAME - LAST_FRAME],
1043 cur_order_hint) > 0 &&
1044 ref_stamp >= 0)
1045 if (motion_field_projection(cm, ALTREF_FRAME, 0)) --ref_stamp;
1046
1047 if (ref_stamp >= 0) motion_field_projection(cm, LAST2_FRAME, 2);
1048 }
1049
record_samples(const MB_MODE_INFO * mbmi,int * pts,int * pts_inref,int row_offset,int sign_r,int col_offset,int sign_c)1050 static INLINE void record_samples(const MB_MODE_INFO *mbmi, int *pts,
1051 int *pts_inref, int row_offset, int sign_r,
1052 int col_offset, int sign_c) {
1053 int bw = block_size_wide[mbmi->sb_type];
1054 int bh = block_size_high[mbmi->sb_type];
1055 int x = col_offset * MI_SIZE + sign_c * AOMMAX(bw, MI_SIZE) / 2 - 1;
1056 int y = row_offset * MI_SIZE + sign_r * AOMMAX(bh, MI_SIZE) / 2 - 1;
1057
1058 pts[0] = GET_MV_SUBPEL(x);
1059 pts[1] = GET_MV_SUBPEL(y);
1060 pts_inref[0] = GET_MV_SUBPEL(x) + mbmi->mv[0].as_mv.col;
1061 pts_inref[1] = GET_MV_SUBPEL(y) + mbmi->mv[0].as_mv.row;
1062 }
1063
1064 // Select samples according to the motion vector difference.
av1_selectSamples(MV * mv,int * pts,int * pts_inref,int len,BLOCK_SIZE bsize)1065 uint8_t av1_selectSamples(MV *mv, int *pts, int *pts_inref, int len,
1066 BLOCK_SIZE bsize) {
1067 const int bw = block_size_wide[bsize];
1068 const int bh = block_size_high[bsize];
1069 const int thresh = clamp(AOMMAX(bw, bh), 16, 112);
1070 int pts_mvd[SAMPLES_ARRAY_SIZE] = { 0 };
1071 int i, j, k, l = len;
1072 uint8_t ret = 0;
1073 assert(len <= LEAST_SQUARES_SAMPLES_MAX);
1074
1075 // Obtain the motion vector difference.
1076 for (i = 0; i < len; ++i) {
1077 pts_mvd[i] = abs(pts_inref[2 * i] - pts[2 * i] - mv->col) +
1078 abs(pts_inref[2 * i + 1] - pts[2 * i + 1] - mv->row);
1079
1080 if (pts_mvd[i] > thresh)
1081 pts_mvd[i] = -1;
1082 else
1083 ret++;
1084 }
1085
1086 // Keep at least 1 sample.
1087 if (!ret) return 1;
1088
1089 i = 0;
1090 j = l - 1;
1091 for (k = 0; k < l - ret; k++) {
1092 while (pts_mvd[i] != -1) i++;
1093 while (pts_mvd[j] == -1) j--;
1094 assert(i != j);
1095 if (i > j) break;
1096
1097 // Replace the discarded samples;
1098 pts_mvd[i] = pts_mvd[j];
1099 pts[2 * i] = pts[2 * j];
1100 pts[2 * i + 1] = pts[2 * j + 1];
1101 pts_inref[2 * i] = pts_inref[2 * j];
1102 pts_inref[2 * i + 1] = pts_inref[2 * j + 1];
1103 i++;
1104 j--;
1105 }
1106
1107 return ret;
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 int i, mi_step;
1120 uint8_t np = 0;
1121 int do_tl = 1;
1122 int do_tr = 1;
1123 const int mi_stride = xd->mi_stride;
1124 const int mi_row = xd->mi_row;
1125 const int mi_col = xd->mi_col;
1126
1127 // scan the nearest above rows
1128 if (up_available) {
1129 const int mi_row_offset = -1;
1130 const MB_MODE_INFO *mbmi = xd->mi[mi_row_offset * mi_stride];
1131 uint8_t superblock_width = mi_size_wide[mbmi->sb_type];
1132
1133 if (xd->width <= superblock_width) {
1134 // Handle "current block width <= above block width" case.
1135 const int col_offset = -mi_col % superblock_width;
1136
1137 if (col_offset < 0) do_tl = 0;
1138 if (col_offset + superblock_width > xd->width) do_tr = 0;
1139
1140 if (mbmi->ref_frame[0] == ref_frame && mbmi->ref_frame[1] == NONE_FRAME) {
1141 record_samples(mbmi, pts, pts_inref, 0, -1, col_offset, 1);
1142 pts += 2;
1143 pts_inref += 2;
1144 np++;
1145 if (np >= LEAST_SQUARES_SAMPLES_MAX) return LEAST_SQUARES_SAMPLES_MAX;
1146 }
1147 } else {
1148 // Handle "current block width > above block width" case.
1149 for (i = 0; i < AOMMIN(xd->width, cm->mi_params.mi_cols - mi_col);
1150 i += mi_step) {
1151 mbmi = xd->mi[i + mi_row_offset * mi_stride];
1152 superblock_width = mi_size_wide[mbmi->sb_type];
1153 mi_step = AOMMIN(xd->width, superblock_width);
1154
1155 if (mbmi->ref_frame[0] == ref_frame &&
1156 mbmi->ref_frame[1] == NONE_FRAME) {
1157 record_samples(mbmi, pts, pts_inref, 0, -1, i, 1);
1158 pts += 2;
1159 pts_inref += 2;
1160 np++;
1161 if (np >= LEAST_SQUARES_SAMPLES_MAX) return LEAST_SQUARES_SAMPLES_MAX;
1162 }
1163 }
1164 }
1165 }
1166 assert(np <= LEAST_SQUARES_SAMPLES_MAX);
1167
1168 // scan the nearest left columns
1169 if (left_available) {
1170 const int mi_col_offset = -1;
1171 const MB_MODE_INFO *mbmi = xd->mi[mi_col_offset];
1172 uint8_t superblock_height = mi_size_high[mbmi->sb_type];
1173
1174 if (xd->height <= superblock_height) {
1175 // Handle "current block height <= above block height" case.
1176 const int row_offset = -mi_row % superblock_height;
1177
1178 if (row_offset < 0) do_tl = 0;
1179
1180 if (mbmi->ref_frame[0] == ref_frame && mbmi->ref_frame[1] == NONE_FRAME) {
1181 record_samples(mbmi, pts, pts_inref, row_offset, 1, 0, -1);
1182 pts += 2;
1183 pts_inref += 2;
1184 np++;
1185 if (np >= LEAST_SQUARES_SAMPLES_MAX) return LEAST_SQUARES_SAMPLES_MAX;
1186 }
1187 } else {
1188 // Handle "current block height > above block height" case.
1189 for (i = 0; i < AOMMIN(xd->height, cm->mi_params.mi_rows - mi_row);
1190 i += mi_step) {
1191 mbmi = xd->mi[mi_col_offset + i * mi_stride];
1192 superblock_height = mi_size_high[mbmi->sb_type];
1193 mi_step = AOMMIN(xd->height, superblock_height);
1194
1195 if (mbmi->ref_frame[0] == ref_frame &&
1196 mbmi->ref_frame[1] == NONE_FRAME) {
1197 record_samples(mbmi, pts, pts_inref, i, 1, 0, -1);
1198 pts += 2;
1199 pts_inref += 2;
1200 np++;
1201 if (np >= LEAST_SQUARES_SAMPLES_MAX) return LEAST_SQUARES_SAMPLES_MAX;
1202 }
1203 }
1204 }
1205 }
1206 assert(np <= LEAST_SQUARES_SAMPLES_MAX);
1207
1208 // Top-left block
1209 if (do_tl && left_available && up_available) {
1210 const int mi_row_offset = -1;
1211 const int mi_col_offset = -1;
1212 MB_MODE_INFO *mbmi = xd->mi[mi_col_offset + mi_row_offset * mi_stride];
1213
1214 if (mbmi->ref_frame[0] == ref_frame && mbmi->ref_frame[1] == NONE_FRAME) {
1215 record_samples(mbmi, pts, pts_inref, 0, -1, 0, -1);
1216 pts += 2;
1217 pts_inref += 2;
1218 np++;
1219 if (np >= LEAST_SQUARES_SAMPLES_MAX) return LEAST_SQUARES_SAMPLES_MAX;
1220 }
1221 }
1222 assert(np <= LEAST_SQUARES_SAMPLES_MAX);
1223
1224 // Top-right block
1225 if (do_tr &&
1226 has_top_right(cm, xd, mi_row, mi_col, AOMMAX(xd->width, xd->height))) {
1227 const POSITION trb_pos = { -1, xd->width };
1228 const TileInfo *const tile = &xd->tile;
1229 if (is_inside(tile, mi_col, mi_row, &trb_pos)) {
1230 const int mi_row_offset = -1;
1231 const int mi_col_offset = xd->width;
1232 const MB_MODE_INFO *mbmi =
1233 xd->mi[mi_col_offset + mi_row_offset * mi_stride];
1234
1235 if (mbmi->ref_frame[0] == ref_frame && mbmi->ref_frame[1] == NONE_FRAME) {
1236 record_samples(mbmi, pts, pts_inref, 0, -1, xd->width, 1);
1237 np++;
1238 if (np >= LEAST_SQUARES_SAMPLES_MAX) return LEAST_SQUARES_SAMPLES_MAX;
1239 }
1240 }
1241 }
1242 assert(np <= LEAST_SQUARES_SAMPLES_MAX);
1243
1244 return np;
1245 }
1246
av1_setup_skip_mode_allowed(AV1_COMMON * cm)1247 void av1_setup_skip_mode_allowed(AV1_COMMON *cm) {
1248 const OrderHintInfo *const order_hint_info = &cm->seq_params.order_hint_info;
1249 SkipModeInfo *const skip_mode_info = &cm->current_frame.skip_mode_info;
1250
1251 skip_mode_info->skip_mode_allowed = 0;
1252 skip_mode_info->ref_frame_idx_0 = INVALID_IDX;
1253 skip_mode_info->ref_frame_idx_1 = INVALID_IDX;
1254
1255 if (!order_hint_info->enable_order_hint || frame_is_intra_only(cm) ||
1256 cm->current_frame.reference_mode == SINGLE_REFERENCE)
1257 return;
1258
1259 const int cur_order_hint = cm->current_frame.order_hint;
1260 int ref_order_hints[2] = { -1, INT_MAX };
1261 int ref_idx[2] = { INVALID_IDX, INVALID_IDX };
1262
1263 // Identify the nearest forward and backward references.
1264 for (int i = 0; i < INTER_REFS_PER_FRAME; ++i) {
1265 const RefCntBuffer *const buf = get_ref_frame_buf(cm, LAST_FRAME + i);
1266 if (buf == NULL) continue;
1267
1268 const int ref_order_hint = buf->order_hint;
1269 if (get_relative_dist(order_hint_info, ref_order_hint, cur_order_hint) <
1270 0) {
1271 // Forward reference
1272 if (ref_order_hints[0] == -1 ||
1273 get_relative_dist(order_hint_info, ref_order_hint,
1274 ref_order_hints[0]) > 0) {
1275 ref_order_hints[0] = ref_order_hint;
1276 ref_idx[0] = i;
1277 }
1278 } else if (get_relative_dist(order_hint_info, ref_order_hint,
1279 cur_order_hint) > 0) {
1280 // Backward reference
1281 if (ref_order_hints[1] == INT_MAX ||
1282 get_relative_dist(order_hint_info, ref_order_hint,
1283 ref_order_hints[1]) < 0) {
1284 ref_order_hints[1] = ref_order_hint;
1285 ref_idx[1] = i;
1286 }
1287 }
1288 }
1289
1290 if (ref_idx[0] != INVALID_IDX && ref_idx[1] != INVALID_IDX) {
1291 // == Bi-directional prediction ==
1292 skip_mode_info->skip_mode_allowed = 1;
1293 skip_mode_info->ref_frame_idx_0 = AOMMIN(ref_idx[0], ref_idx[1]);
1294 skip_mode_info->ref_frame_idx_1 = AOMMAX(ref_idx[0], ref_idx[1]);
1295 } else if (ref_idx[0] != INVALID_IDX && ref_idx[1] == INVALID_IDX) {
1296 // == Forward prediction only ==
1297 // Identify the second nearest forward reference.
1298 ref_order_hints[1] = -1;
1299 for (int i = 0; i < INTER_REFS_PER_FRAME; ++i) {
1300 const RefCntBuffer *const buf = get_ref_frame_buf(cm, LAST_FRAME + i);
1301 if (buf == NULL) continue;
1302
1303 const int ref_order_hint = buf->order_hint;
1304 if ((ref_order_hints[0] != -1 &&
1305 get_relative_dist(order_hint_info, ref_order_hint,
1306 ref_order_hints[0]) < 0) &&
1307 (ref_order_hints[1] == -1 ||
1308 get_relative_dist(order_hint_info, ref_order_hint,
1309 ref_order_hints[1]) > 0)) {
1310 // Second closest forward reference
1311 ref_order_hints[1] = ref_order_hint;
1312 ref_idx[1] = i;
1313 }
1314 }
1315 if (ref_order_hints[1] != -1) {
1316 skip_mode_info->skip_mode_allowed = 1;
1317 skip_mode_info->ref_frame_idx_0 = AOMMIN(ref_idx[0], ref_idx[1]);
1318 skip_mode_info->ref_frame_idx_1 = AOMMAX(ref_idx[0], ref_idx[1]);
1319 }
1320 }
1321 }
1322
1323 typedef struct {
1324 int map_idx; // frame map index
1325 RefCntBuffer *buf; // frame buffer
1326 int sort_idx; // index based on the offset to be used for sorting
1327 } REF_FRAME_INFO;
1328
1329 // Compares the sort_idx fields. If they are equal, then compares the map_idx
1330 // fields to break the tie. This ensures a stable sort.
compare_ref_frame_info(const void * arg_a,const void * arg_b)1331 static int compare_ref_frame_info(const void *arg_a, const void *arg_b) {
1332 const REF_FRAME_INFO *info_a = (REF_FRAME_INFO *)arg_a;
1333 const REF_FRAME_INFO *info_b = (REF_FRAME_INFO *)arg_b;
1334
1335 const int sort_idx_diff = info_a->sort_idx - info_b->sort_idx;
1336 if (sort_idx_diff != 0) return sort_idx_diff;
1337 return info_a->map_idx - info_b->map_idx;
1338 }
1339
set_ref_frame_info(int * remapped_ref_idx,int frame_idx,REF_FRAME_INFO * ref_info)1340 static AOM_INLINE void set_ref_frame_info(int *remapped_ref_idx, int frame_idx,
1341 REF_FRAME_INFO *ref_info) {
1342 assert(frame_idx >= 0 && frame_idx < INTER_REFS_PER_FRAME);
1343
1344 remapped_ref_idx[frame_idx] = ref_info->map_idx;
1345 }
1346
av1_set_frame_refs(AV1_COMMON * const cm,int * remapped_ref_idx,int lst_map_idx,int gld_map_idx)1347 void av1_set_frame_refs(AV1_COMMON *const cm, int *remapped_ref_idx,
1348 int lst_map_idx, int gld_map_idx) {
1349 int lst_frame_sort_idx = -1;
1350 int gld_frame_sort_idx = -1;
1351
1352 assert(cm->seq_params.order_hint_info.enable_order_hint);
1353 assert(cm->seq_params.order_hint_info.order_hint_bits_minus_1 >= 0);
1354 const int cur_order_hint = (int)cm->current_frame.order_hint;
1355 const int cur_frame_sort_idx =
1356 1 << cm->seq_params.order_hint_info.order_hint_bits_minus_1;
1357
1358 REF_FRAME_INFO ref_frame_info[REF_FRAMES];
1359 int ref_flag_list[INTER_REFS_PER_FRAME] = { 0, 0, 0, 0, 0, 0, 0 };
1360
1361 for (int i = 0; i < REF_FRAMES; ++i) {
1362 const int map_idx = i;
1363
1364 ref_frame_info[i].map_idx = map_idx;
1365 ref_frame_info[i].sort_idx = -1;
1366
1367 RefCntBuffer *const buf = cm->ref_frame_map[map_idx];
1368 ref_frame_info[i].buf = buf;
1369
1370 if (buf == NULL) continue;
1371 // If this assertion fails, there is a reference leak.
1372 assert(buf->ref_count > 0);
1373
1374 const int offset = (int)buf->order_hint;
1375 ref_frame_info[i].sort_idx =
1376 (offset == -1) ? -1
1377 : cur_frame_sort_idx +
1378 get_relative_dist(&cm->seq_params.order_hint_info,
1379 offset, cur_order_hint);
1380 assert(ref_frame_info[i].sort_idx >= -1);
1381
1382 if (map_idx == lst_map_idx) lst_frame_sort_idx = ref_frame_info[i].sort_idx;
1383 if (map_idx == gld_map_idx) gld_frame_sort_idx = ref_frame_info[i].sort_idx;
1384 }
1385
1386 // Confirm both LAST_FRAME and GOLDEN_FRAME are valid forward reference
1387 // frames.
1388 if (lst_frame_sort_idx == -1 || lst_frame_sort_idx >= cur_frame_sort_idx) {
1389 aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
1390 "Inter frame requests a look-ahead frame as LAST");
1391 }
1392 if (gld_frame_sort_idx == -1 || gld_frame_sort_idx >= cur_frame_sort_idx) {
1393 aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
1394 "Inter frame requests a look-ahead frame as GOLDEN");
1395 }
1396
1397 // Sort ref frames based on their frame_offset values.
1398 qsort(ref_frame_info, REF_FRAMES, sizeof(REF_FRAME_INFO),
1399 compare_ref_frame_info);
1400
1401 // Identify forward and backward reference frames.
1402 // Forward reference: offset < order_hint
1403 // Backward reference: offset >= order_hint
1404 int fwd_start_idx = 0, fwd_end_idx = REF_FRAMES - 1;
1405
1406 for (int i = 0; i < REF_FRAMES; i++) {
1407 if (ref_frame_info[i].sort_idx == -1) {
1408 fwd_start_idx++;
1409 continue;
1410 }
1411
1412 if (ref_frame_info[i].sort_idx >= cur_frame_sort_idx) {
1413 fwd_end_idx = i - 1;
1414 break;
1415 }
1416 }
1417
1418 int bwd_start_idx = fwd_end_idx + 1;
1419 int bwd_end_idx = REF_FRAMES - 1;
1420
1421 // === Backward Reference Frames ===
1422
1423 // == ALTREF_FRAME ==
1424 if (bwd_start_idx <= bwd_end_idx) {
1425 set_ref_frame_info(remapped_ref_idx, ALTREF_FRAME - LAST_FRAME,
1426 &ref_frame_info[bwd_end_idx]);
1427 ref_flag_list[ALTREF_FRAME - LAST_FRAME] = 1;
1428 bwd_end_idx--;
1429 }
1430
1431 // == BWDREF_FRAME ==
1432 if (bwd_start_idx <= bwd_end_idx) {
1433 set_ref_frame_info(remapped_ref_idx, BWDREF_FRAME - LAST_FRAME,
1434 &ref_frame_info[bwd_start_idx]);
1435 ref_flag_list[BWDREF_FRAME - LAST_FRAME] = 1;
1436 bwd_start_idx++;
1437 }
1438
1439 // == ALTREF2_FRAME ==
1440 if (bwd_start_idx <= bwd_end_idx) {
1441 set_ref_frame_info(remapped_ref_idx, ALTREF2_FRAME - LAST_FRAME,
1442 &ref_frame_info[bwd_start_idx]);
1443 ref_flag_list[ALTREF2_FRAME - LAST_FRAME] = 1;
1444 }
1445
1446 // === Forward Reference Frames ===
1447
1448 for (int i = fwd_start_idx; i <= fwd_end_idx; ++i) {
1449 // == LAST_FRAME ==
1450 if (ref_frame_info[i].map_idx == lst_map_idx) {
1451 set_ref_frame_info(remapped_ref_idx, LAST_FRAME - LAST_FRAME,
1452 &ref_frame_info[i]);
1453 ref_flag_list[LAST_FRAME - LAST_FRAME] = 1;
1454 }
1455
1456 // == GOLDEN_FRAME ==
1457 if (ref_frame_info[i].map_idx == gld_map_idx) {
1458 set_ref_frame_info(remapped_ref_idx, GOLDEN_FRAME - LAST_FRAME,
1459 &ref_frame_info[i]);
1460 ref_flag_list[GOLDEN_FRAME - LAST_FRAME] = 1;
1461 }
1462 }
1463
1464 assert(ref_flag_list[LAST_FRAME - LAST_FRAME] == 1 &&
1465 ref_flag_list[GOLDEN_FRAME - LAST_FRAME] == 1);
1466
1467 // == LAST2_FRAME ==
1468 // == LAST3_FRAME ==
1469 // == BWDREF_FRAME ==
1470 // == ALTREF2_FRAME ==
1471 // == ALTREF_FRAME ==
1472
1473 // Set up the reference frames in the anti-chronological order.
1474 static const MV_REFERENCE_FRAME ref_frame_list[INTER_REFS_PER_FRAME - 2] = {
1475 LAST2_FRAME, LAST3_FRAME, BWDREF_FRAME, ALTREF2_FRAME, ALTREF_FRAME
1476 };
1477
1478 int ref_idx;
1479 for (ref_idx = 0; ref_idx < (INTER_REFS_PER_FRAME - 2); ref_idx++) {
1480 const MV_REFERENCE_FRAME ref_frame = ref_frame_list[ref_idx];
1481
1482 if (ref_flag_list[ref_frame - LAST_FRAME] == 1) continue;
1483
1484 while (fwd_start_idx <= fwd_end_idx &&
1485 (ref_frame_info[fwd_end_idx].map_idx == lst_map_idx ||
1486 ref_frame_info[fwd_end_idx].map_idx == gld_map_idx)) {
1487 fwd_end_idx--;
1488 }
1489 if (fwd_start_idx > fwd_end_idx) break;
1490
1491 set_ref_frame_info(remapped_ref_idx, ref_frame - LAST_FRAME,
1492 &ref_frame_info[fwd_end_idx]);
1493 ref_flag_list[ref_frame - LAST_FRAME] = 1;
1494
1495 fwd_end_idx--;
1496 }
1497
1498 // Assign all the remaining frame(s), if any, to the earliest reference
1499 // frame.
1500 for (; ref_idx < (INTER_REFS_PER_FRAME - 2); ref_idx++) {
1501 const MV_REFERENCE_FRAME ref_frame = ref_frame_list[ref_idx];
1502 if (ref_flag_list[ref_frame - LAST_FRAME] == 1) continue;
1503 set_ref_frame_info(remapped_ref_idx, ref_frame - LAST_FRAME,
1504 &ref_frame_info[fwd_start_idx]);
1505 ref_flag_list[ref_frame - LAST_FRAME] = 1;
1506 }
1507
1508 for (int i = 0; i < INTER_REFS_PER_FRAME; i++) {
1509 assert(ref_flag_list[i] == 1);
1510 }
1511 }
1512