text: /*
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  /**
   * @file
   * error code definitions
   */
  
  #ifndef AVUTIL_ERROR_H
  #define AVUTIL_ERROR_H
  
  #include <errno.h>
  #include <stddef.h>
  
  /**
   * @addtogroup lavu_error
   *
   * @{
   */
  
  
  /* error handling */
  #if EDOM > 0
  #define AVERROR(e) (-(e))   ///< Returns a negative error code from a POSIX error code, to return from library functions.
  #define AVUNERROR(e) (-(e)) ///< Returns a POSIX error code from a library function error return value.
  #else
  /* Some platforms have E* and errno already negated. */
  #define AVERROR(e) (e)
  #define AVUNERROR(e) (e)
  #endif
  
  #define FFERRTAG(a, b, c, d) (-(int)MKTAG(a, b, c, d))
  
  #define AVERROR_BSF_NOT_FOUND      FFERRTAG(0xF8,'B','S','F') ///< Bitstream filter not found
  #define AVERROR_BUG                FFERRTAG( 'B','U','G','!') ///< Internal bug, also see AVERROR_BUG2
  #define AVERROR_BUFFER_TOO_SMALL   FFERRTAG( 'B','U','F','S') ///< Buffer too small
  #define AVERROR_DECODER_NOT_FOUND  FFERRTAG(0xF8,'D','E','C') ///< Decoder not found
  #define AVERROR_DEMUXER_NOT_FOUND  FFERRTAG(0xF8,'D','E','M') ///< Demuxer not found
  #define AVERROR_ENCODER_NOT_FOUND  FFERRTAG(0xF8,'E','N','C') ///< Encoder not found
  #define AVERROR_EOF                FFERRTAG( 'E','O','F',' ') ///< End of file
  #define AVERROR_EXIT               FFERRTAG( 'E','X','I','T') ///< Immediate exit was requested; the called function should not be restarted
  #define AVERROR_EXTERNAL           FFERRTAG( 'E','X','T',' ') ///< Generic error in an external library
  #define AVERROR_FILTER_NOT_FOUND   FFERRTAG(0xF8,'F','I','L') ///< Filter not found
  #define AVERROR_INVALIDDATA        FFERRTAG( 'I','N','D','A') ///< Invalid data found when processing input
  #define AVERROR_MUXER_NOT_FOUND    FFERRTAG(0xF8,'M','U','X') ///< Muxer not found
  #define AVERROR_OPTION_NOT_FOUND   FFERRTAG(0xF8,'O','P','T') ///< Option not found
  #define AVERROR_PATCHWELCOME       FFERRTAG( 'P','A','W','E') ///< Not yet implemented in FFmpeg, patches welcome
  #define AVERROR_PROTOCOL_NOT_FOUND FFERRTAG(0xF8,'P','R','O') ///< Protocol not found
  
  #define AVERROR_STREAM_NOT_FOUND   FFERRTAG(0xF8,'S','T','R') ///< Stream not found
  /**
   * This is semantically identical to AVERROR_BUG
   * it has been introduced in Libav after our AVERROR_BUG and with a modified value.
   */
  #define AVERROR_BUG2               FFERRTAG( 'B','U','G',' ')
  #define AVERROR_UNKNOWN            FFERRTAG( 'U','N','K','N') ///< Unknown error, typically from an external library
  #define AVERROR_EXPERIMENTAL       (-0x2bb2afa8) ///< Requested feature is flagged experimental. Set strict_std_compliance if you really want to use it.
  #define AVERROR_INPUT_CHANGED      (-0x636e6701) ///< Input changed between calls. Reconfiguration is required. (can be OR-ed with AVERROR_OUTPUT_CHANGED)
  #define AVERROR_OUTPUT_CHANGED     (-0x636e6702) ///< Output changed between calls. Reconfiguration is required. (can be OR-ed with AVERROR_INPUT_CHANGED)
  /* HTTP & RTSP errors */
  #define AVERROR_HTTP_BAD_REQUEST   FFERRTAG(0xF8,'4','0','0')
  #define AVERROR_HTTP_UNAUTHORIZED  FFERRTAG(0xF8,'4','0','1')
  #define AVERROR_HTTP_FORBIDDEN     FFERRTAG(0xF8,'4','0','3')
  #define AVERROR_HTTP_NOT_FOUND     FFERRTAG(0xF8,'4','0','4')
  #define AVERROR_HTTP_OTHER_4XX     FFERRTAG(0xF8,'4','X','X')
  #define AVERROR_HTTP_SERVER_ERROR  FFERRTAG(0xF8,'5','X','X')
  
  #define AV_ERROR_MAX_STRING_SIZE 64
  
  /**
   * Put a description of the AVERROR code errnum in errbuf.
   * In case of failure the global variable errno is set to indicate the
   * error. Even in case of failure av_strerror() will print a generic
   * error message indicating the errnum provided to errbuf.
   *
   * @param errnum      error code to describe
   * @param errbuf      buffer to which description is written
   * @param errbuf_size the size in bytes of errbuf
   * @return 0 on success, a negative value if a description for errnum
   * cannot be found
   */
  int av_strerror(int errnum, char *errbuf, size_t errbuf_size);
  
  /**
   * Fill the provided buffer with a string containing an error string
   * corresponding to the AVERROR code errnum.
   *
   * @param errbuf         a buffer
   * @param errbuf_size    size in bytes of errbuf
   * @param errnum         error code to describe
   * @return the buffer in input, filled with the error description
   * @see av_strerror()
   */
  static inline char *av_make_error_string(char *errbuf, size_t errbuf_size, int errnum)
  {
      av_strerror(errnum, errbuf, errbuf_size);
      return errbuf;
  }
  
  /**
   * Convenience macro, the return value should be used only directly in
   * function arguments but never stand-alone.
   */
  #define av_err2str(errnum) \
      av_make_error_string((char[AV_ERROR_MAX_STRING_SIZE]){0}, AV_ERROR_MAX_STRING_SIZE, errnum)
  
  /**
   * @}
   */
  
  #endif /* AVUTIL_ERROR_H */
  