unit mathematics;
interface
(*
* copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*)
(* This is a part of Pascal porting of ffmpeg. Originally by Victor Zinetz for Delphi and Free Pascal on Windows.
For Mac OS X, some modifications were made by The Creative CAT, denoted as CAT
in the source codes *)
{$IFDEF FPC}
{$IFDEF LINUX}
{$LINKLIB libavutil}
{$ENDIF}
{$MODE DELPHI } (* CAT *)
{$PACKENUM 4} (* every enum type variables uses 4 bytes, CAT *)
{$PACKRECORDS C} (* GCC compatible, Record Packing, CAT *)
{$ENDIF}
uses
rational; (* CAT *)
const
{$IFDEF MSWINDOWS}
av__util = 'avutil-49.dll';
{$ENDIF}
{$IFDEF LINUX}
av__util = 'libavutil.so'; // .0d
{$ENDIF}
{$IFDEF DARWIN}
av__util = 'libavutil.dylib';
{$ENDIF}
type
TAVRounding = (
AV_ROUND_ZERO = 0, ///< round toward zero
AV_ROUND_INF = 1, ///< round away from zero
AV_ROUND_DOWN = 2, ///< round toward -infinity
AV_ROUND_UP = 3, ///< round toward +infinity
AV_ROUND_NEAR_INF = 5, ///< round to nearest and halfway cases away from zero
AV_ROUND_FUCKING = $FFFFFF
);
(** * rescale a 64bit integer with rounding to nearest.
* a simple a*b/c isn't possible as it can overflow *)
function av_rescale (a, b, c: int64): int64;
cdecl; external av__util;
(**
* rescale a 64bit integer with specified rounding.
* a simple a*b/c isn't possible as it can overflow *)
function av_rescale_rnd (a, b, c: int64; enum: TAVRounding): int64;
cdecl; external av__util;
(**
* rescale a 64bit integer by 2 rational numbers. *)
function av_rescale_q (a: int64; bq, cq: TAVRational): int64;
cdecl; external av__util;
implementation
end.
