This is the first complete try of libavutil.

git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/trunk@3004 b956fd51-792f-4845-bead-9b4dfca2ff2c

13 files changed, 568 insertions, 9 deletions

diff --git a/src/lib/ffmpeg-2.0/How to update the ffmpeg files.txt b/src/lib/ffmpeg-2.0/How to update the ffmpeg files.txt
new file mode 100644
index 00000000..7e376454
--- /dev/null
+++ b/src/lib/ffmpeg-2.0/How to update the ffmpeg files.txt
@@ -0,0 +1,17 @@
+how to update the ffmpeg files:
+
+1)	cpu.pas
+	dict.pas
+	error.pas
+	log.pas
+	mathematics.pas
+	mem.pas
+	opt.pas
+	pixfmt.pas
+	samplefmt.pas
+2)	rational.pas
+3)	avutil.pas
+4)	avcodec.pas
+5)	avio.pas
+	swscale.pas
+6)	avformat.pas
\ No newline at end of file
diff --git a/src/lib/ffmpeg-2.0/ToDo.txt b/src/lib/ffmpeg-2.0/ToDo.txt
new file mode 100644
index 00000000..44a1a058
--- /dev/null
+++ b/src/lib/ffmpeg-2.0/ToDo.txt
@@ -0,0 +1,11 @@
+1)	avutil.pas
+
+from mem.pas:
+inline function av_x_if_null
+inline function av_size_mult
+
+from log.pas:
+inline function av_log
+inline function av_log_set_callback
+inline function av_log_default_callback
+inline function av_dlog
diff --git a/src/lib/ffmpeg-2.0/avutil.pas b/src/lib/ffmpeg-2.0/avutil.pas
new file mode 100644
index 00000000..4383797d
--- /dev/null
+++ b/src/lib/ffmpeg-2.0/avutil.pas
@@ -0,0 +1,324 @@
+(*
+ * copyright (c) 2006 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
+ *
+ * Conversions of
+ *
+ * libavutil/avutil.h:
+ * version: 52.38.100
+ *
+ *)
+
+unit avutil;
+
+{$IFDEF FPC}
+  {$MODE DELPHI}
+  {$PACKENUM 4}    (* use 4-byte enums *)
+  {$PACKRECORDS C} (* C/C++-compatible record packing *)
+{$ELSE}
+  {$MINENUMSIZE 4} (* use 4-byte enums *)
+{$ENDIF}
+
+{$IFDEF DARWIN}
+  {$linklib libavutil}
+{$ENDIF}
+
+interface
+
+uses
+  ctypes,
+  rational,
+  {$IFDEF UNIX}
+  BaseUnix,
+  {$ENDIF}
+  UConfig;
+
+const
+  (* Max. supported version by this header *)
+  LIBAVUTIL_MAX_VERSION_MAJOR   = 52;
+  LIBAVUTIL_MAX_VERSION_MINOR   = 38;
+  LIBAVUTIL_MAX_VERSION_RELEASE = 100;
+  LIBAVUTIL_MAX_VERSION = (LIBAVUTIL_MAX_VERSION_MAJOR * VERSION_MAJOR) +
+                          (LIBAVUTIL_MAX_VERSION_MINOR * VERSION_MINOR) +
+                          (LIBAVUTIL_MAX_VERSION_RELEASE * VERSION_RELEASE);
+
+  (* Min. supported version by this header *)
+  LIBAVUTIL_MIN_VERSION_MAJOR   = 52;
+  LIBAVUTIL_MIN_VERSION_MINOR   = 38;
+  LIBAVUTIL_MIN_VERSION_RELEASE = 0;
+  LIBAVUTIL_MIN_VERSION = (LIBAVUTIL_MIN_VERSION_MAJOR * VERSION_MAJOR) +
+                          (LIBAVUTIL_MIN_VERSION_MINOR * VERSION_MINOR) +
+                          (LIBAVUTIL_MIN_VERSION_RELEASE * VERSION_RELEASE);
+
+(* Check if linked versions are supported *)
+{$IF (LIBAVUTIL_VERSION < LIBAVUTIL_MIN_VERSION)}
+  {$MESSAGE Error 'Linked version of libavutil is too old!'}
+{$IFEND}
+
+{$IF (LIBAVUTIL_VERSION > LIBAVUTIL_MAX_VERSION)}
+  {$MESSAGE Error 'Linked version of libavutil is not yet supported!'}
+{$IFEND}
+
+type
+{$IFNDEF FPC}
+  // defines for Delphi
+  size_t = cardinal;
+{$ENDIF}
+  Psize_t = ^size_t;
+
+(**
+ * Return the LIBAVUTIL_VERSION_INT constant.
+ *)
+function avutil_version(): cuint;
+  cdecl; external av__util;
+
+(**
+ * Return the libavutil build-time configuration.
+ *)
+function avutil_configuration(): PAnsiChar;
+  cdecl; external av__util;
+
+(**
+ * Return the libavutil license.
+ *)
+function avutil_license(): PAnsiChar;
+  cdecl; external av__util;
+
+(**
+ * @addtogroup lavu_media Media Type
+ * @brief Media Type
+ *)
+
+type
+  TAVMediaType = (
+    AVMEDIA_TYPE_UNKNOWN = -1,  ///< Usually treated as AVMEDIA_TYPE_DATA
+    AVMEDIA_TYPE_VIDEO,
+    AVMEDIA_TYPE_AUDIO,
+    AVMEDIA_TYPE_DATA,          ///< Opaque data information usually continuous
+    AVMEDIA_TYPE_SUBTITLE,
+    AVMEDIA_TYPE_ATTACHMENT,    ///< Opaque data information usually sparse
+    AVMEDIA_TYPE_NB
+  );
+
+(**
+ * Return a string describing the media_type enum, NULL if media_type
+ * is unknown.
+ *)
+function av_get_media_type_string(media_type: TAVMediaType): PAnsiChar;
+  cdecl; external av__util;
+
+const
+  FF_LAMBDA_SHIFT = 7;
+  FF_LAMBDA_SCALE = (1 shl FF_LAMBDA_SHIFT);
+  FF_QP2LAMBDA    = 118; ///< factor to convert from H.263 QP to lambda
+  FF_LAMBDA_MAX   = (256*128-1);
+ 
+  FF_QUALITY_SCALE = FF_LAMBDA_SCALE; //FIXME maybe remove
+ 
+(**
+ * @brief Undefined timestamp value
+ *
+ * Usually reported by demuxer that work on containers that do not provide
+ * either pts or dts.
+ *)
+
+  AV_NOPTS_VALUE   = $8000000000000000;
+
+(**
+ * Internal time base represented as integer
+ *)
+
+  AV_TIME_BASE     = 1000000;
+  
+(**
+ * Internal time base represented as fractional value
+ *)
+
+  AV_TIME_BASE_Q   : TAVRational = (num: 1; den: AV_TIME_BASE);
+
+(**
+ * @}
+ * @}
+ * @defgroup lavu_picture Image related
+ *
+ * AVPicture types, pixel formats and basic image planes manipulation.
+ *
+ * @{
+ *)
+
+type
+  TAVPictureType = (
+    AV_PICTURE_TYPE_NONE = 0, ///< Undefined
+    AV_PICTURE_TYPE_I,     ///< Intra
+    AV_PICTURE_TYPE_P,     ///< Predicted
+    AV_PICTURE_TYPE_B,     ///< Bi-dir predicted
+    AV_PICTURE_TYPE_S,     ///< S(GMC)-VOP MPEG4
+    AV_PICTURE_TYPE_SI,    ///< Switching Intra
+    AV_PICTURE_TYPE_SP,    ///< Switching Predicted
+    AV_PICTURE_TYPE_BI     ///< BI type
+  );
+
+(**
+ * Return a single letter to describe the given picture type
+ * pict_type.
+ *
+ * @param[in] pict_type the picture type @return a single character
+ * representing the picture type, '?' if pict_type is unknown
+ *)
+function av_get_picture_type_char(pict_type: TAVPictureType): PAnsiChar;
+  cdecl; external av__util;
+
+(**
+ * Return x default pointer in case p is NULL.
+ *)
+function av_x_if_null(p: {const} pointer; x: {const} pointer): pointer; {$IFDEF HasInline}inline;{$ENDIF}
+
+(**
+ * Compute the length of an integer list.
+ *
+ * @param elsize  size in bytes of each list element (only 1, 2, 4 or 8)
+ * @param term    list terminator (usually 0 or -1)
+ * @param list    pointer to the list
+ * @return  length of the list, in elements, not counting the terminator
+ *)
+function av_int_list_length_for_size(elsize: cuint;
+                                     {const} list: pointer; term: cuint64): cuint; {av_pure}
+  cdecl; external av__util;
+
+(**
+ * Compute the length of an integer list.
+ *
+ * @param term  list terminator (usually 0 or -1)
+ * @param list  pointer to the list
+ * @return  length of the list, in elements, not counting the terminator
+ *)
+function av_int_list_length({const} list: pointer; term: cuint64): cuint;
+
+{$INCLUDE libavutil/cpu.pas}
+
+{$INCLUDE libavutil/dict.pas}
+
+{$INCLUDE libavutil/error.pas}
+
+{$INCLUDE libavutil/mathematics.pas}
+
+{$INCLUDE libavutil/mem.pas}
+
+{$INCLUDE libavutil/opt.pas}
+
+{$INCLUDE libavutil/log.pas}
+
+{$INCLUDE libavutil/pixfmt.pas}
+
+{$INCLUDE libavutil/samplefmt.pas}
+
+(* libavutil/common.h *) // until now MKTAG and MKBETAG is all from common.h KMS 19/5/2010
+
+(**
+ * MKTAG and MKBETAG are usually used to convert a magic string to an enumeration index.
+ * In Pascal this can probably not be used and the functions could be removed.
+ * KMS 8/6/2012
+ *)
+function MKTAG  (a, b, c, d: AnsiChar): integer; {$IFDEF HasInline}inline;{$ENDIF}
+function MKBETAG(a, b, c, d: AnsiChar): integer; {$IFDEF HasInline}inline;{$ENDIF}
+
+implementation
+
+function av_x_if_null(p: {const} pointer; x: {const} pointer): pointer; {$IFDEF HasInline}inline;{$ENDIF}
+begin
+  if p = nil then
+    Result := x
+  else
+    Result := p;
+end;
+
+function av_int_list_length({const} list: pointer; term: cuint64): cuint;
+begin
+  // KMS 2013: It is not really clear whether it should be sizeof(pointer) or sizeof(cint).
+  // Going for the larger one (pointer) should at least prevent buffer overflows.
+  // So, the result is either 4 byte or 8 byte.
+  Result := av_int_list_length_for_size(sizeof(pointer), list, term);
+end;
+
+(* libavutil/common.h *)
+
+function MKTAG(a, b, c, d: AnsiChar): integer; {$IFDEF HasInline}inline;{$ENDIF}
+begin
+  Result := (ord(a) or (ord(b) shl 8) or (ord(c) shl 16) or (ord(d) shl 24));
+end;
+
+function MKBETAG(a, b, c, d: AnsiChar): integer; {$IFDEF HasInline}inline;{$ENDIF}
+begin
+  Result := (ord(d) or (ord(c) shl 8) or (ord(b) shl 16) or (ord(a) shl 24));
+end;
+
+(* libavutil/error.h *)
+
+function av_make_error_string(errbuf: Pchar; errbuf_size: size_t; errnum: cint): Pchar; {$IFDEF HasInline}inline;{$ENDIF}
+begin
+  av_strerror(errnum, errbuf, errbuf_size);
+  av_make_error_string := errbuf;
+end;
+
+function av_err2str(errnum: cint): pchar; {$IFDEF HasInline}inline;{$ENDIF}
+var
+  errbuf: Pchar;
+begin
+  errbuf := stralloc(AV_ERROR_MAX_STRING_SIZE);
+  av_make_error_string(errbuf, AV_ERROR_MAX_STRING_SIZE, errnum);
+end;
+
+(* libavutil/mem.h *)
+
+function av_size_mult(a: size_t; b: size_t; r: Psize_t): size_t;
+  cdecl; external av__util;
+(* To Be Implemented, March 2012 KMS *)
+//function av_size_mult(a: size_t; b: size_t; r: pointer): size_t;
+//begin
+//    {
+//    size_t t = a * b;
+//    /* Hack inspired from glibc: only try the division if nelem and elsize
+//     * are both greater than sqrt(SIZE_MAX). */
+//    if ((a | b) >= ((size_t)1 << (sizeof(size_t) * 4)) && a && t / a != b)
+//        return AVERROR(EINVAL);
+//    *r = t;
+//    return 0;
+//}
+//end;
+
+function av_malloc_array(nmemb: size_t; size: size_t): pointer; {$IFDEF HasInline}inline;{$ENDIF} {av_alloc_size(1,2)}
+begin
+  if (size <= 0 ) or (nmemb >= maxint / size) then
+    av_malloc_array := NIL
+  else
+    av_malloc_array := av_malloc(nmemb * size);
+end;
+
+function av_mallocz_array(nmemb: size_t; size: size_t): pointer; {$IFDEF HasInline}inline;{$ENDIF} {av_alloc_size(1,2)}
+begin
+  if (size <= 0 ) or (nmemb >= maxint / size) then
+    av_mallocz_array := NIL
+  else
+    av_mallocz_array := av_mallocz(nmemb * size);
+end;
+
+end.
diff --git a/src/lib/ffmpeg-2.0/libavutil/cpu.pas b/src/lib/ffmpeg-2.0/libavutil/cpu.pas
index 4977131f..635b8928 100644
--- a/src/lib/ffmpeg-2.0/libavutil/cpu.pas
+++ b/src/lib/ffmpeg-2.0/libavutil/cpu.pas
@@ -19,7 +19,7 @@
  * - Changes and updates by the UltraStar Deluxe Team
  *
  * Conversion of libavutil/cpu.h
- * avutil version 52.13.100
+ * avutil version 52.38.100
  *
  *)
 
diff --git a/src/lib/ffmpeg-2.0/libavutil/dict.pas b/src/lib/ffmpeg-2.0/libavutil/dict.pas
index 9838c9b6..21886657 100644
--- a/src/lib/ffmpeg-2.0/libavutil/dict.pas
+++ b/src/lib/ffmpeg-2.0/libavutil/dict.pas
@@ -19,7 +19,7 @@
  * This is a part of the Pascal port of ffmpeg.
  *
  * Conversion of libavutil/dict.h
- * avutil version 52.13.100
+ * avutil version 52.38.100
  *
  *)
 
diff --git a/src/lib/ffmpeg-2.0/libavutil/error.pas b/src/lib/ffmpeg-2.0/libavutil/error.pas
index 46dbe51a..4406c2cd 100644
--- a/src/lib/ffmpeg-2.0/libavutil/error.pas
+++ b/src/lib/ffmpeg-2.0/libavutil/error.pas
@@ -19,7 +19,7 @@
  * - Changes and updates by the UltraStar Deluxe Team
  *
  * Conversion of libavutil/error.h
- * avutil version 52.13.100
+ * avutil version 52.38.100
  *
  *)
 
diff --git a/src/lib/ffmpeg-2.0/libavutil/log.pas b/src/lib/ffmpeg-2.0/libavutil/log.pas
index 9cd709f8..73057a36 100644
--- a/src/lib/ffmpeg-2.0/libavutil/log.pas
+++ b/src/lib/ffmpeg-2.0/libavutil/log.pas
@@ -19,7 +19,7 @@
  * - Changes and updates by the UltraStar Deluxe Team
  *
  * Conversion of libavutil/log.h
- * avutil version 52.13.100
+ * avutil version 52.38.100
  *
  *)
 
diff --git a/src/lib/ffmpeg-2.0/libavutil/mathematics.pas b/src/lib/ffmpeg-2.0/libavutil/mathematics.pas
index 7dcb5e1e..60c9e16c 100644
--- a/src/lib/ffmpeg-2.0/libavutil/mathematics.pas
+++ b/src/lib/ffmpeg-2.0/libavutil/mathematics.pas
@@ -22,7 +22,7 @@
  * - Changes and updates by the UltraStar Deluxe Team
  *
  * Conversion of libavutil/mathematics.h
- * avutil version 52.13.100
+ * avutil version 52.38.100
  *
  *)
 
diff --git a/src/lib/ffmpeg-2.0/libavutil/mem.pas b/src/lib/ffmpeg-2.0/libavutil/mem.pas
index ca1b8643..17c3461c 100644
--- a/src/lib/ffmpeg-2.0/libavutil/mem.pas
+++ b/src/lib/ffmpeg-2.0/libavutil/mem.pas
@@ -19,7 +19,7 @@
  * - Changes and updates by the UltraStar Deluxe Team
  *
  * Conversion of libavutil/mem.h
- * avutil version 52.13.100
+ * avutil version 52.38.100
  *
  *)
 
diff --git a/src/lib/ffmpeg-2.0/libavutil/opt.pas b/src/lib/ffmpeg-2.0/libavutil/opt.pas
index fd865eea..983e923b 100644
--- a/src/lib/ffmpeg-2.0/libavutil/opt.pas
+++ b/src/lib/ffmpeg-2.0/libavutil/opt.pas
@@ -23,7 +23,7 @@
  * - Changes and updates by the UltraStar Deluxe Team
  *
  * Conversion of libavutil/opt.h
- * avutil version 52.13.100
+ * avutil version 52.38.100
  *
  *)
 
diff --git a/src/lib/ffmpeg-2.0/libavutil/pixfmt.pas b/src/lib/ffmpeg-2.0/libavutil/pixfmt.pas
index 1128de1e..c80e13d1 100644
--- a/src/lib/ffmpeg-2.0/libavutil/pixfmt.pas
+++ b/src/lib/ffmpeg-2.0/libavutil/pixfmt.pas
@@ -19,7 +19,7 @@
  * - Changes and updates by the UltraStar Deluxe Team
  *
  * Conversion of libavutil/pixfmt.h
- * avutil version 52.13.100
+ * avutil version 52.38.100
  *
  *)
 
diff --git a/src/lib/ffmpeg-2.0/libavutil/samplefmt.pas b/src/lib/ffmpeg-2.0/libavutil/samplefmt.pas
index 62241bc4..877d6207 100644
--- a/src/lib/ffmpeg-2.0/libavutil/samplefmt.pas
+++ b/src/lib/ffmpeg-2.0/libavutil/samplefmt.pas
@@ -19,7 +19,7 @@
  * This is a part of the Pascal port of ffmpeg.
  *
  * Conversion of libavutil/samplefmt.h
- * avutil version 52.13.100
+ * avutil version 52.38.100
  *
  *)
 
diff --git a/src/lib/ffmpeg-2.0/rational.pas b/src/lib/ffmpeg-2.0/rational.pas
new file mode 100644
index 00000000..54319362
--- /dev/null
+++ b/src/lib/ffmpeg-2.0/rational.pas
@@ -0,0 +1,207 @@
+(*
+ * rational numbers
+ * Copyright (c) 2003 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/rational.h
+ * avutil version 52.38.100
+ *
+ *)
+
+unit rational;
+
+{$IFDEF FPC}
+  {$MODE DELPHI}
+  {$PACKENUM 4}    (* use 4-byte enums *)
+  {$PACKRECORDS C} (* C/C++-compatible record packing *)
+{$ELSE}
+  {$MINENUMSIZE 4} (* use 4-byte enums *)
+{$ENDIF}
+
+{$I switches.inc}
+
+interface
+
+uses
+  ctypes,
+  UConfig;
+
+(**
+ * @addtogroup lavu_math
+ * @{
+ *)
+
+type
+(**
+ * rational number numerator/denominator
+ *)
+  PAVRational = ^TAVRational;
+  TAVRational = record
+    num: cint; ///< numerator
+    den: cint; ///< denominator
+  end;
+
+  TAVRationalArray = array[0 .. (MaxInt div SizeOf(TAVRational))-1] of TAVRational;
+  PAVRationalArray = ^TAVRationalArray;
+
+(**
+ * Compare two rationals.
+ * @param a first rational
+ * @param b second rational
+ * @return 0 if a==b, 1 if a>b, -1 if a<b, and INT_MIN if one of the
+ * values is of the form 0/0
+ *)
+function av_cmp_q(a: TAVRational; b: TAVRational): cint; {$IFDEF HasInline}inline;{$ENDIF}
+
+(**
+ * Convert rational to double.
+ * @param a rational to convert
+ * @return (double) a
+ *)
+function av_q2d(a: TAVRational): cdouble; {$IFDEF HasInline}inline;{$ENDIF}
+
+(**
+ * Reduce a fraction.
+ * This is useful for framerate calculations.
+ * @param dst_num destination numerator
+ * @param dst_den destination denominator
+ * @param num source numerator
+ * @param den source denominator
+ * @param max the maximum allowed for dst_num & dst_den
+ * @return 1 if exact, 0 otherwise
+ *)
+function av_reduce(dst_num: PCint; dst_den: PCint; num: cint64; den: cint64; max: cint64): cint;
+  cdecl; external av__util;
+
+(**
+ * Multiply 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; {av_const}
+
+(**
+ * Divide 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; {av_const}
+
+(**
+ * Add 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; {av_const}
+
+(**
+ * Subtract 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; {av_const}
+
+(**
+ * Invert a rational.
+ * @param q value
+ * @return 1 / q
+ *)
+function av_inv_q(q: TAVRational): TAVRational; {$IFDEF HasInline}inline;{$ENDIF}
+
+(**
+ * Convert a double precision floating point number to a rational.
+ * inf is expressed as {1,0} or {-1,0} depending on the sign.
+ *
+ * @param d double to convert
+ * @param max the maximum allowed numerator and denominator
+ * @return (AVRational) d
+ *)
+function av_d2q(d: cdouble; max: cint): TAVRational;
+  cdecl; external av__util; {av_const}
+
+(**
+ * @return 1 if q1 is nearer to q than q2, -1 if q2 is nearer
+ * than q1, 0 if they have the same distance.
+ *)
+function av_nearer_q(q, q1, q2: TAVRational): cint;
+  cdecl; external av__util;
+
+(**
+ * Find the nearest value in q_list to q.
+ * @param q_list an array of rationals terminated by {0, 0}
+ * @return the index of the nearest value found in the array
+ *)
+function av_find_nearest_q_idx(q: TAVRational; q_list: {const} PAVRationalArray): cint;
+  cdecl; external av__util;
+
+implementation
+
+function av_cmp_q (a: TAVRational; b: TAVRational): cint; {$IFDEF HasInline}inline;{$ENDIF}
+var
+  tmp: cint64;
+begin
+  tmp := a.num * cint64(b.den) - b.num * cint64(a.den);
+
+{ old version
+  if (tmp <> 0) then
+    Result := (tmp shr 63) or 1
+  else
+    Result := 0;
+}
+{ C original:
+    if(tmp) return ((tmp ^ a.den ^ b.den)>>63)|1;
+    else if(b.den && a.den) return 0;
+    else if(a.num && b.num) return (a.num>>31) - (b.num>>31);
+    else                    return INT_MIN;
+}
+
+  if tmp <> 0 then
+    Result := ((tmp xor a.den xor b.den) shr 63) or 1
+  else if (b.den and a.den) <> 0 then
+    Result := 0
+  else if (a.num and b.num) <> 0 then
+    Result := (a.num shr 31) - (b.num shr 31)
+  else
+    Result := low(cint);
+
+end;
+
+function av_q2d(a: TAVRational): cdouble; {$IFDEF HasInline}inline;{$ENDIF}
+begin
+  Result := a.num / a.den;
+end;
+
+function av_inv_q(q: TAVRational): TAVRational; {$IFDEF HasInline}inline;{$ENDIF}
+begin
+  Result.num := q.den;
+  Result.den := q.num;
+end;
+
+end.