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 <limits.h>
13 #include <math.h>
14 #include <stdio.h>
15
16 #include "config/aom_dsp_rtcd.h"
17 #include "config/aom_scale_rtcd.h"
18
19 #include "aom_dsp/aom_dsp_common.h"
20 #include "aom_mem/aom_mem.h"
21 #include "aom_ports/mem.h"
22 #include "aom_ports/system_state.h"
23 #include "aom_scale/aom_scale.h"
24 #include "aom_scale/yv12config.h"
25
26 #include "aom_dsp/variance.h"
27 #include "av1/common/entropymv.h"
28 #include "av1/common/quant_common.h"
29 #include "av1/common/reconinter.h" // av1_setup_dst_planes()
30 #include "av1/common/txb_common.h"
31 #include "av1/encoder/aq_variance.h"
32 #include "av1/encoder/av1_quantize.h"
33 #include "av1/encoder/block.h"
34 #include "av1/encoder/dwt.h"
35 #include "av1/encoder/encodeframe.h"
36 #include "av1/encoder/encodemb.h"
37 #include "av1/encoder/encodemv.h"
38 #include "av1/encoder/encoder.h"
39 #include "av1/encoder/extend.h"
40 #include "av1/encoder/firstpass.h"
41 #include "av1/encoder/mcomp.h"
42 #include "av1/encoder/rd.h"
43 #include "av1/encoder/reconinter_enc.h"
44
45 #define OUTPUT_FPF 0
46 #define ARF_STATS_OUTPUT 0
47
48 #define GROUP_ADAPTIVE_MAXQ 1
49
50 #define BOOST_BREAKOUT 12.5
51 #define BOOST_FACTOR 12.5
52 #define FACTOR_PT_LOW 0.70
53 #define FACTOR_PT_HIGH 0.90
54 #define FIRST_PASS_Q 10.0
55 #define GF_MAX_BOOST 90.0
56 #define INTRA_MODE_PENALTY 1024
57 #define KF_MIN_FRAME_BOOST 80.0
58 #define KF_MAX_FRAME_BOOST 128.0
59 #define MIN_ARF_GF_BOOST 240
60 #define MIN_DECAY_FACTOR 0.01
61 #define MIN_KF_BOOST 300
62 #define NEW_MV_MODE_PENALTY 32
63 #define DARK_THRESH 64
64 #define DEFAULT_GRP_WEIGHT 1.0
65 #define RC_FACTOR_MIN 0.75
66 #define RC_FACTOR_MAX 1.75
67 #define MIN_FWD_KF_INTERVAL 8
68
69 #define NCOUNT_INTRA_THRESH 8192
70 #define NCOUNT_INTRA_FACTOR 3
71 #define NCOUNT_FRAME_II_THRESH 5.0
72
73 #define DOUBLE_DIVIDE_CHECK(x) ((x) < 0 ? (x)-0.000001 : (x) + 0.000001)
74
75 #if ARF_STATS_OUTPUT
76 unsigned int arf_count = 0;
77 #endif
78
79 // Resets the first pass file to the given position using a relative seek from
80 // the current position.
reset_fpf_position(TWO_PASS * p,const FIRSTPASS_STATS * position)81 static void reset_fpf_position(TWO_PASS *p, const FIRSTPASS_STATS *position) {
82 p->stats_in = position;
83 }
84
85 // Read frame stats at an offset from the current position.
read_frame_stats(const TWO_PASS * p,int offset)86 static const FIRSTPASS_STATS *read_frame_stats(const TWO_PASS *p, int offset) {
87 if ((offset >= 0 && p->stats_in + offset >= p->stats_in_end) ||
88 (offset < 0 && p->stats_in + offset < p->stats_in_start)) {
89 return NULL;
90 }
91
92 return &p->stats_in[offset];
93 }
94
input_stats(TWO_PASS * p,FIRSTPASS_STATS * fps)95 static int input_stats(TWO_PASS *p, FIRSTPASS_STATS *fps) {
96 if (p->stats_in >= p->stats_in_end) return EOF;
97
98 *fps = *p->stats_in;
99 ++p->stats_in;
100 return 1;
101 }
102
output_stats(FIRSTPASS_STATS * stats,struct aom_codec_pkt_list * pktlist)103 static void output_stats(FIRSTPASS_STATS *stats,
104 struct aom_codec_pkt_list *pktlist) {
105 struct aom_codec_cx_pkt pkt;
106 pkt.kind = AOM_CODEC_STATS_PKT;
107 pkt.data.twopass_stats.buf = stats;
108 pkt.data.twopass_stats.sz = sizeof(FIRSTPASS_STATS);
109 aom_codec_pkt_list_add(pktlist, &pkt);
110
111 // TEMP debug code
112 #if OUTPUT_FPF
113 {
114 FILE *fpfile;
115 fpfile = fopen("firstpass.stt", "a");
116
117 fprintf(fpfile,
118 "%12.0lf %12.4lf %12.0lf %12.0lf %12.0lf %12.4lf %12.4lf"
119 "%12.4lf %12.4lf %12.4lf %12.4lf %12.4lf %12.4lf %12.4lf %12.4lf"
120 "%12.4lf %12.4lf %12.0lf %12.0lf %12.0lf %12.4lf %12.4lf\n",
121 stats->frame, stats->weight, stats->intra_error, stats->coded_error,
122 stats->sr_coded_error, stats->pcnt_inter, stats->pcnt_motion,
123 stats->pcnt_second_ref, stats->pcnt_neutral, stats->intra_skip_pct,
124 stats->inactive_zone_rows, stats->inactive_zone_cols, stats->MVr,
125 stats->mvr_abs, stats->MVc, stats->mvc_abs, stats->MVrv,
126 stats->MVcv, stats->mv_in_out_count, stats->new_mv_count,
127 stats->count, stats->duration);
128 fclose(fpfile);
129 }
130 #endif
131 }
132
133 #if CONFIG_FP_MB_STATS
output_fpmb_stats(uint8_t * this_frame_mb_stats,int stats_size,struct aom_codec_pkt_list * pktlist)134 static void output_fpmb_stats(uint8_t *this_frame_mb_stats, int stats_size,
135 struct aom_codec_pkt_list *pktlist) {
136 struct aom_codec_cx_pkt pkt;
137 pkt.kind = AOM_CODEC_FPMB_STATS_PKT;
138 pkt.data.firstpass_mb_stats.buf = this_frame_mb_stats;
139 pkt.data.firstpass_mb_stats.sz = stats_size * sizeof(*this_frame_mb_stats);
140 aom_codec_pkt_list_add(pktlist, &pkt);
141 }
142 #endif
143
zero_stats(FIRSTPASS_STATS * section)144 static void zero_stats(FIRSTPASS_STATS *section) {
145 section->frame = 0.0;
146 section->weight = 0.0;
147 section->intra_error = 0.0;
148 section->frame_avg_wavelet_energy = 0.0;
149 section->coded_error = 0.0;
150 section->sr_coded_error = 0.0;
151 section->pcnt_inter = 0.0;
152 section->pcnt_motion = 0.0;
153 section->pcnt_second_ref = 0.0;
154 section->pcnt_neutral = 0.0;
155 section->intra_skip_pct = 0.0;
156 section->inactive_zone_rows = 0.0;
157 section->inactive_zone_cols = 0.0;
158 section->MVr = 0.0;
159 section->mvr_abs = 0.0;
160 section->MVc = 0.0;
161 section->mvc_abs = 0.0;
162 section->MVrv = 0.0;
163 section->MVcv = 0.0;
164 section->mv_in_out_count = 0.0;
165 section->new_mv_count = 0.0;
166 section->count = 0.0;
167 section->duration = 1.0;
168 }
169
accumulate_stats(FIRSTPASS_STATS * section,const FIRSTPASS_STATS * frame)170 static void accumulate_stats(FIRSTPASS_STATS *section,
171 const FIRSTPASS_STATS *frame) {
172 section->frame += frame->frame;
173 section->weight += frame->weight;
174 section->intra_error += frame->intra_error;
175 section->frame_avg_wavelet_energy += frame->frame_avg_wavelet_energy;
176 section->coded_error += frame->coded_error;
177 section->sr_coded_error += frame->sr_coded_error;
178 section->pcnt_inter += frame->pcnt_inter;
179 section->pcnt_motion += frame->pcnt_motion;
180 section->pcnt_second_ref += frame->pcnt_second_ref;
181 section->pcnt_neutral += frame->pcnt_neutral;
182 section->intra_skip_pct += frame->intra_skip_pct;
183 section->inactive_zone_rows += frame->inactive_zone_rows;
184 section->inactive_zone_cols += frame->inactive_zone_cols;
185 section->MVr += frame->MVr;
186 section->mvr_abs += frame->mvr_abs;
187 section->MVc += frame->MVc;
188 section->mvc_abs += frame->mvc_abs;
189 section->MVrv += frame->MVrv;
190 section->MVcv += frame->MVcv;
191 section->mv_in_out_count += frame->mv_in_out_count;
192 section->new_mv_count += frame->new_mv_count;
193 section->count += frame->count;
194 section->duration += frame->duration;
195 }
196
subtract_stats(FIRSTPASS_STATS * section,const FIRSTPASS_STATS * frame)197 static void subtract_stats(FIRSTPASS_STATS *section,
198 const FIRSTPASS_STATS *frame) {
199 section->frame -= frame->frame;
200 section->weight -= frame->weight;
201 section->intra_error -= frame->intra_error;
202 section->frame_avg_wavelet_energy -= frame->frame_avg_wavelet_energy;
203 section->coded_error -= frame->coded_error;
204 section->sr_coded_error -= frame->sr_coded_error;
205 section->pcnt_inter -= frame->pcnt_inter;
206 section->pcnt_motion -= frame->pcnt_motion;
207 section->pcnt_second_ref -= frame->pcnt_second_ref;
208 section->pcnt_neutral -= frame->pcnt_neutral;
209 section->intra_skip_pct -= frame->intra_skip_pct;
210 section->inactive_zone_rows -= frame->inactive_zone_rows;
211 section->inactive_zone_cols -= frame->inactive_zone_cols;
212 section->MVr -= frame->MVr;
213 section->mvr_abs -= frame->mvr_abs;
214 section->MVc -= frame->MVc;
215 section->mvc_abs -= frame->mvc_abs;
216 section->MVrv -= frame->MVrv;
217 section->MVcv -= frame->MVcv;
218 section->mv_in_out_count -= frame->mv_in_out_count;
219 section->new_mv_count -= frame->new_mv_count;
220 section->count -= frame->count;
221 section->duration -= frame->duration;
222 }
223
224 // Calculate the linear size relative to a baseline of 1080P
225 #define BASE_SIZE 2073600.0 // 1920x1080
get_linear_size_factor(const AV1_COMP * cpi)226 static double get_linear_size_factor(const AV1_COMP *cpi) {
227 const double this_area = cpi->initial_width * cpi->initial_height;
228 return pow(this_area / BASE_SIZE, 0.5);
229 }
230
231 // Calculate an active area of the image that discounts formatting
232 // bars and partially discounts other 0 energy areas.
233 #define MIN_ACTIVE_AREA 0.5
234 #define MAX_ACTIVE_AREA 1.0
calculate_active_area(const AV1_COMP * cpi,const FIRSTPASS_STATS * this_frame)235 static double calculate_active_area(const AV1_COMP *cpi,
236 const FIRSTPASS_STATS *this_frame) {
237 double active_pct;
238
239 active_pct =
240 1.0 -
241 ((this_frame->intra_skip_pct / 2) +
242 ((this_frame->inactive_zone_rows * 2) / (double)cpi->common.mb_rows));
243 return fclamp(active_pct, MIN_ACTIVE_AREA, MAX_ACTIVE_AREA);
244 }
245
246 // Calculate a modified Error used in distributing bits between easier and
247 // harder frames.
248 #define ACT_AREA_CORRECTION 0.5
calculate_modified_err(const AV1_COMP * cpi,const TWO_PASS * twopass,const AV1EncoderConfig * oxcf,const FIRSTPASS_STATS * this_frame)249 static double calculate_modified_err(const AV1_COMP *cpi,
250 const TWO_PASS *twopass,
251 const AV1EncoderConfig *oxcf,
252 const FIRSTPASS_STATS *this_frame) {
253 const FIRSTPASS_STATS *const stats = &twopass->total_stats;
254 const double av_weight = stats->weight / stats->count;
255 const double av_err = (stats->coded_error * av_weight) / stats->count;
256 double modified_error =
257 av_err * pow(this_frame->coded_error * this_frame->weight /
258 DOUBLE_DIVIDE_CHECK(av_err),
259 oxcf->two_pass_vbrbias / 100.0);
260
261 // Correction for active area. Frames with a reduced active area
262 // (eg due to formatting bars) have a higher error per mb for the
263 // remaining active MBs. The correction here assumes that coding
264 // 0.5N blocks of complexity 2X is a little easier than coding N
265 // blocks of complexity X.
266 modified_error *=
267 pow(calculate_active_area(cpi, this_frame), ACT_AREA_CORRECTION);
268
269 return fclamp(modified_error, twopass->modified_error_min,
270 twopass->modified_error_max);
271 }
272
273 // This function returns the maximum target rate per frame.
frame_max_bits(const RATE_CONTROL * rc,const AV1EncoderConfig * oxcf)274 static int frame_max_bits(const RATE_CONTROL *rc,
275 const AV1EncoderConfig *oxcf) {
276 int64_t max_bits = ((int64_t)rc->avg_frame_bandwidth *
277 (int64_t)oxcf->two_pass_vbrmax_section) /
278 100;
279 if (max_bits < 0)
280 max_bits = 0;
281 else if (max_bits > rc->max_frame_bandwidth)
282 max_bits = rc->max_frame_bandwidth;
283
284 return (int)max_bits;
285 }
286
av1_init_first_pass(AV1_COMP * cpi)287 void av1_init_first_pass(AV1_COMP *cpi) {
288 zero_stats(&cpi->twopass.total_stats);
289 }
290
av1_end_first_pass(AV1_COMP * cpi)291 void av1_end_first_pass(AV1_COMP *cpi) {
292 output_stats(&cpi->twopass.total_stats, cpi->output_pkt_list);
293 }
294
get_block_variance_fn(BLOCK_SIZE bsize)295 static aom_variance_fn_t get_block_variance_fn(BLOCK_SIZE bsize) {
296 switch (bsize) {
297 case BLOCK_8X8: return aom_mse8x8;
298 case BLOCK_16X8: return aom_mse16x8;
299 case BLOCK_8X16: return aom_mse8x16;
300 default: return aom_mse16x16;
301 }
302 }
303
get_prediction_error(BLOCK_SIZE bsize,const struct buf_2d * src,const struct buf_2d * ref)304 static unsigned int get_prediction_error(BLOCK_SIZE bsize,
305 const struct buf_2d *src,
306 const struct buf_2d *ref) {
307 unsigned int sse;
308 const aom_variance_fn_t fn = get_block_variance_fn(bsize);
309 fn(src->buf, src->stride, ref->buf, ref->stride, &sse);
310 return sse;
311 }
312
highbd_get_block_variance_fn(BLOCK_SIZE bsize,int bd)313 static aom_variance_fn_t highbd_get_block_variance_fn(BLOCK_SIZE bsize,
314 int bd) {
315 switch (bd) {
316 default:
317 switch (bsize) {
318 case BLOCK_8X8: return aom_highbd_8_mse8x8;
319 case BLOCK_16X8: return aom_highbd_8_mse16x8;
320 case BLOCK_8X16: return aom_highbd_8_mse8x16;
321 default: return aom_highbd_8_mse16x16;
322 }
323 break;
324 case 10:
325 switch (bsize) {
326 case BLOCK_8X8: return aom_highbd_10_mse8x8;
327 case BLOCK_16X8: return aom_highbd_10_mse16x8;
328 case BLOCK_8X16: return aom_highbd_10_mse8x16;
329 default: return aom_highbd_10_mse16x16;
330 }
331 break;
332 case 12:
333 switch (bsize) {
334 case BLOCK_8X8: return aom_highbd_12_mse8x8;
335 case BLOCK_16X8: return aom_highbd_12_mse16x8;
336 case BLOCK_8X16: return aom_highbd_12_mse8x16;
337 default: return aom_highbd_12_mse16x16;
338 }
339 break;
340 }
341 }
342
highbd_get_prediction_error(BLOCK_SIZE bsize,const struct buf_2d * src,const struct buf_2d * ref,int bd)343 static unsigned int highbd_get_prediction_error(BLOCK_SIZE bsize,
344 const struct buf_2d *src,
345 const struct buf_2d *ref,
346 int bd) {
347 unsigned int sse;
348 const aom_variance_fn_t fn = highbd_get_block_variance_fn(bsize, bd);
349 fn(src->buf, src->stride, ref->buf, ref->stride, &sse);
350 return sse;
351 }
352
353 // Refine the motion search range according to the frame dimension
354 // for first pass test.
get_search_range(const AV1_COMP * cpi)355 static int get_search_range(const AV1_COMP *cpi) {
356 int sr = 0;
357 const int dim = AOMMIN(cpi->initial_width, cpi->initial_height);
358
359 while ((dim << sr) < MAX_FULL_PEL_VAL) ++sr;
360 return sr;
361 }
362
first_pass_motion_search(AV1_COMP * cpi,MACROBLOCK * x,const MV * ref_mv,MV * best_mv,int * best_motion_err)363 static void first_pass_motion_search(AV1_COMP *cpi, MACROBLOCK *x,
364 const MV *ref_mv, MV *best_mv,
365 int *best_motion_err) {
366 MACROBLOCKD *const xd = &x->e_mbd;
367 MV tmp_mv = kZeroMv;
368 MV ref_mv_full = { ref_mv->row >> 3, ref_mv->col >> 3 };
369 int num00, tmp_err, n;
370 const BLOCK_SIZE bsize = xd->mi[0]->sb_type;
371 aom_variance_fn_ptr_t v_fn_ptr = cpi->fn_ptr[bsize];
372 const int new_mv_mode_penalty = NEW_MV_MODE_PENALTY;
373
374 int step_param = 3;
375 int further_steps = (MAX_MVSEARCH_STEPS - 1) - step_param;
376 const int sr = get_search_range(cpi);
377 step_param += sr;
378 further_steps -= sr;
379
380 // Override the default variance function to use MSE.
381 v_fn_ptr.vf = get_block_variance_fn(bsize);
382 if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
383 v_fn_ptr.vf = highbd_get_block_variance_fn(bsize, xd->bd);
384 }
385
386 // Center the initial step/diamond search on best mv.
387 tmp_err = cpi->diamond_search_sad(x, &cpi->ss_cfg, &ref_mv_full, &tmp_mv,
388 step_param, x->sadperbit16, &num00,
389 &v_fn_ptr, ref_mv);
390 if (tmp_err < INT_MAX)
391 tmp_err = av1_get_mvpred_var(x, &tmp_mv, ref_mv, &v_fn_ptr, 1);
392 if (tmp_err < INT_MAX - new_mv_mode_penalty) tmp_err += new_mv_mode_penalty;
393
394 if (tmp_err < *best_motion_err) {
395 *best_motion_err = tmp_err;
396 *best_mv = tmp_mv;
397 }
398
399 // Carry out further step/diamond searches as necessary.
400 n = num00;
401 num00 = 0;
402
403 while (n < further_steps) {
404 ++n;
405
406 if (num00) {
407 --num00;
408 } else {
409 tmp_err = cpi->diamond_search_sad(x, &cpi->ss_cfg, &ref_mv_full, &tmp_mv,
410 step_param + n, x->sadperbit16, &num00,
411 &v_fn_ptr, ref_mv);
412 if (tmp_err < INT_MAX)
413 tmp_err = av1_get_mvpred_var(x, &tmp_mv, ref_mv, &v_fn_ptr, 1);
414 if (tmp_err < INT_MAX - new_mv_mode_penalty)
415 tmp_err += new_mv_mode_penalty;
416
417 if (tmp_err < *best_motion_err) {
418 *best_motion_err = tmp_err;
419 *best_mv = tmp_mv;
420 }
421 }
422 }
423 }
424
get_bsize(const AV1_COMMON * cm,int mb_row,int mb_col)425 static BLOCK_SIZE get_bsize(const AV1_COMMON *cm, int mb_row, int mb_col) {
426 if (mi_size_wide[BLOCK_16X16] * mb_col + mi_size_wide[BLOCK_8X8] <
427 cm->mi_cols) {
428 return mi_size_wide[BLOCK_16X16] * mb_row + mi_size_wide[BLOCK_8X8] <
429 cm->mi_rows
430 ? BLOCK_16X16
431 : BLOCK_16X8;
432 } else {
433 return mi_size_wide[BLOCK_16X16] * mb_row + mi_size_wide[BLOCK_8X8] <
434 cm->mi_rows
435 ? BLOCK_8X16
436 : BLOCK_8X8;
437 }
438 }
439
find_fp_qindex(aom_bit_depth_t bit_depth)440 static int find_fp_qindex(aom_bit_depth_t bit_depth) {
441 int i;
442
443 for (i = 0; i < QINDEX_RANGE; ++i)
444 if (av1_convert_qindex_to_q(i, bit_depth) >= FIRST_PASS_Q) break;
445
446 if (i == QINDEX_RANGE) i--;
447
448 return i;
449 }
450
set_first_pass_params(AV1_COMP * cpi)451 static void set_first_pass_params(AV1_COMP *cpi) {
452 AV1_COMMON *const cm = &cpi->common;
453 if (!cpi->refresh_alt_ref_frame &&
454 (cm->current_video_frame == 0 || (cpi->frame_flags & FRAMEFLAGS_KEY))) {
455 cm->frame_type = KEY_FRAME;
456 } else {
457 cm->frame_type = INTER_FRAME;
458 }
459 // Do not use periodic key frames.
460 cpi->rc.frames_to_key = INT_MAX;
461 }
462
raw_motion_error_stdev(int * raw_motion_err_list,int raw_motion_err_counts)463 static double raw_motion_error_stdev(int *raw_motion_err_list,
464 int raw_motion_err_counts) {
465 int64_t sum_raw_err = 0;
466 double raw_err_avg = 0;
467 double raw_err_stdev = 0;
468 if (raw_motion_err_counts == 0) return 0;
469
470 int i;
471 for (i = 0; i < raw_motion_err_counts; i++) {
472 sum_raw_err += raw_motion_err_list[i];
473 }
474 raw_err_avg = (double)sum_raw_err / raw_motion_err_counts;
475 for (i = 0; i < raw_motion_err_counts; i++) {
476 raw_err_stdev += (raw_motion_err_list[i] - raw_err_avg) *
477 (raw_motion_err_list[i] - raw_err_avg);
478 }
479 // Calculate the standard deviation for the motion error of all the inter
480 // blocks of the 0,0 motion using the last source
481 // frame as the reference.
482 raw_err_stdev = sqrt(raw_err_stdev / raw_motion_err_counts);
483 return raw_err_stdev;
484 }
485
486 #define UL_INTRA_THRESH 50
487 #define INVALID_ROW -1
av1_first_pass(AV1_COMP * cpi,const struct lookahead_entry * source)488 void av1_first_pass(AV1_COMP *cpi, const struct lookahead_entry *source) {
489 int mb_row, mb_col;
490 MACROBLOCK *const x = &cpi->td.mb;
491 AV1_COMMON *const cm = &cpi->common;
492 const SequenceHeader *const seq_params = &cm->seq_params;
493 const int num_planes = av1_num_planes(cm);
494 MACROBLOCKD *const xd = &x->e_mbd;
495 TileInfo tile;
496 struct macroblock_plane *const p = x->plane;
497 struct macroblockd_plane *const pd = xd->plane;
498 const PICK_MODE_CONTEXT *ctx =
499 &cpi->td.pc_root[MAX_MIB_SIZE_LOG2 - MIN_MIB_SIZE_LOG2]->none;
500 int i;
501
502 int recon_yoffset, recon_uvoffset;
503 int64_t intra_error = 0;
504 int64_t frame_avg_wavelet_energy = 0;
505 int64_t coded_error = 0;
506 int64_t sr_coded_error = 0;
507
508 int sum_mvr = 0, sum_mvc = 0;
509 int sum_mvr_abs = 0, sum_mvc_abs = 0;
510 int64_t sum_mvrs = 0, sum_mvcs = 0;
511 int mvcount = 0;
512 int intercount = 0;
513 int second_ref_count = 0;
514 const int intrapenalty = INTRA_MODE_PENALTY;
515 double neutral_count;
516 int intra_skip_count = 0;
517 int image_data_start_row = INVALID_ROW;
518 int new_mv_count = 0;
519 int sum_in_vectors = 0;
520 MV lastmv = kZeroMv;
521 TWO_PASS *twopass = &cpi->twopass;
522 int recon_y_stride, recon_uv_stride, uv_mb_height;
523
524 YV12_BUFFER_CONFIG *const lst_yv12 = get_ref_frame_buffer(cpi, LAST_FRAME);
525 YV12_BUFFER_CONFIG *gld_yv12 = get_ref_frame_buffer(cpi, GOLDEN_FRAME);
526 YV12_BUFFER_CONFIG *const new_yv12 = get_frame_new_buffer(cm);
527 const YV12_BUFFER_CONFIG *first_ref_buf = lst_yv12;
528 double intra_factor;
529 double brightness_factor;
530 BufferPool *const pool = cm->buffer_pool;
531 const int qindex = find_fp_qindex(seq_params->bit_depth);
532 const int mb_scale = mi_size_wide[BLOCK_16X16];
533
534 int *raw_motion_err_list;
535 int raw_motion_err_counts = 0;
536 CHECK_MEM_ERROR(
537 cm, raw_motion_err_list,
538 aom_calloc(cm->mb_rows * cm->mb_cols, sizeof(*raw_motion_err_list)));
539 // First pass code requires valid last and new frame buffers.
540 assert(new_yv12 != NULL);
541 assert(frame_is_intra_only(cm) || (lst_yv12 != NULL));
542
543 #if CONFIG_FP_MB_STATS
544 if (cpi->use_fp_mb_stats) {
545 av1_zero_array(cpi->twopass.frame_mb_stats_buf, cpi->initial_mbs);
546 }
547 #endif
548
549 aom_clear_system_state();
550
551 xd->mi = cm->mi_grid_visible;
552 xd->mi[0] = cm->mi;
553 x->e_mbd.mi[0]->sb_type = BLOCK_16X16;
554
555 intra_factor = 0.0;
556 brightness_factor = 0.0;
557 neutral_count = 0.0;
558
559 set_first_pass_params(cpi);
560 av1_set_quantizer(cm, qindex);
561
562 av1_setup_block_planes(&x->e_mbd, seq_params->subsampling_x,
563 seq_params->subsampling_y, num_planes);
564
565 av1_setup_src_planes(x, cpi->source, 0, 0, num_planes);
566 av1_setup_dst_planes(xd->plane, seq_params->sb_size, new_yv12, 0, 0, 0,
567 num_planes);
568
569 if (!frame_is_intra_only(cm)) {
570 av1_setup_pre_planes(xd, 0, first_ref_buf, 0, 0, NULL, num_planes);
571 }
572
573 xd->mi = cm->mi_grid_visible;
574 xd->mi[0] = cm->mi;
575
576 // Don't store luma on the fist pass since chroma is not computed
577 xd->cfl.store_y = 0;
578 av1_frame_init_quantizer(cpi);
579
580 for (i = 0; i < num_planes; ++i) {
581 p[i].coeff = ctx->coeff[i];
582 p[i].qcoeff = ctx->qcoeff[i];
583 pd[i].dqcoeff = ctx->dqcoeff[i];
584 p[i].eobs = ctx->eobs[i];
585 p[i].txb_entropy_ctx = ctx->txb_entropy_ctx[i];
586 }
587
588 av1_init_mv_probs(cm);
589 av1_init_lv_map(cm);
590 av1_initialize_rd_consts(cpi);
591
592 // Tiling is ignored in the first pass.
593 av1_tile_init(&tile, cm, 0, 0);
594
595 recon_y_stride = new_yv12->y_stride;
596 recon_uv_stride = new_yv12->uv_stride;
597 uv_mb_height = 16 >> (new_yv12->y_height > new_yv12->uv_height);
598
599 for (mb_row = 0; mb_row < cm->mb_rows; ++mb_row) {
600 MV best_ref_mv = kZeroMv;
601
602 // Reset above block coeffs.
603 xd->up_available = (mb_row != 0);
604 recon_yoffset = (mb_row * recon_y_stride * 16);
605 recon_uvoffset = (mb_row * recon_uv_stride * uv_mb_height);
606
607 // Set up limit values for motion vectors to prevent them extending
608 // outside the UMV borders.
609 x->mv_limits.row_min = -((mb_row * 16) + BORDER_MV_PIXELS_B16);
610 x->mv_limits.row_max =
611 ((cm->mb_rows - 1 - mb_row) * 16) + BORDER_MV_PIXELS_B16;
612
613 for (mb_col = 0; mb_col < cm->mb_cols; ++mb_col) {
614 int this_error;
615 const int use_dc_pred = (mb_col || mb_row) && (!mb_col || !mb_row);
616 const BLOCK_SIZE bsize = get_bsize(cm, mb_row, mb_col);
617 double log_intra;
618 int level_sample;
619
620 #if CONFIG_FP_MB_STATS
621 const int mb_index = mb_row * cm->mb_cols + mb_col;
622 #endif
623
624 aom_clear_system_state();
625
626 const int idx_str = xd->mi_stride * mb_row * mb_scale + mb_col * mb_scale;
627 xd->mi = cm->mi_grid_visible + idx_str;
628 xd->mi[0] = cm->mi + idx_str;
629 xd->plane[0].dst.buf = new_yv12->y_buffer + recon_yoffset;
630 xd->plane[1].dst.buf = new_yv12->u_buffer + recon_uvoffset;
631 xd->plane[2].dst.buf = new_yv12->v_buffer + recon_uvoffset;
632 xd->left_available = (mb_col != 0);
633 xd->mi[0]->sb_type = bsize;
634 xd->mi[0]->ref_frame[0] = INTRA_FRAME;
635 set_mi_row_col(xd, &tile, mb_row * mb_scale, mi_size_high[bsize],
636 mb_col * mb_scale, mi_size_wide[bsize], cm->mi_rows,
637 cm->mi_cols);
638
639 set_plane_n4(xd, mi_size_wide[bsize], mi_size_high[bsize], num_planes);
640
641 // Do intra 16x16 prediction.
642 xd->mi[0]->segment_id = 0;
643 xd->lossless[xd->mi[0]->segment_id] = (qindex == 0);
644 xd->mi[0]->mode = DC_PRED;
645 xd->mi[0]->tx_size =
646 use_dc_pred ? (bsize >= BLOCK_16X16 ? TX_16X16 : TX_8X8) : TX_4X4;
647 av1_encode_intra_block_plane(cpi, x, bsize, 0, 0, mb_row * 2, mb_col * 2);
648 this_error = aom_get_mb_ss(x->plane[0].src_diff);
649
650 // Keep a record of blocks that have almost no intra error residual
651 // (i.e. are in effect completely flat and untextured in the intra
652 // domain). In natural videos this is uncommon, but it is much more
653 // common in animations, graphics and screen content, so may be used
654 // as a signal to detect these types of content.
655 if (this_error < UL_INTRA_THRESH) {
656 ++intra_skip_count;
657 } else if ((mb_col > 0) && (image_data_start_row == INVALID_ROW)) {
658 image_data_start_row = mb_row;
659 }
660
661 if (seq_params->use_highbitdepth) {
662 switch (seq_params->bit_depth) {
663 case AOM_BITS_8: break;
664 case AOM_BITS_10: this_error >>= 4; break;
665 case AOM_BITS_12: this_error >>= 8; break;
666 default:
667 assert(0 &&
668 "seq_params->bit_depth should be AOM_BITS_8, "
669 "AOM_BITS_10 or AOM_BITS_12");
670 return;
671 }
672 }
673
674 aom_clear_system_state();
675 log_intra = log(this_error + 1.0);
676 if (log_intra < 10.0)
677 intra_factor += 1.0 + ((10.0 - log_intra) * 0.05);
678 else
679 intra_factor += 1.0;
680
681 if (seq_params->use_highbitdepth)
682 level_sample = CONVERT_TO_SHORTPTR(x->plane[0].src.buf)[0];
683 else
684 level_sample = x->plane[0].src.buf[0];
685 if ((level_sample < DARK_THRESH) && (log_intra < 9.0))
686 brightness_factor += 1.0 + (0.01 * (DARK_THRESH - level_sample));
687 else
688 brightness_factor += 1.0;
689
690 // Intrapenalty below deals with situations where the intra and inter
691 // error scores are very low (e.g. a plain black frame).
692 // We do not have special cases in first pass for 0,0 and nearest etc so
693 // all inter modes carry an overhead cost estimate for the mv.
694 // When the error score is very low this causes us to pick all or lots of
695 // INTRA modes and throw lots of key frames.
696 // This penalty adds a cost matching that of a 0,0 mv to the intra case.
697 this_error += intrapenalty;
698
699 // Accumulate the intra error.
700 intra_error += (int64_t)this_error;
701
702 int stride = x->plane[0].src.stride;
703 uint8_t *buf = x->plane[0].src.buf;
704 for (int r8 = 0; r8 < 2; ++r8)
705 for (int c8 = 0; c8 < 2; ++c8) {
706 int hbd = xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH;
707 frame_avg_wavelet_energy += av1_haar_ac_sad_8x8_uint8_input(
708 buf + c8 * 8 + r8 * 8 * stride, stride, hbd);
709 }
710
711 #if CONFIG_FP_MB_STATS
712 if (cpi->use_fp_mb_stats) {
713 // initialization
714 cpi->twopass.frame_mb_stats_buf[mb_index] = 0;
715 }
716 #endif
717
718 // Set up limit values for motion vectors to prevent them extending
719 // outside the UMV borders.
720 x->mv_limits.col_min = -((mb_col * 16) + BORDER_MV_PIXELS_B16);
721 x->mv_limits.col_max =
722 ((cm->mb_cols - 1 - mb_col) * 16) + BORDER_MV_PIXELS_B16;
723
724 if (!frame_is_intra_only(cm)) { // Do a motion search
725 int tmp_err, motion_error, raw_motion_error;
726 // Assume 0,0 motion with no mv overhead.
727 MV mv = kZeroMv, tmp_mv = kZeroMv;
728 struct buf_2d unscaled_last_source_buf_2d;
729
730 xd->plane[0].pre[0].buf = first_ref_buf->y_buffer + recon_yoffset;
731 if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
732 motion_error = highbd_get_prediction_error(
733 bsize, &x->plane[0].src, &xd->plane[0].pre[0], xd->bd);
734 } else {
735 motion_error = get_prediction_error(bsize, &x->plane[0].src,
736 &xd->plane[0].pre[0]);
737 }
738
739 // Compute the motion error of the 0,0 motion using the last source
740 // frame as the reference. Skip the further motion search on
741 // reconstructed frame if this error is small.
742 unscaled_last_source_buf_2d.buf =
743 cpi->unscaled_last_source->y_buffer + recon_yoffset;
744 unscaled_last_source_buf_2d.stride =
745 cpi->unscaled_last_source->y_stride;
746 if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
747 raw_motion_error = highbd_get_prediction_error(
748 bsize, &x->plane[0].src, &unscaled_last_source_buf_2d, xd->bd);
749 } else {
750 raw_motion_error = get_prediction_error(bsize, &x->plane[0].src,
751 &unscaled_last_source_buf_2d);
752 }
753
754 // TODO(pengchong): Replace the hard-coded threshold
755 if (raw_motion_error > 25) {
756 // Test last reference frame using the previous best mv as the
757 // starting point (best reference) for the search.
758 first_pass_motion_search(cpi, x, &best_ref_mv, &mv, &motion_error);
759
760 // If the current best reference mv is not centered on 0,0 then do a
761 // 0,0 based search as well.
762 if (!is_zero_mv(&best_ref_mv)) {
763 tmp_err = INT_MAX;
764 first_pass_motion_search(cpi, x, &kZeroMv, &tmp_mv, &tmp_err);
765
766 if (tmp_err < motion_error) {
767 motion_error = tmp_err;
768 mv = tmp_mv;
769 }
770 }
771
772 // Search in an older reference frame.
773 if ((cm->current_video_frame > 1) && gld_yv12 != NULL) {
774 // Assume 0,0 motion with no mv overhead.
775 int gf_motion_error;
776
777 xd->plane[0].pre[0].buf = gld_yv12->y_buffer + recon_yoffset;
778 if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
779 gf_motion_error = highbd_get_prediction_error(
780 bsize, &x->plane[0].src, &xd->plane[0].pre[0], xd->bd);
781 } else {
782 gf_motion_error = get_prediction_error(bsize, &x->plane[0].src,
783 &xd->plane[0].pre[0]);
784 }
785
786 first_pass_motion_search(cpi, x, &kZeroMv, &tmp_mv,
787 &gf_motion_error);
788
789 if (gf_motion_error < motion_error && gf_motion_error < this_error)
790 ++second_ref_count;
791
792 // Reset to last frame as reference buffer.
793 xd->plane[0].pre[0].buf = first_ref_buf->y_buffer + recon_yoffset;
794 xd->plane[1].pre[0].buf = first_ref_buf->u_buffer + recon_uvoffset;
795 xd->plane[2].pre[0].buf = first_ref_buf->v_buffer + recon_uvoffset;
796
797 // In accumulating a score for the older reference frame take the
798 // best of the motion predicted score and the intra coded error
799 // (just as will be done for) accumulation of "coded_error" for
800 // the last frame.
801 if (gf_motion_error < this_error)
802 sr_coded_error += gf_motion_error;
803 else
804 sr_coded_error += this_error;
805 } else {
806 sr_coded_error += motion_error;
807 }
808 } else {
809 sr_coded_error += motion_error;
810 }
811
812 // Start by assuming that intra mode is best.
813 best_ref_mv.row = 0;
814 best_ref_mv.col = 0;
815
816 #if CONFIG_FP_MB_STATS
817 if (cpi->use_fp_mb_stats) {
818 // intra predication statistics
819 cpi->twopass.frame_mb_stats_buf[mb_index] = 0;
820 cpi->twopass.frame_mb_stats_buf[mb_index] |= FPMB_DCINTRA_MASK;
821 cpi->twopass.frame_mb_stats_buf[mb_index] |= FPMB_MOTION_ZERO_MASK;
822 if (this_error > FPMB_ERROR_LARGE_TH) {
823 cpi->twopass.frame_mb_stats_buf[mb_index] |= FPMB_ERROR_LARGE_MASK;
824 } else if (this_error < FPMB_ERROR_SMALL_TH) {
825 cpi->twopass.frame_mb_stats_buf[mb_index] |= FPMB_ERROR_SMALL_MASK;
826 }
827 }
828 #endif
829
830 if (motion_error <= this_error) {
831 aom_clear_system_state();
832
833 // Keep a count of cases where the inter and intra were very close
834 // and very low. This helps with scene cut detection for example in
835 // cropped clips with black bars at the sides or top and bottom.
836 if (((this_error - intrapenalty) * 9 <= motion_error * 10) &&
837 (this_error < (2 * intrapenalty))) {
838 neutral_count += 1.0;
839 // Also track cases where the intra is not much worse than the inter
840 // and use this in limiting the GF/arf group length.
841 } else if ((this_error > NCOUNT_INTRA_THRESH) &&
842 (this_error < (NCOUNT_INTRA_FACTOR * motion_error))) {
843 neutral_count +=
844 (double)motion_error / DOUBLE_DIVIDE_CHECK((double)this_error);
845 }
846
847 mv.row *= 8;
848 mv.col *= 8;
849 this_error = motion_error;
850 xd->mi[0]->mode = NEWMV;
851 xd->mi[0]->mv[0].as_mv = mv;
852 xd->mi[0]->tx_size = TX_4X4;
853 xd->mi[0]->ref_frame[0] = LAST_FRAME;
854 xd->mi[0]->ref_frame[1] = NONE_FRAME;
855 av1_build_inter_predictors_sby(cm, xd, mb_row * mb_scale,
856 mb_col * mb_scale, NULL, bsize);
857 av1_encode_sby_pass1(cm, x, bsize);
858 sum_mvr += mv.row;
859 sum_mvr_abs += abs(mv.row);
860 sum_mvc += mv.col;
861 sum_mvc_abs += abs(mv.col);
862 sum_mvrs += mv.row * mv.row;
863 sum_mvcs += mv.col * mv.col;
864 ++intercount;
865
866 best_ref_mv = mv;
867
868 #if CONFIG_FP_MB_STATS
869 if (cpi->use_fp_mb_stats) {
870 // inter predication statistics
871 cpi->twopass.frame_mb_stats_buf[mb_index] = 0;
872 cpi->twopass.frame_mb_stats_buf[mb_index] &= ~FPMB_DCINTRA_MASK;
873 cpi->twopass.frame_mb_stats_buf[mb_index] |= FPMB_MOTION_ZERO_MASK;
874 if (this_error > FPMB_ERROR_LARGE_TH) {
875 cpi->twopass.frame_mb_stats_buf[mb_index] |=
876 FPMB_ERROR_LARGE_MASK;
877 } else if (this_error < FPMB_ERROR_SMALL_TH) {
878 cpi->twopass.frame_mb_stats_buf[mb_index] |=
879 FPMB_ERROR_SMALL_MASK;
880 }
881 }
882 #endif
883
884 if (!is_zero_mv(&mv)) {
885 ++mvcount;
886
887 #if CONFIG_FP_MB_STATS
888 if (cpi->use_fp_mb_stats) {
889 cpi->twopass.frame_mb_stats_buf[mb_index] &=
890 ~FPMB_MOTION_ZERO_MASK;
891 // check estimated motion direction
892 if (mv.col > 0 && mv.col >= abs(mv.row)) {
893 // right direction
894 cpi->twopass.frame_mb_stats_buf[mb_index] |=
895 FPMB_MOTION_RIGHT_MASK;
896 } else if (mv.row < 0 && abs(mv.row) >= abs(mv.col)) {
897 // up direction
898 cpi->twopass.frame_mb_stats_buf[mb_index] |=
899 FPMB_MOTION_UP_MASK;
900 } else if (mv.col < 0 && abs(mv.col) >= abs(mv.row)) {
901 // left direction
902 cpi->twopass.frame_mb_stats_buf[mb_index] |=
903 FPMB_MOTION_LEFT_MASK;
904 } else {
905 // down direction
906 cpi->twopass.frame_mb_stats_buf[mb_index] |=
907 FPMB_MOTION_DOWN_MASK;
908 }
909 }
910 #endif
911
912 // Non-zero vector, was it different from the last non zero vector?
913 if (!is_equal_mv(&mv, &lastmv)) ++new_mv_count;
914 lastmv = mv;
915
916 // Does the row vector point inwards or outwards?
917 if (mb_row < cm->mb_rows / 2) {
918 if (mv.row > 0)
919 --sum_in_vectors;
920 else if (mv.row < 0)
921 ++sum_in_vectors;
922 } else if (mb_row > cm->mb_rows / 2) {
923 if (mv.row > 0)
924 ++sum_in_vectors;
925 else if (mv.row < 0)
926 --sum_in_vectors;
927 }
928
929 // Does the col vector point inwards or outwards?
930 if (mb_col < cm->mb_cols / 2) {
931 if (mv.col > 0)
932 --sum_in_vectors;
933 else if (mv.col < 0)
934 ++sum_in_vectors;
935 } else if (mb_col > cm->mb_cols / 2) {
936 if (mv.col > 0)
937 ++sum_in_vectors;
938 else if (mv.col < 0)
939 --sum_in_vectors;
940 }
941 }
942 }
943 raw_motion_err_list[raw_motion_err_counts++] = raw_motion_error;
944 } else {
945 sr_coded_error += (int64_t)this_error;
946 }
947 coded_error += (int64_t)this_error;
948
949 // Adjust to the next column of MBs.
950 x->plane[0].src.buf += 16;
951 x->plane[1].src.buf += uv_mb_height;
952 x->plane[2].src.buf += uv_mb_height;
953
954 recon_yoffset += 16;
955 recon_uvoffset += uv_mb_height;
956 }
957 // Adjust to the next row of MBs.
958 x->plane[0].src.buf += 16 * x->plane[0].src.stride - 16 * cm->mb_cols;
959 x->plane[1].src.buf +=
960 uv_mb_height * x->plane[1].src.stride - uv_mb_height * cm->mb_cols;
961 x->plane[2].src.buf +=
962 uv_mb_height * x->plane[1].src.stride - uv_mb_height * cm->mb_cols;
963
964 aom_clear_system_state();
965 }
966 const double raw_err_stdev =
967 raw_motion_error_stdev(raw_motion_err_list, raw_motion_err_counts);
968 aom_free(raw_motion_err_list);
969
970 // Clamp the image start to rows/2. This number of rows is discarded top
971 // and bottom as dead data so rows / 2 means the frame is blank.
972 if ((image_data_start_row > cm->mb_rows / 2) ||
973 (image_data_start_row == INVALID_ROW)) {
974 image_data_start_row = cm->mb_rows / 2;
975 }
976 // Exclude any image dead zone
977 if (image_data_start_row > 0) {
978 intra_skip_count =
979 AOMMAX(0, intra_skip_count - (image_data_start_row * cm->mb_cols * 2));
980 }
981
982 {
983 FIRSTPASS_STATS fps;
984 // The minimum error here insures some bit allocation to frames even
985 // in static regions. The allocation per MB declines for larger formats
986 // where the typical "real" energy per MB also falls.
987 // Initial estimate here uses sqrt(mbs) to define the min_err, where the
988 // number of mbs is proportional to the image area.
989 const int num_mbs = (cpi->oxcf.resize_mode != RESIZE_NONE)
990 ? cpi->initial_mbs
991 : cpi->common.MBs;
992 const double min_err = 200 * sqrt(num_mbs);
993
994 intra_factor = intra_factor / (double)num_mbs;
995 brightness_factor = brightness_factor / (double)num_mbs;
996 fps.weight = intra_factor * brightness_factor;
997
998 fps.frame = cm->current_video_frame;
999 fps.coded_error = (double)(coded_error >> 8) + min_err;
1000 fps.sr_coded_error = (double)(sr_coded_error >> 8) + min_err;
1001 fps.intra_error = (double)(intra_error >> 8) + min_err;
1002 fps.frame_avg_wavelet_energy = (double)frame_avg_wavelet_energy;
1003 fps.count = 1.0;
1004 fps.pcnt_inter = (double)intercount / num_mbs;
1005 fps.pcnt_second_ref = (double)second_ref_count / num_mbs;
1006 fps.pcnt_neutral = (double)neutral_count / num_mbs;
1007 fps.intra_skip_pct = (double)intra_skip_count / num_mbs;
1008 fps.inactive_zone_rows = (double)image_data_start_row;
1009 fps.inactive_zone_cols = (double)0; // TODO(paulwilkins): fix
1010 fps.raw_error_stdev = raw_err_stdev;
1011
1012 if (mvcount > 0) {
1013 fps.MVr = (double)sum_mvr / mvcount;
1014 fps.mvr_abs = (double)sum_mvr_abs / mvcount;
1015 fps.MVc = (double)sum_mvc / mvcount;
1016 fps.mvc_abs = (double)sum_mvc_abs / mvcount;
1017 fps.MVrv =
1018 ((double)sum_mvrs - ((double)sum_mvr * sum_mvr / mvcount)) / mvcount;
1019 fps.MVcv =
1020 ((double)sum_mvcs - ((double)sum_mvc * sum_mvc / mvcount)) / mvcount;
1021 fps.mv_in_out_count = (double)sum_in_vectors / (mvcount * 2);
1022 fps.new_mv_count = new_mv_count;
1023 fps.pcnt_motion = (double)mvcount / num_mbs;
1024 } else {
1025 fps.MVr = 0.0;
1026 fps.mvr_abs = 0.0;
1027 fps.MVc = 0.0;
1028 fps.mvc_abs = 0.0;
1029 fps.MVrv = 0.0;
1030 fps.MVcv = 0.0;
1031 fps.mv_in_out_count = 0.0;
1032 fps.new_mv_count = 0.0;
1033 fps.pcnt_motion = 0.0;
1034 }
1035
1036 // TODO(paulwilkins): Handle the case when duration is set to 0, or
1037 // something less than the full time between subsequent values of
1038 // cpi->source_time_stamp.
1039 fps.duration = (double)(source->ts_end - source->ts_start);
1040
1041 // Don't want to do output stats with a stack variable!
1042 twopass->this_frame_stats = fps;
1043 output_stats(&twopass->this_frame_stats, cpi->output_pkt_list);
1044 accumulate_stats(&twopass->total_stats, &fps);
1045
1046 #if CONFIG_FP_MB_STATS
1047 if (cpi->use_fp_mb_stats) {
1048 output_fpmb_stats(twopass->frame_mb_stats_buf, cpi->initial_mbs,
1049 cpi->output_pkt_list);
1050 }
1051 #endif
1052 }
1053
1054 // Copy the previous Last Frame back into gf and and arf buffers if
1055 // the prediction is good enough... but also don't allow it to lag too far.
1056 if ((twopass->sr_update_lag > 3) ||
1057 ((cm->current_video_frame > 0) &&
1058 (twopass->this_frame_stats.pcnt_inter > 0.20) &&
1059 ((twopass->this_frame_stats.intra_error /
1060 DOUBLE_DIVIDE_CHECK(twopass->this_frame_stats.coded_error)) > 2.0))) {
1061 if (gld_yv12 != NULL) {
1062 ref_cnt_fb(pool->frame_bufs,
1063 &cm->ref_frame_map[cpi->ref_fb_idx[GOLDEN_FRAME - 1]],
1064 cm->ref_frame_map[cpi->ref_fb_idx[LAST_FRAME - 1]]);
1065 }
1066 twopass->sr_update_lag = 1;
1067 } else {
1068 ++twopass->sr_update_lag;
1069 }
1070
1071 aom_extend_frame_borders(new_yv12, num_planes);
1072
1073 // The frame we just compressed now becomes the last frame.
1074 ref_cnt_fb(pool->frame_bufs,
1075 &cm->ref_frame_map[cpi->ref_fb_idx[LAST_FRAME - 1]],
1076 cm->new_fb_idx);
1077
1078 // Special case for the first frame. Copy into the GF buffer as a second
1079 // reference.
1080 if (cm->current_video_frame == 0 &&
1081 cpi->ref_fb_idx[GOLDEN_FRAME - 1] != INVALID_IDX) {
1082 ref_cnt_fb(pool->frame_bufs,
1083 &cm->ref_frame_map[cpi->ref_fb_idx[GOLDEN_FRAME - 1]],
1084 cm->ref_frame_map[cpi->ref_fb_idx[LAST_FRAME - 1]]);
1085 }
1086
1087 // Use this to see what the first pass reconstruction looks like.
1088 if (0) {
1089 char filename[512];
1090 FILE *recon_file;
1091 snprintf(filename, sizeof(filename), "enc%04d.yuv",
1092 (int)cm->current_video_frame);
1093
1094 if (cm->current_video_frame == 0)
1095 recon_file = fopen(filename, "wb");
1096 else
1097 recon_file = fopen(filename, "ab");
1098
1099 (void)fwrite(lst_yv12->buffer_alloc, lst_yv12->frame_size, 1, recon_file);
1100 fclose(recon_file);
1101 }
1102
1103 ++cm->current_video_frame;
1104 }
1105
calc_correction_factor(double err_per_mb,double err_divisor,double pt_low,double pt_high,int q,aom_bit_depth_t bit_depth)1106 static double calc_correction_factor(double err_per_mb, double err_divisor,
1107 double pt_low, double pt_high, int q,
1108 aom_bit_depth_t bit_depth) {
1109 const double error_term = err_per_mb / err_divisor;
1110
1111 // Adjustment based on actual quantizer to power term.
1112 const double power_term =
1113 AOMMIN(av1_convert_qindex_to_q(q, bit_depth) * 0.01 + pt_low, pt_high);
1114
1115 // Calculate correction factor.
1116 if (power_term < 1.0) assert(error_term >= 0.0);
1117
1118 return fclamp(pow(error_term, power_term), 0.05, 5.0);
1119 }
1120
1121 #define ERR_DIVISOR 100.0
get_twopass_worst_quality(const AV1_COMP * cpi,const double section_err,double inactive_zone,int section_target_bandwidth,double group_weight_factor)1122 static int get_twopass_worst_quality(const AV1_COMP *cpi,
1123 const double section_err,
1124 double inactive_zone,
1125 int section_target_bandwidth,
1126 double group_weight_factor) {
1127 const RATE_CONTROL *const rc = &cpi->rc;
1128 const AV1EncoderConfig *const oxcf = &cpi->oxcf;
1129
1130 inactive_zone = fclamp(inactive_zone, 0.0, 1.0);
1131
1132 if (section_target_bandwidth <= 0) {
1133 return rc->worst_quality; // Highest value allowed
1134 } else {
1135 const int num_mbs = (cpi->oxcf.resize_mode != RESIZE_NONE)
1136 ? cpi->initial_mbs
1137 : cpi->common.MBs;
1138 const int active_mbs = AOMMAX(1, num_mbs - (int)(num_mbs * inactive_zone));
1139 const double av_err_per_mb = section_err / active_mbs;
1140 const double speed_term = 1.0;
1141 double ediv_size_correction;
1142 const int target_norm_bits_per_mb =
1143 (int)((uint64_t)section_target_bandwidth << BPER_MB_NORMBITS) /
1144 active_mbs;
1145 int q;
1146
1147 // Larger image formats are expected to be a little harder to code
1148 // relatively given the same prediction error score. This in part at
1149 // least relates to the increased size and hence coding overheads of
1150 // motion vectors. Some account of this is made through adjustment of
1151 // the error divisor.
1152 ediv_size_correction =
1153 AOMMAX(0.2, AOMMIN(5.0, get_linear_size_factor(cpi)));
1154 if (ediv_size_correction < 1.0)
1155 ediv_size_correction = -(1.0 / ediv_size_correction);
1156 ediv_size_correction *= 4.0;
1157
1158 // Try and pick a max Q that will be high enough to encode the
1159 // content at the given rate.
1160 for (q = rc->best_quality; q < rc->worst_quality; ++q) {
1161 const double factor = calc_correction_factor(
1162 av_err_per_mb, ERR_DIVISOR - ediv_size_correction, FACTOR_PT_LOW,
1163 FACTOR_PT_HIGH, q, cpi->common.seq_params.bit_depth);
1164 const int bits_per_mb = av1_rc_bits_per_mb(
1165 INTER_FRAME, q, factor * speed_term * group_weight_factor,
1166 cpi->common.seq_params.bit_depth);
1167 if (bits_per_mb <= target_norm_bits_per_mb) break;
1168 }
1169
1170 // Restriction on active max q for constrained quality mode.
1171 if (cpi->oxcf.rc_mode == AOM_CQ) q = AOMMAX(q, oxcf->cq_level);
1172 return q;
1173 }
1174 }
1175
setup_rf_level_maxq(AV1_COMP * cpi)1176 static void setup_rf_level_maxq(AV1_COMP *cpi) {
1177 int i;
1178 RATE_CONTROL *const rc = &cpi->rc;
1179 for (i = INTER_NORMAL; i < RATE_FACTOR_LEVELS; ++i) {
1180 int qdelta = av1_frame_type_qdelta(cpi, i, rc->worst_quality);
1181 rc->rf_level_maxq[i] = AOMMAX(rc->worst_quality + qdelta, rc->best_quality);
1182 }
1183 }
1184
av1_init_second_pass(AV1_COMP * cpi)1185 void av1_init_second_pass(AV1_COMP *cpi) {
1186 const AV1EncoderConfig *const oxcf = &cpi->oxcf;
1187 TWO_PASS *const twopass = &cpi->twopass;
1188 double frame_rate;
1189 FIRSTPASS_STATS *stats;
1190
1191 zero_stats(&twopass->total_stats);
1192 zero_stats(&twopass->total_left_stats);
1193
1194 if (!twopass->stats_in_end) return;
1195
1196 stats = &twopass->total_stats;
1197
1198 *stats = *twopass->stats_in_end;
1199 twopass->total_left_stats = *stats;
1200
1201 frame_rate = 10000000.0 * stats->count / stats->duration;
1202 // Each frame can have a different duration, as the frame rate in the source
1203 // isn't guaranteed to be constant. The frame rate prior to the first frame
1204 // encoded in the second pass is a guess. However, the sum duration is not.
1205 // It is calculated based on the actual durations of all frames from the
1206 // first pass.
1207 av1_new_framerate(cpi, frame_rate);
1208 twopass->bits_left =
1209 (int64_t)(stats->duration * oxcf->target_bandwidth / 10000000.0);
1210
1211 // This variable monitors how far behind the second ref update is lagging.
1212 twopass->sr_update_lag = 1;
1213
1214 // Scan the first pass file and calculate a modified total error based upon
1215 // the bias/power function used to allocate bits.
1216 {
1217 const double avg_error =
1218 stats->coded_error / DOUBLE_DIVIDE_CHECK(stats->count);
1219 const FIRSTPASS_STATS *s = twopass->stats_in;
1220 double modified_error_total = 0.0;
1221 twopass->modified_error_min =
1222 (avg_error * oxcf->two_pass_vbrmin_section) / 100;
1223 twopass->modified_error_max =
1224 (avg_error * oxcf->two_pass_vbrmax_section) / 100;
1225 while (s < twopass->stats_in_end) {
1226 modified_error_total += calculate_modified_err(cpi, twopass, oxcf, s);
1227 ++s;
1228 }
1229 twopass->modified_error_left = modified_error_total;
1230 }
1231
1232 // Reset the vbr bits off target counters
1233 cpi->rc.vbr_bits_off_target = 0;
1234 cpi->rc.vbr_bits_off_target_fast = 0;
1235
1236 cpi->rc.rate_error_estimate = 0;
1237
1238 // Static sequence monitor variables.
1239 twopass->kf_zeromotion_pct = 100;
1240 twopass->last_kfgroup_zeromotion_pct = 100;
1241
1242 if (oxcf->resize_mode != RESIZE_NONE) {
1243 setup_rf_level_maxq(cpi);
1244 }
1245 }
1246
1247 #define SR_DIFF_PART 0.0015
1248 #define MOTION_AMP_PART 0.003
1249 #define INTRA_PART 0.005
1250 #define DEFAULT_DECAY_LIMIT 0.75
1251 #define LOW_SR_DIFF_TRHESH 0.1
1252 #define SR_DIFF_MAX 128.0
1253
get_sr_decay_rate(const AV1_COMP * cpi,const FIRSTPASS_STATS * frame)1254 static double get_sr_decay_rate(const AV1_COMP *cpi,
1255 const FIRSTPASS_STATS *frame) {
1256 const int num_mbs = (cpi->oxcf.resize_mode != RESIZE_NONE) ? cpi->initial_mbs
1257 : cpi->common.MBs;
1258 double sr_diff = (frame->sr_coded_error - frame->coded_error) / num_mbs;
1259 double sr_decay = 1.0;
1260 double modified_pct_inter;
1261 double modified_pcnt_intra;
1262 const double motion_amplitude_factor =
1263 frame->pcnt_motion * ((frame->mvc_abs + frame->mvr_abs) / 2);
1264
1265 modified_pct_inter = frame->pcnt_inter;
1266 if ((frame->intra_error / DOUBLE_DIVIDE_CHECK(frame->coded_error)) <
1267 (double)NCOUNT_FRAME_II_THRESH) {
1268 modified_pct_inter = frame->pcnt_inter - frame->pcnt_neutral;
1269 }
1270 modified_pcnt_intra = 100 * (1.0 - modified_pct_inter);
1271
1272 if ((sr_diff > LOW_SR_DIFF_TRHESH)) {
1273 sr_diff = AOMMIN(sr_diff, SR_DIFF_MAX);
1274 sr_decay = 1.0 - (SR_DIFF_PART * sr_diff) -
1275 (MOTION_AMP_PART * motion_amplitude_factor) -
1276 (INTRA_PART * modified_pcnt_intra);
1277 }
1278 return AOMMAX(sr_decay, AOMMIN(DEFAULT_DECAY_LIMIT, modified_pct_inter));
1279 }
1280
1281 // This function gives an estimate of how badly we believe the prediction
1282 // quality is decaying from frame to frame.
get_zero_motion_factor(const AV1_COMP * cpi,const FIRSTPASS_STATS * frame)1283 static double get_zero_motion_factor(const AV1_COMP *cpi,
1284 const FIRSTPASS_STATS *frame) {
1285 const double zero_motion_pct = frame->pcnt_inter - frame->pcnt_motion;
1286 double sr_decay = get_sr_decay_rate(cpi, frame);
1287 return AOMMIN(sr_decay, zero_motion_pct);
1288 }
1289
1290 #define ZM_POWER_FACTOR 0.75
1291
get_prediction_decay_rate(const AV1_COMP * cpi,const FIRSTPASS_STATS * next_frame)1292 static double get_prediction_decay_rate(const AV1_COMP *cpi,
1293 const FIRSTPASS_STATS *next_frame) {
1294 const double sr_decay_rate = get_sr_decay_rate(cpi, next_frame);
1295 const double zero_motion_factor =
1296 (0.95 * pow((next_frame->pcnt_inter - next_frame->pcnt_motion),
1297 ZM_POWER_FACTOR));
1298
1299 return AOMMAX(zero_motion_factor,
1300 (sr_decay_rate + ((1.0 - sr_decay_rate) * zero_motion_factor)));
1301 }
1302
1303 // Function to test for a condition where a complex transition is followed
1304 // by a static section. For example in slide shows where there is a fade
1305 // between slides. This is to help with more optimal kf and gf positioning.
detect_transition_to_still(AV1_COMP * cpi,int frame_interval,int still_interval,double loop_decay_rate,double last_decay_rate)1306 static int detect_transition_to_still(AV1_COMP *cpi, int frame_interval,
1307 int still_interval,
1308 double loop_decay_rate,
1309 double last_decay_rate) {
1310 TWO_PASS *const twopass = &cpi->twopass;
1311 RATE_CONTROL *const rc = &cpi->rc;
1312
1313 // Break clause to detect very still sections after motion
1314 // For example a static image after a fade or other transition
1315 // instead of a clean scene cut.
1316 if (frame_interval > rc->min_gf_interval && loop_decay_rate >= 0.999 &&
1317 last_decay_rate < 0.9) {
1318 int j;
1319
1320 // Look ahead a few frames to see if static condition persists...
1321 for (j = 0; j < still_interval; ++j) {
1322 const FIRSTPASS_STATS *stats = &twopass->stats_in[j];
1323 if (stats >= twopass->stats_in_end) break;
1324
1325 if (stats->pcnt_inter - stats->pcnt_motion < 0.999) break;
1326 }
1327
1328 // Only if it does do we signal a transition to still.
1329 return j == still_interval;
1330 }
1331
1332 return 0;
1333 }
1334
1335 // This function detects a flash through the high relative pcnt_second_ref
1336 // score in the frame following a flash frame. The offset passed in should
1337 // reflect this.
detect_flash(const TWO_PASS * twopass,int offset)1338 static int detect_flash(const TWO_PASS *twopass, int offset) {
1339 const FIRSTPASS_STATS *const next_frame = read_frame_stats(twopass, offset);
1340
1341 // What we are looking for here is a situation where there is a
1342 // brief break in prediction (such as a flash) but subsequent frames
1343 // are reasonably well predicted by an earlier (pre flash) frame.
1344 // The recovery after a flash is indicated by a high pcnt_second_ref
1345 // compared to pcnt_inter.
1346 return next_frame != NULL &&
1347 next_frame->pcnt_second_ref > next_frame->pcnt_inter &&
1348 next_frame->pcnt_second_ref >= 0.5;
1349 }
1350
1351 // Update the motion related elements to the GF arf boost calculation.
accumulate_frame_motion_stats(const FIRSTPASS_STATS * stats,double * mv_in_out,double * mv_in_out_accumulator,double * abs_mv_in_out_accumulator,double * mv_ratio_accumulator)1352 static void accumulate_frame_motion_stats(const FIRSTPASS_STATS *stats,
1353 double *mv_in_out,
1354 double *mv_in_out_accumulator,
1355 double *abs_mv_in_out_accumulator,
1356 double *mv_ratio_accumulator) {
1357 const double pct = stats->pcnt_motion;
1358
1359 // Accumulate Motion In/Out of frame stats.
1360 *mv_in_out = stats->mv_in_out_count * pct;
1361 *mv_in_out_accumulator += *mv_in_out;
1362 *abs_mv_in_out_accumulator += fabs(*mv_in_out);
1363
1364 // Accumulate a measure of how uniform (or conversely how random) the motion
1365 // field is (a ratio of abs(mv) / mv).
1366 if (pct > 0.05) {
1367 const double mvr_ratio =
1368 fabs(stats->mvr_abs) / DOUBLE_DIVIDE_CHECK(fabs(stats->MVr));
1369 const double mvc_ratio =
1370 fabs(stats->mvc_abs) / DOUBLE_DIVIDE_CHECK(fabs(stats->MVc));
1371
1372 *mv_ratio_accumulator +=
1373 pct * (mvr_ratio < stats->mvr_abs ? mvr_ratio : stats->mvr_abs);
1374 *mv_ratio_accumulator +=
1375 pct * (mvc_ratio < stats->mvc_abs ? mvc_ratio : stats->mvc_abs);
1376 }
1377 }
1378
1379 #define BASELINE_ERR_PER_MB 1000.0
calc_frame_boost(AV1_COMP * cpi,const FIRSTPASS_STATS * this_frame,double this_frame_mv_in_out,double max_boost)1380 static double calc_frame_boost(AV1_COMP *cpi, const FIRSTPASS_STATS *this_frame,
1381 double this_frame_mv_in_out, double max_boost) {
1382 double frame_boost;
1383 const double lq = av1_convert_qindex_to_q(
1384 cpi->rc.avg_frame_qindex[INTER_FRAME], cpi->common.seq_params.bit_depth);
1385 const double boost_q_correction = AOMMIN((0.5 + (lq * 0.015)), 1.5);
1386 int num_mbs = (cpi->oxcf.resize_mode != RESIZE_NONE) ? cpi->initial_mbs
1387 : cpi->common.MBs;
1388
1389 // Correct for any inactive region in the image
1390 num_mbs = (int)AOMMAX(1, num_mbs * calculate_active_area(cpi, this_frame));
1391
1392 // Underlying boost factor is based on inter error ratio.
1393 frame_boost = (BASELINE_ERR_PER_MB * num_mbs) /
1394 DOUBLE_DIVIDE_CHECK(this_frame->coded_error);
1395 frame_boost = frame_boost * BOOST_FACTOR * boost_q_correction;
1396
1397 // Increase boost for frames where new data coming into frame (e.g. zoom out).
1398 // Slightly reduce boost if there is a net balance of motion out of the frame
1399 // (zoom in). The range for this_frame_mv_in_out is -1.0 to +1.0.
1400 if (this_frame_mv_in_out > 0.0)
1401 frame_boost += frame_boost * (this_frame_mv_in_out * 2.0);
1402 // In the extreme case the boost is halved.
1403 else
1404 frame_boost += frame_boost * (this_frame_mv_in_out / 2.0);
1405
1406 return AOMMIN(frame_boost, max_boost * boost_q_correction);
1407 }
1408
calc_arf_boost(AV1_COMP * cpi,int offset,int f_frames,int b_frames,int * f_boost,int * b_boost)1409 static int calc_arf_boost(AV1_COMP *cpi, int offset, int f_frames, int b_frames,
1410 int *f_boost, int *b_boost) {
1411 TWO_PASS *const twopass = &cpi->twopass;
1412 int i;
1413 double boost_score = 0.0;
1414 double mv_ratio_accumulator = 0.0;
1415 double decay_accumulator = 1.0;
1416 double this_frame_mv_in_out = 0.0;
1417 double mv_in_out_accumulator = 0.0;
1418 double abs_mv_in_out_accumulator = 0.0;
1419 int arf_boost;
1420 int flash_detected = 0;
1421
1422 // Search forward from the proposed arf/next gf position.
1423 for (i = 0; i < f_frames; ++i) {
1424 const FIRSTPASS_STATS *this_frame = read_frame_stats(twopass, i + offset);
1425 if (this_frame == NULL) break;
1426
1427 // Update the motion related elements to the boost calculation.
1428 accumulate_frame_motion_stats(
1429 this_frame, &this_frame_mv_in_out, &mv_in_out_accumulator,
1430 &abs_mv_in_out_accumulator, &mv_ratio_accumulator);
1431
1432 // We want to discount the flash frame itself and the recovery
1433 // frame that follows as both will have poor scores.
1434 flash_detected = detect_flash(twopass, i + offset) ||
1435 detect_flash(twopass, i + offset + 1);
1436
1437 // Accumulate the effect of prediction quality decay.
1438 if (!flash_detected) {
1439 decay_accumulator *= get_prediction_decay_rate(cpi, this_frame);
1440 decay_accumulator = decay_accumulator < MIN_DECAY_FACTOR
1441 ? MIN_DECAY_FACTOR
1442 : decay_accumulator;
1443 }
1444
1445 boost_score +=
1446 decay_accumulator *
1447 calc_frame_boost(cpi, this_frame, this_frame_mv_in_out, GF_MAX_BOOST);
1448 }
1449
1450 *f_boost = (int)boost_score;
1451
1452 // Reset for backward looking loop.
1453 boost_score = 0.0;
1454 mv_ratio_accumulator = 0.0;
1455 decay_accumulator = 1.0;
1456 this_frame_mv_in_out = 0.0;
1457 mv_in_out_accumulator = 0.0;
1458 abs_mv_in_out_accumulator = 0.0;
1459
1460 // Search backward towards last gf position.
1461 for (i = -1; i >= -b_frames; --i) {
1462 const FIRSTPASS_STATS *this_frame = read_frame_stats(twopass, i + offset);
1463 if (this_frame == NULL) break;
1464
1465 // Update the motion related elements to the boost calculation.
1466 accumulate_frame_motion_stats(
1467 this_frame, &this_frame_mv_in_out, &mv_in_out_accumulator,
1468 &abs_mv_in_out_accumulator, &mv_ratio_accumulator);
1469
1470 // We want to discount the the flash frame itself and the recovery
1471 // frame that follows as both will have poor scores.
1472 flash_detected = detect_flash(twopass, i + offset) ||
1473 detect_flash(twopass, i + offset + 1);
1474
1475 // Cumulative effect of prediction quality decay.
1476 if (!flash_detected) {
1477 decay_accumulator *= get_prediction_decay_rate(cpi, this_frame);
1478 decay_accumulator = decay_accumulator < MIN_DECAY_FACTOR
1479 ? MIN_DECAY_FACTOR
1480 : decay_accumulator;
1481 }
1482
1483 boost_score +=
1484 decay_accumulator *
1485 calc_frame_boost(cpi, this_frame, this_frame_mv_in_out, GF_MAX_BOOST);
1486 }
1487 *b_boost = (int)boost_score;
1488
1489 arf_boost = (*f_boost + *b_boost);
1490 if (arf_boost < ((b_frames + f_frames) * 20))
1491 arf_boost = ((b_frames + f_frames) * 20);
1492 arf_boost = AOMMAX(arf_boost, MIN_ARF_GF_BOOST);
1493
1494 return arf_boost;
1495 }
1496
1497 // Calculate a section intra ratio used in setting max loop filter.
calculate_section_intra_ratio(const FIRSTPASS_STATS * begin,const FIRSTPASS_STATS * end,int section_length)1498 static int calculate_section_intra_ratio(const FIRSTPASS_STATS *begin,
1499 const FIRSTPASS_STATS *end,
1500 int section_length) {
1501 const FIRSTPASS_STATS *s = begin;
1502 double intra_error = 0.0;
1503 double coded_error = 0.0;
1504 int i = 0;
1505
1506 while (s < end && i < section_length) {
1507 intra_error += s->intra_error;
1508 coded_error += s->coded_error;
1509 ++s;
1510 ++i;
1511 }
1512
1513 return (int)(intra_error / DOUBLE_DIVIDE_CHECK(coded_error));
1514 }
1515
1516 // Calculate the total bits to allocate in this GF/ARF group.
calculate_total_gf_group_bits(AV1_COMP * cpi,double gf_group_err)1517 static int64_t calculate_total_gf_group_bits(AV1_COMP *cpi,
1518 double gf_group_err) {
1519 const RATE_CONTROL *const rc = &cpi->rc;
1520 const TWO_PASS *const twopass = &cpi->twopass;
1521 const int max_bits = frame_max_bits(rc, &cpi->oxcf);
1522 int64_t total_group_bits;
1523
1524 // Calculate the bits to be allocated to the group as a whole.
1525 if ((twopass->kf_group_bits > 0) && (twopass->kf_group_error_left > 0)) {
1526 total_group_bits = (int64_t)(twopass->kf_group_bits *
1527 (gf_group_err / twopass->kf_group_error_left));
1528 } else {
1529 total_group_bits = 0;
1530 }
1531
1532 // Clamp odd edge cases.
1533 total_group_bits = (total_group_bits < 0)
1534 ? 0
1535 : (total_group_bits > twopass->kf_group_bits)
1536 ? twopass->kf_group_bits
1537 : total_group_bits;
1538
1539 // Clip based on user supplied data rate variability limit.
1540 if (total_group_bits > (int64_t)max_bits * rc->baseline_gf_interval)
1541 total_group_bits = (int64_t)max_bits * rc->baseline_gf_interval;
1542
1543 return total_group_bits;
1544 }
1545
1546 // Calculate the number bits extra to assign to boosted frames in a group.
calculate_boost_bits(int frame_count,int boost,int64_t total_group_bits)1547 static int calculate_boost_bits(int frame_count, int boost,
1548 int64_t total_group_bits) {
1549 int allocation_chunks;
1550
1551 // return 0 for invalid inputs (could arise e.g. through rounding errors)
1552 if (!boost || (total_group_bits <= 0) || (frame_count <= 0)) return 0;
1553
1554 allocation_chunks = (frame_count * 100) + boost;
1555
1556 // Prevent overflow.
1557 if (boost > 1023) {
1558 int divisor = boost >> 10;
1559 boost /= divisor;
1560 allocation_chunks /= divisor;
1561 }
1562
1563 // Calculate the number of extra bits for use in the boosted frame or frames.
1564 return AOMMAX((int)(((int64_t)boost * total_group_bits) / allocation_chunks),
1565 0);
1566 }
1567
1568 #if USE_SYMM_MULTI_LAYER
1569 // #define CHCEK_GF_PARAMETER
1570 #ifdef CHCEK_GF_PARAMETER
check_frame_params(GF_GROUP * const gf_group,int gf_interval,int frame_nums)1571 void check_frame_params(GF_GROUP *const gf_group, int gf_interval,
1572 int frame_nums) {
1573 static const char *update_type_strings[] = {
1574 "KF_UPDATE", "LF_UPDATE", "GF_UPDATE",
1575 "ARF_UPDATE", "OVERLAY_UPDATE", "BRF_UPDATE",
1576 "LAST_BIPRED_UPDATE", "BIPRED_UPDATE", "INTNL_OVERLAY_UPDATE",
1577 "INTNL_ARF_UPDATE"
1578 };
1579 FILE *fid = fopen("GF_PARAMS.txt", "a");
1580
1581 fprintf(fid, "\n{%d}\n", gf_interval);
1582 for (int i = 0; i <= frame_nums; ++i) {
1583 fprintf(fid, "%s %d %d %d %d\n",
1584 update_type_strings[gf_group->update_type[i]],
1585 gf_group->arf_src_offset[i], gf_group->arf_pos_in_gf[i],
1586 gf_group->arf_update_idx[i], gf_group->pyramid_level[i]);
1587 }
1588
1589 fprintf(fid, "number of nodes in each level: \n");
1590 for (int i = 0; i < MAX_PYRAMID_LVL; ++i) {
1591 fprintf(fid, "lvl %d: %d ", i, gf_group->pyramid_lvl_nodes[i]);
1592 }
1593 fprintf(fid, "\n");
1594 fclose(fid);
1595 }
1596 #endif // CHCEK_GF_PARAMETER
update_type_2_rf_level(FRAME_UPDATE_TYPE update_type)1597 static int update_type_2_rf_level(FRAME_UPDATE_TYPE update_type) {
1598 // Derive rf_level from update_type
1599 switch (update_type) {
1600 case LF_UPDATE: return INTER_NORMAL;
1601 case ARF_UPDATE: return GF_ARF_STD;
1602 case OVERLAY_UPDATE: return INTER_NORMAL;
1603 case BRF_UPDATE: return GF_ARF_LOW;
1604 case LAST_BIPRED_UPDATE: return INTER_NORMAL;
1605 case BIPRED_UPDATE: return INTER_NORMAL;
1606 case INTNL_ARF_UPDATE: return GF_ARF_LOW;
1607 case INTNL_OVERLAY_UPDATE: return INTER_NORMAL;
1608 default: return INTER_NORMAL;
1609 }
1610 }
1611
set_multi_layer_params(GF_GROUP * const gf_group,int l,int r,int * frame_ind,int arf_ind,int level)1612 static void set_multi_layer_params(GF_GROUP *const gf_group, int l, int r,
1613 int *frame_ind, int arf_ind, int level) {
1614 if (r - l < 4) {
1615 while (++l < r) {
1616 // leaf nodes, not a look-ahead frame
1617 gf_group->update_type[*frame_ind] = LF_UPDATE;
1618 gf_group->arf_src_offset[*frame_ind] = 0;
1619 gf_group->arf_pos_in_gf[*frame_ind] = 0;
1620 gf_group->arf_update_idx[*frame_ind] = arf_ind;
1621 gf_group->pyramid_level[*frame_ind] = 0;
1622 ++gf_group->pyramid_lvl_nodes[0];
1623 ++(*frame_ind);
1624 }
1625 } else {
1626 int m = (l + r) / 2;
1627 int arf_pos_in_gf = *frame_ind;
1628
1629 gf_group->update_type[*frame_ind] = INTNL_ARF_UPDATE;
1630 gf_group->arf_src_offset[*frame_ind] = m - l - 1;
1631 gf_group->arf_pos_in_gf[*frame_ind] = 0;
1632 gf_group->arf_update_idx[*frame_ind] = 1; // mark all internal ARF 1
1633 gf_group->pyramid_level[*frame_ind] = level;
1634 ++gf_group->pyramid_lvl_nodes[level];
1635 ++(*frame_ind);
1636
1637 // set parameters for frames displayed before this frame
1638 set_multi_layer_params(gf_group, l, m, frame_ind, 1, level - 1);
1639
1640 // for overlay frames, we need to record the position of its corresponding
1641 // arf frames for bit allocation
1642 gf_group->update_type[*frame_ind] = INTNL_OVERLAY_UPDATE;
1643 gf_group->arf_src_offset[*frame_ind] = 0;
1644 gf_group->arf_pos_in_gf[*frame_ind] = arf_pos_in_gf;
1645 gf_group->arf_update_idx[*frame_ind] = 1;
1646 gf_group->pyramid_level[*frame_ind] = 0;
1647 ++(*frame_ind);
1648
1649 // set parameters for frames displayed after this frame
1650 set_multi_layer_params(gf_group, m, r, frame_ind, arf_ind, level - 1);
1651 }
1652 }
1653
get_pyramid_height(int pyramid_width)1654 static INLINE unsigned char get_pyramid_height(int pyramid_width) {
1655 assert(pyramid_width <= 16 && pyramid_width >= 4 &&
1656 "invalid gf interval for pyramid structure");
1657
1658 return pyramid_width > 12 ? 4 : (pyramid_width > 6 ? 3 : 2);
1659 }
1660
construct_multi_layer_gf_structure(GF_GROUP * const gf_group,const int gf_interval)1661 static int construct_multi_layer_gf_structure(GF_GROUP *const gf_group,
1662 const int gf_interval) {
1663 int frame_index = 0;
1664 gf_group->pyramid_height = get_pyramid_height(gf_interval);
1665
1666 assert(gf_group->pyramid_height <= MAX_PYRAMID_LVL);
1667
1668 av1_zero_array(gf_group->pyramid_lvl_nodes, MAX_PYRAMID_LVL);
1669
1670 // At the beginning of each GF group it will be a key or overlay frame,
1671 gf_group->update_type[frame_index] = OVERLAY_UPDATE;
1672 gf_group->arf_src_offset[frame_index] = 0;
1673 gf_group->arf_pos_in_gf[frame_index] = 0;
1674 gf_group->arf_update_idx[frame_index] = 0;
1675 gf_group->pyramid_level[frame_index] = 0;
1676 ++frame_index;
1677
1678 // ALT0
1679 gf_group->update_type[frame_index] = ARF_UPDATE;
1680 gf_group->arf_src_offset[frame_index] = gf_interval - 1;
1681 gf_group->arf_pos_in_gf[frame_index] = 0;
1682 gf_group->arf_update_idx[frame_index] = 0;
1683 gf_group->pyramid_level[frame_index] = gf_group->pyramid_height;
1684 ++frame_index;
1685
1686 // set parameters for the rest of the frames
1687 set_multi_layer_params(gf_group, 0, gf_interval, &frame_index, 0,
1688 gf_group->pyramid_height - 1);
1689 return frame_index;
1690 }
1691
define_customized_gf_group_structure(AV1_COMP * cpi)1692 void define_customized_gf_group_structure(AV1_COMP *cpi) {
1693 RATE_CONTROL *const rc = &cpi->rc;
1694 TWO_PASS *const twopass = &cpi->twopass;
1695 GF_GROUP *const gf_group = &twopass->gf_group;
1696 const int key_frame = cpi->common.frame_type == KEY_FRAME;
1697
1698 assert(rc->baseline_gf_interval >= 4 &&
1699 rc->baseline_gf_interval <= MAX_PYRAMID_SIZE);
1700
1701 const int gf_update_frames =
1702 construct_multi_layer_gf_structure(gf_group, rc->baseline_gf_interval);
1703 int frame_index;
1704
1705 cpi->num_extra_arfs = 0;
1706
1707 for (frame_index = 0; frame_index < gf_update_frames; ++frame_index) {
1708 // Set unused variables to default values
1709 gf_group->bidir_pred_enabled[frame_index] = 0;
1710 gf_group->brf_src_offset[frame_index] = 0;
1711
1712 // Special handle for the first frame for assigning update_type
1713 if (frame_index == 0) {
1714 // For key frames the frame target rate is already set and it
1715 // is also the golden frame.
1716 if (key_frame) {
1717 gf_group->update_type[frame_index] = KF_UPDATE;
1718 continue;
1719 }
1720
1721 if (rc->source_alt_ref_active) {
1722 gf_group->update_type[frame_index] = OVERLAY_UPDATE;
1723 } else {
1724 gf_group->update_type[frame_index] = GF_UPDATE;
1725 }
1726 } else {
1727 if (gf_group->update_type[frame_index] == INTNL_ARF_UPDATE)
1728 ++cpi->num_extra_arfs;
1729 }
1730
1731 // Assign rf level based on update type
1732 gf_group->rf_level[frame_index] =
1733 update_type_2_rf_level(gf_group->update_type[frame_index]);
1734 }
1735
1736 // NOTE: We need to configure the frame at the end of the sequence + 1 that
1737 // will be the start frame for the next group. Otherwise prior to the
1738 // call to av1_rc_get_second_pass_params() the data will be undefined.
1739 if (rc->source_alt_ref_pending) {
1740 gf_group->update_type[frame_index] = OVERLAY_UPDATE;
1741 gf_group->rf_level[frame_index] = INTER_NORMAL;
1742 } else {
1743 gf_group->update_type[frame_index] = GF_UPDATE;
1744 gf_group->rf_level[frame_index] = GF_ARF_STD;
1745 }
1746
1747 gf_group->bidir_pred_enabled[frame_index] = 0;
1748 gf_group->brf_src_offset[frame_index] = 0;
1749 gf_group->arf_update_idx[frame_index] = 0;
1750 // This value is only used for INTNL_OVERLAY_UPDATE
1751 gf_group->arf_pos_in_gf[frame_index] = 0;
1752
1753 // This parameter is useless?
1754 gf_group->arf_ref_idx[frame_index] = 0;
1755 #ifdef CHCEK_GF_PARAMETER
1756 check_frame_params(gf_group, rc->baseline_gf_interval, gf_update_frames);
1757 #endif
1758 }
1759
1760 // It is an example of how to define a GF stucture manually. The function will
1761 // result in exactly the same GF group structure as
1762 // define_customized_gf_group_structure() when rc->baseline_gf_interval == 4
1763 #if USE_MANUAL_GF4_STRUCT
1764 #define GF_INTERVAL_4 4
1765 static const unsigned char gf4_multi_layer_params[][GF_FRAME_PARAMS] = {
1766 {
1767 // gf_group->index == 0 (Frame 0)
1768 // It can also be KEY frame. Will assign the proper value
1769 // in define_gf_group_structure
1770 OVERLAY_UPDATE, // update_type (default value)
1771 0, // arf_src_offset
1772 0, // arf_pos_in_gf
1773 0 // arf_update_idx
1774 },
1775 {
1776 // gf_group->index == 1 (Frame 4)
1777 ARF_UPDATE, // update_type
1778 GF_INTERVAL_4 - 1, // arf_src_offset
1779 0, // arf_pos_in_gf
1780 0 // arf_update_idx
1781 },
1782 {
1783 // gf_group->index == 2 (Frame 2)
1784 INTNL_ARF_UPDATE, // update_type
1785 (GF_INTERVAL_4 >> 1) - 1, // arf_src_offset
1786 0, // arf_pos_in_gf
1787 0 // arf_update_idx
1788 },
1789 {
1790 // gf_group->index == 3 (Frame 1)
1791 LAST_BIPRED_UPDATE, // update_type
1792 0, // arf_src_offset
1793 0, // arf_pos_in_gf
1794 0 // arf_update_idx
1795 },
1796
1797 {
1798 // gf_group->index == 4 (Frame 2 - OVERLAY)
1799 INTNL_OVERLAY_UPDATE, // update_type
1800 0, // arf_src_offset
1801 2, // arf_pos_in_gf
1802 0 // arf_update_idx
1803 },
1804 {
1805 // gf_group->index == 5 (Frame 3)
1806 LF_UPDATE, // update_type
1807 0, // arf_src_offset
1808 0, // arf_pos_in_gf
1809 1 // arf_update_idx
1810 }
1811 };
1812
define_gf_group_structure_4(AV1_COMP * cpi)1813 static int define_gf_group_structure_4(AV1_COMP *cpi) {
1814 RATE_CONTROL *const rc = &cpi->rc;
1815 TWO_PASS *const twopass = &cpi->twopass;
1816 GF_GROUP *const gf_group = &twopass->gf_group;
1817 const int key_frame = cpi->common.frame_type == KEY_FRAME;
1818
1819 assert(rc->baseline_gf_interval == GF_INTERVAL_4);
1820
1821 const int gf_update_frames = rc->baseline_gf_interval + 2;
1822 int frame_index;
1823
1824 for (frame_index = 0; frame_index < gf_update_frames; ++frame_index) {
1825 int param_idx = 0;
1826
1827 gf_group->bidir_pred_enabled[frame_index] = 0;
1828
1829 if (frame_index == 0) {
1830 // gf_group->arf_src_offset[frame_index] = 0;
1831 gf_group->brf_src_offset[frame_index] = 0;
1832 gf_group->bidir_pred_enabled[frame_index] = 0;
1833
1834 // For key frames the frame target rate is already set and it
1835 // is also the golden frame.
1836 if (key_frame) continue;
1837
1838 gf_group->update_type[frame_index] =
1839 gf4_multi_layer_params[frame_index][param_idx++];
1840
1841 if (rc->source_alt_ref_active) {
1842 gf_group->update_type[frame_index] = OVERLAY_UPDATE;
1843 } else {
1844 gf_group->update_type[frame_index] = GF_UPDATE;
1845 }
1846 param_idx++;
1847 } else {
1848 gf_group->update_type[frame_index] =
1849 gf4_multi_layer_params[frame_index][param_idx++];
1850 }
1851
1852 // setup other parameters
1853 gf_group->rf_level[frame_index] =
1854 update_type_2_rf_level(gf_group->update_type[frame_index]);
1855
1856 // == arf_src_offset ==
1857 gf_group->arf_src_offset[frame_index] =
1858 gf4_multi_layer_params[frame_index][param_idx++];
1859
1860 // == arf_pos_in_gf ==
1861 gf_group->arf_pos_in_gf[frame_index] =
1862 gf4_multi_layer_params[frame_index][param_idx++];
1863
1864 // == arf_update_idx ==
1865 gf_group->brf_src_offset[frame_index] =
1866 gf4_multi_layer_params[frame_index][param_idx];
1867 }
1868
1869 // NOTE: We need to configure the frame at the end of the sequence + 1 that
1870 // will be the start frame for the next group. Otherwise prior to the
1871 // call to av1_rc_get_second_pass_params() the data will be undefined.
1872 gf_group->arf_update_idx[frame_index] = 0;
1873 gf_group->arf_ref_idx[frame_index] = 0;
1874
1875 if (rc->source_alt_ref_pending) {
1876 gf_group->update_type[frame_index] = OVERLAY_UPDATE;
1877 gf_group->rf_level[frame_index] = INTER_NORMAL;
1878
1879 } else {
1880 gf_group->update_type[frame_index] = GF_UPDATE;
1881 gf_group->rf_level[frame_index] = GF_ARF_STD;
1882 }
1883
1884 gf_group->bidir_pred_enabled[frame_index] = 0;
1885 gf_group->brf_src_offset[frame_index] = 0;
1886
1887 // This value is only used for INTNL_OVERLAY_UPDATE
1888 gf_group->arf_pos_in_gf[frame_index] = 0;
1889
1890 return gf_update_frames;
1891 }
1892 #endif // USE_MANUAL_GF4_STRUCT
1893 #endif // USE_SYMM_MULTI_LAYER
1894
define_gf_group_structure(AV1_COMP * cpi)1895 static void define_gf_group_structure(AV1_COMP *cpi) {
1896 RATE_CONTROL *const rc = &cpi->rc;
1897
1898 #if USE_SYMM_MULTI_LAYER
1899 const int valid_customized_gf_length =
1900 rc->baseline_gf_interval >= 4 &&
1901 rc->baseline_gf_interval <= MAX_PYRAMID_SIZE;
1902 // used the new structure only if extra_arf is allowed
1903 if (valid_customized_gf_length && rc->source_alt_ref_pending &&
1904 cpi->extra_arf_allowed > 0) {
1905 #if USE_MANUAL_GF4_STRUCT
1906 if (rc->baseline_gf_interval == 4)
1907 define_gf_group_structure_4(cpi);
1908 else
1909 #endif
1910 define_customized_gf_group_structure(cpi);
1911 cpi->new_bwdref_update_rule = 1;
1912 return;
1913 } else {
1914 cpi->new_bwdref_update_rule = 0;
1915 }
1916 #endif
1917
1918 TWO_PASS *const twopass = &cpi->twopass;
1919 GF_GROUP *const gf_group = &twopass->gf_group;
1920 int i;
1921 int frame_index = 0;
1922 const int key_frame = cpi->common.frame_type == KEY_FRAME;
1923
1924 // The use of bi-predictive frames are only enabled when following 3
1925 // conditions are met:
1926 // (1) ALTREF is enabled;
1927 // (2) The bi-predictive group interval is at least 2; and
1928 // (3) The bi-predictive group interval is strictly smaller than the
1929 // golden group interval.
1930 const int is_bipred_enabled =
1931 cpi->extra_arf_allowed && rc->source_alt_ref_pending &&
1932 rc->bipred_group_interval &&
1933 rc->bipred_group_interval <=
1934 (rc->baseline_gf_interval - rc->source_alt_ref_pending);
1935 int bipred_group_end = 0;
1936 int bipred_frame_index = 0;
1937
1938 const unsigned char ext_arf_interval =
1939 (unsigned char)(rc->baseline_gf_interval / (cpi->num_extra_arfs + 1) - 1);
1940 int which_arf = cpi->num_extra_arfs;
1941 int subgroup_interval[MAX_EXT_ARFS + 1];
1942 int is_sg_bipred_enabled = is_bipred_enabled;
1943 int accumulative_subgroup_interval = 0;
1944
1945 // For key frames the frame target rate is already set and it
1946 // is also the golden frame.
1947 // === [frame_index == 0] ===
1948 if (!key_frame) {
1949 if (rc->source_alt_ref_active) {
1950 gf_group->update_type[frame_index] = OVERLAY_UPDATE;
1951 gf_group->rf_level[frame_index] = INTER_NORMAL;
1952 } else {
1953 gf_group->update_type[frame_index] = GF_UPDATE;
1954 gf_group->rf_level[frame_index] = GF_ARF_STD;
1955 }
1956 gf_group->arf_update_idx[frame_index] = 0;
1957 gf_group->arf_ref_idx[frame_index] = 0;
1958 }
1959
1960 gf_group->bidir_pred_enabled[frame_index] = 0;
1961 gf_group->brf_src_offset[frame_index] = 0;
1962
1963 frame_index++;
1964
1965 bipred_frame_index++;
1966
1967 // === [frame_index == 1] ===
1968 if (rc->source_alt_ref_pending) {
1969 gf_group->update_type[frame_index] = ARF_UPDATE;
1970 gf_group->rf_level[frame_index] = GF_ARF_STD;
1971 gf_group->arf_src_offset[frame_index] =
1972 (unsigned char)(rc->baseline_gf_interval - 1);
1973
1974 gf_group->arf_update_idx[frame_index] = 0;
1975 gf_group->arf_ref_idx[frame_index] = 0;
1976
1977 gf_group->bidir_pred_enabled[frame_index] = 0;
1978 gf_group->brf_src_offset[frame_index] = 0;
1979 // NOTE: "bidir_pred_frame_index" stays unchanged for ARF_UPDATE frames.
1980
1981 // Work out the ARFs' positions in this gf group
1982 // NOTE(weitinglin): ALT_REFs' are indexed inversely, but coded in display
1983 // order (except for the original ARF). In the example of three ALT_REF's,
1984 // We index ALTREF's as: KEY ----- ALT2 ----- ALT1 ----- ALT0
1985 // but code them in the following order:
1986 // KEY-ALT0-ALT2 ----- OVERLAY2-ALT1 ----- OVERLAY1 ----- OVERLAY0
1987 //
1988 // arf_pos_for_ovrly[]: Position for OVERLAY
1989 // arf_pos_in_gf[]: Position for ALTREF
1990 cpi->arf_pos_for_ovrly[0] = frame_index + cpi->num_extra_arfs +
1991 gf_group->arf_src_offset[frame_index] + 1;
1992 for (i = 0; i < cpi->num_extra_arfs; ++i) {
1993 cpi->arf_pos_for_ovrly[i + 1] =
1994 frame_index + (cpi->num_extra_arfs - i) * (ext_arf_interval + 2);
1995 subgroup_interval[i] = cpi->arf_pos_for_ovrly[i] -
1996 cpi->arf_pos_for_ovrly[i + 1] - (i == 0 ? 1 : 2);
1997 }
1998 subgroup_interval[cpi->num_extra_arfs] =
1999 cpi->arf_pos_for_ovrly[cpi->num_extra_arfs] - frame_index -
2000 (cpi->num_extra_arfs == 0 ? 1 : 2);
2001
2002 ++frame_index;
2003
2004 // Insert an extra ARF
2005 // === [frame_index == 2] ===
2006 if (cpi->num_extra_arfs) {
2007 gf_group->update_type[frame_index] = INTNL_ARF_UPDATE;
2008 gf_group->rf_level[frame_index] = GF_ARF_LOW;
2009 gf_group->arf_src_offset[frame_index] = ext_arf_interval;
2010
2011 gf_group->arf_update_idx[frame_index] = which_arf;
2012 gf_group->arf_ref_idx[frame_index] = 0;
2013 ++frame_index;
2014 }
2015 accumulative_subgroup_interval += subgroup_interval[cpi->num_extra_arfs];
2016 }
2017
2018 for (i = 0; i < rc->baseline_gf_interval - rc->source_alt_ref_pending; ++i) {
2019 gf_group->arf_update_idx[frame_index] = which_arf;
2020 gf_group->arf_ref_idx[frame_index] = which_arf;
2021
2022 // If we are going to have ARFs, check whether we can have BWDREF in this
2023 // subgroup, and further, whether we can have ARF subgroup which contains
2024 // the BWDREF subgroup but contained within the GF group:
2025 //
2026 // GF group --> ARF subgroup --> BWDREF subgroup
2027 if (rc->source_alt_ref_pending) {
2028 is_sg_bipred_enabled =
2029 is_bipred_enabled &&
2030 (subgroup_interval[which_arf] > rc->bipred_group_interval);
2031 }
2032
2033 // NOTE: BIDIR_PRED is only enabled when the length of the bi-predictive
2034 // frame group interval is strictly smaller than that of the GOLDEN
2035 // FRAME group interval.
2036 // TODO(zoeliu): Currently BIDIR_PRED is only enabled when alt-ref is on.
2037 if (is_sg_bipred_enabled && !bipred_group_end) {
2038 const int cur_brf_src_offset = rc->bipred_group_interval - 1;
2039
2040 if (bipred_frame_index == 1) {
2041 // --- BRF_UPDATE ---
2042 gf_group->update_type[frame_index] = BRF_UPDATE;
2043 gf_group->rf_level[frame_index] = GF_ARF_LOW;
2044 gf_group->brf_src_offset[frame_index] = cur_brf_src_offset;
2045 } else if (bipred_frame_index == rc->bipred_group_interval) {
2046 // --- LAST_BIPRED_UPDATE ---
2047 gf_group->update_type[frame_index] = LAST_BIPRED_UPDATE;
2048 gf_group->rf_level[frame_index] = INTER_NORMAL;
2049 gf_group->brf_src_offset[frame_index] = 0;
2050
2051 // Reset the bi-predictive frame index.
2052 bipred_frame_index = 0;
2053 } else {
2054 // --- BIPRED_UPDATE ---
2055 gf_group->update_type[frame_index] = BIPRED_UPDATE;
2056 gf_group->rf_level[frame_index] = INTER_NORMAL;
2057 gf_group->brf_src_offset[frame_index] = 0;
2058 }
2059 gf_group->bidir_pred_enabled[frame_index] = 1;
2060
2061 bipred_frame_index++;
2062 // Check whether the next bi-predictive frame group would entirely be
2063 // included within the current golden frame group.
2064 // In addition, we need to avoid coding a BRF right before an ARF.
2065 if (bipred_frame_index == 1 &&
2066 (i + 2 + cur_brf_src_offset) >= accumulative_subgroup_interval) {
2067 bipred_group_end = 1;
2068 }
2069 } else {
2070 gf_group->update_type[frame_index] = LF_UPDATE;
2071 gf_group->rf_level[frame_index] = INTER_NORMAL;
2072 gf_group->bidir_pred_enabled[frame_index] = 0;
2073 gf_group->brf_src_offset[frame_index] = 0;
2074 }
2075
2076 ++frame_index;
2077
2078 // Check if we need to update the ARF.
2079 if (is_sg_bipred_enabled && cpi->num_extra_arfs && which_arf > 0 &&
2080 frame_index > cpi->arf_pos_for_ovrly[which_arf]) {
2081 --which_arf;
2082 accumulative_subgroup_interval += subgroup_interval[which_arf] + 1;
2083
2084 // Meet the new subgroup; Reset the bipred_group_end flag.
2085 bipred_group_end = 0;
2086 // Insert another extra ARF after the overlay frame
2087 if (which_arf) {
2088 gf_group->update_type[frame_index] = INTNL_ARF_UPDATE;
2089 gf_group->rf_level[frame_index] = GF_ARF_LOW;
2090 gf_group->arf_src_offset[frame_index] = ext_arf_interval;
2091
2092 gf_group->arf_update_idx[frame_index] = which_arf;
2093 gf_group->arf_ref_idx[frame_index] = 0;
2094 ++frame_index;
2095 }
2096 }
2097 }
2098
2099 // NOTE: We need to configure the frame at the end of the sequence + 1 that
2100 // will be the start frame for the next group. Otherwise prior to the
2101 // call to av1_rc_get_second_pass_params() the data will be undefined.
2102 gf_group->arf_update_idx[frame_index] = 0;
2103 gf_group->arf_ref_idx[frame_index] = 0;
2104
2105 if (rc->source_alt_ref_pending) {
2106 gf_group->update_type[frame_index] = OVERLAY_UPDATE;
2107 gf_group->rf_level[frame_index] = INTER_NORMAL;
2108
2109 cpi->arf_pos_in_gf[0] = 1;
2110 if (cpi->num_extra_arfs) {
2111 // Overwrite the update_type for extra-ARF's corresponding internal
2112 // OVERLAY's: Change from LF_UPDATE to INTNL_OVERLAY_UPDATE.
2113 for (i = cpi->num_extra_arfs; i > 0; --i) {
2114 cpi->arf_pos_in_gf[i] =
2115 (i == cpi->num_extra_arfs ? 2 : cpi->arf_pos_for_ovrly[i + 1] + 1);
2116
2117 gf_group->update_type[cpi->arf_pos_for_ovrly[i]] = INTNL_OVERLAY_UPDATE;
2118 gf_group->rf_level[cpi->arf_pos_for_ovrly[i]] = INTER_NORMAL;
2119 }
2120 }
2121 } else {
2122 gf_group->update_type[frame_index] = GF_UPDATE;
2123 gf_group->rf_level[frame_index] = GF_ARF_STD;
2124 }
2125
2126 gf_group->bidir_pred_enabled[frame_index] = 0;
2127 gf_group->brf_src_offset[frame_index] = 0;
2128 }
2129
2130 #if USE_SYMM_MULTI_LAYER
2131 #define LEAF_REDUCTION_FACTOR 0.75f
2132 #define LVL_3_BOOST_FACTOR 0.8f
2133 #define LVL_2_BOOST_FACTOR 0.3f
2134
2135 static float_t lvl_budget_factor[MAX_PYRAMID_LVL - 1][MAX_PYRAMID_LVL - 1] = {
2136 { 1, 0, 0 },
2137 { LVL_3_BOOST_FACTOR, 0, 0 }, // Leaking budget works better
2138 { LVL_3_BOOST_FACTOR, (1 - LVL_3_BOOST_FACTOR) * LVL_2_BOOST_FACTOR,
2139 (1 - LVL_3_BOOST_FACTOR) * (1 - LVL_2_BOOST_FACTOR) }
2140 };
2141 #endif // USE_SYMM_MULTI_LAYER
allocate_gf_group_bits(AV1_COMP * cpi,int64_t gf_group_bits,double group_error,int gf_arf_bits)2142 static void allocate_gf_group_bits(AV1_COMP *cpi, int64_t gf_group_bits,
2143 double group_error, int gf_arf_bits) {
2144 RATE_CONTROL *const rc = &cpi->rc;
2145 const AV1EncoderConfig *const oxcf = &cpi->oxcf;
2146 TWO_PASS *const twopass = &cpi->twopass;
2147 GF_GROUP *const gf_group = &twopass->gf_group;
2148 FIRSTPASS_STATS frame_stats;
2149 int i;
2150 int frame_index = 0;
2151 int target_frame_size;
2152 int key_frame;
2153 const int max_bits = frame_max_bits(&cpi->rc, &cpi->oxcf);
2154 int64_t total_group_bits = gf_group_bits;
2155 double modified_err = 0.0;
2156 double err_fraction;
2157 int ext_arf_boost[MAX_EXT_ARFS];
2158
2159 define_gf_group_structure(cpi);
2160
2161 av1_zero_array(ext_arf_boost, MAX_EXT_ARFS);
2162
2163 key_frame = cpi->common.frame_type == KEY_FRAME;
2164
2165 // For key frames the frame target rate is already set and it
2166 // is also the golden frame.
2167 // === [frame_index == 0] ===
2168 if (!key_frame) {
2169 if (rc->source_alt_ref_active)
2170 gf_group->bit_allocation[frame_index] = 0;
2171 else
2172 gf_group->bit_allocation[frame_index] = gf_arf_bits;
2173
2174 // Step over the golden frame / overlay frame
2175 if (EOF == input_stats(twopass, &frame_stats)) return;
2176 }
2177
2178 // Deduct the boost bits for arf (or gf if it is not a key frame)
2179 // from the group total.
2180 if (rc->source_alt_ref_pending || !key_frame) total_group_bits -= gf_arf_bits;
2181
2182 frame_index++;
2183
2184 // Store the bits to spend on the ARF if there is one.
2185 // === [frame_index == 1] ===
2186 if (rc->source_alt_ref_pending) {
2187 gf_group->bit_allocation[frame_index] = gf_arf_bits;
2188
2189 ++frame_index;
2190
2191 // Skip all the extra-ARF's right after ARF at the starting segment of
2192 // the current GF group.
2193 if (cpi->num_extra_arfs) {
2194 while (gf_group->update_type[frame_index] == INTNL_ARF_UPDATE)
2195 ++frame_index;
2196 }
2197 }
2198
2199 // Allocate bits to the other frames in the group.
2200 for (i = 0; i < rc->baseline_gf_interval - rc->source_alt_ref_pending; ++i) {
2201 if (EOF == input_stats(twopass, &frame_stats)) break;
2202
2203 modified_err = calculate_modified_err(cpi, twopass, oxcf, &frame_stats);
2204
2205 if (group_error > 0)
2206 err_fraction = modified_err / DOUBLE_DIVIDE_CHECK(group_error);
2207 else
2208 err_fraction = 0.0;
2209
2210 target_frame_size = (int)((double)total_group_bits * err_fraction);
2211
2212 target_frame_size =
2213 clamp(target_frame_size, 0, AOMMIN(max_bits, (int)total_group_bits));
2214
2215 if (gf_group->update_type[frame_index] == BRF_UPDATE) {
2216 // Boost up the allocated bits on BWDREF_FRAME
2217 gf_group->bit_allocation[frame_index] =
2218 target_frame_size + (target_frame_size >> 2);
2219 } else if (gf_group->update_type[frame_index] == LAST_BIPRED_UPDATE) {
2220 // Press down the allocated bits on LAST_BIPRED_UPDATE frames
2221 gf_group->bit_allocation[frame_index] =
2222 target_frame_size - (target_frame_size >> 1);
2223 } else if (gf_group->update_type[frame_index] == BIPRED_UPDATE) {
2224 // TODO(zoeliu): To investigate whether the allocated bits on
2225 // BIPRED_UPDATE frames need to be further adjusted.
2226 gf_group->bit_allocation[frame_index] = target_frame_size;
2227 #if USE_SYMM_MULTI_LAYER
2228 } else if (cpi->new_bwdref_update_rule &&
2229 gf_group->update_type[frame_index] == INTNL_OVERLAY_UPDATE) {
2230 assert(gf_group->pyramid_height <= MAX_PYRAMID_LVL &&
2231 gf_group->pyramid_height >= 0 &&
2232 "non-valid height for a pyramid structure");
2233
2234 int arf_pos = gf_group->arf_pos_in_gf[frame_index];
2235 gf_group->bit_allocation[frame_index] = 0;
2236
2237 gf_group->bit_allocation[arf_pos] = target_frame_size;
2238 #if MULTI_LVL_BOOST_VBR_CQ
2239 const int pyr_h = gf_group->pyramid_height - 2;
2240 const int this_lvl = gf_group->pyramid_level[arf_pos];
2241 const int dist2top = gf_group->pyramid_height - 1 - this_lvl;
2242
2243 const float_t budget =
2244 LEAF_REDUCTION_FACTOR * gf_group->pyramid_lvl_nodes[0];
2245 const float_t lvl_boost = budget * lvl_budget_factor[pyr_h][dist2top] /
2246 gf_group->pyramid_lvl_nodes[this_lvl];
2247
2248 gf_group->bit_allocation[arf_pos] += (int)(target_frame_size * lvl_boost);
2249 #endif // MULTI_LVL_BOOST_VBR_CQ
2250 #endif // USE_SYMM_MULTI_LAYER
2251 } else {
2252 assert(gf_group->update_type[frame_index] == LF_UPDATE ||
2253 gf_group->update_type[frame_index] == INTNL_OVERLAY_UPDATE);
2254 gf_group->bit_allocation[frame_index] = target_frame_size;
2255 #if MULTI_LVL_BOOST_VBR_CQ
2256 if (cpi->new_bwdref_update_rule) {
2257 gf_group->bit_allocation[frame_index] -=
2258 (int)(target_frame_size * LEAF_REDUCTION_FACTOR);
2259 }
2260 #endif // MULTI_LVL_BOOST_VBR_CQ
2261 }
2262
2263 ++frame_index;
2264
2265 // Skip all the extra-ARF's.
2266 if (cpi->num_extra_arfs) {
2267 while (gf_group->update_type[frame_index] == INTNL_ARF_UPDATE)
2268 ++frame_index;
2269 }
2270 }
2271
2272 #if USE_SYMM_MULTI_LAYER
2273 if (cpi->new_bwdref_update_rule == 0 && rc->source_alt_ref_pending) {
2274 #else
2275 if (rc->source_alt_ref_pending) {
2276 #endif
2277 if (cpi->num_extra_arfs) {
2278 // NOTE: For bit allocation, move the allocated bits associated with
2279 // INTNL_OVERLAY_UPDATE to the corresponding INTNL_ARF_UPDATE.
2280 // i > 0 for extra-ARF's and i == 0 for ARF:
2281 // arf_pos_for_ovrly[i]: Position for INTNL_OVERLAY_UPDATE
2282 // arf_pos_in_gf[i]: Position for INTNL_ARF_UPDATE
2283 for (i = cpi->num_extra_arfs; i > 0; --i) {
2284 assert(gf_group->update_type[cpi->arf_pos_for_ovrly[i]] ==
2285 INTNL_OVERLAY_UPDATE);
2286
2287 // Encoder's choice:
2288 // Set show_existing_frame == 1 for all extra-ARF's, and hence
2289 // allocate zero bit for both all internal OVERLAY frames.
2290 gf_group->bit_allocation[cpi->arf_pos_in_gf[i]] =
2291 gf_group->bit_allocation[cpi->arf_pos_for_ovrly[i]];
2292 gf_group->bit_allocation[cpi->arf_pos_for_ovrly[i]] = 0;
2293 }
2294 }
2295 }
2296 }
2297
2298 // Analyse and define a gf/arf group.
2299 static void define_gf_group(AV1_COMP *cpi, FIRSTPASS_STATS *this_frame) {
2300 AV1_COMMON *const cm = &cpi->common;
2301 RATE_CONTROL *const rc = &cpi->rc;
2302 AV1EncoderConfig *const oxcf = &cpi->oxcf;
2303 TWO_PASS *const twopass = &cpi->twopass;
2304 FIRSTPASS_STATS next_frame;
2305 const FIRSTPASS_STATS *const start_pos = twopass->stats_in;
2306 int i;
2307
2308 double boost_score = 0.0;
2309 #if !CONFIG_FIX_GF_LENGTH
2310 double old_boost_score = 0.0;
2311 double mv_ratio_accumulator_thresh;
2312 int active_max_gf_interval;
2313 int active_min_gf_interval;
2314 #endif
2315 double gf_group_err = 0.0;
2316 #if GROUP_ADAPTIVE_MAXQ
2317 double gf_group_raw_error = 0.0;
2318 #endif
2319 double gf_group_skip_pct = 0.0;
2320 double gf_group_inactive_zone_rows = 0.0;
2321 double gf_first_frame_err = 0.0;
2322 double mod_frame_err = 0.0;
2323
2324 double mv_ratio_accumulator = 0.0;
2325 double decay_accumulator = 1.0;
2326 double zero_motion_accumulator = 1.0;
2327
2328 double loop_decay_rate = 1.00;
2329 double last_loop_decay_rate = 1.00;
2330
2331 double this_frame_mv_in_out = 0.0;
2332 double mv_in_out_accumulator = 0.0;
2333 double abs_mv_in_out_accumulator = 0.0;
2334
2335 unsigned int allow_alt_ref = is_altref_enabled(cpi);
2336
2337 int f_boost = 0;
2338 int b_boost = 0;
2339 int flash_detected;
2340 int64_t gf_group_bits;
2341 double gf_group_error_left;
2342 int gf_arf_bits;
2343 const int is_key_frame = frame_is_intra_only(cm);
2344 const int arf_active_or_kf = is_key_frame || rc->source_alt_ref_active;
2345
2346 cpi->extra_arf_allowed = 1;
2347
2348 // Reset the GF group data structures unless this is a key
2349 // frame in which case it will already have been done.
2350 if (is_key_frame == 0) {
2351 av1_zero(twopass->gf_group);
2352 }
2353
2354 aom_clear_system_state();
2355 av1_zero(next_frame);
2356
2357 // Load stats for the current frame.
2358 mod_frame_err = calculate_modified_err(cpi, twopass, oxcf, this_frame);
2359
2360 // Note the error of the frame at the start of the group. This will be
2361 // the GF frame error if we code a normal gf.
2362 gf_first_frame_err = mod_frame_err;
2363
2364 // If this is a key frame or the overlay from a previous arf then
2365 // the error score / cost of this frame has already been accounted for.
2366 if (arf_active_or_kf) {
2367 gf_group_err -= gf_first_frame_err;
2368 #if GROUP_ADAPTIVE_MAXQ
2369 gf_group_raw_error -= this_frame->coded_error;
2370 #endif
2371 gf_group_skip_pct -= this_frame->intra_skip_pct;
2372 gf_group_inactive_zone_rows -= this_frame->inactive_zone_rows;
2373 }
2374 #if !CONFIG_FIX_GF_LENGTH
2375 // Motion breakout threshold for loop below depends on image size.
2376 mv_ratio_accumulator_thresh =
2377 (cpi->initial_height + cpi->initial_width) / 4.0;
2378 // Set a maximum and minimum interval for the GF group.
2379 // If the image appears almost completely static we can extend beyond this.
2380 {
2381 int int_max_q = (int)(av1_convert_qindex_to_q(
2382 twopass->active_worst_quality, cpi->common.seq_params.bit_depth));
2383 int int_lbq = (int)(av1_convert_qindex_to_q(
2384 rc->last_boosted_qindex, cpi->common.seq_params.bit_depth));
2385
2386 active_min_gf_interval = rc->min_gf_interval + AOMMIN(2, int_max_q / 200);
2387 if (active_min_gf_interval > rc->max_gf_interval)
2388 active_min_gf_interval = rc->max_gf_interval;
2389
2390 // The value chosen depends on the active Q range. At low Q we have
2391 // bits to spare and are better with a smaller interval and smaller boost.
2392 // At high Q when there are few bits to spare we are better with a longer
2393 // interval to spread the cost of the GF.
2394 active_max_gf_interval = 12 + AOMMIN(4, (int_lbq / 6));
2395
2396 // We have: active_min_gf_interval <= rc->max_gf_interval
2397 if (active_max_gf_interval < active_min_gf_interval)
2398 active_max_gf_interval = active_min_gf_interval;
2399 else if (active_max_gf_interval > rc->max_gf_interval)
2400 active_max_gf_interval = rc->max_gf_interval;
2401 }
2402 #endif // !CONFIG_FIX_GF_LENGTH
2403 double avg_sr_coded_error = 0;
2404 double avg_raw_err_stdev = 0;
2405 int non_zero_stdev_count = 0;
2406
2407 i = 0;
2408 while (i < rc->static_scene_max_gf_interval && i < rc->frames_to_key) {
2409 ++i;
2410
2411 // Accumulate error score of frames in this gf group.
2412 mod_frame_err = calculate_modified_err(cpi, twopass, oxcf, this_frame);
2413 gf_group_err += mod_frame_err;
2414 #if GROUP_ADAPTIVE_MAXQ
2415 gf_group_raw_error += this_frame->coded_error;
2416 #endif
2417 gf_group_skip_pct += this_frame->intra_skip_pct;
2418 gf_group_inactive_zone_rows += this_frame->inactive_zone_rows;
2419
2420 if (EOF == input_stats(twopass, &next_frame)) break;
2421
2422 // Test for the case where there is a brief flash but the prediction
2423 // quality back to an earlier frame is then restored.
2424 flash_detected = detect_flash(twopass, 0);
2425
2426 // Update the motion related elements to the boost calculation.
2427 accumulate_frame_motion_stats(
2428 &next_frame, &this_frame_mv_in_out, &mv_in_out_accumulator,
2429 &abs_mv_in_out_accumulator, &mv_ratio_accumulator);
2430 // sum up the metric values of current gf group
2431 avg_sr_coded_error += next_frame.sr_coded_error;
2432 if (fabs(next_frame.raw_error_stdev) > 0.000001) {
2433 non_zero_stdev_count++;
2434 avg_raw_err_stdev += next_frame.raw_error_stdev;
2435 }
2436
2437 // Accumulate the effect of prediction quality decay.
2438 if (!flash_detected) {
2439 last_loop_decay_rate = loop_decay_rate;
2440 loop_decay_rate = get_prediction_decay_rate(cpi, &next_frame);
2441
2442 decay_accumulator = decay_accumulator * loop_decay_rate;
2443
2444 // Monitor for static sections.
2445 zero_motion_accumulator = AOMMIN(
2446 zero_motion_accumulator, get_zero_motion_factor(cpi, &next_frame));
2447
2448 // Break clause to detect very still sections after motion. For example,
2449 // a static image after a fade or other transition.
2450 if (detect_transition_to_still(cpi, i, 5, loop_decay_rate,
2451 last_loop_decay_rate)) {
2452 allow_alt_ref = 0;
2453 break;
2454 }
2455 }
2456
2457 // Calculate a boost number for this frame.
2458 boost_score +=
2459 decay_accumulator *
2460 calc_frame_boost(cpi, &next_frame, this_frame_mv_in_out, GF_MAX_BOOST);
2461 #if CONFIG_FIX_GF_LENGTH
2462 if (i == (FIXED_GF_LENGTH + 1)) break;
2463 #else
2464 // Skip breaking condition for CONFIG_FIX_GF_LENGTH
2465 // Break out conditions.
2466 if (
2467 // Break at active_max_gf_interval unless almost totally static.
2468 (i >= (active_max_gf_interval + arf_active_or_kf) &&
2469 zero_motion_accumulator < 0.995) ||
2470 (
2471 // Don't break out with a very short interval.
2472 (i >= active_min_gf_interval + arf_active_or_kf) &&
2473 (!flash_detected) &&
2474 ((mv_ratio_accumulator > mv_ratio_accumulator_thresh) ||
2475 (abs_mv_in_out_accumulator > 3.0) ||
2476 (mv_in_out_accumulator < -2.0) ||
2477 ((boost_score - old_boost_score) < BOOST_BREAKOUT)))) {
2478 // If GF group interval is < 12, we force it to be 8. Otherwise,
2479 // if it is >= 12, we keep it as is.
2480 // NOTE: 'i' is 1 more than the GF group interval candidate that is being
2481 // checked.
2482 if (i == (8 + 1) || i >= (12 + 1)) {
2483 boost_score = old_boost_score;
2484 break;
2485 }
2486 }
2487 old_boost_score = boost_score;
2488 #endif // CONFIG_FIX_GF_LENGTH
2489 *this_frame = next_frame;
2490 }
2491 twopass->gf_zeromotion_pct = (int)(zero_motion_accumulator * 1000.0);
2492
2493 // Was the group length constrained by the requirement for a new KF?
2494 rc->constrained_gf_group = (i >= rc->frames_to_key) ? 1 : 0;
2495
2496 const int num_mbs = (cpi->oxcf.resize_mode != RESIZE_NONE) ? cpi->initial_mbs
2497 : cpi->common.MBs;
2498 assert(num_mbs > 0);
2499 if (i) avg_sr_coded_error /= i;
2500
2501 if (non_zero_stdev_count) avg_raw_err_stdev /= non_zero_stdev_count;
2502
2503 // Disable extra altrefs and backward refs for "still" gf group:
2504 // zero_motion_accumulator: minimum percentage of (0,0) motion;
2505 // avg_sr_coded_error: average of the SSE per pixel of each frame;
2506 // avg_raw_err_stdev: average of the standard deviation of (0,0)
2507 // motion error per block of each frame.
2508 const int disable_bwd_extarf =
2509 (zero_motion_accumulator > MIN_ZERO_MOTION &&
2510 avg_sr_coded_error / num_mbs < MAX_SR_CODED_ERROR &&
2511 avg_raw_err_stdev < MAX_RAW_ERR_VAR);
2512
2513 if (disable_bwd_extarf) cpi->extra_arf_allowed = 0;
2514
2515 #define REDUCE_GF_LENGTH_THRESH 4
2516 #define REDUCE_GF_LENGTH_TO_KEY_THRESH 9
2517 #define REDUCE_GF_LENGTH_BY 1
2518 int alt_offset = 0;
2519 #if REDUCE_LAST_GF_LENGTH
2520 // TODO(weitinglin): The length reduction stretagy is tweaking using AOM_Q
2521 // mode, and hurting the performance of VBR mode. We need to investigate how
2522 // to adjust GF length for other modes.
2523
2524 int allow_gf_length_reduction =
2525 cpi->oxcf.rc_mode == AOM_Q || cpi->extra_arf_allowed == 0;
2526
2527 // We are going to have an alt ref, but we don't have do adjustment for
2528 // lossless mode
2529 if (allow_alt_ref && allow_gf_length_reduction &&
2530 (i < cpi->oxcf.lag_in_frames) && (i >= rc->min_gf_interval) &&
2531 !is_lossless_requested(&cpi->oxcf)) {
2532 // adjust length of this gf group if one of the following condition met
2533 // 1: only one overlay frame left and this gf is too long
2534 // 2: next gf group is too short to have arf compared to the current gf
2535
2536 // maximum length of next gf group
2537 const int next_gf_len = rc->frames_to_key - i;
2538 const int single_overlay_left =
2539 next_gf_len == 0 && i > REDUCE_GF_LENGTH_THRESH;
2540 // the next gf is probably going to have a ARF but it will be shorter than
2541 // this gf
2542 const int unbalanced_gf =
2543 i > REDUCE_GF_LENGTH_TO_KEY_THRESH &&
2544 next_gf_len + 1 < REDUCE_GF_LENGTH_TO_KEY_THRESH &&
2545 next_gf_len + 1 >= rc->min_gf_interval;
2546
2547 if (single_overlay_left || unbalanced_gf) {
2548 // Note: Tried roll_back = DIVIDE_AND_ROUND(i, 8), but is does not work
2549 // better in the current setting
2550 const int roll_back = REDUCE_GF_LENGTH_BY;
2551 alt_offset = -roll_back;
2552 i -= roll_back;
2553 }
2554 }
2555 #endif
2556
2557 // Should we use the alternate reference frame.
2558 if (allow_alt_ref && (i < cpi->oxcf.lag_in_frames) &&
2559 (i >= rc->min_gf_interval)) {
2560 // Calculate the boost for alt ref.
2561 rc->gfu_boost =
2562 calc_arf_boost(cpi, alt_offset, (i - 1), (i - 1), &f_boost, &b_boost);
2563 rc->source_alt_ref_pending = 1;
2564
2565 // do not replace ARFs with overlay frames, and keep it as GOLDEN_REF
2566 cpi->preserve_arf_as_gld = 1;
2567 } else {
2568 rc->gfu_boost = AOMMAX((int)boost_score, MIN_ARF_GF_BOOST);
2569 rc->source_alt_ref_pending = 0;
2570 cpi->preserve_arf_as_gld = 0;
2571 }
2572
2573 // Set the interval until the next gf.
2574 // If forward keyframes are enabled, ensure the final gf group obeys the
2575 // MIN_FWD_KF_INTERVAL.
2576 if (cpi->oxcf.fwd_kf_enabled &&
2577 ((twopass->stats_in - i + rc->frames_to_key) < twopass->stats_in_end)) {
2578 if (i == rc->frames_to_key) {
2579 rc->baseline_gf_interval = i;
2580 // if the last gf group will be smaller than MIN_FWD_KF_INTERVAL
2581 } else if ((rc->frames_to_key - i <
2582 AOMMAX(MIN_FWD_KF_INTERVAL, rc->min_gf_interval)) &&
2583 (rc->frames_to_key != i)) {
2584 // if possible, merge the last two gf groups
2585 if (rc->frames_to_key <= MAX_PYRAMID_SIZE) {
2586 rc->baseline_gf_interval = rc->frames_to_key;
2587 // if merging the last two gf groups creates a group that is too long,
2588 // split them and force the last gf group to be the MIN_FWD_KF_INTERVAL
2589 } else {
2590 rc->baseline_gf_interval = rc->frames_to_key - MIN_FWD_KF_INTERVAL;
2591 }
2592 } else {
2593 rc->baseline_gf_interval =
2594 i - (is_key_frame || rc->source_alt_ref_pending);
2595 }
2596 } else {
2597 rc->baseline_gf_interval = i - (is_key_frame || rc->source_alt_ref_pending);
2598 }
2599
2600 #if REDUCE_LAST_ALT_BOOST
2601 #define LAST_ALR_BOOST_FACTOR 0.2f
2602 rc->arf_boost_factor = 1.0;
2603 if (rc->source_alt_ref_pending && !is_lossless_requested(&cpi->oxcf)) {
2604 // Reduce the boost of altref in the last gf group
2605 if (rc->frames_to_key - i == REDUCE_GF_LENGTH_BY ||
2606 rc->frames_to_key - i == 0) {
2607 rc->arf_boost_factor = LAST_ALR_BOOST_FACTOR;
2608 }
2609 }
2610 #endif
2611
2612 if (!cpi->extra_arf_allowed) {
2613 cpi->num_extra_arfs = 0;
2614 } else {
2615 #if USE_SYMM_MULTI_LAYER
2616 if (rc->baseline_gf_interval == 4 && rc->source_alt_ref_pending)
2617 cpi->num_extra_arfs = 1;
2618 else
2619 cpi->num_extra_arfs = get_number_of_extra_arfs(
2620 rc->baseline_gf_interval, rc->source_alt_ref_pending);
2621 #else
2622 // Compute how many extra alt_refs we can have
2623 cpi->num_extra_arfs = get_number_of_extra_arfs(rc->baseline_gf_interval,
2624 rc->source_alt_ref_pending);
2625 #endif // USE_SYMM_MULTI_LAYER
2626 }
2627
2628 #if !USE_SYMM_MULTI_LAYER
2629 // Currently at maximum two extra ARFs' are allowed
2630 assert(cpi->num_extra_arfs <= MAX_EXT_ARFS);
2631 #endif
2632
2633 rc->frames_till_gf_update_due = rc->baseline_gf_interval;
2634
2635 rc->bipred_group_interval = BFG_INTERVAL;
2636 // The minimum bi-predictive frame group interval is 2.
2637 if (rc->bipred_group_interval < 2) rc->bipred_group_interval = 0;
2638
2639 // Reset the file position.
2640 reset_fpf_position(twopass, start_pos);
2641
2642 // Calculate the bits to be allocated to the gf/arf group as a whole
2643 gf_group_bits = calculate_total_gf_group_bits(cpi, gf_group_err);
2644
2645 #if GROUP_ADAPTIVE_MAXQ
2646 // Calculate an estimate of the maxq needed for the group.
2647 // We are more agressive about correcting for sections
2648 // where there could be significant overshoot than for easier
2649 // sections where we do not wish to risk creating an overshoot
2650 // of the allocated bit budget.
2651 if ((cpi->oxcf.rc_mode != AOM_Q) && (rc->baseline_gf_interval > 1)) {
2652 const int vbr_group_bits_per_frame =
2653 (int)(gf_group_bits / rc->baseline_gf_interval);
2654 const double group_av_err = gf_group_raw_error / rc->baseline_gf_interval;
2655 const double group_av_skip_pct =
2656 gf_group_skip_pct / rc->baseline_gf_interval;
2657 const double group_av_inactive_zone =
2658 ((gf_group_inactive_zone_rows * 2) /
2659 (rc->baseline_gf_interval * (double)cm->mb_rows));
2660
2661 int tmp_q;
2662 // rc factor is a weight factor that corrects for local rate control drift.
2663 double rc_factor = 1.0;
2664 if (rc->rate_error_estimate > 0) {
2665 rc_factor = AOMMAX(RC_FACTOR_MIN,
2666 (double)(100 - rc->rate_error_estimate) / 100.0);
2667 } else {
2668 rc_factor = AOMMIN(RC_FACTOR_MAX,
2669 (double)(100 - rc->rate_error_estimate) / 100.0);
2670 }
2671 tmp_q = get_twopass_worst_quality(
2672 cpi, group_av_err, (group_av_skip_pct + group_av_inactive_zone),
2673 vbr_group_bits_per_frame, twopass->kfgroup_inter_fraction * rc_factor);
2674 twopass->active_worst_quality =
2675 AOMMAX(tmp_q, twopass->active_worst_quality >> 1);
2676 }
2677 #endif
2678
2679 // Calculate the extra bits to be used for boosted frame(s)
2680 gf_arf_bits = calculate_boost_bits(rc->baseline_gf_interval, rc->gfu_boost,
2681 gf_group_bits);
2682
2683 // Adjust KF group bits and error remaining.
2684 twopass->kf_group_error_left -= (int64_t)gf_group_err;
2685
2686 // If this is an arf update we want to remove the score for the overlay
2687 // frame at the end which will usually be very cheap to code.
2688 // The overlay frame has already, in effect, been coded so we want to spread
2689 // the remaining bits among the other frames.
2690 // For normal GFs remove the score for the GF itself unless this is
2691 // also a key frame in which case it has already been accounted for.
2692 if (rc->source_alt_ref_pending) {
2693 gf_group_error_left = gf_group_err - mod_frame_err;
2694 } else if (is_key_frame == 0) {
2695 gf_group_error_left = gf_group_err - gf_first_frame_err;
2696 } else {
2697 gf_group_error_left = gf_group_err;
2698 }
2699
2700 // Allocate bits to each of the frames in the GF group.
2701 allocate_gf_group_bits(cpi, gf_group_bits, gf_group_error_left, gf_arf_bits);
2702
2703 // Reset the file position.
2704 reset_fpf_position(twopass, start_pos);
2705
2706 // Calculate a section intra ratio used in setting max loop filter.
2707 if (cpi->common.frame_type != KEY_FRAME) {
2708 twopass->section_intra_rating = calculate_section_intra_ratio(
2709 start_pos, twopass->stats_in_end, rc->baseline_gf_interval);
2710 }
2711 }
2712
2713 // Threshold for use of the lagging second reference frame. High second ref
2714 // usage may point to a transient event like a flash or occlusion rather than
2715 // a real scene cut.
2716 #define SECOND_REF_USEAGE_THRESH 0.1
2717 // Minimum % intra coding observed in first pass (1.0 = 100%)
2718 #define MIN_INTRA_LEVEL 0.25
2719 // Minimum ratio between the % of intra coding and inter coding in the first
2720 // pass after discounting neutral blocks (discounting neutral blocks in this
2721 // way helps catch scene cuts in clips with very flat areas or letter box
2722 // format clips with image padding.
2723 #define INTRA_VS_INTER_THRESH 2.0
2724 // Hard threshold where the first pass chooses intra for almost all blocks.
2725 // In such a case even if the frame is not a scene cut coding a key frame
2726 // may be a good option.
2727 #define VERY_LOW_INTER_THRESH 0.05
2728 // Maximum threshold for the relative ratio of intra error score vs best
2729 // inter error score.
2730 #define KF_II_ERR_THRESHOLD 2.5
2731 // In real scene cuts there is almost always a sharp change in the intra
2732 // or inter error score.
2733 #define ERR_CHANGE_THRESHOLD 0.4
2734 // For real scene cuts we expect an improvment in the intra inter error
2735 // ratio in the next frame.
2736 #define II_IMPROVEMENT_THRESHOLD 3.5
2737 #define KF_II_MAX 128.0
2738
2739 static int test_candidate_kf(TWO_PASS *twopass,
2740 const FIRSTPASS_STATS *last_frame,
2741 const FIRSTPASS_STATS *this_frame,
2742 const FIRSTPASS_STATS *next_frame) {
2743 int is_viable_kf = 0;
2744 double pcnt_intra = 1.0 - this_frame->pcnt_inter;
2745 double modified_pcnt_inter =
2746 this_frame->pcnt_inter - this_frame->pcnt_neutral;
2747
2748 // Does the frame satisfy the primary criteria of a key frame?
2749 // See above for an explanation of the test criteria.
2750 // If so, then examine how well it predicts subsequent frames.
2751 if ((this_frame->pcnt_second_ref < SECOND_REF_USEAGE_THRESH) &&
2752 (next_frame->pcnt_second_ref < SECOND_REF_USEAGE_THRESH) &&
2753 ((this_frame->pcnt_inter < VERY_LOW_INTER_THRESH) ||
2754 ((pcnt_intra > MIN_INTRA_LEVEL) &&
2755 (pcnt_intra > (INTRA_VS_INTER_THRESH * modified_pcnt_inter)) &&
2756 ((this_frame->intra_error /
2757 DOUBLE_DIVIDE_CHECK(this_frame->coded_error)) <
2758 KF_II_ERR_THRESHOLD) &&
2759 ((fabs(last_frame->coded_error - this_frame->coded_error) /
2760 DOUBLE_DIVIDE_CHECK(this_frame->coded_error) >
2761 ERR_CHANGE_THRESHOLD) ||
2762 (fabs(last_frame->intra_error - this_frame->intra_error) /
2763 DOUBLE_DIVIDE_CHECK(this_frame->intra_error) >
2764 ERR_CHANGE_THRESHOLD) ||
2765 ((next_frame->intra_error /
2766 DOUBLE_DIVIDE_CHECK(next_frame->coded_error)) >
2767 II_IMPROVEMENT_THRESHOLD))))) {
2768 int i;
2769 const FIRSTPASS_STATS *start_pos = twopass->stats_in;
2770 FIRSTPASS_STATS local_next_frame = *next_frame;
2771 double boost_score = 0.0;
2772 double old_boost_score = 0.0;
2773 double decay_accumulator = 1.0;
2774
2775 // Examine how well the key frame predicts subsequent frames.
2776 for (i = 0; i < 16; ++i) {
2777 double next_iiratio = (BOOST_FACTOR * local_next_frame.intra_error /
2778 DOUBLE_DIVIDE_CHECK(local_next_frame.coded_error));
2779
2780 if (next_iiratio > KF_II_MAX) next_iiratio = KF_II_MAX;
2781
2782 // Cumulative effect of decay in prediction quality.
2783 if (local_next_frame.pcnt_inter > 0.85)
2784 decay_accumulator *= local_next_frame.pcnt_inter;
2785 else
2786 decay_accumulator *= (0.85 + local_next_frame.pcnt_inter) / 2.0;
2787
2788 // Keep a running total.
2789 boost_score += (decay_accumulator * next_iiratio);
2790
2791 // Test various breakout clauses.
2792 if ((local_next_frame.pcnt_inter < 0.05) || (next_iiratio < 1.5) ||
2793 (((local_next_frame.pcnt_inter - local_next_frame.pcnt_neutral) <
2794 0.20) &&
2795 (next_iiratio < 3.0)) ||
2796 ((boost_score - old_boost_score) < 3.0) ||
2797 (local_next_frame.intra_error < 200)) {
2798 break;
2799 }
2800
2801 old_boost_score = boost_score;
2802
2803 // Get the next frame details
2804 if (EOF == input_stats(twopass, &local_next_frame)) break;
2805 }
2806
2807 // If there is tolerable prediction for at least the next 3 frames then
2808 // break out else discard this potential key frame and move on
2809 if (boost_score > 30.0 && (i > 3)) {
2810 is_viable_kf = 1;
2811 } else {
2812 // Reset the file position
2813 reset_fpf_position(twopass, start_pos);
2814
2815 is_viable_kf = 0;
2816 }
2817 }
2818
2819 return is_viable_kf;
2820 }
2821
2822 #define FRAMES_TO_CHECK_DECAY 8
2823
2824 static void find_next_key_frame(AV1_COMP *cpi, FIRSTPASS_STATS *this_frame) {
2825 int i, j;
2826 RATE_CONTROL *const rc = &cpi->rc;
2827 TWO_PASS *const twopass = &cpi->twopass;
2828 GF_GROUP *const gf_group = &twopass->gf_group;
2829 const AV1EncoderConfig *const oxcf = &cpi->oxcf;
2830 const FIRSTPASS_STATS first_frame = *this_frame;
2831 const FIRSTPASS_STATS *const start_position = twopass->stats_in;
2832 FIRSTPASS_STATS next_frame;
2833 FIRSTPASS_STATS last_frame;
2834 int kf_bits = 0;
2835 int loop_decay_counter = 0;
2836 double decay_accumulator = 1.0;
2837 double av_decay_accumulator = 0.0;
2838 double zero_motion_accumulator = 1.0;
2839 double boost_score = 0.0;
2840 double kf_mod_err = 0.0;
2841 double kf_group_err = 0.0;
2842 double recent_loop_decay[FRAMES_TO_CHECK_DECAY];
2843
2844 av1_zero(next_frame);
2845
2846 cpi->common.frame_type = KEY_FRAME;
2847
2848 // Reset the GF group data structures.
2849 av1_zero(*gf_group);
2850
2851 // Is this a forced key frame by interval.
2852 rc->this_key_frame_forced = rc->next_key_frame_forced;
2853
2854 // Clear the alt ref active flag and last group multi arf flags as they
2855 // can never be set for a key frame.
2856 rc->source_alt_ref_active = 0;
2857
2858 // KF is always a GF so clear frames till next gf counter.
2859 rc->frames_till_gf_update_due = 0;
2860
2861 rc->frames_to_key = 1;
2862
2863 twopass->kf_group_bits = 0; // Total bits available to kf group
2864 twopass->kf_group_error_left = 0; // Group modified error score.
2865
2866 kf_mod_err = calculate_modified_err(cpi, twopass, oxcf, this_frame);
2867
2868 // Initialize the decay rates for the recent frames to check
2869 for (j = 0; j < FRAMES_TO_CHECK_DECAY; ++j) recent_loop_decay[j] = 1.0;
2870
2871 // Find the next keyframe.
2872 i = 0;
2873 while (twopass->stats_in < twopass->stats_in_end &&
2874 rc->frames_to_key < cpi->oxcf.key_freq) {
2875 // Accumulate kf group error.
2876 kf_group_err += calculate_modified_err(cpi, twopass, oxcf, this_frame);
2877
2878 // Load the next frame's stats.
2879 last_frame = *this_frame;
2880 input_stats(twopass, this_frame);
2881
2882 // Provided that we are not at the end of the file...
2883 if (cpi->oxcf.auto_key && twopass->stats_in < twopass->stats_in_end) {
2884 double loop_decay_rate;
2885
2886 // Check for a scene cut.
2887 if (test_candidate_kf(twopass, &last_frame, this_frame,
2888 twopass->stats_in))
2889 break;
2890
2891 // How fast is the prediction quality decaying?
2892 loop_decay_rate = get_prediction_decay_rate(cpi, twopass->stats_in);
2893
2894 // We want to know something about the recent past... rather than
2895 // as used elsewhere where we are concerned with decay in prediction
2896 // quality since the last GF or KF.
2897 recent_loop_decay[i % FRAMES_TO_CHECK_DECAY] = loop_decay_rate;
2898 decay_accumulator = 1.0;
2899 for (j = 0; j < FRAMES_TO_CHECK_DECAY; ++j)
2900 decay_accumulator *= recent_loop_decay[j];
2901
2902 // Special check for transition or high motion followed by a
2903 // static scene.
2904 if (detect_transition_to_still(cpi, i, cpi->oxcf.key_freq - i,
2905 loop_decay_rate, decay_accumulator))
2906 break;
2907
2908 // Step on to the next frame.
2909 ++rc->frames_to_key;
2910
2911 // If we don't have a real key frame within the next two
2912 // key_freq intervals then break out of the loop.
2913 if (rc->frames_to_key >= 2 * cpi->oxcf.key_freq) break;
2914 } else {
2915 ++rc->frames_to_key;
2916 }
2917 ++i;
2918 }
2919
2920 // If there is a max kf interval set by the user we must obey it.
2921 // We already breakout of the loop above at 2x max.
2922 // This code centers the extra kf if the actual natural interval
2923 // is between 1x and 2x.
2924 if (cpi->oxcf.auto_key && rc->frames_to_key > cpi->oxcf.key_freq) {
2925 FIRSTPASS_STATS tmp_frame = first_frame;
2926
2927 rc->frames_to_key /= 2;
2928
2929 // Reset to the start of the group.
2930 reset_fpf_position(twopass, start_position);
2931
2932 kf_group_err = 0.0;
2933
2934 // Rescan to get the correct error data for the forced kf group.
2935 for (i = 0; i < rc->frames_to_key; ++i) {
2936 kf_group_err += calculate_modified_err(cpi, twopass, oxcf, &tmp_frame);
2937 input_stats(twopass, &tmp_frame);
2938 }
2939 rc->next_key_frame_forced = 1;
2940 } else if (twopass->stats_in == twopass->stats_in_end ||
2941 rc->frames_to_key >= cpi->oxcf.key_freq) {
2942 rc->next_key_frame_forced = 1;
2943 } else {
2944 rc->next_key_frame_forced = 0;
2945 }
2946
2947 // Special case for the last key frame of the file.
2948 if (twopass->stats_in >= twopass->stats_in_end) {
2949 // Accumulate kf group error.
2950 kf_group_err += calculate_modified_err(cpi, twopass, oxcf, this_frame);
2951 }
2952
2953 // Calculate the number of bits that should be assigned to the kf group.
2954 if (twopass->bits_left > 0 && twopass->modified_error_left > 0.0) {
2955 // Maximum number of bits for a single normal frame (not key frame).
2956 const int max_bits = frame_max_bits(rc, &cpi->oxcf);
2957
2958 // Maximum number of bits allocated to the key frame group.
2959 int64_t max_grp_bits;
2960
2961 // Default allocation based on bits left and relative
2962 // complexity of the section.
2963 twopass->kf_group_bits = (int64_t)(
2964 twopass->bits_left * (kf_group_err / twopass->modified_error_left));
2965
2966 // Clip based on maximum per frame rate defined by the user.
2967 max_grp_bits = (int64_t)max_bits * (int64_t)rc->frames_to_key;
2968 if (twopass->kf_group_bits > max_grp_bits)
2969 twopass->kf_group_bits = max_grp_bits;
2970 } else {
2971 twopass->kf_group_bits = 0;
2972 }
2973 twopass->kf_group_bits = AOMMAX(0, twopass->kf_group_bits);
2974
2975 // Reset the first pass file position.
2976 reset_fpf_position(twopass, start_position);
2977
2978 // Scan through the kf group collating various stats used to determine
2979 // how many bits to spend on it.
2980 decay_accumulator = 1.0;
2981 boost_score = 0.0;
2982 const double kf_max_boost =
2983 cpi->oxcf.rc_mode == AOM_Q
2984 ? AOMMIN(AOMMAX(rc->frames_to_key * 2.0, KF_MIN_FRAME_BOOST),
2985 KF_MAX_FRAME_BOOST)
2986 : KF_MAX_FRAME_BOOST;
2987 for (i = 0; i < (rc->frames_to_key - 1); ++i) {
2988 if (EOF == input_stats(twopass, &next_frame)) break;
2989
2990 // Monitor for static sections.
2991 zero_motion_accumulator = AOMMIN(zero_motion_accumulator,
2992 get_zero_motion_factor(cpi, &next_frame));
2993
2994 // Not all frames in the group are necessarily used in calculating boost.
2995 if ((i <= rc->max_gf_interval) ||
2996 ((i <= (rc->max_gf_interval * 4)) && (decay_accumulator > 0.5))) {
2997 const double frame_boost =
2998 calc_frame_boost(cpi, this_frame, 0, kf_max_boost);
2999
3000 // How fast is prediction quality decaying.
3001 if (!detect_flash(twopass, 0)) {
3002 const double loop_decay_rate =
3003 get_prediction_decay_rate(cpi, &next_frame);
3004 decay_accumulator *= loop_decay_rate;
3005 decay_accumulator = AOMMAX(decay_accumulator, MIN_DECAY_FACTOR);
3006 av_decay_accumulator += decay_accumulator;
3007 ++loop_decay_counter;
3008 }
3009 boost_score += (decay_accumulator * frame_boost);
3010 }
3011 }
3012 if (loop_decay_counter > 0)
3013 av_decay_accumulator /= (double)loop_decay_counter;
3014
3015 reset_fpf_position(twopass, start_position);
3016
3017 // Store the zero motion percentage
3018 twopass->kf_zeromotion_pct = (int)(zero_motion_accumulator * 100.0);
3019
3020 // Calculate a section intra ratio used in setting max loop filter.
3021 twopass->section_intra_rating = calculate_section_intra_ratio(
3022 start_position, twopass->stats_in_end, rc->frames_to_key);
3023
3024 // Apply various clamps for min and max boost
3025 rc->kf_boost = (int)(av_decay_accumulator * boost_score);
3026 rc->kf_boost = AOMMAX(rc->kf_boost, (rc->frames_to_key * 3));
3027 rc->kf_boost = AOMMAX(rc->kf_boost, MIN_KF_BOOST);
3028
3029 // Work out how many bits to allocate for the key frame itself.
3030 kf_bits = calculate_boost_bits((rc->frames_to_key - 1), rc->kf_boost,
3031 twopass->kf_group_bits);
3032 // printf("kf boost = %d kf_bits = %d kf_zeromotion_pct = %d\n", rc->kf_boost,
3033 // kf_bits, twopass->kf_zeromotion_pct);
3034
3035 // Work out the fraction of the kf group bits reserved for the inter frames
3036 // within the group after discounting the bits for the kf itself.
3037 if (twopass->kf_group_bits) {
3038 twopass->kfgroup_inter_fraction =
3039 (double)(twopass->kf_group_bits - kf_bits) /
3040 (double)twopass->kf_group_bits;
3041 } else {
3042 twopass->kfgroup_inter_fraction = 1.0;
3043 }
3044
3045 twopass->kf_group_bits -= kf_bits;
3046
3047 // Save the bits to spend on the key frame.
3048 gf_group->bit_allocation[0] = kf_bits;
3049 gf_group->update_type[0] = KF_UPDATE;
3050 gf_group->rf_level[0] = KF_STD;
3051
3052 // Note the total error score of the kf group minus the key frame itself.
3053 twopass->kf_group_error_left = (int)(kf_group_err - kf_mod_err);
3054
3055 // Adjust the count of total modified error left.
3056 // The count of bits left is adjusted elsewhere based on real coded frame
3057 // sizes.
3058 twopass->modified_error_left -= kf_group_err;
3059 }
3060
3061 // Define the reference buffers that will be updated post encode.
3062 static void configure_buffer_updates(AV1_COMP *cpi) {
3063 TWO_PASS *const twopass = &cpi->twopass;
3064
3065 // NOTE(weitinglin): Should we define another function to take care of
3066 // cpi->rc.is_$Source_Type to make this function as it is in the comment?
3067
3068 cpi->rc.is_src_frame_alt_ref = 0;
3069 cpi->rc.is_bwd_ref_frame = 0;
3070 cpi->rc.is_last_bipred_frame = 0;
3071 cpi->rc.is_bipred_frame = 0;
3072 cpi->rc.is_src_frame_ext_arf = 0;
3073
3074 switch (twopass->gf_group.update_type[twopass->gf_group.index]) {
3075 case KF_UPDATE:
3076 cpi->refresh_last_frame = 1;
3077 cpi->refresh_golden_frame = 1;
3078 cpi->refresh_bwd_ref_frame = 1;
3079 cpi->refresh_alt2_ref_frame = 1;
3080 cpi->refresh_alt_ref_frame = 1;
3081 break;
3082
3083 case LF_UPDATE:
3084 cpi->refresh_last_frame = 1;
3085 cpi->refresh_golden_frame = 0;
3086 cpi->refresh_bwd_ref_frame = 0;
3087 cpi->refresh_alt2_ref_frame = 0;
3088 cpi->refresh_alt_ref_frame = 0;
3089 break;
3090
3091 case GF_UPDATE:
3092 // TODO(zoeliu): To further investigate whether 'refresh_last_frame' is
3093 // needed.
3094 cpi->refresh_last_frame = 1;
3095 cpi->refresh_golden_frame = 1;
3096 cpi->refresh_bwd_ref_frame = 0;
3097 cpi->refresh_alt2_ref_frame = 0;
3098 cpi->refresh_alt_ref_frame = 0;
3099 break;
3100
3101 case OVERLAY_UPDATE:
3102 cpi->refresh_last_frame = 0;
3103 cpi->refresh_golden_frame = 1;
3104 cpi->refresh_bwd_ref_frame = 0;
3105 cpi->refresh_alt2_ref_frame = 0;
3106 cpi->refresh_alt_ref_frame = 0;
3107
3108 cpi->rc.is_src_frame_alt_ref = 1;
3109 break;
3110
3111 case ARF_UPDATE:
3112 cpi->refresh_last_frame = 0;
3113 cpi->refresh_golden_frame = 0;
3114 // NOTE: BWDREF does not get updated along with ALTREF_FRAME.
3115 cpi->refresh_bwd_ref_frame = 0;
3116 cpi->refresh_alt2_ref_frame = 0;
3117 cpi->refresh_alt_ref_frame = 1;
3118 break;
3119
3120 case BRF_UPDATE:
3121 cpi->refresh_last_frame = 0;
3122 cpi->refresh_golden_frame = 0;
3123 cpi->refresh_bwd_ref_frame = 1;
3124 cpi->refresh_alt2_ref_frame = 0;
3125 cpi->refresh_alt_ref_frame = 0;
3126
3127 cpi->rc.is_bwd_ref_frame = 1;
3128 break;
3129
3130 case LAST_BIPRED_UPDATE:
3131 cpi->refresh_last_frame = 1;
3132 cpi->refresh_golden_frame = 0;
3133 cpi->refresh_bwd_ref_frame = 0;
3134 cpi->refresh_alt2_ref_frame = 0;
3135 cpi->refresh_alt_ref_frame = 0;
3136
3137 cpi->rc.is_last_bipred_frame = 1;
3138 break;
3139
3140 case BIPRED_UPDATE:
3141 cpi->refresh_last_frame = 1;
3142 cpi->refresh_golden_frame = 0;
3143 cpi->refresh_bwd_ref_frame = 0;
3144 cpi->refresh_alt2_ref_frame = 0;
3145 cpi->refresh_alt_ref_frame = 0;
3146
3147 cpi->rc.is_bipred_frame = 1;
3148 break;
3149
3150 case INTNL_OVERLAY_UPDATE:
3151 cpi->refresh_last_frame = 1;
3152 cpi->refresh_golden_frame = 0;
3153 cpi->refresh_bwd_ref_frame = 0;
3154 cpi->refresh_alt2_ref_frame = 0;
3155 cpi->refresh_alt_ref_frame = 0;
3156
3157 cpi->rc.is_src_frame_alt_ref = 1;
3158 cpi->rc.is_src_frame_ext_arf = 1;
3159 break;
3160
3161 case INTNL_ARF_UPDATE:
3162 cpi->refresh_last_frame = 0;
3163 cpi->refresh_golden_frame = 0;
3164 #if USE_SYMM_MULTI_LAYER
3165 if (cpi->new_bwdref_update_rule == 1) {
3166 cpi->refresh_bwd_ref_frame = 1;
3167 cpi->refresh_alt2_ref_frame = 0;
3168 } else {
3169 #endif
3170 cpi->refresh_bwd_ref_frame = 0;
3171 cpi->refresh_alt2_ref_frame = 1;
3172 #if USE_SYMM_MULTI_LAYER
3173 }
3174 #endif
3175 cpi->refresh_alt_ref_frame = 0;
3176 break;
3177
3178 default: assert(0); break;
3179 }
3180 }
3181
3182 void av1_configure_buffer_updates_firstpass(AV1_COMP *cpi,
3183 FRAME_UPDATE_TYPE update_type) {
3184 RATE_CONTROL *rc = &cpi->rc;
3185
3186 cpi->refresh_last_frame = 1;
3187 cpi->refresh_golden_frame = 0;
3188 cpi->refresh_bwd_ref_frame = 0;
3189 cpi->refresh_alt2_ref_frame = 0;
3190 cpi->refresh_alt_ref_frame = 0;
3191
3192 rc->is_bwd_ref_frame = 0;
3193
3194 switch (update_type) {
3195 case ARF_UPDATE:
3196 cpi->refresh_alt_ref_frame = 1;
3197 cpi->refresh_last_frame = 0;
3198 cpi->refresh_golden_frame = 0;
3199 cpi->refresh_bwd_ref_frame = 0;
3200 cpi->refresh_alt2_ref_frame = 0;
3201
3202 rc->is_src_frame_alt_ref = 0;
3203 break;
3204 case INTNL_ARF_UPDATE:
3205 cpi->refresh_alt2_ref_frame = 1;
3206 cpi->refresh_last_frame = 0;
3207 cpi->refresh_golden_frame = 0;
3208 cpi->refresh_bwd_ref_frame = 0;
3209 cpi->refresh_alt_ref_frame = 0;
3210 rc->is_src_frame_alt_ref = 0;
3211 rc->is_src_frame_ext_arf = 0;
3212
3213 break;
3214 case BIPRED_UPDATE:
3215 cpi->refresh_bwd_ref_frame = 1;
3216 cpi->refresh_last_frame = 0;
3217 cpi->refresh_golden_frame = 0;
3218 cpi->refresh_alt2_ref_frame = 0;
3219 cpi->refresh_alt_ref_frame = 0;
3220
3221 rc->is_bwd_ref_frame = 1;
3222 break;
3223 default: break;
3224 }
3225 }
3226
3227 static int is_skippable_frame(const AV1_COMP *cpi) {
3228 // If the current frame does not have non-zero motion vector detected in the
3229 // first pass, and so do its previous and forward frames, then this frame
3230 // can be skipped for partition check, and the partition size is assigned
3231 // according to the variance
3232 const TWO_PASS *const twopass = &cpi->twopass;
3233
3234 return (!frame_is_intra_only(&cpi->common) &&
3235 twopass->stats_in - 2 > twopass->stats_in_start &&
3236 twopass->stats_in < twopass->stats_in_end &&
3237 (twopass->stats_in - 1)->pcnt_inter -
3238 (twopass->stats_in - 1)->pcnt_motion ==
3239 1 &&
3240 (twopass->stats_in - 2)->pcnt_inter -
3241 (twopass->stats_in - 2)->pcnt_motion ==
3242 1 &&
3243 twopass->stats_in->pcnt_inter - twopass->stats_in->pcnt_motion == 1);
3244 }
3245
3246 void av1_rc_get_second_pass_params(AV1_COMP *cpi) {
3247 AV1_COMMON *const cm = &cpi->common;
3248 RATE_CONTROL *const rc = &cpi->rc;
3249 TWO_PASS *const twopass = &cpi->twopass;
3250 GF_GROUP *const gf_group = &twopass->gf_group;
3251 int frames_left;
3252 FIRSTPASS_STATS this_frame;
3253
3254 int target_rate;
3255
3256 frames_left = (int)(twopass->total_stats.count - cm->current_video_frame);
3257
3258 if (!twopass->stats_in) return;
3259
3260 // If this is an arf frame then we dont want to read the stats file or
3261 // advance the input pointer as we already have what we need.
3262 if (gf_group->update_type[gf_group->index] == ARF_UPDATE ||
3263 gf_group->update_type[gf_group->index] == INTNL_ARF_UPDATE) {
3264 configure_buffer_updates(cpi);
3265 target_rate = gf_group->bit_allocation[gf_group->index];
3266 target_rate = av1_rc_clamp_pframe_target_size(cpi, target_rate);
3267 rc->base_frame_target = target_rate;
3268
3269 if (cpi->no_show_kf) {
3270 assert(gf_group->update_type[gf_group->index] == ARF_UPDATE);
3271 cm->frame_type = KEY_FRAME;
3272 } else {
3273 cm->frame_type = INTER_FRAME;
3274 }
3275
3276 // Do the firstpass stats indicate that this frame is skippable for the
3277 // partition search?
3278 if (cpi->sf.allow_partition_search_skip && cpi->oxcf.pass == 2) {
3279 cpi->partition_search_skippable_frame = is_skippable_frame(cpi);
3280 }
3281
3282 return;
3283 }
3284
3285 aom_clear_system_state();
3286
3287 if (cpi->oxcf.rc_mode == AOM_Q) {
3288 twopass->active_worst_quality = cpi->oxcf.cq_level;
3289 } else if (cm->current_video_frame == 0) {
3290 // Special case code for first frame.
3291 const int section_target_bandwidth =
3292 (int)(twopass->bits_left / frames_left);
3293 const double section_length = twopass->total_left_stats.count;
3294 const double section_error =
3295 twopass->total_left_stats.coded_error / section_length;
3296 const double section_intra_skip =
3297 twopass->total_left_stats.intra_skip_pct / section_length;
3298 const double section_inactive_zone =
3299 (twopass->total_left_stats.inactive_zone_rows * 2) /
3300 ((double)cm->mb_rows * section_length);
3301 const int tmp_q = get_twopass_worst_quality(
3302 cpi, section_error, section_intra_skip + section_inactive_zone,
3303 section_target_bandwidth, DEFAULT_GRP_WEIGHT);
3304
3305 twopass->active_worst_quality = tmp_q;
3306 twopass->baseline_active_worst_quality = tmp_q;
3307 rc->ni_av_qi = tmp_q;
3308 rc->last_q[INTER_FRAME] = tmp_q;
3309 rc->avg_q = av1_convert_qindex_to_q(tmp_q, cm->seq_params.bit_depth);
3310 rc->avg_frame_qindex[INTER_FRAME] = tmp_q;
3311 rc->last_q[KEY_FRAME] = (tmp_q + cpi->oxcf.best_allowed_q) / 2;
3312 rc->avg_frame_qindex[KEY_FRAME] = rc->last_q[KEY_FRAME];
3313 }
3314
3315 av1_zero(this_frame);
3316 if (EOF == input_stats(twopass, &this_frame)) return;
3317
3318 // Set the frame content type flag.
3319 if (this_frame.intra_skip_pct >= FC_ANIMATION_THRESH)
3320 twopass->fr_content_type = FC_GRAPHICS_ANIMATION;
3321 else
3322 twopass->fr_content_type = FC_NORMAL;
3323
3324 // Keyframe and section processing.
3325 if (rc->frames_to_key == 0 || (cpi->frame_flags & FRAMEFLAGS_KEY)) {
3326 FIRSTPASS_STATS this_frame_copy;
3327 this_frame_copy = this_frame;
3328 // Define next KF group and assign bits to it.
3329 find_next_key_frame(cpi, &this_frame);
3330 this_frame = this_frame_copy;
3331 } else {
3332 cm->frame_type = INTER_FRAME;
3333 }
3334
3335 // Define a new GF/ARF group. (Should always enter here for key frames).
3336 if (rc->frames_till_gf_update_due == 0) {
3337 define_gf_group(cpi, &this_frame);
3338
3339 rc->frames_till_gf_update_due = rc->baseline_gf_interval;
3340
3341 #if ARF_STATS_OUTPUT
3342 {
3343 FILE *fpfile;
3344 fpfile = fopen("arf.stt", "a");
3345 ++arf_count;
3346 fprintf(fpfile, "%10d %10d %10d %10d %10d\n", cm->current_video_frame,
3347 rc->frames_till_gf_update_due, rc->kf_boost, arf_count,
3348 rc->gfu_boost);
3349
3350 fclose(fpfile);
3351 }
3352 #endif
3353 }
3354
3355 configure_buffer_updates(cpi);
3356
3357 // Do the firstpass stats indicate that this frame is skippable for the
3358 // partition search?
3359 if (cpi->sf.allow_partition_search_skip && cpi->oxcf.pass == 2) {
3360 cpi->partition_search_skippable_frame = is_skippable_frame(cpi);
3361 }
3362
3363 target_rate = gf_group->bit_allocation[gf_group->index];
3364
3365 if (cpi->common.frame_type == KEY_FRAME)
3366 target_rate = av1_rc_clamp_iframe_target_size(cpi, target_rate);
3367 else
3368 target_rate = av1_rc_clamp_pframe_target_size(cpi, target_rate);
3369
3370 rc->base_frame_target = target_rate;
3371
3372 {
3373 const int num_mbs = (cpi->oxcf.resize_mode != RESIZE_NONE)
3374 ? cpi->initial_mbs
3375 : cpi->common.MBs;
3376 // The multiplication by 256 reverses a scaling factor of (>> 8)
3377 // applied when combining MB error values for the frame.
3378 twopass->mb_av_energy = log((this_frame.intra_error / num_mbs) + 1.0);
3379 twopass->frame_avg_haar_energy =
3380 log((this_frame.frame_avg_wavelet_energy / num_mbs) + 1.0);
3381 }
3382
3383 // Update the total stats remaining structure.
3384 subtract_stats(&twopass->total_left_stats, &this_frame);
3385 }
3386
3387 #define MINQ_ADJ_LIMIT 48
3388 #define MINQ_ADJ_LIMIT_CQ 20
3389 #define HIGH_UNDERSHOOT_RATIO 2
3390 void av1_twopass_postencode_update(AV1_COMP *cpi) {
3391 TWO_PASS *const twopass = &cpi->twopass;
3392 RATE_CONTROL *const rc = &cpi->rc;
3393 const int bits_used = rc->base_frame_target;
3394
3395 // VBR correction is done through rc->vbr_bits_off_target. Based on the
3396 // sign of this value, a limited % adjustment is made to the target rate
3397 // of subsequent frames, to try and push it back towards 0. This method
3398 // is designed to prevent extreme behaviour at the end of a clip
3399 // or group of frames.
3400 rc->vbr_bits_off_target += rc->base_frame_target - rc->projected_frame_size;
3401 twopass->bits_left = AOMMAX(twopass->bits_left - bits_used, 0);
3402
3403 // Calculate the pct rc error.
3404 if (rc->total_actual_bits) {
3405 rc->rate_error_estimate =
3406 (int)((rc->vbr_bits_off_target * 100) / rc->total_actual_bits);
3407 rc->rate_error_estimate = clamp(rc->rate_error_estimate, -100, 100);
3408 } else {
3409 rc->rate_error_estimate = 0;
3410 }
3411
3412 if (cpi->common.frame_type != KEY_FRAME) {
3413 twopass->kf_group_bits -= bits_used;
3414 twopass->last_kfgroup_zeromotion_pct = twopass->kf_zeromotion_pct;
3415 }
3416 twopass->kf_group_bits = AOMMAX(twopass->kf_group_bits, 0);
3417
3418 // If the rate control is drifting consider adjustment to min or maxq.
3419 if ((cpi->oxcf.rc_mode != AOM_Q) &&
3420 (cpi->twopass.gf_zeromotion_pct < VLOW_MOTION_THRESHOLD) &&
3421 !cpi->rc.is_src_frame_alt_ref) {
3422 const int maxq_adj_limit =
3423 rc->worst_quality - twopass->active_worst_quality;
3424 const int minq_adj_limit =
3425 (cpi->oxcf.rc_mode == AOM_CQ ? MINQ_ADJ_LIMIT_CQ : MINQ_ADJ_LIMIT);
3426
3427 // Undershoot.
3428 if (rc->rate_error_estimate > cpi->oxcf.under_shoot_pct) {
3429 --twopass->extend_maxq;
3430 if (rc->rolling_target_bits >= rc->rolling_actual_bits)
3431 ++twopass->extend_minq;
3432 // Overshoot.
3433 } else if (rc->rate_error_estimate < -cpi->oxcf.over_shoot_pct) {
3434 --twopass->extend_minq;
3435 if (rc->rolling_target_bits < rc->rolling_actual_bits)
3436 ++twopass->extend_maxq;
3437 } else {
3438 // Adjustment for extreme local overshoot.
3439 if (rc->projected_frame_size > (2 * rc->base_frame_target) &&
3440 rc->projected_frame_size > (2 * rc->avg_frame_bandwidth))
3441 ++twopass->extend_maxq;
3442
3443 // Unwind undershoot or overshoot adjustment.
3444 if (rc->rolling_target_bits < rc->rolling_actual_bits)
3445 --twopass->extend_minq;
3446 else if (rc->rolling_target_bits > rc->rolling_actual_bits)
3447 --twopass->extend_maxq;
3448 }
3449
3450 twopass->extend_minq = clamp(twopass->extend_minq, 0, minq_adj_limit);
3451 twopass->extend_maxq = clamp(twopass->extend_maxq, 0, maxq_adj_limit);
3452
3453 // If there is a big and undexpected undershoot then feed the extra
3454 // bits back in quickly. One situation where this may happen is if a
3455 // frame is unexpectedly almost perfectly predicted by the ARF or GF
3456 // but not very well predcited by the previous frame.
3457 if (!frame_is_kf_gf_arf(cpi) && !cpi->rc.is_src_frame_alt_ref) {
3458 int fast_extra_thresh = rc->base_frame_target / HIGH_UNDERSHOOT_RATIO;
3459 if (rc->projected_frame_size < fast_extra_thresh) {
3460 rc->vbr_bits_off_target_fast +=
3461 fast_extra_thresh - rc->projected_frame_size;
3462 rc->vbr_bits_off_target_fast =
3463 AOMMIN(rc->vbr_bits_off_target_fast, (4 * rc->avg_frame_bandwidth));
3464
3465 // Fast adaptation of minQ if necessary to use up the extra bits.
3466 if (rc->avg_frame_bandwidth) {
3467 twopass->extend_minq_fast =
3468 (int)(rc->vbr_bits_off_target_fast * 8 / rc->avg_frame_bandwidth);
3469 }
3470 twopass->extend_minq_fast = AOMMIN(
3471 twopass->extend_minq_fast, minq_adj_limit - twopass->extend_minq);
3472 } else if (rc->vbr_bits_off_target_fast) {
3473 twopass->extend_minq_fast = AOMMIN(
3474 twopass->extend_minq_fast, minq_adj_limit - twopass->extend_minq);
3475 } else {
3476 twopass->extend_minq_fast = 0;
3477 }
3478 }
3479 }
3480 }
3481