An error occurred while loading the file. Please try again.
-
Dmitry Kovalev authored
Change-Id: Id63e114a8f0615dbafd6a816019cdebffb983d2c
d6b8709e
vp9_ratectrl.c 53.11 KiB
/* * 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_mem/vpx_mem.h"#include "vp9/common/vp9_alloccommon.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/common/vp9_systemdependent.h"#include "vp9/encoder/vp9_encodemv.h"#include "vp9/encoder/vp9_ratectrl.h"#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// Bits Per MB at different Q (Multiplied by 512)#define BPER_MB_NORMBITS 9// Tables relating active max Q to active min Qstatic int kf_low_motion_minq[QINDEX_RANGE];static int kf_high_motion_minq[QINDEX_RANGE];static int gf_low_motion_minq[QINDEX_RANGE];static int gf_high_motion_minq[QINDEX_RANGE];static int inter_minq[QINDEX_RANGE];static int afq_low_motion_minq[QINDEX_RANGE];static int afq_high_motion_minq[QINDEX_RANGE];static int gf_high = 2000;static int gf_low = 400;static int kf_high = 5000;static int kf_low = 400;// Functions to compute the active minq lookup table entries based on a// formulaic approach to facilitate easier adjustment of the Q tables.// The formulae were derived from computing a 3rd order polynomial best// fit to the original data (after plotting real maxq vs minq (not q index))static int calculate_minq_index(double maxq, double x3, double x2, double x1, double c) { int i; const double minqtarget = MIN(((x3 * maxq + x2) * maxq + x1) * maxq + c, 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))7172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140
return i;
}
return QINDEX_RANGE - 1;
}
void vp9_rc_init_minq_luts(void) {
int i;
for (i = 0; i < QINDEX_RANGE; i++) {
const double maxq = vp9_convert_qindex_to_q(i);
kf_low_motion_minq[i] = calculate_minq_index(maxq,
0.000001,
-0.0004,
0.15,
0.0);
kf_high_motion_minq[i] = calculate_minq_index(maxq,
0.000002,
-0.0012,
0.50,
0.0);
gf_low_motion_minq[i] = calculate_minq_index(maxq,
0.0000015,
-0.0009,
0.32,
0.0);
gf_high_motion_minq[i] = calculate_minq_index(maxq,
0.0000021,
-0.00125,
0.50,
0.0);
afq_low_motion_minq[i] = calculate_minq_index(maxq,
0.0000015,
-0.0009,
0.33,
0.0);
afq_high_motion_minq[i] = calculate_minq_index(maxq,
0.0000021,
-0.00125,
0.55,
0.0);
inter_minq[i] = calculate_minq_index(maxq,
0.00000271,
-0.00113,
0.75,
0.0);
}
}
// 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) {
// Convert the index to a real Q value (scaled down to match old Q values)
return vp9_ac_quant(qindex, 0) / 4.0;
}
int vp9_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex,
double correction_factor) {
const double q = vp9_convert_qindex_to_q(qindex);
int enumerator = frame_type == KEY_FRAME ? 3300000 : 2250000;
// q based adjustment to baseline enumerator
enumerator += (int)(enumerator * q) >> 12;
return (int)(0.5 + (enumerator * correction_factor / q));
}
141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210
void vp9_save_coding_context(VP9_COMP *cpi) {
CODING_CONTEXT *const cc = &cpi->coding_context;
VP9_COMMON *cm = &cpi->common;
// Stores a snapshot of key state variables which can subsequently be
// restored with a call to vp9_restore_coding_context. These functions are
// intended for use in a re-code loop in vp9_compress_frame where the
// quantizer value is adjusted between loop iterations.
vp9_copy(cc->nmvjointcost, cpi->mb.nmvjointcost);
vp9_copy(cc->nmvcosts, cpi->mb.nmvcosts);
vp9_copy(cc->nmvcosts_hp, cpi->mb.nmvcosts_hp);
vp9_copy(cc->segment_pred_probs, cm->seg.pred_probs);
vpx_memcpy(cpi->coding_context.last_frame_seg_map_copy,
cm->last_frame_seg_map, (cm->mi_rows * cm->mi_cols));
vp9_copy(cc->last_ref_lf_deltas, cm->lf.last_ref_deltas);
vp9_copy(cc->last_mode_lf_deltas, cm->lf.last_mode_deltas);
cc->fc = cm->fc;
}
void vp9_restore_coding_context(VP9_COMP *cpi) {
CODING_CONTEXT *const cc = &cpi->coding_context;
VP9_COMMON *cm = &cpi->common;
// Restore key state variables to the snapshot state stored in the
// previous call to vp9_save_coding_context.
vp9_copy(cpi->mb.nmvjointcost, cc->nmvjointcost);
vp9_copy(cpi->mb.nmvcosts, cc->nmvcosts);
vp9_copy(cpi->mb.nmvcosts_hp, cc->nmvcosts_hp);
vp9_copy(cm->seg.pred_probs, cc->segment_pred_probs);
vpx_memcpy(cm->last_frame_seg_map,
cpi->coding_context.last_frame_seg_map_copy,
(cm->mi_rows * cm->mi_cols));
vp9_copy(cm->lf.last_ref_deltas, cc->last_ref_lf_deltas);
vp9_copy(cm->lf.last_mode_deltas, cc->last_mode_lf_deltas);
cm->fc = cc->fc;
}
void vp9_setup_key_frame(VP9_COMP *cpi) {
VP9_COMMON *cm = &cpi->common;
vp9_setup_past_independence(cm);
/* All buffers are implicitly updated on key frames. */
cpi->refresh_golden_frame = 1;
cpi->refresh_alt_ref_frame = 1;
}
void vp9_setup_inter_frame(VP9_COMP *cpi) {
VP9_COMMON *cm = &cpi->common;
if (cm->error_resilient_mode || cm->intra_only)
vp9_setup_past_independence(cm);
assert(cm->frame_context_idx < FRAME_CONTEXTS);
cm->fc = cm->frame_contexts[cm->frame_context_idx];
}
static int estimate_bits_at_q(int frame_kind, int q, int mbs,
double correction_factor) {
const int bpm = (int)(vp9_rc_bits_per_mb(frame_kind, q, correction_factor));
// Attempt to retain reasonable accuracy without overflow. The cutoff is
// chosen such that the maximum product of Bpm and MBs fits 31 bits. The
211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280
// largest Bpm takes 20 bits.
return (mbs > (1 << 11)) ? (bpm >> BPER_MB_NORMBITS) * mbs
: (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 int min_frame_target = MAX(rc->min_frame_bandwidth,
rc->av_per_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;
return target;
}
int vp9_rc_clamp_iframe_target_size(const VP9_COMP *const cpi, int target) {
const RATE_CONTROL *rc = &cpi->rc;
const VP9_CONFIG *oxcf = &cpi->oxcf;
if (oxcf->rc_max_intra_bitrate_pct) {
const int max_rate = rc->av_per_frame_bandwidth *
oxcf->rc_max_intra_bitrate_pct / 100;
target = MIN(target, max_rate);
}
if (target > rc->max_frame_bandwidth)
target = rc->max_frame_bandwidth;
return target;
}
// Update the buffer level for higher layers, given the encoded current layer.
static void update_layer_buffer_level(VP9_COMP *const cpi,
int encoded_frame_size) {
int temporal_layer = 0;
int current_temporal_layer = cpi->svc.temporal_layer_id;
for (temporal_layer = current_temporal_layer + 1;
temporal_layer < cpi->svc.number_temporal_layers; ++temporal_layer) {
LAYER_CONTEXT *lc = &cpi->svc.layer_context[temporal_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 = MIN(lrc->bits_off_target, lc->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;
const VP9_CONFIG *oxcf = &cpi->oxcf;
RATE_CONTROL *const rc = &cpi->rc;
// 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->av_per_frame_bandwidth - encoded_frame_size;
}
281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350
// Clip the buffer level to the maximum specified buffer size.
rc->bits_off_target = MIN(rc->bits_off_target, oxcf->maximum_buffer_size);
rc->buffer_level = rc->bits_off_target;
if (cpi->use_svc && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) {
update_layer_buffer_level(cpi, encoded_frame_size);
}
}
int vp9_rc_drop_frame(VP9_COMP *cpi) {
const VP9_CONFIG *oxcf = &cpi->oxcf;
RATE_CONTROL *const rc = &cpi->rc;
if (!oxcf->drop_frames_water_mark) {
return 0;
} else {
if (rc->buffer_level < 0) {
// Always drop if buffer is below 0.
return 1;
} else {
// If buffer is below drop_mark, for now just drop every other frame
// (starting with the next frame) until it increases back over drop_mark.
int drop_mark = (int)(oxcf->drop_frames_water_mark *
oxcf->optimal_buffer_level / 100);
if ((rc->buffer_level > drop_mark) &&
(rc->decimation_factor > 0)) {
--rc->decimation_factor;
} else if (rc->buffer_level <= drop_mark &&
rc->decimation_factor == 0) {
rc->decimation_factor = 1;
}
if (rc->decimation_factor > 0) {
if (rc->decimation_count > 0) {
--rc->decimation_count;
return 1;
} else {
rc->decimation_count = rc->decimation_factor;
return 0;
}
} else {
rc->decimation_count = 0;
return 0;
}
}
}
}
static double get_rate_correction_factor(const VP9_COMP *cpi) {
if (cpi->common.frame_type == KEY_FRAME) {
return cpi->rc.key_frame_rate_correction_factor;
} else {
if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
!(cpi->use_svc && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER))
return cpi->rc.gf_rate_correction_factor;
else
return cpi->rc.rate_correction_factor;
}
}
static void set_rate_correction_factor(VP9_COMP *cpi, double factor) {
if (cpi->common.frame_type == KEY_FRAME) {
cpi->rc.key_frame_rate_correction_factor = factor;
} else {
if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) &&
!(cpi->use_svc && cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER))
cpi->rc.gf_rate_correction_factor = factor;
else
cpi->rc.rate_correction_factor = factor;
}
}
351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420
void vp9_rc_update_rate_correction_factors(VP9_COMP *cpi, int damp_var) {
const int q = cpi->common.base_qindex;
int correction_factor = 100;
double rate_correction_factor = get_rate_correction_factor(cpi);
double adjustment_limit;
int projected_size_based_on_q = 0;
// Clear down mmx registers to allow floating point in what follows
vp9_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
projected_size_based_on_q = estimate_bits_at_q(cpi->common.frame_type, q,
cpi->common.MBs,
rate_correction_factor);
// Work out a size correction factor.
if (projected_size_based_on_q > 0)
correction_factor = (100 * cpi->rc.projected_frame_size) /
projected_size_based_on_q;
// More heavily damped adjustment used if we have been oscillating either side
// of target.
switch (damp_var) {
case 0:
adjustment_limit = 0.75;
break;
case 1:
adjustment_limit = 0.375;
break;
case 2:
default:
adjustment_limit = 0.25;
break;
}
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;
int q = active_worst_quality;
int last_error = INT_MAX;
int i, target_bits_per_mb;
421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490
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.
if (target_bits_per_frame >= (INT_MAX >> BPER_MB_NORMBITS))
// Case where we would overflow int
target_bits_per_mb = (target_bits_per_frame / cm->MBs) << BPER_MB_NORMBITS;
else
target_bits_per_mb = (target_bits_per_frame << BPER_MB_NORMBITS) / cm->MBs;
i = active_best_quality;
do {
const int bits_per_mb_at_this_q = (int)vp9_rc_bits_per_mb(cm->frame_type, i,
correction_factor);
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);
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 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] * 2;
} else {
if (!rc->is_src_frame_alt_ref &&
(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 5 / 4
: rc->last_q[INTER_FRAME];
} else {
active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 2
: rc->last_q[INTER_FRAME] * 2;
}
}
return MIN(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) {
491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560
// 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_CONFIG *oxcf = &cpi->oxcf;
const RATE_CONTROL *rc = &cpi->rc;
// Buffer level below which we push active_worst to worst_quality.
int64_t critical_level = oxcf->optimal_buffer_level >> 2;
int64_t buff_lvl_step = 0;
int adjustment = 0;
int active_worst_quality;
if (cpi->common.frame_type == KEY_FRAME)
return rc->worst_quality;
if (cpi->common.current_video_frame > 1)
active_worst_quality = MIN(rc->worst_quality,
rc->avg_frame_qindex[INTER_FRAME] * 5 / 4);
else
active_worst_quality = MIN(rc->worst_quality,
rc->avg_frame_qindex[KEY_FRAME] * 3 / 2);
if (rc->buffer_level > oxcf->optimal_buffer_level) {
// Adjust down.
// Maximum limit for down adjustment, ~30%.
int max_adjustment_down = active_worst_quality / 3;
if (max_adjustment_down) {
buff_lvl_step = ((oxcf->maximum_buffer_size -
oxcf->optimal_buffer_level) / max_adjustment_down);
if (buff_lvl_step)
adjustment = (int)((rc->buffer_level - oxcf->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 = (oxcf->optimal_buffer_level - critical_level);
if (buff_lvl_step) {
adjustment =
(int)((rc->worst_quality - rc->avg_frame_qindex[INTER_FRAME]) *
(oxcf->optimal_buffer_level - rc->buffer_level) /
buff_lvl_step);
}
active_worst_quality = rc->avg_frame_qindex[INTER_FRAME] + 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;
if (frame_is_intra_only(cm)) {
active_best_quality = rc->best_quality;
// Handle the special case for key frames forced when we have75 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);
int delta_qindex = vp9_compute_qdelta(cpi, last_boosted_q,
(last_boosted_q * 0.75));
561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630
active_best_quality = MAX(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_active_quality(rc->avg_frame_qindex[KEY_FRAME],
rc->kf_boost,
kf_low, kf_high,
kf_low_motion_minq,
kf_high_motion_minq);
// 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);
active_best_quality += vp9_compute_qdelta(cpi, q_val, q_val *
q_adj_factor);
}
} 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_active_quality(
q, rc->gfu_boost, gf_low, gf_high,
gf_low_motion_minq, gf_high_motion_minq);
} 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 = inter_minq[rc->avg_frame_qindex[INTER_FRAME]];
else
active_best_quality = inter_minq[active_worst_quality];
} else {
if (rc->avg_frame_qindex[KEY_FRAME] < active_worst_quality)
active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]];
else
active_best_quality = inter_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;
#if LIMIT_QRANGE_FOR_ALTREF_AND_KEY
// Limit Q range for the adaptive loop.
if (cm->frame_type == KEY_FRAME && !rc->this_key_frame_forced) {
if (!(cm->current_video_frame == 0))
*top_index = (active_worst_quality + active_best_quality * 3) / 4;
}
#endif
// Special case code to try and match quality with forced key frames
631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700
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 (cpi->rc.this_frame_target >= cpi->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 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 VP9_CONFIG *const oxcf = &cpi->oxcf;
int active_best_quality;
int active_worst_quality = calc_active_worst_quality_one_pass_vbr(cpi);
int q;
if (frame_is_intra_only(cm)) {
active_best_quality = rc->best_quality;
#if !CONFIG_MULTIPLE_ARF
// Handle the special case for key frames forced when we have75 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);
int delta_qindex = vp9_compute_qdelta(cpi, last_boosted_q,
(last_boosted_q * 0.75));
active_best_quality = MAX(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_active_quality(rc->avg_frame_qindex[KEY_FRAME],
rc->kf_boost,
kf_low, kf_high,
kf_low_motion_minq,
kf_high_motion_minq);
// 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);
active_best_quality += vp9_compute_qdelta(cpi, q_val, q_val *
q_adj_factor);
}
#else
double current_q;
// Force the KF quantizer to be 30% of the active_worst_quality.
current_q = vp9_convert_qindex_to_q(active_worst_quality);
active_best_quality = active_worst_quality
701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770
+ vp9_compute_qdelta(cpi, current_q, current_q * 0.3);
#endif
} else if (!rc->is_src_frame_alt_ref &&
(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) {
// Use the lower of active_worst_quality and recent
// average Q as basis for GF/ARF best Q limit unless last frame was
// a key frame.
if (rc->frames_since_key > 1 &&
rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) {
q = rc->avg_frame_qindex[INTER_FRAME];
} else {
q = rc->avg_frame_qindex[KEY_FRAME];
}
// For constrained quality dont allow Q less than the cq level
if (oxcf->end_usage == USAGE_CONSTRAINED_QUALITY) {
if (q < cpi->cq_target_quality)
q = cpi->cq_target_quality;
if (rc->frames_since_key > 1) {
active_best_quality = get_active_quality(q, rc->gfu_boost,
gf_low, gf_high,
afq_low_motion_minq,
afq_high_motion_minq);
} else {
active_best_quality = get_active_quality(q, rc->gfu_boost,
gf_low, gf_high,
gf_low_motion_minq,
gf_high_motion_minq);
}
// Constrained quality use slightly lower active best.
active_best_quality = active_best_quality * 15 / 16;
} else if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
if (!cpi->refresh_alt_ref_frame) {
active_best_quality = cpi->cq_target_quality;
} else {
if (rc->frames_since_key > 1) {
active_best_quality = get_active_quality(
q, rc->gfu_boost, gf_low, gf_high,
afq_low_motion_minq, afq_high_motion_minq);
} else {
active_best_quality = get_active_quality(
q, rc->gfu_boost, gf_low, gf_high,
gf_low_motion_minq, gf_high_motion_minq);
}
}
} else {
active_best_quality = get_active_quality(
q, rc->gfu_boost, gf_low, gf_high,
gf_low_motion_minq, gf_high_motion_minq);
}
} else {
if (oxcf->end_usage == USAGE_CONSTANT_QUALITY) {
active_best_quality = cpi->cq_target_quality;
} else {
// Use the lower of active_worst_quality and recent/average Q.
if (cm->current_video_frame > 1)
active_best_quality = inter_minq[rc->avg_frame_qindex[INTER_FRAME]];
else
active_best_quality = inter_minq[rc->avg_frame_qindex[KEY_FRAME]];
// For the constrained quality mode we don't want
// q to fall below the cq level.
if ((oxcf->end_usage == USAGE_CONSTRAINED_QUALITY) &&
(active_best_quality < cpi->cq_target_quality)) {
// If we are strongly undershooting the target rate in the last
// frames then use the user passed in cq value not the auto
// cq value.
if (rc->rolling_actual_bits < rc->min_frame_bandwidth)
active_best_quality = oxcf->cq_level;
else
active_best_quality = cpi->cq_target_quality;