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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/bitrate_constraint.h"
#include <utility>
#include <vector>
#include "api/sequence_checker.h"
#include "call/adaptation/video_stream_adapter.h"
#include "video/adaptation/video_stream_encoder_resource_manager.h"
namespace webrtc {
BitrateConstraint::BitrateConstraint()
: encoder_settings_(absl::nullopt),
encoder_target_bitrate_bps_(absl::nullopt) {
sequence_checker_.Detach();
}
void BitrateConstraint::OnEncoderSettingsUpdated(
absl::optional<EncoderSettings> encoder_settings) {
RTC_DCHECK_RUN_ON(&sequence_checker_);
encoder_settings_ = std::move(encoder_settings);
}
void BitrateConstraint::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);
}
// Checks if resolution is allowed to adapt up based on the current bitrate and
// ResolutionBitrateLimits.min_start_bitrate_bps for the next higher resolution.
// Bitrate limits usage is restricted to a single active stream/layer (e.g. when
// quality scaling is enabled).
bool BitrateConstraint::IsAdaptationUpAllowed(
const VideoStreamInputState& input_state,
const VideoSourceRestrictions& restrictions_before,
const VideoSourceRestrictions& restrictions_after) const {
RTC_DCHECK_RUN_ON(&sequence_checker_);
// Make sure bitrate limits are not violated.
if (DidIncreaseResolution(restrictions_before, restrictions_after)) {
if (!encoder_settings_.has_value()) {
return true;
}
uint32_t bitrate_bps = encoder_target_bitrate_bps_.value_or(0);
if (bitrate_bps == 0) {
return true;
}
if (VideoStreamEncoderResourceManager::IsSimulcastOrMultipleSpatialLayers(
encoder_settings_->encoder_config(),
encoder_settings_->video_codec())) {
// Resolution bitrate limits usage is restricted to singlecast.
return true;
}
absl::optional<int> current_frame_size_px =
input_state.single_active_stream_pixels();
if (!current_frame_size_px.has_value()) {
return true;
}
absl::optional<VideoEncoder::ResolutionBitrateLimits> bitrate_limits =
encoder_settings_->encoder_info().GetEncoderBitrateLimitsForResolution(
// Need some sort of expected resulting pixels to be used
// instead of unrestricted.
GetHigherResolutionThan(*current_frame_size_px));
if (bitrate_limits.has_value()) {
RTC_DCHECK_GE(bitrate_limits->frame_size_pixels, *current_frame_size_px);
return bitrate_bps >=
static_cast<uint32_t>(bitrate_limits->min_start_bitrate_bps);
}
}
return true;
}
} // namespace webrtc