(* * 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. * - Changes and updates by the UltraStar Deluxe Team *) (* * Conversion of libavutil/mathematics.h * revision 16844, Wed Jan 28 08:50:10 2009 UTC * * update, MiSchi, no code change * Fri Jun 12 2009 21:50:00 UTC *) { * update to * avutil max. version 50.05.1, Sun, Dec 6 24:00:00 2009 UTC * MiSchi } unit mathematics; {$IFDEF FPC} {$MODE DELPHI } {$PACKENUM 4} (* use 4-byte enums *) {$PACKRECORDS C} (* C/C++-compatible record packing *) {$ELSE} {$MINENUMSIZE 4} (* use 4-byte enums *) {$ENDIF} interface uses ctypes, rational, UConfig; const M_E = 2.7182818284590452354; // e M_LN2 = 0.69314718055994530942; // log_e 2 M_LN10 = 2.30258509299404568402; // log_e 10 M_PI = 3.14159265358979323846; // pi M_SQRT1_2 = 0.70710678118654752440; // 1/sqrt(2) {$IF LIBAVUTIL_VERSION >= 50005001} // >= 50.5.1 NAN = 0.0/0.0; INFINITY = 1.0/0.0; {$IFEND} type TAVRounding = ( AV_ROUND_ZERO = 0, ///< Round toward zero. AV_ROUND_INF = 1, ///< Round away from zero. AV_ROUND_DOWN = 2, ///< Round toward -infinity. AV_ROUND_UP = 3, ///< Round toward +infinity. AV_ROUND_NEAR_INF = 5 ///< Round to nearest and halfway cases away from zero. ); {$IF LIBAVUTIL_VERSION >= 49013000} // 49.13.0 (** * Returns the greatest common divisor of a and b. * If both a or b are 0 or either or both are <0 then behavior is * undefined. *) function av_gcd(a: cint64; b: cint64): cint64; cdecl; external av__util; {av_const} {$IFEND} (** * Rescales a 64-bit integer with rounding to nearest. * A simple a*b/c isn't possible as it can overflow. *) function av_rescale (a, b, c: cint64): cint64; cdecl; external av__util; {av_const} (** * Rescales a 64-bit integer with specified rounding. * A simple a*b/c isn't possible as it can overflow. *) function av_rescale_rnd (a, b, c: cint64; enum: TAVRounding): cint64; cdecl; external av__util; {av_const} (** * Rescales a 64-bit integer by 2 rational numbers. *) function av_rescale_q (a: cint64; bq, cq: TAVRational): cint64; cdecl; external av__util; {av_const} implementation end.