141 lines
5.3 KiB
C++
141 lines
5.3 KiB
C++
/*
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* Copyright (c) 2014 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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*/
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#ifndef MEDIA_ENGINE_SIMULCAST_ENCODER_ADAPTER_H_
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#define MEDIA_ENGINE_SIMULCAST_ENCODER_ADAPTER_H_
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#include <memory>
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#include <stack>
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#include <string>
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#include <utility>
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#include <vector>
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#include "absl/types/optional.h"
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#include "api/fec_controller_override.h"
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#include "api/video_codecs/sdp_video_format.h"
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#include "api/video_codecs/video_encoder.h"
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#include "modules/video_coding/include/video_codec_interface.h"
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#include "modules/video_coding/utility/framerate_controller.h"
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#include "rtc_base/atomic_ops.h"
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#include "rtc_base/synchronization/sequence_checker.h"
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#include "rtc_base/system/rtc_export.h"
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namespace webrtc {
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class SimulcastRateAllocator;
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class VideoEncoderFactory;
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// SimulcastEncoderAdapter implements simulcast support by creating multiple
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// webrtc::VideoEncoder instances with the given VideoEncoderFactory.
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// The object is created and destroyed on the worker thread, but all public
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// interfaces should be called from the encoder task queue.
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class RTC_EXPORT SimulcastEncoderAdapter : public VideoEncoder {
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public:
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// TODO(bugs.webrtc.org/11000): Remove when downstream usage is gone.
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SimulcastEncoderAdapter(VideoEncoderFactory* primarty_factory,
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const SdpVideoFormat& format);
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// |primary_factory| produces the first-choice encoders to use.
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// |fallback_factory|, if non-null, is used to create fallback encoder that
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// will be used if InitEncode() fails for the primary encoder.
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SimulcastEncoderAdapter(VideoEncoderFactory* primary_factory,
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VideoEncoderFactory* fallback_factory,
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const SdpVideoFormat& format);
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~SimulcastEncoderAdapter() override;
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// Implements VideoEncoder.
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void SetFecControllerOverride(
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FecControllerOverride* fec_controller_override) override;
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int Release() override;
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int InitEncode(const VideoCodec* codec_settings,
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const VideoEncoder::Settings& settings) override;
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int Encode(const VideoFrame& input_image,
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const std::vector<VideoFrameType>* frame_types) override;
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int RegisterEncodeCompleteCallback(EncodedImageCallback* callback) override;
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void SetRates(const RateControlParameters& parameters) override;
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void OnPacketLossRateUpdate(float packet_loss_rate) override;
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void OnRttUpdate(int64_t rtt_ms) override;
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void OnLossNotification(const LossNotification& loss_notification) override;
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// Eventual handler for the contained encoders' EncodedImageCallbacks, but
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// called from an internal helper that also knows the correct stream
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// index.
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EncodedImageCallback::Result OnEncodedImage(
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size_t stream_idx,
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const EncodedImage& encoded_image,
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const CodecSpecificInfo* codec_specific_info);
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EncoderInfo GetEncoderInfo() const override;
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private:
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struct StreamInfo {
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StreamInfo(std::unique_ptr<VideoEncoder> encoder,
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std::unique_ptr<EncodedImageCallback> callback,
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std::unique_ptr<FramerateController> framerate_controller,
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uint16_t width,
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uint16_t height,
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bool send_stream)
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: encoder(std::move(encoder)),
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callback(std::move(callback)),
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framerate_controller(std::move(framerate_controller)),
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width(width),
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height(height),
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key_frame_request(false),
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send_stream(send_stream) {}
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std::unique_ptr<VideoEncoder> encoder;
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std::unique_ptr<EncodedImageCallback> callback;
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std::unique_ptr<FramerateController> framerate_controller;
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uint16_t width;
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uint16_t height;
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bool key_frame_request;
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bool send_stream;
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};
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enum class StreamResolution {
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OTHER,
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HIGHEST,
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LOWEST,
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};
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// Populate the codec settings for each simulcast stream.
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void PopulateStreamCodec(const webrtc::VideoCodec& inst,
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int stream_index,
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uint32_t start_bitrate_kbps,
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StreamResolution stream_resolution,
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webrtc::VideoCodec* stream_codec);
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bool Initialized() const;
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void DestroyStoredEncoders();
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volatile int inited_; // Accessed atomically.
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VideoEncoderFactory* const primary_encoder_factory_;
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VideoEncoderFactory* const fallback_encoder_factory_;
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const SdpVideoFormat video_format_;
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VideoCodec codec_;
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std::vector<StreamInfo> streaminfos_;
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EncodedImageCallback* encoded_complete_callback_;
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// Used for checking the single-threaded access of the encoder interface.
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SequenceChecker encoder_queue_;
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// Store encoders in between calls to Release and InitEncode, so they don't
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// have to be recreated. Remaining encoders are destroyed by the destructor.
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std::stack<std::unique_ptr<VideoEncoder>> stored_encoders_;
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const absl::optional<unsigned int> experimental_boosted_screenshare_qp_;
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const bool boost_base_layer_quality_;
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const bool prefer_temporal_support_on_base_layer_;
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};
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} // namespace webrtc
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#endif // MEDIA_ENGINE_SIMULCAST_ENCODER_ADAPTER_H_
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