ffmpeg.h

#pragma once
#include <array>
#include <stdexcept>
extern "C" {
#include <libavcodec/version.h>
#include <libavutil/avutil.h>
#include <libavutil/frame.h>
}
#include "string_utils.h"

const static double AV_TIME_TO_SEC = av_q2d(AV_TIME_BASE_Q);
const static double SEC_TO_AV_TIME = AV_TIME_BASE;
const static double MILLISEC_TO_AV_TIME = SEC_TO_AV_TIME / 1000.0;
const static AVRational AV_R_MICROSECONDS = {1, AV_TIME_BASE};

namespace ffmpeg {
class Error : public std::runtime_error {
 public:
  explicit Error(const std::string& message);
  explicit Error(int status);
  Error(const std::string& file_name, int status);
};

std::string error_string(int error_code);

inline int check(const int status) {
  if (status < 0) {
    throw ffmpeg::Error{status};
  }
  return status;
}

inline int check(const std::string& file_name, const int status) {
  if (status < 0) {
    throw ffmpeg::Error{file_name, status};
  }
  return status;
}

inline float pts_in_secs(const AVFrame* frame) {
  return frame->pts * AV_TIME_TO_SEC;
}

inline int64_t& frame_duration(AVFrame* frame) {
#if (LIBAVUTIL_VERSION_INT < AV_VERSION_INT(59, 8, 100))
  return frame->pkt_duration;
#else
  return frame->duration;
#endif
}

inline int64_t frame_duration(const AVFrame* frame) {
  return frame_duration(const_cast<AVFrame*>(frame));
}

inline float frame_duration_in_secs(const AVFrame* frame) {
  return frame_duration(frame) * AV_TIME_TO_SEC;
}

inline void check_dict_is_empty(AVDictionary* dict, const std::string& context) {
  AVDictionaryEntry* unsupported_option = av_dict_get(dict, "", nullptr, AV_DICT_IGNORE_SUFFIX);

  if (unsupported_option != nullptr) {
    throw ffmpeg::Error{string_sprintf("%s does not support the option %s", context.c_str(), unsupported_option->key)};
  }
}
}  // namespace ffmpeg