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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/quality_rampup_experiment.h"
#include <algorithm>
#include "api/transport/field_trial_based_config.h"
#include "rtc_base/logging.h"
namespace webrtc {
QualityRampupExperiment::QualityRampupExperiment(
const FieldTrialsView* const key_value_config)
: min_pixels_("min_pixels"),
min_duration_ms_("min_duration_ms"),
max_bitrate_factor_("max_bitrate_factor") {
ParseFieldTrial(
{&min_pixels_, &min_duration_ms_, &max_bitrate_factor_},
key_value_config->Lookup("WebRTC-Video-QualityRampupSettings"));
}
QualityRampupExperiment QualityRampupExperiment::ParseSettings() {
FieldTrialBasedConfig field_trial_config;
return QualityRampupExperiment(&field_trial_config);
}
absl::optional<int> QualityRampupExperiment::MinPixels() const {
return min_pixels_.GetOptional();
}
absl::optional<int> QualityRampupExperiment::MinDurationMs() const {
return min_duration_ms_.GetOptional();
}
absl::optional<double> QualityRampupExperiment::MaxBitrateFactor() const {
return max_bitrate_factor_.GetOptional();
}
void QualityRampupExperiment::SetMaxBitrate(int pixels,
uint32_t max_bitrate_kbps) {
if (!min_pixels_ || pixels < min_pixels_.Value() || max_bitrate_kbps == 0) {
return;
}
max_bitrate_kbps_ = std::max(max_bitrate_kbps_.value_or(0), max_bitrate_kbps);
}
bool QualityRampupExperiment::BwHigh(int64_t now_ms,
uint32_t available_bw_kbps) {
if (!min_pixels_ || !min_duration_ms_ || !max_bitrate_kbps_) {
return false;
}
if (available_bw_kbps <
max_bitrate_kbps_.value() * MaxBitrateFactor().value_or(1)) {
start_ms_.reset();
return false;
}
if (!start_ms_)
start_ms_ = now_ms;
return (now_ms - *start_ms_) >= min_duration_ms_.Value();
}
void QualityRampupExperiment::Reset() {
start_ms_.reset();
max_bitrate_kbps_.reset();
}
bool QualityRampupExperiment::Enabled() const {
return min_pixels_ && min_duration_ms_;
}
} // namespace webrtc
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