diff options
Diffstat (limited to '')
-rw-r--r-- | Game/Code/lib/ffmpeg/rational.pas | 184 |
1 files changed, 96 insertions, 88 deletions
diff --git a/Game/Code/lib/ffmpeg/rational.pas b/Game/Code/lib/ffmpeg/rational.pas index a996e1df..40d1f093 100644 --- a/Game/Code/lib/ffmpeg/rational.pas +++ b/Game/Code/lib/ffmpeg/rational.pas @@ -1,88 +1,96 @@ -(*
- * Rational numbers
- * Copyright (c) 2003 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
- *)
-unit rational;
-
-interface
-
-uses
- windows;
-
-const
- av__util = 'avutil-49.dll';
-
-type
-
-(*
- * Rational number num/den. *)
- PAVRational = ^TAVRational;
- TAVRational = record
- num: integer; ///< numerator
- den: integer; ///< denominator
- end;
-
-(**
- * returns 0 if a==b, 1 if a>b and -1 if a<b.
- *)
-function av_cmp_q(a: TAVRational; b: TAVRational): integer;
-
-(**
- * converts the given AVRational to a double.
- *)
-function av_q2d(a: TAVRational): double;
-
-(**
- * reduce a fraction.
- * this is usefull for framerate calculations
- * @param max the maximum allowed for dst_nom & dst_den
- * @return 1 if exact, 0 otherwise
- *)
-function av_reduce(dst_nom: pinteger; dst_den: PInteger; nom: int64; den: int64; max: int64): integer;
- cdecl; external av__util;
-
-function av_mul_q(b: TAVRational; c: TAVRational): TAVRational;
- cdecl; external av__util;
-function av_div_q(b: TAVRational; c: TAVRational): TAVRational;
- cdecl; external av__util;
-function av_add_q(b: TAVRational; c: TAVRational): TAVRational;
- cdecl; external av__util;
-function av_sub_q(b: TAVRational; c: TAVRational): TAVRational;
- cdecl; external av__util;
-function av_d2q(d: double; max: integer): TAVRational;
- cdecl; external av__util;
-
-implementation
-
-function av_cmp_q (a: TAVRational; b: TAVRational): integer;
-var
- tmp: int64;
-begin
- tmp := a.num * b.den - b.num * a.den;
-
- if tmp = 0 then
- Result := (tmp shr 63) or 1
- else
- Result := 0;
-end;
-
-function av_q2d(a: TAVRational): double;
-begin
- Result := a.num / a.den;
-end;
-
-end.
+(* + * Rational numbers + * Copyright (c) 2003 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 + *) +unit rational; + +interface + +{$IFDEF win32} +uses + windows; +{$endif} + +const + + {$IFDEF win32} + av__util = 'avutil-49.dll'; + {$ELSE} + av__util = 'libavutil.so'; // .0d + {$ENDIF} + + +type + +(* + * Rational number num/den. *) + PAVRational = ^TAVRational; + TAVRational = record + num: integer; ///< numerator + den: integer; ///< denominator + end; + +(** + * returns 0 if a==b, 1 if a>b and -1 if a<b. + *) +function av_cmp_q(a: TAVRational; b: TAVRational): integer; + +(** + * converts the given AVRational to a double. + *) +function av_q2d(a: TAVRational): double; + +(** + * reduce a fraction. + * this is usefull for framerate calculations + * @param max the maximum allowed for dst_nom & dst_den + * @return 1 if exact, 0 otherwise + *) +function av_reduce(dst_nom: pinteger; dst_den: PInteger; nom: int64; den: int64; max: int64): integer; + cdecl; external av__util; + +function av_mul_q(b: TAVRational; c: TAVRational): TAVRational; + cdecl; external av__util; +function av_div_q(b: TAVRational; c: TAVRational): TAVRational; + cdecl; external av__util; +function av_add_q(b: TAVRational; c: TAVRational): TAVRational; + cdecl; external av__util; +function av_sub_q(b: TAVRational; c: TAVRational): TAVRational; + cdecl; external av__util; +function av_d2q(d: double; max: integer): TAVRational; + cdecl; external av__util; + +implementation + +function av_cmp_q (a: TAVRational; b: TAVRational): integer; +var + tmp: int64; +begin + tmp := a.num * b.den - b.num * a.den; + + if tmp = 0 then + Result := (tmp shr 63) or 1 + else + Result := 0; +end; + +function av_q2d(a: TAVRational): double; +begin + Result := a.num / a.den; +end; + +end. |