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(*
* 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
*
* This is a part of the Pascal port of ffmpeg.
* - Changes and updates by the UltraStar Deluxe Team
*
* Conversion of libavutil/error.h
* Max. avutil version: 50.21.0, revision 24190, Wed Jul 21 01:00:00 2010 CET
*
*)
{$IF LIBAVUTIL_VERSION >= 50012000} // >= 50.12.0
{* error handling *}
const
{$IFDEF UNIX}
ENOENT = ESysENOENT;
EIO = ESysEIO;
ENOMEM = ESysENOMEM;
EINVAL = ESysEINVAL;
EDOM = ESysEDOM;
ENOSYS = ESysENOSYS;
EILSEQ = ESysEILSEQ;
EPIPE = ESysEPIPE;
{$ELSE}
ENOENT = 2;
EIO = 5;
ENOMEM = 12;
EINVAL = 22;
EPIPE = 32; // just an assumption. needs to be checked.
EDOM = 33;
{$IFDEF MSWINDOWS}
// Note: we assume that ffmpeg was compiled with MinGW.
// This must be changed if DLLs were compiled with cygwin.
ENOSYS = 40; // MSVC/MINGW: 40, CYGWIN: 88, LINUX/FPC: 38
EILSEQ = 42; // MSVC/MINGW: 42, CYGWIN: 138, LINUX/FPC: 84
{$ENDIF}
{$ENDIF}
(**
* We need the sign of the error, because some platforms have
* E* and errno already negated. The previous version failed
* with Delphi, because it needed EINVAL defined.
* Warning: This code is platform dependent and assumes constants
* to be 32 bit.
* This version does the following steps:
* 1) shr 30: shifts the sign bit to bit position 2
* 2) and $00000002: sets all other bits to zero
* positive EINVAL gives 0, negative gives 2
* 3) not: inverts all bits. This gives -1 and -3
* 3) - 1: positive EINVAL gives -1, negative 1
*)
const
AVERROR_SIGN = (EINVAL shr 30) and $00000002 - 1;
(*
#if EINVAL > 0
#define AVERROR(e) (-(e)) {**< Returns a negative error code from a POSIX error code, to return from library functions. *}
#define AVUNERROR(e) (-(e)) {**< Returns a POSIX error code from a library function error return value. *}
#else
{* Some platforms have E* and errno already negated. *}
#define AVERROR(e) (e)
#define AVUNERROR(e) (e)
#endif
*)
const
AVERROR_UNKNOWN = AVERROR_SIGN * EINVAL; (**< unknown error *)
AVERROR_IO = AVERROR_SIGN * EIO; (**< I/O error *)
AVERROR_NUMEXPECTED = AVERROR_SIGN * EDOM; (**< Number syntax expected in filename. *)
AVERROR_INVALIDDATA = AVERROR_SIGN * EINVAL; (**< invalid data found *)
AVERROR_NOMEM = AVERROR_SIGN * ENOMEM; (**< not enough memory *)
AVERROR_NOFMT = AVERROR_SIGN * EILSEQ; (**< unknown format *)
AVERROR_NOTSUPP = AVERROR_SIGN * ENOSYS; (**< Operation not supported. *)
AVERROR_NOENT = AVERROR_SIGN * ENOENT; (**< No such file or directory. *)
{$IF LIBAVCODEC_VERSION >= 52017000} // 52.17.0
AVERROR_EOF = AVERROR_SIGN * EPIPE; (**< End of file. *)
{$IFEND}
// Note: function calls as constant-initializers are invalid
//AVERROR_PATCHWELCOME = -MKTAG('P','A','W','E'); {**< Not yet implemented in FFmpeg. Patches welcome. *}
AVERROR_PATCHWELCOME = -(ord('P') or (ord('A') shl 8) or (ord('W') shl 16) or (ord('E') shl 24));
{$IFEND}
{$IF LIBAVUTIL_VERSION >= 50013000} // >= 50.13.0
(*
* Put a description of the AVERROR code errnum in errbuf.
* In case of failure the global variable errno is set to indicate the
* error. Even in case of failure av_strerror() will print a generic
* error message indicating the errnum provided to errbuf.
*
* @param errnum error code to describe
* @param errbuf buffer to which description is written
* @param errbuf_size the size in bytes of errbuf
* @return 0 on success, a negative value if a description for errnum
* cannot be found
*)
function av_strerror(errnum: cint; errbuf: Pchar; errbuf_size: cint): cint;
cdecl; external av__util;
{$IFEND}
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