decoder_database.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_DECODER_DATABASE_H_

#define MODULES_VIDEO_CODING_DECODER_DATABASE_H_

#include <stdint.h>

#include <map>

#include <memory>

#include <optional>

#include "api/sequence_checker.h"

#include "api/video/encoded_frame.h"

#include "api/video_codecs/video_decoder.h"

#include "modules/video_coding/generic_decoder.h"

namespace webrtc {

class VCMDecoderDatabase {

 public:

  VCMDecoderDatabase();

  VCMDecoderDatabase(const VCMDecoderDatabase&) = delete;

  VCMDecoderDatabase& operator=(const VCMDecoderDatabase&) = delete;

  ~VCMDecoderDatabase() = default;

  // Returns a pointer to the previously registered decoder or nullptr if none

  // was registered for the `payload_type`.

  void DeregisterExternalDecoder(uint8_t payload_type);

  void RegisterExternalDecoder(uint8_t payload_type,

                               std::unique_ptr<VideoDecoder> external_decoder);

  bool IsExternalDecoderRegistered(uint8_t payload_type) const;

  void RegisterReceiveCodec(uint8_t payload_type,

                            const VideoDecoder::Settings& settings);

  bool DeregisterReceiveCodec(uint8_t payload_type);

  void DeregisterReceiveCodecs();

  // Returns a decoder specified by frame.PayloadType. The decoded frame

  // callback of the decoder is set to `decoded_frame_callback`. If no such

  // decoder already exists an instance will be created and initialized.

  // nullptr is returned if no decoder with the specified payload type was found

  // and the function failed to create one.

  VCMGenericDecoder* GetDecoder(

      const EncodedFrame& frame,

      VCMDecodedFrameCallback* decoded_frame_callback);

 private:

  void CreateAndInitDecoder(const EncodedFrame& frame)

      RTC_RUN_ON(decoder_sequence_checker_);

  SequenceChecker decoder_sequence_checker_;

  std::optional<uint8_t> current_payload_type_;

  std::optional<VCMGenericDecoder> current_decoder_

      RTC_GUARDED_BY(decoder_sequence_checker_);

  // Initialization paramaters for decoders keyed by payload type.

  std::map<uint8_t, VideoDecoder::Settings> decoder_settings_;

  // Decoders keyed by payload type.

  std::map<uint8_t, std::unique_ptr<VideoDecoder>> decoders_

      RTC_GUARDED_BY(decoder_sequence_checker_);

};

}  // namespace webrtc

#endif  // MODULES_VIDEO_CODING_DECODER_DATABASE_H_