add swscale.pas

git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/trunk@2970 b956fd51-792f-4845-bead-9b4dfca2ff2c

2 files changed, 958 insertions, 0 deletions

diff --git a/src/lib/ffmpeg-1.0/swscale.pas b/src/lib/ffmpeg-1.0/swscale.pas
new file mode 100644
index 00000000..ea81338c
--- /dev/null
+++ b/src/lib/ffmpeg-1.0/swscale.pas
@@ -0,0 +1,480 @@
+(*
+ * Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * FFmpeg 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 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * FFmpeg Pascal port
+ * - Ported by the UltraStar Deluxe Team
+ *
+ * Conversion of libswscale/swscale.h
+ * version: 2.1.101
+ *)
+ 
+unit swscale;
+
+{$IFDEF FPC}
+  {$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}
+  {$linklib libswscale}
+{$ENDIF}
+
+interface
+
+uses
+  ctypes,
+  avutil,
+  avcodec,
+  UConfig;
+
+const
+(*
+ * IMPORTANT: The official FFmpeg C headers change very quickly. Often some
+ * of the data structures are changed so that they become incompatible with
+ * older header files. The Pascal headers have to be adjusted to those changes,
+ * otherwise the application might crash randomly or strange bugs (not
+ * necessarily related to video or audio due to buffer overflows etc.) might
+ * occur.
+ *
+ * In the past users reported problems with USDX that took hours to fix and
+ * the problem was an unsupported version of FFmpeg. So we decided to disable
+ * support for future versions of FFmpeg until the headers are revised by us
+ * for that version as they otherwise most probably will break USDX.
+ *
+ * If the headers do not yet support your FFmpeg version you may want to
+ * adjust the max. version numbers manually but please note: it may work but
+ * in many cases it does not. The USDX team does NOT PROVIDE ANY SUPPORT
+ * for the game if the MAX. VERSION WAS CHANGED.
+ *
+ * The only safe way to support new versions of FFmpeg is to add the changes
+ * of the FFmpeg git repository C headers to the Pascal headers.
+ * You can accelerate this process by posting a patch with the git changes
+ * translated to Pascal to our bug tracker (please join our IRC chat before
+ * you start working on it). Simply adjusting the max. versions is NOT a valid
+ * fix. 
+ *)
+
+  (* Max. supported version by this header *)
+  LIBSWSCALE_MAX_VERSION_MAJOR   =  2;
+  LIBSWSCALE_MAX_VERSION_MINOR   =  1;
+  LIBSWSCALE_MAX_VERSION_RELEASE =  101;
+  LIBSWSCALE_MAX_VERSION = (LIBSWSCALE_MAX_VERSION_MAJOR * VERSION_MAJOR) +
+                           (LIBSWSCALE_MAX_VERSION_MINOR * VERSION_MINOR) +
+                           (LIBSWSCALE_MAX_VERSION_RELEASE * VERSION_RELEASE);
+
+(* Check if linked versions are supported *)
+{$IF (LIBSWSCALE_VERSION > LIBSWSCALE_MAX_VERSION)}
+  {$MESSAGE Error 'Linked version of libswscale is not yet supported!'}
+{$IFEND}
+
+type
+  TQuadCintArray = array[0..3] of cint;
+  PQuadCintArray = ^TQuadCintArray;
+  TCintArray = array[0..0] of cint;
+  PCintArray = ^TCintArray;
+  TPCuint8Array = array[0..0] of PCuint8;
+  PPCuint8Array = ^TPCuint8Array;
+
+(* libswscale/version.h start *)
+
+const
+(**
+ * FF_API_* defines may be placed below to indicate public API that will be
+ * dropped at a future version bump. The defines themselves are not part of
+ * the public API and may change, break or disappear at any time.
+ *)
+{$ifndef FF_API_SWS_GETCONTEXT}
+  FF_API_SWS_GETCONTEXT = LIBSWSCALE_VERSION_MAJOR < 3;    
+{$endif}
+{$ifndef FF_API_SWS_CPU_CAPS}
+  FF_API_SWS_CPU_CAPS = LIBSWSCALE_VERSION_MAJOR < 3;    
+{$endif}
+{$ifndef FF_API_SWS_FORMAT_NAME}
+  FF_API_SWS_FORMAT_NAME = LIBSWSCALE_VERSION_MAJOR < 3;    
+{$endif}
+
+(* libswscale/version.h end *)
+
+(**
+ * Return the LIBSWSCALE_VERSION_INT constant.
+ *)
+function swscale_version(): cuint;
+  cdecl; external sw__scale;
+
+(**
+ * Return the libswscale build-time configuration.
+ *)
+function swscale_configuration(): PAnsiChar;
+  cdecl; external sw__scale;
+
+(**
+ * Return the libswscale license.
+ *)
+function swscale_license(): PAnsiChar;
+  cdecl; external sw__scale;
+
+const
+  (* values for the flags, the stuff on the command line is different *)
+  SWS_FAST_BILINEAR =    1;
+  SWS_BILINEAR      =    2;
+  SWS_BICUBIC       =    4;
+  SWS_X             =    8;
+  SWS_POINT         =  $10;
+  SWS_AREA          =  $20;
+  SWS_BICUBLIN      =  $40;
+  SWS_GAUSS         =  $80;
+  SWS_SINC          = $100;
+  SWS_LANCZOS       = $200;
+  SWS_SPLINE        = $400;
+
+  SWS_SRC_V_CHR_DROP_MASK  = $30000;
+  SWS_SRC_V_CHR_DROP_SHIFT = 16;
+
+  SWS_PARAM_DEFAULT        = 123456;
+
+  SWS_PRINT_INFO           = $1000;
+
+  // the following 3 flags are not completely implemented
+  // internal chrominace subsampling info
+  SWS_FULL_CHR_H_INT    = $2000;
+  // input subsampling info
+  SWS_FULL_CHR_H_INP    = $4000;
+  SWS_DIRECT_BGR        = $8000;
+  SWS_ACCURATE_RND      = $40000;
+  SWS_BITEXACT          = $80000;
+
+{$IF FF_API_SWS_CPU_CAPS}
+(**
+ * CPU caps are autodetected now, those flags
+ * are only provided for API compatibility.
+ *)
+  SWS_CPU_CAPS_MMX      = $80000000;
+  SWS_CPU_CAPS_MMXEXT   = $20000000;
+{$IF LIBSWSCALE_VERSION_MAJOR < 3}
+  SWS_CPU_CAPS_MMX2     = $20000000;
+{$IFEND}
+  SWS_CPU_CAPS_3DNOW    = $40000000;
+  SWS_CPU_CAPS_ALTIVEC  = $10000000;
+  SWS_CPU_CAPS_BFIN     = $01000000;
+  SWS_CPU_CAPS_SSE2     = $02000000;
+{$IFEND}
+
+  SWS_MAX_REDUCE_CUTOFF = 0.002;
+
+  SWS_CS_ITU709         = 1;
+  SWS_CS_FCC            = 4;
+  SWS_CS_ITU601         = 5;
+  SWS_CS_ITU624         = 5;
+  SWS_CS_SMPTE170M      = 5;
+  SWS_CS_SMPTE240M      = 7;
+  SWS_CS_DEFAULT        = 5;
+
+(**
+ * Return a pointer to yuv<->rgb coefficients for the given colorspace
+ * suitable for sws_setColorspaceDetails().
+ *
+ * @param colorspace One of the SWS_CS_* macros. If invalid,
+ * SWS_CS_DEFAULT is used.
+ *)
+function sws_getCoefficients(colorspace: cint): Pcint;
+  cdecl; external sw__scale;
+  
+type
+
+  // when used for filters they must have an odd number of elements
+  // coeffs cannot be shared between vectors
+  PSwsVector = ^TSwsVector;
+  TSwsVector = record
+    coeff: PCdouble;    // pointer to the list of coefficients
+    length: cint;       // number of coefficients in the vector
+  end;
+
+  // vectors can be shared
+  PSwsFilter = ^TSwsFilter;
+  TSwsFilter = record
+    lumH: PSwsVector;
+    lumV: PSwsVector;
+    chrH: PSwsVector;
+    chrV: PSwsVector;
+  end;
+
+  PSwsContext = ^TSwsContext;
+  TSwsContext = record
+    {internal structure}
+  end;
+
+(**
+ * Return a positive value if pix_fmt is a supported input format, 0
+ * otherwise.
+ *)
+function sws_isSupportedInput(pix_fmt: TAVPixelFormat): cint;
+  cdecl; external sw__scale;
+
+(**
+ * Return a positive value if pix_fmt is a supported output format, 0
+ * otherwise.
+ *)
+function sws_isSupportedOutput(pix_fmt: TAVPixelFormat): cint;
+  cdecl; external sw__scale;
+
+(**
+ * Allocate an empty SwsContext. This must be filled and passed to
+ * sws_init_context(). For filling see AVOptions, options.c and
+ * sws_setColorspaceDetails().
+ *)
+function sws_alloc_context(): PSwsContext;
+  cdecl; external sw__scale;
+
+(**
+ * Initialize the swscaler context sws_context.
+ *
+ * @return zero or positive value on success, a negative value on
+ * error
+ *)
+function sws_init_context(sws_context: PSwsContext; srcFilter: PSwsFilter; dstFilter: PSwsFilter): cint;
+  cdecl; external sw__scale;
+
+(**
+ * Free the swscaler context swsContext.
+ * If swsContext is NULL, then does nothing.
+ *)
+procedure sws_freeContext(swsContext: PSwsContext);
+  cdecl; external sw__scale;
+
+{$IF FF_API_SWS_GETCONTEXT}
+(**
+ * Allocate and return a SwsContext. You need it to perform
+ * scaling/conversion operations using sws_scale().
+ *
+ * @param srcW the width of the source image
+ * @param srcH the height of the source image
+ * @param srcFormat the source image format
+ * @param dstW the width of the destination image
+ * @param dstH the height of the destination image
+ * @param dstFormat the destination image format
+ * @param flags specify which algorithm and options to use for rescaling
+ * @return a pointer to an allocated context, or NULL in case of error
+ * @note this function is to be removed after a saner alternative is
+ *       written
+ * @deprecated Use sws_getCachedContext() instead.
+ *)
+function sws_getContext(srcW: cint; srcH: cint; srcFormat: TAVPixelFormat;
+                        dstW: cint; dstH: cint; dstFormat: TAVPixelFormat;
+                        flags: cint; srcFilter: PSwsFilter;
+                        dstFilter: PSwsFilter; param: PCdouble): PSwsContext;
+  cdecl; external sw__scale;
+{$IFEND}
+
+(**
+ * Scale the image slice in srcSlice and put the resulting scaled
+ * slice in the image in dst. A slice is a sequence of consecutive
+ * rows in an image.
+ *
+ * Slices have to be provided in sequential order, either in
+ * top-bottom or bottom-top order. If slices are provided in
+ * non-sequential order the behavior of the function is undefined.
+ *
+ * @param c         the scaling context previously created with
+ *                  sws_getContext()
+ * @param srcSlice  the array containing the pointers to the planes of
+ *                  the source slice
+ * @param srcStride the array containing the strides for each plane of
+ *                  the source image
+ * @param srcSliceY the position in the source image of the slice to
+ *                  process, that is the number (counted starting from
+ *                  zero) in the image of the first row of the slice
+ * @param srcSliceH the height of the source slice, that is the number
+ *                  of rows in the slice
+ * @param dst       the array containing the pointers to the planes of
+ *                  the destination image
+ * @param dstStride the array containing the strides for each plane of
+ *                  the destination image
+ * @return          the height of the output slice
+ *)
+function sws_scale(c: PSwsContext; {const} srcSlice: PPCuint8Array;
+              {const} srcStride: PCintArray; srcSliceY: cint; srcSliceH: cint; 
+              {const} dst: PPCuint8Array; {const} dstStride: PCintArray): cint;
+  cdecl; external sw__scale;
+
+(**
+ * @param dstRange flag indicating the while-black range of the output (1=jpeg / 0=mpeg)
+ * @param srcRange flag indicating the while-black range of the input (1=jpeg / 0=mpeg)
+ * @param table the yuv2rgb coefficients describing the output yuv space, normally ff_yuv2rgb_coeffs[x]
+ * @param inv_table the yuv2rgb coefficients describing the input yuv space, normally ff_yuv2rgb_coeffs[x]
+ * @param brightness 16.16 fixed point brightness correction
+ * @param contrast 16.16 fixed point contrast correction
+ * @param saturation 16.16 fixed point saturation correction
+ * @return -1 if not supported
+ *)
+function sws_setColorspaceDetails(c: PSwsContext; inv_table: PQuadCintArray; 
+              srcRange: cint; table: PQuadCintArray; dstRange: cint;
+              brightness: cint; contrast: cint; saturation: cint): cint;
+  cdecl; external sw__scale;
+
+(**
+ * @return -1 if not supported
+ *)
+function sws_getColorspaceDetails(c: PSwsContext; var inv_table: PQuadCintArray;
+              var srcRange: cint; var table: PQuadCintArray; var dstRange: cint;
+              var brightness: cint; var contrast: cint; var saturation: cint): cint;
+  cdecl; external sw__scale;
+
+(**
+ * Allocate and return an uninitialized vector with length coefficients.
+ *)
+function sws_allocVec(length: cint): PSwsVector;
+  cdecl; external sw__scale;
+
+(**
+ * Return a normalized Gaussian curve used to filter stuff
+ * quality = 3 is high quality, lower is lower quality.
+ *)
+function sws_getGaussianVec(variance: cdouble; quality: cdouble): PSwsVector;
+  cdecl; external sw__scale;
+
+(**
+ * Allocate and return a vector with length coefficients, all
+ * with the same value c.
+ *)
+function sws_getConstVec(c: cdouble; length: cint): PSwsVector;
+  cdecl; external sw__scale;
+  
+(**
+ * Allocate and return a vector with just one coefficient, with
+ * value 1.0.
+ *)
+function sws_getIdentityVec: PSwsVector;
+  cdecl; external sw__scale;
+
+(**
+ * Scale all the coefficients of a by the scalar value.
+ *)
+procedure sws_scaleVec(a: PSwsVector; scalar: cdouble);
+  cdecl; external sw__scale;
+
+(**
+ * Scale all the coefficients of a so that their sum equals height.
+ *)
+procedure sws_normalizeVec(a: PSwsVector; height: cdouble);
+  cdecl; external sw__scale;
+
+procedure sws_convVec(a: PSwsVector; b: PSwsVector);
+  cdecl; external sw__scale;
+
+procedure sws_addVec(a: PSwsVector; b: PSwsVector);
+  cdecl; external sw__scale;
+
+procedure sws_subVec(a: PSwsVector; b: PSwsVector);
+  cdecl; external sw__scale;
+
+procedure sws_shiftVec(a: PSwsVector; shift: cint);
+  cdecl; external sw__scale;
+
+(**
+ * Allocate and return a clone of the vector a, that is a vector
+ * with the same coefficients as a.
+ *)
+function sws_cloneVec(a: PSwsVector): PSwsVector;
+  cdecl; external sw__scale;
+
+(**
+ * Print with av_log() a textual representation of the vector a
+ * if log_level <= av_log_level.
+ *)
+procedure sws_printVec2(a:         PSwsVector;
+                        log_ctx:   PAVClass; // PAVClass is declared in avcodec.pas
+                        log_level: cint);
+  cdecl; external sw__scale;
+
+procedure sws_freeVec(a: PSwsVector);
+  cdecl; external sw__scale;
+
+function sws_getDefaultFilter(lumaGBlur: cfloat; chromaGBlur: cfloat; 
+                              lumaSharpen: cfloat; chromaSharpen: cfloat;
+                              chromaHShift: cfloat; chromaVShift: cfloat;
+                              verbose: cint): PSwsFilter;
+  cdecl; external sw__scale;
+
+procedure sws_freeFilter(filter: PSwsFilter);
+  cdecl; external sw__scale;
+
+(**
+ * Check if context can be reused, otherwise reallocates a new one.
+ * 
+ * If context is NULL, just calls sws_getContext() to get a new
+ * context. Otherwise, checks if the parameters are the ones already
+ * saved in context. If that is the case, returns the current
+ * context. Otherwise, frees context and gets a new context with
+ * the new parameters.
+ * 
+ * Be warned that srcFilter and dstFilter are not checked, they
+ * are assumed to remain the same.
+ *)
+function sws_getCachedContext(context: PSwsContext;
+              srcW: cint; srcH: cint; srcFormat: TAVPixelFormat;
+              dstW: cint; dstH: cint; dstFormat: TAVPixelFormat;
+              flags: cint; srcFilter: PSwsFilter; 
+              dstFilter: PSwsFilter; param: PCdouble): PSwsContext;
+  cdecl; external sw__scale;
+
+(**
+ * Convert an 8bit paletted frame into a frame with a color depth of 32-bits.
+ *
+ * The output frame will have the same packed format as the palette.
+ *
+ * @param src        source frame buffer
+ * @param dst        destination frame buffer
+ * @param num_pixels number of pixels to convert
+ * @param palette    array with [256] entries, which must match color arrangement (RGB or BGR) of src
+ *)
+procedure sws_convertPalette8ToPacked32({const} src:     PPCuint8Array;
+                                        dst:             PPCuint8Array;
+                                        num_pixels:      cint;
+                                        {const} palette: PPCuint8Array);
+  cdecl; external sw__scale;
+
+(**
+ * Convert an 8bit paletted frame into a frame with a color depth of 24 bits.
+ *
+ * With the palette format "ABCD", the destination frame ends up with the format "ABC".
+ *
+ * @param src        source frame buffer
+ * @param dst        destination frame buffer
+ * @param num_pixels number of pixels to convert
+ * @param palette    array with [256] entries, which must match color arrangement (RGB or BGR) of src
+ *)
+procedure sws_convertPalette8ToPacked24({const} src:     PPCuint8Array;
+                                        dst:             PPCuint8Array;
+                                        num_pixels:      cint;
+                                        {const} palette: PPCuint8Array);
+  cdecl; external sw__scale;
+
+(**
+ * Get the AVClass for swsContext. It can be used in combination with
+ * AV_OPT_SEARCH_FAKE_OBJ for examining options.
+ *
+ * @see av_opt_find().
+ *)
+function sws_get_class(): {const} PAVClass;
+  cdecl; external sw__scale;
+
+implementation
+
+end.
diff --git a/src/lib/ffmpeg-1.1/swscale.pas b/src/lib/ffmpeg-1.1/swscale.pas
new file mode 100644
index 00000000..016b2536
--- /dev/null
+++ b/src/lib/ffmpeg-1.1/swscale.pas
@@ -0,0 +1,478 @@
+(*
+ * Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * FFmpeg 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 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * FFmpeg Pascal port
+ * - Ported by the UltraStar Deluxe Team
+ *
+ * Conversion of libswscale/swscale.h
+ * version: 2.1.103
+ *)
+ 
+unit swscale;
+
+{$IFDEF FPC}
+  {$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}
+  {$linklib libswscale}
+{$ENDIF}
+
+interface
+
+uses
+  ctypes,
+  avutil,
+  avcodec,
+  UConfig;
+
+const
+(*
+ * IMPORTANT: The official FFmpeg C headers change very quickly. Often some
+ * of the data structures are changed so that they become incompatible with
+ * older header files. The Pascal headers have to be adjusted to those changes,
+ * otherwise the application might crash randomly or strange bugs (not
+ * necessarily related to video or audio due to buffer overflows etc.) might
+ * occur.
+ *
+ * In the past users reported problems with USDX that took hours to fix and
+ * the problem was an unsupported version of FFmpeg. So we decided to disable
+ * support for future versions of FFmpeg until the headers are revised by us
+ * for that version as they otherwise most probably will break USDX.
+ *
+ * If the headers do not yet support your FFmpeg version you may want to
+ * adjust the max. version numbers manually but please note: it may work but
+ * in many cases it does not. The USDX team does NOT PROVIDE ANY SUPPORT
+ * for the game if the MAX. VERSION WAS CHANGED.
+ *
+ * The only safe way to support new versions of FFmpeg is to add the changes
+ * of the FFmpeg git repository C headers to the Pascal headers.
+ * You can accelerate this process by posting a patch with the git changes
+ * translated to Pascal to our bug tracker (please join our IRC chat before
+ * you start working on it). Simply adjusting the max. versions is NOT a valid
+ * fix. 
+ *)
+
+  (* Max. supported version by this header *)
+  LIBSWSCALE_MAX_VERSION_MAJOR   =  2;
+  LIBSWSCALE_MAX_VERSION_MINOR   =  1;
+  LIBSWSCALE_MAX_VERSION_RELEASE =  103;
+  LIBSWSCALE_MAX_VERSION = (LIBSWSCALE_MAX_VERSION_MAJOR * VERSION_MAJOR) +
+                           (LIBSWSCALE_MAX_VERSION_MINOR * VERSION_MINOR) +
+                           (LIBSWSCALE_MAX_VERSION_RELEASE * VERSION_RELEASE);
+
+(* Check if linked versions are supported *)
+{$IF (LIBSWSCALE_VERSION > LIBSWSCALE_MAX_VERSION)}
+  {$MESSAGE Error 'Linked version of libswscale is not yet supported!'}
+{$IFEND}
+
+type
+  TQuadCintArray = array[0..3] of cint;
+  PQuadCintArray = ^TQuadCintArray;
+  TCintArray = array[0..0] of cint;
+  PCintArray = ^TCintArray;
+  TPCuint8Array = array[0..0] of PCuint8;
+  PPCuint8Array = ^TPCuint8Array;
+
+(* libswscale/version.h start *)
+
+const
+(**
+ * FF_API_* defines may be placed below to indicate public API that will be
+ * dropped at a future version bump. The defines themselves are not part of
+ * the public API and may change, break or disappear at any time.
+ *)
+{$ifndef FF_API_SWS_GETCONTEXT}
+  FF_API_SWS_GETCONTEXT = LIBSWSCALE_VERSION_MAJOR < 3;    
+{$endif}
+{$ifndef FF_API_SWS_CPU_CAPS}
+  FF_API_SWS_CPU_CAPS = LIBSWSCALE_VERSION_MAJOR < 3;    
+{$endif}
+{$ifndef FF_API_SWS_FORMAT_NAME}
+  FF_API_SWS_FORMAT_NAME = LIBSWSCALE_VERSION_MAJOR < 3;    
+{$endif}
+
+(* libswscale/version.h end *)
+
+(**
+ * Return the LIBSWSCALE_VERSION_INT constant.
+ *)
+function swscale_version(): cuint;
+  cdecl; external sw__scale;
+
+(**
+ * Return the libswscale build-time configuration.
+ *)
+function swscale_configuration(): PAnsiChar;
+  cdecl; external sw__scale;
+
+(**
+ * Return the libswscale license.
+ *)
+function swscale_license(): PAnsiChar;
+  cdecl; external sw__scale;
+
+const
+  (* values for the flags, the stuff on the command line is different *)
+  SWS_FAST_BILINEAR =    1;
+  SWS_BILINEAR      =    2;
+  SWS_BICUBIC       =    4;
+  SWS_X             =    8;
+  SWS_POINT         =  $10;
+  SWS_AREA          =  $20;
+  SWS_BICUBLIN      =  $40;
+  SWS_GAUSS         =  $80;
+  SWS_SINC          = $100;
+  SWS_LANCZOS       = $200;
+  SWS_SPLINE        = $400;
+
+  SWS_SRC_V_CHR_DROP_MASK  = $30000;
+  SWS_SRC_V_CHR_DROP_SHIFT = 16;
+
+  SWS_PARAM_DEFAULT        = 123456;
+
+  SWS_PRINT_INFO           = $1000;
+
+  // the following 3 flags are not completely implemented
+  // internal chrominace subsampling info
+  SWS_FULL_CHR_H_INT    = $2000;
+  // input subsampling info
+  SWS_FULL_CHR_H_INP    = $4000;
+  SWS_DIRECT_BGR        = $8000;
+  SWS_ACCURATE_RND      = $40000;
+  SWS_BITEXACT          = $80000;
+
+{$IF FF_API_SWS_CPU_CAPS}
+(**
+ * CPU caps are autodetected now, those flags
+ * are only provided for API compatibility.
+ *)
+  SWS_CPU_CAPS_MMX      = $80000000;
+  SWS_CPU_CAPS_MMXEXT   = $20000000;
+  SWS_CPU_CAPS_MMX2     = $20000000;
+  SWS_CPU_CAPS_3DNOW    = $40000000;
+  SWS_CPU_CAPS_ALTIVEC  = $10000000;
+  SWS_CPU_CAPS_BFIN     = $01000000;
+  SWS_CPU_CAPS_SSE2     = $02000000;
+{$IFEND}
+
+  SWS_MAX_REDUCE_CUTOFF = 0.002;
+
+  SWS_CS_ITU709         = 1;
+  SWS_CS_FCC            = 4;
+  SWS_CS_ITU601         = 5;
+  SWS_CS_ITU624         = 5;
+  SWS_CS_SMPTE170M      = 5;
+  SWS_CS_SMPTE240M      = 7;
+  SWS_CS_DEFAULT        = 5;
+
+(**
+ * Return a pointer to yuv<->rgb coefficients for the given colorspace
+ * suitable for sws_setColorspaceDetails().
+ *
+ * @param colorspace One of the SWS_CS_* macros. If invalid,
+ * SWS_CS_DEFAULT is used.
+ *)
+function sws_getCoefficients(colorspace: cint): Pcint;
+  cdecl; external sw__scale;
+  
+type
+
+  // when used for filters they must have an odd number of elements
+  // coeffs cannot be shared between vectors
+  PSwsVector = ^TSwsVector;
+  TSwsVector = record
+    coeff: PCdouble;    // pointer to the list of coefficients
+    length: cint;       // number of coefficients in the vector
+  end;
+
+  // vectors can be shared
+  PSwsFilter = ^TSwsFilter;
+  TSwsFilter = record
+    lumH: PSwsVector;
+    lumV: PSwsVector;
+    chrH: PSwsVector;
+    chrV: PSwsVector;
+  end;
+
+  PSwsContext = ^TSwsContext;
+  TSwsContext = record
+    {internal structure}
+  end;
+
+(**
+ * Return a positive value if pix_fmt is a supported input format, 0
+ * otherwise.
+ *)
+function sws_isSupportedInput(pix_fmt: TAVPixelFormat): cint;
+  cdecl; external sw__scale;
+
+(**
+ * Return a positive value if pix_fmt is a supported output format, 0
+ * otherwise.
+ *)
+function sws_isSupportedOutput(pix_fmt: TAVPixelFormat): cint;
+  cdecl; external sw__scale;
+
+(**
+ * Allocate an empty SwsContext. This must be filled and passed to
+ * sws_init_context(). For filling see AVOptions, options.c and
+ * sws_setColorspaceDetails().
+ *)
+function sws_alloc_context(): PSwsContext;
+  cdecl; external sw__scale;
+
+(**
+ * Initialize the swscaler context sws_context.
+ *
+ * @return zero or positive value on success, a negative value on
+ * error
+ *)
+function sws_init_context(sws_context: PSwsContext; srcFilter: PSwsFilter; dstFilter: PSwsFilter): cint;
+  cdecl; external sw__scale;
+
+(**
+ * Free the swscaler context swsContext.
+ * If swsContext is NULL, then does nothing.
+ *)
+procedure sws_freeContext(swsContext: PSwsContext);
+  cdecl; external sw__scale;
+
+{$IF FF_API_SWS_GETCONTEXT}
+(**
+ * Allocate and return a SwsContext. You need it to perform
+ * scaling/conversion operations using sws_scale().
+ *
+ * @param srcW the width of the source image
+ * @param srcH the height of the source image
+ * @param srcFormat the source image format
+ * @param dstW the width of the destination image
+ * @param dstH the height of the destination image
+ * @param dstFormat the destination image format
+ * @param flags specify which algorithm and options to use for rescaling
+ * @return a pointer to an allocated context, or NULL in case of error
+ * @note this function is to be removed after a saner alternative is
+ *       written
+ * @deprecated Use sws_getCachedContext() instead.
+ *)
+function sws_getContext(srcW: cint; srcH: cint; srcFormat: TAVPixelFormat;
+                        dstW: cint; dstH: cint; dstFormat: TAVPixelFormat;
+                        flags: cint; srcFilter: PSwsFilter;
+                        dstFilter: PSwsFilter; param: PCdouble): PSwsContext;
+  cdecl; external sw__scale;
+{$IFEND}
+
+(**
+ * Scale the image slice in srcSlice and put the resulting scaled
+ * slice in the image in dst. A slice is a sequence of consecutive
+ * rows in an image.
+ *
+ * Slices have to be provided in sequential order, either in
+ * top-bottom or bottom-top order. If slices are provided in
+ * non-sequential order the behavior of the function is undefined.
+ *
+ * @param c         the scaling context previously created with
+ *                  sws_getContext()
+ * @param srcSlice  the array containing the pointers to the planes of
+ *                  the source slice
+ * @param srcStride the array containing the strides for each plane of
+ *                  the source image
+ * @param srcSliceY the position in the source image of the slice to
+ *                  process, that is the number (counted starting from
+ *                  zero) in the image of the first row of the slice
+ * @param srcSliceH the height of the source slice, that is the number
+ *                  of rows in the slice
+ * @param dst       the array containing the pointers to the planes of
+ *                  the destination image
+ * @param dstStride the array containing the strides for each plane of
+ *                  the destination image
+ * @return          the height of the output slice
+ *)
+function sws_scale(c: PSwsContext; {const} srcSlice: PPCuint8Array;
+              {const} srcStride: PCintArray; srcSliceY: cint; srcSliceH: cint; 
+              {const} dst: PPCuint8Array; {const} dstStride: PCintArray): cint;
+  cdecl; external sw__scale;
+
+(**
+ * @param dstRange flag indicating the while-black range of the output (1=jpeg / 0=mpeg)
+ * @param srcRange flag indicating the while-black range of the input (1=jpeg / 0=mpeg)
+ * @param table the yuv2rgb coefficients describing the output yuv space, normally ff_yuv2rgb_coeffs[x]
+ * @param inv_table the yuv2rgb coefficients describing the input yuv space, normally ff_yuv2rgb_coeffs[x]
+ * @param brightness 16.16 fixed point brightness correction
+ * @param contrast 16.16 fixed point contrast correction
+ * @param saturation 16.16 fixed point saturation correction
+ * @return -1 if not supported
+ *)
+function sws_setColorspaceDetails(c: PSwsContext; inv_table: PQuadCintArray; 
+              srcRange: cint; table: PQuadCintArray; dstRange: cint;
+              brightness: cint; contrast: cint; saturation: cint): cint;
+  cdecl; external sw__scale;
+
+(**
+ * @return -1 if not supported
+ *)
+function sws_getColorspaceDetails(c: PSwsContext; var inv_table: PQuadCintArray;
+              var srcRange: cint; var table: PQuadCintArray; var dstRange: cint;
+              var brightness: cint; var contrast: cint; var saturation: cint): cint;
+  cdecl; external sw__scale;
+
+(**
+ * Allocate and return an uninitialized vector with length coefficients.
+ *)
+function sws_allocVec(length: cint): PSwsVector;
+  cdecl; external sw__scale;
+
+(**
+ * Return a normalized Gaussian curve used to filter stuff
+ * quality = 3 is high quality, lower is lower quality.
+ *)
+function sws_getGaussianVec(variance: cdouble; quality: cdouble): PSwsVector;
+  cdecl; external sw__scale;
+
+(**
+ * Allocate and return a vector with length coefficients, all
+ * with the same value c.
+ *)
+function sws_getConstVec(c: cdouble; length: cint): PSwsVector;
+  cdecl; external sw__scale;
+  
+(**
+ * Allocate and return a vector with just one coefficient, with
+ * value 1.0.
+ *)
+function sws_getIdentityVec: PSwsVector;
+  cdecl; external sw__scale;
+
+(**
+ * Scale all the coefficients of a by the scalar value.
+ *)
+procedure sws_scaleVec(a: PSwsVector; scalar: cdouble);
+  cdecl; external sw__scale;
+
+(**
+ * Scale all the coefficients of a so that their sum equals height.
+ *)
+procedure sws_normalizeVec(a: PSwsVector; height: cdouble);
+  cdecl; external sw__scale;
+
+procedure sws_convVec(a: PSwsVector; b: PSwsVector);
+  cdecl; external sw__scale;
+
+procedure sws_addVec(a: PSwsVector; b: PSwsVector);
+  cdecl; external sw__scale;
+
+procedure sws_subVec(a: PSwsVector; b: PSwsVector);
+  cdecl; external sw__scale;
+
+procedure sws_shiftVec(a: PSwsVector; shift: cint);
+  cdecl; external sw__scale;
+
+(**
+ * Allocate and return a clone of the vector a, that is a vector
+ * with the same coefficients as a.
+ *)
+function sws_cloneVec(a: PSwsVector): PSwsVector;
+  cdecl; external sw__scale;
+
+(**
+ * Print with av_log() a textual representation of the vector a
+ * if log_level <= av_log_level.
+ *)
+procedure sws_printVec2(a:         PSwsVector;
+                        log_ctx:   PAVClass; // PAVClass is declared in avcodec.pas
+                        log_level: cint);
+  cdecl; external sw__scale;
+
+procedure sws_freeVec(a: PSwsVector);
+  cdecl; external sw__scale;
+
+function sws_getDefaultFilter(lumaGBlur: cfloat; chromaGBlur: cfloat; 
+                              lumaSharpen: cfloat; chromaSharpen: cfloat;
+                              chromaHShift: cfloat; chromaVShift: cfloat;
+                              verbose: cint): PSwsFilter;
+  cdecl; external sw__scale;
+
+procedure sws_freeFilter(filter: PSwsFilter);
+  cdecl; external sw__scale;
+
+(**
+ * Check if context can be reused, otherwise reallocates a new one.
+ * 
+ * If context is NULL, just calls sws_getContext() to get a new
+ * context. Otherwise, checks if the parameters are the ones already
+ * saved in context. If that is the case, returns the current
+ * context. Otherwise, frees context and gets a new context with
+ * the new parameters.
+ * 
+ * Be warned that srcFilter and dstFilter are not checked, they
+ * are assumed to remain the same.
+ *)
+function sws_getCachedContext(context: PSwsContext;
+              srcW: cint; srcH: cint; srcFormat: TAVPixelFormat;
+              dstW: cint; dstH: cint; dstFormat: TAVPixelFormat;
+              flags: cint; srcFilter: PSwsFilter; 
+              dstFilter: PSwsFilter; param: PCdouble): PSwsContext;
+  cdecl; external sw__scale;
+
+(**
+ * Convert an 8bit paletted frame into a frame with a color depth of 32-bits.
+ *
+ * The output frame will have the same packed format as the palette.
+ *
+ * @param src        source frame buffer
+ * @param dst        destination frame buffer
+ * @param num_pixels number of pixels to convert
+ * @param palette    array with [256] entries, which must match color arrangement (RGB or BGR) of src
+ *)
+procedure sws_convertPalette8ToPacked32({const} src:     PPCuint8Array;
+                                        dst:             PPCuint8Array;
+                                        num_pixels:      cint;
+                                        {const} palette: PPCuint8Array);
+  cdecl; external sw__scale;
+
+(**
+ * Convert an 8bit paletted frame into a frame with a color depth of 24 bits.
+ *
+ * With the palette format "ABCD", the destination frame ends up with the format "ABC".
+ *
+ * @param src        source frame buffer
+ * @param dst        destination frame buffer
+ * @param num_pixels number of pixels to convert
+ * @param palette    array with [256] entries, which must match color arrangement (RGB or BGR) of src
+ *)
+procedure sws_convertPalette8ToPacked24({const} src:     PPCuint8Array;
+                                        dst:             PPCuint8Array;
+                                        num_pixels:      cint;
+                                        {const} palette: PPCuint8Array);
+  cdecl; external sw__scale;
+
+(**
+ * Get the AVClass for swsContext. It can be used in combination with
+ * AV_OPT_SEARCH_FAKE_OBJ for examining options.
+ *
+ * @see av_opt_find().
+ *)
+function sws_get_class(): {const} PAVClass;
+  cdecl; external sw__scale;
+
+implementation
+
+end.