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/*
* Copyright (c) 2019 The WebRTC 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 "rtc_base/experiments/rate_control_settings.h"
#include <inttypes.h>
#include <stdio.h>
#include <string>
#include "api/transport/field_trial_based_config.h"
#include "rtc_base/logging.h"
#include "rtc_base/numerics/safe_conversions.h"
namespace webrtc {
namespace {
const int kDefaultAcceptedQueueMs = 250;
const int kDefaultMinPushbackTargetBitrateBps = 30000;
const char kVp8TrustedRateControllerFieldTrialName[] =
"WebRTC-LibvpxVp8TrustedRateController";
const char kVp9TrustedRateControllerFieldTrialName[] =
"WebRTC-LibvpxVp9TrustedRateController";
const char kUseBaseHeavyVp8Tl3RateAllocationFieldTrialName[] =
"WebRTC-UseBaseHeavyVP8TL3RateAllocation";
const char* kVideoHysteresisFieldTrialname =
"WebRTC-SimulcastUpswitchHysteresisPercent";
const char* kScreenshareHysteresisFieldTrialname =
"WebRTC-SimulcastScreenshareUpswitchHysteresisPercent";
bool IsEnabled(const WebRtcKeyValueConfig* const key_value_config,
absl::string_view key) {
return key_value_config->Lookup(key).find("Enabled") == 0;
}
void ParseHysteresisFactor(const WebRtcKeyValueConfig* const key_value_config,
absl::string_view key,
double* output_value) {
std::string group_name = key_value_config->Lookup(key);
int percent = 0;
if (!group_name.empty() && sscanf(group_name.c_str(), "%d", &percent) == 1 &&
percent >= 0) {
*output_value = 1.0 + (percent / 100.0);
}
}
} // namespace
constexpr char CongestionWindowConfig::kKey[];
std::unique_ptr<StructParametersParser> CongestionWindowConfig::Parser() {
return StructParametersParser::Create("QueueSize", &queue_size_ms, //
"MinBitrate", &min_bitrate_bps);
}
// static
CongestionWindowConfig CongestionWindowConfig::Parse(absl::string_view config) {
CongestionWindowConfig res;
res.Parser()->Parse(config);
return res;
}
constexpr char VideoRateControlConfig::kKey[];
std::unique_ptr<StructParametersParser> VideoRateControlConfig::Parser() {
// The empty comments ensures that each pair is on a separate line.
return StructParametersParser::Create(
"pacing_factor", &pacing_factor, //
"alr_probing", &alr_probing, //
"vp8_qp_max", &vp8_qp_max, //
"vp8_min_pixels", &vp8_min_pixels, //
"trust_vp8", &trust_vp8, //
"trust_vp9", &trust_vp9, //
"video_hysteresis", &video_hysteresis, //
"screenshare_hysteresis", &screenshare_hysteresis, //
"probe_max_allocation", &probe_max_allocation, //
"bitrate_adjuster", &bitrate_adjuster, //
"adjuster_use_headroom", &adjuster_use_headroom, //
"vp8_s0_boost", &vp8_s0_boost, //
"vp8_base_heavy_tl3_alloc", &vp8_base_heavy_tl3_alloc, //
"vp8_dynamic_rate", &vp8_dynamic_rate, //
"vp9_dynamic_rate", &vp9_dynamic_rate);
}
RateControlSettings::RateControlSettings(
const WebRtcKeyValueConfig* const key_value_config)
: congestion_window_config_(CongestionWindowConfig::Parse(
key_value_config->Lookup(CongestionWindowConfig::kKey))) {
video_config_.trust_vp8 =
IsEnabled(key_value_config, kVp8TrustedRateControllerFieldTrialName);
video_config_.trust_vp9 =
IsEnabled(key_value_config, kVp9TrustedRateControllerFieldTrialName);
video_config_.vp8_base_heavy_tl3_alloc = IsEnabled(
key_value_config, kUseBaseHeavyVp8Tl3RateAllocationFieldTrialName);
ParseHysteresisFactor(key_value_config, kVideoHysteresisFieldTrialname,
&video_config_.video_hysteresis);
ParseHysteresisFactor(key_value_config, kScreenshareHysteresisFieldTrialname,
&video_config_.screenshare_hysteresis);
video_config_.Parser()->Parse(
key_value_config->Lookup(VideoRateControlConfig::kKey));
}
RateControlSettings::~RateControlSettings() = default;
RateControlSettings::RateControlSettings(RateControlSettings&&) = default;
RateControlSettings RateControlSettings::ParseFromFieldTrials() {
FieldTrialBasedConfig field_trial_config;
return RateControlSettings(&field_trial_config);
}
RateControlSettings RateControlSettings::ParseFromKeyValueConfig(
const WebRtcKeyValueConfig* const key_value_config) {
FieldTrialBasedConfig field_trial_config;
return RateControlSettings(key_value_config ? key_value_config
: &field_trial_config);
}
bool RateControlSettings::UseCongestionWindow() const {
return static_cast<bool>(congestion_window_config_.queue_size_ms);
}
int64_t RateControlSettings::GetCongestionWindowAdditionalTimeMs() const {
return congestion_window_config_.queue_size_ms.value_or(
kDefaultAcceptedQueueMs);
}
bool RateControlSettings::UseCongestionWindowPushback() const {
return congestion_window_config_.queue_size_ms &&
congestion_window_config_.min_bitrate_bps;
}
uint32_t RateControlSettings::CongestionWindowMinPushbackTargetBitrateBps()
const {
return congestion_window_config_.min_bitrate_bps.value_or(
kDefaultMinPushbackTargetBitrateBps);
}
absl::optional<double> RateControlSettings::GetPacingFactor() const {
return video_config_.pacing_factor;
}
bool RateControlSettings::UseAlrProbing() const {
return video_config_.alr_probing;
}
absl::optional<int> RateControlSettings::LibvpxVp8QpMax() const {
if (video_config_.vp8_qp_max &&
(*video_config_.vp8_qp_max < 0 || *video_config_.vp8_qp_max > 63)) {
RTC_LOG(LS_WARNING) << "Unsupported vp8_qp_max_ value, ignored.";
return absl::nullopt;
}
return video_config_.vp8_qp_max;
}
absl::optional<int> RateControlSettings::LibvpxVp8MinPixels() const {
if (video_config_.vp8_min_pixels && *video_config_.vp8_min_pixels < 1) {
return absl::nullopt;
}
return video_config_.vp8_min_pixels;
}
bool RateControlSettings::LibvpxVp8TrustedRateController() const {
return video_config_.trust_vp8;
}
bool RateControlSettings::Vp8BoostBaseLayerQuality() const {
return video_config_.vp8_s0_boost;
}
bool RateControlSettings::Vp8DynamicRateSettings() const {
return video_config_.vp8_dynamic_rate;
}
bool RateControlSettings::LibvpxVp9TrustedRateController() const {
return video_config_.trust_vp9;
}
bool RateControlSettings::Vp9DynamicRateSettings() const {
return video_config_.vp9_dynamic_rate;
}
double RateControlSettings::GetSimulcastHysteresisFactor(
VideoCodecMode mode) const {
if (mode == VideoCodecMode::kScreensharing) {
return video_config_.screenshare_hysteresis;
}
return video_config_.video_hysteresis;
}
double RateControlSettings::GetSimulcastHysteresisFactor(
VideoEncoderConfig::ContentType content_type) const {
if (content_type == VideoEncoderConfig::ContentType::kScreen) {
return video_config_.screenshare_hysteresis;
}
return video_config_.video_hysteresis;
}
bool RateControlSettings::Vp8BaseHeavyTl3RateAllocation() const {
return video_config_.vp8_base_heavy_tl3_alloc;
}
bool RateControlSettings::TriggerProbeOnMaxAllocatedBitrateChange() const {
return video_config_.probe_max_allocation;
}
bool RateControlSettings::UseEncoderBitrateAdjuster() const {
return video_config_.bitrate_adjuster;
}
bool RateControlSettings::BitrateAdjusterCanUseNetworkHeadroom() const {
return video_config_.adjuster_use_headroom;
}
} // namespace webrtc