ref: df0d3a415216340a44953c6ed936bc2a4d7a1175
dir: /vp8/vp8_ratectrl_rtc.cc/
/*
* Copyright (c) 2021 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 <math.h>
#include <new>
#include "vp8/vp8_ratectrl_rtc.h"
#include "vp8/encoder/ratectrl.h"
#include "vpx_ports/system_state.h"
namespace libvpx {
/* Quant MOD */
static const int kQTrans[] = {
0, 1, 2, 3, 4, 5, 7, 8, 9, 10, 12, 13, 15, 17, 18, 19,
20, 21, 23, 24, 25, 26, 27, 28, 29, 30, 31, 33, 35, 37, 39, 41,
43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 64, 67, 70, 73, 76, 79,
82, 85, 88, 91, 94, 97, 100, 103, 106, 109, 112, 115, 118, 121, 124, 127,
};
static const unsigned char kf_high_motion_minq[QINDEX_RANGE] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1,
1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5,
5, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 8, 8, 8, 8, 9, 9, 10, 10,
10, 10, 11, 11, 11, 11, 12, 12, 13, 13, 13, 13, 14, 14, 15, 15, 15, 15, 16,
16, 16, 16, 17, 17, 18, 18, 18, 18, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21,
22, 22, 23, 23, 24, 25, 25, 26, 26, 27, 28, 28, 29, 30
};
static const unsigned char inter_minq[QINDEX_RANGE] = {
0, 0, 1, 1, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 9, 10, 11,
11, 12, 13, 13, 14, 15, 15, 16, 17, 17, 18, 19, 20, 20, 21, 22, 22, 23, 24,
24, 25, 26, 27, 27, 28, 29, 30, 30, 31, 32, 33, 33, 34, 35, 36, 36, 37, 38,
39, 39, 40, 41, 42, 42, 43, 44, 45, 46, 46, 47, 48, 49, 50, 50, 51, 52, 53,
54, 55, 55, 56, 57, 58, 59, 60, 60, 61, 62, 63, 64, 65, 66, 67, 67, 68, 69,
70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 86,
87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100
};
static int rescale(int val, int num, int denom) {
int64_t llnum = num;
int64_t llden = denom;
int64_t llval = val;
return (int)(llval * llnum / llden);
}
std::unique_ptr<VP8RateControlRTC> VP8RateControlRTC::Create(
const VP8RateControlRtcConfig &cfg) {
std::unique_ptr<VP8RateControlRTC> rc_api(new (std::nothrow)
VP8RateControlRTC());
if (!rc_api) return nullptr;
rc_api->cpi_ = static_cast<VP8_COMP *>(vpx_memalign(32, sizeof(*cpi_)));
if (!rc_api->cpi_) return nullptr;
vp8_zero(*rc_api->cpi_);
rc_api->InitRateControl(cfg);
return rc_api;
}
void VP8RateControlRTC::InitRateControl(const VP8RateControlRtcConfig &rc_cfg) {
VP8_COMMON *cm = &cpi_->common;
VP8_CONFIG *oxcf = &cpi_->oxcf;
oxcf->end_usage = USAGE_STREAM_FROM_SERVER;
cpi_->pass = 0;
cm->show_frame = 1;
oxcf->drop_frames_water_mark = 0;
cm->current_video_frame = 0;
cpi_->auto_gold = 1;
cpi_->key_frame_count = 1;
cpi_->rate_correction_factor = 1.0;
cpi_->key_frame_rate_correction_factor = 1.0;
cpi_->cyclic_refresh_mode_enabled = 0;
cpi_->auto_worst_q = 1;
cpi_->kf_overspend_bits = 0;
cpi_->kf_bitrate_adjustment = 0;
cpi_->gf_overspend_bits = 0;
cpi_->non_gf_bitrate_adjustment = 0;
UpdateRateControl(rc_cfg);
cpi_->buffer_level = oxcf->starting_buffer_level;
cpi_->bits_off_target = oxcf->starting_buffer_level;
}
void VP8RateControlRTC::UpdateRateControl(
const VP8RateControlRtcConfig &rc_cfg) {
VP8_COMMON *cm = &cpi_->common;
VP8_CONFIG *oxcf = &cpi_->oxcf;
vpx_clear_system_state();
cm->Width = rc_cfg.width;
cm->Height = rc_cfg.height;
oxcf->Width = rc_cfg.width;
oxcf->Height = rc_cfg.height;
oxcf->worst_allowed_q = kQTrans[rc_cfg.max_quantizer];
oxcf->best_allowed_q = kQTrans[rc_cfg.min_quantizer];
cpi_->worst_quality = oxcf->worst_allowed_q;
cpi_->best_quality = oxcf->best_allowed_q;
cpi_->output_framerate = rc_cfg.framerate;
oxcf->target_bandwidth =
static_cast<unsigned int>(1000 * rc_cfg.target_bandwidth);
cpi_->ref_framerate = cpi_->output_framerate;
oxcf->fixed_q = -1;
oxcf->error_resilient_mode = 1;
oxcf->starting_buffer_level_in_ms = rc_cfg.buf_initial_sz;
oxcf->optimal_buffer_level_in_ms = rc_cfg.buf_optimal_sz;
oxcf->maximum_buffer_size_in_ms = rc_cfg.buf_sz;
oxcf->starting_buffer_level = rc_cfg.buf_initial_sz;
oxcf->optimal_buffer_level = rc_cfg.buf_optimal_sz;
oxcf->maximum_buffer_size = rc_cfg.buf_sz;
oxcf->number_of_layers = rc_cfg.ts_number_layers;
cpi_->buffered_mode = oxcf->optimal_buffer_level > 0;
oxcf->under_shoot_pct = rc_cfg.undershoot_pct;
oxcf->over_shoot_pct = rc_cfg.overshoot_pct;
cpi_->oxcf.rc_max_intra_bitrate_pct = rc_cfg.max_intra_bitrate_pct;
cpi_->framerate = rc_cfg.framerate;
for (int i = 0; i < KEY_FRAME_CONTEXT; ++i) {
cpi_->prior_key_frame_distance[i] =
static_cast<int>(cpi_->output_framerate);
}
if (oxcf->number_of_layers > 1) {
memcpy(oxcf->target_bitrate, rc_cfg.layer_target_bitrate,
sizeof(rc_cfg.layer_target_bitrate));
memcpy(oxcf->rate_decimator, rc_cfg.ts_rate_decimator,
sizeof(rc_cfg.ts_rate_decimator));
oxcf->periodicity = 2;
double prev_layer_framerate = 0;
for (unsigned int i = 0; i < oxcf->number_of_layers; ++i) {
vp8_init_temporal_layer_context(cpi_, oxcf, i, prev_layer_framerate);
prev_layer_framerate = cpi_->output_framerate / oxcf->rate_decimator[i];
}
}
cpi_->total_actual_bits = 0;
cpi_->total_target_vs_actual = 0;
cm->mb_rows = cm->Height >> 4;
cm->mb_cols = cm->Width >> 4;
cm->MBs = cm->mb_rows * cm->mb_cols;
cm->mode_info_stride = cm->mb_cols + 1;
oxcf->starting_buffer_level =
rescale((int)oxcf->starting_buffer_level, oxcf->target_bandwidth, 1000);
/* Set or reset optimal and maximum buffer levels. */
if (oxcf->optimal_buffer_level == 0) {
oxcf->optimal_buffer_level = oxcf->target_bandwidth / 8;
} else {
oxcf->optimal_buffer_level =
rescale((int)oxcf->optimal_buffer_level, oxcf->target_bandwidth, 1000);
}
if (oxcf->maximum_buffer_size == 0) {
oxcf->maximum_buffer_size = oxcf->target_bandwidth / 8;
} else {
oxcf->maximum_buffer_size =
rescale((int)oxcf->maximum_buffer_size, oxcf->target_bandwidth, 1000);
}
if (cpi_->bits_off_target > oxcf->maximum_buffer_size) {
cpi_->bits_off_target = oxcf->maximum_buffer_size;
cpi_->buffer_level = cpi_->bits_off_target;
}
vp8_new_framerate(cpi_, cpi_->framerate);
vpx_clear_system_state();
}
void VP8RateControlRTC::ComputeQP(const VP8FrameParamsQpRTC &frame_params) {
VP8_COMMON *const cm = &cpi_->common;
vpx_clear_system_state();
if (cpi_->oxcf.number_of_layers > 1) {
cpi_->temporal_layer_id = frame_params.temporal_layer_id;
const int layer = frame_params.temporal_layer_id;
vp8_update_layer_contexts(cpi_);
/* Restore layer specific context & set frame rate */
vp8_restore_layer_context(cpi_, layer);
vp8_new_framerate(cpi_, cpi_->layer_context[layer].framerate);
}
cm->frame_type = frame_params.frame_type;
cm->refresh_golden_frame = (cm->frame_type == KEY_FRAME) ? 1 : 0;
cm->refresh_alt_ref_frame = (cm->frame_type == KEY_FRAME) ? 1 : 0;
if (cm->frame_type == KEY_FRAME && cpi_->common.current_video_frame > 0) {
cpi_->common.frame_flags |= FRAMEFLAGS_KEY;
}
vp8_pick_frame_size(cpi_);
if (cpi_->buffer_level >= cpi_->oxcf.optimal_buffer_level &&
cpi_->buffered_mode) {
/* Max adjustment is 1/4 */
int Adjustment = cpi_->active_worst_quality / 4;
if (Adjustment) {
int buff_lvl_step;
if (cpi_->buffer_level < cpi_->oxcf.maximum_buffer_size) {
buff_lvl_step = (int)((cpi_->oxcf.maximum_buffer_size -
cpi_->oxcf.optimal_buffer_level) /
Adjustment);
if (buff_lvl_step) {
Adjustment =
(int)((cpi_->buffer_level - cpi_->oxcf.optimal_buffer_level) /
buff_lvl_step);
} else {
Adjustment = 0;
}
}
cpi_->active_worst_quality -= Adjustment;
if (cpi_->active_worst_quality < cpi_->active_best_quality) {
cpi_->active_worst_quality = cpi_->active_best_quality;
}
}
}
if (cpi_->ni_frames > 150) {
int q = cpi_->active_worst_quality;
if (cm->frame_type == KEY_FRAME) {
cpi_->active_best_quality = kf_high_motion_minq[q];
} else {
cpi_->active_best_quality = inter_minq[q];
}
if (cpi_->buffer_level >= cpi_->oxcf.maximum_buffer_size) {
cpi_->active_best_quality = cpi_->best_quality;
} else if (cpi_->buffer_level > cpi_->oxcf.optimal_buffer_level) {
int Fraction =
(int)(((cpi_->buffer_level - cpi_->oxcf.optimal_buffer_level) * 128) /
(cpi_->oxcf.maximum_buffer_size -
cpi_->oxcf.optimal_buffer_level));
int min_qadjustment =
((cpi_->active_best_quality - cpi_->best_quality) * Fraction) / 128;
cpi_->active_best_quality -= min_qadjustment;
}
}
/* Clip the active best and worst quality values to limits */
if (cpi_->active_worst_quality > cpi_->worst_quality) {
cpi_->active_worst_quality = cpi_->worst_quality;
}
if (cpi_->active_best_quality < cpi_->best_quality) {
cpi_->active_best_quality = cpi_->best_quality;
}
if (cpi_->active_worst_quality < cpi_->active_best_quality) {
cpi_->active_worst_quality = cpi_->active_best_quality;
}
q_ = vp8_regulate_q(cpi_, cpi_->this_frame_target);
vp8_set_quantizer(cpi_, q_);
vpx_clear_system_state();
}
int VP8RateControlRTC::GetQP() const { return q_; }
void VP8RateControlRTC::PostEncodeUpdate(uint64_t encoded_frame_size) {
VP8_COMMON *const cm = &cpi_->common;
vpx_clear_system_state();
cpi_->total_byte_count += encoded_frame_size;
cpi_->projected_frame_size = static_cast<int>(encoded_frame_size << 3);
if (cpi_->oxcf.number_of_layers > 1) {
for (unsigned int i = cpi_->current_layer + 1;
i < cpi_->oxcf.number_of_layers; ++i) {
cpi_->layer_context[i].total_byte_count += encoded_frame_size;
}
}
vp8_update_rate_correction_factors(cpi_, 2);
cpi_->last_q[cm->frame_type] = cm->base_qindex;
if (cm->frame_type == KEY_FRAME) {
vp8_adjust_key_frame_context(cpi_);
}
/* Keep a record of ambient average Q. */
if (cm->frame_type != KEY_FRAME) {
cpi_->avg_frame_qindex =
(2 + 3 * cpi_->avg_frame_qindex + cm->base_qindex) >> 2;
}
/* Keep a record from which we can calculate the average Q excluding
* key frames.
*/
if (cm->frame_type != KEY_FRAME) {
cpi_->ni_frames++;
/* Damp value for first few frames */
if (cpi_->ni_frames > 150) {
cpi_->ni_tot_qi += q_;
cpi_->ni_av_qi = (cpi_->ni_tot_qi / cpi_->ni_frames);
} else {
cpi_->ni_tot_qi += q_;
cpi_->ni_av_qi =
((cpi_->ni_tot_qi / cpi_->ni_frames) + cpi_->worst_quality + 1) / 2;
}
/* If the average Q is higher than what was used in the last
* frame (after going through the recode loop to keep the frame
* size within range) then use the last frame value - 1. The -1
* is designed to stop Q and hence the data rate, from
* progressively falling away during difficult sections, but at
* the same time reduce the number of itterations around the
* recode loop.
*/
if (q_ > cpi_->ni_av_qi) cpi_->ni_av_qi = q_ - 1;
}
cpi_->bits_off_target +=
cpi_->av_per_frame_bandwidth - cpi_->projected_frame_size;
if (cpi_->bits_off_target > cpi_->oxcf.maximum_buffer_size) {
cpi_->bits_off_target = cpi_->oxcf.maximum_buffer_size;
}
cpi_->total_actual_bits += cpi_->projected_frame_size;
cpi_->buffer_level = cpi_->bits_off_target;
/* Propagate values to higher temporal layers */
if (cpi_->oxcf.number_of_layers > 1) {
for (unsigned int i = cpi_->current_layer + 1;
i < cpi_->oxcf.number_of_layers; ++i) {
LAYER_CONTEXT *lc = &cpi_->layer_context[i];
int bits_off_for_this_layer = (int)round(
lc->target_bandwidth / lc->framerate - cpi_->projected_frame_size);
lc->bits_off_target += bits_off_for_this_layer;
/* Clip buffer level to maximum buffer size for the layer */
if (lc->bits_off_target > lc->maximum_buffer_size) {
lc->bits_off_target = lc->maximum_buffer_size;
}
lc->total_actual_bits += cpi_->projected_frame_size;
lc->total_target_vs_actual += bits_off_for_this_layer;
lc->buffer_level = lc->bits_off_target;
}
}
cpi_->common.current_video_frame++;
cpi_->frames_since_key++;
if (cpi_->oxcf.number_of_layers > 1) vp8_save_layer_context(cpi_);
vpx_clear_system_state();
}
} // namespace libvpx