/*

  * Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>

  *
  * This file is part of FFmpeg.
  *

  * 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

  */

 #ifndef SWSCALE_SWSCALE_INTERNAL_H
 #define SWSCALE_SWSCALE_INTERNAL_H

 #include "config.h"
 

 #if HAVE_ALTIVEC_H

 #include <altivec.h>
 #endif
 

 #include "libavutil/avutil.h"

 #include "libavutil/log.h"

 #include "libavutil/pixfmt.h"

 #include "libavutil/pixdesc.h"

 #define STR(s) AV_TOSTRING(s) // AV_STRINGIFY is too long

 #define YUVRGB_TABLE_HEADROOM 128
 

 #define FAST_BGR2YV12 // use 7-bit instead of 15-bit coefficients

 #define MAX_FILTER_SIZE 256
 

 #define DITHER1XBPP
 

 #if HAVE_BIGENDIAN

 #define ALT32_CORR (-1)
 #else
 #define ALT32_CORR   1

 #endif
 

 #if ARCH_X86_64

 #   define APCK_PTR2  8

 #   define APCK_COEF 16
 #   define APCK_SIZE 24
 #else

 #   define APCK_PTR2  4
 #   define APCK_COEF  8

 #   define APCK_SIZE 16

 #endif
 

 struct SwsContext;
 

 typedef int (*SwsFunc)(struct SwsContext *context, const uint8_t *src[],

                        int srcStride[], int srcSliceY, int srcSliceH,

                        uint8_t *dst[], int dstStride[]);

 /**

  * Write one line of horizontally scaled data to planar output

  * without any additional vertical scaling (or point-scaling).
  *

  * @param src     scaled source data, 15bit for 8-10bit output,

  *                19-bit for 16bit output (in int32_t)

  * @param dest    pointer to the output plane. For >8bit

  *                output, this is in uint16_t

  * @param dstW    width of destination in pixels
  * @param dither  ordered dither array of type int16_t and size 8
  * @param offset  Dither offset

  */

 typedef void (*yuv2planar1_fn)(const int16_t *src, uint8_t *dest, int dstW,
                                const uint8_t *dither, int offset);

 /**

  * Write one line of horizontally scaled data to planar output

  * with multi-point vertical scaling between input pixels.
  *

  * @param filter        vertical luma/alpha scaling coefficients, 12bit [0,4096]
  * @param src           scaled luma (Y) or alpha (A) source data, 15bit for 8-10bit output,

  *                      19-bit for 16bit output (in int32_t)

  * @param filterSize    number of vertical input lines to scale
  * @param dest          pointer to output plane. For >8bit
  *                      output, this is in uint16_t
  * @param dstW          width of destination pixels
  * @param offset        Dither offset
  */

 typedef void (*yuv2planarX_fn)(const int16_t *filter, int filterSize,
                                const int16_t **src, uint8_t *dest, int dstW,
                                const uint8_t *dither, int offset);

 
 /**
  * Write one line of horizontally scaled chroma to interleaved output
  * with multi-point vertical scaling between input pixels.
  *
  * @param c             SWS scaling context

  * @param chrFilter     vertical chroma scaling coefficients, 12bit [0,4096]

  * @param chrUSrc       scaled chroma (U) source data, 15bit for 8-10bit output,
  *                      19-bit for 16bit output (in int32_t)
  * @param chrVSrc       scaled chroma (V) source data, 15bit for 8-10bit output,
  *                      19-bit for 16bit output (in int32_t)

  * @param chrFilterSize number of vertical chroma input lines to scale

  * @param dest          pointer to the output plane. For >8bit

  *                      output, this is in uint16_t

  * @param dstW          width of chroma planes

  */

 typedef void (*yuv2interleavedX_fn)(struct SwsContext *c,
                                     const int16_t *chrFilter,
                                     int chrFilterSize,
                                     const int16_t **chrUSrc,
                                     const int16_t **chrVSrc,
                                     uint8_t *dest, int dstW);

 /**
  * Write one line of horizontally scaled Y/U/V/A to packed-pixel YUV/RGB
  * output without any additional vertical scaling (or point-scaling). Note
  * that this function may do chroma scaling, see the "uvalpha" argument.
  *
  * @param c       SWS scaling context

  * @param lumSrc  scaled luma (Y) source data, 15bit for 8-10bit output,
  *                19-bit for 16bit output (in int32_t)
  * @param chrUSrc scaled chroma (U) source data, 15bit for 8-10bit output,
  *                19-bit for 16bit output (in int32_t)
  * @param chrVSrc scaled chroma (V) source data, 15bit for 8-10bit output,
  *                19-bit for 16bit output (in int32_t)
  * @param alpSrc  scaled alpha (A) source data, 15bit for 8-10bit output,
  *                19-bit for 16bit output (in int32_t)
  * @param dest    pointer to the output plane. For 16bit output, this is
  *                uint16_t

  * @param dstW    width of lumSrc and alpSrc in pixels, number of pixels
  *                to write into dest[]
  * @param uvalpha chroma scaling coefficient for the second line of chroma
  *                pixels, either 2048 or 0. If 0, one chroma input is used
  *                for 2 output pixels (or if the SWS_FLAG_FULL_CHR_INT flag
  *                is set, it generates 1 output pixel). If 2048, two chroma
  *                input pixels should be averaged for 2 output pixels (this
  *                only happens if SWS_FLAG_FULL_CHR_INT is not set)
  * @param y       vertical line number for this output. This does not need
  *                to be used to calculate the offset in the destination,
  *                but can be used to generate comfort noise using dithering
  *                for some output formats.
  */

 typedef void (*yuv2packed1_fn)(struct SwsContext *c, const int16_t *lumSrc,
                                const int16_t *chrUSrc[2],
                                const int16_t *chrVSrc[2],
                                const int16_t *alpSrc, uint8_t *dest,
                                int dstW, int uvalpha, int y);

 /**
  * Write one line of horizontally scaled Y/U/V/A to packed-pixel YUV/RGB
  * output by doing bilinear scaling between two input lines.
  *
  * @param c       SWS scaling context

  * @param lumSrc  scaled luma (Y) source data, 15bit for 8-10bit output,
  *                19-bit for 16bit output (in int32_t)
  * @param chrUSrc scaled chroma (U) source data, 15bit for 8-10bit output,
  *                19-bit for 16bit output (in int32_t)
  * @param chrVSrc scaled chroma (V) source data, 15bit for 8-10bit output,
  *                19-bit for 16bit output (in int32_t)
  * @param alpSrc  scaled alpha (A) source data, 15bit for 8-10bit output,
  *                19-bit for 16bit output (in int32_t)
  * @param dest    pointer to the output plane. For 16bit output, this is
  *                uint16_t

  * @param dstW    width of lumSrc and alpSrc in pixels, number of pixels
  *                to write into dest[]
  * @param yalpha  luma/alpha scaling coefficients for the second input line.
  *                The first line's coefficients can be calculated by using
  *                4096 - yalpha
  * @param uvalpha chroma scaling coefficient for the second input line. The
  *                first line's coefficients can be calculated by using
  *                4096 - uvalpha
  * @param y       vertical line number for this output. This does not need
  *                to be used to calculate the offset in the destination,
  *                but can be used to generate comfort noise using dithering
  *                for some output formats.
  */

 typedef void (*yuv2packed2_fn)(struct SwsContext *c, const int16_t *lumSrc[2],
                                const int16_t *chrUSrc[2],
                                const int16_t *chrVSrc[2],
                                const int16_t *alpSrc[2],
                                uint8_t *dest,
                                int dstW, int yalpha, int uvalpha, int y);

 /**
  * Write one line of horizontally scaled Y/U/V/A to packed-pixel YUV/RGB
  * output by doing multi-point vertical scaling between input pixels.
  *
  * @param c             SWS scaling context
  * @param lumFilter     vertical luma/alpha scaling coefficients, 12bit [0,4096]

  * @param lumSrc        scaled luma (Y) source data, 15bit for 8-10bit output,
  *                      19-bit for 16bit output (in int32_t)

  * @param lumFilterSize number of vertical luma/alpha input lines to scale
  * @param chrFilter     vertical chroma scaling coefficients, 12bit [0,4096]

  * @param chrUSrc       scaled chroma (U) source data, 15bit for 8-10bit output,
  *                      19-bit for 16bit output (in int32_t)
  * @param chrVSrc       scaled chroma (V) source data, 15bit for 8-10bit output,
  *                      19-bit for 16bit output (in int32_t)

  * @param chrFilterSize number of vertical chroma input lines to scale

  * @param alpSrc        scaled alpha (A) source data, 15bit for 8-10bit output,
  *                      19-bit for 16bit output (in int32_t)
  * @param dest          pointer to the output plane. For 16bit output, this is
  *                      uint16_t

  * @param dstW          width of lumSrc and alpSrc in pixels, number of pixels
  *                      to write into dest[]
  * @param y             vertical line number for this output. This does not need
  *                      to be used to calculate the offset in the destination,
  *                      but can be used to generate comfort noise using dithering
  *                      or some output formats.
  */

 typedef void (*yuv2packedX_fn)(struct SwsContext *c, const int16_t *lumFilter,
                                const int16_t **lumSrc, int lumFilterSize,
                                const int16_t *chrFilter,
                                const int16_t **chrUSrc,
                                const int16_t **chrVSrc, int chrFilterSize,
                                const int16_t **alpSrc, uint8_t *dest,
                                int dstW, int y);

 /* This struct should be aligned on at least a 32-byte boundary. */

 typedef struct SwsContext {

     /**
      * info on struct for av_log
      */

     const AVClass *av_class;

 
     /**

      * Note that src, dst, srcStride, dstStride will be copied in the
      * sws_scale() wrapper so they can be freely modified here.

      */
     SwsFunc swScale;

     int srcW;                     ///< Width  of source      luma/alpha planes.
     int srcH;                     ///< Height of source      luma/alpha planes.
     int dstH;                     ///< Height of destination luma/alpha planes.
     int chrSrcW;                  ///< Width  of source      chroma     planes.
     int chrSrcH;                  ///< Height of source      chroma     planes.
     int chrDstW;                  ///< Width  of destination chroma     planes.
     int chrDstH;                  ///< Height of destination chroma     planes.

     int lumXInc, chrXInc;
     int lumYInc, chrYInc;

     enum PixelFormat dstFormat;   ///< Destination pixel format.
     enum PixelFormat srcFormat;   ///< Source      pixel format.

     int dstFormatBpp;             ///< Number of bits per pixel of the destination pixel format.
     int srcFormatBpp;             ///< Number of bits per pixel of the source      pixel format.

     int dstBpc, srcBpc;

     int chrSrcHSubSample;         ///< Binary logarithm of horizontal subsampling factor between luma/alpha and chroma planes in source      image.
     int chrSrcVSubSample;         ///< Binary logarithm of vertical   subsampling factor between luma/alpha and chroma planes in source      image.
     int chrDstHSubSample;         ///< Binary logarithm of horizontal subsampling factor between luma/alpha and chroma planes in destination image.
     int chrDstVSubSample;         ///< Binary logarithm of vertical   subsampling factor between luma/alpha and chroma planes in destination image.
     int vChrDrop;                 ///< Binary logarithm of extra vertical subsampling factor in source image chroma planes specified by user.
     int sliceDir;                 ///< Direction that slices are fed to the scaler (1 = top-to-bottom, -1 = bottom-to-top).

     double param[2];              ///< Input parameters for scaling algorithms that need them.

     uint32_t pal_yuv[256];
     uint32_t pal_rgb[256];
 

     /**
      * @name Scaled horizontal lines ring buffer.
      * The horizontal scaler keeps just enough scaled lines in a ring buffer
      * so they may be passed to the vertical scaler. The pointers to the
      * allocated buffers for each line are duplicated in sequence in the ring
      * buffer to simplify indexing and avoid wrapping around between lines
      * inside the vertical scaler code. The wrapping is done before the
      * vertical scaler is called.
      */
     //@{
     int16_t **lumPixBuf;          ///< Ring buffer for scaled horizontal luma   plane lines to be fed to the vertical scaler.

     int16_t **chrUPixBuf;         ///< Ring buffer for scaled horizontal chroma plane lines to be fed to the vertical scaler.
     int16_t **chrVPixBuf;         ///< Ring buffer for scaled horizontal chroma plane lines to be fed to the vertical scaler.

     int16_t **alpPixBuf;          ///< Ring buffer for scaled horizontal alpha  plane lines to be fed to the vertical scaler.

     int vLumBufSize;              ///< Number of vertical luma/alpha lines allocated in the ring buffer.
     int vChrBufSize;              ///< Number of vertical chroma     lines allocated in the ring buffer.
     int lastInLumBuf;             ///< Last scaled horizontal luma/alpha line from source in the ring buffer.
     int lastInChrBuf;             ///< Last scaled horizontal chroma     line from source in the ring buffer.
     int lumBufIndex;              ///< Index in ring buffer of the last scaled horizontal luma/alpha line from source.
     int chrBufIndex;              ///< Index in ring buffer of the last scaled horizontal chroma     line from source.

     //@}

     uint8_t *formatConvBuffer;

     /**
      * @name Horizontal and vertical filters.
      * To better understand the following fields, here is a pseudo-code of
      * their usage in filtering a horizontal line:
      * @code
      * for (i = 0; i < width; i++) {
      *     dst[i] = 0;
      *     for (j = 0; j < filterSize; j++)
      *         dst[i] += src[ filterPos[i] + j ] * filter[ filterSize * i + j ];
      *     dst[i] >>= FRAC_BITS; // The actual implementation is fixed-point.
      * }
      * @endcode
      */
     //@{
     int16_t *hLumFilter;          ///< Array of horizontal filter coefficients for luma/alpha planes.
     int16_t *hChrFilter;          ///< Array of horizontal filter coefficients for chroma     planes.
     int16_t *vLumFilter;          ///< Array of vertical   filter coefficients for luma/alpha planes.
     int16_t *vChrFilter;          ///< Array of vertical   filter coefficients for chroma     planes.

     int32_t *hLumFilterPos;       ///< Array of horizontal filter starting positions for each dst[i] for luma/alpha planes.
     int32_t *hChrFilterPos;       ///< Array of horizontal filter starting positions for each dst[i] for chroma     planes.
     int32_t *vLumFilterPos;       ///< Array of vertical   filter starting positions for each dst[i] for luma/alpha planes.
     int32_t *vChrFilterPos;       ///< Array of vertical   filter starting positions for each dst[i] for chroma     planes.

     int hLumFilterSize;           ///< Horizontal filter size for luma/alpha pixels.
     int hChrFilterSize;           ///< Horizontal filter size for chroma     pixels.
     int vLumFilterSize;           ///< Vertical   filter size for luma/alpha pixels.
     int vChrFilterSize;           ///< Vertical   filter size for chroma     pixels.

     //@}

     int lumMmx2FilterCodeSize;    ///< Runtime-generated MMX2 horizontal fast bilinear scaler code size for luma/alpha planes.
     int chrMmx2FilterCodeSize;    ///< Runtime-generated MMX2 horizontal fast bilinear scaler code size for chroma     planes.
     uint8_t *lumMmx2FilterCode;   ///< Runtime-generated MMX2 horizontal fast bilinear scaler code for luma/alpha planes.
     uint8_t *chrMmx2FilterCode;   ///< Runtime-generated MMX2 horizontal fast bilinear scaler code for chroma     planes.

 
     int canMMX2BeUsed;
 

     int dstY;                     ///< Last destination vertical line output from last slice.
     int flags;                    ///< Flags passed by the user to select scaler algorithm, optimizations, subsampling, etc...

     void *yuvTable;             // pointer to the yuv->rgb table start so it can be freed()

     uint8_t *table_rV[256 + 2*YUVRGB_TABLE_HEADROOM];
     uint8_t *table_gU[256 + 2*YUVRGB_TABLE_HEADROOM];
     int table_gV[256 + 2*YUVRGB_TABLE_HEADROOM];
     uint8_t *table_bU[256 + 2*YUVRGB_TABLE_HEADROOM];

 
     //Colorspace stuff
     int contrast, brightness, saturation;    // for sws_getColorspaceDetails
     int srcColorspaceTable[4];
     int dstColorspaceTable[4];

     int srcRange;                 ///< 0 = MPG YUV range, 1 = JPG YUV range (source      image).
     int dstRange;                 ///< 0 = MPG YUV range, 1 = JPG YUV range (destination image).

     int src0Alpha;
     int dst0Alpha;

     int yuv2rgb_y_offset;
     int yuv2rgb_y_coeff;
     int yuv2rgb_v2r_coeff;
     int yuv2rgb_v2g_coeff;
     int yuv2rgb_u2g_coeff;
     int yuv2rgb_u2b_coeff;

 
 #define RED_DITHER            "0*8"
 #define GREEN_DITHER          "1*8"
 #define BLUE_DITHER           "2*8"
 #define Y_COEFF               "3*8"
 #define VR_COEFF              "4*8"
 #define UB_COEFF              "5*8"
 #define VG_COEFF              "6*8"
 #define UG_COEFF              "7*8"
 #define Y_OFFSET              "8*8"
 #define U_OFFSET              "9*8"
 #define V_OFFSET              "10*8"

 #define LUM_MMX_FILTER_OFFSET "11*8"
 #define CHR_MMX_FILTER_OFFSET "11*8+4*4*256"

 #define DSTW_OFFSET           "11*8+4*4*256*2" //do not change, it is hardcoded in the ASM

 #define ESP_OFFSET            "11*8+4*4*256*2+8"
 #define VROUNDER_OFFSET       "11*8+4*4*256*2+16"
 #define U_TEMP                "11*8+4*4*256*2+24"
 #define V_TEMP                "11*8+4*4*256*2+32"

 #define Y_TEMP                "11*8+4*4*256*2+40"

 #define ALP_MMX_FILTER_OFFSET "11*8+4*4*256*2+48"
 #define UV_OFF_PX             "11*8+4*4*256*3+48"
 #define UV_OFF_BYTE           "11*8+4*4*256*3+56"
 #define DITHER16              "11*8+4*4*256*3+64"
 #define DITHER32              "11*8+4*4*256*3+80"

     DECLARE_ALIGNED(8, uint64_t, redDither);
     DECLARE_ALIGNED(8, uint64_t, greenDither);
     DECLARE_ALIGNED(8, uint64_t, blueDither);
 
     DECLARE_ALIGNED(8, uint64_t, yCoeff);
     DECLARE_ALIGNED(8, uint64_t, vrCoeff);
     DECLARE_ALIGNED(8, uint64_t, ubCoeff);
     DECLARE_ALIGNED(8, uint64_t, vgCoeff);
     DECLARE_ALIGNED(8, uint64_t, ugCoeff);
     DECLARE_ALIGNED(8, uint64_t, yOffset);
     DECLARE_ALIGNED(8, uint64_t, uOffset);
     DECLARE_ALIGNED(8, uint64_t, vOffset);

     int32_t lumMmxFilter[4 * MAX_FILTER_SIZE];
     int32_t chrMmxFilter[4 * MAX_FILTER_SIZE];

     int dstW;                     ///< Width  of destination luma/alpha planes.

     DECLARE_ALIGNED(8, uint64_t, esp);
     DECLARE_ALIGNED(8, uint64_t, vRounder);
     DECLARE_ALIGNED(8, uint64_t, u_temp);
     DECLARE_ALIGNED(8, uint64_t, v_temp);
     DECLARE_ALIGNED(8, uint64_t, y_temp);

     int32_t alpMmxFilter[4 * MAX_FILTER_SIZE];

     // alignment of these values is not necessary, but merely here
     // to maintain the same offset across x8632 and x86-64. Once we
     // use proper offset macros in the asm, they can be removed.

     DECLARE_ALIGNED(8, ptrdiff_t, uv_off); ///< offset (in pixels) between u and v planes

     DECLARE_ALIGNED(8, ptrdiff_t, uv_offx2); ///< offset (in bytes) between u and v planes

     DECLARE_ALIGNED(8, uint16_t, dither16)[8];
     DECLARE_ALIGNED(8, uint32_t, dither32)[8];

     const uint8_t *chrDither8, *lumDither8;
 

 #if HAVE_ALTIVEC

     vector signed short   CY;
     vector signed short   CRV;
     vector signed short   CBU;
     vector signed short   CGU;
     vector signed short   CGV;
     vector signed short   OY;
     vector unsigned short CSHIFT;

     vector signed short  *vYCoeffsBank, *vCCoeffsBank;

 #endif
 

 #if ARCH_BFIN

     DECLARE_ALIGNED(4, uint32_t, oy);
     DECLARE_ALIGNED(4, uint32_t, oc);
     DECLARE_ALIGNED(4, uint32_t, zero);
     DECLARE_ALIGNED(4, uint32_t, cy);
     DECLARE_ALIGNED(4, uint32_t, crv);
     DECLARE_ALIGNED(4, uint32_t, rmask);
     DECLARE_ALIGNED(4, uint32_t, cbu);
     DECLARE_ALIGNED(4, uint32_t, bmask);
     DECLARE_ALIGNED(4, uint32_t, cgu);
     DECLARE_ALIGNED(4, uint32_t, cgv);
     DECLARE_ALIGNED(4, uint32_t, gmask);

 #endif
 

 #if HAVE_VIS

     DECLARE_ALIGNED(8, uint64_t, sparc_coeffs)[10];

 #endif

     int use_mmx_vfilter;

     /* function pointers for swScale() */

     yuv2planar1_fn yuv2plane1;
     yuv2planarX_fn yuv2planeX;
     yuv2interleavedX_fn yuv2nv12cX;

     yuv2packed1_fn yuv2packed1;
     yuv2packed2_fn yuv2packed2;
     yuv2packedX_fn yuv2packedX;

     /// Unscaled conversion of luma plane to YV12 for horizontal scaler.

     void (*lumToYV12)(uint8_t *dst, const uint8_t *src, const uint8_t *src2, const uint8_t *src3,

                       int width, uint32_t *pal);
     /// Unscaled conversion of alpha plane to YV12 for horizontal scaler.

     void (*alpToYV12)(uint8_t *dst, const uint8_t *src, const uint8_t *src2, const uint8_t *src3,

                       int width, uint32_t *pal);
     /// Unscaled conversion of chroma planes to YV12 for horizontal scaler.

     void (*chrToYV12)(uint8_t *dstU, uint8_t *dstV,

                       const uint8_t *src1, const uint8_t *src2, const uint8_t *src3,

                       int width, uint32_t *pal);

 
     /**

      * Functions to read planar input, such as planar RGB, and convert
      * internally to Y/UV.
      */

     /** @{ */
     void (*readLumPlanar)(uint8_t *dst, const uint8_t *src[4], int width);

     void (*readChrPlanar)(uint8_t *dstU, uint8_t *dstV, const uint8_t *src[4],
                           int width);

     /** @} */
 

     /**
      * Scale one horizontal line of input data using a bilinear filter
      * to produce one line of output data. Compared to SwsContext->hScale(),
      * please take note of the following caveats when using these:
      * - Scaling is done using only 7bit instead of 14bit coefficients.
      * - You can use no more than 5 input pixels to produce 4 output
      *   pixels. Therefore, this filter should not be used for downscaling
      *   by more than ~20% in width (because that equals more than 5/4th
      *   downscaling and thus more than 5 pixels input per 4 pixels output).
      * - In general, bilinear filters create artifacts during downscaling
      *   (even when <20%), because one output pixel will span more than one
      *   input pixel, and thus some pixels will need edges of both neighbor
      *   pixels to interpolate the output pixel. Since you can use at most
      *   two input pixels per output pixel in bilinear scaling, this is
      *   impossible and thus downscaling by any size will create artifacts.
      * To enable this type of scaling, set SWS_FLAG_FAST_BILINEAR
      * in SwsContext->flags.
      */
     /** @{ */

     void (*hyscale_fast)(struct SwsContext *c,

                          int16_t *dst, int dstWidth,

                          const uint8_t *src, int srcW, int xInc);
     void (*hcscale_fast)(struct SwsContext *c,

                          int16_t *dst1, int16_t *dst2, int dstWidth,

                          const uint8_t *src1, const uint8_t *src2,
                          int srcW, int xInc);

     /** @} */

     /**
      * Scale one horizontal line of input data using a filter over the input
      * lines, to produce one (differently sized) line of output data.
      *
      * @param dst        pointer to destination buffer for horizontally scaled

      *                   data. If the number of bits per component of one
      *                   destination pixel (SwsContext->dstBpc) is <= 10, data
      *                   will be 15bpc in 16bits (int16_t) width. Else (i.e.
      *                   SwsContext->dstBpc == 16), data will be 19bpc in
      *                   32bits (int32_t) width.

      * @param dstW       width of destination image

      * @param src        pointer to source data to be scaled. If the number of
      *                   bits per component of a source pixel (SwsContext->srcBpc)
      *                   is 8, this is 8bpc in 8bits (uint8_t) width. Else
      *                   (i.e. SwsContext->dstBpc > 8), this is native depth
      *                   in 16bits (uint16_t) width. In other words, for 9-bit
      *                   YUV input, this is 9bpc, for 10-bit YUV input, this is
      *                   10bpc, and for 16-bit RGB or YUV, this is 16bpc.

      * @param filter     filter coefficients to be used per output pixel for
      *                   scaling. This contains 14bpp filtering coefficients.
      *                   Guaranteed to contain dstW * filterSize entries.
      * @param filterPos  position of the first input pixel to be used for
      *                   each output pixel during scaling. Guaranteed to
      *                   contain dstW entries.
      * @param filterSize the number of input coefficients to be used (and
      *                   thus the number of input pixels to be used) for
      *                   creating a single output pixel. Is aligned to 4
      *                   (and input coefficients thus padded with zeroes)
      *                   to simplify creating SIMD code.
      */

     /** @{ */

     void (*hyScale)(struct SwsContext *c, int16_t *dst, int dstW,
                     const uint8_t *src, const int16_t *filter,

                     const int32_t *filterPos, int filterSize);

     void (*hcScale)(struct SwsContext *c, int16_t *dst, int dstW,
                     const uint8_t *src, const int16_t *filter,

                     const int32_t *filterPos, int filterSize);

     /** @} */

     /// Color range conversion function for luma plane if needed.
     void (*lumConvertRange)(int16_t *dst, int width);
     /// Color range conversion function for chroma planes if needed.
     void (*chrConvertRange)(int16_t *dst1, int16_t *dst2, int width);

     int needs_hcscale; ///< Set if there are chroma planes to be converted.

 } SwsContext;
 //FIXME check init (where 0)
 

 SwsFunc ff_yuv2rgb_get_func_ptr(SwsContext *c);

 int ff_yuv2rgb_c_init_tables(SwsContext *c, const int inv_table[4],
                              int fullRange, int brightness,
                              int contrast, int saturation);

 void ff_yuv2rgb_init_tables_altivec(SwsContext *c, const int inv_table[4],
                                     int brightness, int contrast, int saturation);

 void updateMMXDitherTables(SwsContext *c, int dstY, int lumBufIndex, int chrBufIndex,
                            int lastInLumBuf, int lastInChrBuf);
 

 SwsFunc ff_yuv2rgb_init_mmx(SwsContext *c);
 SwsFunc ff_yuv2rgb_init_vis(SwsContext *c);

 SwsFunc ff_yuv2rgb_init_altivec(SwsContext *c);

 SwsFunc ff_yuv2rgb_get_func_ptr_bfin(SwsContext *c);

 void ff_bfin_get_unscaled_swscale(SwsContext *c);

 #if FF_API_SWS_FORMAT_NAME
 /**
  * @deprecated Use av_get_pix_fmt_name() instead.
  */
 attribute_deprecated
 const char *sws_format_name(enum PixelFormat format);
 #endif
 

 #define is16BPS(x) \
     (av_pix_fmt_descriptors[x].comp[0].depth_minus1 == 15)

 #define is9_OR_10BPS(x) \
     (av_pix_fmt_descriptors[x].comp[0].depth_minus1 == 8 || \
      av_pix_fmt_descriptors[x].comp[0].depth_minus1 == 9)

 #define isNBPS(x) is9_OR_10BPS(x)
 

 #define isBE(x) \
     (av_pix_fmt_descriptors[x].flags & PIX_FMT_BE)
 
 #define isYUV(x) \
     (!(av_pix_fmt_descriptors[x].flags & PIX_FMT_RGB) && \
      av_pix_fmt_descriptors[x].nb_components >= 2)
 
 #define isPlanarYUV(x) \
     ((av_pix_fmt_descriptors[x].flags & PIX_FMT_PLANAR) && \
      isYUV(x))
 
 #define isRGB(x) \
     (av_pix_fmt_descriptors[x].flags & PIX_FMT_RGB)

 #if 0 // FIXME

 #define isGray(x) \
     (!(av_pix_fmt_descriptors[x].flags & PIX_FMT_PAL) && \
      av_pix_fmt_descriptors[x].nb_components <= 2)

 #else

 #define isGray(x)                      \
     ((x) == PIX_FMT_GRAY8       ||     \
      (x) == PIX_FMT_Y400A       ||     \
      (x) == PIX_FMT_GRAY16BE    ||     \
      (x) == PIX_FMT_GRAY16LE)

 #endif

 #define isRGBinInt(x) \
     (           \
         (x)==PIX_FMT_RGB48BE   ||   \
         (x)==PIX_FMT_RGB48LE   ||   \
         (x)==PIX_FMT_RGBA64BE  ||   \
         (x)==PIX_FMT_RGBA64LE  ||   \
         (x)==PIX_FMT_RGB32     ||   \
         (x)==PIX_FMT_RGB32_1   ||   \
         (x)==PIX_FMT_RGB24     ||   \
         (x)==PIX_FMT_RGB565BE  ||   \
         (x)==PIX_FMT_RGB565LE  ||   \
         (x)==PIX_FMT_RGB555BE  ||   \
         (x)==PIX_FMT_RGB555LE  ||   \
         (x)==PIX_FMT_RGB444BE  ||   \
         (x)==PIX_FMT_RGB444LE  ||   \
         (x)==PIX_FMT_RGB8      ||   \
         (x)==PIX_FMT_RGB4      ||   \
         (x)==PIX_FMT_RGB4_BYTE ||   \
         (x)==PIX_FMT_MONOBLACK ||   \
         (x)==PIX_FMT_MONOWHITE   \

     )

 #define isBGRinInt(x) \
     (           \
          (x)==PIX_FMT_BGR48BE  ||   \
          (x)==PIX_FMT_BGR48LE  ||   \
          (x)==PIX_FMT_BGRA64BE ||   \
          (x)==PIX_FMT_BGRA64LE ||   \
          (x)==PIX_FMT_BGR32    ||   \
          (x)==PIX_FMT_BGR32_1  ||   \
          (x)==PIX_FMT_BGR24    ||   \
          (x)==PIX_FMT_BGR565BE ||   \
          (x)==PIX_FMT_BGR565LE ||   \
          (x)==PIX_FMT_BGR555BE ||   \
          (x)==PIX_FMT_BGR555LE ||   \
          (x)==PIX_FMT_BGR444BE ||   \
          (x)==PIX_FMT_BGR444LE ||   \
          (x)==PIX_FMT_BGR8     ||   \
          (x)==PIX_FMT_BGR4     ||   \
          (x)==PIX_FMT_BGR4_BYTE||   \
          (x)==PIX_FMT_MONOBLACK||   \
          (x)==PIX_FMT_MONOWHITE   \

     )

 #define isRGBinBytes(x) (           \
            (x)==PIX_FMT_RGB48BE     \
         || (x)==PIX_FMT_RGB48LE     \

         || (x)==PIX_FMT_RGBA64BE    \
         || (x)==PIX_FMT_RGBA64LE    \

         || (x)==PIX_FMT_RGBA        \
         || (x)==PIX_FMT_ARGB        \
         || (x)==PIX_FMT_RGB24       \
     )
 #define isBGRinBytes(x) (           \

            (x)==PIX_FMT_BGR48BE     \
         || (x)==PIX_FMT_BGR48LE     \

         || (x)==PIX_FMT_BGRA64BE    \
         || (x)==PIX_FMT_BGRA64LE    \

         || (x)==PIX_FMT_BGRA        \

         || (x)==PIX_FMT_ABGR        \
         || (x)==PIX_FMT_BGR24       \
     )

 #define isAnyRGB(x) \
     (           \
           isRGBinInt(x)       ||    \
           isBGRinInt(x)       ||    \
           (x)==PIX_FMT_GBR24P     \

     )

 #define isALPHA(x)                                             \
     (av_pix_fmt_descriptors[x].nb_components == 2          ||  \

      av_pix_fmt_descriptors[x].nb_components == 4)
 

 #if 1

 #define isPacked(x)         (       \
            (x)==PIX_FMT_PAL8        \
         || (x)==PIX_FMT_YUYV422     \
         || (x)==PIX_FMT_UYVY422     \
         || (x)==PIX_FMT_Y400A       \

         ||  isRGBinInt(x)           \
         ||  isBGRinInt(x)           \

     )

 #else

 #define isPacked(x)                                            \
     ((av_pix_fmt_descriptors[x].nb_components >= 2         &&  \
       !(av_pix_fmt_descriptors[x].flags & PIX_FMT_PLANAR)) ||  \
      (x) == PIX_FMT_PAL8)

 #endif

 #define isPlanar(x)                                            \

     (av_pix_fmt_descriptors[x].nb_components >= 2          &&  \

      (av_pix_fmt_descriptors[x].flags & PIX_FMT_PLANAR))
 

 #define isPackedRGB(x)                                         \
     ((av_pix_fmt_descriptors[x].flags                        & \
      (PIX_FMT_PLANAR | PIX_FMT_RGB)) == PIX_FMT_RGB)
 
 #define isPlanarRGB(x)                                         \
     ((av_pix_fmt_descriptors[x].flags                        & \
      (PIX_FMT_PLANAR | PIX_FMT_RGB)) == (PIX_FMT_PLANAR | PIX_FMT_RGB))
 

 #define usePal(x) ((av_pix_fmt_descriptors[x].flags & PIX_FMT_PAL)       || \

                    (av_pix_fmt_descriptors[x].flags & PIX_FMT_PSEUDOPAL) || \
                    (x) == PIX_FMT_Y400A)

 extern const uint64_t ff_dither4[2];
 extern const uint64_t ff_dither8[2];

 extern const uint8_t dithers[8][8][8];

 extern const uint16_t dither_scale[15][16];

 extern const AVClass sws_context_class;
 

 /**

  * Set c->swScale to an unscaled converter if one exists for the specific

  * source and destination formats, bit depths, flags, etc.
  */
 void ff_get_unscaled_swscale(SwsContext *c);
 

 void ff_swscale_get_unscaled_altivec(SwsContext *c);
 

 /**

  * Return function pointer to fastest main scaler path function depending

  * on architecture and available optimizations.
  */
 SwsFunc ff_getSwsFunc(SwsContext *c);
 

 void ff_sws_init_input_funcs(SwsContext *c);

 void ff_sws_init_output_funcs(SwsContext *c,
                               yuv2planar1_fn *yuv2plane1,
                               yuv2planarX_fn *yuv2planeX,
                               yuv2interleavedX_fn *yuv2nv12cX,
                               yuv2packed1_fn *yuv2packed1,
                               yuv2packed2_fn *yuv2packed2,
                               yuv2packedX_fn *yuv2packedX);

 void ff_sws_init_swScale_altivec(SwsContext *c);

 void ff_sws_init_swScale_mmx(SwsContext *c);

 #endif /* SWSCALE_SWSCALE_INTERNAL_H */