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3064f31ce4
If the bandwidth is just on the edge of being able to enable a new stream, the keyframe generated when it is enabled might be large enough to trigger an overuse and force the stream off again. To avoid toggling, this CL adds hysteresis so that the available bandwidth needs to be above X% to start bitrate in order to enable the stream. It will be shut down once available bitrate falls below the original enabling bitrate. For screen content, X defaults to 35. For realtime content, X defaults to 0. Both can be individually modified via field trials. Bug: webrtc:9734 Change-Id: I941332d7be7f2a801d13d9202b2076d330e7df32 Reviewed-on: https://webrtc-review.googlesource.com/100308 Reviewed-by: Rasmus Brandt <brandtr@webrtc.org> Commit-Queue: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/master@{#24745}
65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
/*
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* Copyright (c) 2016 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 MODULES_VIDEO_CODING_UTILITY_SIMULCAST_RATE_ALLOCATOR_H_
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#define MODULES_VIDEO_CODING_UTILITY_SIMULCAST_RATE_ALLOCATOR_H_
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#include <stdint.h>
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#include <map>
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#include <memory>
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#include <vector>
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#include "api/video/video_bitrate_allocator.h"
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#include "api/video_codecs/video_encoder.h"
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#include "common_types.h" // NOLINT(build/include)
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#include "rtc_base/constructormagic.h"
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namespace webrtc {
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class SimulcastRateAllocator : public VideoBitrateAllocator {
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public:
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explicit SimulcastRateAllocator(const VideoCodec& codec);
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~SimulcastRateAllocator() override;
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VideoBitrateAllocation GetAllocation(uint32_t total_bitrate_bps,
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uint32_t framerate) override;
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const VideoCodec& GetCodec() const;
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static float GetTemporalRateAllocation(int num_layers, int temporal_id);
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private:
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void DistributeAllocationToSimulcastLayers(
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uint32_t total_bitrate_bps,
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VideoBitrateAllocation* allocated_bitrates_bps);
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void DistributeAllocationToTemporalLayers(
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uint32_t framerate,
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VideoBitrateAllocation* allocated_bitrates_bps) const;
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std::vector<uint32_t> DefaultTemporalLayerAllocation(int bitrate_kbps,
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int max_bitrate_kbps,
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int framerate,
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int simulcast_id) const;
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std::vector<uint32_t> ScreenshareTemporalLayerAllocation(
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int bitrate_kbps,
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int max_bitrate_kbps,
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int framerate,
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int simulcast_id) const;
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int NumTemporalStreams(size_t simulcast_id) const;
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const VideoCodec codec_;
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const double hysteresis_factor_;
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std::vector<bool> stream_enabled_;
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RTC_DISALLOW_COPY_AND_ASSIGN(SimulcastRateAllocator);
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};
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} // namespace webrtc
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#endif // MODULES_VIDEO_CODING_UTILITY_SIMULCAST_RATE_ALLOCATOR_H_
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