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 <assert.h>
13 #include <limits.h>
14
15 #include "./aom_scale_rtcd.h"
16
17 #include "aom_dsp/aom_dsp_common.h"
18 #include "aom_dsp/psnr.h"
19 #include "aom_mem/aom_mem.h"
20 #include "aom_ports/mem.h"
21
22 #include "av1/common/av1_loopfilter.h"
23 #include "av1/common/onyxc_int.h"
24 #include "av1/common/quant_common.h"
25
26 #include "av1/encoder/av1_quantize.h"
27 #include "av1/encoder/encoder.h"
28 #include "av1/encoder/picklpf.h"
29
30 #if CONFIG_LPF_SB
31 #if CONFIG_HIGHBITDEPTH
compute_sb_y_sse_highbd(const YV12_BUFFER_CONFIG * src,const YV12_BUFFER_CONFIG * frame,AV1_COMMON * const cm,int mi_row,int mi_col)32 static int compute_sb_y_sse_highbd(const YV12_BUFFER_CONFIG *src,
33 const YV12_BUFFER_CONFIG *frame,
34 AV1_COMMON *const cm, int mi_row,
35 int mi_col) {
36 int sse = 0;
37 const int mi_row_start = AOMMAX(0, mi_row - FILT_BOUNDARY_MI_OFFSET);
38 const int mi_col_start = AOMMAX(0, mi_col - FILT_BOUNDARY_MI_OFFSET);
39 const int mi_row_range = mi_row - FILT_BOUNDARY_MI_OFFSET + MAX_MIB_SIZE;
40 const int mi_col_range = mi_col - FILT_BOUNDARY_MI_OFFSET + MAX_MIB_SIZE;
41 const int mi_row_end = AOMMIN(mi_row_range, cm->mi_rows);
42 const int mi_col_end = AOMMIN(mi_col_range, cm->mi_cols);
43
44 const int row = mi_row_start * MI_SIZE;
45 const int col = mi_col_start * MI_SIZE;
46 const uint16_t *src_y =
47 CONVERT_TO_SHORTPTR(src->y_buffer) + row * src->y_stride + col;
48 const uint16_t *frame_y =
49 CONVERT_TO_SHORTPTR(frame->y_buffer) + row * frame->y_stride + col;
50 const int row_end = (mi_row_end - mi_row_start) * MI_SIZE;
51 const int col_end = (mi_col_end - mi_col_start) * MI_SIZE;
52
53 int x, y;
54 for (y = 0; y < row_end; ++y) {
55 for (x = 0; x < col_end; ++x) {
56 const int diff = src_y[x] - frame_y[x];
57 sse += diff * diff;
58 }
59 src_y += src->y_stride;
60 frame_y += frame->y_stride;
61 }
62 return sse;
63 }
64 #endif
65
compute_sb_y_sse(const YV12_BUFFER_CONFIG * src,const YV12_BUFFER_CONFIG * frame,AV1_COMMON * const cm,int mi_row,int mi_col)66 static int compute_sb_y_sse(const YV12_BUFFER_CONFIG *src,
67 const YV12_BUFFER_CONFIG *frame,
68 AV1_COMMON *const cm, int mi_row, int mi_col) {
69 int sse = 0;
70 const int mi_row_start = AOMMAX(0, mi_row - FILT_BOUNDARY_MI_OFFSET);
71 const int mi_col_start = AOMMAX(0, mi_col - FILT_BOUNDARY_MI_OFFSET);
72 const int mi_row_range = mi_row - FILT_BOUNDARY_MI_OFFSET + MAX_MIB_SIZE;
73 const int mi_col_range = mi_col - FILT_BOUNDARY_MI_OFFSET + MAX_MIB_SIZE;
74 const int mi_row_end = AOMMIN(mi_row_range, cm->mi_rows);
75 const int mi_col_end = AOMMIN(mi_col_range, cm->mi_cols);
76
77 const int row = mi_row_start * MI_SIZE;
78 const int col = mi_col_start * MI_SIZE;
79 const uint8_t *src_y = src->y_buffer + row * src->y_stride + col;
80 const uint8_t *frame_y = frame->y_buffer + row * frame->y_stride + col;
81 const int row_end = (mi_row_end - mi_row_start) * MI_SIZE;
82 const int col_end = (mi_col_end - mi_col_start) * MI_SIZE;
83
84 int x, y;
85 for (y = 0; y < row_end; ++y) {
86 for (x = 0; x < col_end; ++x) {
87 const int diff = src_y[x] - frame_y[x];
88 sse += diff * diff;
89 }
90 src_y += src->y_stride;
91 frame_y += frame->y_stride;
92 }
93 return sse;
94 }
95 #endif // CONFIG_LPF_SB
96
97 #if !CONFIG_LPF_SB
yv12_copy_plane(const YV12_BUFFER_CONFIG * src_bc,YV12_BUFFER_CONFIG * dst_bc,int plane)98 static void yv12_copy_plane(const YV12_BUFFER_CONFIG *src_bc,
99 YV12_BUFFER_CONFIG *dst_bc, int plane) {
100 switch (plane) {
101 case 0: aom_yv12_copy_y(src_bc, dst_bc); break;
102 case 1: aom_yv12_copy_u(src_bc, dst_bc); break;
103 case 2: aom_yv12_copy_v(src_bc, dst_bc); break;
104 default: assert(plane >= 0 && plane <= 2); break;
105 }
106 }
107 #endif // CONFIG_LPF_SB
108
av1_get_max_filter_level(const AV1_COMP * cpi)109 int av1_get_max_filter_level(const AV1_COMP *cpi) {
110 if (cpi->oxcf.pass == 2) {
111 return cpi->twopass.section_intra_rating > 8 ? MAX_LOOP_FILTER * 3 / 4
112 : MAX_LOOP_FILTER;
113 } else {
114 return MAX_LOOP_FILTER;
115 }
116 }
117
118 #if CONFIG_LPF_SB
119 // TODO(chengchen): reduce memory usage by copy superblock instead of frame
try_filter_superblock(const YV12_BUFFER_CONFIG * sd,AV1_COMP * const cpi,int filt_level,int partial_frame,int mi_row,int mi_col)120 static int try_filter_superblock(const YV12_BUFFER_CONFIG *sd,
121 AV1_COMP *const cpi, int filt_level,
122 int partial_frame, int mi_row, int mi_col) {
123 AV1_COMMON *const cm = &cpi->common;
124 int filt_err;
125
126 #if CONFIG_VAR_TX || CONFIG_EXT_PARTITION || CONFIG_CB4X4
127 av1_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, filt_level, 1,
128 partial_frame, mi_row, mi_col);
129 #else
130 if (cpi->num_workers > 1)
131 av1_loop_filter_frame_mt(cm->frame_to_show, cm, cpi->td.mb.e_mbd.plane,
132 filt_level, 1, partial_frame, cpi->workers,
133 cpi->num_workers, &cpi->lf_row_sync);
134 else
135 av1_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, filt_level,
136 1, partial_frame);
137 #endif
138
139 #if CONFIG_HIGHBITDEPTH
140 if (cm->use_highbitdepth) {
141 filt_err =
142 compute_sb_y_sse_highbd(sd, cm->frame_to_show, cm, mi_row, mi_col);
143 } else {
144 filt_err = compute_sb_y_sse(sd, cm->frame_to_show, cm, mi_row, mi_col);
145 }
146 #else
147 filt_err = compute_sb_y_sse(sd, cm->frame_to_show, cm, mi_row, mi_col);
148 #endif // CONFIG_HIGHBITDEPTH
149
150 // TODO(chengchen): Copy the superblock only
151 // Re-instate the unfiltered frame
152 aom_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
153
154 return filt_err;
155 }
156
search_filter_level(const YV12_BUFFER_CONFIG * sd,AV1_COMP * cpi,int partial_frame,double * best_cost_ret,int mi_row,int mi_col,int last_lvl)157 static int search_filter_level(const YV12_BUFFER_CONFIG *sd, AV1_COMP *cpi,
158 int partial_frame, double *best_cost_ret,
159 int mi_row, int mi_col, int last_lvl) {
160 assert(partial_frame == 1);
161 assert(last_lvl >= 0);
162
163 const AV1_COMMON *const cm = &cpi->common;
164 MACROBLOCK *x = &cpi->td.mb;
165
166 int min_filter_level = AOMMAX(0, last_lvl - MAX_LPF_OFFSET);
167 int max_filter_level =
168 AOMMIN(av1_get_max_filter_level(cpi), last_lvl + MAX_LPF_OFFSET);
169
170 // search a larger range for the start superblock
171 if (mi_row == 0 && mi_col == 0) {
172 min_filter_level = 0;
173 max_filter_level = av1_get_max_filter_level(cpi);
174 }
175
176 // TODO(chengchen): Copy for superblock only
177 // Make a copy of the unfiltered / processed recon buffer
178 aom_yv12_copy_y(cm->frame_to_show, &cpi->last_frame_uf);
179
180 int estimate_err =
181 try_filter_superblock(sd, cpi, last_lvl, partial_frame, mi_row, mi_col);
182
183 int best_err = estimate_err;
184 int filt_best = last_lvl;
185
186 int i;
187 for (i = min_filter_level; i <= max_filter_level; i += LPF_STEP) {
188 if (i == last_lvl) continue;
189
190 int filt_err =
191 try_filter_superblock(sd, cpi, i, partial_frame, mi_row, mi_col);
192
193 if (filt_err < best_err) {
194 best_err = filt_err;
195 filt_best = i;
196 }
197 }
198
199 // If previous sb filter level has similar filtering performance as current
200 // best filter level, use previous level such that we can only send one bit
201 // to indicate current filter level is the same as the previous.
202 int threshold = 400;
203
204 // ratio = the filtering area / a superblock size
205 int ratio = 1;
206 if (mi_row + MAX_MIB_SIZE > cm->mi_rows) {
207 ratio *= (cm->mi_rows - mi_row);
208 } else {
209 if (mi_row == 0) {
210 ratio *= (MAX_MIB_SIZE - FILT_BOUNDARY_MI_OFFSET);
211 } else {
212 ratio *= MAX_MIB_SIZE;
213 }
214 }
215 if (mi_col + MAX_MIB_SIZE > cm->mi_cols) {
216 ratio *= (cm->mi_cols - mi_col);
217 } else {
218 if (mi_col == 0) {
219 ratio *= (MAX_MIB_SIZE - FILT_BOUNDARY_MI_OFFSET);
220 } else {
221 ratio *= MAX_MIB_SIZE;
222 }
223 }
224 threshold = threshold * ratio / (MAX_MIB_SIZE * MAX_MIB_SIZE);
225
226 const int diff = abs(estimate_err - best_err);
227
228 const int percent_thresh = (int)((double)estimate_err * 0.01);
229 threshold = AOMMAX(threshold, percent_thresh);
230 if (diff < threshold) {
231 best_err = estimate_err;
232 filt_best = last_lvl;
233 }
234
235 // Compute rdcost to determine whether to reuse previous filter lvl
236 if (filt_best != last_lvl) {
237 }
238
239 if (best_cost_ret) *best_cost_ret = RDCOST_DBL(x->rdmult, 0, best_err);
240 return filt_best;
241 }
242
243 #else // CONFIG_LPF_SB
try_filter_frame(const YV12_BUFFER_CONFIG * sd,AV1_COMP * const cpi,int filt_level,int partial_frame,int plane,int dir)244 static int64_t try_filter_frame(const YV12_BUFFER_CONFIG *sd,
245 AV1_COMP *const cpi, int filt_level,
246 int partial_frame
247 #if CONFIG_LOOPFILTER_LEVEL
248 ,
249 int plane, int dir
250 #endif
251 ) {
252 AV1_COMMON *const cm = &cpi->common;
253 int64_t filt_err;
254
255 #if CONFIG_VAR_TX || CONFIG_EXT_PARTITION || CONFIG_CB4X4
256 #if CONFIG_LOOPFILTER_LEVEL
257 assert(plane >= 0 && plane <= 2);
258 int filter_level[2] = { filt_level, filt_level };
259 if (plane == 0 && dir == 0) filter_level[1] = cm->lf.filter_level[1];
260 if (plane == 0 && dir == 1) filter_level[0] = cm->lf.filter_level[0];
261
262 av1_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd,
263 filter_level[0], filter_level[1], plane, partial_frame);
264 #else
265 av1_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, filt_level, 1,
266 partial_frame);
267 #endif // CONFIG_LOOPFILTER_LEVEL
268 #else
269 if (cpi->num_workers > 1)
270 av1_loop_filter_frame_mt(cm->frame_to_show, cm, cpi->td.mb.e_mbd.plane,
271 filt_level, 1, partial_frame, cpi->workers,
272 cpi->num_workers, &cpi->lf_row_sync);
273 else
274 av1_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, filt_level,
275 1, partial_frame);
276 #endif
277
278 int highbd = 0;
279 #if CONFIG_HIGHBITDEPTH
280 highbd = cm->use_highbitdepth;
281 #endif // CONFIG_HIGHBITDEPTH
282
283 #if CONFIG_LOOPFILTER_LEVEL
284 filt_err = aom_get_sse_plane(sd, cm->frame_to_show, plane, highbd);
285
286 // Re-instate the unfiltered frame
287 yv12_copy_plane(&cpi->last_frame_uf, cm->frame_to_show, plane);
288 #else
289 filt_err = aom_get_sse_plane(sd, cm->frame_to_show, 0, highbd);
290
291 // Re-instate the unfiltered frame
292 yv12_copy_plane(&cpi->last_frame_uf, cm->frame_to_show, 0);
293 #endif // CONFIG_LOOPFILTER_LEVEL
294
295 return filt_err;
296 }
297
search_filter_level(const YV12_BUFFER_CONFIG * sd,AV1_COMP * cpi,int partial_frame,double * best_cost_ret,int plane,int dir)298 static int search_filter_level(const YV12_BUFFER_CONFIG *sd, AV1_COMP *cpi,
299 int partial_frame, double *best_cost_ret
300 #if CONFIG_LOOPFILTER_LEVEL
301 ,
302 int plane, int dir
303 #endif
304 ) {
305 const AV1_COMMON *const cm = &cpi->common;
306 const struct loopfilter *const lf = &cm->lf;
307 const int min_filter_level = 0;
308 const int max_filter_level = av1_get_max_filter_level(cpi);
309 int filt_direction = 0;
310 int64_t best_err;
311 int filt_best;
312 MACROBLOCK *x = &cpi->td.mb;
313
314 // Start the search at the previous frame filter level unless it is now out of
315 // range.
316 #if CONFIG_LOOPFILTER_LEVEL
317 int lvl;
318 switch (plane) {
319 case 0: lvl = (dir == 1) ? lf->filter_level[1] : lf->filter_level[0]; break;
320 case 1: lvl = lf->filter_level_u; break;
321 case 2: lvl = lf->filter_level_v; break;
322 default: assert(plane >= 0 && plane <= 2); return 0;
323 }
324 int filt_mid = clamp(lvl, min_filter_level, max_filter_level);
325 #else
326 int filt_mid = clamp(lf->filter_level, min_filter_level, max_filter_level);
327 #endif // CONFIG_LOOPFILTER_LEVEL
328 int filter_step = filt_mid < 16 ? 4 : filt_mid / 4;
329 // Sum squared error at each filter level
330 int64_t ss_err[MAX_LOOP_FILTER + 1];
331
332 // Set each entry to -1
333 memset(ss_err, 0xFF, sizeof(ss_err));
334
335 #if CONFIG_LOOPFILTER_LEVEL
336 yv12_copy_plane(cm->frame_to_show, &cpi->last_frame_uf, plane);
337 #else
338 // Make a copy of the unfiltered / processed recon buffer
339 aom_yv12_copy_y(cm->frame_to_show, &cpi->last_frame_uf);
340 #endif // CONFIG_LOOPFILTER_LEVEL
341
342 #if CONFIG_LOOPFILTER_LEVEL
343 best_err = try_filter_frame(sd, cpi, filt_mid, partial_frame, plane, dir);
344 #else
345 best_err = try_filter_frame(sd, cpi, filt_mid, partial_frame);
346 #endif // CONFIG_LOOPFILTER_LEVEL
347 filt_best = filt_mid;
348 ss_err[filt_mid] = best_err;
349
350 while (filter_step > 0) {
351 const int filt_high = AOMMIN(filt_mid + filter_step, max_filter_level);
352 const int filt_low = AOMMAX(filt_mid - filter_step, min_filter_level);
353
354 // Bias against raising loop filter in favor of lowering it.
355 int64_t bias = (best_err >> (15 - (filt_mid / 8))) * filter_step;
356
357 if ((cpi->oxcf.pass == 2) && (cpi->twopass.section_intra_rating < 20))
358 bias = (bias * cpi->twopass.section_intra_rating) / 20;
359
360 // yx, bias less for large block size
361 if (cm->tx_mode != ONLY_4X4) bias >>= 1;
362
363 if (filt_direction <= 0 && filt_low != filt_mid) {
364 // Get Low filter error score
365 if (ss_err[filt_low] < 0) {
366 #if CONFIG_LOOPFILTER_LEVEL
367 ss_err[filt_low] =
368 try_filter_frame(sd, cpi, filt_low, partial_frame, plane, dir);
369 #else
370 ss_err[filt_low] = try_filter_frame(sd, cpi, filt_low, partial_frame);
371 #endif // CONFIG_LOOPFILTER_LEVEL
372 }
373 // If value is close to the best so far then bias towards a lower loop
374 // filter value.
375 if (ss_err[filt_low] < (best_err + bias)) {
376 // Was it actually better than the previous best?
377 if (ss_err[filt_low] < best_err) {
378 best_err = ss_err[filt_low];
379 }
380 filt_best = filt_low;
381 }
382 }
383
384 // Now look at filt_high
385 if (filt_direction >= 0 && filt_high != filt_mid) {
386 if (ss_err[filt_high] < 0) {
387 #if CONFIG_LOOPFILTER_LEVEL
388 ss_err[filt_high] =
389 try_filter_frame(sd, cpi, filt_high, partial_frame, plane, dir);
390 #else
391 ss_err[filt_high] = try_filter_frame(sd, cpi, filt_high, partial_frame);
392 #endif // CONFIG_LOOPFILTER_LEVEL
393 }
394 // If value is significantly better than previous best, bias added against
395 // raising filter value
396 if (ss_err[filt_high] < (best_err - bias)) {
397 best_err = ss_err[filt_high];
398 filt_best = filt_high;
399 }
400 }
401
402 // Half the step distance if the best filter value was the same as last time
403 if (filt_best == filt_mid) {
404 filter_step /= 2;
405 filt_direction = 0;
406 } else {
407 filt_direction = (filt_best < filt_mid) ? -1 : 1;
408 filt_mid = filt_best;
409 }
410 }
411
412 // Update best error
413 best_err = ss_err[filt_best];
414
415 if (best_cost_ret) *best_cost_ret = RDCOST_DBL(x->rdmult, 0, best_err);
416 return filt_best;
417 }
418 #endif // CONFIG_LPF_SB
419
av1_pick_filter_level(const YV12_BUFFER_CONFIG * sd,AV1_COMP * cpi,LPF_PICK_METHOD method)420 void av1_pick_filter_level(const YV12_BUFFER_CONFIG *sd, AV1_COMP *cpi,
421 LPF_PICK_METHOD method) {
422 AV1_COMMON *const cm = &cpi->common;
423 struct loopfilter *const lf = &cm->lf;
424
425 lf->sharpness_level = cm->frame_type == KEY_FRAME ? 0 : cpi->oxcf.sharpness;
426
427 if (method == LPF_PICK_MINIMAL_LPF) {
428 #if CONFIG_LOOPFILTER_LEVEL
429 lf->filter_level[0] = 0;
430 lf->filter_level[1] = 0;
431 #else
432 lf->filter_level = 0;
433 #endif
434 } else if (method >= LPF_PICK_FROM_Q) {
435 const int min_filter_level = 0;
436 const int max_filter_level = av1_get_max_filter_level(cpi);
437 const int q = av1_ac_quant(cm->base_qindex, 0, cm->bit_depth);
438 // These values were determined by linear fitting the result of the
439 // searched level, filt_guess = q * 0.316206 + 3.87252
440 #if CONFIG_HIGHBITDEPTH
441 int filt_guess;
442 switch (cm->bit_depth) {
443 case AOM_BITS_8:
444 filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 1015158, 18);
445 break;
446 case AOM_BITS_10:
447 filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 4060632, 20);
448 break;
449 case AOM_BITS_12:
450 filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 16242526, 22);
451 break;
452 default:
453 assert(0 &&
454 "bit_depth should be AOM_BITS_8, AOM_BITS_10 "
455 "or AOM_BITS_12");
456 return;
457 }
458 #else
459 int filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 1015158, 18);
460 #endif // CONFIG_HIGHBITDEPTH
461 if (cm->frame_type == KEY_FRAME) filt_guess -= 4;
462 #if CONFIG_LOOPFILTER_LEVEL
463 lf->filter_level[0] = clamp(filt_guess, min_filter_level, max_filter_level);
464 lf->filter_level[1] = clamp(filt_guess, min_filter_level, max_filter_level);
465 #else
466 lf->filter_level = clamp(filt_guess, min_filter_level, max_filter_level);
467 #endif
468 } else {
469 #if CONFIG_LPF_SB
470 int mi_row, mi_col;
471 // TODO(chengchen): init last_lvl using previous frame's info?
472 int last_lvl = 0;
473 // TODO(chengchen): if the frame size makes the last superblock very small,
474 // consider merge it to the previous superblock to save bits.
475 // Example, if frame size 1080x720, then in the last row of superblock,
476 // there're (FILT_BOUNDAR_OFFSET + 16) pixels.
477 for (mi_row = 0; mi_row < cm->mi_rows; mi_row += MAX_MIB_SIZE) {
478 for (mi_col = 0; mi_col < cm->mi_cols; mi_col += MAX_MIB_SIZE) {
479 int lvl =
480 search_filter_level(sd, cpi, 1, NULL, mi_row, mi_col, last_lvl);
481
482 av1_loop_filter_sb_level_init(cm, mi_row, mi_col, lvl);
483
484 // For the superblock at row start, its previous filter level should be
485 // the one above it, not the one at the end of last row
486 if (mi_col + MAX_MIB_SIZE >= cm->mi_cols) {
487 last_lvl = cm->mi_grid_visible[mi_row * cm->mi_stride]->mbmi.filt_lvl;
488 } else {
489 last_lvl = lvl;
490 }
491 }
492 }
493 #else // CONFIG_LPF_SB
494 #if CONFIG_LOOPFILTER_LEVEL
495 lf->filter_level[0] = lf->filter_level[1] = search_filter_level(
496 sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, NULL, 0, 2);
497 lf->filter_level[0] = search_filter_level(
498 sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, NULL, 0, 0);
499 lf->filter_level[1] = search_filter_level(
500 sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, NULL, 0, 1);
501
502 lf->filter_level_u = search_filter_level(
503 sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, NULL, 1, 0);
504 lf->filter_level_v = search_filter_level(
505 sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, NULL, 2, 0);
506 #else
507 lf->filter_level =
508 search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, NULL);
509 #endif // CONFIG_LOOPFILTER_LEVEL
510 #endif // CONFIG_LPF_SB
511 }
512 }
513