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authortobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c>2009-05-08 15:00:25 +0000
committertobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c>2009-05-08 15:00:25 +0000
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checkin of trunk-copy as base for cmake test
git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/branches/experimental@1716 b956fd51-792f-4845-bead-9b4dfca2ff2c
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+(*
+ * 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
+ *)
+
+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 *)
+{$ENDIF}
+
+interface
+
+uses
+ ctypes,
+ rational,
+ UConfig;
+
+const
+ M_E = 2.7182818284590452354; // e
+ M_LN2 = 0.69314718055994530942; // log_e 2
+ M_LN10 = 2.30258509299404568402; // log_e 10
+ M_PI = 3.14159265358979323846; // pi
+ M_SQRT1_2 = 0.70710678118654752440; // 1/sqrt(2)
+
+type
+ TAVRounding = (
+ AV_ROUND_ZERO = 0, ///< Round toward zero
+ AV_ROUND_INF = 1, ///< Round away from zero
+ AV_ROUND_DOWN = 2, ///< Round toward -infinity
+ AV_ROUND_UP = 3, ///< Round toward +infinity
+ AV_ROUND_NEAR_INF = 5 ///< Round to nearest and halfway cases away from zero
+ );
+
+{$IF LIBAVUTIL_VERSION >= 49013000} // 49.13.0
+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.
+