78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
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/*
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* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "rtc_base/experiments/quality_rampup_experiment.h"
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#include <algorithm>
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#include "api/transport/field_trial_based_config.h"
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#include "rtc_base/logging.h"
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namespace webrtc {
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QualityRampupExperiment::QualityRampupExperiment(
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const WebRtcKeyValueConfig* const key_value_config)
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: min_pixels_("min_pixels"),
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min_duration_ms_("min_duration_ms"),
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max_bitrate_factor_("max_bitrate_factor") {
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ParseFieldTrial(
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{&min_pixels_, &min_duration_ms_, &max_bitrate_factor_},
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key_value_config->Lookup("WebRTC-Video-QualityRampupSettings"));
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}
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QualityRampupExperiment QualityRampupExperiment::ParseSettings() {
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FieldTrialBasedConfig field_trial_config;
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return QualityRampupExperiment(&field_trial_config);
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}
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absl::optional<int> QualityRampupExperiment::MinPixels() const {
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return min_pixels_.GetOptional();
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}
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absl::optional<int> QualityRampupExperiment::MinDurationMs() const {
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return min_duration_ms_.GetOptional();
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}
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absl::optional<double> QualityRampupExperiment::MaxBitrateFactor() const {
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return max_bitrate_factor_.GetOptional();
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}
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void QualityRampupExperiment::SetMaxBitrate(int pixels,
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uint32_t max_bitrate_kbps) {
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if (!min_pixels_ || pixels < min_pixels_.Value() || max_bitrate_kbps == 0) {
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return;
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}
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max_bitrate_kbps_ = std::max(max_bitrate_kbps_.value_or(0), max_bitrate_kbps);
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}
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bool QualityRampupExperiment::BwHigh(int64_t now_ms,
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uint32_t available_bw_kbps) {
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if (!min_pixels_ || !min_duration_ms_ || !max_bitrate_kbps_) {
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return false;
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}
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if (available_bw_kbps <
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max_bitrate_kbps_.value() * MaxBitrateFactor().value_or(1)) {
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start_ms_.reset();
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return false;
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}
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if (!start_ms_)
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start_ms_ = now_ms;
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return (now_ms - *start_ms_) >= min_duration_ms_.Value();
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}
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bool QualityRampupExperiment::Enabled() const {
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return min_pixels_ || min_duration_ms_ || max_bitrate_kbps_;
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}
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} // namespace webrtc
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