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-rw-r--r--Game/Code/lib/ffmpeg/rational.pas92
1 files changed, 73 insertions, 19 deletions
diff --git a/Game/Code/lib/ffmpeg/rational.pas b/Game/Code/lib/ffmpeg/rational.pas
index 86dbf8a4..14edb799 100644
--- a/Game/Code/lib/ffmpeg/rational.pas
+++ b/Game/Code/lib/ffmpeg/rational.pas
@@ -16,24 +16,33 @@
* 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 *)
+
+(* 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 *)
+
+// Revision: 10765
unit rational;
+
{$IFDEF FPC}
- {$MODE DELPHI} (* CAT *)
- {$PACKENUM 4} (* every enum type variables uses 4 bytes, CAT *)
- {$PACKRECORDS C} (* GCC compatible, Record Packing, CAT *)
+ {$MODE DELPHI}
+ {$PACKENUM 4} (* use 4-byte enums *)
+ {$PACKRECORDS C} (* C/C++-compatible record packing *)
+{$ELSE}
+ {$MINENUMSIZE 4} (* use 4-byte enums *)
{$ENDIF}
-interface (* unit windows is deleted by CAT *)
+interface
-{$I version.inc}
+uses
+ UConfig;
type
(*
- * Rational number num/den. *)
+ * Rational number num/den.
+ *)
PAVRational = ^TAVRational;
TAVRational = record
num: integer; ///< numerator
@@ -41,32 +50,75 @@ type
end;
(**
- * returns 0 if a==b, 1 if a>b and -1 if a<b.
+ * Compare two rationals.
+ * @param a first rational
+ * @param b second rational
+ * @return 0 if a==b, 1 if a>b and -1 if a<b.
*)
-function av_cmp_q(a: TAVRational; b: TAVRational): integer;
+function av_cmp_q(a: TAVRational; b: TAVRational): integer; inline;
(**
- * converts the given AVRational to a double.
+ * Rational to double conversion.
+ * @param a rational to convert
+ * @return (double) a
*)
-function av_q2d(a: TAVRational): double;
+function av_q2d(a: TAVRational): double; inline;
(**
- * reduce a fraction.
- * this is usefull for framerate calculations
+ * Reduce a fraction.
+ * This is useful for framerate calculations.
+ * @param dst_nom destination numerator
+ * @param dst_den destination denominator
+ * @param nom source numerator
+ * @param den source denominator
* @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;
+function av_reduce(dst_nom: PInteger; dst_den: PInteger; nom: int64; den: int64; max: int64): integer;
cdecl; external av__util;
+(**
+ * Multiplies two rationals.
+ * @param b first rational.
+ * @param c second rational.
+ * @return b*c.
+ *)
function av_mul_q(b: TAVRational; c: TAVRational): TAVRational;
cdecl; external av__util;
+
+(**
+ * Divides one rational by another.
+ * @param b first rational.
+ * @param c second rational.
+ * @return b/c.
+ *)
function av_div_q(b: TAVRational; c: TAVRational): TAVRational;
cdecl; external av__util;
+
+(**
+ * Adds two rationals.
+ * @param b first rational.
+ * @param c second rational.
+ * @return b+c.
+ *)
function av_add_q(b: TAVRational; c: TAVRational): TAVRational;
cdecl; external av__util;
+
+(**
+ * Subtracts one rational from another.
+ * @param b first rational.
+ * @param c second rational.
+ * @return b-c.
+ *)
function av_sub_q(b: TAVRational; c: TAVRational): TAVRational;
cdecl; external av__util;
+
+(**
+ * Converts a double precision floating point number to a rational.
+ * @param d double to convert
+ * @param max the maximum allowed numerator and denominator
+ * @return (AVRational) d.
+ *)
function av_d2q(d: double; max: integer): TAVRational;
cdecl; external av__util;
@@ -76,10 +128,12 @@ function av_cmp_q (a: TAVRational; b: TAVRational): integer;
var
tmp: int64;
begin
- tmp := a.num * b.den - b.num * a.den;
+ tmp := a.num * int64(b.den) - b.num * int64(a.den);
- if tmp <> 0 then Result := (tmp shr 63) or 1 (* fixed by CAT *)
- else Result := 0
+ if (tmp <> 0) then
+ Result := (tmp shr 63) or 1
+ else
+ Result := 0
end;
function av_q2d(a: TAVRational): double;