AOMedia AV1 Codec: av1/encoder/ratectrl.h Source File

| AOMedia AV1 Codec

ratectrl.h
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#ifndef AOM_AV1_ENCODER_RATECTRL_H_
13#define AOM_AV1_ENCODER_RATECTRL_H_
14
15#include "aom/aom_codec.h"
16#include "aom/aom_integer.h"
17
18#include "aom_ports/mem.h"
19
20#include "av1/common/av1_common_int.h"
21#include "av1/common/blockd.h"
22
23#ifdef __cplusplus
24extern "C" {
25#endif
26
28
29// Bits Per MB at different Q (Multiplied by 512)
30#define BPER_MB_NORMBITS 9
31
32// Use this macro to turn on/off use of alt-refs in one-pass mode.
33#define USE_ALTREF_FOR_ONE_PASS 1
34
35// Threshold used to define if a KF group is static (e.g. a slide show).
36// Essentially, this means that no frame in the group has more than 1% of MBs
37// that are not marked as coded with 0,0 motion in the first pass.
38#define STATIC_KF_GROUP_THRESH 99
39#define STATIC_KF_GROUP_FLOAT_THRESH 0.99
40
41// The maximum duration of a GF group that is static (e.g. a slide show).
42#define MAX_STATIC_GF_GROUP_LENGTH 250
43
44#define MIN_GF_INTERVAL 4
45#define MAX_GF_INTERVAL 32
46#define FIXED_GF_INTERVAL 16
47#define MAX_GF_LENGTH_LAP 16
48
49#define FIXED_GF_INTERVAL_RT 80
50#define MAX_GF_INTERVAL_RT 160
51
52#define MAX_NUM_GF_INTERVALS 15
53
54#define MAX_ARF_LAYERS 6
55// #define STRICT_RC
56
57#define DEFAULT_KF_BOOST_RT 2300
58#define DEFAULT_GF_BOOST_RT 2000
59
60// A passive rate control strategy for screen content type in real-time mode.
61// When it is turned on, the compression performance is improved by
62// 7.8% (overall_psnr), 5.0% (VMAF) on average. Some clips see gains
63// over 20% on metric.
64// The downside is that it does not guarantee frame size.
65// Since RT mode has a tight restriction on buffer overflow control, we
66// turn it off by default.
67#define RT_PASSIVE_STRATEGY 0
68#define MAX_Q_HISTORY 1000
69
70typedef struct {
71 int resize_width;
72 int resize_height;
73 uint8_t superres_denom;
74} size_params_type;
75
76enum {
77 INTER_NORMAL,
78 GF_ARF_LOW,
79 GF_ARF_STD,
80 KF_STD,
81 RATE_FACTOR_LEVELS
82} UENUM1BYTE(RATE_FACTOR_LEVEL);
83
84enum {
85 KF_UPDATE,
86 LF_UPDATE,
87 GF_UPDATE,
88 ARF_UPDATE,
89 OVERLAY_UPDATE,
90 INTNL_OVERLAY_UPDATE, // Internal Overlay Frame
91 INTNL_ARF_UPDATE, // Internal Altref Frame
92 FRAME_UPDATE_TYPES
93} UENUM1BYTE(FRAME_UPDATE_TYPE);
94
95enum {
96 REFBUF_RESET, // Clear reference frame buffer
97 REFBUF_UPDATE, // Refresh reference frame buffer
98 REFBUF_STATES
99} UENUM1BYTE(REFBUF_STATE);
100
101typedef enum {
102 NO_RESIZE = 0,
103 DOWN_THREEFOUR = 1, // From orig to 3/4.
104 DOWN_ONEHALF = 2, // From orig or 3/4 to 1/2.
105 UP_THREEFOUR = -1, // From 1/2 to 3/4.
106 UP_ORIG = -2, // From 1/2 or 3/4 to orig.
107} RESIZE_ACTION;
108
109typedef enum { ORIG = 0, THREE_QUARTER = 1, ONE_HALF = 2 } RESIZE_STATE;
110
111#define MAX_FIRSTPASS_ANALYSIS_FRAMES 150
112typedef enum region_types {
113 STABLE_REGION = 0,
114 HIGH_VAR_REGION = 1,
115 SCENECUT_REGION = 2,
116 BLENDING_REGION = 3,
117} REGION_TYPES;
118
119typedef struct regions {
120 int start;
121 int last;
122 double avg_noise_var;
123 double avg_cor_coeff;
124 double avg_sr_fr_ratio;
125 double avg_intra_err;
126 double avg_coded_err;
127 REGION_TYPES type;
128} REGIONS;
129
134 typedef struct {
135 // Rate targetting variables
136
141 int base_frame_target;
145 int this_frame_target; // Actual frame target after rc adjustment.
146
150 int projected_frame_size;
151
155 int coefficient_size;
156
160 int sb64_target_rate;
161
165 int frames_since_golden;
166
170 int frames_till_gf_update_due;
171
175 int intervals_till_gf_calculate_due;
176
178 int min_gf_interval;
179 int max_gf_interval;
180 int static_scene_max_gf_interval;
185 int frames_to_key;
187 int frames_since_key;
188 int frames_to_fwd_kf;
189 int is_src_frame_alt_ref;
190 int sframe_due;
191
192 int high_source_sad;
197 int high_source_sad_lag[MAX_GF_INTERVAL];
198 int high_motion_content_screen_rtc;
199 uint64_t avg_source_sad;
200 uint64_t prev_avg_source_sad;
201 uint64_t frame_source_sad;
206 uint64_t frame_source_sad_lag[MAX_GF_INTERVAL];
207 unsigned int last_frame_low_source_sad;
208 uint64_t frame_spatial_variance;
209 int static_since_last_scene_change;
210 int last_encoded_size_keyframe;
211 int last_target_size_keyframe;
212 int frames_since_scene_change;
213 int perc_spatial_flat_blocks;
214 int num_col_blscroll_last_tl0;
215 int num_row_blscroll_last_tl0;
216
217 int avg_frame_bandwidth; // Average frame size target for clip
218 int min_frame_bandwidth; // Minimum allocation used for any frame
219 int max_frame_bandwidth; // Maximum burst rate allowed for a frame.
220 int prev_avg_frame_bandwidth;
221
222 int ni_av_qi;
223 int ni_tot_qi;
224
225 int decimation_factor;
226 int decimation_count;
227 int prev_frame_is_dropped;
228 int drop_count_consec;
229 int max_consec_drop;
230 int force_max_q;
231 int postencode_drop;
232
237 unsigned int frame_number_encoded;
238
243 int worst_quality;
247 int best_quality;
248
250
251 // rate control history for last frame(1) and the frame before(2).
252 // -1: overshoot
253 // 1: undershoot
254 // 0: not initialized.
255 int rc_1_frame;
256 int rc_2_frame;
257 int q_1_frame;
258 int q_2_frame;
259
264 int active_worst_quality;
265
267 // Track amount of low motion in scene
268 int avg_frame_low_motion;
269 int cnt_zeromv;
270
271 // signals if number of blocks with motion is high
272 int percent_blocks_with_motion;
273
274 // signals percentage of 16x16 blocks that are inactive, via active_maps
275 int percent_blocks_inactive;
276
277 // Maximum value of source sad across all blocks of frame.
278 uint64_t max_block_source_sad;
279
280 // For dynamic resize, 1 pass cbr.
281 RESIZE_STATE resize_state;
282 int resize_avg_qp;
283 int resize_buffer_underflow;
284 int resize_count;
285
286 // Flag to disable content related qp adjustment.
287 int rtc_external_ratectrl;
288
289 // Stores fast_extra_bits of the current frame.
290 int frame_level_fast_extra_bits;
291
292 double frame_level_rate_correction_factors[RATE_FACTOR_LEVELS];
293
294 int frame_num_last_gf_refresh;
295
296 int prev_coded_width;
297 int prev_coded_height;
298
299 // The ratio used for inter frames in bit estimation.
300 // TODO(yunqing): if golden frame is treated differently (e.g. gf_cbr_boost_
301 // pct > THR), consider to add bit_est_ratio_g for golden frames.
302 int bit_est_ratio;
303
304 // Whether to use a fixed qp for the frame, bypassing internal rate control.
305 // This flag will reset to 0 after every frame.
306 int use_external_qp_one_pass;
308} RATE_CONTROL;
309
313 typedef struct {
314 // Sub-gop level Rate targetting variables
315
319 int64_t gf_group_bits;
320
324 int kf_boost;
325
329 int gfu_boost;
330
334 int gfu_boost_average;
335
339 int gf_intervals[MAX_NUM_GF_INTERVALS];
340
344 int cur_gf_index;
345
347 int num_regions;
348
349 REGIONS regions[MAX_FIRSTPASS_ANALYSIS_FRAMES];
350 int regions_offset; // offset of regions from the last keyframe
351 int frames_till_regions_update;
352
353 int baseline_gf_interval;
354
355 int constrained_gf_group;
356
357 int this_key_frame_forced;
358
359 int next_key_frame_forced;
361
365 int64_t starting_buffer_level;
366
370 int64_t optimal_buffer_level;
371
375 int64_t maximum_buffer_size;
376
380 int arf_q;
381
383 float_t arf_boost_factor;
384
385 int base_layer_qp;
386
387 // Total number of stats used only for kf_boost calculation.
388 int num_stats_used_for_kf_boost;
389
390 // Total number of stats used only for gfu_boost calculation.
391 int num_stats_used_for_gfu_boost;
392
393 // Total number of stats required by gfu_boost calculation.
394 int num_stats_required_for_gfu_boost;
395
396 int enable_scenecut_detection;
397
398 int use_arf_in_this_kf_group;
399
400 int ni_frames;
401
402 double tot_q;
404
408 int last_kf_qindex;
409
413 int avg_frame_qindex[FRAME_TYPES];
414
415#if CONFIG_FPMT_TEST
420 int temp_active_best_quality[MAX_ARF_LAYERS + 1];
421
426 int temp_last_boosted_qindex;
427
432 double temp_avg_q;
433
438 int temp_last_q[FRAME_TYPES];
439
444 int temp_projected_frame_size;
445
450 int64_t temp_total_actual_bits;
451
456 int64_t temp_buffer_level;
457
462 int64_t temp_vbr_bits_off_target;
463
468 int64_t temp_vbr_bits_off_target_fast;
469
474 double temp_rate_correction_factors[RATE_FACTOR_LEVELS];
475
480 int temp_rate_error_estimate;
481
486 int temp_rolling_arf_group_target_bits;
487
492 int temp_rolling_arf_group_actual_bits;
493
498 int64_t temp_bits_left;
499
504 int temp_extend_minq;
505
510 int temp_extend_maxq;
511
512#endif
516 int active_best_quality[MAX_ARF_LAYERS + 1];
517
521 int last_boosted_qindex;
522
526 double avg_q;
527
531 int last_q[FRAME_TYPES];
532
537 double rate_correction_factors[RATE_FACTOR_LEVELS];
538
542 int64_t total_actual_bits;
543
547 int64_t total_target_bits;
548
552 int64_t buffer_level;
553
557 int rate_error_estimate;
558
562 int64_t vbr_bits_off_target;
563
567 int64_t vbr_bits_off_target_fast;
568
573 int64_t bits_off_target;
574
578 int rolling_target_bits;
579
584 int rolling_actual_bits;
585
590 int q_history[MAX_Q_HISTORY];
591} PRIMARY_RATE_CONTROL;
592
594
595struct AV1_COMP;
596struct AV1EncoderConfig;
597struct GF_GROUP;
598
599void av1_primary_rc_init(const struct AV1EncoderConfig *oxcf,
600 PRIMARY_RATE_CONTROL *p_rc);
601
602void av1_rc_init(const struct AV1EncoderConfig *oxcf, RATE_CONTROL *rc);
603
604int av1_estimate_bits_at_q(const struct AV1_COMP *cpi, int q,
605 double correction_factor);
606
607double av1_convert_qindex_to_q(int qindex, aom_bit_depth_t bit_depth);
608
609// Converts a Q value to a qindex.
610int av1_convert_q_to_qindex(double q, aom_bit_depth_t bit_depth);
611
612void av1_rc_init_minq_luts(void);
613
614int av1_rc_get_default_min_gf_interval(int width, int height, double framerate);
615
616// Generally at the high level, the following flow is expected
617// to be enforced for rate control:
618// First call per frame, one of:
619// av1_get_one_pass_rt_params()
620// av1_get_second_pass_params()
621// depending on the usage to set the rate control encode parameters desired.
622//
623// Then, call encode_frame_to_data_rate() to perform the
624// actual encode. This function will in turn call encode_frame()
625// one or more times, followed by:
626// av1_rc_postencode_update_drop_frame()
627//
628// The majority of rate control parameters are only expected
629// to be set in the av1_get_..._params() functions and
630// updated during the av1_rc_postencode_update...() functions.
631// The only exceptions are av1_rc_drop_frame() and
632// av1_rc_update_rate_correction_factors() functions.
633
634// Functions to set parameters for encoding before the actual
635// encode_frame_to_data_rate() function.
636struct EncodeFrameInput;
637
638// Post encode update of the rate control parameters based
639// on bytes used
640void av1_rc_postencode_update(struct AV1_COMP *cpi, uint64_t bytes_used);
641// Post encode update of the rate control parameters for dropped frames
642void av1_rc_postencode_update_drop_frame(struct AV1_COMP *cpi);
643
658void av1_rc_update_rate_correction_factors(struct AV1_COMP *cpi,
659 int is_encode_stage, int width,
660 int height);
662
663// Decide if we should drop this frame: For 1-pass CBR.
664// Changes only the decimation count in the rate control structure
665int av1_rc_drop_frame(struct AV1_COMP *cpi);
666
667// Computes frame size bounds.
668void av1_rc_compute_frame_size_bounds(const struct AV1_COMP *cpi,
669 int this_frame_target,
670 int *frame_under_shoot_limit,
671 int *frame_over_shoot_limit);
672
674
687int av1_rc_pick_q_and_bounds(struct AV1_COMP *cpi, int width, int height,
688 int gf_index, int *bottom_index, int *top_index);
689
702 int av1_rc_regulate_q(const struct AV1_COMP *cpi, int target_bits_per_frame,
703 int active_best_quality, int active_worst_quality,
704 int width, int height);
705
707// Estimates bits per mb for a given qindex and correction factor.
708int av1_rc_bits_per_mb(const struct AV1_COMP *cpi, FRAME_TYPE frame_type,
709 int qindex, double correction_factor,
710 int accurate_estimate);
711
712// Find q_index corresponding to desired_q, within [best_qindex, worst_qindex].
713// To be precise, 'q_index' is the smallest integer, for which the corresponding
714// q >= desired_q.
715// If no such q index is found, returns 'worst_qindex'.
716int av1_find_qindex(double desired_q, aom_bit_depth_t bit_depth,
717 int best_qindex, int worst_qindex);
718
719// Computes a q delta (in "q index" terms) to get from a starting q value
720// to a target q value
721int av1_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget,
722 aom_bit_depth_t bit_depth);
723
724// Computes a q delta (in "q index" terms) to get from a starting q value
725// to a value that should equate to the given rate ratio.
726int av1_compute_qdelta_by_rate(const struct AV1_COMP *cpi,
727 FRAME_TYPE frame_type, int qindex,
728 double rate_target_ratio);
729
730void av1_rc_update_framerate(struct AV1_COMP *cpi, int width, int height);
731
732void av1_set_target_rate(struct AV1_COMP *cpi, int width, int height);
733
734int av1_resize_one_pass_cbr(struct AV1_COMP *cpi);
735
736void av1_rc_set_frame_target(struct AV1_COMP *cpi, int target, int width,
737 int height);
738
739void av1_adjust_gf_refresh_qp_one_pass_rt(struct AV1_COMP *cpi);
740
741void av1_set_rtc_reference_structure_one_layer(struct AV1_COMP *cpi,
742 int gf_update);
743
756 int av1_calc_pframe_target_size_one_pass_vbr(
757 const struct AV1_COMP *const cpi, FRAME_UPDATE_TYPE frame_update_type);
758
769 int av1_calc_iframe_target_size_one_pass_vbr(const struct AV1_COMP *const cpi);
770
782 int av1_calc_pframe_target_size_one_pass_cbr(
783 const struct AV1_COMP *cpi, FRAME_UPDATE_TYPE frame_update_type);
784
795 int av1_calc_iframe_target_size_one_pass_cbr(const struct AV1_COMP *cpi);
796
815 void av1_get_one_pass_rt_params(struct AV1_COMP *cpi,
816 FRAME_TYPE *const frame_type,
817 const struct EncodeFrameInput *frame_input,
818 unsigned int frame_flags);
819
834int av1_encodedframe_overshoot_cbr(struct AV1_COMP *cpi, int *q);
835
847int av1_postencode_drop_cbr(struct AV1_COMP *cpi, size_t *size);
848
862 void av1_rc_scene_detection_onepass_rt(
863 struct AV1_COMP *cpi, const struct EncodeFrameInput *frame_input);
864
865#ifdef __cplusplus
866} // extern "C"
867#endif
868
869#endif // AOM_AV1_ENCODER_RATECTRL_H_
aom_codec.h
Describes the codec algorithm interface to applications.
aom_bit_depth_t
enum aom_bit_depth aom_bit_depth_t
Bit depth for codecThis enumeration determines the bit depth of the codec.
av1_rc_update_rate_correction_factors
void av1_rc_update_rate_correction_factors(AV1_COMP *cpi, int is_encode_stage, int width, int height)
Updates the rate correction factor linking Q to output bits.
Definition ratectrl.c:940
av1_encodedframe_overshoot_cbr
int av1_encodedframe_overshoot_cbr(AV1_COMP *cpi, int *q)
Increase q on expected encoder overshoot, for CBR mode.
Definition ratectrl.c:4008
av1_postencode_drop_cbr
int av1_postencode_drop_cbr(AV1_COMP *cpi, size_t *size)
Check if frame should be dropped, for RTC mode.
Definition ratectrl.c:4110
av1_rc_pick_q_and_bounds
int av1_rc_pick_q_and_bounds(AV1_COMP *cpi, int width, int height, int gf_index, int *bottom_index, int *top_index)
Picks q and q bounds given the rate control parameters in cpi->rc.
Definition ratectrl.c:2350
av1_set_rtc_reference_structure_one_layer
void av1_set_rtc_reference_structure_one_layer(AV1_COMP *cpi, int gf_update)
Setup the reference prediction structure for 1 pass real-time.
Definition ratectrl.c:3084
AV1EncoderConfig
Main encoder configuration data structure.
Definition encoder.h:944
AV1_COMP
Top level encoder structure.
Definition encoder.h:2907
EncodeFrameInput
Input frames and last input frame.
Definition encoder.h:3750
GF_GROUP
Data related to the current GF/ARF group and the individual frames within the group.
Definition firstpass.h:343
PRIMARY_RATE_CONTROL
Primary Rate Control parameters and status.
Definition ratectrl.h:313
PRIMARY_RATE_CONTROL::q_history
int q_history[MAX_Q_HISTORY]
Definition ratectrl.h:590
PRIMARY_RATE_CONTROL::gf_intervals
int gf_intervals[MAX_NUM_GF_INTERVALS]
Definition ratectrl.h:339
PRIMARY_RATE_CONTROL::gfu_boost_average
int gfu_boost_average
Definition ratectrl.h:334
PRIMARY_RATE_CONTROL::bits_off_target
int64_t bits_off_target
Definition ratectrl.h:573
PRIMARY_RATE_CONTROL::rate_error_estimate
int rate_error_estimate
Definition ratectrl.h:557
PRIMARY_RATE_CONTROL::avg_q
double avg_q
Definition ratectrl.h:526
PRIMARY_RATE_CONTROL::maximum_buffer_size
int64_t maximum_buffer_size
Definition ratectrl.h:375
PRIMARY_RATE_CONTROL::kf_boost
int kf_boost
Definition ratectrl.h:324
PRIMARY_RATE_CONTROL::starting_buffer_level
int64_t starting_buffer_level
Definition ratectrl.h:365
PRIMARY_RATE_CONTROL::last_q
int last_q[FRAME_TYPES]
Definition ratectrl.h:531
PRIMARY_RATE_CONTROL::total_actual_bits
int64_t total_actual_bits
Definition ratectrl.h:542
PRIMARY_RATE_CONTROL::vbr_bits_off_target_fast
int64_t vbr_bits_off_target_fast
Definition ratectrl.h:567
PRIMARY_RATE_CONTROL::rolling_target_bits
int rolling_target_bits
Definition ratectrl.h:578
PRIMARY_RATE_CONTROL::buffer_level
int64_t buffer_level
Definition ratectrl.h:552
PRIMARY_RATE_CONTROL::gfu_boost
int gfu_boost
Definition ratectrl.h:329
PRIMARY_RATE_CONTROL::optimal_buffer_level
int64_t optimal_buffer_level
Definition ratectrl.h:370
PRIMARY_RATE_CONTROL::arf_q
int arf_q
Definition ratectrl.h:380
PRIMARY_RATE_CONTROL::rolling_actual_bits
int rolling_actual_bits
Definition ratectrl.h:584
PRIMARY_RATE_CONTROL::last_boosted_qindex
int last_boosted_qindex
Definition ratectrl.h:521
PRIMARY_RATE_CONTROL::cur_gf_index
int cur_gf_index
Definition ratectrl.h:344
PRIMARY_RATE_CONTROL::rate_correction_factors
double rate_correction_factors[RATE_FACTOR_LEVELS]
Definition ratectrl.h:537
PRIMARY_RATE_CONTROL::total_target_bits
int64_t total_target_bits
Definition ratectrl.h:547
PRIMARY_RATE_CONTROL::last_kf_qindex
int last_kf_qindex
Definition ratectrl.h:408
PRIMARY_RATE_CONTROL::active_best_quality
int active_best_quality[MAX_ARF_LAYERS+1]
Definition ratectrl.h:516
PRIMARY_RATE_CONTROL::gf_group_bits
int64_t gf_group_bits
Definition ratectrl.h:319
PRIMARY_RATE_CONTROL::vbr_bits_off_target
int64_t vbr_bits_off_target
Definition ratectrl.h:562
PRIMARY_RATE_CONTROL::avg_frame_qindex
int avg_frame_qindex[FRAME_TYPES]
Definition ratectrl.h:413
RATE_CONTROL
Rate Control parameters and status.
Definition ratectrl.h:134
RATE_CONTROL::best_quality
int best_quality
Definition ratectrl.h:247
RATE_CONTROL::intervals_till_gf_calculate_due
int intervals_till_gf_calculate_due
Definition ratectrl.h:175
RATE_CONTROL::this_frame_target
int this_frame_target
Definition ratectrl.h:145
RATE_CONTROL::frames_to_key
int frames_to_key
Definition ratectrl.h:185
RATE_CONTROL::base_frame_target
int base_frame_target
Definition ratectrl.h:141
RATE_CONTROL::projected_frame_size
int projected_frame_size
Definition ratectrl.h:150
RATE_CONTROL::worst_quality
int worst_quality
Definition ratectrl.h:243
RATE_CONTROL::sb64_target_rate
int sb64_target_rate
Definition ratectrl.h:160
RATE_CONTROL::coefficient_size
int coefficient_size
Definition ratectrl.h:155
RATE_CONTROL::active_worst_quality
int active_worst_quality
Definition ratectrl.h:264
RATE_CONTROL::frames_since_golden
int frames_since_golden
Definition ratectrl.h:165
RATE_CONTROL::frames_till_gf_update_due
int frames_till_gf_update_due
Definition ratectrl.h:170