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f883b42cabd100e575becdfb8f361f953942fe02
vpx/av1/encoder/ratectrl.c
Yaowu Xu f883b42cab Port renaming changes from AOMedia 
Cherry-Picked the following commits:
0defd8f Changed "WebM" to "AOMedia" & "webm" to "aomedia"
54e6676 Replace "VPx" by "AVx"
5082a36 Change "Vpx" to "Avx"
7df44f1 Replace "Vp9" w/ "Av1"
967f722 Remove kVp9CodecId
828f30c Change "Vp8" to "AOM"
030b5ff AUTHORS regenerated
2524cae Add ref-mv experimental flag
016762b Change copyright notice to AOMedia form
81e5526 Replace vp9 w/ av1
9b94565 Add missing files
fa8ca9f Change "vp9" to "av1"
ec838b7  Convert "vp8" to "aom"
80edfa0 Change "VP9" to "AV1"
d1a11fb Change "vp8" to "aom"
7b58251 Point to WebM test data
dd1a5c8 Replace "VP8" with "AOM"
ff00fc0 Change "VPX" to "AOM"
01dee0b Change "vp10" to "av1" in source code
cebe6f0 Convert "vpx" to "aom"
17b0567 rename vp10*.mk to av1_*.mk
fe5f8a8 rename files vp10_* to av1_*

Change-Id: I6fc3d18eb11fc171e46140c836ad5339cf6c9419
2016-08-31 18:19:03 -07:00

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/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <assert.h>
#include <limits.h>
#include <math.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/system_state.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/ratectrl.h"
// 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 DEFAULT_KF_BOOST 2000
#define DEFAULT_GF_BOOST 2000
#define MIN_BPB_FACTOR 0.005
#define MAX_BPB_FACTOR 50
#define FRAME_OVERHEAD_BITS 200
#if CONFIG_AOM_HIGHBITDEPTH
#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)
#else
#define ASSIGN_MINQ_TABLE(bit_depth, name) \
do { \
(void) bit_depth; \
name = name##_8; \
} while (0)
#endif
// 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];
#if CONFIG_AOM_HIGHBITDEPTH
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];
#endif
static int gf_high = 2000;
static int gf_low = 400;
static int kf_high = 5000;
static int kf_low = 400;
// 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) {
int i;
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;
for (i = 0; i < QINDEX_RANGE; i++) {
if (minqtarget <= av1_convert_qindex_to_q(i, bit_depth)) return i;
}
return 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, 0.55, 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);
}
}
void av1_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);
#if CONFIG_AOM_HIGHBITDEPTH
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);
#endif
}
// 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)
#if CONFIG_AOM_HIGHBITDEPTH
switch (bit_depth) {
case AOM_BITS_8: return av1_ac_quant(qindex, 0, bit_depth) / 4.0;
case AOM_BITS_10: return av1_ac_quant(qindex, 0, bit_depth) / 16.0;
case AOM_BITS_12: return av1_ac_quant(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;
}
#else
return av1_ac_quant(qindex, 0, bit_depth) / 4.0;
#endif
}
int av1_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex,
double correction_factor, aom_bit_depth_t bit_depth) {
const double q = av1_convert_qindex_to_q(qindex, bit_depth);
int enumerator = frame_type == KEY_FRAME ? 2700000 : 1800000;
assert(correction_factor <= MAX_BPB_FACTOR &&
correction_factor >= MIN_BPB_FACTOR);
// q based adjustment to baseline enumerator
enumerator += (int)(enumerator * q) >> 12;
return (int)(enumerator * correction_factor / q);
}
int av1_estimate_bits_at_q(FRAME_TYPE frame_type, int q, int mbs,
double correction_factor,
aom_bit_depth_t bit_depth) {
const int bpm =
(int)(av1_rc_bits_per_mb(frame_type, q, correction_factor, bit_depth));
return AOMMAX(FRAME_OVERHEAD_BITS,
(int)((uint64_t)bpm * mbs) >> BPER_MB_NORMBITS);
}
int av1_rc_clamp_pframe_target_size(const AV1_COMP *const cpi, int target) {
const RATE_CONTROL *rc = &cpi->rc;
const AV1EncoderConfig *oxcf = &cpi->oxcf;
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 CONFIG_EXT_REFS
if (cpi->rc.is_src_frame_alt_ref) {
#else
if (cpi->refresh_golden_frame && rc->is_src_frame_alt_ref) {
#endif
// 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 (oxcf->rc_max_inter_bitrate_pct) {
const int max_rate =
rc->avg_frame_bandwidth * oxcf->rc_max_inter_bitrate_pct / 100;
target = AOMMIN(target, max_rate);
}
return target;
}
int av1_rc_clamp_iframe_target_size(const AV1_COMP *const cpi, int target) {
const RATE_CONTROL *rc = &cpi->rc;
const AV1EncoderConfig *oxcf = &cpi->oxcf;
if (oxcf->rc_max_intra_bitrate_pct) {
const int max_rate =
rc->avg_frame_bandwidth * oxcf->rc_max_intra_bitrate_pct / 100;
target = AOMMIN(target, max_rate);
}
if (target > rc->max_frame_bandwidth) target = rc->max_frame_bandwidth;
return 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;
// Non-viewable frames are a special case and are treated as pure overhead.
#if CONFIG_EXT_REFS
// TODO(zoeliu): To further explore whether we should treat BWDREF_FRAME
// differently, since it is a no-show frame.
if (!cm->show_frame && !rc->is_bwd_ref_frame)
#else
if (!cm->show_frame)
#endif // CONFIG_EXT_REFS
rc->bits_off_target -= encoded_frame_size;
else
rc->bits_off_target += rc->avg_frame_bandwidth - encoded_frame_size;
// Clip the buffer level to the maximum specified buffer size.
rc->bits_off_target = AOMMIN(rc->bits_off_target, rc->maximum_buffer_size);
rc->buffer_level = rc->bits_off_target;
}
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 = 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
}
int av1_rc_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
return AOMMAX(interval, min_gf_interval);
}
void av1_rc_init(const AV1EncoderConfig *oxcf, int pass, RATE_CONTROL *rc) {
int i;
if (pass == 0 && oxcf->rc_mode == AOM_CBR) {
rc->avg_frame_qindex[KEY_FRAME] = oxcf->worst_allowed_q;
rc->avg_frame_qindex[INTER_FRAME] = oxcf->worst_allowed_q;
} else {
rc->avg_frame_qindex[KEY_FRAME] =
(oxcf->worst_allowed_q + oxcf->best_allowed_q) / 2;
rc->avg_frame_qindex[INTER_FRAME] =
(oxcf->worst_allowed_q + oxcf->best_allowed_q) / 2;
}
rc->last_q[KEY_FRAME] = oxcf->best_allowed_q;
rc->last_q[INTER_FRAME] = oxcf->worst_allowed_q;
rc->buffer_level = rc->starting_buffer_level;
rc->bits_off_target = rc->starting_buffer_level;
rc->rolling_target_bits = rc->avg_frame_bandwidth;
rc->rolling_actual_bits = rc->avg_frame_bandwidth;
rc->long_rolling_target_bits = rc->avg_frame_bandwidth;
rc->long_rolling_actual_bits = rc->avg_frame_bandwidth;
rc->total_actual_bits = 0;
rc->total_target_bits = 0;
rc->total_target_vs_actual = 0;
rc->frames_since_key = 8; // Sensible default for first frame.
rc->this_key_frame_forced = 0;
rc->next_key_frame_forced = 0;
rc->source_alt_ref_pending = 0;
rc->source_alt_ref_active = 0;
rc->frames_till_gf_update_due = 0;
rc->ni_av_qi = oxcf->worst_allowed_q;
rc->ni_tot_qi = 0;
rc->ni_frames = 0;
rc->tot_q = 0.0;
rc->avg_q = av1_convert_qindex_to_q(oxcf->worst_allowed_q, oxcf->bit_depth);
for (i = 0; i < RATE_FACTOR_LEVELS; ++i) {
rc->rate_correction_factors[i] = 1.0;
}
rc->min_gf_interval = oxcf->min_gf_interval;
rc->max_gf_interval = oxcf->max_gf_interval;
if (rc->min_gf_interval == 0)
rc->min_gf_interval = av1_rc_get_default_min_gf_interval(
oxcf->width, oxcf->height, oxcf->init_framerate);
if (rc->max_gf_interval == 0)
rc->max_gf_interval = av1_rc_get_default_max_gf_interval(
oxcf->init_framerate, rc->min_gf_interval);
rc->baseline_gf_interval = (rc->min_gf_interval + rc->max_gf_interval) / 2;
}
int av1_rc_drop_frame(AV1_COMP *cpi) {
const AV1EncoderConfig *oxcf = &cpi->oxcf;
RATE_CONTROL *const rc = &cpi->rc;
if (!oxcf->drop_frames_water_mark) {
return 0;
} else {
if (rc->buffer_level < 0) {
// Always drop if buffer is below 0.
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.
int drop_mark =
(int)(oxcf->drop_frames_water_mark * rc->optimal_buffer_level / 100);
if ((rc->buffer_level > drop_mark) && (rc->decimation_factor > 0)) {
--rc->decimation_factor;
} else if (rc->buffer_level <= drop_mark && rc->decimation_factor == 0) {
rc->decimation_factor = 1;
}
if (rc->decimation_factor > 0) {
if (rc->decimation_count > 0) {
--rc->decimation_count;
return 1;
} else {
rc->decimation_count = rc->decimation_factor;
return 0;
}
} else {
rc->decimation_count = 0;
return 0;
}
}
}
}
static double get_rate_correction_factor(const AV1_COMP *cpi) {
const RATE_CONTROL *const rc = &cpi->rc;
double rcf;
if (cpi->common.frame_type == KEY_FRAME) {
rcf = rc->rate_correction_factors[KF_STD];
} else if (cpi->oxcf.pass == 2) {
RATE_FACTOR_LEVEL rf_lvl =
cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index];
rcf = rc->rate_correction_factors[rf_lvl];
} else {
if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
!rc->is_src_frame_alt_ref &&
(cpi->oxcf.rc_mode != AOM_CBR || cpi->oxcf.gf_cbr_boost_pct > 20))
rcf = rc->rate_correction_factors[GF_ARF_STD];
else
rcf = rc->rate_correction_factors[INTER_NORMAL];
}
rcf *= rcf_mult[rc->frame_size_selector];
return fclamp(rcf, MIN_BPB_FACTOR, MAX_BPB_FACTOR);
}
static void set_rate_correction_factor(AV1_COMP *cpi, double factor) {
RATE_CONTROL *const rc = &cpi->rc;
// Normalize RCF to account for the size-dependent scaling factor.
factor /= rcf_mult[cpi->rc.frame_size_selector];
factor = fclamp(factor, MIN_BPB_FACTOR, MAX_BPB_FACTOR);
if (cpi->common.frame_type == KEY_FRAME) {
rc->rate_correction_factors[KF_STD] = factor;
} else if (cpi->oxcf.pass == 2) {
RATE_FACTOR_LEVEL rf_lvl =
cpi->twopass.gf_group.rf_level[cpi->twopass.gf_group.index];
rc->rate_correction_factors[rf_lvl] = factor;
} else {
if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
!rc->is_src_frame_alt_ref &&
(cpi->oxcf.rc_mode != AOM_CBR || cpi->oxcf.gf_cbr_boost_pct > 20))
rc->rate_correction_factors[GF_ARF_STD] = factor;
else
rc->rate_correction_factors[INTER_NORMAL] = factor;
}
}
void av1_rc_update_rate_correction_factors(AV1_COMP *cpi) {
const AV1_COMMON *const cm = &cpi->common;
int correction_factor = 100;
double rate_correction_factor = get_rate_correction_factor(cpi);
double adjustment_limit;
int projected_size_based_on_q = 0;
// Do not update the rate factors for arf overlay frames.
if (cpi->rc.is_src_frame_alt_ref) return;
// Clear down mmx registers to allow floating point in what follows
aom_clear_system_state();
// 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 (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->common.seg.enabled) {
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->common.frame_type, cm->base_qindex, cm->MBs,
rate_correction_factor, cm->bit_depth);
}
// Work out a size correction factor.
if (projected_size_based_on_q > FRAME_OVERHEAD_BITS)
correction_factor = (int)((100 * (int64_t)cpi->rc.projected_frame_size) /
projected_size_based_on_q);
// More heavily damped adjustment used if we have been oscillating either side
// of target.
adjustment_limit =
0.25 + 0.5 * AOMMIN(1, fabs(log10(0.01 * correction_factor)));
cpi->rc.q_2_frame = cpi->rc.q_1_frame;
cpi->rc.q_1_frame = cm->base_qindex;
cpi->rc.rc_2_frame = cpi->rc.rc_1_frame;
if (correction_factor > 110)
cpi->rc.rc_1_frame = -1;
else if (correction_factor < 90)
cpi->rc.rc_1_frame = 1;
else
cpi->rc.rc_1_frame = 0;
if (correction_factor > 102) {
// We are not already at the worst allowable quality
correction_factor =
(int)(100 + ((correction_factor - 100) * adjustment_limit));
rate_correction_factor = (rate_correction_factor * correction_factor) / 100;
// Keep rate_correction_factor within limits
if (rate_correction_factor > MAX_BPB_FACTOR)
rate_correction_factor = MAX_BPB_FACTOR;
} else if (correction_factor < 99) {
// We are not already at the best allowable quality
correction_factor =
(int)(100 - ((100 - correction_factor) * adjustment_limit));
rate_correction_factor = (rate_correction_factor * correction_factor) / 100;
// Keep rate_correction_factor within limits
if (rate_correction_factor < MIN_BPB_FACTOR)
rate_correction_factor = MIN_BPB_FACTOR;
}
set_rate_correction_factor(cpi, rate_correction_factor);
}
int av1_rc_regulate_q(const AV1_COMP *cpi, int target_bits_per_frame,
int active_best_quality, int active_worst_quality) {
const AV1_COMMON *const cm = &cpi->common;
int q = active_worst_quality;
int last_error = INT_MAX;
int i, target_bits_per_mb, bits_per_mb_at_this_q;
const double correction_factor = get_rate_correction_factor(cpi);
// Calculate required scaling factor based on target frame size and size of
// frame produced using previous Q.
target_bits_per_mb =
((uint64_t)target_bits_per_frame << BPER_MB_NORMBITS) / cm->MBs;
i = active_best_quality;
do {
if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled) {
bits_per_mb_at_this_q =
(int)av1_cyclic_refresh_rc_bits_per_mb(cpi, i, correction_factor);
} else {
bits_per_mb_at_this_q = (int)av1_rc_bits_per_mb(
cm->frame_type, i, correction_factor, cm->bit_depth);
}
if (bits_per_mb_at_this_q <= target_bits_per_mb) {
if ((target_bits_per_mb - bits_per_mb_at_this_q) <= last_error)
q = i;
else
q = i - 1;
break;
} else {
last_error = bits_per_mb_at_this_q - target_bits_per_mb;
}
} while (++i <= active_worst_quality);
// In CBR mode, this makes sure q is between oscillating Qs to prevent
// resonance.
if (cpi->oxcf.rc_mode == AOM_CBR &&
(cpi->rc.rc_1_frame * cpi->rc.rc_2_frame == -1) &&
cpi->rc.q_1_frame != cpi->rc.q_2_frame) {
q = clamp(q, AOMMIN(cpi->rc.q_1_frame, cpi->rc.q_2_frame),
AOMMAX(cpi->rc.q_1_frame, cpi->rc.q_2_frame));
}
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 RATE_CONTROL *const 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, rc->kf_boost, kf_low, kf_high,
kf_low_motion_minq, kf_high_motion_minq);
}
static int get_gf_active_quality(const RATE_CONTROL *const rc, 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, rc->gfu_boost, gf_low, gf_high,
arfgf_low_motion_minq, arfgf_high_motion_minq);
}
static int calc_active_worst_quality_one_pass_vbr(const AV1_COMP *cpi) {
const RATE_CONTROL *const rc = &cpi->rc;
const unsigned int curr_frame = cpi->common.current_video_frame;
int active_worst_quality;
if (cpi->common.frame_type == KEY_FRAME) {
active_worst_quality =
curr_frame == 0 ? rc->worst_quality : rc->last_q[KEY_FRAME] * 2;
} else {
if (!rc->is_src_frame_alt_ref &&
(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 5 / 4
: rc->last_q[INTER_FRAME];
} else {
active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 2
: rc->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_one_pass_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;
// Buffer level below which we push active_worst to worst_quality.
int64_t critical_level = rc->optimal_buffer_level >> 3;
int64_t buff_lvl_step = 0;
int adjustment = 0;
int active_worst_quality;
int ambient_qp;
if (cm->frame_type == KEY_FRAME) 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.
ambient_qp = (cm->current_video_frame < 5)
? AOMMIN(rc->avg_frame_qindex[INTER_FRAME],
rc->avg_frame_qindex[KEY_FRAME])
: rc->avg_frame_qindex[INTER_FRAME];
active_worst_quality = AOMMIN(rc->worst_quality, ambient_qp * 5 / 4);
if (rc->buffer_level > rc->optimal_buffer_level) {
// Adjust down.
// Maximum limit for down adjustment, ~30%.
int max_adjustment_down = active_worst_quality / 3;
if (max_adjustment_down) {
buff_lvl_step = ((rc->maximum_buffer_size - rc->optimal_buffer_level) /
max_adjustment_down);
if (buff_lvl_step)
adjustment = (int)((rc->buffer_level - rc->optimal_buffer_level) /
buff_lvl_step);
active_worst_quality -= adjustment;
}
} else if (rc->buffer_level > critical_level) {
// Adjust up from ambient Q.
if (critical_level) {
buff_lvl_step = (rc->optimal_buffer_level - critical_level);
if (buff_lvl_step) {
adjustment = (int)((rc->worst_quality - ambient_qp) *
(rc->optimal_buffer_level - rc->buffer_level) /
buff_lvl_step);
}
active_worst_quality = ambient_qp + adjustment;
}
} else {
// Set to worst_quality if buffer is below critical level.
active_worst_quality = rc->worst_quality;
}
return active_worst_quality;
}
static int rc_pick_q_and_bounds_one_pass_cbr(const AV1_COMP *cpi,
int *bottom_index,
int *top_index) {
const AV1_COMMON *const cm = &cpi->common;
const RATE_CONTROL *const rc = &cpi->rc;
int active_best_quality;
int active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi);
int q;
int *rtc_minq;
ASSIGN_MINQ_TABLE(cm->bit_depth, rtc_minq);
if (frame_is_intra_only(cm)) {
active_best_quality = rc->best_quality;
// 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 (rc->this_key_frame_forced) {
int qindex = rc->last_boosted_qindex;
double last_boosted_q = av1_convert_qindex_to_q(qindex, cm->bit_depth);
int delta_qindex = av1_compute_qdelta(
rc, last_boosted_q, (last_boosted_q * 0.75), cm->bit_depth);
active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality);
} else if (cm->current_video_frame > 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(
rc, rc->avg_frame_qindex[KEY_FRAME], cm->bit_depth);
// Allow somewhat lower kf minq with small image formats.
if ((cm->width * cm->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, cm->bit_depth);
active_best_quality +=
av1_compute_qdelta(rc, q_val, q_val * q_adj_factor, cm->bit_depth);
}
} else if (!rc->is_src_frame_alt_ref &&
(cpi->refresh_golden_frame || cpi->refresh_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.
if (rc->frames_since_key > 1 &&
rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
q = rc->avg_frame_qindex[INTER_FRAME];
} else {
q = active_worst_quality;
}
active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
} else {
// Use the lower of active_worst_quality and recent/average Q.
if (cm->current_video_frame > 1) {
if (rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality)
active_best_quality = rtc_minq[rc->avg_frame_qindex[INTER_FRAME]];
else
active_best_quality = rtc_minq[active_worst_quality];
} else {
if (rc->avg_frame_qindex[KEY_FRAME] < active_worst_quality)
active_best_quality = rtc_minq[rc->avg_frame_qindex[KEY_FRAME]];
else
active_best_quality = rtc_minq[active_worst_quality];
}
}
// 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 (cm->frame_type == KEY_FRAME && !rc->this_key_frame_forced &&
!(cm->current_video_frame == 0)) {
int qdelta = 0;
aom_clear_system_state();
qdelta = av1_compute_qdelta_by_rate(
&cpi->rc, cm->frame_type, active_worst_quality, 2.0, cm->bit_depth);
*top_index = active_worst_quality + qdelta;
*top_index = AOMMAX(*top_index, *bottom_index);
}
// Special case code to try and match quality with forced key frames
if (cm->frame_type == KEY_FRAME && rc->this_key_frame_forced) {
q = rc->last_boosted_qindex;
} else {
q = av1_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality,
active_worst_quality);
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 get_active_cq_level(const RATE_CONTROL *rc,
const AV1EncoderConfig *const oxcf) {
static const double cq_adjust_threshold = 0.1;
int active_cq_level = oxcf->cq_level;
if (oxcf->rc_mode == AOM_CQ && rc->total_target_bits > 0) {
const double x = (double)rc->total_actual_bits / rc->total_target_bits;
if (x < cq_adjust_threshold) {
active_cq_level = (int)(active_cq_level * x / cq_adjust_threshold);
}
}
return active_cq_level;
}
static int rc_pick_q_and_bounds_one_pass_vbr(const AV1_COMP *cpi,
int *bottom_index,
int *top_index) {
const AV1_COMMON *const cm = &cpi->common;
const RATE_CONTROL *const rc = &cpi->rc;
const AV1EncoderConfig *const oxcf = &cpi->oxcf;
const int cq_level = get_active_cq_level(rc, oxcf);
int active_best_quality;
int active_worst_quality = calc_active_worst_quality_one_pass_vbr(cpi);
int q;
int *inter_minq;
ASSIGN_MINQ_TABLE(cm->bit_depth, inter_minq);
if (frame_is_intra_only(cm)) {
if (oxcf->rc_mode == AOM_Q) {
int qindex = cq_level;
double q = av1_convert_qindex_to_q(qindex, cm->bit_depth);
int delta_qindex = av1_compute_qdelta(rc, q, q * 0.25, cm->bit_depth);
active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality);
} else if (rc->this_key_frame_forced) {
int qindex = rc->last_boosted_qindex;
double last_boosted_q = av1_convert_qindex_to_q(qindex, cm->bit_depth);
int delta_qindex = av1_compute_qdelta(
rc, last_boosted_q, last_boosted_q * 0.75, cm->bit_depth);
active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality);
} else {
// 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(
rc, rc->avg_frame_qindex[KEY_FRAME], cm->bit_depth);
// Allow somewhat lower kf minq with small image formats.
if ((cm->width * cm->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, cm->bit_depth);
active_best_quality +=
av1_compute_qdelta(rc, q_val, q_val * q_adj_factor, cm->bit_depth);
}
} else if (!rc->is_src_frame_alt_ref &&
(cpi->refresh_golden_frame || cpi->refresh_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.
if (rc->frames_since_key > 1 &&
rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
q = rc->avg_frame_qindex[INTER_FRAME];
} else {
q = rc->avg_frame_qindex[KEY_FRAME];
}
// For constrained quality dont allow Q less than the cq level
if (oxcf->rc_mode == AOM_CQ) {
if (q < cq_level) q = cq_level;
active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
// Constrained quality use slightly lower active best.
active_best_quality = active_best_quality * 15 / 16;
} else if (oxcf->rc_mode == AOM_Q) {
int qindex = cq_level;
double q = av1_convert_qindex_to_q(qindex, cm->bit_depth);
int delta_qindex;
if (cpi->refresh_alt_ref_frame)
delta_qindex = av1_compute_qdelta(rc, q, q * 0.40, cm->bit_depth);
else
delta_qindex = av1_compute_qdelta(rc, q, q * 0.50, cm->bit_depth);
active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality);
} else {
active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
}
} else {
if (oxcf->rc_mode == AOM_Q) {
int qindex = cq_level;
double q = av1_convert_qindex_to_q(qindex, cm->bit_depth);
double delta_rate[FIXED_GF_INTERVAL] = { 0.50, 1.0, 0.85, 1.0,
0.70, 1.0, 0.85, 1.0 };
int delta_qindex = av1_compute_qdelta(
rc, q, q * delta_rate[cm->current_video_frame % FIXED_GF_INTERVAL],
cm->bit_depth);
active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality);
} else {
// Use the lower of active_worst_quality and recent/average Q.
if (cm->current_video_frame > 1)
active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]];
else
active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]];
// For the constrained quality mode we don't want
// q to fall below the cq level.
if ((oxcf->rc_mode == AOM_CQ) && (active_best_quality < cq_level)) {
active_best_quality = cq_level;
}
}
}
// 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.
{
int qdelta = 0;
aom_clear_system_state();
if (cm->frame_type == KEY_FRAME && !rc->this_key_frame_forced &&
!(cm->current_video_frame == 0)) {
qdelta = av1_compute_qdelta_by_rate(
&cpi->rc, cm->frame_type, active_worst_quality, 2.0, cm->bit_depth);
} else if (!rc->is_src_frame_alt_ref &&
(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
qdelta = av1_compute_qdelta_by_rate(
&cpi->rc, cm->frame_type, active_worst_quality, 1.75, cm->bit_depth);
}
*top_index = active_worst_quality + qdelta;
*top_index = AOMMAX(*top_index, *bottom_index);
}
if (oxcf->rc_mode == AOM_Q) {
q = active_best_quality;
// Special case code to try and match quality with forced key frames
} else if ((cm->frame_type == KEY_FRAME) && rc->this_key_frame_forced) {
q = rc->last_boosted_qindex;
} else {
q = av1_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality,
active_worst_quality);
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;
}
int av1_frame_type_qdelta(const AV1_COMP *cpi, int rf_level, int q) {
static const double rate_factor_deltas[RATE_FACTOR_LEVELS] = {
1.00, // INTER_NORMAL
#if CONFIG_EXT_REFS
0.80, // INTER_LOW
1.50, // INTER_HIGH
1.25, // GF_ARF_LOW
#else
1.00, // INTER_HIGH
1.50, // GF_ARF_LOW
#endif // CONFIG_EXT_REFS
2.00, // GF_ARF_STD
2.00, // KF_STD
};
static const FRAME_TYPE frame_type[RATE_FACTOR_LEVELS] =
#if CONFIG_EXT_REFS
{ INTER_FRAME, INTER_FRAME, INTER_FRAME,
INTER_FRAME, INTER_FRAME, KEY_FRAME };
#else
{ INTER_FRAME, INTER_FRAME, INTER_FRAME, INTER_FRAME, KEY_FRAME };
#endif // CONFIG_EXT_REFS
const AV1_COMMON *const cm = &cpi->common;
int qdelta =
av1_compute_qdelta_by_rate(&cpi->rc, frame_type[rf_level], q,
rate_factor_deltas[rf_level], cm->bit_depth);
return qdelta;
}
#define STATIC_MOTION_THRESH 95
static int rc_pick_q_and_bounds_two_pass(const AV1_COMP *cpi, int *bottom_index,
int *top_index) {
const AV1_COMMON *const cm = &cpi->common;
const RATE_CONTROL *const rc = &cpi->rc;
const AV1EncoderConfig *const oxcf = &cpi->oxcf;
const GF_GROUP *gf_group = &cpi->twopass.gf_group;
const int cq_level = get_active_cq_level(rc, oxcf);
int active_best_quality;
int active_worst_quality = cpi->twopass.active_worst_quality;
int q;
int *inter_minq;
ASSIGN_MINQ_TABLE(cm->bit_depth, inter_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 (rc->this_key_frame_forced) {
double last_boosted_q;
int delta_qindex;
int qindex;
if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) {
qindex = AOMMIN(rc->last_kf_qindex, rc->last_boosted_qindex);
active_best_quality = qindex;
last_boosted_q = av1_convert_qindex_to_q(qindex, cm->bit_depth);
delta_qindex = av1_compute_qdelta(rc, last_boosted_q,
last_boosted_q * 1.25, cm->bit_depth);
active_worst_quality =
AOMMIN(qindex + delta_qindex, active_worst_quality);
} else {
qindex = rc->last_boosted_qindex;
last_boosted_q = av1_convert_qindex_to_q(qindex, cm->bit_depth);
delta_qindex = av1_compute_qdelta(rc, last_boosted_q,
last_boosted_q * 0.75, cm->bit_depth);
active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality);
}
} else {
// Not forced keyframe.
double q_adj_factor = 1.0;
double q_val;
// Baseline value derived from cpi->active_worst_quality and kf boost.
active_best_quality =
get_kf_active_quality(rc, active_worst_quality, cm->bit_depth);
// Allow somewhat lower kf minq with small image formats.
if ((cm->width * cm->height) <= (352 * 288)) {
q_adj_factor -= 0.25;
}
// Make a further adjustment based on the kf zero motion measure.
q_adj_factor += 0.05 - (0.001 * (double)cpi->twopass.kf_zeromotion_pct);
// Convert the adjustment factor to a qindex delta
// on active_best_quality.
q_val = av1_convert_qindex_to_q(active_best_quality, cm->bit_depth);
active_best_quality +=
av1_compute_qdelta(rc, q_val, q_val * q_adj_factor, cm->bit_depth);
}
} else if (!rc->is_src_frame_alt_ref &&
(cpi->refresh_golden_frame || cpi->refresh_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.
if (rc->frames_since_key > 1 &&
rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
q = rc->avg_frame_qindex[INTER_FRAME];
} else {
q = active_worst_quality;
}
// For constrained quality dont allow Q less than the cq level
if (oxcf->rc_mode == AOM_CQ) {
if (q < cq_level) q = cq_level;
active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
// Constrained quality use slightly lower active best.
active_best_quality = active_best_quality * 15 / 16;
} else if (oxcf->rc_mode == AOM_Q) {
if (!cpi->refresh_alt_ref_frame) {
active_best_quality = cq_level;
} else {
active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
// Modify best quality for second level arfs. For mode AOM_Q this
// becomes the baseline frame q.
if (gf_group->rf_level[gf_group->index] == GF_ARF_LOW)
active_best_quality = (active_best_quality + cq_level + 1) / 2;
}
} else {
active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
}
} else {
if (oxcf->rc_mode == AOM_Q) {
active_best_quality = cq_level;
} else {
active_best_quality = inter_minq[active_worst_quality];
// For the constrained quality mode we don't want
// q to fall below the cq level.
if ((oxcf->rc_mode == AOM_CQ) && (active_best_quality < cq_level)) {
active_best_quality = cq_level;
}
}
}
// Extension to max or min Q if undershoot or overshoot is outside
// the permitted range.
if ((cpi->oxcf.rc_mode != AOM_Q) &&
(cpi->twopass.gf_zeromotion_pct < VLOW_MOTION_THRESHOLD)) {
if (frame_is_intra_only(cm) ||
(!rc->is_src_frame_alt_ref &&
(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame))) {
active_best_quality -=
(cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast);
active_worst_quality += (cpi->twopass.extend_maxq / 2);
} else {
active_best_quality -=
(cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast) / 2;
active_worst_quality += cpi->twopass.extend_maxq;
}
}
aom_clear_system_state();
// Static forced key frames Q restrictions dealt with elsewhere.
if (!(frame_is_intra_only(cm)) || !rc->this_key_frame_forced ||
(cpi->twopass.last_kfgroup_zeromotion_pct < STATIC_MOTION_THRESH)) {
int qdelta = av1_frame_type_qdelta(cpi, gf_group->rf_level[gf_group->index],
active_worst_quality);
active_worst_quality =
AOMMAX(active_worst_quality + qdelta, active_best_quality);
}
// Modify active_best_quality for downscaled normal frames.
if (rc->frame_size_selector != UNSCALED && !frame_is_kf_gf_arf(cpi)) {
int qdelta = av1_compute_qdelta_by_rate(
rc, cm->frame_type, active_best_quality, 2.0, cm->bit_depth);
active_best_quality =
AOMMAX(active_best_quality + qdelta, rc->best_quality);
}
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);
if (oxcf->rc_mode == AOM_Q) {
q = active_best_quality;
// Special case code to try and match quality with forced key frames.
} else if (frame_is_intra_only(cm) && rc->this_key_frame_forced) {
// If static since last kf use better of last boosted and last kf q.
if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) {
q = AOMMIN(rc->last_kf_qindex, rc->last_boosted_qindex);
} else {
q = rc->last_boosted_qindex;
}
} else {
q = av1_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality,
active_worst_quality);
if (q > active_worst_quality) {
// Special case when we are targeting the max allowed rate.
if (rc->this_frame_target >= rc->max_frame_bandwidth)
active_worst_quality = q;
else
q = active_worst_quality;
}
}
clamp(q, active_best_quality, active_worst_quality);
*top_index = active_worst_quality;
*bottom_index = active_best_quality;
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;
}
int av1_rc_pick_q_and_bounds(const AV1_COMP *cpi, int *bottom_index,
int *top_index) {
int q;
if (cpi->oxcf.pass == 0) {
if (cpi->oxcf.rc_mode == AOM_CBR)
q = rc_pick_q_and_bounds_one_pass_cbr(cpi, bottom_index, top_index);
else
q = rc_pick_q_and_bounds_one_pass_vbr(cpi, bottom_index, top_index);
} else {
q = rc_pick_q_and_bounds_two_pass(cpi, bottom_index, top_index);
}
return q;
}
void av1_rc_compute_frame_size_bounds(const AV1_COMP *cpi, int frame_target,
int *frame_under_shoot_limit,
int *frame_over_shoot_limit) {
if (cpi->oxcf.rc_mode == AOM_Q) {
*frame_under_shoot_limit = 0;
*frame_over_shoot_limit = INT_MAX;
} else {
// For very small rate targets where the fractional adjustment
// may be tiny make sure there is at least a minimum range.
const int tolerance = (cpi->sf.recode_tolerance * frame_target) / 100;
*frame_under_shoot_limit = AOMMAX(frame_target - tolerance - 200, 0);
*frame_over_shoot_limit =
AOMMIN(frame_target + tolerance + 200, cpi->rc.max_frame_bandwidth);
}
}
void av1_rc_set_frame_target(AV1_COMP *cpi, int target) {
const AV1_COMMON *const cm = &cpi->common;
RATE_CONTROL *const rc = &cpi->rc;
rc->this_frame_target = target;
// Modify frame size target when down-scaling.
if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC &&
rc->frame_size_selector != UNSCALED)
rc->this_frame_target = (int)(rc->this_frame_target *
rate_thresh_mult[rc->frame_size_selector]);
// Target rate per SB64 (including partial SB64s.
rc->sb64_target_rate =
((int64_t)rc->this_frame_target * 64 * 64) / (cm->width * cm->height);
}
static void update_alt_ref_frame_stats(AV1_COMP *cpi) {
// this frame refreshes means next frames don't unless specified by user
RATE_CONTROL *const rc = &cpi->rc;
rc->frames_since_golden = 0;
// Mark the alt ref as done (setting to 0 means no further alt refs pending).
rc->source_alt_ref_pending = 0;
// Set the alternate reference frame active flag
rc->source_alt_ref_active = 1;
}
static void update_golden_frame_stats(AV1_COMP *cpi) {
RATE_CONTROL *const rc = &cpi->rc;
#if CONFIG_EXT_REFS
// Update the Golden frame usage counts.
// NOTE(weitinglin): If we use show_existing_frame for an OVERLAY frame,
// only the virtual indices for the reference frame will be
// updated and cpi->refresh_golden_frame will still be zero.
if (cpi->refresh_golden_frame || rc->is_src_frame_alt_ref) {
#else
// Update the Golden frame usage counts.
if (cpi->refresh_golden_frame) {
#endif
#if CONFIG_EXT_REFS
// We will not use internal overlay frames to replace the golden frame
if (!rc->is_src_frame_ext_arf)
#endif
// this frame refreshes means next frames don't unless specified by user
rc->frames_since_golden = 0;
// If we are not using alt ref in the up and coming group clear the arf
// active flag. In multi arf group case, if the index is not 0 then
// we are overlaying a mid group arf so should not reset the flag.
if (cpi->oxcf.pass == 2) {
if (!rc->source_alt_ref_pending && (cpi->twopass.gf_group.index == 0))
rc->source_alt_ref_active = 0;
} else if (!rc->source_alt_ref_pending) {
rc->source_alt_ref_active = 0;
}
// Decrement count down till next gf
if (rc->frames_till_gf_update_due > 0) rc->frames_till_gf_update_due--;
} else if (!cpi->refresh_alt_ref_frame) {
// Decrement count down till next gf
if (rc->frames_till_gf_update_due > 0) rc->frames_till_gf_update_due--;
rc->frames_since_golden++;
}
}
void av1_rc_postencode_update(AV1_COMP *cpi, uint64_t bytes_used) {
const AV1_COMMON *const cm = &cpi->common;
const AV1EncoderConfig *const oxcf = &cpi->oxcf;
RATE_CONTROL *const rc = &cpi->rc;
const int qindex = cm->base_qindex;
if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled) {
av1_cyclic_refresh_postencode(cpi);
}
// Update rate control heuristics
rc->projected_frame_size = (int)(bytes_used << 3);
// Post encode loop adjustment of Q prediction.
av1_rc_update_rate_correction_factors(cpi);
// Keep a record of last Q and ambient average Q.
if (cm->frame_type == KEY_FRAME) {
rc->last_q[KEY_FRAME] = qindex;
rc->avg_frame_qindex[KEY_FRAME] =
ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[KEY_FRAME] + qindex, 2);
} else {
if (!rc->is_src_frame_alt_ref &&
!(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
rc->last_q[INTER_FRAME] = qindex;
rc->avg_frame_qindex[INTER_FRAME] =
ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[INTER_FRAME] + qindex, 2);
rc->ni_frames++;
rc->tot_q += av1_convert_qindex_to_q(qindex, cm->bit_depth);
rc->avg_q = rc->tot_q / rc->ni_frames;
// Calculate the average Q for normal inter frames (not key or GFU
// frames).
rc->ni_tot_qi += qindex;
rc->ni_av_qi = rc->ni_tot_qi / rc->ni_frames;
}
}
// Keep record of last boosted (KF/GF/ARF) Q value.
// If the current frame is coded at a lower Q then we also update it.
// If all mbs in this group are skipped only update if the Q value is
// better than that already stored.
// This is used to help set quality in forced key frames to reduce popping
if ((qindex < rc->last_boosted_qindex) || (cm->frame_type == KEY_FRAME) ||
(!rc->constrained_gf_group &&
(cpi->refresh_alt_ref_frame ||
(cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) {
rc->last_boosted_qindex = qindex;
}
if (cm->frame_type == KEY_FRAME) rc->last_kf_qindex = qindex;
update_buffer_level(cpi, rc->projected_frame_size);
// Rolling monitors of whether we are over or underspending used to help
// regulate min and Max Q in two pass.
if (cm->frame_type != KEY_FRAME) {
rc->rolling_target_bits = ROUND_POWER_OF_TWO(
rc->rolling_target_bits * 3 + rc->this_frame_target, 2);
rc->rolling_actual_bits = ROUND_POWER_OF_TWO(
rc->rolling_actual_bits * 3 + rc->projected_frame_size, 2);
rc->long_rolling_target_bits = ROUND_POWER_OF_TWO(
rc->long_rolling_target_bits * 31 + rc->this_frame_target, 5);
rc->long_rolling_actual_bits = ROUND_POWER_OF_TWO(
rc->long_rolling_actual_bits * 31 + rc->projected_frame_size, 5);
}
// Actual bits spent
rc->total_actual_bits += rc->projected_frame_size;
#if CONFIG_EXT_REFS
rc->total_target_bits +=
(cm->show_frame || rc->is_bwd_ref_frame) ? rc->avg_frame_bandwidth : 0;
#else
rc->total_target_bits += cm->show_frame ? rc->avg_frame_bandwidth : 0;
#endif // CONFIG_EXT_REFS
rc->total_target_vs_actual = rc->total_actual_bits - rc->total_target_bits;
if (is_altref_enabled(cpi) && cpi->refresh_alt_ref_frame &&
(cm->frame_type != KEY_FRAME))
// Update the alternate reference frame stats as appropriate.
update_alt_ref_frame_stats(cpi);
else
// Update the Golden frame stats as appropriate.
update_golden_frame_stats(cpi);
if (cm->frame_type == KEY_FRAME) rc->frames_since_key = 0;
#if CONFIG_EXT_REFS
if (cm->show_frame || rc->is_bwd_ref_frame) {
#else
if (cm->show_frame) {
#endif // CONFIG_EXT_REFS
rc->frames_since_key++;
rc->frames_to_key--;
}
// Trigger the resizing of the next frame if it is scaled.
if (oxcf->pass != 0) {
cpi->resize_pending =
rc->next_frame_size_selector != rc->frame_size_selector;
rc->frame_size_selector = rc->next_frame_size_selector;
}
}
void av1_rc_postencode_update_drop_frame(AV1_COMP *cpi) {
// Update buffer level with zero size, update frame counters, and return.
update_buffer_level(cpi, 0);
cpi->rc.frames_since_key++;
cpi->rc.frames_to_key--;
cpi->rc.rc_2_frame = 0;
cpi->rc.rc_1_frame = 0;
}
// Use this macro to turn on/off use of alt-refs in one-pass mode.
#define USE_ALTREF_FOR_ONE_PASS 1
static int calc_pframe_target_size_one_pass_vbr(const AV1_COMP *const cpi) {
static const int af_ratio = 10;
const RATE_CONTROL *const rc = &cpi->rc;
int target;
#if USE_ALTREF_FOR_ONE_PASS
target =
(!rc->is_src_frame_alt_ref &&
(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame))
? (rc->avg_frame_bandwidth * rc->baseline_gf_interval * af_ratio) /
(rc->baseline_gf_interval + af_ratio - 1)
: (rc->avg_frame_bandwidth * rc->baseline_gf_interval) /
(rc->baseline_gf_interval + af_ratio - 1);
#else
target = rc->avg_frame_bandwidth;
#endif
return av1_rc_clamp_pframe_target_size(cpi, target);
}
static int calc_iframe_target_size_one_pass_vbr(const AV1_COMP *const cpi) {
static const int kf_ratio = 25;
const RATE_CONTROL *rc = &cpi->rc;
const int target = rc->avg_frame_bandwidth * kf_ratio;
return av1_rc_clamp_iframe_target_size(cpi, target);
}
void av1_rc_get_one_pass_vbr_params(AV1_COMP *cpi) {
AV1_COMMON *const cm = &cpi->common;
RATE_CONTROL *const rc = &cpi->rc;
int target;
// TODO(yaowu): replace the "auto_key && 0" below with proper decision logic.
if (!cpi->refresh_alt_ref_frame &&
(cm->current_video_frame == 0 || (cpi->frame_flags & FRAMEFLAGS_KEY) ||
rc->frames_to_key == 0 || (cpi->oxcf.auto_key && 0))) {
cm->frame_type = KEY_FRAME;
rc->this_key_frame_forced =
cm->current_video_frame != 0 && rc->frames_to_key == 0;
rc->frames_to_key = cpi->oxcf.key_freq;
rc->kf_boost = DEFAULT_KF_BOOST;
rc->source_alt_ref_active = 0;
} else {
cm->frame_type = INTER_FRAME;
}
if (rc->frames_till_gf_update_due == 0) {
rc->baseline_gf_interval = (rc->min_gf_interval + rc->max_gf_interval) / 2;
rc->frames_till_gf_update_due = rc->baseline_gf_interval;
// NOTE: frames_till_gf_update_due must be <= frames_to_key.
if (rc->frames_till_gf_update_due > rc->frames_to_key) {
rc->frames_till_gf_update_due = rc->frames_to_key;
rc->constrained_gf_group = 1;
} else {
rc->constrained_gf_group = 0;
}
cpi->refresh_golden_frame = 1;
rc->source_alt_ref_pending = USE_ALTREF_FOR_ONE_PASS;
rc->gfu_boost = DEFAULT_GF_BOOST;
}
if (cm->frame_type == KEY_FRAME)
target = calc_iframe_target_size_one_pass_vbr(cpi);
else
target = calc_pframe_target_size_one_pass_vbr(cpi);
av1_rc_set_frame_target(cpi, target);
}
static int calc_pframe_target_size_one_pass_cbr(const AV1_COMP *cpi) {
const AV1EncoderConfig *oxcf = &cpi->oxcf;
const RATE_CONTROL *rc = &cpi->rc;
const int64_t diff = rc->optimal_buffer_level - rc->buffer_level;
const int64_t one_pct_bits = 1 + rc->optimal_buffer_level / 100;
int min_frame_target =
AOMMAX(rc->avg_frame_bandwidth >> 4, FRAME_OVERHEAD_BITS);
int target;
if (oxcf->gf_cbr_boost_pct) {
const int af_ratio_pct = oxcf->gf_cbr_boost_pct + 100;
target = cpi->refresh_golden_frame
? (rc->avg_frame_bandwidth * rc->baseline_gf_interval *
af_ratio_pct) /
(rc->baseline_gf_interval * 100 + af_ratio_pct - 100)
: (rc->avg_frame_bandwidth * rc->baseline_gf_interval * 100) /
(rc->baseline_gf_interval * 100 + af_ratio_pct - 100);
} else {
target = rc->avg_frame_bandwidth;
}
if (diff > 0) {
// Lower the target bandwidth for this frame.
const int pct_low = (int)AOMMIN(diff / one_pct_bits, oxcf->under_shoot_pct);
target -= (target * pct_low) / 200;
} else if (diff < 0) {
// Increase the target bandwidth for this frame.
const int pct_high =
(int)AOMMIN(-diff / one_pct_bits, oxcf->over_shoot_pct);
target += (target * pct_high) / 200;
}
if (oxcf->rc_max_inter_bitrate_pct) {
const int max_rate =
rc->avg_frame_bandwidth * oxcf->rc_max_inter_bitrate_pct / 100;
target = AOMMIN(target, max_rate);
}
return AOMMAX(min_frame_target, target);
}
static int calc_iframe_target_size_one_pass_cbr(const AV1_COMP *cpi) {
const RATE_CONTROL *rc = &cpi->rc;
int target;
if (cpi->common.current_video_frame == 0) {
target = ((rc->starting_buffer_level / 2) > INT_MAX)
? INT_MAX
: (int)(rc->starting_buffer_level / 2);
} else {
int kf_boost = 32;
double framerate = cpi->framerate;
kf_boost = AOMMAX(kf_boost, (int)(2 * framerate - 16));
if (rc->frames_since_key < framerate / 2) {
kf_boost = (int)(kf_boost * rc->frames_since_key / (framerate / 2));
}
target = ((16 + kf_boost) * rc->avg_frame_bandwidth) >> 4;
}
return av1_rc_clamp_iframe_target_size(cpi, target);
}
void av1_rc_get_one_pass_cbr_params(AV1_COMP *cpi) {
AV1_COMMON *const cm = &cpi->common;
RATE_CONTROL *const rc = &cpi->rc;
int target;
// TODO(yaowu): replace the "auto_key && 0" below with proper decision logic.
if ((cm->current_video_frame == 0 || (cpi->frame_flags & FRAMEFLAGS_KEY) ||
rc->frames_to_key == 0 || (cpi->oxcf.auto_key && 0))) {
cm->frame_type = KEY_FRAME;
rc->this_key_frame_forced =
cm->current_video_frame != 0 && rc->frames_to_key == 0;
rc->frames_to_key = cpi->oxcf.key_freq;
rc->kf_boost = DEFAULT_KF_BOOST;
rc->source_alt_ref_active = 0;
} else {
cm->frame_type = INTER_FRAME;
}
if (rc->frames_till_gf_update_due == 0) {
if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
av1_cyclic_refresh_set_golden_update(cpi);
else
rc->baseline_gf_interval =
(rc->min_gf_interval + rc->max_gf_interval) / 2;
rc->frames_till_gf_update_due = rc->baseline_gf_interval;
// NOTE: frames_till_gf_update_due must be <= frames_to_key.
if (rc->frames_till_gf_update_due > rc->frames_to_key)
rc->frames_till_gf_update_due = rc->frames_to_key;
cpi->refresh_golden_frame = 1;
rc->gfu_boost = DEFAULT_GF_BOOST;
}
// Any update/change of global cyclic refresh parameters (amount/delta-qp)
// should be done here, before the frame qp is selected.
if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
av1_cyclic_refresh_update_parameters(cpi);
if (cm->frame_type == KEY_FRAME)
target = calc_iframe_target_size_one_pass_cbr(cpi);
else
target = calc_pframe_target_size_one_pass_cbr(cpi);
av1_rc_set_frame_target(cpi, target);
if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC)
cpi->resize_pending = av1_resize_one_pass_cbr(cpi);
else
cpi->resize_pending = 0;
}
int av1_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget,
aom_bit_depth_t bit_depth) {
int start_index = rc->worst_quality;
int target_index = rc->worst_quality;
int i;
// Convert the average q value to an index.
for (i = rc->best_quality; i < rc->worst_quality; ++i) {
start_index = i;
if (av1_convert_qindex_to_q(i, bit_depth) >= qstart) break;
}
// Convert the q target to an index
for (i = rc->best_quality; i < rc->worst_quality; ++i) {
target_index = i;
if (av1_convert_qindex_to_q(i, bit_depth) >= qtarget) break;
}
return target_index - start_index;
}
int av1_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type,
int qindex, double rate_target_ratio,
aom_bit_depth_t bit_depth) {
int target_index = rc->worst_quality;
int i;
// Look up the current projected bits per block for the base index
const int base_bits_per_mb =
av1_rc_bits_per_mb(frame_type, qindex, 1.0, bit_depth);
// Find the target bits per mb based on the base value and given ratio.
const int target_bits_per_mb = (int)(rate_target_ratio * base_bits_per_mb);
// Convert the q target to an index
for (i = rc->best_quality; i < rc->worst_quality; ++i) {
if (av1_rc_bits_per_mb(frame_type, i, 1.0, bit_depth) <=
target_bits_per_mb) {
target_index = i;
break;
}
}
return target_index - qindex;
}
void av1_rc_set_gf_interval_range(const AV1_COMP *const cpi,
RATE_CONTROL *const rc) {
const AV1EncoderConfig *const oxcf = &cpi->oxcf;
// Special case code for 1 pass fixed Q mode tests
if ((oxcf->pass == 0) && (oxcf->rc_mode == AOM_Q)) {
rc->max_gf_interval = FIXED_GF_INTERVAL;
rc->min_gf_interval = FIXED_GF_INTERVAL;
rc->static_scene_max_gf_interval = FIXED_GF_INTERVAL;
} else {
// Set Maximum gf/arf interval
rc->max_gf_interval = oxcf->max_gf_interval;
rc->min_gf_interval = oxcf->min_gf_interval;
if (rc->min_gf_interval == 0)
rc->min_gf_interval = av1_rc_get_default_min_gf_interval(
oxcf->width, oxcf->height, cpi->framerate);
if (rc->max_gf_interval == 0)
rc->max_gf_interval = av1_rc_get_default_max_gf_interval(
cpi->framerate, rc->min_gf_interval);
// Extended interval for genuinely static scenes
rc->static_scene_max_gf_interval = MAX_LAG_BUFFERS * 2;
if (is_altref_enabled(cpi)) {
if (rc->static_scene_max_gf_interval > oxcf->lag_in_frames - 1)
rc->static_scene_max_gf_interval = oxcf->lag_in_frames - 1;
}
if (rc->max_gf_interval > rc->static_scene_max_gf_interval)
rc->max_gf_interval = rc->static_scene_max_gf_interval;
// Clamp min to max
rc->min_gf_interval = AOMMIN(rc->min_gf_interval, rc->max_gf_interval);
}
}
void av1_rc_update_framerate(AV1_COMP *cpi) {
const AV1_COMMON *const cm = &cpi->common;
const AV1EncoderConfig *const oxcf = &cpi->oxcf;
RATE_CONTROL *const rc = &cpi->rc;
int vbr_max_bits;
rc->avg_frame_bandwidth = (int)(oxcf->target_bandwidth / cpi->framerate);
rc->min_frame_bandwidth =
(int)(rc->avg_frame_bandwidth * oxcf->two_pass_vbrmin_section / 100);
rc->min_frame_bandwidth =
AOMMAX(rc->min_frame_bandwidth, FRAME_OVERHEAD_BITS);
// A maximum bitrate for a frame is defined.
// The baseline for this aligns with HW implementations that
// can support decode of 1080P content up to a bitrate of MAX_MB_RATE bits
// per 16x16 MB (averaged over a frame). However this limit is extended if
// a very high rate is given on the command line or the the rate cannnot
// be acheived because of a user specificed max q (e.g. when the user
// specifies lossless encode.
vbr_max_bits =
(int)(((int64_t)rc->avg_frame_bandwidth * oxcf->two_pass_vbrmax_section) /
100);
rc->max_frame_bandwidth =
AOMMAX(AOMMAX((cm->MBs * MAX_MB_RATE), MAXRATE_1080P), vbr_max_bits);
av1_rc_set_gf_interval_range(cpi, rc);
}
#define VBR_PCT_ADJUSTMENT_LIMIT 50
// For VBR...adjustment to the frame target based on error from previous frames
static void vbr_rate_correction(AV1_COMP *cpi, int *this_frame_target) {
RATE_CONTROL *const rc = &cpi->rc;
int64_t vbr_bits_off_target = rc->vbr_bits_off_target;
int max_delta;
double position_factor = 1.0;
// How far through the clip are we.
// This number is used to damp the per frame rate correction.
// Range 0 - 1.0
if (cpi->twopass.total_stats.count != 0.) {
position_factor = sqrt((double)cpi->common.current_video_frame /
cpi->twopass.total_stats.count);
}
max_delta = (int)(position_factor *
((*this_frame_target * VBR_PCT_ADJUSTMENT_LIMIT) / 100));
// vbr_bits_off_target > 0 means we have extra bits to spend
if (vbr_bits_off_target > 0) {
*this_frame_target += (vbr_bits_off_target > max_delta)
? max_delta
: (int)vbr_bits_off_target;
} else {
*this_frame_target -= (vbr_bits_off_target < -max_delta)
? max_delta
: (int)-vbr_bits_off_target;
}
// Fast redistribution of bits arising from massive local undershoot.
// Dont do it for kf,arf,gf or overlay frames.
if (!frame_is_kf_gf_arf(cpi) && !rc->is_src_frame_alt_ref &&
rc->vbr_bits_off_target_fast) {
int one_frame_bits = AOMMAX(rc->avg_frame_bandwidth, *this_frame_target);
int fast_extra_bits;
fast_extra_bits = (int)AOMMIN(rc->vbr_bits_off_target_fast, one_frame_bits);
fast_extra_bits = (int)AOMMIN(
fast_extra_bits,
AOMMAX(one_frame_bits / 8, rc->vbr_bits_off_target_fast / 8));
*this_frame_target += (int)fast_extra_bits;
rc->vbr_bits_off_target_fast -= fast_extra_bits;
}
}
void av1_set_target_rate(AV1_COMP *cpi) {
RATE_CONTROL *const rc = &cpi->rc;
int target_rate = rc->base_frame_target;
// Correction to rate target based on prior over or under shoot.
if (cpi->oxcf.rc_mode == AOM_VBR || cpi->oxcf.rc_mode == AOM_CQ)
vbr_rate_correction(cpi, &target_rate);
av1_rc_set_frame_target(cpi, target_rate);
}
// Check if we should resize, based on average QP from past x frames.
// Only allow for resize at most one scale down for now, scaling factor is 2.
int av1_resize_one_pass_cbr(AV1_COMP *cpi) {
const AV1_COMMON *const cm = &cpi->common;
RATE_CONTROL *const rc = &cpi->rc;
int resize_now = 0;
cpi->resize_scale_num = 1;
cpi->resize_scale_den = 1;
// Don't resize on key frame; reset the counters on key frame.
if (cm->frame_type == KEY_FRAME) {
cpi->resize_avg_qp = 0;
cpi->resize_count = 0;
return 0;
}
// Resize based on average buffer underflow and QP over some window.
// Ignore samples close to key frame, since QP is usually high after key.
if (cpi->rc.frames_since_key > 2 * cpi->framerate) {
const int window = (int)(5 * cpi->framerate);
cpi->resize_avg_qp += cm->base_qindex;
if (cpi->rc.buffer_level < (int)(30 * rc->optimal_buffer_level / 100))
++cpi->resize_buffer_underflow;
++cpi->resize_count;
// Check for resize action every "window" frames.
if (cpi->resize_count >= window) {
int avg_qp = cpi->resize_avg_qp / cpi->resize_count;
// Resize down if buffer level has underflowed sufficent amount in past
// window, and we are at original resolution.
// Resize back up if average QP is low, and we are currently in a resized
// down state.
if (cpi->resize_state == 0 &&
cpi->resize_buffer_underflow > (cpi->resize_count >> 2)) {
resize_now = 1;
cpi->resize_state = 1;
} else if (cpi->resize_state == 1 &&
avg_qp < 40 * cpi->rc.worst_quality / 100) {
resize_now = -1;
cpi->resize_state = 0;
}
// Reset for next window measurement.
cpi->resize_avg_qp = 0;
cpi->resize_count = 0;
cpi->resize_buffer_underflow = 0;
}
}
// If decision is to resize, reset some quantities, and check is we should
// reduce rate correction factor,
if (resize_now != 0) {
int target_bits_per_frame;
int active_worst_quality;
int qindex;
int tot_scale_change;
// For now, resize is by 1/2 x 1/2.
cpi->resize_scale_num = 1;
cpi->resize_scale_den = 2;
tot_scale_change = (cpi->resize_scale_den * cpi->resize_scale_den) /
(cpi->resize_scale_num * cpi->resize_scale_num);
// Reset buffer level to optimal, update target size.
rc->buffer_level = rc->optimal_buffer_level;
rc->bits_off_target = rc->optimal_buffer_level;
rc->this_frame_target = calc_pframe_target_size_one_pass_cbr(cpi);
// Reset cyclic refresh parameters.
if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled)
av1_cyclic_refresh_reset_resize(cpi);
// Get the projected qindex, based on the scaled target frame size (scaled
// so target_bits_per_mb in av1_rc_regulate_q will be correct target).
target_bits_per_frame = (resize_now == 1)
? rc->this_frame_target * tot_scale_change
: rc->this_frame_target / tot_scale_change;
active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi);
qindex = av1_rc_regulate_q(cpi, target_bits_per_frame, rc->best_quality,
active_worst_quality);
// If resize is down, check if projected q index is close to worst_quality,
// and if so, reduce the rate correction factor (since likely can afford
// lower q for resized frame).
if (resize_now == 1 && qindex > 90 * cpi->rc.worst_quality / 100) {
rc->rate_correction_factors[INTER_NORMAL] *= 0.85;
}
// If resize is back up, check if projected q index is too much above the
// current base_qindex, and if so, reduce the rate correction factor
// (since prefer to keep q for resized frame at least close to previous q).
if (resize_now == -1 && qindex > 130 * cm->base_qindex / 100) {
rc->rate_correction_factors[INTER_NORMAL] *= 0.9;
}
}
return resize_now;
}
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