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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 "absl/strings/match.h"
#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 = 350;
const int kDefaultMinPushbackTargetBitrateBps = 30000;
const char kCongestionWindowDefaultFieldTrialString[] =
"QueueSize:350,MinBitrate:30000,DropFrame:true";
const char kUseBaseHeavyVp8Tl3RateAllocationFieldTrialName[] =
"WebRTC-UseBaseHeavyVP8TL3RateAllocation";
bool IsEnabled(const FieldTrialsView* const key_value_config,
absl::string_view key) {
return absl::StartsWith(key_value_config->Lookup(key), "Enabled");
}
} // namespace
constexpr char CongestionWindowConfig::kKey[];
std::unique_ptr<StructParametersParser> CongestionWindowConfig::Parser() {
return StructParametersParser::Create("QueueSize", &queue_size_ms, //
"MinBitrate", &min_bitrate_bps,
"InitWin", &initial_data_window,
"DropFrame", &drop_frame_only);
}
// 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, //
"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);
}
RateControlSettings::RateControlSettings(
const FieldTrialsView* const key_value_config) {
std::string congestion_window_config =
key_value_config->Lookup(CongestionWindowConfig::kKey).empty()
? kCongestionWindowDefaultFieldTrialString
: key_value_config->Lookup(CongestionWindowConfig::kKey);
congestion_window_config_ =
CongestionWindowConfig::Parse(congestion_window_config);
video_config_.vp8_base_heavy_tl3_alloc = IsEnabled(
key_value_config, kUseBaseHeavyVp8Tl3RateAllocationFieldTrialName);
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 FieldTrialsView* 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;
}
bool RateControlSettings::UseCongestionWindowDropFrameOnly() const {
return congestion_window_config_.drop_frame_only;
}
uint32_t RateControlSettings::CongestionWindowMinPushbackTargetBitrateBps()
const {
return congestion_window_config_.min_bitrate_bps.value_or(
kDefaultMinPushbackTargetBitrateBps);
}
absl::optional<DataSize>
RateControlSettings::CongestionWindowInitialDataWindow() const {
return congestion_window_config_.initial_data_window;
}
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::LibvpxVp9TrustedRateController() const {
return video_config_.trust_vp9;
}
bool RateControlSettings::Vp8BaseHeavyTl3RateAllocation() const {
return video_config_.vp8_base_heavy_tl3_alloc;
}
bool RateControlSettings::UseEncoderBitrateAdjuster() const {
return video_config_.bitrate_adjuster;
}
bool RateControlSettings::BitrateAdjusterCanUseNetworkHeadroom() const {
return video_config_.adjuster_use_headroom;
}
} // namespace webrtc
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