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With current congestion window pushback, when congestion window is filling up, it will reduce bitrate directly and encoder may reduce encode quality, resolution, or framerate to adapt to the allocated bitrate, the behavior is depending on the degradation preference. This change enable congestion window to only drop frames to reduce bitrate (when needed) instead of reduce general bitrate allocation. Bug: webrtc:11334 Change-Id: I9cf5c20a0858c4d07d006942abe72aa5e1f7cb38 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168059 Commit-Queue: Ying Wang <yinwa@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Åsa Persson <asapersson@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30483}
107 lines
3.8 KiB
C++
107 lines
3.8 KiB
C++
/*
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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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#ifndef RTC_BASE_EXPERIMENTS_RATE_CONTROL_SETTINGS_H_
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#define RTC_BASE_EXPERIMENTS_RATE_CONTROL_SETTINGS_H_
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#include "absl/types/optional.h"
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#include "api/transport/webrtc_key_value_config.h"
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#include "api/units/data_size.h"
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#include "api/video_codecs/video_codec.h"
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#include "api/video_codecs/video_encoder_config.h"
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#include "rtc_base/experiments/struct_parameters_parser.h"
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namespace webrtc {
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struct CongestionWindowConfig {
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static constexpr char kKey[] = "WebRTC-CongestionWindow";
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absl::optional<int> queue_size_ms;
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absl::optional<int> min_bitrate_bps;
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absl::optional<DataSize> initial_data_window;
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bool drop_frame_only = false;
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std::unique_ptr<StructParametersParser> Parser();
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static CongestionWindowConfig Parse(absl::string_view config);
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};
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struct VideoRateControlConfig {
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static constexpr char kKey[] = "WebRTC-VideoRateControl";
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absl::optional<double> pacing_factor;
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bool alr_probing = false;
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absl::optional<int> vp8_qp_max;
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absl::optional<int> vp8_min_pixels;
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bool trust_vp8 = false;
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bool trust_vp9 = false;
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double video_hysteresis = 1.0;
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// Default to 35% hysteresis for simulcast screenshare.
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double screenshare_hysteresis = 1.35;
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bool probe_max_allocation = true;
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bool bitrate_adjuster = false;
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bool adjuster_use_headroom = false;
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bool vp8_s0_boost = true;
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bool vp8_base_heavy_tl3_alloc = false;
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bool vp8_dynamic_rate = false;
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bool vp9_dynamic_rate = false;
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std::unique_ptr<StructParametersParser> Parser();
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};
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class RateControlSettings final {
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public:
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~RateControlSettings();
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RateControlSettings(RateControlSettings&&);
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static RateControlSettings ParseFromFieldTrials();
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static RateControlSettings ParseFromKeyValueConfig(
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const WebRtcKeyValueConfig* const key_value_config);
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// When CongestionWindowPushback is enabled, the pacer is oblivious to
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// the congestion window. The relation between outstanding data and
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// the congestion window affects encoder allocations directly.
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bool UseCongestionWindow() const;
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int64_t GetCongestionWindowAdditionalTimeMs() const;
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bool UseCongestionWindowPushback() const;
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bool UseCongestionWindowDropFrameOnly() const;
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uint32_t CongestionWindowMinPushbackTargetBitrateBps() const;
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absl::optional<DataSize> CongestionWindowInitialDataWindow() const;
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absl::optional<double> GetPacingFactor() const;
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bool UseAlrProbing() const;
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absl::optional<int> LibvpxVp8QpMax() const;
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absl::optional<int> LibvpxVp8MinPixels() const;
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bool LibvpxVp8TrustedRateController() const;
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bool Vp8BoostBaseLayerQuality() const;
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bool Vp8DynamicRateSettings() const;
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bool LibvpxVp9TrustedRateController() const;
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bool Vp9DynamicRateSettings() const;
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// TODO(bugs.webrtc.org/10272): Remove one of these when we have merged
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// VideoCodecMode and VideoEncoderConfig::ContentType.
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double GetSimulcastHysteresisFactor(VideoCodecMode mode) const;
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double GetSimulcastHysteresisFactor(
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VideoEncoderConfig::ContentType content_type) const;
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bool Vp8BaseHeavyTl3RateAllocation() const;
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bool TriggerProbeOnMaxAllocatedBitrateChange() const;
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bool UseEncoderBitrateAdjuster() const;
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bool BitrateAdjusterCanUseNetworkHeadroom() const;
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private:
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explicit RateControlSettings(
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const WebRtcKeyValueConfig* const key_value_config);
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const CongestionWindowConfig congestion_window_config_;
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VideoRateControlConfig video_config_;
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};
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} // namespace webrtc
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#endif // RTC_BASE_EXPERIMENTS_RATE_CONTROL_SETTINGS_H_
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