Vehicle-cpp/hkpc/vision/torchvision/csrc/io/decoder/sync_decoder.h

#pragma once

#include <list>
#include "decoder.h"

namespace ffmpeg {

/**
 * Class uses FFMPEG library to decode media streams.
 * Media bytes can be explicitly provided through read-callback
 * or fetched internally by FFMPEG library
 */
class SyncDecoder : public Decoder {
 public:
  // Allocation of memory must be done with a proper alignment.
  class AVByteStorage : public ByteStorage {
   public:
    explicit AVByteStorage(size_t n);
    ~AVByteStorage() override;
    void ensure(size_t n) override;
    uint8_t* writableTail() override;
    void append(size_t n) override;
    void trim(size_t n) override;
    const uint8_t* data() const override;
    size_t length() const override;
    size_t tail() const override;
    void clear() override;

   private:
    size_t offset_{0};
    size_t length_{0};
    size_t capacity_{0};
    uint8_t* buffer_{nullptr};
  };

 public:
  int decode(DecoderOutputMessage* out, uint64_t timeoutMs) override;

 private:
  void push(DecoderOutputMessage&& buffer) override;
  void onInit() override;
  std::unique_ptr<ByteStorage> createByteStorage(size_t n) override;

 private:
  std::list<DecoderOutputMessage> queue_;
  bool eof_{false};
};
} // namespace ffmpeg