h264_encoder_impl.h

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/*

 *  Copyright (c) 2015 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 MODULES_VIDEO_CODING_CODECS_H264_H264_ENCODER_IMPL_H_

#define MODULES_VIDEO_CODING_CODECS_H264_H264_ENCODER_IMPL_H_

// Everything declared in this header is only required when WebRTC is

// build with H264 support, please do not move anything out of the

// #ifdef unless needed and tested.

#ifdef WEBRTC_USE_H264

#if defined(WEBRTC_WIN) && !defined(__clang__)

#error "See: bugs.webrtc.org/9213#c13."

#endif

#include <memory>

#include <vector>

#include "absl/container/inlined_vector.h"

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

#include "api/video/i420_buffer.h"

#include "api/video/video_codec_constants.h"

#include "api/video_codecs/scalability_mode.h"

#include "api/video_codecs/video_encoder.h"

#include "common_video/h264/h264_bitstream_parser.h"

#include "modules/video_coding/codecs/h264/include/h264.h"

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

#include "modules/video_coding/utility/quality_scaler.h"

#include "third_party/openh264/src/codec/api/wels/codec_app_def.h"

class ISVCEncoder;

namespace webrtc {

class H264EncoderImpl : public VideoEncoder {

 public:

  struct LayerConfig {

    int simulcast_idx = 0;

    int width = -1;

    int height = -1;

    bool sending = true;

    bool key_frame_request = false;

    float max_frame_rate = 0;

    uint32_t target_bps = 0;

    uint32_t max_bps = 0;

    bool frame_dropping_on = false;

    int key_frame_interval = 0;

    int num_temporal_layers = 1;

    void SetStreamState(bool send_stream);

};

  H264EncoderImpl(const Environment& env, H264EncoderSettings settings);

  ~H264EncoderImpl() override;

  // `settings.max_payload_size` is ignored.

  // The following members of `codec_settings` are used. The rest are ignored.

  // - codecType (must be kVideoCodecH264)

  // - targetBitrate

  // - maxFramerate

  // - width

  // - height

  int32_t InitEncode(const VideoCodec* codec_settings,

                     const VideoEncoder::Settings& settings) override;

  int32_t Release() override;

  int32_t RegisterEncodeCompleteCallback(

      EncodedImageCallback* callback) override;

  void SetRates(const RateControlParameters& parameters) override;

  // The result of encoding - an EncodedImage and CodecSpecificInfo - are

  // passed to the encode complete callback.

  int32_t Encode(const VideoFrame& frame,

                 const std::vector<VideoFrameType>* frame_types) override;

  EncoderInfo GetEncoderInfo() const override;

  // Exposed for testing.

  H264PacketizationMode PacketizationModeForTesting() const {

    return packetization_mode_;

 private:

  SEncParamExt CreateEncoderParams(size_t i) const;

  webrtc::H264BitstreamParser h264_bitstream_parser_;

  // Reports statistics with histograms.

  void ReportInit();

  void ReportError();

  std::vector<ISVCEncoder*> encoders_;

  std::vector<SSourcePicture> pictures_;

  std::vector<rtc::scoped_refptr<I420Buffer>> downscaled_buffers_;

  std::vector<LayerConfig> configurations_;

  std::vector<EncodedImage> encoded_images_;

  std::vector<std::unique_ptr<ScalableVideoController>> svc_controllers_;

  absl::InlinedVector<std::optional<ScalabilityMode>, kMaxSimulcastStreams>

      scalability_modes_;

  const Environment env_;

  VideoCodec codec_;

  H264PacketizationMode packetization_mode_;

  size_t max_payload_size_;

  int32_t number_of_cores_;

  std::optional<int> encoder_thread_limit_;

  EncodedImageCallback* encoded_image_callback_;

  bool has_reported_init_;

  bool has_reported_error_;

  std::vector<uint8_t> tl0sync_limit_;

};

}  // namespace webrtc

#endif  // WEBRTC_USE_H264

#endif  // MODULES_VIDEO_CODING_CODECS_H264_H264_ENCODER_IMPL_H_