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author | brunzelchen <brunzelchen@b956fd51-792f-4845-bead-9b4dfca2ff2c> | 2009-12-09 18:35:28 +0000 |
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committer | brunzelchen <brunzelchen@b956fd51-792f-4845-bead-9b4dfca2ff2c> | 2009-12-09 18:35:28 +0000 |
commit | e4f413fdcf003ac0ad20d145f61dd370994e79db (patch) | |
tree | 692f725464654d0a82cdb0888c28e4dd21d68517 /Medley/src/lib/ffmpeg/mathematics.pas | |
parent | d267ce95e1743fad0d383d1d7fe51e9b8bf5b66f (diff) | |
download | usdx-e4f413fdcf003ac0ad20d145f61dd370994e79db.tar.gz usdx-e4f413fdcf003ac0ad20d145f61dd370994e79db.tar.xz usdx-e4f413fdcf003ac0ad20d145f61dd370994e79db.zip |
just a first experimental version
git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/branches/experimental@2011 b956fd51-792f-4845-bead-9b4dfca2ff2c
Diffstat (limited to 'Medley/src/lib/ffmpeg/mathematics.pas')
-rw-r--r-- | Medley/src/lib/ffmpeg/mathematics.pas | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/Medley/src/lib/ffmpeg/mathematics.pas b/Medley/src/lib/ffmpeg/mathematics.pas new file mode 100644 index 00000000..f3a307b6 --- /dev/null +++ b/Medley/src/lib/ffmpeg/mathematics.pas @@ -0,0 +1,104 @@ +(* + * 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 +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. |