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 #ifndef AOM_AV1_COMMON_MVREF_COMMON_H_
12 #define AOM_AV1_COMMON_MVREF_COMMON_H_
13
14 #include "av1/common/onyxc_int.h"
15 #include "av1/common/blockd.h"
16
17 #ifdef __cplusplus
18 extern "C" {
19 #endif
20
21 #define MVREF_ROW_COLS 3
22
23 // Set the upper limit of the motion vector component magnitude.
24 // This would make a motion vector fit in 26 bits. Plus 3 bits for the
25 // reference frame index. A tuple of motion vector can hence be stored within
26 // 32 bit range for efficient load/store operations.
27 #define REFMVS_LIMIT ((1 << 12) - 1)
28
29 typedef struct position {
30 int row;
31 int col;
32 } POSITION;
33
34 // clamp_mv_ref
35 #define MV_BORDER (16 << 3) // Allow 16 pels in 1/8th pel units
36
get_relative_dist(const OrderHintInfo * oh,int a,int b)37 static INLINE int get_relative_dist(const OrderHintInfo *oh, int a, int b) {
38 if (!oh->enable_order_hint) return 0;
39
40 const int bits = oh->order_hint_bits_minus_1 + 1;
41
42 assert(bits >= 1);
43 assert(a >= 0 && a < (1 << bits));
44 assert(b >= 0 && b < (1 << bits));
45
46 int diff = a - b;
47 const int m = 1 << (bits - 1);
48 diff = (diff & (m - 1)) - (diff & m);
49 return diff;
50 }
51
clamp_mv_ref(MV * mv,int bw,int bh,const MACROBLOCKD * xd)52 static INLINE void clamp_mv_ref(MV *mv, int bw, int bh, const MACROBLOCKD *xd) {
53 clamp_mv(mv, xd->mb_to_left_edge - bw * 8 - MV_BORDER,
54 xd->mb_to_right_edge + bw * 8 + MV_BORDER,
55 xd->mb_to_top_edge - bh * 8 - MV_BORDER,
56 xd->mb_to_bottom_edge + bh * 8 + MV_BORDER);
57 }
58
59 // This function returns either the appropriate sub block or block's mv
60 // on whether the block_size < 8x8 and we have check_sub_blocks set.
get_sub_block_mv(const MB_MODE_INFO * candidate,int which_mv,int search_col)61 static INLINE int_mv get_sub_block_mv(const MB_MODE_INFO *candidate,
62 int which_mv, int search_col) {
63 (void)search_col;
64 return candidate->mv[which_mv];
65 }
66
get_sub_block_pred_mv(const MB_MODE_INFO * candidate,int which_mv,int search_col)67 static INLINE int_mv get_sub_block_pred_mv(const MB_MODE_INFO *candidate,
68 int which_mv, int search_col) {
69 (void)search_col;
70 return candidate->mv[which_mv];
71 }
72
73 // Checks that the given mi_row, mi_col and search point
74 // are inside the borders of the tile.
is_inside(const TileInfo * const tile,int mi_col,int mi_row,const POSITION * mi_pos)75 static INLINE int is_inside(const TileInfo *const tile, int mi_col, int mi_row,
76 const POSITION *mi_pos) {
77 return !(mi_row + mi_pos->row < tile->mi_row_start ||
78 mi_col + mi_pos->col < tile->mi_col_start ||
79 mi_row + mi_pos->row >= tile->mi_row_end ||
80 mi_col + mi_pos->col >= tile->mi_col_end);
81 }
82
find_valid_row_offset(const TileInfo * const tile,int mi_row,int row_offset)83 static INLINE int find_valid_row_offset(const TileInfo *const tile, int mi_row,
84 int row_offset) {
85 return clamp(row_offset, tile->mi_row_start - mi_row,
86 tile->mi_row_end - mi_row - 1);
87 }
88
find_valid_col_offset(const TileInfo * const tile,int mi_col,int col_offset)89 static INLINE int find_valid_col_offset(const TileInfo *const tile, int mi_col,
90 int col_offset) {
91 return clamp(col_offset, tile->mi_col_start - mi_col,
92 tile->mi_col_end - mi_col - 1);
93 }
94
lower_mv_precision(MV * mv,int allow_hp,int is_integer)95 static INLINE void lower_mv_precision(MV *mv, int allow_hp, int is_integer) {
96 if (is_integer) {
97 integer_mv_precision(mv);
98 } else {
99 if (!allow_hp) {
100 if (mv->row & 1) mv->row += (mv->row > 0 ? -1 : 1);
101 if (mv->col & 1) mv->col += (mv->col > 0 ? -1 : 1);
102 }
103 }
104 }
105
get_uni_comp_ref_idx(const MV_REFERENCE_FRAME * const rf)106 static INLINE int8_t get_uni_comp_ref_idx(const MV_REFERENCE_FRAME *const rf) {
107 // Single ref pred
108 if (rf[1] <= INTRA_FRAME) return -1;
109
110 // Bi-directional comp ref pred
111 if ((rf[0] < BWDREF_FRAME) && (rf[1] >= BWDREF_FRAME)) return -1;
112
113 for (int8_t ref_idx = 0; ref_idx < TOTAL_UNIDIR_COMP_REFS; ++ref_idx) {
114 if (rf[0] == comp_ref0(ref_idx) && rf[1] == comp_ref1(ref_idx))
115 return ref_idx;
116 }
117 return -1;
118 }
119
av1_ref_frame_type(const MV_REFERENCE_FRAME * const rf)120 static INLINE int8_t av1_ref_frame_type(const MV_REFERENCE_FRAME *const rf) {
121 if (rf[1] > INTRA_FRAME) {
122 const int8_t uni_comp_ref_idx = get_uni_comp_ref_idx(rf);
123 if (uni_comp_ref_idx >= 0) {
124 assert((REF_FRAMES + FWD_REFS * BWD_REFS + uni_comp_ref_idx) <
125 MODE_CTX_REF_FRAMES);
126 return REF_FRAMES + FWD_REFS * BWD_REFS + uni_comp_ref_idx;
127 } else {
128 return REF_FRAMES + FWD_RF_OFFSET(rf[0]) +
129 BWD_RF_OFFSET(rf[1]) * FWD_REFS;
130 }
131 }
132
133 return rf[0];
134 }
135
136 // clang-format off
137 static MV_REFERENCE_FRAME ref_frame_map[TOTAL_COMP_REFS][2] = {
138 { LAST_FRAME, BWDREF_FRAME }, { LAST2_FRAME, BWDREF_FRAME },
139 { LAST3_FRAME, BWDREF_FRAME }, { GOLDEN_FRAME, BWDREF_FRAME },
140
141 { LAST_FRAME, ALTREF2_FRAME }, { LAST2_FRAME, ALTREF2_FRAME },
142 { LAST3_FRAME, ALTREF2_FRAME }, { GOLDEN_FRAME, ALTREF2_FRAME },
143
144 { LAST_FRAME, ALTREF_FRAME }, { LAST2_FRAME, ALTREF_FRAME },
145 { LAST3_FRAME, ALTREF_FRAME }, { GOLDEN_FRAME, ALTREF_FRAME },
146
147 { LAST_FRAME, LAST2_FRAME }, { LAST_FRAME, LAST3_FRAME },
148 { LAST_FRAME, GOLDEN_FRAME }, { BWDREF_FRAME, ALTREF_FRAME },
149
150 // NOTE: Following reference frame pairs are not supported to be explicitly
151 // signalled, but they are possibly chosen by the use of skip_mode,
152 // which may use the most recent one-sided reference frame pair.
153 { LAST2_FRAME, LAST3_FRAME }, { LAST2_FRAME, GOLDEN_FRAME },
154 { LAST3_FRAME, GOLDEN_FRAME }, {BWDREF_FRAME, ALTREF2_FRAME},
155 { ALTREF2_FRAME, ALTREF_FRAME }
156 };
157 // clang-format on
158
av1_set_ref_frame(MV_REFERENCE_FRAME * rf,MV_REFERENCE_FRAME ref_frame_type)159 static INLINE void av1_set_ref_frame(MV_REFERENCE_FRAME *rf,
160 MV_REFERENCE_FRAME ref_frame_type) {
161 if (ref_frame_type >= REF_FRAMES) {
162 rf[0] = ref_frame_map[ref_frame_type - REF_FRAMES][0];
163 rf[1] = ref_frame_map[ref_frame_type - REF_FRAMES][1];
164 } else {
165 assert(ref_frame_type > NONE_FRAME);
166 rf[0] = ref_frame_type;
167 rf[1] = NONE_FRAME;
168 }
169 }
170
171 static uint16_t compound_mode_ctx_map[3][COMP_NEWMV_CTXS] = {
172 { 0, 1, 1, 1, 1 },
173 { 1, 2, 3, 4, 4 },
174 { 4, 4, 5, 6, 7 },
175 };
176
av1_mode_context_analyzer(const int16_t * const mode_context,const MV_REFERENCE_FRAME * const rf)177 static INLINE int16_t av1_mode_context_analyzer(
178 const int16_t *const mode_context, const MV_REFERENCE_FRAME *const rf) {
179 const int8_t ref_frame = av1_ref_frame_type(rf);
180
181 if (rf[1] <= INTRA_FRAME) return mode_context[ref_frame];
182
183 const int16_t newmv_ctx = mode_context[ref_frame] & NEWMV_CTX_MASK;
184 const int16_t refmv_ctx =
185 (mode_context[ref_frame] >> REFMV_OFFSET) & REFMV_CTX_MASK;
186
187 const int16_t comp_ctx = compound_mode_ctx_map[refmv_ctx >> 1][AOMMIN(
188 newmv_ctx, COMP_NEWMV_CTXS - 1)];
189 return comp_ctx;
190 }
191
av1_drl_ctx(const CANDIDATE_MV * ref_mv_stack,int ref_idx)192 static INLINE uint8_t av1_drl_ctx(const CANDIDATE_MV *ref_mv_stack,
193 int ref_idx) {
194 if (ref_mv_stack[ref_idx].weight >= REF_CAT_LEVEL &&
195 ref_mv_stack[ref_idx + 1].weight >= REF_CAT_LEVEL)
196 return 0;
197
198 if (ref_mv_stack[ref_idx].weight >= REF_CAT_LEVEL &&
199 ref_mv_stack[ref_idx + 1].weight < REF_CAT_LEVEL)
200 return 1;
201
202 if (ref_mv_stack[ref_idx].weight < REF_CAT_LEVEL &&
203 ref_mv_stack[ref_idx + 1].weight < REF_CAT_LEVEL)
204 return 2;
205
206 return 0;
207 }
208
209 void av1_setup_frame_buf_refs(AV1_COMMON *cm);
210 void av1_setup_frame_sign_bias(AV1_COMMON *cm);
211 void av1_setup_skip_mode_allowed(AV1_COMMON *cm);
212 void av1_setup_motion_field(AV1_COMMON *cm);
213 void av1_set_frame_refs(AV1_COMMON *const cm, int *remapped_ref_idx,
214 int lst_map_idx, int gld_map_idx);
215
av1_collect_neighbors_ref_counts(MACROBLOCKD * const xd)216 static INLINE void av1_collect_neighbors_ref_counts(MACROBLOCKD *const xd) {
217 av1_zero(xd->neighbors_ref_counts);
218
219 uint8_t *const ref_counts = xd->neighbors_ref_counts;
220
221 const MB_MODE_INFO *const above_mbmi = xd->above_mbmi;
222 const MB_MODE_INFO *const left_mbmi = xd->left_mbmi;
223 const int above_in_image = xd->up_available;
224 const int left_in_image = xd->left_available;
225
226 // Above neighbor
227 if (above_in_image && is_inter_block(above_mbmi)) {
228 ref_counts[above_mbmi->ref_frame[0]]++;
229 if (has_second_ref(above_mbmi)) {
230 ref_counts[above_mbmi->ref_frame[1]]++;
231 }
232 }
233
234 // Left neighbor
235 if (left_in_image && is_inter_block(left_mbmi)) {
236 ref_counts[left_mbmi->ref_frame[0]]++;
237 if (has_second_ref(left_mbmi)) {
238 ref_counts[left_mbmi->ref_frame[1]]++;
239 }
240 }
241 }
242
243 void av1_copy_frame_mvs(const AV1_COMMON *const cm,
244 const MB_MODE_INFO *const mi, int mi_row, int mi_col,
245 int x_mis, int y_mis);
246
247 // The global_mvs output parameter points to an array of REF_FRAMES elements.
248 // The caller may pass a null global_mvs if it does not need the global_mvs
249 // output.
250 void av1_find_mv_refs(const AV1_COMMON *cm, const MACROBLOCKD *xd,
251 MB_MODE_INFO *mi, MV_REFERENCE_FRAME ref_frame,
252 uint8_t ref_mv_count[MODE_CTX_REF_FRAMES],
253 CANDIDATE_MV ref_mv_stack[][MAX_REF_MV_STACK_SIZE],
254 int_mv mv_ref_list[][MAX_MV_REF_CANDIDATES],
255 int_mv *global_mvs, int mi_row, int mi_col,
256 int16_t *mode_context);
257
258 // check a list of motion vectors by sad score using a number rows of pixels
259 // above and a number cols of pixels in the left to select the one with best
260 // score to use as ref motion vector
261 void av1_find_best_ref_mvs(int allow_hp, int_mv *mvlist, int_mv *nearest_mv,
262 int_mv *near_mv, int is_integer);
263
264 int selectSamples(MV *mv, int *pts, int *pts_inref, int len, BLOCK_SIZE bsize);
265 int findSamples(const AV1_COMMON *cm, MACROBLOCKD *xd, int mi_row, int mi_col,
266 int *pts, int *pts_inref);
267
268 #define INTRABC_DELAY_PIXELS 256 // Delay of 256 pixels
269 #define INTRABC_DELAY_SB64 (INTRABC_DELAY_PIXELS / 64)
270
av1_find_ref_dv(int_mv * ref_dv,const TileInfo * const tile,int mib_size,int mi_row,int mi_col)271 static INLINE void av1_find_ref_dv(int_mv *ref_dv, const TileInfo *const tile,
272 int mib_size, int mi_row, int mi_col) {
273 (void)mi_col;
274 if (mi_row - mib_size < tile->mi_row_start) {
275 ref_dv->as_mv.row = 0;
276 ref_dv->as_mv.col = -MI_SIZE * mib_size - INTRABC_DELAY_PIXELS;
277 } else {
278 ref_dv->as_mv.row = -MI_SIZE * mib_size;
279 ref_dv->as_mv.col = 0;
280 }
281 ref_dv->as_mv.row *= 8;
282 ref_dv->as_mv.col *= 8;
283 }
284
av1_is_dv_valid(const MV dv,const AV1_COMMON * cm,const MACROBLOCKD * xd,int mi_row,int mi_col,BLOCK_SIZE bsize,int mib_size_log2)285 static INLINE int av1_is_dv_valid(const MV dv, const AV1_COMMON *cm,
286 const MACROBLOCKD *xd, int mi_row, int mi_col,
287 BLOCK_SIZE bsize, int mib_size_log2) {
288 const int bw = block_size_wide[bsize];
289 const int bh = block_size_high[bsize];
290 const int SCALE_PX_TO_MV = 8;
291 // Disallow subpixel for now
292 // SUBPEL_MASK is not the correct scale
293 if (((dv.row & (SCALE_PX_TO_MV - 1)) || (dv.col & (SCALE_PX_TO_MV - 1))))
294 return 0;
295
296 const TileInfo *const tile = &xd->tile;
297 // Is the source top-left inside the current tile?
298 const int src_top_edge = mi_row * MI_SIZE * SCALE_PX_TO_MV + dv.row;
299 const int tile_top_edge = tile->mi_row_start * MI_SIZE * SCALE_PX_TO_MV;
300 if (src_top_edge < tile_top_edge) return 0;
301 const int src_left_edge = mi_col * MI_SIZE * SCALE_PX_TO_MV + dv.col;
302 const int tile_left_edge = tile->mi_col_start * MI_SIZE * SCALE_PX_TO_MV;
303 if (src_left_edge < tile_left_edge) return 0;
304 // Is the bottom right inside the current tile?
305 const int src_bottom_edge = (mi_row * MI_SIZE + bh) * SCALE_PX_TO_MV + dv.row;
306 const int tile_bottom_edge = tile->mi_row_end * MI_SIZE * SCALE_PX_TO_MV;
307 if (src_bottom_edge > tile_bottom_edge) return 0;
308 const int src_right_edge = (mi_col * MI_SIZE + bw) * SCALE_PX_TO_MV + dv.col;
309 const int tile_right_edge = tile->mi_col_end * MI_SIZE * SCALE_PX_TO_MV;
310 if (src_right_edge > tile_right_edge) return 0;
311
312 // Special case for sub 8x8 chroma cases, to prevent referring to chroma
313 // pixels outside current tile.
314 for (int plane = 1; plane < av1_num_planes(cm); ++plane) {
315 const struct macroblockd_plane *const pd = &xd->plane[plane];
316 if (is_chroma_reference(mi_row, mi_col, bsize, pd->subsampling_x,
317 pd->subsampling_y)) {
318 if (bw < 8 && pd->subsampling_x)
319 if (src_left_edge < tile_left_edge + 4 * SCALE_PX_TO_MV) return 0;
320 if (bh < 8 && pd->subsampling_y)
321 if (src_top_edge < tile_top_edge + 4 * SCALE_PX_TO_MV) return 0;
322 }
323 }
324
325 // Is the bottom right within an already coded SB? Also consider additional
326 // constraints to facilitate HW decoder.
327 const int max_mib_size = 1 << mib_size_log2;
328 const int active_sb_row = mi_row >> mib_size_log2;
329 const int active_sb64_col = (mi_col * MI_SIZE) >> 6;
330 const int sb_size = max_mib_size * MI_SIZE;
331 const int src_sb_row = ((src_bottom_edge >> 3) - 1) / sb_size;
332 const int src_sb64_col = ((src_right_edge >> 3) - 1) >> 6;
333 const int total_sb64_per_row =
334 ((tile->mi_col_end - tile->mi_col_start - 1) >> 4) + 1;
335 const int active_sb64 = active_sb_row * total_sb64_per_row + active_sb64_col;
336 const int src_sb64 = src_sb_row * total_sb64_per_row + src_sb64_col;
337 if (src_sb64 >= active_sb64 - INTRABC_DELAY_SB64) return 0;
338
339 // Wavefront constraint: use only top left area of frame for reference.
340 const int gradient = 1 + INTRABC_DELAY_SB64 + (sb_size > 64);
341 const int wf_offset = gradient * (active_sb_row - src_sb_row);
342 if (src_sb_row > active_sb_row ||
343 src_sb64_col >= active_sb64_col - INTRABC_DELAY_SB64 + wf_offset)
344 return 0;
345
346 return 1;
347 }
348
349 #ifdef __cplusplus
350 } // extern "C"
351 #endif
352
353 #endif // AOM_AV1_COMMON_MVREF_COMMON_H_
354