From 89ac41a2ccb85d6dfccb501ff4877231cab72094 Mon Sep 17 00:00:00 2001
From: tobigun <tobigun@b956fd51-792f-4845-bead-9b4dfca2ff2c>
Date: Tue, 5 Feb 2008 13:43:38 +0000
Subject: Update of the ffmpeg headers to their current trunk versions.
 IMPORTANT: parameter of av_free_packet is a pointer now   procedure
 av_free_packet (pkt: PAVPacket); as it is with av_free() and av_freep()

git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/trunk@814 b956fd51-792f-4845-bead-9b4dfca2ff2c
---
 Game/Code/lib/ffmpeg/rational.pas | 92 +++++++++++++++++++++++++++++++--------
 1 file changed, 73 insertions(+), 19 deletions(-)

(limited to 'Game/Code/lib/ffmpeg/rational.pas')

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;
-- 
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