summaryrefslogtreecommitdiffstats
path: root/third_party/aom/av1/encoder/av1_temporal_denoiser.c
blob: d4a1625612eb02a47656e65476fc47870d7095af (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
/*
 * Copyright (c) 2020, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 */

#include <assert.h>
#include <limits.h>
#include <math.h>

#include "config/aom_dsp_rtcd.h"
#include "aom_dsp/aom_dsp_common.h"
#include "aom_scale/yv12config.h"
#include "aom/aom_integer.h"
#include "av1/common/reconinter.h"
#include "av1/encoder/reconinter_enc.h"
#include "av1/encoder/context_tree.h"
#include "av1/encoder/av1_temporal_denoiser.h"
#include "av1/encoder/encoder.h"

#ifdef OUTPUT_YUV_DENOISED
static void make_grayscale(YV12_BUFFER_CONFIG *yuv);
#endif

static int absdiff_thresh(BLOCK_SIZE bs, int increase_denoising) {
  (void)bs;
  return 3 + (increase_denoising ? 1 : 0);
}

static int delta_thresh(BLOCK_SIZE bs, int increase_denoising) {
  (void)bs;
  (void)increase_denoising;
  return 4;
}

static int noise_motion_thresh(BLOCK_SIZE bs, int increase_denoising) {
  (void)bs;
  (void)increase_denoising;
  return 625;
}

static unsigned int sse_thresh(BLOCK_SIZE bs, int increase_denoising) {
  return (1 << num_pels_log2_lookup[bs]) * (increase_denoising ? 80 : 40);
}

static int sse_diff_thresh(BLOCK_SIZE bs, int increase_denoising,
                           int motion_magnitude) {
  if (motion_magnitude > noise_motion_thresh(bs, increase_denoising)) {
    if (increase_denoising)
      return (1 << num_pels_log2_lookup[bs]) << 2;
    else
      return 0;
  } else {
    return (1 << num_pels_log2_lookup[bs]) << 4;
  }
}

static int total_adj_weak_thresh(BLOCK_SIZE bs, int increase_denoising) {
  return (1 << num_pels_log2_lookup[bs]) * (increase_denoising ? 3 : 2);
}

// TODO(kyslov): If increase_denoising is enabled in the future,
// we might need to update the code for calculating 'total_adj' in
// case the C code is not bit-exact with corresponding sse2 code.
int av1_denoiser_filter_c(const uint8_t *sig, int sig_stride,
                          const uint8_t *mc_avg, int mc_avg_stride,
                          uint8_t *avg, int avg_stride, int increase_denoising,
                          BLOCK_SIZE bs, int motion_magnitude) {
  int r, c;
  const uint8_t *sig_start = sig;
  const uint8_t *mc_avg_start = mc_avg;
  uint8_t *avg_start = avg;
  int diff, adj, absdiff, delta;
  int adj_val[] = { 3, 4, 6 };
  int total_adj = 0;
  int shift_inc = 1;

  // If motion_magnitude is small, making the denoiser more aggressive by
  // increasing the adjustment for each level. Add another increment for
  // blocks that are labeled for increase denoising.
  if (motion_magnitude <= MOTION_MAGNITUDE_THRESHOLD) {
    if (increase_denoising) {
      shift_inc = 2;
    }
    adj_val[0] += shift_inc;
    adj_val[1] += shift_inc;
    adj_val[2] += shift_inc;
  }

  // First attempt to apply a strong temporal denoising filter.
  for (r = 0; r < block_size_high[bs]; ++r) {
    for (c = 0; c < block_size_wide[bs]; ++c) {
      diff = mc_avg[c] - sig[c];
      absdiff = abs(diff);

      if (absdiff <= absdiff_thresh(bs, increase_denoising)) {
        avg[c] = mc_avg[c];
        total_adj += diff;
      } else {
        switch (absdiff) {
          case 4:
          case 5:
          case 6:
          case 7: adj = adj_val[0]; break;
          case 8:
          case 9:
          case 10:
          case 11:
          case 12:
          case 13:
          case 14:
          case 15: adj = adj_val[1]; break;
          default: adj = adj_val[2];
        }
        if (diff > 0) {
          avg[c] = AOMMIN(UINT8_MAX, sig[c] + adj);
          total_adj += adj;
        } else {
          avg[c] = AOMMAX(0, sig[c] - adj);
          total_adj -= adj;
        }
      }
    }
    sig += sig_stride;
    avg += avg_stride;
    mc_avg += mc_avg_stride;
  }

  // If the strong filter did not modify the signal too much, we're all set.
  if (abs(total_adj) <= total_adj_strong_thresh(bs, increase_denoising)) {
    return FILTER_BLOCK;
  }

  // Otherwise, we try to dampen the filter if the delta is not too high.
  delta = ((abs(total_adj) - total_adj_strong_thresh(bs, increase_denoising)) >>
           num_pels_log2_lookup[bs]) +
          1;

  if (delta >= delta_thresh(bs, increase_denoising)) {
    return COPY_BLOCK;
  }

  mc_avg = mc_avg_start;
  avg = avg_start;
  sig = sig_start;
  for (r = 0; r < block_size_high[bs]; ++r) {
    for (c = 0; c < block_size_wide[bs]; ++c) {
      diff = mc_avg[c] - sig[c];
      adj = abs(diff);
      if (adj > delta) {
        adj = delta;
      }
      if (diff > 0) {
        // Diff positive means we made positive adjustment above
        // (in first try/attempt), so now make negative adjustment to bring
        // denoised signal down.
        avg[c] = AOMMAX(0, avg[c] - adj);
        total_adj -= adj;
      } else {
        // Diff negative means we made negative adjustment above
        // (in first try/attempt), so now make positive adjustment to bring
        // denoised signal up.
        avg[c] = AOMMIN(UINT8_MAX, avg[c] + adj);
        total_adj += adj;
      }
    }
    sig += sig_stride;
    avg += avg_stride;
    mc_avg += mc_avg_stride;
  }

  // We can use the filter if it has been sufficiently dampened
  if (abs(total_adj) <= total_adj_weak_thresh(bs, increase_denoising)) {
    return FILTER_BLOCK;
  }
  return COPY_BLOCK;
}

static uint8_t *block_start(uint8_t *framebuf, int stride, int mi_row,
                            int mi_col) {
  return framebuf + (stride * mi_row << 2) + (mi_col << 2);
}

static AV1_DENOISER_DECISION perform_motion_compensation(
    AV1_COMMON *const cm, AV1_DENOISER *denoiser, MACROBLOCK *mb, BLOCK_SIZE bs,
    int increase_denoising, int mi_row, int mi_col, PICK_MODE_CONTEXT *ctx,
    int motion_magnitude, int *zeromv_filter, int num_spatial_layers, int width,
    int lst_fb_idx, int gld_fb_idx, int use_svc, int spatial_layer,
    int use_gf_temporal_ref) {
  const int sse_diff = (ctx->newmv_sse == UINT_MAX)
                           ? 0
                           : ((int)ctx->zeromv_sse - (int)ctx->newmv_sse);
  int frame;
  int denoise_layer_idx = 0;
  MACROBLOCKD *filter_mbd = &mb->e_mbd;
  MB_MODE_INFO *mi = filter_mbd->mi[0];
  MB_MODE_INFO saved_mi;
  int i;
  struct buf_2d saved_dst[MAX_MB_PLANE];
  struct buf_2d saved_pre[MAX_MB_PLANE];
  // const RefBuffer *saved_block_refs[2];
  MV_REFERENCE_FRAME saved_frame;

  frame = ctx->best_reference_frame;

  saved_mi = *mi;

  // Avoid denoising small blocks. When noise > kDenLow or frame width > 480,
  // denoise 16x16 blocks.
  if (bs == BLOCK_8X8 || bs == BLOCK_8X16 || bs == BLOCK_16X8 ||
      (bs == BLOCK_16X16 && width > 480 &&
       denoiser->denoising_level <= kDenLow))
    return COPY_BLOCK;

  // If the best reference frame uses inter-prediction and there is enough of a
  // difference in sum-squared-error, use it.
  if (frame != INTRA_FRAME && frame != ALTREF_FRAME && frame != GOLDEN_FRAME &&
      sse_diff > sse_diff_thresh(bs, increase_denoising, motion_magnitude)) {
    mi->ref_frame[0] = ctx->best_reference_frame;
    mi->mode = ctx->best_sse_inter_mode;
    mi->mv[0] = ctx->best_sse_mv;
  } else {
    // Otherwise, use the zero reference frame.
    frame = ctx->best_zeromv_reference_frame;
    ctx->newmv_sse = ctx->zeromv_sse;
    // Bias to last reference.
    if ((num_spatial_layers > 1 && !use_gf_temporal_ref) ||
        frame == ALTREF_FRAME ||
        (frame == GOLDEN_FRAME && use_gf_temporal_ref) ||
        (frame != LAST_FRAME &&
         ((ctx->zeromv_lastref_sse < (5 * ctx->zeromv_sse) >> 2) ||
          denoiser->denoising_level >= kDenHigh))) {
      frame = LAST_FRAME;
      ctx->newmv_sse = ctx->zeromv_lastref_sse;
    }
    mi->ref_frame[0] = frame;
    mi->mode = GLOBALMV;
    mi->mv[0].as_int = 0;
    ctx->best_sse_inter_mode = GLOBALMV;
    ctx->best_sse_mv.as_int = 0;
    *zeromv_filter = 1;
    if (denoiser->denoising_level > kDenMedium) {
      motion_magnitude = 0;
    }
  }

  saved_frame = frame;
  // When using SVC, we need to map REF_FRAME to the frame buffer index.
  if (use_svc) {
    if (frame == LAST_FRAME)
      frame = lst_fb_idx + 1;
    else if (frame == GOLDEN_FRAME)
      frame = gld_fb_idx + 1;
    // Shift for the second spatial layer.
    if (num_spatial_layers - spatial_layer == 2)
      frame = frame + denoiser->num_ref_frames;
    denoise_layer_idx = num_spatial_layers - spatial_layer - 1;
  }

  // Force copy (no denoise, copy source in denoised buffer) if
  // running_avg_y[frame] is NULL.
  if (denoiser->running_avg_y[frame].buffer_alloc == NULL) {
    // Restore everything to its original state
    *mi = saved_mi;
    return COPY_BLOCK;
  }

  if (ctx->newmv_sse > sse_thresh(bs, increase_denoising)) {
    // Restore everything to its original state
    *mi = saved_mi;
    return COPY_BLOCK;
  }
  if (motion_magnitude > (noise_motion_thresh(bs, increase_denoising) << 3)) {
    // Restore everything to its original state
    *mi = saved_mi;
    return COPY_BLOCK;
  }

  // We will restore these after motion compensation.
  for (i = 0; i < MAX_MB_PLANE; ++i) {
    saved_pre[i] = filter_mbd->plane[i].pre[0];
    saved_dst[i] = filter_mbd->plane[i].dst;
  }

  // Set the pointers in the MACROBLOCKD to point to the buffers in the denoiser
  // struct.
  set_ref_ptrs(cm, filter_mbd, saved_frame, NONE);
  av1_setup_pre_planes(filter_mbd, 0, &(denoiser->running_avg_y[frame]), mi_row,
                       mi_col, filter_mbd->block_ref_scale_factors[0], 1);
  av1_setup_dst_planes(filter_mbd->plane, bs,
                       &(denoiser->mc_running_avg_y[denoise_layer_idx]), mi_row,
                       mi_col, 0, 1);

  av1_enc_build_inter_predictor_y(filter_mbd, mi_row, mi_col);

  // Restore everything to its original state
  *mi = saved_mi;
  for (i = 0; i < MAX_MB_PLANE; ++i) {
    filter_mbd->plane[i].pre[0] = saved_pre[i];
    filter_mbd->plane[i].dst = saved_dst[i];
  }

  return FILTER_BLOCK;
}

void av1_denoiser_denoise(AV1_COMP *cpi, MACROBLOCK *mb, int mi_row, int mi_col,
                          BLOCK_SIZE bs, PICK_MODE_CONTEXT *ctx,
                          AV1_DENOISER_DECISION *denoiser_decision,
                          int use_gf_temporal_ref) {
  int mv_col, mv_row;
  int motion_magnitude = 0;
  int zeromv_filter = 0;
  AV1_DENOISER *denoiser = &cpi->denoiser;
  AV1_DENOISER_DECISION decision = COPY_BLOCK;

  const int shift =
      cpi->svc.number_spatial_layers - cpi->svc.spatial_layer_id == 2
          ? denoiser->num_ref_frames
          : 0;
  YV12_BUFFER_CONFIG avg = denoiser->running_avg_y[INTRA_FRAME + shift];
  const int denoise_layer_index =
      cpi->svc.number_spatial_layers - cpi->svc.spatial_layer_id - 1;
  YV12_BUFFER_CONFIG mc_avg = denoiser->mc_running_avg_y[denoise_layer_index];
  uint8_t *avg_start = block_start(avg.y_buffer, avg.y_stride, mi_row, mi_col);

  uint8_t *mc_avg_start =
      block_start(mc_avg.y_buffer, mc_avg.y_stride, mi_row, mi_col);
  struct buf_2d src = mb->plane[0].src;
  int increase_denoising = 0;
  int last_is_reference = cpi->ref_frame_flags & AOM_LAST_FLAG;
  mv_col = ctx->best_sse_mv.as_mv.col;
  mv_row = ctx->best_sse_mv.as_mv.row;
  motion_magnitude = mv_row * mv_row + mv_col * mv_col;

  if (denoiser->denoising_level == kDenHigh) increase_denoising = 1;

  // Copy block if LAST_FRAME is not a reference.
  // Last doesn't always exist when SVC layers are dynamically changed, e.g. top
  // spatial layer doesn't have last reference when it's brought up for the
  // first time on the fly.
  if (last_is_reference && denoiser->denoising_level >= kDenLow &&
      !ctx->sb_skip_denoising)
    decision = perform_motion_compensation(
        &cpi->common, denoiser, mb, bs, increase_denoising, mi_row, mi_col, ctx,
        motion_magnitude, &zeromv_filter, cpi->svc.number_spatial_layers,
        cpi->source->y_width, cpi->ppi->rtc_ref.ref_idx[0],
        cpi->ppi->rtc_ref.ref_idx[3], cpi->ppi->use_svc,
        cpi->svc.spatial_layer_id, use_gf_temporal_ref);

  if (decision == FILTER_BLOCK) {
    decision = av1_denoiser_filter(src.buf, src.stride, mc_avg_start,
                                   mc_avg.y_stride, avg_start, avg.y_stride,
                                   increase_denoising, bs, motion_magnitude);
  }

  if (decision == FILTER_BLOCK) {
    aom_convolve_copy(avg_start, avg.y_stride, src.buf, src.stride,
                      block_size_wide[bs], block_size_high[bs]);
  } else {  // COPY_BLOCK
    aom_convolve_copy(src.buf, src.stride, avg_start, avg.y_stride,
                      block_size_wide[bs], block_size_high[bs]);
  }
  *denoiser_decision = decision;
  if (decision == FILTER_BLOCK && zeromv_filter == 1)
    *denoiser_decision = FILTER_ZEROMV_BLOCK;
}

static void copy_frame(YV12_BUFFER_CONFIG *const dest,
                       const YV12_BUFFER_CONFIG *const src) {
  int r;
  const uint8_t *srcbuf = src->y_buffer;
  uint8_t *destbuf = dest->y_buffer;

  assert(dest->y_width == src->y_width);
  assert(dest->y_height == src->y_height);

  for (r = 0; r < dest->y_height; ++r) {
    memcpy(destbuf, srcbuf, dest->y_width);
    destbuf += dest->y_stride;
    srcbuf += src->y_stride;
  }
}

static void swap_frame_buffer(YV12_BUFFER_CONFIG *const dest,
                              YV12_BUFFER_CONFIG *const src) {
  uint8_t *tmp_buf = dest->y_buffer;
  assert(dest->y_width == src->y_width);
  assert(dest->y_height == src->y_height);
  dest->y_buffer = src->y_buffer;
  src->y_buffer = tmp_buf;
}

void av1_denoiser_update_frame_info(
    AV1_DENOISER *denoiser, YV12_BUFFER_CONFIG src, struct RTC_REF *rtc_ref,
    struct SVC *svc, FRAME_TYPE frame_type, int refresh_alt_ref_frame,
    int refresh_golden_frame, int refresh_last_frame, int alt_fb_idx,
    int gld_fb_idx, int lst_fb_idx, int resized,
    int svc_refresh_denoiser_buffers, int second_spatial_layer) {
  const int shift = second_spatial_layer ? denoiser->num_ref_frames : 0;
  // Copy source into denoised reference buffers on KEY_FRAME or
  // if the just encoded frame was resized. For SVC, copy source if the base
  // spatial layer was key frame.
  if (frame_type == KEY_FRAME || resized != 0 || denoiser->reset ||
      svc_refresh_denoiser_buffers) {
    int i;
    // Start at 1 so as not to overwrite the INTRA_FRAME
    for (i = 1; i < denoiser->num_ref_frames; ++i) {
      if (denoiser->running_avg_y[i + shift].buffer_alloc != NULL)
        copy_frame(&denoiser->running_avg_y[i + shift], &src);
    }
    denoiser->reset = 0;
    return;
  }

  if (rtc_ref->set_ref_frame_config) {
    int i;
    for (i = 0; i < REF_FRAMES; i++) {
      if (rtc_ref->refresh[svc->spatial_layer_id] & (1 << i))
        copy_frame(&denoiser->running_avg_y[i + 1 + shift],
                   &denoiser->running_avg_y[INTRA_FRAME + shift]);
    }
  } else {
    // If more than one refresh occurs, must copy frame buffer.
    if ((refresh_alt_ref_frame + refresh_golden_frame + refresh_last_frame) >
        1) {
      if (refresh_alt_ref_frame) {
        copy_frame(&denoiser->running_avg_y[alt_fb_idx + 1 + shift],
                   &denoiser->running_avg_y[INTRA_FRAME + shift]);
      }
      if (refresh_golden_frame) {
        copy_frame(&denoiser->running_avg_y[gld_fb_idx + 1 + shift],
                   &denoiser->running_avg_y[INTRA_FRAME + shift]);
      }
      if (refresh_last_frame) {
        copy_frame(&denoiser->running_avg_y[lst_fb_idx + 1 + shift],
                   &denoiser->running_avg_y[INTRA_FRAME + shift]);
      }
    } else {
      if (refresh_alt_ref_frame) {
        swap_frame_buffer(&denoiser->running_avg_y[alt_fb_idx + 1 + shift],
                          &denoiser->running_avg_y[INTRA_FRAME + shift]);
      }
      if (refresh_golden_frame) {
        swap_frame_buffer(&denoiser->running_avg_y[gld_fb_idx + 1 + shift],
                          &denoiser->running_avg_y[INTRA_FRAME + shift]);
      }
      if (refresh_last_frame) {
        swap_frame_buffer(&denoiser->running_avg_y[lst_fb_idx + 1 + shift],
                          &denoiser->running_avg_y[INTRA_FRAME + shift]);
      }
    }
  }
}

void av1_denoiser_reset_frame_stats(PICK_MODE_CONTEXT *ctx) {
  ctx->zeromv_sse = INT64_MAX;
  ctx->newmv_sse = INT64_MAX;
  ctx->zeromv_lastref_sse = INT64_MAX;
  ctx->best_sse_mv.as_int = 0;
}

void av1_denoiser_update_frame_stats(MB_MODE_INFO *mi, int64_t sse,
                                     PREDICTION_MODE mode,
                                     PICK_MODE_CONTEXT *ctx) {
  if (mi->mv[0].as_int == 0 && sse < ctx->zeromv_sse) {
    ctx->zeromv_sse = sse;
    ctx->best_zeromv_reference_frame = mi->ref_frame[0];
    if (mi->ref_frame[0] == LAST_FRAME) ctx->zeromv_lastref_sse = sse;
  }

  if (mi->mv[0].as_int != 0 && sse < ctx->newmv_sse) {
    ctx->newmv_sse = sse;
    ctx->best_sse_inter_mode = mode;
    ctx->best_sse_mv = mi->mv[0];
    ctx->best_reference_frame = mi->ref_frame[0];
  }
}

static int av1_denoiser_realloc_svc_helper(AV1_COMMON *cm,
                                           AV1_DENOISER *denoiser, int fb_idx) {
  int fail = 0;
  if (denoiser->running_avg_y[fb_idx].buffer_alloc == NULL) {
    fail = aom_alloc_frame_buffer(
        &denoiser->running_avg_y[fb_idx], cm->width, cm->height,
        cm->seq_params->subsampling_x, cm->seq_params->subsampling_y,
        cm->seq_params->use_highbitdepth, AOM_BORDER_IN_PIXELS,
        cm->features.byte_alignment, false, 0);
    if (fail) {
      av1_denoiser_free(denoiser);
      return 1;
    }
  }
  return 0;
}

int av1_denoiser_realloc_svc(AV1_COMMON *cm, AV1_DENOISER *denoiser,
                             struct RTC_REF *rtc_ref, struct SVC *svc,
                             int svc_buf_shift, int refresh_alt,
                             int refresh_gld, int refresh_lst, int alt_fb_idx,
                             int gld_fb_idx, int lst_fb_idx) {
  int fail = 0;
  if (rtc_ref->set_ref_frame_config) {
    int i;
    for (i = 0; i < REF_FRAMES; i++) {
      if (cm->current_frame.frame_type == KEY_FRAME ||
          rtc_ref->refresh[svc->spatial_layer_id] & (1 << i)) {
        fail = av1_denoiser_realloc_svc_helper(cm, denoiser,
                                               i + 1 + svc_buf_shift);
      }
    }
  } else {
    if (refresh_alt) {
      // Increase the frame buffer index by 1 to map it to the buffer index in
      // the denoiser.
      fail = av1_denoiser_realloc_svc_helper(cm, denoiser,
                                             alt_fb_idx + 1 + svc_buf_shift);
      if (fail) return 1;
    }
    if (refresh_gld) {
      fail = av1_denoiser_realloc_svc_helper(cm, denoiser,
                                             gld_fb_idx + 1 + svc_buf_shift);
      if (fail) return 1;
    }
    if (refresh_lst) {
      fail = av1_denoiser_realloc_svc_helper(cm, denoiser,
                                             lst_fb_idx + 1 + svc_buf_shift);
      if (fail) return 1;
    }
  }
  return 0;
}

int av1_denoiser_alloc(AV1_COMMON *cm, struct SVC *svc, AV1_DENOISER *denoiser,
                       int use_svc, int noise_sen, int width, int height,
                       int ssx, int ssy, int use_highbitdepth, int border) {
  int i, layer, fail, init_num_ref_frames;
  const int legacy_byte_alignment = 0;
  int num_layers = 1;
  int scaled_width = width;
  int scaled_height = height;
  if (use_svc) {
    LAYER_CONTEXT *lc = &svc->layer_context[svc->spatial_layer_id *
                                                svc->number_temporal_layers +
                                            svc->temporal_layer_id];
    av1_get_layer_resolution(width, height, lc->scaling_factor_num,
                             lc->scaling_factor_den, &scaled_width,
                             &scaled_height);
    // For SVC: only denoise at most 2 spatial (highest) layers.
    if (noise_sen >= 2)
      // Denoise from one spatial layer below the top.
      svc->first_layer_denoise = AOMMAX(svc->number_spatial_layers - 2, 0);
    else
      // Only denoise the top spatial layer.
      svc->first_layer_denoise = AOMMAX(svc->number_spatial_layers - 1, 0);
    num_layers = svc->number_spatial_layers - svc->first_layer_denoise;
  }
  assert(denoiser != NULL);
  denoiser->num_ref_frames = use_svc ? SVC_REF_FRAMES : NONSVC_REF_FRAMES;
  init_num_ref_frames = use_svc ? REF_FRAMES : NONSVC_REF_FRAMES;
  denoiser->num_layers = num_layers;
  CHECK_MEM_ERROR(cm, denoiser->running_avg_y,
                  aom_calloc(denoiser->num_ref_frames * num_layers,
                             sizeof(denoiser->running_avg_y[0])));
  CHECK_MEM_ERROR(
      cm, denoiser->mc_running_avg_y,
      aom_calloc(num_layers, sizeof(denoiser->mc_running_avg_y[0])));

  for (layer = 0; layer < num_layers; ++layer) {
    const int denoise_width = (layer == 0) ? width : scaled_width;
    const int denoise_height = (layer == 0) ? height : scaled_height;
    for (i = 0; i < init_num_ref_frames; ++i) {
      fail = aom_alloc_frame_buffer(
          &denoiser->running_avg_y[i + denoiser->num_ref_frames * layer],
          denoise_width, denoise_height, ssx, ssy, use_highbitdepth, border,
          legacy_byte_alignment, false, 0);
      if (fail) {
        av1_denoiser_free(denoiser);
        return 1;
      }
#ifdef OUTPUT_YUV_DENOISED
      make_grayscale(&denoiser->running_avg_y[i]);
#endif
    }

    fail = aom_alloc_frame_buffer(
        &denoiser->mc_running_avg_y[layer], denoise_width, denoise_height, ssx,
        ssy, use_highbitdepth, border, legacy_byte_alignment, false, 0);
    if (fail) {
      av1_denoiser_free(denoiser);
      return 1;
    }
  }

  // denoiser->last_source only used for noise_estimation, so only for top
  // layer.
  fail = aom_alloc_frame_buffer(&denoiser->last_source, width, height, ssx, ssy,
                                use_highbitdepth, border, legacy_byte_alignment,
                                false, 0);
  if (fail) {
    av1_denoiser_free(denoiser);
    return 1;
  }
#ifdef OUTPUT_YUV_DENOISED
  make_grayscale(&denoiser->running_avg_y[i]);
#endif
  denoiser->frame_buffer_initialized = 1;
  denoiser->denoising_level = kDenMedium;
  denoiser->prev_denoising_level = kDenMedium;
  denoiser->reset = 0;
  denoiser->current_denoiser_frame = 0;
  return 0;
}

void av1_denoiser_free(AV1_DENOISER *denoiser) {
  int i;
  if (denoiser == NULL) {
    return;
  }
  denoiser->frame_buffer_initialized = 0;
  for (i = 0; i < denoiser->num_ref_frames * denoiser->num_layers; ++i) {
    aom_free_frame_buffer(&denoiser->running_avg_y[i]);
  }
  aom_free(denoiser->running_avg_y);
  denoiser->running_avg_y = NULL;

  for (i = 0; i < denoiser->num_layers; ++i) {
    aom_free_frame_buffer(&denoiser->mc_running_avg_y[i]);
  }

  aom_free(denoiser->mc_running_avg_y);
  denoiser->mc_running_avg_y = NULL;
  aom_free_frame_buffer(&denoiser->last_source);
}

// TODO(kyslov) Enable when SVC temporal denosing is implemented
#if 0
static void force_refresh_longterm_ref(AV1_COMP *const cpi) {
  SVC *const svc = &cpi->svc;
  // If long term reference is used, force refresh of that slot, so
  // denoiser buffer for long term reference stays in sync.
  if (svc->use_gf_temporal_ref_current_layer) {
    int index = svc->spatial_layer_id;
    if (svc->number_spatial_layers == 3) index = svc->spatial_layer_id - 1;
    assert(index >= 0);
    cpi->alt_fb_idx = svc->buffer_gf_temporal_ref[index].idx;
    cpi->refresh_alt_ref_frame = 1;
  }
}
#endif

void av1_denoiser_set_noise_level(AV1_COMP *const cpi, int noise_level) {
  AV1_DENOISER *const denoiser = &cpi->denoiser;
  denoiser->denoising_level = noise_level;
  if (denoiser->denoising_level > kDenLowLow &&
      denoiser->prev_denoising_level == kDenLowLow) {
    denoiser->reset = 1;
// TODO(kyslov) Enable when SVC temporal denosing is implemented
#if 0
    force_refresh_longterm_ref(cpi);
#endif
  } else {
    denoiser->reset = 0;
  }
  denoiser->prev_denoising_level = denoiser->denoising_level;
}

// Scale/increase the partition threshold
// for denoiser speed-up.
int64_t av1_scale_part_thresh(int64_t threshold, AV1_DENOISER_LEVEL noise_level,
                              CONTENT_STATE_SB content_state,
                              int temporal_layer_id) {
  if ((content_state.source_sad_nonrd <= kLowSad &&
       content_state.low_sumdiff) ||
      (content_state.source_sad_nonrd == kHighSad &&
       content_state.low_sumdiff) ||
      (content_state.lighting_change && !content_state.low_sumdiff) ||
      (noise_level == kDenHigh) || (temporal_layer_id != 0)) {
    int64_t scaled_thr =
        (temporal_layer_id < 2) ? (3 * threshold) >> 1 : (7 * threshold) >> 2;
    return scaled_thr;
  } else {
    return (5 * threshold) >> 2;
  }
}

//  Scale/increase the ac skip threshold for
//  denoiser speed-up.
int64_t av1_scale_acskip_thresh(int64_t threshold,
                                AV1_DENOISER_LEVEL noise_level, int abs_sumdiff,
                                int temporal_layer_id) {
  if (noise_level >= kDenLow && abs_sumdiff < 5)
    threshold *= (noise_level == kDenLow)   ? 2
                 : (temporal_layer_id == 2) ? 10
                                            : 6;
  return threshold;
}

void av1_denoiser_reset_on_first_frame(AV1_COMP *const cpi) {
  if (/*av1_denoise_svc_non_key(cpi) &&*/
      cpi->denoiser.current_denoiser_frame == 0) {
    cpi->denoiser.reset = 1;
// TODO(kyslov) Enable when SVC temporal denosing is implemented
#if 0
    force_refresh_longterm_ref(cpi);
#endif
  }
}

void av1_denoiser_update_ref_frame(AV1_COMP *const cpi) {
  AV1_COMMON *const cm = &cpi->common;
  RTC_REF *const rtc_ref = &cpi->ppi->rtc_ref;
  SVC *const svc = &cpi->svc;

  if (cpi->oxcf.noise_sensitivity > 0 && denoise_svc(cpi) &&
      cpi->denoiser.denoising_level > kDenLowLow) {
    int svc_refresh_denoiser_buffers = 0;
    int denoise_svc_second_layer = 0;
    FRAME_TYPE frame_type = cm->current_frame.frame_type == INTRA_ONLY_FRAME
                                ? KEY_FRAME
                                : cm->current_frame.frame_type;
    cpi->denoiser.current_denoiser_frame++;
    const int resize_pending = is_frame_resize_pending(cpi);

    if (cpi->ppi->use_svc) {
// TODO(kyslov) Enable when SVC temporal denosing is implemented
#if 0
      const int svc_buf_shift =
          svc->number_spatial_layers - svc->spatial_layer_id == 2
              ? cpi->denoiser.num_ref_frames
              : 0;
      int layer =
          LAYER_IDS_TO_IDX(svc->spatial_layer_id, svc->temporal_layer_id,
                           svc->number_temporal_layers);
      LAYER_CONTEXT *const lc = &svc->layer_context[layer];
      svc_refresh_denoiser_buffers =
          lc->is_key_frame || svc->spatial_layer_sync[svc->spatial_layer_id];
      denoise_svc_second_layer =
          svc->number_spatial_layers - svc->spatial_layer_id == 2 ? 1 : 0;
      // Check if we need to allocate extra buffers in the denoiser
      // for refreshed frames.
      if (av1_denoiser_realloc_svc(cm, &cpi->denoiser, rtc_ref,
                                   svc, svc_buf_shift,
                                   cpi->refresh_alt_ref_frame,
                                   cpi->refresh_golden_frame,
                                   cpi->refresh_last_frame, cpi->alt_fb_idx,
                                   cpi->gld_fb_idx, cpi->lst_fb_idx))
        aom_internal_error(cm->error, AOM_CODEC_MEM_ERROR,
                           "Failed to re-allocate denoiser for SVC");
#endif
    }
    av1_denoiser_update_frame_info(
        &cpi->denoiser, *cpi->source, rtc_ref, svc, frame_type,
        cpi->refresh_frame.alt_ref_frame, cpi->refresh_frame.golden_frame, 1,
        rtc_ref->ref_idx[6], rtc_ref->ref_idx[3], rtc_ref->ref_idx[0],
        resize_pending, svc_refresh_denoiser_buffers, denoise_svc_second_layer);
  }
}

#ifdef OUTPUT_YUV_DENOISED
static void make_grayscale(YV12_BUFFER_CONFIG *yuv) {
  int r, c;
  uint8_t *u = yuv->u_buffer;
  uint8_t *v = yuv->v_buffer;

  for (r = 0; r < yuv->uv_height; ++r) {
    for (c = 0; c < yuv->uv_width; ++c) {
      u[c] = UINT8_MAX / 2;
      v[c] = UINT8_MAX / 2;
    }
    u += yuv->uv_stride;
    v += yuv->uv_stride;
  }
}

void aom_write_yuv_frame(FILE *yuv_file, YV12_BUFFER_CONFIG *s) {
  unsigned char *src = s->y_buffer;
  int h = s->y_crop_height;

  do {
    fwrite(src, s->y_width, 1, yuv_file);
    src += s->y_stride;
  } while (--h);

  src = s->u_buffer;
  h = s->uv_crop_height;

  do {
    fwrite(src, s->uv_width, 1, yuv_file);
    src += s->uv_stride;
  } while (--h);

  src = s->v_buffer;
  h = s->uv_crop_height;

  do {
    fwrite(src, s->uv_width, 1, yuv_file);
    src += s->uv_stride;
  } while (--h);
}
#endif