simple_encoder_wrapper.h

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/*

 *  Copyright (c) 2024 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.

*/

#ifndef API_VIDEO_CODECS_SIMPLE_ENCODER_WRAPPER_H_

#define API_VIDEO_CODECS_SIMPLE_ENCODER_WRAPPER_H_

#include <cstdint>

#include <functional>

#include <memory>

#include <optional>

#include <string>

#include <vector>

#include "absl/strings/string_view.h"

#include "api/scoped_refptr.h"

#include "api/transport/rtp/dependency_descriptor.h"

#include "api/units/timestamp.h"

#include "api/video/video_frame_buffer.h"

#include "api/video_codecs/video_encoder_factory_interface.h"

#include "api/video_codecs/video_encoder_interface.h"

#include "common_video/generic_frame_descriptor/generic_frame_info.h"

#include "modules/video_coding/svc/scalable_video_controller.h"

namespace webrtc {

class SimpleEncoderWrapper {

 public:

  struct EncodeResult {

    bool oh_no = false;

    std::vector<uint8_t> bitstream_data;

    FrameType frame_type;

    GenericFrameInfo generic_frame_info;

    std::optional<FrameDependencyStructure> dependency_structure;

};

  using EncodeResultCallback = std::function<void(const EncodeResult& result)>;

  static std::vector<std::string> SupportedWebrtcSvcModes(

      const VideoEncoderFactoryInterface::Capabilities::PredictionConstraints&

          prediction_constraints);

  static std::unique_ptr<SimpleEncoderWrapper> Create(

      std::unique_ptr<VideoEncoderInterface> encoder,

      absl::string_view scalability_mode);

  // Should be private, use the Create function instead.

  SimpleEncoderWrapper(std::unique_ptr<VideoEncoderInterface> encoder,

                       std::unique_ptr<ScalableVideoController> svc_controller);

  // We should really only support CBR, but then we have to think about layer

  // allocations... eh... For this PoC just use CQP.

  void SetEncodeQp(int qp);

  void SetEncodeFps(int fps);

  void Encode(rtc::scoped_refptr<webrtc::VideoFrameBuffer> frame_buffer,

              bool force_keyframe,

              EncodeResultCallback callback);

 private:

  std::unique_ptr<VideoEncoderInterface> encoder_;

  std::unique_ptr<ScalableVideoController> svc_controller_;

  ScalableVideoController::StreamLayersConfig layer_configs_;

  int target_qp_ = 0;

  int fps_ = 0;

  Timestamp presentation_timestamp_ = Timestamp::Zero();

};

}  // namespace webrtc

#endif  // API_VIDEO_CODECS_SIMPLE_ENCODER_WRAPPER_H_