66 lines
2.4 KiB
C++
66 lines
2.4 KiB
C++
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/*
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* Copyright 2020 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 <string>
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#include <utility>
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#include "call/adaptation/video_stream_adapter.h"
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#include "rtc_base/synchronization/sequence_checker.h"
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#include "video/adaptation/bitrate_constraint.h"
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namespace webrtc {
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BitrateConstraint::BitrateConstraint()
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: encoder_settings_(absl::nullopt),
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encoder_target_bitrate_bps_(absl::nullopt) {
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sequence_checker_.Detach();
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}
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void BitrateConstraint::OnEncoderSettingsUpdated(
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absl::optional<EncoderSettings> encoder_settings) {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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encoder_settings_ = std::move(encoder_settings);
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}
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void BitrateConstraint::OnEncoderTargetBitrateUpdated(
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absl::optional<uint32_t> encoder_target_bitrate_bps) {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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encoder_target_bitrate_bps_ = std::move(encoder_target_bitrate_bps);
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}
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bool BitrateConstraint::IsAdaptationUpAllowed(
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const VideoStreamInputState& input_state,
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const VideoSourceRestrictions& restrictions_before,
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const VideoSourceRestrictions& restrictions_after) const {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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// Make sure bitrate limits are not violated.
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if (DidIncreaseResolution(restrictions_before, restrictions_after)) {
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uint32_t bitrate_bps = encoder_target_bitrate_bps_.value_or(0);
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absl::optional<VideoEncoder::ResolutionBitrateLimits> bitrate_limits =
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encoder_settings_.has_value()
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? encoder_settings_->encoder_info()
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.GetEncoderBitrateLimitsForResolution(
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// Need some sort of expected resulting pixels to be used
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// instead of unrestricted.
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GetHigherResolutionThan(
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input_state.frame_size_pixels().value()))
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: absl::nullopt;
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if (bitrate_limits.has_value() && bitrate_bps != 0) {
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RTC_DCHECK_GE(bitrate_limits->frame_size_pixels,
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input_state.frame_size_pixels().value());
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return bitrate_bps >=
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static_cast<uint32_t>(bitrate_limits->min_start_bitrate_bps);
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}
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}
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return true;
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}
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} // namespace webrtc
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