libvpx_vp8_decoder.h

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/*

 *  Copyright (c) 2018 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_VP8_LIBVPX_VP8_DECODER_H_

#define MODULES_VIDEO_CODING_CODECS_VP8_LIBVPX_VP8_DECODER_H_

#include <memory>

#include "absl/types/optional.h"

#include "api/environment/environment.h"

#include "api/field_trials_view.h"

#include "api/video/encoded_image.h"

#include "api/video_codecs/video_decoder.h"

#include "common_video/include/video_frame_buffer_pool.h"

#include "modules/video_coding/codecs/vp8/include/vp8.h"

#include "modules/video_coding/include/video_codec_interface.h"

#include "vpx/vp8dx.h"

#include "vpx/vpx_decoder.h"

namespace webrtc {

class LibvpxVp8Decoder : public VideoDecoder {

 public:

  explicit LibvpxVp8Decoder(const Environment& env);

  ~LibvpxVp8Decoder() override;

  bool Configure(const Settings& settings) override;

  int Decode(const EncodedImage& input_image,

             int64_t /*render_time_ms*/) override;

  // TODO(bugs.webrtc.org/15444): Remove once all subclasses have been migrated

  // to expecting calls Decode without a missing_frames param.

  int Decode(const EncodedImage& input_image,

             bool missing_frames,

             int64_t /*render_time_ms*/) override;

  int RegisterDecodeCompleteCallback(DecodedImageCallback* callback) override;

  int Release() override;

  DecoderInfo GetDecoderInfo() const override;

  const char* ImplementationName() const override;

  struct DeblockParams {

    DeblockParams() : max_level(6), degrade_qp(1), min_qp(0) {}

    DeblockParams(int max_level, int degrade_qp, int min_qp)

        : max_level(max_level), degrade_qp(degrade_qp), min_qp(min_qp) {}

    int max_level;   // Deblocking strength: [0, 16].

    int degrade_qp;  // If QP value is below, start lowering `max_level`.

    int min_qp;      // If QP value is below, turn off deblocking.

};

 private:

  class QpSmoother;

  int ReturnFrame(const vpx_image_t* img,

                  uint32_t timeStamp,

                  int qp,

                  const webrtc::ColorSpace* explicit_color_space);

  const bool use_postproc_;

  VideoFrameBufferPool buffer_pool_;

  DecodedImageCallback* decode_complete_callback_;

  bool inited_;

  vpx_codec_ctx_t* decoder_;

  int last_frame_width_;

  int last_frame_height_;

  bool key_frame_required_;

  const absl::optional<DeblockParams> deblock_params_;

  const std::unique_ptr<QpSmoother> qp_smoother_;

};

}  // namespace webrtc

#endif  // MODULES_VIDEO_CODING_CODECS_VP8_LIBVPX_VP8_DECODER_H_