ref: 7538e4cc88591fe5b161d93d4c74a20b5bc55ff2
dir: /vp9/encoder/vp9_ratectrl.c/
/*
* 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 "./vpx_dsp_rtcd.h"
#include "vpx_dsp/vpx_dsp_common.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/mem.h"
#include "vpx_ports/system_state.h"
#include "vp9/common/vp9_alloccommon.h"
#include "vp9/encoder/vp9_aq_cyclicrefresh.h"
#include "vp9/common/vp9_common.h"
#include "vp9/common/vp9_entropymode.h"
#include "vp9/common/vp9_quant_common.h"
#include "vp9/common/vp9_seg_common.h"
#include "vp9/encoder/vp9_encodemv.h"
#include "vp9/encoder/vp9_ratectrl.h"
// Max rate per frame for 1080P and below encodes if no level requirement given.
// For larger formats limit to MAX_MB_RATE bits per MB
// 4Mbits is derived from the level requirement for level 4 (1080P 30) which
// requires that HW can sustain a rate of 16Mbits over a 4 frame group.
// If a lower level requirement is specified then this may over ride this value.
#define MAX_MB_RATE 250
#define MAXRATE_1080P 4000000
#define DEFAULT_KF_BOOST 2000
#define DEFAULT_GF_BOOST 2000
#define LIMIT_QRANGE_FOR_ALTREF_AND_KEY 1
#define MIN_BPB_FACTOR 0.005
#define MAX_BPB_FACTOR 50
#if CONFIG_VP9_HIGHBITDEPTH
#define ASSIGN_MINQ_TABLE(bit_depth, name) \
do { \
switch (bit_depth) { \
case VPX_BITS_8: name = name##_8; break; \
case VPX_BITS_10: name = name##_10; break; \
default: \
assert(bit_depth == VPX_BITS_12); \
name = name##_12; \
break; \
} \
} 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_VP9_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
#ifdef AGGRESSIVE_VBR
static int gf_high = 2400;
static int gf_low = 400;
static int kf_high = 4000;
static int kf_low = 400;
#else
static int gf_high = 2000;
static int gf_low = 400;
static int kf_high = 4800;
static int kf_low = 300;
#endif
// 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,
vpx_bit_depth_t bit_depth) {
int i;
const double minqtarget = VPXMIN(((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 <= vp9_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,
vpx_bit_depth_t bit_depth) {
int i;
for (i = 0; i < QINDEX_RANGE; i++) {
const double maxq = vp9_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);
#ifdef AGGRESSIVE_VBR
arfgf_low[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.275, bit_depth);
inter[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.80, bit_depth);
#else
arfgf_low[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.30, bit_depth);
inter[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.70, bit_depth);
#endif
arfgf_high[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55, bit_depth);
rtc[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.70, bit_depth);
}
}
void vp9_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, VPX_BITS_8);
#if CONFIG_VP9_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, VPX_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, VPX_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 vp9_convert_qindex_to_q(int qindex, vpx_bit_depth_t bit_depth) {
// Convert the index to a real Q value (scaled down to match old Q values)
#if CONFIG_VP9_HIGHBITDEPTH
switch (bit_depth) {
case VPX_BITS_8: return vp9_ac_quant(qindex, 0, bit_depth) / 4.0;
case VPX_BITS_10: return vp9_ac_quant(qindex, 0, bit_depth) / 16.0;
default:
assert(bit_depth == VPX_BITS_12);
return vp9_ac_quant(qindex, 0, bit_depth) / 64.0;
}
#else
return vp9_ac_quant(qindex, 0, bit_depth) / 4.0;
#endif
}
int vp9_convert_q_to_qindex(double q_val, vpx_bit_depth_t bit_depth) {
int i;
for (i = 0; i < QINDEX_RANGE; ++i)
if (vp9_convert_qindex_to_q(i, bit_depth) >= q_val) break;
if (i == QINDEX_RANGE) i--;
return i;
}
int vp9_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex,
double correction_factor, vpx_bit_depth_t bit_depth) {
const double q = vp9_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 vp9_estimate_bits_at_q(FRAME_TYPE frame_type, int q, int mbs,
double correction_factor,
vpx_bit_depth_t bit_depth) {
const int bpm =
(int)(vp9_rc_bits_per_mb(frame_type, q, correction_factor, bit_depth));
return VPXMAX(FRAME_OVERHEAD_BITS,
(int)(((uint64_t)bpm * mbs) >> BPER_MB_NORMBITS));
}
int vp9_rc_clamp_pframe_target_size(const VP9_COMP *const cpi, int target) {
const RATE_CONTROL *rc = &cpi->rc;
const VP9EncoderConfig *oxcf = &cpi->oxcf;
if (cpi->oxcf.pass != 2) {
const int min_frame_target =
VPXMAX(rc->min_frame_bandwidth, rc->avg_frame_bandwidth >> 5);
if (target < min_frame_target) target = min_frame_target;
if (cpi->refresh_golden_frame && rc->is_src_frame_alt_ref) {
// 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;
}
}
// 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 = VPXMIN(target, max_rate);
}
return target;
}
int vp9_rc_clamp_iframe_target_size(const VP9_COMP *const cpi, int target) {
const RATE_CONTROL *rc = &cpi->rc;
const VP9EncoderConfig *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 = VPXMIN(target, max_rate);
}
if (target > rc->max_frame_bandwidth) target = rc->max_frame_bandwidth;
return 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) {
int i = 0;
int current_temporal_layer = svc->temporal_layer_id;
for (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];
RATE_CONTROL *lrc = &lc->rc;
int bits_off_for_this_layer =
(int)(lc->target_bandwidth / lc->framerate - encoded_frame_size);
lrc->bits_off_target += bits_off_for_this_layer;
// Clip buffer level to maximum buffer size for the layer.
lrc->bits_off_target =
VPXMIN(lrc->bits_off_target, lrc->maximum_buffer_size);
lrc->buffer_level = lrc->bits_off_target;
}
}
// Update the buffer level: leaky bucket model.
static void update_buffer_level(VP9_COMP *cpi, int encoded_frame_size) {
const VP9_COMMON *const cm = &cpi->common;
RATE_CONTROL *const rc = &cpi->rc;
// On dropped frame, don't update buffer if its currently stable
// (above optimal level). This can cause issues when full superframe
// can drop (!= LAYER_DROP), since QP is adjusted downwards with buffer
// overflow, which can cause more frame drops.
if (cpi->svc.framedrop_mode != LAYER_DROP && encoded_frame_size == 0 &&
rc->buffer_level > rc->optimal_buffer_level)
return;
// Non-viewable frames are a special case and are treated as pure overhead.
if (!cm->show_frame) {
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 = VPXMIN(rc->bits_off_target, rc->maximum_buffer_size);
// For screen-content mode, and if frame-dropper is off, don't let buffer
// level go below threshold, given here as -rc->maximum_ buffer_size.
if (cpi->oxcf.content == VP9E_CONTENT_SCREEN &&
cpi->oxcf.drop_frames_water_mark == 0)
rc->bits_off_target = VPXMAX(rc->bits_off_target, -rc->maximum_buffer_size);
rc->buffer_level = rc->bits_off_target;
if (is_one_pass_cbr_svc(cpi)) {
update_layer_buffer_level(&cpi->svc, encoded_frame_size);
}
}
int vp9_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 VPXMAX(default_interval,
(int)(MIN_GF_INTERVAL * factor / factor_safe + 0.5));
// Note this logic makes:
// 4K24: 5
// 4K30: 6
// 4K60: 12
}
int vp9_rc_get_default_max_gf_interval(double framerate, int min_gf_interval) {
int interval = VPXMIN(MAX_GF_INTERVAL, (int)(framerate * 0.75));
interval += (interval & 0x01); // Round to even value
return VPXMAX(interval, min_gf_interval);
}
void vp9_rc_init(const VP9EncoderConfig *oxcf, int pass, RATE_CONTROL *rc) {
int i;
if (pass == 0 && oxcf->rc_mode == VPX_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->avg_frame_low_motion = 0;
rc->count_last_scene_change = 0;
rc->af_ratio_onepass_vbr = 10;
rc->prev_avg_source_sad_lag = 0;
rc->high_source_sad = 0;
rc->reset_high_source_sad = 0;
rc->high_source_sad_lagindex = -1;
rc->alt_ref_gf_group = 0;
rc->last_frame_is_src_altref = 0;
rc->fac_active_worst_inter = 150;
rc->fac_active_worst_gf = 100;
rc->force_qpmin = 0;
for (i = 0; i < MAX_LAG_BUFFERS; ++i) rc->avg_source_sad[i] = 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 = vp9_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 = vp9_rc_get_default_min_gf_interval(
oxcf->width, oxcf->height, oxcf->init_framerate);
if (rc->max_gf_interval == 0)
rc->max_gf_interval = vp9_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;
}
static int check_buffer_above_thresh(VP9_COMP *cpi, int drop_mark) {
SVC *svc = &cpi->svc;
if (!cpi->use_svc || cpi->svc.framedrop_mode != FULL_SUPERFRAME_DROP) {
RATE_CONTROL *const rc = &cpi->rc;
return (rc->buffer_level > drop_mark);
} else {
int i;
// For SVC in the FULL_SUPERFRAME_DROP): the condition on
// buffer (if its above threshold, so no drop) is checked on current and
// upper spatial layers. If any spatial layer is not above threshold then
// we return 0.
for (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];
RATE_CONTROL *lrc = &lc->rc;
const int drop_mark_layer =
(int)(cpi->svc.framedrop_thresh[i] * lrc->optimal_buffer_level / 100);
if (!(lrc->buffer_level > drop_mark_layer)) return 0;
}
return 1;
}
}
static int check_buffer_below_thresh(VP9_COMP *cpi, int drop_mark) {
SVC *svc = &cpi->svc;
if (!cpi->use_svc || cpi->svc.framedrop_mode == LAYER_DROP) {
RATE_CONTROL *const rc = &cpi->rc;
return (rc->buffer_level <= drop_mark);
} else {
int i;
// For SVC in the constrained framedrop mode (svc->framedrop_mode =
// CONSTRAINED_LAYER_DROP or FULL_SUPERFRAME_DROP): the condition on
// buffer (if its below threshold, so drop frame) is checked on current
// and upper spatial layers. For FULL_SUPERFRAME_DROP mode if any
// spatial layer is <= threshold, then we return 1 (drop).
for (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];
RATE_CONTROL *lrc = &lc->rc;
const int drop_mark_layer =
(int)(cpi->svc.framedrop_thresh[i] * lrc->optimal_buffer_level / 100);
if (cpi->svc.framedrop_mode == FULL_SUPERFRAME_DROP) {
if (lrc->buffer_level <= drop_mark_layer) return 1;
} else {
if (!(lrc->buffer_level <= drop_mark_layer)) return 0;
}
}
if (cpi->svc.framedrop_mode == FULL_SUPERFRAME_DROP)
return 0;
else
return 1;
}
}
static int drop_frame(VP9_COMP *cpi) {
const VP9EncoderConfig *oxcf = &cpi->oxcf;
RATE_CONTROL *const rc = &cpi->rc;
SVC *svc = &cpi->svc;
int drop_frames_water_mark = oxcf->drop_frames_water_mark;
if (cpi->use_svc) {
// If we have dropped max_consec_drop frames, then we don't
// drop this spatial layer, and reset counter to 0.
if (svc->drop_count[svc->spatial_layer_id] == svc->max_consec_drop) {
svc->drop_count[svc->spatial_layer_id] = 0;
return 0;
} else {
drop_frames_water_mark = svc->framedrop_thresh[svc->spatial_layer_id];
}
}
if (!drop_frames_water_mark ||
(svc->spatial_layer_id > 0 &&
svc->framedrop_mode == FULL_SUPERFRAME_DROP)) {
return 0;
} else {
if ((rc->buffer_level < 0 && svc->framedrop_mode != FULL_SUPERFRAME_DROP) ||
(check_buffer_below_thresh(cpi, -1) &&
svc->framedrop_mode == FULL_SUPERFRAME_DROP)) {
// 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)(drop_frames_water_mark * rc->optimal_buffer_level / 100);
if (check_buffer_above_thresh(cpi, drop_mark) &&
(rc->decimation_factor > 0)) {
--rc->decimation_factor;
} else if (check_buffer_below_thresh(cpi, 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;
}
}
}
}
int vp9_rc_drop_frame(VP9_COMP *cpi) {
SVC *svc = &cpi->svc;
int svc_prev_layer_dropped = 0;
// In the constrained or full_superframe framedrop mode for svc
// (framedrop_mode != LAYER_DROP), if the previous spatial layer was
// dropped, drop the current spatial layer.
if (cpi->use_svc && svc->spatial_layer_id > 0 &&
svc->drop_spatial_layer[svc->spatial_layer_id - 1])
svc_prev_layer_dropped = 1;
if ((svc_prev_layer_dropped && svc->framedrop_mode != LAYER_DROP) ||
drop_frame(cpi)) {
vp9_rc_postencode_update_drop_frame(cpi);
cpi->ext_refresh_frame_flags_pending = 0;
cpi->last_frame_dropped = 1;
if (cpi->use_svc) {
svc->last_layer_dropped[svc->spatial_layer_id] = 1;
svc->drop_spatial_layer[svc->spatial_layer_id] = 1;
svc->drop_count[svc->spatial_layer_id]++;
svc->skip_enhancement_layer = 1;
if (svc->framedrop_mode == LAYER_DROP ||
svc->drop_spatial_layer[0] == 0) {
// For the case of constrained drop mode where the base is dropped
// (drop_spatial_layer[0] == 1), which means full superframe dropped,
// we don't increment the svc frame counters. In particular temporal
// layer counter (which is incremented in vp9_inc_frame_in_layer())
// won't be incremented, so on a dropped frame we try the same
// temporal_layer_id on next incoming frame. This is to avoid an
// issue with temporal alignement with full superframe dropping.
vp9_inc_frame_in_layer(cpi);
}
if (svc->spatial_layer_id == svc->number_spatial_layers - 1) {
int i;
int all_layers_drop = 1;
for (i = 0; i < svc->spatial_layer_id; i++) {
if (svc->drop_spatial_layer[i] == 0) {
all_layers_drop = 0;
break;
}
}
if (all_layers_drop == 1) svc->skip_enhancement_layer = 0;
}
}
return 1;
}
return 0;
}
static int adjust_q_cbr(const VP9_COMP *cpi, int q) {
// This makes sure q is between oscillating Qs to prevent resonance.
if (!cpi->rc.reset_high_source_sad &&
(!cpi->oxcf.gf_cbr_boost_pct ||
!(cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame)) &&
(cpi->rc.rc_1_frame * cpi->rc.rc_2_frame == -1) &&
cpi->rc.q_1_frame != cpi->rc.q_2_frame) {
int qclamp = clamp(q, VPXMIN(cpi->rc.q_1_frame, cpi->rc.q_2_frame),
VPXMAX(cpi->rc.q_1_frame, cpi->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)
q = (q + qclamp) >> 1;
else
q = qclamp;
}
if (cpi->oxcf.content == VP9E_CONTENT_SCREEN)
vp9_cyclic_refresh_limit_q(cpi, &q);
return q;
}
static double get_rate_correction_factor(const VP9_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->use_svc &&
(cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 100))
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(VP9_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->use_svc &&
(cpi->oxcf.rc_mode != VPX_CBR || cpi->oxcf.gf_cbr_boost_pct > 100))
rc->rate_correction_factors[GF_ARF_STD] = factor;
else
rc->rate_correction_factors[INTER_NORMAL] = factor;
}
}
void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi) {
const VP9_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
vpx_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 =
vp9_cyclic_refresh_estimate_bits_at_q(cpi, rate_correction_factor);
} else {
projected_size_based_on_q =
vp9_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 * VPXMIN(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;
// Turn off oscilation detection in the case of massive overshoot.
if (cpi->rc.rc_1_frame == -1 && cpi->rc.rc_2_frame == 1 &&
correction_factor > 1000) {
cpi->rc.rc_2_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 vp9_rc_regulate_q(const VP9_COMP *cpi, int target_bits_per_frame,
int active_best_quality, int active_worst_quality) {
const VP9_COMMON *const cm = &cpi->common;
CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
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 =
(int)(((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 &&
cr->apply_cyclic_refresh &&
(!cpi->oxcf.gf_cbr_boost_pct || !cpi->refresh_golden_frame)) {
bits_per_mb_at_this_q =
(int)vp9_cyclic_refresh_rc_bits_per_mb(cpi, i, correction_factor);
} else {
bits_per_mb_at_this_q = (int)vp9_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);
// Adjustment to q for CBR mode.
if (cpi->oxcf.rc_mode == VPX_CBR) return adjust_q_cbr(cpi, q);
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,
vpx_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,
vpx_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 VP9_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] << 1;
} 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 >> 2
: rc->last_q[INTER_FRAME] * rc->fac_active_worst_gf / 100;
} else {
active_worst_quality = curr_frame == 1
? rc->last_q[KEY_FRAME] << 1
: rc->avg_frame_qindex[INTER_FRAME] *
rc->fac_active_worst_inter / 100;
}
}
return VPXMIN(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 VP9_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 VP9_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;
unsigned int num_frames_weight_key = 5 * cpi->svc.number_temporal_layers;
if (cm->frame_type == KEY_FRAME || rc->reset_high_source_sad)
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 < num_frames_weight_key)
? VPXMIN(rc->avg_frame_qindex[INTER_FRAME],
rc->avg_frame_qindex[KEY_FRAME])
: rc->avg_frame_qindex[INTER_FRAME];
// For SVC if the current base spatial layer was key frame, use the QP from
// that base layer for ambient_qp.
if (cpi->use_svc && cpi->svc.spatial_layer_id > 0) {
int layer = LAYER_IDS_TO_IDX(0, cpi->svc.temporal_layer_id,
cpi->svc.number_temporal_layers);
const LAYER_CONTEXT *lc = &cpi->svc.layer_context[layer];
if (lc->is_key_frame) {
const RATE_CONTROL *lrc = &lc->rc;
ambient_qp = VPXMIN(ambient_qp, lrc->last_q[KEY_FRAME]);
}
}
active_worst_quality = VPXMIN(rc->worst_quality, ambient_qp * 5 >> 2);
if (rc->buffer_level > rc->optimal_buffer_level) {
// Adjust down.
// Maximum limit for down adjustment ~30%; make it lower for screen content.
int max_adjustment_down = active_worst_quality / 3;
if (cpi->oxcf.content == VP9E_CONTENT_SCREEN)
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 VP9_COMP *cpi,
int *bottom_index,
int *top_index) {
const VP9_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 = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
int delta_qindex = vp9_compute_qdelta(
rc, last_boosted_q, (last_boosted_q * 0.75), cm->bit_depth);
active_best_quality = VPXMAX(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 = vp9_convert_qindex_to_q(active_best_quality, cm->bit_depth);
active_best_quality +=
vp9_compute_qdelta(rc, q_val, q_val * q_adj_factor, cm->bit_depth);
}
} else if (!rc->is_src_frame_alt_ref && !cpi->use_svc &&
(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;
// 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 = vp9_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_one_pass(const RATE_CONTROL *rc,
const VP9EncoderConfig *const oxcf) {
static const double cq_adjust_threshold = 0.1;
int active_cq_level = oxcf->cq_level;
if (oxcf->rc_mode == VPX_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;
}
#define SMOOTH_PCT_MIN 0.1
#define SMOOTH_PCT_DIV 0.05
static int get_active_cq_level_two_pass(const TWO_PASS *twopass,
const RATE_CONTROL *rc,
const VP9EncoderConfig *const oxcf) {
static const double cq_adjust_threshold = 0.1;
int active_cq_level = oxcf->cq_level;
if (oxcf->rc_mode == VPX_CQ) {
if (twopass->mb_smooth_pct > SMOOTH_PCT_MIN) {
active_cq_level -=
(int)((twopass->mb_smooth_pct - SMOOTH_PCT_MIN) / SMOOTH_PCT_DIV);
active_cq_level = VPXMAX(active_cq_level, 0);
}
if (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 VP9_COMP *cpi,
int *bottom_index,
int *top_index) {
const VP9_COMMON *const cm = &cpi->common;
const RATE_CONTROL *const rc = &cpi->rc;
const VP9EncoderConfig *const oxcf = &cpi->oxcf;
const int cq_level = get_active_cq_level_one_pass(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 == VPX_Q) {
int qindex = cq_level;
double q = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
int delta_qindex = vp9_compute_qdelta(rc, q, q * 0.25, cm->bit_depth);
active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
} else if (rc->this_key_frame_forced) {
// 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.
int qindex = rc->last_boosted_qindex;
double last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
int delta_qindex = vp9_compute_qdelta(
rc, last_boosted_q, last_boosted_q * 0.75, cm->bit_depth);
active_best_quality = VPXMAX(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 = vp9_convert_qindex_to_q(active_best_quality, cm->bit_depth);
active_best_quality +=
vp9_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) {
if (rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
q = rc->avg_frame_qindex[INTER_FRAME];
} else {
q = active_worst_quality;
}
} else {
q = rc->avg_frame_qindex[KEY_FRAME];
}
// For constrained quality dont allow Q less than the cq level
if (oxcf->rc_mode == VPX_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 == VPX_Q) {
int qindex = cq_level;
double q = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
int delta_qindex;
if (cpi->refresh_alt_ref_frame)
delta_qindex = vp9_compute_qdelta(rc, q, q * 0.40, cm->bit_depth);
else
delta_qindex = vp9_compute_qdelta(rc, q, q * 0.50, cm->bit_depth);
active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
} else {
active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth);
}
} else {
if (oxcf->rc_mode == VPX_Q) {
int qindex = cq_level;
double q = vp9_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 = vp9_compute_qdelta(
rc, q, q * delta_rate[cm->current_video_frame % FIXED_GF_INTERVAL],
cm->bit_depth);
active_best_quality = VPXMAX(qindex + delta_qindex, rc->best_quality);
} else {
// Use the min of the average Q and active_worst_quality as basis for
// active_best.
if (cm->current_video_frame > 1) {
q = VPXMIN(rc->avg_frame_qindex[INTER_FRAME], active_worst_quality);
active_best_quality = inter_minq[q];
} 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 == VPX_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;
#if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
{
int qdelta = 0;
vpx_clear_system_state();
// Limit Q range for the adaptive loop.
if (cm->frame_type == KEY_FRAME && !rc->this_key_frame_forced &&
!(cm->current_video_frame == 0)) {
qdelta = vp9_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 = vp9_compute_qdelta_by_rate(
&cpi->rc, cm->frame_type, active_worst_quality, 1.75, cm->bit_depth);
}
if (rc->high_source_sad && cpi->sf.use_altref_onepass) qdelta = 0;
*top_index = active_worst_quality + qdelta;
*top_index = (*top_index > *bottom_index) ? *top_index : *bottom_index;
}
#endif
if (oxcf->rc_mode == VPX_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 = vp9_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 vp9_frame_type_qdelta(const VP9_COMP *cpi, int rf_level, int q) {
static const double rate_factor_deltas[RATE_FACTOR_LEVELS] = {
1.00, // INTER_NORMAL
1.00, // INTER_HIGH
1.50, // GF_ARF_LOW
1.75, // GF_ARF_STD
2.00, // KF_STD
};
static const FRAME_TYPE frame_type[RATE_FACTOR_LEVELS] = {
INTER_FRAME, INTER_FRAME, INTER_FRAME, INTER_FRAME, KEY_FRAME
};
const VP9_COMMON *const cm = &cpi->common;
int qdelta =
vp9_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 VP9_COMP *cpi, int *bottom_index,
int *top_index) {
const VP9_COMMON *const cm = &cpi->common;
const RATE_CONTROL *const rc = &cpi->rc;
const VP9EncoderConfig *const oxcf = &cpi->oxcf;
const GF_GROUP *gf_group = &cpi->twopass.gf_group;
const int cq_level = get_active_cq_level_two_pass(&cpi->twopass, 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 = VPXMIN(rc->last_kf_qindex, rc->last_boosted_qindex);
active_best_quality = qindex;
last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
last_boosted_q * 1.25, cm->bit_depth);
active_worst_quality =
VPXMIN(qindex + delta_qindex, active_worst_quality);
} else {
qindex = rc->last_boosted_qindex;
last_boosted_q = vp9_convert_qindex_to_q(qindex, cm->bit_depth);
delta_qindex = vp9_compute_qdelta(rc, last_boosted_q,
last_boosted_q * 0.75, cm->bit_depth);
active_best_quality = VPXMAX(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 = vp9_convert_qindex_to_q(active_best_quality, cm->bit_depth);
active_best_quality +=
vp9_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 == VPX_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 == VPX_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 VPX_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 == VPX_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 == VPX_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 != VPX_Q) {
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;
}
}
#if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
vpx_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 = vp9_frame_type_qdelta(cpi, gf_group->rf_level[gf_group->index],
active_worst_quality);
active_worst_quality =
VPXMAX(active_worst_quality + qdelta, active_best_quality);
}
#endif
// Modify active_best_quality for downscaled normal frames.
if (rc->frame_size_selector != UNSCALED && !frame_is_kf_gf_arf(cpi)) {
int qdelta = vp9_compute_qdelta_by_rate(
rc, cm->frame_type, active_best_quality, 2.0, cm->bit_depth);
active_best_quality =
VPXMAX(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 == VPX_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 = VPXMIN(rc->last_kf_qindex, rc->last_boosted_qindex);
} else {
q = rc->last_boosted_qindex;
}
} else {
q = vp9_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 vp9_rc_pick_q_and_bounds(const VP9_COMP *cpi, int *bottom_index,
int *top_index) {
int q;
if (cpi->oxcf.pass == 0) {
if (cpi->oxcf.rc_mode == VPX_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);
}
if (cpi->sf.use_nonrd_pick_mode) {
if (cpi->sf.force_frame_boost == 1) q -= cpi->sf.max_delta_qindex;
if (q < *bottom_index)
*bottom_index = q;
else if (q > *top_index)
*top_index = q;
}
return q;
}
void vp9_rc_compute_frame_size_bounds(const VP9_COMP *cpi, int frame_target,
int *frame_under_shoot_limit,
int *frame_over_shoot_limit) {
if (cpi->oxcf.rc_mode == VPX_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 tol_low = (cpi->sf.recode_tolerance_low * frame_target) / 100;
const int tol_high = (cpi->sf.recode_tolerance_high * frame_target) / 100;
*frame_under_shoot_limit = VPXMAX(frame_target - tol_low - 100, 0);
*frame_over_shoot_limit =
VPXMIN(frame_target + tol_high + 100, cpi->rc.max_frame_bandwidth);
}
}
void vp9_rc_set_frame_target(VP9_COMP *cpi, int target) {
const VP9_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 = (int)(((int64_t)rc->this_frame_target * 64 * 64) /
(cm->width * cm->height));
}
static void update_alt_ref_frame_stats(VP9_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(VP9_COMP *cpi) {
RATE_CONTROL *const rc = &cpi->rc;
// Update the Golden frame usage counts.
if (cpi->refresh_golden_frame) {
// 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++;
}
}
static void update_altref_usage(VP9_COMP *const cpi) {
VP9_COMMON *const cm = &cpi->common;
int sum_ref_frame_usage = 0;
int arf_frame_usage = 0;
int mi_row, mi_col;
if (cpi->rc.alt_ref_gf_group && !cpi->rc.is_src_frame_alt_ref &&
!cpi->refresh_golden_frame && !cpi->refresh_alt_ref_frame)
for (mi_row = 0; mi_row < cm->mi_rows; mi_row += 8) {
for (mi_col = 0; mi_col < cm->mi_cols; mi_col += 8) {
int sboffset = ((cm->mi_cols + 7) >> 3) * (mi_row >> 3) + (mi_col >> 3);
sum_ref_frame_usage += cpi->count_arf_frame_usage[sboffset] +
cpi->count_lastgolden_frame_usage[sboffset];
arf_frame_usage += cpi->count_arf_frame_usage[sboffset];
}
}
if (sum_ref_frame_usage > 0) {
double altref_count = 100.0 * arf_frame_usage / sum_ref_frame_usage;
cpi->rc.perc_arf_usage =
0.75 * cpi->rc.perc_arf_usage + 0.25 * altref_count;
}
}
static void compute_frame_low_motion(VP9_COMP *const cpi) {
VP9_COMMON *const cm = &cpi->common;
int mi_row, mi_col;
MODE_INFO **mi = cm->mi_grid_visible;
RATE_CONTROL *const rc = &cpi->rc;
const int rows = cm->mi_rows, cols = cm->mi_cols;
int cnt_zeromv = 0;
for (mi_row = 0; mi_row < rows; mi_row++) {
for (mi_col = 0; mi_col < cols; mi_col++) {
if (mi[0]->ref_frame[0] == LAST_FRAME &&
abs(mi[0]->mv[0].as_mv.row) < 16 && abs(mi[0]->mv[0].as_mv.col) < 16)
cnt_zeromv++;
mi++;
}
mi += 8;
}
cnt_zeromv = 100 * cnt_zeromv / (rows * cols);
rc->avg_frame_low_motion = (3 * rc->avg_frame_low_motion + cnt_zeromv) >> 2;
}
void vp9_rc_postencode_update(VP9_COMP *cpi, uint64_t bytes_used) {
const VP9_COMMON *const cm = &cpi->common;
const VP9EncoderConfig *const oxcf = &cpi->oxcf;
RATE_CONTROL *const rc = &cpi->rc;
const int qindex = cm->base_qindex;
// Update rate control heuristics
rc->projected_frame_size = (int)(bytes_used << 3);
// Post encode loop adjustment of Q prediction.
vp9_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);
if (cpi->use_svc) {
int i = 0;
SVC *svc = &cpi->svc;
for (i = 0; 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];
RATE_CONTROL *lrc = &lc->rc;
lrc->last_q[KEY_FRAME] = rc->last_q[KEY_FRAME];
lrc->avg_frame_qindex[KEY_FRAME] = rc->avg_frame_qindex[KEY_FRAME];
}
}
} else {
if ((cpi->use_svc && oxcf->rc_mode == VPX_CBR) ||
(!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 += vp9_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/KF/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;
rc->total_target_bits += cm->show_frame ? rc->avg_frame_bandwidth : 0;
rc->total_target_vs_actual = rc->total_actual_bits - rc->total_target_bits;
if (!cpi->use_svc) {
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 second (long term) temporal reference is used for SVC,
// update the golden frame counter, only for base temporal layer.
if (cpi->use_svc && cpi->svc.use_gf_temporal_ref_current_layer &&
cpi->svc.temporal_layer_id == 0) {
int i = 0;
SVC *const svc = &cpi->svc;
if (cpi->refresh_golden_frame)
rc->frames_since_golden = 0;
else
rc->frames_since_golden++;
// Decrement count down till next gf
if (rc->frames_till_gf_update_due > 0) rc->frames_till_gf_update_due--;
// Update the frames_since_golden for all upper temporal layers.
for (i = 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 *const lc = &svc->layer_context[layer];
RATE_CONTROL *const lrc = &lc->rc;
lrc->frames_since_golden = rc->frames_since_golden;
}
}
if (cm->frame_type == KEY_FRAME) rc->frames_since_key = 0;
if (cm->show_frame) {
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;
}
if (oxcf->pass == 0) {
if (cm->frame_type != KEY_FRAME &&
(!cpi->use_svc ||
(cpi->use_svc &&
!cpi->svc.layer_context[cpi->svc.temporal_layer_id].is_key_frame &&
cpi->svc.spatial_layer_id == cpi->svc.number_spatial_layers - 1))) {
compute_frame_low_motion(cpi);
if (cpi->sf.use_altref_onepass) update_altref_usage(cpi);
}
cpi->rc.last_frame_is_src_altref = cpi->rc.is_src_frame_alt_ref;
}
if (cm->frame_type != KEY_FRAME) rc->reset_high_source_sad = 0;
rc->last_avg_frame_bandwidth = rc->avg_frame_bandwidth;
if (cpi->use_svc &&
cpi->svc.spatial_layer_id < cpi->svc.number_spatial_layers - 1)
cpi->svc.lower_layer_qindex = cm->base_qindex;
}
void vp9_rc_postencode_update_drop_frame(VP9_COMP *cpi) {
// Update buffer level with zero size, update frame counters, and return.
update_buffer_level(cpi, 0);
cpi->common.current_video_frame++;
cpi->rc.frames_since_key++;
cpi->rc.frames_to_key--;
cpi->rc.rc_2_frame = 0;
cpi->rc.rc_1_frame = 0;
cpi->rc.last_avg_frame_bandwidth = cpi->rc.avg_frame_bandwidth;
}
static int calc_pframe_target_size_one_pass_vbr(const VP9_COMP *const cpi) {
const RATE_CONTROL *const rc = &cpi->rc;
const int af_ratio = rc->af_ratio_onepass_vbr;
int 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);
return vp9_rc_clamp_pframe_target_size(cpi, target);
}
static int calc_iframe_target_size_one_pass_vbr(const VP9_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 vp9_rc_clamp_iframe_target_size(cpi, target);
}
static void adjust_gfint_frame_constraint(VP9_COMP *cpi, int frame_constraint) {
RATE_CONTROL *const rc = &cpi->rc;
rc->constrained_gf_group = 0;
// Reset gf interval to make more equal spacing for frame_constraint.
if ((frame_constraint <= 7 * rc->baseline_gf_interval >> 2) &&
(frame_constraint > rc->baseline_gf_interval)) {
rc->baseline_gf_interval = frame_constraint >> 1;
if (rc->baseline_gf_interval < 5)
rc->baseline_gf_interval = frame_constraint;
rc->constrained_gf_group = 1;
} else {
// Reset to keep gf_interval <= frame_constraint.
if (rc->baseline_gf_interval > frame_constraint) {
rc->baseline_gf_interval = frame_constraint;
rc->constrained_gf_group = 1;
}
}
}
void vp9_rc_get_one_pass_vbr_params(VP9_COMP *cpi) {
VP9_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) {
double rate_err = 1.0;
rc->gfu_boost = DEFAULT_GF_BOOST;
if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->oxcf.pass == 0) {
vp9_cyclic_refresh_set_golden_update(cpi);
} else {
rc->baseline_gf_interval = VPXMIN(
20, VPXMAX(10, (rc->min_gf_interval + rc->max_gf_interval) / 2));
}
rc->af_ratio_onepass_vbr = 10;
if (rc->rolling_target_bits > 0)
rate_err =
(double)rc->rolling_actual_bits / (double)rc->rolling_target_bits;
if (cm->current_video_frame > 30) {
if (rc->avg_frame_qindex[INTER_FRAME] > (7 * rc->worst_quality) >> 3 &&
rate_err > 3.5) {
rc->baseline_gf_interval =
VPXMIN(15, (3 * rc->baseline_gf_interval) >> 1);
} else if (rc->avg_frame_low_motion < 20) {
// Decrease gf interval for high motion case.
rc->baseline_gf_interval = VPXMAX(6, rc->baseline_gf_interval >> 1);
}
// Adjust boost and af_ratio based on avg_frame_low_motion, which varies
// between 0 and 100 (stationary, 100% zero/small motion).
rc->gfu_boost =
VPXMAX(500, DEFAULT_GF_BOOST * (rc->avg_frame_low_motion << 1) /
(rc->avg_frame_low_motion + 100));
rc->af_ratio_onepass_vbr = VPXMIN(15, VPXMAX(5, 3 * rc->gfu_boost / 400));
}
adjust_gfint_frame_constraint(cpi, rc->frames_to_key);
rc->frames_till_gf_update_due = rc->baseline_gf_interval;
cpi->refresh_golden_frame = 1;
rc->source_alt_ref_pending = 0;
rc->alt_ref_gf_group = 0;
if (cpi->sf.use_altref_onepass && cpi->oxcf.enable_auto_arf) {
rc->source_alt_ref_pending = 1;
rc->alt_ref_gf_group = 1;
}
}
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);
vp9_rc_set_frame_target(cpi, target);
if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->oxcf.pass == 0)
vp9_cyclic_refresh_update_parameters(cpi);
}
static int calc_pframe_target_size_one_pass_cbr(const VP9_COMP *cpi) {
const VP9EncoderConfig *oxcf = &cpi->oxcf;
const RATE_CONTROL *rc = &cpi->rc;
const SVC *const svc = &cpi->svc;
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 =
VPXMAX(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 (is_one_pass_cbr_svc(cpi)) {
// Note that for layers, avg_frame_bandwidth is the cumulative
// per-frame-bandwidth. For the target size of this frame, use the
// layer average frame size (i.e., non-cumulative per-frame-bw).
int layer = LAYER_IDS_TO_IDX(svc->spatial_layer_id, svc->temporal_layer_id,
svc->number_temporal_layers);
const LAYER_CONTEXT *lc = &svc->layer_context[layer];
target = lc->avg_frame_size;
min_frame_target = VPXMAX(lc->avg_frame_size >> 4, FRAME_OVERHEAD_BITS);
}
if (diff > 0) {
// Lower the target bandwidth for this frame.
const int pct_low = (int)VPXMIN(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)VPXMIN(-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 = VPXMIN(target, max_rate);
}
return VPXMAX(min_frame_target, target);
}
static int calc_iframe_target_size_one_pass_cbr(const VP9_COMP *cpi) {
const RATE_CONTROL *rc = &cpi->rc;
const VP9EncoderConfig *oxcf = &cpi->oxcf;
const SVC *const svc = &cpi->svc;
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;
if (svc->number_temporal_layers > 1 && oxcf->rc_mode == VPX_CBR) {
// Use the layer framerate for temporal layers CBR mode.
const int layer =
LAYER_IDS_TO_IDX(svc->spatial_layer_id, svc->temporal_layer_id,
svc->number_temporal_layers);
const LAYER_CONTEXT *lc = &svc->layer_context[layer];
framerate = lc->framerate;
}
kf_boost = VPXMAX(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 vp9_rc_clamp_iframe_target_size(cpi, target);
}
void vp9_rc_get_svc_params(VP9_COMP *cpi) {
VP9_COMMON *const cm = &cpi->common;
RATE_CONTROL *const rc = &cpi->rc;
SVC *const svc = &cpi->svc;
int target = rc->avg_frame_bandwidth;
int layer = LAYER_IDS_TO_IDX(svc->spatial_layer_id, svc->temporal_layer_id,
svc->number_temporal_layers);
// Periodic key frames is based on the super-frame counter
// (svc.current_superframe), also only base spatial layer is key frame.
if ((cm->current_video_frame == 0) || (cpi->frame_flags & FRAMEFLAGS_KEY) ||
(cpi->oxcf.auto_key &&
(svc->current_superframe % cpi->oxcf.key_freq == 0) &&
svc->spatial_layer_id == 0)) {
cm->frame_type = KEY_FRAME;
rc->source_alt_ref_active = 0;
if (is_one_pass_cbr_svc(cpi)) {
if (cm->current_video_frame > 0) vp9_svc_reset_key_frame(cpi);
layer = LAYER_IDS_TO_IDX(svc->spatial_layer_id, svc->temporal_layer_id,
svc->number_temporal_layers);
svc->layer_context[layer].is_key_frame = 1;
cpi->ref_frame_flags &= (~VP9_LAST_FLAG & ~VP9_GOLD_FLAG & ~VP9_ALT_FLAG);
// Assumption here is that LAST_FRAME is being updated for a keyframe.
// Thus no change in update flags.
target = calc_iframe_target_size_one_pass_cbr(cpi);
}
} else {
cm->frame_type = INTER_FRAME;
if (is_one_pass_cbr_svc(cpi)) {
LAYER_CONTEXT *lc = &svc->layer_context[layer];
lc->is_key_frame =
svc->spatial_layer_id == 0
? 0
: svc->layer_context[svc->temporal_layer_id].is_key_frame;
target = calc_pframe_target_size_one_pass_cbr(cpi);
}
}
// If long term termporal feature is enabled, set the period of the update.
// The update/refresh of this reference frame is always on base temporal
// layer frame.
if (svc->use_gf_temporal_ref_current_layer) {
// Only use gf long-term prediction on non-key superframes.
if (!svc->layer_context[svc->temporal_layer_id].is_key_frame) {
// Use golden for this reference, which will be used for prediction.
int index = svc->spatial_layer_id;
if (svc->number_spatial_layers == 3) index = svc->spatial_layer_id - 1;
assert(index >= 0);
cpi->gld_fb_idx = svc->buffer_gf_temporal_ref[index].idx;
// Enable prediction off LAST (last reference) and golden (which will
// generally be further behind/long-term reference).
cpi->ref_frame_flags = VP9_LAST_FLAG | VP9_GOLD_FLAG;
}
// Check for update/refresh of reference: only refresh on base temporal
// layer.
if (svc->temporal_layer_id == 0) {
if (svc->layer_context[svc->temporal_layer_id].is_key_frame) {
// On key frame we update the buffer index used for long term reference.
// Use the alt_ref since it is not used or updated on key frames.
int index = svc->spatial_layer_id;
if (svc->number_spatial_layers == 3) index = svc->spatial_layer_id - 1;
assert(index >= 0);
cpi->alt_fb_idx = svc->buffer_gf_temporal_ref[index].idx;
cpi->ext_refresh_alt_ref_frame = 1;
} else if (rc->frames_till_gf_update_due == 0) {
// Set perdiod of next update. Make it a multiple of 10, as the cyclic
// refresh is typically ~10%, and we'd like the update to happen after
// a few cylces of the refresh (so it better quality frame). Note the
// cyclic refresh for SVC only operates on base temporal layer frames.
// Choose 20 as perdiod for now (2 cycles).
rc->baseline_gf_interval = 20;
rc->frames_till_gf_update_due = rc->baseline_gf_interval;
cpi->ext_refresh_golden_frame = 1;
rc->gfu_boost = DEFAULT_GF_BOOST;
}
}
} else if (!svc->use_gf_temporal_ref) {
rc->frames_till_gf_update_due = INT_MAX;
rc->baseline_gf_interval = INT_MAX;
}
// 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)
vp9_cyclic_refresh_update_parameters(cpi);
vp9_rc_set_frame_target(cpi, target);
}
void vp9_rc_get_one_pass_cbr_params(VP9_COMP *cpi) {
VP9_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->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)
vp9_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)
vp9_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);
vp9_rc_set_frame_target(cpi, target);
if (cpi->oxcf.resize_mode == RESIZE_DYNAMIC)
cpi->resize_pending = vp9_resize_one_pass_cbr(cpi);
else
cpi->resize_pending = 0;
}
int vp9_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget,
vpx_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 (vp9_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 (vp9_convert_qindex_to_q(i, bit_depth) >= qtarget) break;
}
return target_index - start_index;
}
int vp9_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type,
int qindex, double rate_target_ratio,
vpx_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 =
vp9_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 (vp9_rc_bits_per_mb(frame_type, i, 1.0, bit_depth) <=
target_bits_per_mb) {
target_index = i;
break;
}
}
return target_index - qindex;
}
void vp9_rc_set_gf_interval_range(const VP9_COMP *const cpi,
RATE_CONTROL *const rc) {
const VP9EncoderConfig *const oxcf = &cpi->oxcf;
// Special case code for 1 pass fixed Q mode tests
if ((oxcf->pass == 0) && (oxcf->rc_mode == VPX_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 = vp9_rc_get_default_min_gf_interval(
oxcf->width, oxcf->height, cpi->framerate);
if (rc->max_gf_interval == 0)
rc->max_gf_interval = vp9_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 = VPXMIN(rc->min_gf_interval, rc->max_gf_interval);
if (oxcf->target_level == LEVEL_AUTO) {
const uint32_t pic_size = cpi->common.width * cpi->common.height;
const uint32_t pic_breadth =
VPXMAX(cpi->common.width, cpi->common.height);
int i;
for (i = LEVEL_1; i < LEVEL_MAX; ++i) {
if (vp9_level_defs[i].max_luma_picture_size >= pic_size &&
vp9_level_defs[i].max_luma_picture_breadth >= pic_breadth) {
if (rc->min_gf_interval <=
(int)vp9_level_defs[i].min_altref_distance) {
rc->min_gf_interval =
(int)vp9_level_defs[i].min_altref_distance + 1;
rc->max_gf_interval =
VPXMAX(rc->max_gf_interval, rc->min_gf_interval);
}
break;
}
}
}
}
}
void vp9_rc_update_framerate(VP9_COMP *cpi) {
const VP9_COMMON *const cm = &cpi->common;
const VP9EncoderConfig *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 =
VPXMAX(rc->min_frame_bandwidth, FRAME_OVERHEAD_BITS);
// A maximum bitrate for a frame is defined.
// 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).
//
// If a level is specified that requires a lower maximum rate then the level
// value take precedence.
vbr_max_bits =
(int)(((int64_t)rc->avg_frame_bandwidth * oxcf->two_pass_vbrmax_section) /
100);
rc->max_frame_bandwidth =
VPXMAX(VPXMAX((cm->MBs * MAX_MB_RATE), MAXRATE_1080P), vbr_max_bits);
vp9_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(VP9_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;
int frame_window = VPXMIN(16, ((int)cpi->twopass.total_stats.count -
cpi->common.current_video_frame));
// Calcluate the adjustment to rate for this frame.
if (frame_window > 0) {
max_delta = (vbr_bits_off_target > 0)
? (int)(vbr_bits_off_target / frame_window)
: (int)(-vbr_bits_off_target / frame_window);
max_delta = VPXMIN(max_delta,
((*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 = VPXMAX(rc->avg_frame_bandwidth, *this_frame_target);
int fast_extra_bits;
fast_extra_bits = (int)VPXMIN(rc->vbr_bits_off_target_fast, one_frame_bits);
fast_extra_bits = (int)VPXMIN(
fast_extra_bits,
VPXMAX(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 vp9_set_target_rate(VP9_COMP *cpi) {
RATE_CONTROL *const rc = &cpi->rc;
int target_rate = rc->base_frame_target;
if (cpi->common.frame_type == KEY_FRAME)
target_rate = vp9_rc_clamp_iframe_target_size(cpi, target_rate);
else
target_rate = vp9_rc_clamp_pframe_target_size(cpi, target_rate);
if (!cpi->oxcf.vbr_corpus_complexity) {
// Correction to rate target based on prior over or under shoot.
if (cpi->oxcf.rc_mode == VPX_VBR || cpi->oxcf.rc_mode == VPX_CQ)
vbr_rate_correction(cpi, &target_rate);
}
vp9_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 vp9_resize_one_pass_cbr(VP9_COMP *cpi) {
const VP9_COMMON *const cm = &cpi->common;
RATE_CONTROL *const rc = &cpi->rc;
RESIZE_ACTION resize_action = NO_RESIZE;
int avg_qp_thr1 = 70;
int avg_qp_thr2 = 50;
int min_width = 180;
int min_height = 180;
int down_size_on = 1;
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;
}
// Check current frame reslution to avoid generating frames smaller than
// the minimum resolution.
if (ONEHALFONLY_RESIZE) {
if ((cm->width >> 1) < min_width || (cm->height >> 1) < min_height)
down_size_on = 0;
} else {
if (cpi->resize_state == ORIG &&
(cm->width * 3 / 4 < min_width || cm->height * 3 / 4 < min_height))
return 0;
else if (cpi->resize_state == THREE_QUARTER &&
((cpi->oxcf.width >> 1) < min_width ||
(cpi->oxcf.height >> 1) < min_height))
down_size_on = 0;
}
#if CONFIG_VP9_TEMPORAL_DENOISING
// If denoiser is on, apply a smaller qp threshold.
if (cpi->oxcf.noise_sensitivity > 0) {
avg_qp_thr1 = 60;
avg_qp_thr2 = 40;
}
#endif
// 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)(4 * 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 sufficient amount in past
// window, and we are at original or 3/4 of original resolution.
// Resize back up if average QP is low, and we are currently in a resized
// down state, i.e. 1/2 or 3/4 of original resolution.
// Currently, use a flag to turn 3/4 resizing feature on/off.
if (cpi->resize_buffer_underflow > (cpi->resize_count >> 2)) {
if (cpi->resize_state == THREE_QUARTER && down_size_on) {
resize_action = DOWN_ONEHALF;
cpi->resize_state = ONE_HALF;
} else if (cpi->resize_state == ORIG) {
resize_action = ONEHALFONLY_RESIZE ? DOWN_ONEHALF : DOWN_THREEFOUR;
cpi->resize_state = ONEHALFONLY_RESIZE ? ONE_HALF : THREE_QUARTER;
}
} else if (cpi->resize_state != ORIG &&
avg_qp < avg_qp_thr1 * cpi->rc.worst_quality / 100) {
if (cpi->resize_state == THREE_QUARTER ||
avg_qp < avg_qp_thr2 * cpi->rc.worst_quality / 100 ||
ONEHALFONLY_RESIZE) {
resize_action = UP_ORIG;
cpi->resize_state = ORIG;
} else if (cpi->resize_state == ONE_HALF) {
resize_action = UP_THREEFOUR;
cpi->resize_state = THREE_QUARTER;
}
}
// 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_action != NO_RESIZE) {
int target_bits_per_frame;
int active_worst_quality;
int qindex;
int tot_scale_change;
if (resize_action == DOWN_THREEFOUR || resize_action == UP_THREEFOUR) {
cpi->resize_scale_num = 3;
cpi->resize_scale_den = 4;
} else if (resize_action == DOWN_ONEHALF) {
cpi->resize_scale_num = 1;
cpi->resize_scale_den = 2;
} else { // UP_ORIG or anything else
cpi->resize_scale_num = 1;
cpi->resize_scale_den = 1;
}
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);
// Get the projected qindex, based on the scaled target frame size (scaled
// so target_bits_per_mb in vp9_rc_regulate_q will be correct target).
target_bits_per_frame = (resize_action >= 0)
? 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 = vp9_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_action > 0 && 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_action < 0 && qindex > 130 * cm->base_qindex / 100) {
rc->rate_correction_factors[INTER_NORMAL] *= 0.9;
}
}
return resize_action;
}
static void adjust_gf_boost_lag_one_pass_vbr(VP9_COMP *cpi,
uint64_t avg_sad_current) {
VP9_COMMON *const cm = &cpi->common;
RATE_CONTROL *const rc = &cpi->rc;
int target;
int found = 0;
int found2 = 0;
int frame;
int i;
uint64_t avg_source_sad_lag = avg_sad_current;
int high_source_sad_lagindex = -1;
int steady_sad_lagindex = -1;
uint32_t sad_thresh1 = 70000;
uint32_t sad_thresh2 = 120000;
int low_content = 0;
int high_content = 0;
double rate_err = 1.0;
// Get measure of complexity over the future frames, and get the first
// future frame with high_source_sad/scene-change.
int tot_frames = (int)vp9_lookahead_depth(cpi->lookahead) - 1;
for (frame = tot_frames; frame >= 1; --frame) {
const int lagframe_idx = tot_frames - frame + 1;
uint64_t reference_sad = rc->avg_source_sad[0];
for (i = 1; i < lagframe_idx; ++i) {
if (rc->avg_source_sad[i] > 0)
reference_sad = (3 * reference_sad + rc->avg_source_sad[i]) >> 2;
}
// Detect up-coming scene change.
if (!found &&
(rc->avg_source_sad[lagframe_idx] >
VPXMAX(sad_thresh1, (unsigned int)(reference_sad << 1)) ||
rc->avg_source_sad[lagframe_idx] >
VPXMAX(3 * sad_thresh1 >> 2,
(unsigned int)(reference_sad << 2)))) {
high_source_sad_lagindex = lagframe_idx;
found = 1;
}
// Detect change from motion to steady.
if (!found2 && lagframe_idx > 1 && lagframe_idx < tot_frames &&
rc->avg_source_sad[lagframe_idx - 1] > (sad_thresh1 >> 2)) {
found2 = 1;
for (i = lagframe_idx; i < tot_frames; ++i) {
if (!(rc->avg_source_sad[i] > 0 &&
rc->avg_source_sad[i] < (sad_thresh1 >> 2) &&
rc->avg_source_sad[i] <
(rc->avg_source_sad[lagframe_idx - 1] >> 1))) {
found2 = 0;
i = tot_frames;
}
}
if (found2) steady_sad_lagindex = lagframe_idx;
}
avg_source_sad_lag += rc->avg_source_sad[lagframe_idx];
}
if (tot_frames > 0) avg_source_sad_lag = avg_source_sad_lag / tot_frames;
// Constrain distance between detected scene cuts.
if (high_source_sad_lagindex != -1 &&
high_source_sad_lagindex != rc->high_source_sad_lagindex - 1 &&
abs(high_source_sad_lagindex - rc->high_source_sad_lagindex) < 4)
rc->high_source_sad_lagindex = -1;
else
rc->high_source_sad_lagindex = high_source_sad_lagindex;
// Adjust some factors for the next GF group, ignore initial key frame,
// and only for lag_in_frames not too small.
if (cpi->refresh_golden_frame == 1 && cm->current_video_frame > 30 &&
cpi->oxcf.lag_in_frames > 8) {
int frame_constraint;
if (rc->rolling_target_bits > 0)
rate_err =
(double)rc->rolling_actual_bits / (double)rc->rolling_target_bits;
high_content = high_source_sad_lagindex != -1 ||
avg_source_sad_lag > (rc->prev_avg_source_sad_lag << 1) ||
avg_source_sad_lag > sad_thresh2;
low_content = high_source_sad_lagindex == -1 &&
((avg_source_sad_lag < (rc->prev_avg_source_sad_lag >> 1)) ||
(avg_source_sad_lag < sad_thresh1));
if (low_content) {
rc->gfu_boost = DEFAULT_GF_BOOST;
rc->baseline_gf_interval =
VPXMIN(15, (3 * rc->baseline_gf_interval) >> 1);
} else if (high_content) {
rc->gfu_boost = DEFAULT_GF_BOOST >> 1;
rc->baseline_gf_interval = (rate_err > 3.0)
? VPXMAX(10, rc->baseline_gf_interval >> 1)
: VPXMAX(6, rc->baseline_gf_interval >> 1);
}
if (rc->baseline_gf_interval > cpi->oxcf.lag_in_frames - 1)
rc->baseline_gf_interval = cpi->oxcf.lag_in_frames - 1;
// Check for constraining gf_interval for up-coming scene/content changes,
// or for up-coming key frame, whichever is closer.
frame_constraint = rc->frames_to_key;
if (rc->high_source_sad_lagindex > 0 &&
frame_constraint > rc->high_source_sad_lagindex)
frame_constraint = rc->high_source_sad_lagindex;
if (steady_sad_lagindex > 3 && frame_constraint > steady_sad_lagindex)
frame_constraint = steady_sad_lagindex;
adjust_gfint_frame_constraint(cpi, frame_constraint);
rc->frames_till_gf_update_due = rc->baseline_gf_interval;
// Adjust factors for active_worst setting & af_ratio for next gf interval.
rc->fac_active_worst_inter = 150; // corresponds to 3/2 (= 150 /100).
rc->fac_active_worst_gf = 100;
if (rate_err < 2.0 && !high_content) {
rc->fac_active_worst_inter = 120;
rc->fac_active_worst_gf = 90;
} else if (rate_err > 8.0 && rc->avg_frame_qindex[INTER_FRAME] < 16) {
// Increase active_worst faster at low Q if rate fluctuation is high.
rc->fac_active_worst_inter = 200;
if (rc->avg_frame_qindex[INTER_FRAME] < 8)
rc->fac_active_worst_inter = 400;
}
if (low_content && rc->avg_frame_low_motion > 80) {
rc->af_ratio_onepass_vbr = 15;
} else if (high_content || rc->avg_frame_low_motion < 30) {
rc->af_ratio_onepass_vbr = 5;
rc->gfu_boost = DEFAULT_GF_BOOST >> 2;
}
if (cpi->sf.use_altref_onepass && cpi->oxcf.enable_auto_arf) {
// Flag to disable usage of ARF based on past usage, only allow this
// disabling if current frame/group does not start with key frame or
// scene cut. Note perc_arf_usage is only computed for speed >= 5.
int arf_usage_low =
(cm->frame_type != KEY_FRAME && !rc->high_source_sad &&
cpi->rc.perc_arf_usage < 15 && cpi->oxcf.speed >= 5);
// Don't use alt-ref for this group under certain conditions.
if (arf_usage_low ||
(rc->high_source_sad_lagindex > 0 &&
rc->high_source_sad_lagindex <= rc->frames_till_gf_update_due) ||
(avg_source_sad_lag > 3 * sad_thresh1 >> 3)) {
rc->source_alt_ref_pending = 0;
rc->alt_ref_gf_group = 0;
} else {
rc->source_alt_ref_pending = 1;
rc->alt_ref_gf_group = 1;
// If alt-ref is used for this gf group, limit the interval.
if (rc->baseline_gf_interval > 12) {
rc->baseline_gf_interval = 12;
rc->frames_till_gf_update_due = rc->baseline_gf_interval;
}
}
}
target = calc_pframe_target_size_one_pass_vbr(cpi);
vp9_rc_set_frame_target(cpi, target);
}
rc->prev_avg_source_sad_lag = avg_source_sad_lag;
}
// Compute average source sad (temporal sad: between current source and
// previous source) over a subset of superblocks. Use this is detect big changes
// in content and allow rate control to react.
// This function also handles special case of lag_in_frames, to measure content
// level in #future frames set by the lag_in_frames.
void vp9_scene_detection_onepass(VP9_COMP *cpi) {
VP9_COMMON *const cm = &cpi->common;
RATE_CONTROL *const rc = &cpi->rc;
YV12_BUFFER_CONFIG const *unscaled_src = cpi->un_scaled_source;
YV12_BUFFER_CONFIG const *unscaled_last_src = cpi->unscaled_last_source;
uint8_t *src_y;
int src_ystride;
int src_width;
int src_height;
uint8_t *last_src_y;
int last_src_ystride;
int last_src_width;
int last_src_height;
if (cpi->un_scaled_source == NULL || cpi->unscaled_last_source == NULL ||
(cpi->use_svc && cpi->svc.current_superframe == 0))
return;
src_y = unscaled_src->y_buffer;
src_ystride = unscaled_src->y_stride;
src_width = unscaled_src->y_width;
src_height = unscaled_src->y_height;
last_src_y = unscaled_last_src->y_buffer;
last_src_ystride = unscaled_last_src->y_stride;
last_src_width = unscaled_last_src->y_width;
last_src_height = unscaled_last_src->y_height;
#if CONFIG_VP9_HIGHBITDEPTH
if (cm->use_highbitdepth) return;
#endif
rc->high_source_sad = 0;
if (cpi->svc.spatial_layer_id == 0 && src_width == last_src_width &&
src_height == last_src_height) {
YV12_BUFFER_CONFIG *frames[MAX_LAG_BUFFERS] = { NULL };
int start_frame = 0;
int frames_to_buffer = 1;
int frame = 0;
int scene_cut_force_key_frame = 0;
uint64_t avg_sad_current = 0;
uint32_t min_thresh = 4000;
float thresh = 8.0f;
uint32_t thresh_key = 140000;
if (cpi->oxcf.speed <= 5) thresh_key = 240000;
if (cpi->oxcf.rc_mode == VPX_VBR) {
min_thresh = 65000;
thresh = 2.1f;
}
if (cpi->oxcf.lag_in_frames > 0) {
frames_to_buffer = (cm->current_video_frame == 1)
? (int)vp9_lookahead_depth(cpi->lookahead) - 1
: 2;
start_frame = (int)vp9_lookahead_depth(cpi->lookahead) - 1;
for (frame = 0; frame < frames_to_buffer; ++frame) {
const int lagframe_idx = start_frame - frame;
if (lagframe_idx >= 0) {
struct lookahead_entry *buf =
vp9_lookahead_peek(cpi->lookahead, lagframe_idx);
frames[frame] = &buf->img;
}
}
// The avg_sad for this current frame is the value of frame#1
// (first future frame) from previous frame.
avg_sad_current = rc->avg_source_sad[1];
if (avg_sad_current >
VPXMAX(min_thresh,
(unsigned int)(rc->avg_source_sad[0] * thresh)) &&
cm->current_video_frame > (unsigned int)cpi->oxcf.lag_in_frames)
rc->high_source_sad = 1;
else
rc->high_source_sad = 0;
if (rc->high_source_sad && avg_sad_current > thresh_key)
scene_cut_force_key_frame = 1;
// Update recursive average for current frame.
if (avg_sad_current > 0)
rc->avg_source_sad[0] =
(3 * rc->avg_source_sad[0] + avg_sad_current) >> 2;
// Shift back data, starting at frame#1.
for (frame = 1; frame < cpi->oxcf.lag_in_frames - 1; ++frame)
rc->avg_source_sad[frame] = rc->avg_source_sad[frame + 1];
}
for (frame = 0; frame < frames_to_buffer; ++frame) {
if (cpi->oxcf.lag_in_frames == 0 ||
(frames[frame] != NULL && frames[frame + 1] != NULL &&
frames[frame]->y_width == frames[frame + 1]->y_width &&
frames[frame]->y_height == frames[frame + 1]->y_height)) {
int sbi_row, sbi_col;
const int lagframe_idx =
(cpi->oxcf.lag_in_frames == 0) ? 0 : start_frame - frame + 1;
const BLOCK_SIZE bsize = BLOCK_64X64;
// Loop over sub-sample of frame, compute average sad over 64x64 blocks.
uint64_t avg_sad = 0;
uint64_t tmp_sad = 0;
int num_samples = 0;
int sb_cols = (cm->mi_cols + MI_BLOCK_SIZE - 1) / MI_BLOCK_SIZE;
int sb_rows = (cm->mi_rows + MI_BLOCK_SIZE - 1) / MI_BLOCK_SIZE;
if (cpi->oxcf.lag_in_frames > 0) {
src_y = frames[frame]->y_buffer;
src_ystride = frames[frame]->y_stride;
last_src_y = frames[frame + 1]->y_buffer;
last_src_ystride = frames[frame + 1]->y_stride;
}
for (sbi_row = 0; sbi_row < sb_rows; ++sbi_row) {
for (sbi_col = 0; sbi_col < sb_cols; ++sbi_col) {
// Checker-board pattern, ignore boundary.
if (((sbi_row > 0 && sbi_col > 0) &&
(sbi_row < sb_rows - 1 && sbi_col < sb_cols - 1) &&
((sbi_row % 2 == 0 && sbi_col % 2 == 0) ||
(sbi_row % 2 != 0 && sbi_col % 2 != 0)))) {
tmp_sad = cpi->fn_ptr[bsize].sdf(src_y, src_ystride, last_src_y,
last_src_ystride);
avg_sad += tmp_sad;
num_samples++;
}
src_y += 64;
last_src_y += 64;
}
src_y += (src_ystride << 6) - (sb_cols << 6);
last_src_y += (last_src_ystride << 6) - (sb_cols << 6);
}
if (num_samples > 0) avg_sad = avg_sad / num_samples;
// Set high_source_sad flag if we detect very high increase in avg_sad
// between current and previous frame value(s). Use minimum threshold
// for cases where there is small change from content that is completely
// static.
if (lagframe_idx == 0) {
if (avg_sad >
VPXMAX(min_thresh,
(unsigned int)(rc->avg_source_sad[0] * thresh)) &&
rc->frames_since_key > 1)
rc->high_source_sad = 1;
else
rc->high_source_sad = 0;
if (rc->high_source_sad && avg_sad > thresh_key)
scene_cut_force_key_frame = 1;
if (avg_sad > 0 || cpi->oxcf.rc_mode == VPX_CBR)
rc->avg_source_sad[0] = (3 * rc->avg_source_sad[0] + avg_sad) >> 2;
} else {
rc->avg_source_sad[lagframe_idx] = avg_sad;
}
}
}
// For CBR non-screen content mode, check if we should reset the rate
// control. Reset is done if high_source_sad is detected and the rate
// control is at very low QP with rate correction factor at min level.
if (cpi->oxcf.rc_mode == VPX_CBR &&
cpi->oxcf.content != VP9E_CONTENT_SCREEN && !cpi->use_svc) {
if (rc->high_source_sad && rc->last_q[INTER_FRAME] == rc->best_quality &&
rc->avg_frame_qindex[INTER_FRAME] < (rc->best_quality << 1) &&
rc->rate_correction_factors[INTER_NORMAL] == MIN_BPB_FACTOR) {
rc->rate_correction_factors[INTER_NORMAL] = 0.5;
rc->avg_frame_qindex[INTER_FRAME] = rc->worst_quality;
rc->buffer_level = rc->optimal_buffer_level;
rc->bits_off_target = rc->optimal_buffer_level;
rc->reset_high_source_sad = 1;
}
if (cm->frame_type != KEY_FRAME && rc->reset_high_source_sad)
rc->this_frame_target = rc->avg_frame_bandwidth;
}
// For SVC the new (updated) avg_source_sad[0] for the current superframe
// updates the setting for all layers.
if (cpi->use_svc) {
int sl, tl;
SVC *const svc = &cpi->svc;
for (sl = 0; sl < svc->number_spatial_layers; ++sl)
for (tl = 0; tl < svc->number_temporal_layers; ++tl) {
int layer = LAYER_IDS_TO_IDX(sl, tl, svc->number_temporal_layers);
LAYER_CONTEXT *const lc = &svc->layer_context[layer];
RATE_CONTROL *const lrc = &lc->rc;
lrc->avg_source_sad[0] = rc->avg_source_sad[0];
}
}
// For VBR, under scene change/high content change, force golden refresh.
if (cpi->oxcf.rc_mode == VPX_VBR && cm->frame_type != KEY_FRAME &&
rc->high_source_sad && rc->frames_to_key > 3 &&
rc->count_last_scene_change > 4 &&
cpi->ext_refresh_frame_flags_pending == 0) {
int target;
cpi->refresh_golden_frame = 1;
if (scene_cut_force_key_frame) cm->frame_type = KEY_FRAME;
rc->source_alt_ref_pending = 0;
if (cpi->sf.use_altref_onepass && cpi->oxcf.enable_auto_arf)
rc->source_alt_ref_pending = 1;
rc->gfu_boost = DEFAULT_GF_BOOST >> 1;
rc->baseline_gf_interval =
VPXMIN(20, VPXMAX(10, rc->baseline_gf_interval));
adjust_gfint_frame_constraint(cpi, rc->frames_to_key);
rc->frames_till_gf_update_due = rc->baseline_gf_interval;
target = calc_pframe_target_size_one_pass_vbr(cpi);
vp9_rc_set_frame_target(cpi, target);
rc->count_last_scene_change = 0;
} else {
rc->count_last_scene_change++;
}
// If lag_in_frame is used, set the gf boost and interval.
if (cpi->oxcf.lag_in_frames > 0)
adjust_gf_boost_lag_one_pass_vbr(cpi, avg_sad_current);
}
}
// Test if encoded frame will significantly overshoot the target bitrate, and
// if so, set the QP, reset/adjust some rate control parameters, and return 1.
int vp9_encodedframe_overshoot(VP9_COMP *cpi, int frame_size, int *q) {
VP9_COMMON *const cm = &cpi->common;
RATE_CONTROL *const rc = &cpi->rc;
int thresh_qp = 7 * (rc->worst_quality >> 3);
int thresh_rate = rc->avg_frame_bandwidth << 3;
// Lower rate threshold for video.
if (cpi->oxcf.content != VP9E_CONTENT_SCREEN)
thresh_rate = rc->avg_frame_bandwidth << 2;
if (cm->base_qindex < thresh_qp && frame_size > thresh_rate) {
double rate_correction_factor =
cpi->rc.rate_correction_factors[INTER_NORMAL];
const int target_size = cpi->rc.avg_frame_bandwidth;
double new_correction_factor;
int target_bits_per_mb;
double q2;
int enumerator;
// Force a re-encode, and for now use max-QP.
*q = cpi->rc.worst_quality;
// Adjust avg_frame_qindex, buffer_level, and rate correction factors, as
// these parameters will affect QP selection for subsequent frames. If they
// have settled down to a very different (low QP) state, then not adjusting
// them may cause next frame to select low QP and overshoot again.
cpi->rc.avg_frame_qindex[INTER_FRAME] = *q;
rc->buffer_level = rc->optimal_buffer_level;
rc->bits_off_target = rc->optimal_buffer_level;
// Reset rate under/over-shoot flags.
cpi->rc.rc_1_frame = 0;
cpi->rc.rc_2_frame = 0;
// Adjust rate correction factor.
target_bits_per_mb =
(int)(((uint64_t)target_size << BPER_MB_NORMBITS) / cm->MBs);
// Rate correction factor based on target_bits_per_mb and qp (==max_QP).
// This comes from the inverse computation of vp9_rc_bits_per_mb().
q2 = vp9_convert_qindex_to_q(*q, cm->bit_depth);
enumerator = 1800000; // Factor for inter frame.
enumerator += (int)(enumerator * q2) >> 12;
new_correction_factor = (double)target_bits_per_mb * q2 / enumerator;
if (new_correction_factor > rate_correction_factor) {
rate_correction_factor =
VPXMIN(2.0 * rate_correction_factor, new_correction_factor);
if (rate_correction_factor > MAX_BPB_FACTOR)
rate_correction_factor = MAX_BPB_FACTOR;
cpi->rc.rate_correction_factors[INTER_NORMAL] = rate_correction_factor;
}
// For temporal layers, reset the rate control parametes across all
// temporal layers.
if (cpi->use_svc) {
int i = 0;
SVC *svc = &cpi->svc;
for (i = 0; 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];
RATE_CONTROL *lrc = &lc->rc;
lrc->avg_frame_qindex[INTER_FRAME] = *q;
lrc->buffer_level = rc->optimal_buffer_level;
lrc->bits_off_target = rc->optimal_buffer_level;
lrc->rc_1_frame = 0;
lrc->rc_2_frame = 0;
lrc->rate_correction_factors[INTER_NORMAL] = rate_correction_factor;
}
}
return 1;
} else {
return 0;
}
}