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https://github.com/mollyim/webrtc.git
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735e33fae0
Bug: None Change-Id: I93760b501ff712ca2f7a9dfa3cba6ed5245e4f4b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/208080 Reviewed-by: Philip Eliasson <philipel@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33297}
89 lines
3.1 KiB
C++
89 lines
3.1 KiB
C++
/*
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* Copyright (c) 2021 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_SVC_SCALABILITY_STRUCTURE_SIMULCAST_H_
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#define MODULES_VIDEO_CODING_SVC_SCALABILITY_STRUCTURE_SIMULCAST_H_
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#include <vector>
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#include "api/transport/rtp/dependency_descriptor.h"
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#include "api/video/video_bitrate_allocation.h"
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#include "common_video/generic_frame_descriptor/generic_frame_info.h"
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#include "modules/video_coding/svc/scalable_video_controller.h"
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namespace webrtc {
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// Scalability structure with multiple independent spatial layers each with the
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// same temporal layering.
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class ScalabilityStructureSimulcast : public ScalableVideoController {
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public:
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ScalabilityStructureSimulcast(int num_spatial_layers,
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int num_temporal_layers);
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~ScalabilityStructureSimulcast() override;
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StreamLayersConfig StreamConfig() const override;
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std::vector<LayerFrameConfig> NextFrameConfig(bool restart) override;
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GenericFrameInfo OnEncodeDone(const LayerFrameConfig& config) override;
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void OnRatesUpdated(const VideoBitrateAllocation& bitrates) override;
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private:
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enum FramePattern {
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kNone,
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kDeltaT2A,
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kDeltaT1,
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kDeltaT2B,
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kDeltaT0,
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};
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static constexpr int kMaxNumSpatialLayers = 3;
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static constexpr int kMaxNumTemporalLayers = 3;
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// Index of the buffer to store last frame for layer (`sid`, `tid`)
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int BufferIndex(int sid, int tid) const {
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return tid * num_spatial_layers_ + sid;
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}
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bool DecodeTargetIsActive(int sid, int tid) const {
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return active_decode_targets_[sid * num_temporal_layers_ + tid];
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}
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void SetDecodeTargetIsActive(int sid, int tid, bool value) {
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active_decode_targets_.set(sid * num_temporal_layers_ + tid, value);
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}
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FramePattern NextPattern() const;
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bool TemporalLayerIsActive(int tid) const;
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const int num_spatial_layers_;
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const int num_temporal_layers_;
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FramePattern last_pattern_ = kNone;
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std::bitset<kMaxNumSpatialLayers> can_reference_t0_frame_for_spatial_id_ = 0;
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std::bitset<kMaxNumSpatialLayers> can_reference_t1_frame_for_spatial_id_ = 0;
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std::bitset<32> active_decode_targets_;
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};
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// S1 0--0--0-
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// ...
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// S0 0--0--0-
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class ScalabilityStructureS2T1 : public ScalabilityStructureSimulcast {
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public:
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ScalabilityStructureS2T1() : ScalabilityStructureSimulcast(2, 1) {}
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~ScalabilityStructureS2T1() override = default;
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FrameDependencyStructure DependencyStructure() const override;
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};
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class ScalabilityStructureS3T3 : public ScalabilityStructureSimulcast {
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public:
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ScalabilityStructureS3T3() : ScalabilityStructureSimulcast(3, 3) {}
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~ScalabilityStructureS3T3() override = default;
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FrameDependencyStructure DependencyStructure() const override;
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};
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} // namespace webrtc
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#endif // MODULES_VIDEO_CODING_SVC_SCALABILITY_STRUCTURE_SIMULCAST_H_
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