/*
* Copyright (c) 2016, Alliance for Open Media. All rights reserved.
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#include <assert.h>
#include <limits.h>
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "aom_dsp/aom_dsp_common.h"
#include "aom_mem/aom_mem.h"
#include "aom_ports/mem.h"
#include "aom_ports/aom_once.h"
#include "av1/common/alloccommon.h"
#include "av1/encoder/aq_cyclicrefresh.h"
#include "av1/common/common.h"
#include "av1/common/entropymode.h"
#include "av1/common/quant_common.h"
#include "av1/common/seg_common.h"
#include "av1/encoder/encodemv.h"
#include "av1/encoder/encoder_utils.h"
#include "av1/encoder/encode_strategy.h"
#include "av1/encoder/gop_structure.h"
#include "av1/encoder/mcomp.h"
#include "av1/encoder/random.h"
#include "av1/encoder/ratectrl.h"
#include "config/aom_dsp_rtcd.h"
#define USE_UNRESTRICTED_Q_IN_CQ_MODE 0
// Max rate target for 1080P and below encodes under normal circumstances
// (1920 * 1080 / (16 * 16)) * MAX_MB_RATE bits per MB
#define MAX_MB_RATE 250
#define MAXRATE_1080P 2025000
#define MIN_BPB_FACTOR 0.005
#define MAX_BPB_FACTOR 50
#define SUPERRES_QADJ_PER_DENOM_KEYFRAME_SOLO 0
#define SUPERRES_QADJ_PER_DENOM_KEYFRAME 2
#define SUPERRES_QADJ_PER_DENOM_ARFFRAME 0
#define FRAME_OVERHEAD_BITS 200
#define ASSIGN_MINQ_TABLE(bit_depth, name) \
do { \
switch (bit_depth) { \
case AOM_BITS_8: name = name
##_8;
break; \
case AOM_BITS_10: name = name
##_10;
break; \
case AOM_BITS_12: name = name
##_12;
break; \
default: \
assert(0 && \
"bit_depth should be AOM_BITS_8, AOM_BITS_10" \
" or AOM_BITS_12"); \
name = NULL; \
} \
}
while (0)
// Tables relating active max Q to active min Q
static int kf_low_motion_minq_8[QINDEX_RANGE];
static int kf_high_motion_minq_8[QINDEX_RANGE];
static int arfgf_low_motion_minq_8[QINDEX_RANGE];
static int arfgf_high_motion_minq_8[QINDEX_RANGE];
static int inter_minq_8[QINDEX_RANGE];
static int rtc_minq_8[QINDEX_RANGE];
static int kf_low_motion_minq_10[QINDEX_RANGE];
static int kf_high_motion_minq_10[QINDEX_RANGE];
static int arfgf_low_motion_minq_10[QINDEX_RANGE];
static int arfgf_high_motion_minq_10[QINDEX_RANGE];
static int inter_minq_10[QINDEX_RANGE];
static int rtc_minq_10[QINDEX_RANGE];
static int kf_low_motion_minq_12[QINDEX_RANGE];
static int kf_high_motion_minq_12[QINDEX_RANGE];
static int arfgf_low_motion_minq_12[QINDEX_RANGE];
static int arfgf_high_motion_minq_12[QINDEX_RANGE];
static int inter_minq_12[QINDEX_RANGE];
static int rtc_minq_12[QINDEX_RANGE];
static int gf_high = 2400;
static int gf_low = 300;
#ifdef STRICT_RC
static int kf_high = 3200;
#else
static int kf_high = 5000;
#endif
static int kf_low = 400;
// How many times less pixels there are to encode given the current scaling.
// Temporary replacement for rcf_mult and rate_thresh_mult.
static double resize_rate_factor(
const FrameDimensionCfg *
const frm_dim_cfg,
int width,
int height) {
return (
double)(frm_dim_cfg->width * frm_dim_cfg->height) / (width * height);
}
// Functions to compute the active minq lookup table entries based on a
// formulaic approach to facilitate easier adjustment of the Q tables.
// The formulae were derived from computing a 3rd order polynomial best
// fit to the original data (after plotting real maxq vs minq (not q index))
static int get_minq_index(
double maxq,
double x3,
double x2,
double x1,
aom_bit_depth_t bit_depth) {
const double minqtarget = AOMMIN(((x3 * maxq + x2) * maxq + x1) * maxq, maxq);
// Special case handling to deal with the step from q2.0
// down to lossless mode represented by q 1.0.
if (minqtarget <= 2.0)
return 0;
return av1_find_qindex(minqtarget, bit_depth, 0, QINDEX_RANGE - 1);
}
static void init_minq_luts(
int *kf_low_m,
int *kf_high_m,
int *arfgf_low,
int *arfgf_high,
int *inter,
int *rtc,
aom_bit_depth_t bit_depth) {
int i;
for (i = 0; i < QINDEX_RANGE; i++) {
const double maxq = av1_convert_qindex_to_q(i, bit_depth);
kf_low_m[i] = get_minq_index(maxq, 0.000001, -0.0004, 0.150, bit_depth);
kf_high_m[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.45, bit_depth);
arfgf_low[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.30, bit_depth);
arfgf_high[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55, bit_depth);
inter[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.90, bit_depth);
rtc[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.70, bit_depth);
}
}
static void rc_init_minq_luts(
void) {
init_minq_luts(kf_low_motion_minq_8, kf_high_motion_minq_8,
arfgf_low_motion_minq_8, arfgf_high_motion_minq_8,
inter_minq_8, rtc_minq_8, AOM_BITS_8);
init_minq_luts(kf_low_motion_minq_10, kf_high_motion_minq_10,
arfgf_low_motion_minq_10, arfgf_high_motion_minq_10,
inter_minq_10, rtc_minq_10, AOM_BITS_10);
init_minq_luts(kf_low_motion_minq_12, kf_high_motion_minq_12,
arfgf_low_motion_minq_12, arfgf_high_motion_minq_12,
inter_minq_12, rtc_minq_12, AOM_BITS_12);
}
void av1_rc_init_minq_luts(
void) { aom_once(rc_init_minq_luts); }
// These functions use formulaic calculations to make playing with the
// quantizer tables easier. If necessary they can be replaced by lookup
// tables if and when things settle down in the experimental bitstream
double av1_convert_qindex_to_q(
int qindex, aom_bit_depth_t bit_depth) {
// Convert the index to a real Q value (scaled down to match old Q values)
switch (bit_depth) {
case AOM_BITS_8:
return av1_ac_quant_QTX(qindex, 0, bit_depth) / 4.0;
case AOM_BITS_10:
return av1_ac_quant_QTX(qindex, 0, bit_depth) / 16.0;
case AOM_BITS_12:
return av1_ac_quant_QTX(qindex, 0, bit_depth) / 64.0;
default:
assert(0 &&
"bit_depth should be AOM_BITS_8, AOM_BITS_10 or AOM_BITS_12");
return -1.0;
}
}
int av1_convert_q_to_qindex(
double q, aom_bit_depth_t bit_depth) {
int qindex = MINQ;
// Find the first qindex that matches or exceeds q.
// Note: this operation can also be done with a binary search, as
// av1_convert_qindex_to_q() is monotonically increasing with respect to
// increasing qindex.
while (qindex < MAXQ && av1_convert_qindex_to_q(qindex, bit_depth) < q) {
qindex++;
}
return qindex;
}
// Gets the appropriate bpmb enumerator based on the frame and content type
static int get_bpmb_enumerator(FRAME_TYPE frame_type,
const int is_screen_content_type) {
int enumerator;
if (is_screen_content_type) {
enumerator = (frame_type == KEY_FRAME) ? 1000000 : 750000;
}
else {
enumerator = (frame_type == KEY_FRAME) ? 2000000 : 1500000;
}
return enumerator;
}
static int get_init_ratio(
double sse) {
return (
int)(300000 / sse); }
// Adjustment based on spatial content and last encoded keyframe.
// Allow for increase in enumerator to reduce overshoot.
static int adjust_rtc_keyframe(
const RATE_CONTROL *rc,
int enumerator) {
// Don't adjust if most of the image is flat.
if (rc->perc_spatial_flat_blocks > 70)
return enumerator;
if (rc->last_encoded_size_keyframe == 0 ||
rc->frames_since_scene_change < rc->frames_since_key) {
// Very first frame, or if scene change happened after last keyframe.
if (rc->frame_spatial_variance > 1000 ||
(rc->frame_spatial_variance > 500 && rc->perc_spatial_flat_blocks == 0))
return enumerator << 3;
else if (rc->frame_spatial_variance > 500 &&
rc->perc_spatial_flat_blocks < 10)
return enumerator << 2;
else if (rc->frame_spatial_variance > 400)
return enumerator << 1;
}
else if (rc->frames_since_scene_change >= rc->frames_since_key) {
// There was no scene change before previous encoded keyframe, so
// use the last_encoded/target_size_keyframe.
if (rc->last_encoded_size_keyframe > 4 * rc->last_target_size_keyframe &&
rc->frame_spatial_variance > 500)
return enumerator << 3;
else if (rc->last_encoded_size_keyframe >
2 * rc->last_target_size_keyframe &&
rc->frame_spatial_variance > 200)
return enumerator << 2;
else if (rc->last_encoded_size_keyframe > rc->last_target_size_keyframe)
return enumerator << 1;
}
return enumerator;
}
int av1_rc_bits_per_mb(
const AV1_COMP *cpi, FRAME_TYPE frame_type,
int qindex,
double correction_factor,
int accurate_estimate) {
const AV1_COMMON *
const cm = &cpi->common;
const int is_screen_content_type = cpi->is_screen_content_type;
const aom_bit_depth_t bit_depth = cm->seq_params->bit_depth;
const double q = av1_convert_qindex_to_q(qindex, bit_depth);
int enumerator = get_bpmb_enumerator(frame_type, is_screen_content_type);
assert(correction_factor <= MAX_BPB_FACTOR &&
correction_factor >= MIN_BPB_FACTOR);
if (cpi->oxcf.rc_cfg.mode == AOM_CBR && frame_type != KEY_FRAME &&
accurate_estimate && cpi->rec_sse != UINT64_MAX) {
const int mbs = cm->mi_params.MBs;
const double sse_sqrt =
(
double)((
int)sqrt((
double)(cpi->rec_sse)) << BPER_MB_NORMBITS) /
(
double)mbs;
const int ratio = (cpi->rc.bit_est_ratio == 0) ? get_init_ratio(sse_sqrt)
: cpi->rc.bit_est_ratio;
// Clamp the enumerator to lower the q fluctuations.
enumerator = AOMMIN(AOMMAX((
int)(ratio * sse_sqrt), 20000), 170000);
}
else if (cpi->oxcf.rc_cfg.mode == AOM_CBR && frame_type == KEY_FRAME &&
cpi->sf.rt_sf.rc_adjust_keyframe && bit_depth == 8 &&
cpi->oxcf.rc_cfg.max_intra_bitrate_pct > 0 &&
cpi->svc.spatial_layer_id == 0) {
enumerator = adjust_rtc_keyframe(&cpi->rc, enumerator);
}
// q based adjustment to baseline enumerator
return (
int)(enumerator * correction_factor / q);
}
int av1_estimate_bits_at_q(
const AV1_COMP *cpi,
int q,
double correction_factor) {
const AV1_COMMON *
const cm = &cpi->common;
const FRAME_TYPE frame_type = cm->current_frame.frame_type;
const int mbs = cm->mi_params.MBs;
const int bpm =
(
int)(av1_rc_bits_per_mb(cpi, frame_type, q, correction_factor,
cpi->sf.hl_sf.accurate_bit_estimate));
return AOMMAX(FRAME_OVERHEAD_BITS,
(
int)((uint64_t)bpm * mbs) >> BPER_MB_NORMBITS);
}
static int clamp_pframe_target_size(
const AV1_COMP *
const cpi, int64_t target,
FRAME_UPDATE_TYPE frame_update_type) {
const RATE_CONTROL *rc = &cpi->rc;
const RateControlCfg *
const rc_cfg = &cpi->oxcf.rc_cfg;
const int min_frame_target =
AOMMAX(rc->min_frame_bandwidth, rc->avg_frame_bandwidth >> 5);
// Clip the frame target to the minimum setup value.
if (frame_update_type == OVERLAY_UPDATE ||
frame_update_type == INTNL_OVERLAY_UPDATE) {
// If there is an active ARF at this location use the minimum
// bits on this frame even if it is a constructed arf.
// The active maximum quantizer insures that an appropriate
// number of bits will be spent if needed for constructed ARFs.
target = min_frame_target;
}
else if (target < min_frame_target) {
target = min_frame_target;
}
// Clip the frame target to the maximum allowed value.
if (target > rc->max_frame_bandwidth) target = rc->max_frame_bandwidth;
if (rc_cfg->max_inter_bitrate_pct) {
const int64_t max_rate =
(int64_t)rc->avg_frame_bandwidth * rc_cfg->max_inter_bitrate_pct / 100;
target = AOMMIN(target, max_rate);
}
return (
int)target;
}
static int clamp_iframe_target_size(
const AV1_COMP *
const cpi, int64_t target) {
const RATE_CONTROL *rc = &cpi->rc;
const RateControlCfg *
const rc_cfg = &cpi->oxcf.rc_cfg;
if (rc_cfg->max_intra_bitrate_pct) {
const int64_t max_rate =
(int64_t)rc->avg_frame_bandwidth * rc_cfg->max_intra_bitrate_pct / 100;
target = AOMMIN(target, max_rate);
}
if (target > rc->max_frame_bandwidth) target = rc->max_frame_bandwidth;
return (
int)target;
}
// Update the buffer level for higher temporal layers, given the encoded current
// temporal layer.
static void update_layer_buffer_level(SVC *svc,
int encoded_frame_size,
bool is_screen) {
const int current_temporal_layer = svc->temporal_layer_id;
for (
int i = current_temporal_layer + 1; i < svc->number_temporal_layers;
++i) {
const int layer =
LAYER_IDS_TO_IDX(svc->spatial_layer_id, i, svc->number_temporal_layers);
LAYER_CONTEXT *lc = &svc->layer_context[layer];
PRIMARY_RATE_CONTROL *lp_rc = &lc->p_rc;
lp_rc->bits_off_target +=
(
int)round(lc->target_bandwidth / lc->framerate) - encoded_frame_size;
// Clip buffer level to maximum buffer size for the layer.
lp_rc->bits_off_target =
AOMMIN(lp_rc->bits_off_target, lp_rc->maximum_buffer_size);
lp_rc->buffer_level = lp_rc->bits_off_target;
// For screen-content mode: don't let buffer level go below threshold,
// given here as -rc->maximum_ buffer_size, to allow buffer to come back
// up sooner after slide change with big overshoot.
if (is_screen) {
lp_rc->bits_off_target =
AOMMAX(lp_rc->bits_off_target, -lp_rc->maximum_buffer_size);
lp_rc->buffer_level = lp_rc->bits_off_target;
}
}
}
// Update the buffer level: leaky bucket model.
static void update_buffer_level(AV1_COMP *cpi,
int encoded_frame_size) {
const AV1_COMMON *
const cm = &cpi->common;
RATE_CONTROL *
const rc = &cpi->rc;
PRIMARY_RATE_CONTROL *
const p_rc = &cpi->ppi->p_rc;
// Non-viewable frames are a special case and are treated as pure overhead.
if (!cm->show_frame)
p_rc->bits_off_target -= encoded_frame_size;
else
p_rc->bits_off_target += rc->avg_frame_bandwidth - encoded_frame_size;
// Clip the buffer level to the maximum specified buffer size.
p_rc->bits_off_target =
AOMMIN(p_rc->bits_off_target, p_rc->maximum_buffer_size);
// For screen-content mode: don't let buffer level go below threshold,
// given here as -rc->maximum_ buffer_size, to allow buffer to come back
// up sooner after slide change with big overshoot.
if (cpi->oxcf.tune_cfg.content == AOM_CONTENT_SCREEN)
p_rc->bits_off_target =
AOMMAX(p_rc->bits_off_target, -p_rc->maximum_buffer_size);
p_rc->buffer_level = p_rc->bits_off_target;
if (cpi->ppi->use_svc)
update_layer_buffer_level(&cpi->svc, encoded_frame_size,
cpi->oxcf.tune_cfg.content == AOM_CONTENT_SCREEN);
#if CONFIG_FPMT_TEST
/* The variable temp_buffer_level is introduced for quality
* simulation purpose, it retains the value previous to the parallel
* encode frames. The variable is updated based on the update flag.
*
* If there exist show_existing_frames between parallel frames, then to
* retain the temp state do not update it. */
int show_existing_between_parallel_frames =
(cpi->ppi->gf_group.update_type[cpi->gf_frame_index] ==
INTNL_OVERLAY_UPDATE &&
cpi->ppi->gf_group.frame_parallel_level[cpi->gf_frame_index + 1] == 2);
if (cpi->do_frame_data_update && !show_existing_between_parallel_frames &&
cpi->ppi->fpmt_unit_test_cfg == PARALLEL_SIMULATION_ENCODE) {
p_rc->temp_buffer_level = p_rc->buffer_level;
}
#endif
}
int av1_rc_get_default_min_gf_interval(
int width,
int height,
double framerate) {
// Assume we do not need any constraint lower than 4K 20 fps
static const double factor_safe = 3840 * 2160 * 20.0;
const double factor = (
double)width * height * framerate;
const int default_interval =
clamp((
int)(framerate * 0.125), MIN_GF_INTERVAL, MAX_GF_INTERVAL);
if (factor <= factor_safe)
return default_interval;
else
return AOMMAX(default_interval,
(
int)(MIN_GF_INTERVAL * factor / factor_safe + 0.5));
// Note this logic makes:
// 4K24: 5
// 4K30: 6
// 4K60: 12
}
// Note get_default_max_gf_interval() requires the min_gf_interval to
// be passed in to ensure that the max_gf_interval returned is at least as big
// as that.
static int get_default_max_gf_interval(
double framerate,
int min_gf_interval) {
int interval = AOMMIN(MAX_GF_INTERVAL, (
int)(framerate * 0.75));
interval += (interval & 0x01);
// Round to even value
interval = AOMMAX(MAX_GF_INTERVAL, interval);
return AOMMAX(interval, min_gf_interval);
}
void av1_primary_rc_init(
const AV1EncoderConfig *oxcf,
PRIMARY_RATE_CONTROL *p_rc) {
const RateControlCfg *
const rc_cfg = &oxcf->rc_cfg;
int worst_allowed_q = rc_cfg->worst_allowed_q;
int min_gf_interval = oxcf->gf_cfg.min_gf_interval;
int max_gf_interval = oxcf->gf_cfg.max_gf_interval;
if (min_gf_interval == 0)
min_gf_interval = av1_rc_get_default_min_gf_interval(
oxcf->frm_dim_cfg.width, oxcf->frm_dim_cfg.height,
oxcf->input_cfg.init_framerate);
if (max_gf_interval == 0)
max_gf_interval = get_default_max_gf_interval(
oxcf->input_cfg.init_framerate, min_gf_interval);
p_rc->baseline_gf_interval = (min_gf_interval + max_gf_interval) / 2;
p_rc->this_key_frame_forced = 0;
p_rc->next_key_frame_forced = 0;
p_rc->ni_frames = 0;
p_rc->tot_q = 0.0;
p_rc->total_actual_bits = 0;
p_rc->total_target_bits = 0;
p_rc->buffer_level = p_rc->starting_buffer_level;
if (oxcf->target_seq_level_idx[0] < SEQ_LEVELS) {
worst_allowed_q = 255;
}
if (oxcf->pass == AOM_RC_ONE_PASS && rc_cfg->mode == AOM_CBR) {
p_rc->avg_frame_qindex[KEY_FRAME] = worst_allowed_q;
p_rc->avg_frame_qindex[INTER_FRAME] = worst_allowed_q;
}
else {
p_rc->avg_frame_qindex[KEY_FRAME] =
(worst_allowed_q + rc_cfg->best_allowed_q) / 2;
p_rc->avg_frame_qindex[INTER_FRAME] =
(worst_allowed_q + rc_cfg->best_allowed_q) / 2;
}
p_rc->avg_q = av1_convert_qindex_to_q(rc_cfg->worst_allowed_q,
oxcf->tool_cfg.bit_depth);
p_rc->last_q[KEY_FRAME] = rc_cfg->best_allowed_q;
p_rc->last_q[INTER_FRAME] = rc_cfg->worst_allowed_q;
for (
int i = 0; i < RATE_FACTOR_LEVELS; ++i) {
p_rc->rate_correction_factors[i] = 0.7;
}
p_rc->rate_correction_factors[KF_STD] = 1.0;
p_rc->bits_off_target = p_rc->starting_buffer_level;
p_rc->rolling_target_bits = AOMMAX(
1, (
int)(oxcf->rc_cfg.target_bandwidth / oxcf->input_cfg.init_framerate));
p_rc->rolling_actual_bits = AOMMAX(
1, (
int)(oxcf->rc_cfg.target_bandwidth / oxcf->input_cfg.init_framerate));
}
void av1_rc_init(
const AV1EncoderConfig *oxcf, RATE_CONTROL *rc) {
const RateControlCfg *
const rc_cfg = &oxcf->rc_cfg;
rc->frames_since_key = 8;
// Sensible default for first frame.
rc->frames_to_fwd_kf = oxcf->kf_cfg.fwd_kf_dist;
rc->frames_till_gf_update_due = 0;
rc->ni_av_qi = rc_cfg->worst_allowed_q;
rc->ni_tot_qi = 0;
rc->min_gf_interval = oxcf->gf_cfg.min_gf_interval;
rc->max_gf_interval = oxcf->gf_cfg.max_gf_interval;
if (rc->min_gf_interval == 0)
rc->min_gf_interval = av1_rc_get_default_min_gf_interval(
oxcf->frm_dim_cfg.width, oxcf->frm_dim_cfg.height,
oxcf->input_cfg.init_framerate);
if (rc->max_gf_interval == 0)
rc->max_gf_interval = get_default_max_gf_interval(
oxcf->input_cfg.init_framerate, rc->min_gf_interval);
rc->avg_frame_low_motion = 0;
rc->resize_state = ORIG;
rc->resize_avg_qp = 0;
rc->resize_buffer_underflow = 0;
rc->resize_count = 0;
rc->rtc_external_ratectrl = 0;
rc->frame_level_fast_extra_bits = 0;
rc->use_external_qp_one_pass = 0;
rc->percent_blocks_inactive = 0;
rc->force_max_q = 0;
rc->postencode_drop = 0;
rc->frames_since_scene_change = 0;
}
static bool check_buffer_below_thresh(AV1_COMP *cpi, int64_t buffer_level,
int drop_mark) {
SVC *svc = &cpi->svc;
if (!cpi->ppi->use_svc || cpi->svc.number_spatial_layers == 1 ||
cpi->svc.framedrop_mode == AOM_LAYER_DROP) {
return (buffer_level <= drop_mark);
}
else {
// For SVC in the AOM_FULL_SUPERFRAME_DROP): the condition on
// buffer is checked on current and upper spatial layers.
for (
int i = svc->spatial_layer_id; i < svc->number_spatial_layers; ++i) {
const int layer = LAYER_IDS_TO_IDX(i, svc->temporal_layer_id,
svc->number_temporal_layers);
LAYER_CONTEXT *lc = &svc->layer_context[layer];
PRIMARY_RATE_CONTROL *lrc = &lc->p_rc;
// Exclude check for layer whose bitrate is 0.
if (lc->target_bandwidth > 0) {
const int drop_thresh = cpi->oxcf.rc_cfg.drop_frames_water_mark;
const int drop_mark_layer =
(
int)(drop_thresh * lrc->optimal_buffer_level / 100);
if (lrc->buffer_level <= drop_mark_layer)
return true;
}
}
return false;
}
}
int av1_rc_drop_frame(AV1_COMP *cpi) {
const AV1EncoderConfig *oxcf = &cpi->oxcf;
RATE_CONTROL *
const rc = &cpi->rc;
PRIMARY_RATE_CONTROL *
const p_rc = &cpi->ppi->p_rc;
#if CONFIG_FPMT_TEST
const int simulate_parallel_frame =
cpi->ppi->gf_group.frame_parallel_level[cpi->gf_frame_index] > 0 &&
cpi->ppi->fpmt_unit_test_cfg == PARALLEL_SIMULATION_ENCODE;
int64_t buffer_level =
simulate_parallel_frame ? p_rc->temp_buffer_level : p_rc->buffer_level;
#else
int64_t buffer_level = p_rc->buffer_level;
#endif
// Never drop on key frame, or for frame whose base layer is key.
// If drop_count_consec hits or exceeds max_consec_drop then don't drop.
if (cpi->common.current_frame.frame_type == KEY_FRAME ||
(cpi->ppi->use_svc &&
cpi->svc.layer_context[cpi->svc.temporal_layer_id].is_key_frame) ||
!oxcf->rc_cfg.drop_frames_water_mark ||
(rc->max_consec_drop > 0 &&
rc->drop_count_consec >= rc->max_consec_drop)) {
return 0;
}
else {
SVC *svc = &cpi->svc;
// In the full_superframe framedrop mode for svc, if the previous spatial
// layer was dropped, drop the current spatial layer.
if (cpi->ppi->use_svc && svc->spatial_layer_id > 0 &&
svc->drop_spatial_layer[svc->spatial_layer_id - 1] &&
svc->framedrop_mode == AOM_FULL_SUPERFRAME_DROP)
return 1;
// -1 is passed here for drop_mark since we are checking if
// buffer goes below 0 (<= -1).
if (check_buffer_below_thresh(cpi, buffer_level, -1)) {
// Always drop if buffer is below 0.
rc->drop_count_consec++;
return 1;
}
else {
// If buffer is below drop_mark, for now just drop every other frame
// (starting with the next frame) until it increases back over drop_mark.
const int drop_mark = (
int)(oxcf->rc_cfg.drop_frames_water_mark *
p_rc->optimal_buffer_level / 100);
const bool buffer_below_thresh =
check_buffer_below_thresh(cpi, buffer_level, drop_mark);
if (!buffer_below_thresh && rc->decimation_factor > 0) {
--rc->decimation_factor;
}
else if (buffer_below_thresh && rc->decimation_factor == 0) {
rc->decimation_factor = 1;
}
if (rc->decimation_factor > 0) {
if (rc->decimation_count > 0) {
--rc->decimation_count;
rc->drop_count_consec++;
return 1;
}
else {
rc->decimation_count = rc->decimation_factor;
return 0;
}
}
else {
rc->decimation_count = 0;
return 0;
}
}
}
}
static int adjust_q_cbr(
const AV1_COMP *cpi,
int q,
int active_worst_quality,
int width,
int height) {
const RATE_CONTROL *
const rc = &cpi->rc;
const PRIMARY_RATE_CONTROL *
const p_rc = &cpi->ppi->p_rc;
const AV1_COMMON *
const cm = &cpi->common;
const SVC *
const svc = &cpi->svc;
const RefreshFrameInfo *
const refresh_frame = &cpi->refresh_frame;
// Flag to indicate previous frame has overshoot, and buffer level
// for current frame is low (less than ~half of optimal). For such
// (inter) frames, if the source_sad is non-zero, relax the max_delta_up
// and clamp applied below.
const bool overshoot_buffer_low =
cpi->rc.rc_1_frame == -1 && rc->frame_source_sad > 1000 &&
p_rc->buffer_level < (p_rc->optimal_buffer_level >> 1) &&
rc->frames_since_key > 4;
int max_delta_down;
int max_delta_up = overshoot_buffer_low ? 120 : 20;
const int change_avg_frame_bandwidth =
abs(rc->avg_frame_bandwidth - rc->prev_avg_frame_bandwidth) >
0.1 * (rc->avg_frame_bandwidth);
// Set the maximum adjustment down for Q for this frame.
if (cpi->oxcf.q_cfg.aq_mode == CYCLIC_REFRESH_AQ &&
cpi->cyclic_refresh->apply_cyclic_refresh) {
// For static screen type content limit the Q drop till the start of the
// next refresh cycle.
if (cpi->is_screen_content_type &&
(cpi->cyclic_refresh->sb_index > cpi->cyclic_refresh->last_sb_index)) {
max_delta_down = AOMMIN(8, AOMMAX(1, rc->q_1_frame / 32));
}
else {
max_delta_down = AOMMIN(16, AOMMAX(1, rc->q_1_frame / 8));
}
if (!cpi->ppi->use_svc && cpi->is_screen_content_type) {
// Link max_delta_up to max_delta_down and buffer status.
if (p_rc->buffer_level > p_rc->optimal_buffer_level) {
max_delta_up = AOMMAX(4, max_delta_down);
}
else if (!overshoot_buffer_low) {
max_delta_up = AOMMAX(8, max_delta_down);
}
}
}
else {
max_delta_down = (cpi->is_screen_content_type)
? AOMMIN(8, AOMMAX(1, rc->q_1_frame / 16))
: AOMMIN(16, AOMMAX(1, rc->q_1_frame / 8));
}
// For screen static content with stable buffer level: relax the
// limit on max_delta_down and apply bias qp, based on buffer fullness.
// Only for high speeds levels for now to avoid bdrate regression.
if (cpi->sf.rt_sf.rc_faster_convergence_static == 1 &&
cpi->sf.rt_sf.check_scene_detection && rc->frame_source_sad == 0 &&
rc->static_since_last_scene_change &&
p_rc->buffer_level > (p_rc->optimal_buffer_level >> 1) &&
cpi->oxcf.q_cfg.aq_mode == CYCLIC_REFRESH_AQ &&
cpi->cyclic_refresh->counter_encode_maxq_scene_change > 4) {
int qp_delta = 32;
int qp_bias = 16;
if (p_rc->buffer_level > p_rc->optimal_buffer_level) {
qp_delta = 60;
qp_bias = 32;
}
if (cpi->rc.rc_1_frame == 1) q = q - qp_bias;
max_delta_down = AOMMAX(max_delta_down, qp_delta);
max_delta_up = AOMMIN(max_delta_up, 4);
}
// If resolution changes or avg_frame_bandwidth significantly changed,
// then set this flag to indicate change in target bits per macroblock.
const int change_target_bits_mb =
cm->prev_frame &&
(width != cm->prev_frame->width || height != cm->prev_frame->height ||
change_avg_frame_bandwidth);
// Apply some control/clamp to QP under certain conditions.
// Delay the use of the clamping for svc until after num_temporal_layers,
// to make they have been set for each temporal layer.
// Check for rc->q_1/2_frame > 0 in case they have not been set due to
// dropped frames.
if (!frame_is_intra_only(cm) && rc->frames_since_key > 1 &&
rc->q_1_frame > 0 && rc->q_2_frame > 0 &&
(!cpi->ppi->use_svc ||
svc->current_superframe > (
unsigned int)svc->number_temporal_layers) &&
!change_target_bits_mb && !cpi->rc.rtc_external_ratectrl &&
(!cpi->oxcf.rc_cfg.gf_cbr_boost_pct ||
!(refresh_frame->alt_ref_frame || refresh_frame->golden_frame))) {
// If in the previous two frames we have seen both overshoot and undershoot
// clamp Q between the two.
if (rc->rc_1_frame * rc->rc_2_frame == -1 &&
rc->q_1_frame != rc->q_2_frame && !overshoot_buffer_low) {
int qclamp = clamp(q, AOMMIN(rc->q_1_frame, rc->q_2_frame),
AOMMAX(rc->q_1_frame, rc->q_2_frame));
// If the previous frame had overshoot and the current q needs to
// increase above the clamped value, reduce the clamp for faster reaction
// to overshoot.
if (cpi->rc.rc_1_frame == -1 && q > qclamp && rc->frames_since_key > 10)
q = (q + qclamp) >> 1;
else
q = qclamp;
}
// Adjust Q base on source content change from scene detection.
if (cpi->sf.rt_sf.check_scene_detection && rc->prev_avg_source_sad > 0 &&
rc->frames_since_key > 10 && rc->frame_source_sad > 0 &&
!cpi->rc.rtc_external_ratectrl) {
const int bit_depth = cm->seq_params->bit_depth;
double delta =
(
double)rc->avg_source_sad / (
double)rc->prev_avg_source_sad - 1.0;
// Push Q downwards if content change is decreasing and buffer level
// is stable (at least 1/4-optimal level), so not overshooting. Do so
// only for high Q to avoid excess overshoot.
// Else reduce decrease in Q from previous frame if content change is
// increasing and buffer is below max (so not undershooting).
if (delta < 0.0 &&
p_rc->buffer_level > (p_rc->optimal_buffer_level >> 2) &&
q > (rc->worst_quality >> 1)) {
double q_adj_factor = 1.0 + 0.5 * tanh(4.0 * delta);
double q_val = av1_convert_qindex_to_q(q, bit_depth);
q += av1_compute_qdelta(rc, q_val, q_val * q_adj_factor, bit_depth);
}
else if (rc->q_1_frame - q > 0 && delta > 0.1 &&
p_rc->buffer_level < AOMMIN(p_rc->maximum_buffer_size,
p_rc->optimal_buffer_level << 1)) {
q = (3 * q + rc->q_1_frame) >> 2;
}
}
// Limit the decrease in Q from previous frame.
if (rc->q_1_frame - q > max_delta_down) q = rc->q_1_frame - max_delta_down;
// Limit the increase in Q from previous frame.
else if (q - rc->q_1_frame > max_delta_up)
q = rc->q_1_frame + max_delta_up;
}
// Adjustment for temporal layers.
if (svc->number_temporal_layers > 1 && svc->spatial_layer_id == 0 &&
!change_target_bits_mb && !cpi->rc.rtc_external_ratectrl &&
cpi->oxcf.resize_cfg.resize_mode != RESIZE_DYNAMIC) {
if (svc->temporal_layer_id > 0) {
// Constrain enhancement relative to the previous base TL0.
// Get base temporal layer TL0.
const int layer = LAYER_IDS_TO_IDX(0, 0, svc->number_temporal_layers);
LAYER_CONTEXT *lc = &svc->layer_context[layer];
// lc->rc.avg_frame_bandwidth and lc->p_rc.last_q correspond to the
// last TL0 frame.
const int last_qindex_tl0 =
rc->frames_since_key < svc->number_temporal_layers
? lc->p_rc.last_q[KEY_FRAME]
: lc->p_rc.last_q[INTER_FRAME];
if (rc->avg_frame_bandwidth < lc->rc.avg_frame_bandwidth &&
q < last_qindex_tl0 - 4)
q = last_qindex_tl0 - 4;
}
else if (cpi->svc.temporal_layer_id == 0 && !frame_is_intra_only(cm) &&
p_rc->buffer_level > (p_rc->optimal_buffer_level >> 2) &&
rc->frame_source_sad < 100000) {
// Push base TL0 Q down if buffer is stable and frame_source_sad
// is below threshold.
int delta = (svc->number_temporal_layers == 2) ? 4 : 10;
q = q - delta;
}
}
// For non-svc (single layer): if resolution has increased push q closer
// to the active_worst to avoid excess overshoot.
if (!cpi->ppi->use_svc && cm->prev_frame &&
(width * height > 1.5 * cm->prev_frame->width * cm->prev_frame->height))
q = (q + active_worst_quality) >> 1;
// For single layer RPS: Bias Q based on distance of closest reference.
if (cpi->ppi->rtc_ref.bias_recovery_frame) {
const int min_dist = av1_svc_get_min_ref_dist(cpi);
q = q - AOMMIN(min_dist, 20);
}
return AOMMAX(AOMMIN(q, cpi->rc.worst_quality), cpi->rc.best_quality);
}
static const RATE_FACTOR_LEVEL rate_factor_levels[FRAME_UPDATE_TYPES] = {
KF_STD,
// KF_UPDATE
INTER_NORMAL,
// LF_UPDATE
GF_ARF_STD,
// GF_UPDATE
GF_ARF_STD,
// ARF_UPDATE
INTER_NORMAL,
// OVERLAY_UPDATE
INTER_NORMAL,
// INTNL_OVERLAY_UPDATE
GF_ARF_LOW,
// INTNL_ARF_UPDATE
};
static RATE_FACTOR_LEVEL get_rate_factor_level(
const GF_GROUP *
const gf_group,
int gf_frame_index) {
const FRAME_UPDATE_TYPE update_type = gf_group->update_type[gf_frame_index];
assert(update_type < FRAME_UPDATE_TYPES);
return rate_factor_levels[update_type];
}
/*!\brief Gets a rate vs Q correction factor
*
* This function returns the current value of a correction factor used to
* dynamically adjust the relationship between Q and the expected number
* of bits for the frame.
*
* \ingroup rate_control
* \param[in] cpi Top level encoder instance structure
* \param[in] width Frame width
* \param[in] height Frame height
*
* \return Returns a correction factor for the current frame
*/
static double get_rate_correction_factor(
const AV1_COMP *cpi,
int width,
int height) {
const RATE_CONTROL *
const rc = &cpi->rc;
const PRIMARY_RATE_CONTROL *
const p_rc = &cpi->ppi->p_rc;
const RefreshFrameInfo *
const refresh_frame = &cpi->refresh_frame;
double rcf;
double rate_correction_factors_kfstd;
double rate_correction_factors_gfarfstd;
double rate_correction_factors_internormal;
rate_correction_factors_kfstd =
(cpi->ppi->gf_group.frame_parallel_level[cpi->gf_frame_index] > 0)
? rc->frame_level_rate_correction_factors[KF_STD]
: p_rc->rate_correction_factors[KF_STD];
rate_correction_factors_gfarfstd =
(cpi->ppi->gf_group.frame_parallel_level[cpi->gf_frame_index] > 0)
? rc->frame_level_rate_correction_factors[GF_ARF_STD]
: p_rc->rate_correction_factors[GF_ARF_STD];
rate_correction_factors_internormal =
(cpi->ppi->gf_group.frame_parallel_level[cpi->gf_frame_index] > 0)
? rc->frame_level_rate_correction_factors[INTER_NORMAL]
: p_rc->rate_correction_factors[INTER_NORMAL];
if (cpi->common.current_frame.frame_type == KEY_FRAME) {
rcf = rate_correction_factors_kfstd;
}
else if (is_stat_consumption_stage(cpi)) {
const RATE_FACTOR_LEVEL rf_lvl =
get_rate_factor_level(&cpi->ppi->gf_group, cpi->gf_frame_index);
double rate_correction_factors_rflvl =
(cpi->ppi->gf_group.frame_parallel_level[cpi->gf_frame_index] > 0)
? rc->frame_level_rate_correction_factors[rf_lvl]
: p_rc->rate_correction_factors[rf_lvl];
rcf = rate_correction_factors_rflvl;
}
else {
if ((refresh_frame->alt_ref_frame || refresh_frame->golden_frame) &&
!rc->is_src_frame_alt_ref && !cpi->ppi->use_svc &&
(cpi->oxcf.rc_cfg.mode != AOM_CBR ||
cpi->oxcf.rc_cfg.gf_cbr_boost_pct > 20))
rcf = rate_correction_factors_gfarfstd;
else
rcf = rate_correction_factors_internormal;
}
rcf *= resize_rate_factor(&cpi->oxcf.frm_dim_cfg, width, height);
return fclamp(rcf, MIN_BPB_FACTOR, MAX_BPB_FACTOR);
}
/*!\brief Sets a rate vs Q correction factor
*
* This function updates the current value of a correction factor used to
* dynamically adjust the relationship between Q and the expected number
* of bits for the frame.
*
* \ingroup rate_control
* \param[in] cpi Top level encoder instance structure
* \param[in] is_encode_stage Indicates if recode loop or post-encode
* \param[in] factor New correction factor
* \param[in] width Frame width
* \param[in] height Frame height
*
* \remark Updates the rate correction factor for the
* current frame type in cpi->rc.
*/
static void set_rate_correction_factor(AV1_COMP *cpi,
int is_encode_stage,
double factor,
int width,
int height) {
RATE_CONTROL *
const rc = &cpi->rc;
PRIMARY_RATE_CONTROL *
const p_rc = &cpi->ppi->p_rc;
const RefreshFrameInfo *
const refresh_frame = &cpi->refresh_frame;
int update_default_rcf = 1;
// Normalize RCF to account for the size-dependent scaling factor.
factor /= resize_rate_factor(&cpi->oxcf.frm_dim_cfg, width, height);
factor = fclamp(factor, MIN_BPB_FACTOR, MAX_BPB_FACTOR);
if (cpi->common.current_frame.frame_type == KEY_FRAME) {
p_rc->rate_correction_factors[KF_STD] = factor;
}
else if (is_stat_consumption_stage(cpi)) {
const RATE_FACTOR_LEVEL rf_lvl =
get_rate_factor_level(&cpi->ppi->gf_group, cpi->gf_frame_index);
if (is_encode_stage &&
cpi->ppi->gf_group.frame_parallel_level[cpi->gf_frame_index] > 0) {
rc->frame_level_rate_correction_factors[rf_lvl] = factor;
update_default_rcf = 0;
}
if (update_default_rcf) p_rc->rate_correction_factors[rf_lvl] = factor;
}
else {
if ((refresh_frame->alt_ref_frame || refresh_frame->golden_frame) &&
!rc->is_src_frame_alt_ref && !cpi->ppi->use_svc &&
(cpi->oxcf.rc_cfg.mode != AOM_CBR ||
cpi->oxcf.rc_cfg.gf_cbr_boost_pct > 20)) {
p_rc->rate_correction_factors[GF_ARF_STD] = factor;
}
else {
if (is_encode_stage &&
cpi->ppi->gf_group.frame_parallel_level[cpi->gf_frame_index] > 0) {
rc->frame_level_rate_correction_factors[INTER_NORMAL] = factor;
update_default_rcf = 0;
}
if (update_default_rcf)
p_rc->rate_correction_factors[INTER_NORMAL] = factor;
}
}
}
void av1_rc_update_rate_correction_factors(AV1_COMP *cpi,
int is_encode_stage,
int width,
int height) {
const AV1_COMMON *
const cm = &cpi->common;
double correction_factor = 1.0;
double rate_correction_factor =
get_rate_correction_factor(cpi, width, height);
double adjustment_limit;
int projected_size_based_on_q = 0;
int cyclic_refresh_active =
cpi->oxcf.q_cfg.aq_mode == CYCLIC_REFRESH_AQ && cpi->common.seg.enabled;
// Do not update the rate factors for arf overlay frames.
if (cpi->rc.is_src_frame_alt_ref)
return;
// Don't update rate correction factors here on scene changes as
// it is already reset in av1_encodedframe_overshoot_cbr(),
// but reset variables related to previous frame q and size.
// Note that the counter of frames since the last scene change
// is only valid when cyclic refresh mode is enabled and that
// this break out only applies to scene changes that are not
// recorded as INTRA only key frames.
// Note that av1_encodedframe_overshoot_cbr() is only entered
// if cpi->sf.rt_sf.overshoot_detection_cbr == FAST_DETECTION_MAXQ
// and cpi->rc.high_source_sad = 1.
if ((cpi->oxcf.q_cfg.aq_mode == CYCLIC_REFRESH_AQ) &&
(cpi->sf.rt_sf.overshoot_detection_cbr == FAST_DETECTION_MAXQ) &&
cpi->rc.high_source_sad &&
(cpi->cyclic_refresh->counter_encode_maxq_scene_change == 0) &&
!frame_is_intra_only(cm) && !cpi->ppi->use_svc) {
cpi->rc.q_2_frame = cm->quant_params.base_qindex;
cpi->rc.q_1_frame = cm->quant_params.base_qindex;
cpi->rc.rc_2_frame = 0;
cpi->rc.rc_1_frame = 0;
return;
}
// Clear down mmx registers to allow floating point in what follows
// Work out how big we would have expected the frame to be at this Q given
// the current correction factor.
// Stay in double to avoid int overflow when values are large
if (cyclic_refresh_active) {
projected_size_based_on_q =
av1_cyclic_refresh_estimate_bits_at_q(cpi, rate_correction_factor);
}
else {
projected_size_based_on_q = av1_estimate_bits_at_q(
cpi, cm->quant_params.base_qindex, rate_correction_factor);
}
// Work out a size correction factor.
if (projected_size_based_on_q > FRAME_OVERHEAD_BITS)
correction_factor = (
double)cpi->rc.projected_frame_size /
(
double)projected_size_based_on_q;
// Clamp correction factor to prevent anything too extreme
correction_factor = AOMMAX(correction_factor, 0.25);
cpi->rc.q_2_frame = cpi->rc.q_1_frame;
cpi->rc.q_1_frame = cm->quant_params.base_qindex;
cpi->rc.rc_2_frame = cpi->rc.rc_1_frame;
if (correction_factor > 1.1)
cpi->rc.rc_1_frame = -1;
else if (correction_factor < 0.9)
cpi->rc.rc_1_frame = 1;
else
cpi->rc.rc_1_frame = 0;
// Decide how heavily to dampen the adjustment
if (correction_factor > 0.0) {
if (cpi->is_screen_content_type) {
adjustment_limit =
0.25 + 0.5 * AOMMIN(0.5, fabs(log10(correction_factor)));
}
else {
adjustment_limit =
0.25 + 0.75 * AOMMIN(0.5, fabs(log10(correction_factor)));
}
}
else {
adjustment_limit = 0.75;
}
// Adjustment to delta Q and number of blocks updated in cyclic refresh
// based on over or under shoot of target in current frame.
if (cyclic_refresh_active && cpi->rc.this_frame_target > 0) {
CYCLIC_REFRESH *
const cr = cpi->cyclic_refresh;
if (correction_factor > 1.25) {
cr->percent_refresh_adjustment =
AOMMAX(cr->percent_refresh_adjustment - 1, -5);
cr->rate_ratio_qdelta_adjustment =
AOMMAX(cr->rate_ratio_qdelta_adjustment - 0.05, -0.0);
}
else if (correction_factor < 0.5) {
cr->percent_refresh_adjustment =
AOMMIN(cr->percent_refresh_adjustment + 1, 5);
cr->rate_ratio_qdelta_adjustment =
AOMMIN(cr->rate_ratio_qdelta_adjustment + 0.05, 0.25);
}
}
if (correction_factor > 1.01) {
// We are not already at the worst allowable quality
correction_factor = (1.0 + ((correction_factor - 1.0) * adjustment_limit));
rate_correction_factor = rate_correction_factor * correction_factor;
// Keep rate_correction_factor within limits
if (rate_correction_factor > MAX_BPB_FACTOR)
rate_correction_factor = MAX_BPB_FACTOR;
}
else if (correction_factor < 0.99) {
// We are not already at the best allowable quality
correction_factor = 1.0 / correction_factor;
correction_factor = (1.0 + ((correction_factor - 1.0) * adjustment_limit));
correction_factor = 1.0 / correction_factor;
rate_correction_factor = rate_correction_factor * correction_factor;
// Keep rate_correction_factor within limits
if (rate_correction_factor < MIN_BPB_FACTOR)
rate_correction_factor = MIN_BPB_FACTOR;
}
set_rate_correction_factor(cpi, is_encode_stage, rate_correction_factor,
width, height);
}
// Calculate rate for the given 'q'.
static int get_bits_per_mb(
const AV1_COMP *cpi,
int use_cyclic_refresh,
double correction_factor,
int q) {
const AV1_COMMON *
const cm = &cpi->common;
return use_cyclic_refresh
? av1_cyclic_refresh_rc_bits_per_mb(cpi, q, correction_factor)
: av1_rc_bits_per_mb(cpi, cm->current_frame.frame_type, q,
correction_factor,
cpi->sf.hl_sf.accurate_bit_estimate);
}
/*!\brief Searches for a Q index value predicted to give an average macro
* block rate closest to the target value.
*
* Similar to find_qindex_by_rate() function, but returns a q index with a
* rate just above or below the desired rate, depending on which of the two
* rates is closer to the desired rate.
* Also, respects the selected aq_mode when computing the rate.
*
* \ingroup rate_control
* \param[in] desired_bits_per_mb Target bits per mb
* \param[in] cpi Top level encoder instance structure
* \param[in] correction_factor Current Q to rate correction factor
* \param[in] best_qindex Min allowed Q value.
* \param[in] worst_qindex Max allowed Q value.
*
* \return Returns a correction factor for the current frame
*/
static int find_closest_qindex_by_rate(
int desired_bits_per_mb,
const AV1_COMP *cpi,
double correction_factor,
int best_qindex,
int worst_qindex) {
const int use_cyclic_refresh = cpi->oxcf.q_cfg.aq_mode == CYCLIC_REFRESH_AQ &&
cpi->cyclic_refresh->apply_cyclic_refresh;
// Find 'qindex' based on 'desired_bits_per_mb'.
assert(best_qindex <= worst_qindex);
int low = best_qindex;
int high = worst_qindex;
while (low < high) {
const int mid = (low + high) >> 1;
const int mid_bits_per_mb =
get_bits_per_mb(cpi, use_cyclic_refresh, correction_factor, mid);
if (mid_bits_per_mb > desired_bits_per_mb) {
low = mid + 1;
}
else {
high = mid;
}
}
assert(low == high);
// Calculate rate difference of this q index from the desired rate.
const int curr_q = low;
const int curr_bits_per_mb =
get_bits_per_mb(cpi, use_cyclic_refresh, correction_factor, curr_q);
const int curr_bit_diff = (curr_bits_per_mb <= desired_bits_per_mb)
? desired_bits_per_mb - curr_bits_per_mb
: INT_MAX;
assert((curr_bit_diff != INT_MAX && curr_bit_diff >= 0) ||
curr_q == worst_qindex);
// Calculate rate difference for previous q index too.
const int prev_q = curr_q - 1;
int prev_bit_diff;
if (curr_bit_diff == INT_MAX || curr_q == best_qindex) {
prev_bit_diff = INT_MAX;
}
else {
const int prev_bits_per_mb =
get_bits_per_mb(cpi, use_cyclic_refresh, correction_factor, prev_q);
assert(prev_bits_per_mb > desired_bits_per_mb);
prev_bit_diff = prev_bits_per_mb - desired_bits_per_mb;
}
// Pick one of the two q indices, depending on which one has rate closer to
// the desired rate.
return (curr_bit_diff <= prev_bit_diff) ? curr_q : prev_q;
}
int av1_rc_regulate_q(
const AV1_COMP *cpi,
int target_bits_per_frame,
int active_best_quality,
int active_worst_quality,
int width,
int height) {
const int MBs = av1_get_MBs(width, height);
const double correction_factor =
get_rate_correction_factor(cpi, width, height);
const int target_bits_per_mb =
(
int)(((uint64_t)target_bits_per_frame << BPER_MB_NORMBITS) / MBs);
int q =
find_closest_qindex_by_rate(target_bits_per_mb, cpi, correction_factor,
active_best_quality, active_worst_quality);
if (cpi->oxcf.rc_cfg.mode == AOM_CBR && has_no_stats_stage(cpi))
return adjust_q_cbr(cpi, q, active_worst_quality, width, height);
return q;
}
static int get_active_quality(
int q,
int gfu_boost,
int low,
int high,
int *low_motion_minq,
int *high_motion_minq) {
if (gfu_boost > high) {
return low_motion_minq[q];
}
else if (gfu_boost < low) {
return high_motion_minq[q];
}
else {
const int gap = high - low;
const int offset = high - gfu_boost;
const int qdiff = high_motion_minq[q] - low_motion_minq[q];
const int adjustment = ((offset * qdiff) + (gap >> 1)) / gap;
return low_motion_minq[q] + adjustment;
}
}
static int get_kf_active_quality(
const PRIMARY_RATE_CONTROL *
const p_rc,
int q,
aom_bit_depth_t bit_depth) {
int *kf_low_motion_minq;
int *kf_high_motion_minq;
ASSIGN_MINQ_TABLE(bit_depth, kf_low_motion_minq);
ASSIGN_MINQ_TABLE(bit_depth, kf_high_motion_minq);
return get_active_quality(q, p_rc->kf_boost, kf_low, kf_high,
kf_low_motion_minq, kf_high_motion_minq);
}
static int get_gf_active_quality_no_rc(
int gfu_boost,
int q,
aom_bit_depth_t bit_depth) {
int *arfgf_low_motion_minq;
int *arfgf_high_motion_minq;
ASSIGN_MINQ_TABLE(bit_depth, arfgf_low_motion_minq);
ASSIGN_MINQ_TABLE(bit_depth, arfgf_high_motion_minq);
return get_active_quality(q, gfu_boost, gf_low, gf_high,
arfgf_low_motion_minq, arfgf_high_motion_minq);
}
static int get_gf_active_quality(
const PRIMARY_RATE_CONTROL *
const p_rc,
int q,
aom_bit_depth_t bit_depth) {
return get_gf_active_quality_no_rc(p_rc->gfu_boost, q, bit_depth);
}
static int get_gf_high_motion_quality(
int q, aom_bit_depth_t bit_depth) {
int *arfgf_high_motion_minq;
ASSIGN_MINQ_TABLE(bit_depth, arfgf_high_motion_minq);
return arfgf_high_motion_minq[q];
}
static int calc_active_worst_quality_no_stats_vbr(
const AV1_COMP *cpi) {
const RATE_CONTROL *
const rc = &cpi->rc;
const PRIMARY_RATE_CONTROL *
const p_rc = &cpi->ppi->p_rc;
const RefreshFrameInfo *
const refresh_frame = &cpi->refresh_frame;
const unsigned int curr_frame = cpi->common.current_frame.frame_number;
int active_worst_quality;
int last_q_key_frame;
int last_q_inter_frame;
#if CONFIG_FPMT_TEST
const int simulate_parallel_frame =
cpi->ppi->gf_group.frame_parallel_level[cpi->gf_frame_index] > 0 &&
cpi->ppi->fpmt_unit_test_cfg == PARALLEL_SIMULATION_ENCODE;
last_q_key_frame = simulate_parallel_frame ? p_rc->temp_last_q[KEY_FRAME]
: p_rc->last_q[KEY_FRAME];
last_q_inter_frame = simulate_parallel_frame ? p_rc->temp_last_q[INTER_FRAME]
: p_rc->last_q[INTER_FRAME];
#else
last_q_key_frame = p_rc->last_q[KEY_FRAME];
last_q_inter_frame = p_rc->last_q[INTER_FRAME];
#endif
if (cpi->common.current_frame.frame_type == KEY_FRAME) {
active_worst_quality =
curr_frame == 0 ? rc->worst_quality : last_q_key_frame * 2;
}
else {
if (!rc->is_src_frame_alt_ref &&
(refresh_frame->golden_frame || refresh_frame->bwd_ref_frame ||
refresh_frame->alt_ref_frame)) {
active_worst_quality =
curr_frame == 1 ? last_q_key_frame * 5 / 4 : last_q_inter_frame;
}
else {
active_worst_quality =
curr_frame == 1 ? last_q_key_frame * 2 : last_q_inter_frame * 2;
}
}
return AOMMIN(active_worst_quality, rc->worst_quality);
}
// Adjust active_worst_quality level based on buffer level.
static int calc_active_worst_quality_no_stats_cbr(
const AV1_COMP *cpi) {
// Adjust active_worst_quality: If buffer is above the optimal/target level,
// bring active_worst_quality down depending on fullness of buffer.
// If buffer is below the optimal level, let the active_worst_quality go from
// ambient Q (at buffer = optimal level) to worst_quality level
// (at buffer = critical level).
const AV1_COMMON *
const cm = &cpi->common;
const RATE_CONTROL *rc = &cpi->rc;
const PRIMARY_RATE_CONTROL *p_rc = &cpi->ppi->p_rc;
const SVC *
const svc = &cpi->svc;
unsigned int num_frames_weight_key = 5 * cpi->svc.number_temporal_layers;
// Buffer level below which we push active_worst to worst_quality.
int64_t critical_level = p_rc->optimal_buffer_level >> 3;
int64_t buff_lvl_step = 0;
int adjustment = 0;
int active_worst_quality;
int ambient_qp;
if (frame_is_intra_only(cm))
return rc->worst_quality;
// For ambient_qp we use minimum of avg_frame_qindex[KEY_FRAME/INTER_FRAME]
// for the first few frames following key frame. These are both initialized
// to worst_quality and updated with (3/4, 1/4) average in postencode_update.
// So for first few frames following key, the qp of that key frame is weighted
// into the active_worst_quality setting. For SVC the key frame should
// correspond to layer (0, 0), so use that for layer context.
int avg_qindex_key = p_rc->avg_frame_qindex[KEY_FRAME];
if (svc->number_temporal_layers > 1) {
int layer = LAYER_IDS_TO_IDX(0, 0, svc->number_temporal_layers);
const LAYER_CONTEXT *lc = &svc->layer_context[layer];
const PRIMARY_RATE_CONTROL *
const lp_rc = &lc->p_rc;
avg_qindex_key =
AOMMIN(lp_rc->avg_frame_qindex[KEY_FRAME], lp_rc->last_q[KEY_FRAME]);
}
if (svc->temporal_layer_id > 0 &&
rc->frames_since_key < 2 * svc->number_temporal_layers) {
ambient_qp = avg_qindex_key;
}
else {
ambient_qp =
(cm->current_frame.frame_number < num_frames_weight_key)
? AOMMIN(p_rc->avg_frame_qindex[INTER_FRAME], avg_qindex_key)
: p_rc->avg_frame_qindex[INTER_FRAME];
}
ambient_qp = AOMMIN(rc->worst_quality, ambient_qp);
if (p_rc->buffer_level > p_rc->optimal_buffer_level) {
// Adjust down.
int max_adjustment_down;
// Maximum adjustment down for Q
if (cpi->oxcf.q_cfg.aq_mode == CYCLIC_REFRESH_AQ && !cpi->ppi->use_svc &&
(cpi->oxcf.tune_cfg.content == AOM_CONTENT_SCREEN)) {
active_worst_quality = AOMMIN(rc->worst_quality, ambient_qp);
max_adjustment_down = AOMMIN(4, active_worst_quality / 16);
}
else {
active_worst_quality = AOMMIN(rc->worst_quality, ambient_qp * 5 / 4);
max_adjustment_down = active_worst_quality / 3;
}
if (max_adjustment_down) {
buff_lvl_step =
((p_rc->maximum_buffer_size - p_rc->optimal_buffer_level) /
max_adjustment_down);
if (buff_lvl_step)
adjustment = (
int)((p_rc->buffer_level - p_rc->optimal_buffer_level) /
buff_lvl_step);
active_worst_quality -= adjustment;
}
}
else if (p_rc->buffer_level > critical_level) {
// Adjust up from ambient Q.
active_worst_quality = AOMMIN(rc->worst_quality, ambient_qp);
if (critical_level) {
buff_lvl_step = (p_rc->optimal_buffer_level - critical_level);
if (buff_lvl_step) {
adjustment = (
int)((rc->worst_quality - ambient_qp) *
(p_rc->optimal_buffer_level - p_rc->buffer_level) /
buff_lvl_step);
}
active_worst_quality += adjustment;
}
}
else {
// Set to worst_quality if buffer is below critical level.
active_worst_quality = rc->worst_quality;
}
return active_worst_quality;
}
// Calculate the active_best_quality level.
static int calc_active_best_quality_no_stats_cbr(
const AV1_COMP *cpi,
int active_worst_quality,
int width,
int height) {
const AV1_COMMON *
const cm = &cpi->common;
const RATE_CONTROL *
const rc = &cpi->rc;
const PRIMARY_RATE_CONTROL *
const p_rc = &cpi->ppi->p_rc;
const RefreshFrameInfo *
const refresh_frame = &cpi->refresh_frame;
const CurrentFrame *
const current_frame = &cm->current_frame;
int *rtc_minq;
const int bit_depth = cm->seq_params->bit_depth;
int active_best_quality = rc->best_quality;
ASSIGN_MINQ_TABLE(bit_depth, rtc_minq);
if (frame_is_intra_only(cm)) {
// Handle the special case for key frames forced when we have reached
// the maximum key frame interval. Here force the Q to a range
// based on the ambient Q to reduce the risk of popping.
if (p_rc->this_key_frame_forced) {
int qindex = p_rc->last_boosted_qindex;
double last_boosted_q = av1_convert_qindex_to_q(qindex, bit_depth);
int delta_qindex = av1_compute_qdelta(rc, last_boosted_q,
(last_boosted_q * 0.75), bit_depth);
active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality);
}
else if (current_frame->frame_number > 0) {
// not first frame of one pass and kf_boost is set
double q_adj_factor = 1.0;
double q_val;
active_best_quality = get_kf_active_quality(
p_rc, p_rc->avg_frame_qindex[KEY_FRAME], bit_depth);
// Allow somewhat lower kf minq with small image formats.
if ((width * height) <= (352 * 288)) {
q_adj_factor -= 0.25;
}
// Convert the adjustment factor to a qindex delta
// on active_best_quality.
q_val = av1_convert_qindex_to_q(active_best_quality, bit_depth);
active_best_quality +=
av1_compute_qdelta(rc, q_val, q_val * q_adj_factor, bit_depth);
}
}
else if (!rc->is_src_frame_alt_ref && !cpi->ppi->use_svc &&
cpi->oxcf.rc_cfg.gf_cbr_boost_pct &&
(refresh_frame->golden_frame || refresh_frame->alt_ref_frame)) {
// Use the lower of active_worst_quality and recent
// average Q as basis for GF/ARF best Q limit unless last frame was
// a key frame.
int q = active_worst_quality;
if (rc->frames_since_key > 1 &&
p_rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
q = p_rc->avg_frame_qindex[INTER_FRAME];
}
active_best_quality = get_gf_active_quality(p_rc, q, bit_depth);
}
else {
// Use the lower of active_worst_quality and recent/average Q.
FRAME_TYPE frame_type =
(current_frame->frame_number > 1) ? INTER_FRAME : KEY_FRAME;
if (p_rc->avg_frame_qindex[frame_type] < active_worst_quality)
active_best_quality = rtc_minq[p_rc->avg_frame_qindex[frame_type]];
else
active_best_quality = rtc_minq[active_worst_quality];
}
return active_best_quality;
}
#if RT_PASSIVE_STRATEGY
static int get_q_passive_strategy(
const AV1_COMP *
const cpi,
const int q_candidate,
const int threshold) {
const AV1_COMMON *
const cm = &cpi->common;
const PRIMARY_RATE_CONTROL *
const p_rc = &cpi->ppi->p_rc;
const CurrentFrame *
const current_frame = &cm->current_frame;
int sum = 0;
int count = 0;
int i = 1;
while (i < MAX_Q_HISTORY) {
int frame_id = current_frame->frame_number - i;
if (frame_id <= 0)
break;
sum += p_rc->q_history[frame_id % MAX_Q_HISTORY];
++count;
++i;
}
if (count > 0) {
const int avg_q = sum / count;
if (abs(avg_q - q_candidate) <= threshold)
return avg_q;
}
return q_candidate;
}
#endif // RT_PASSIVE_STRATEGY
/*!\brief Picks q and q bounds given CBR rate control parameters in \c cpi->rc.
*
* Handles the special case when using:
* - Constant bit-rate mode: \c cpi->oxcf.rc_cfg.mode == \ref AOM_CBR, and
* - 1-pass encoding without LAP (look-ahead processing), so 1st pass stats are
* NOT available.
*
* \ingroup rate_control
* \param[in] cpi Top level encoder structure
* \param[in] width Coded frame width
* \param[in] height Coded frame height
* \param[out] bottom_index Bottom bound for q index (best quality)
* \param[out] top_index Top bound for q index (worst quality)
* \return Returns selected q index to be used for encoding this frame.
*/
static int rc_pick_q_and_bounds_no_stats_cbr(
const AV1_COMP *cpi,
int width,
int height,
int *bottom_index,
int *top_index) {
const AV1_COMMON *
const cm = &cpi->common;
const RATE_CONTROL *
const rc = &cpi->rc;
const PRIMARY_RATE_CONTROL *
const p_rc = &cpi->ppi->p_rc;
const CurrentFrame *
const current_frame = &cm->current_frame;
int q;
int active_worst_quality = calc_active_worst_quality_no_stats_cbr(cpi);
int active_best_quality = calc_active_best_quality_no_stats_cbr(
cpi, active_worst_quality, width, height);
assert(has_no_stats_stage(cpi));
assert(cpi->oxcf.rc_cfg.mode == AOM_CBR);
// Clip the active best and worst quality values to limits
active_best_quality =
clamp(active_best_quality, rc->best_quality, rc->worst_quality);
active_worst_quality =
clamp(active_worst_quality, active_best_quality, rc->worst_quality);
*top_index = active_worst_quality;
*bottom_index = active_best_quality;
// Limit Q range for the adaptive loop.
if (current_frame->frame_type == KEY_FRAME && !p_rc->this_key_frame_forced &&
current_frame->frame_number != 0) {
int qdelta = 0;
qdelta = av1_compute_qdelta_by_rate(cpi, current_frame->frame_type,
active_worst_quality, 2.0);
*top_index = active_worst_quality + qdelta;
*top_index = AOMMAX(*top_index, *bottom_index);
}
q = av1_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality,
active_worst_quality, width, height);
#if RT_PASSIVE_STRATEGY
if (current_frame->frame_type != KEY_FRAME &&
cpi->oxcf.tune_cfg.content == AOM_CONTENT_SCREEN) {
q = get_q_passive_strategy(cpi, q, 50);
}
#endif // RT_PASSIVE_STRATEGY
if (q > *top_index) {
// Special case when we are targeting the max allowed rate
if (rc->this_frame_target >= rc->max_frame_bandwidth)
*top_index = q;
else
q = *top_index;
}
assert(*top_index <= rc->worst_quality && *top_index >= rc->best_quality);
assert(*bottom_index <= rc->worst_quality &&
*bottom_index >= rc->best_quality);
assert(q <= rc->worst_quality && q >= rc->best_quality);
return q;
}
static int gf_group_pyramid_level(
const GF_GROUP *gf_group,
int gf_index) {
return gf_group->layer_depth[gf_index];
}
static int get_active_cq_level(
const RATE_CONTROL *rc,
const PRIMARY_RATE_CONTROL *p_rc,
const AV1EncoderConfig *
const oxcf,
int intra_only, aom_superres_mode superres_mode,
int superres_denom) {
const RateControlCfg *
const rc_cfg = &oxcf->rc_cfg;
static const double cq_adjust_threshold = 0.1;
int active_cq_level = rc_cfg->cq_level;
if (rc_cfg->mode == AOM_CQ || rc_cfg->mode == AOM_Q) {
// printf("Superres %d %d %d = %d\n", superres_denom, intra_only,
// rc->frames_to_key, !(intra_only && rc->frames_to_key <= 1));
if ((superres_mode == AOM_SUPERRES_QTHRESH ||
superres_mode == AOM_SUPERRES_AUTO) &&
superres_denom != SCALE_NUMERATOR) {
int mult = SUPERRES_QADJ_PER_DENOM_KEYFRAME_SOLO;
if (intra_only && rc->frames_to_key <= 1) {
mult = 0;
}
else if (intra_only) {
mult = SUPERRES_QADJ_PER_DENOM_KEYFRAME;
}
else {
mult = SUPERRES_QADJ_PER_DENOM_ARFFRAME;
}
active_cq_level = AOMMAX(
active_cq_level - ((superres_denom - SCALE_NUMERATOR) * mult), 0);
}
}
if (rc_cfg->mode == AOM_CQ && p_rc->total_target_bits > 0) {
const double x = (
double)p_rc->total_actual_bits / p_rc->total_target_bits;
if (x < cq_adjust_threshold) {
active_cq_level = (
int)(active_cq_level * x / cq_adjust_threshold);
}
}
return active_cq_level;
}
/*!\brief Picks q and q bounds given non-CBR rate control params in \c cpi->rc.
*
* Handles the special case when using:
* - Any rate control other than constant bit-rate mode:
* \c cpi->oxcf.rc_cfg.mode != \ref AOM_CBR, and
* - 1-pass encoding without LAP (look-ahead processing), so 1st pass stats are
* NOT available.
*
* \ingroup rate_control
* \param[in] cpi Top level encoder structure
* \param[in] width Coded frame width
* \param[in] height Coded frame height
* \param[out] bottom_index Bottom bound for q index (best quality)
* \param[out] top_index Top bound for q index (worst quality)
* \return Returns selected q index to be used for encoding this frame.
*/
static int rc_pick_q_and_bounds_no_stats(
const AV1_COMP *cpi,
int width,
int height,
int *bottom_index,
int *top_index) {
const AV1_COMMON *
const cm = &cpi->common;
const RATE_CONTROL *
const rc = &cpi->rc;
const PRIMARY_RATE_CONTROL *
const p_rc = &cpi->ppi->p_rc;
const CurrentFrame *
const current_frame = &cm->current_frame;
const AV1EncoderConfig *
const oxcf = &cpi->oxcf;
const RefreshFrameInfo *
const refresh_frame = &cpi->refresh_frame;
const enum aom_rc_mode rc_mode = oxcf->rc_cfg.mode;
assert(has_no_stats_stage(cpi));
assert(rc_mode == AOM_VBR ||
(!USE_UNRESTRICTED_Q_IN_CQ_MODE && rc_mode == AOM_CQ) ||
rc_mode == AOM_Q);
const int cq_level =
get_active_cq_level(rc, p_rc, oxcf, frame_is_intra_only(cm),
cpi->superres_mode, cm->superres_scale_denominator);
const int bit_depth = cm->seq_params->bit_depth;
int active_best_quality;
int active_worst_quality = calc_active_worst_quality_no_stats_vbr(cpi);
int q;
int *inter_minq;
ASSIGN_MINQ_TABLE(bit_depth, inter_minq);
if (frame_is_intra_only(cm)) {
if (rc_mode == AOM_Q) {
const int qindex = cq_level;
const double q_val = av1_convert_qindex_to_q(qindex, bit_depth);
const int delta_qindex =
av1_compute_qdelta(rc, q_val, q_val * 0.25, bit_depth);
active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality);
}
else if (p_rc->this_key_frame_forced) {
#if CONFIG_FPMT_TEST
const int simulate_parallel_frame =
cpi->ppi->gf_group.frame_parallel_level[cpi->gf_frame_index] > 0 &&
cpi->ppi->fpmt_unit_test_cfg == PARALLEL_SIMULATION_ENCODE;
int qindex = simulate_parallel_frame ? p_rc->temp_last_boosted_qindex
: p_rc->last_boosted_qindex;
#else
int qindex = p_rc->last_boosted_qindex;
#endif
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