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/*
* Copyright 2020 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 "video/adaptation/balanced_constraint.h"
#include <string>
#include <utility>
#include "api/sequence_checker.h"
namespace webrtc {
BalancedConstraint::BalancedConstraint(
DegradationPreferenceProvider* degradation_preference_provider,
const FieldTrialsView& field_trials)
: encoder_target_bitrate_bps_(absl::nullopt),
balanced_settings_(field_trials),
degradation_preference_provider_(degradation_preference_provider) {
RTC_DCHECK(degradation_preference_provider_);
sequence_checker_.Detach();
}
void BalancedConstraint::OnEncoderTargetBitrateUpdated(
absl::optional<uint32_t> encoder_target_bitrate_bps) {
RTC_DCHECK_RUN_ON(&sequence_checker_);
encoder_target_bitrate_bps_ = std::move(encoder_target_bitrate_bps);
}
bool BalancedConstraint::IsAdaptationUpAllowed(
const VideoStreamInputState& input_state,
const VideoSourceRestrictions& restrictions_before,
const VideoSourceRestrictions& restrictions_after) const {
RTC_DCHECK_RUN_ON(&sequence_checker_);
// Don't adapt if BalancedDegradationSettings applies and determines this will
// exceed bitrate constraints.
if (degradation_preference_provider_->degradation_preference() ==
DegradationPreference::BALANCED) {
int frame_size_pixels = input_state.single_active_stream_pixels().value_or(
input_state.frame_size_pixels().value());
if (!balanced_settings_.CanAdaptUp(
input_state.video_codec_type(), frame_size_pixels,
encoder_target_bitrate_bps_.value_or(0))) {
return false;
}
if (DidIncreaseResolution(restrictions_before, restrictions_after) &&
!balanced_settings_.CanAdaptUpResolution(
input_state.video_codec_type(), frame_size_pixels,
encoder_target_bitrate_bps_.value_or(0))) {
return false;
}
}
return true;
}
} // namespace webrtc