utils.c

/*
 * Copyright (C) 2001-2003 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
 */

#include "config.h"

#define _DEFAULT_SOURCE
#define _SVID_SOURCE // needed for MAP_ANONYMOUS
#define _DARWIN_C_SOURCE // needed for MAP_ANON
#include <inttypes.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
#if HAVE_MMAP
#include <sys/mman.h>
#if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
#define MAP_ANONYMOUS MAP_ANON
#endif
#endif
#if HAVE_VIRTUALALLOC
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif

#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/avutil.h"
#include "libavutil/bswap.h"
#include "libavutil/cpu.h"
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/libm.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/aarch64/cpu.h"
#include "libavutil/ppc/cpu.h"
#include "libavutil/x86/asm.h"
#include "libavutil/x86/cpu.h"

// We have to implement deprecated functions until they are removed, this is the
// simplest way to prevent warnings
#undef attribute_deprecated
#define attribute_deprecated

#include "rgb2rgb.h"
#include "swscale.h"
#include "swscale_internal.h"

#if !FF_API_SWS_VECTOR
static SwsVector *sws_getIdentityVec(void);
static void sws_addVec(SwsVector *a, SwsVector *b);
static void sws_shiftVec(SwsVector *a, int shift);
static void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level);
#endif

static void handle_formats(SwsContext *c);

unsigned swscale_version(void)
{
    av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);
    return LIBSWSCALE_VERSION_INT;
}

const char *swscale_configuration(void)
{
    return FFMPEG_CONFIGURATION;
}

const char *swscale_license(void)
{
#define LICENSE_PREFIX "libswscale license: "
    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
}

typedef struct FormatEntry {
    uint8_t is_supported_in         :1;
    uint8_t is_supported_out        :1;
    uint8_t is_supported_endianness :1;
} FormatEntry;

static const FormatEntry format_entries[AV_PIX_FMT_NB] = {
    [AV_PIX_FMT_YUV420P]     = { 1, 1 },
    [AV_PIX_FMT_YUYV422]     = { 1, 1 },
    [AV_PIX_FMT_RGB24]       = { 1, 1 },
    [AV_PIX_FMT_BGR24]       = { 1, 1 },
    [AV_PIX_FMT_YUV422P]     = { 1, 1 },
    [AV_PIX_FMT_YUV444P]     = { 1, 1 },
    [AV_PIX_FMT_YUV410P]     = { 1, 1 },
    [AV_PIX_FMT_YUV411P]     = { 1, 1 },
    [AV_PIX_FMT_GRAY8]       = { 1, 1 },
    [AV_PIX_FMT_MONOWHITE]   = { 1, 1 },
    [AV_PIX_FMT_MONOBLACK]   = { 1, 1 },
    [AV_PIX_FMT_PAL8]        = { 1, 0 },
    [AV_PIX_FMT_YUVJ420P]    = { 1, 1 },
    [AV_PIX_FMT_YUVJ411P]    = { 1, 1 },
    [AV_PIX_FMT_YUVJ422P]    = { 1, 1 },
    [AV_PIX_FMT_YUVJ444P]    = { 1, 1 },
    [AV_PIX_FMT_YVYU422]     = { 1, 1 },
    [AV_PIX_FMT_UYVY422]     = { 1, 1 },
    [AV_PIX_FMT_UYYVYY411]   = { 0, 0 },
    [AV_PIX_FMT_BGR8]        = { 1, 1 },
    [AV_PIX_FMT_BGR4]        = { 0, 1 },
    [AV_PIX_FMT_BGR4_BYTE]   = { 1, 1 },
    [AV_PIX_FMT_RGB8]        = { 1, 1 },
    [AV_PIX_FMT_RGB4]        = { 0, 1 },
    [AV_PIX_FMT_RGB4_BYTE]   = { 1, 1 },
    [AV_PIX_FMT_NV12]        = { 1, 1 },
    [AV_PIX_FMT_NV21]        = { 1, 1 },
    [AV_PIX_FMT_ARGB]        = { 1, 1 },
    [AV_PIX_FMT_RGBA]        = { 1, 1 },
    [AV_PIX_FMT_ABGR]        = { 1, 1 },
    [AV_PIX_FMT_BGRA]        = { 1, 1 },
    [AV_PIX_FMT_0RGB]        = { 1, 1 },
    [AV_PIX_FMT_RGB0]        = { 1, 1 },
    [AV_PIX_FMT_0BGR]        = { 1, 1 },
    [AV_PIX_FMT_BGR0]        = { 1, 1 },
    [AV_PIX_FMT_GRAY9BE]     = { 1, 1 },
    [AV_PIX_FMT_GRAY9LE]     = { 1, 1 },
    [AV_PIX_FMT_GRAY10BE]    = { 1, 1 },
    [AV_PIX_FMT_GRAY10LE]    = { 1, 1 },
    [AV_PIX_FMT_GRAY12BE]    = { 1, 1 },
    [AV_PIX_FMT_GRAY12LE]    = { 1, 1 },
    [AV_PIX_FMT_GRAY14BE]    = { 1, 1 },
    [AV_PIX_FMT_GRAY14LE]    = { 1, 1 },
    [AV_PIX_FMT_GRAY16BE]    = { 1, 1 },
    [AV_PIX_FMT_GRAY16LE]    = { 1, 1 },
    [AV_PIX_FMT_YUV440P]     = { 1, 1 },
    [AV_PIX_FMT_YUVJ440P]    = { 1, 1 },
    [AV_PIX_FMT_YUV440P10LE] = { 1, 1 },
    [AV_PIX_FMT_YUV440P10BE] = { 1, 1 },
    [AV_PIX_FMT_YUV440P12LE] = { 1, 1 },
    [AV_PIX_FMT_YUV440P12BE] = { 1, 1 },
    [AV_PIX_FMT_YUVA420P]    = { 1, 1 },
    [AV_PIX_FMT_YUVA422P]    = { 1, 1 },
    [AV_PIX_FMT_YUVA444P]    = { 1, 1 },
    [AV_PIX_FMT_YUVA420P9BE] = { 1, 1 },
    [AV_PIX_FMT_YUVA420P9LE] = { 1, 1 },
    [AV_PIX_FMT_YUVA422P9BE] = { 1, 1 },
    [AV_PIX_FMT_YUVA422P9LE] = { 1, 1 },
    [AV_PIX_FMT_YUVA444P9BE] = { 1, 1 },
    [AV_PIX_FMT_YUVA444P9LE] = { 1, 1 },
    [AV_PIX_FMT_YUVA420P10BE]= { 1, 1 },
    [AV_PIX_FMT_YUVA420P10LE]= { 1, 1 },
    [AV_PIX_FMT_YUVA422P10BE]= { 1, 1 },
    [AV_PIX_FMT_YUVA422P10LE]= { 1, 1 },
    [AV_PIX_FMT_YUVA444P10BE]= { 1, 1 },
    [AV_PIX_FMT_YUVA444P10LE]= { 1, 1 },
    [AV_PIX_FMT_YUVA420P16BE]= { 1, 1 },
    [AV_PIX_FMT_YUVA420P16LE]= { 1, 1 },
    [AV_PIX_FMT_YUVA422P16BE]= { 1, 1 },
    [AV_PIX_FMT_YUVA422P16LE]= { 1, 1 },
    [AV_PIX_FMT_YUVA444P16BE]= { 1, 1 },
    [AV_PIX_FMT_YUVA444P16LE]= { 1, 1 },
    [AV_PIX_FMT_RGB48BE]     = { 1, 1 },
    [AV_PIX_FMT_RGB48LE]     = { 1, 1 },
    [AV_PIX_FMT_RGBA64BE]    = { 1, 1, 1 },
    [AV_PIX_FMT_RGBA64LE]    = { 1, 1, 1 },
    [AV_PIX_FMT_RGB565BE]    = { 1, 1 },
    [AV_PIX_FMT_RGB565LE]    = { 1, 1 },
    [AV_PIX_FMT_RGB555BE]    = { 1, 1 },
    [AV_PIX_FMT_RGB555LE]    = { 1, 1 },
    [AV_PIX_FMT_BGR565BE]    = { 1, 1 },
    [AV_PIX_FMT_BGR565LE]    = { 1, 1 },
    [AV_PIX_FMT_BGR555BE]    = { 1, 1 },
    [AV_PIX_FMT_BGR555LE]    = { 1, 1 },
    [AV_PIX_FMT_YUV420P16LE] = { 1, 1 },
    [AV_PIX_FMT_YUV420P16BE] = { 1, 1 },
    [AV_PIX_FMT_YUV422P16LE] = { 1, 1 },
    [AV_PIX_FMT_YUV422P16BE] = { 1, 1 },
    [AV_PIX_FMT_YUV444P16LE] = { 1, 1 },
    [AV_PIX_FMT_YUV444P16BE] = { 1, 1 },
    [AV_PIX_FMT_RGB444LE]    = { 1, 1 },
    [AV_PIX_FMT_RGB444BE]    = { 1, 1 },
    [AV_PIX_FMT_BGR444LE]    = { 1, 1 },
    [AV_PIX_FMT_BGR444BE]    = { 1, 1 },
    [AV_PIX_FMT_YA8]         = { 1, 1 },
    [AV_PIX_FMT_YA16BE]      = { 1, 0 },
    [AV_PIX_FMT_YA16LE]      = { 1, 0 },
    [AV_PIX_FMT_BGR48BE]     = { 1, 1 },
    [AV_PIX_FMT_BGR48LE]     = { 1, 1 },
    [AV_PIX_FMT_BGRA64BE]    = { 1, 1, 1 },
    [AV_PIX_FMT_BGRA64LE]    = { 1, 1, 1 },
    [AV_PIX_FMT_YUV420P9BE]  = { 1, 1 },
    [AV_PIX_FMT_YUV420P9LE]  = { 1, 1 },
    [AV_PIX_FMT_YUV420P10BE] = { 1, 1 },
    [AV_PIX_FMT_YUV420P10LE] = { 1, 1 },
    [AV_PIX_FMT_YUV420P12BE] = { 1, 1 },
    [AV_PIX_FMT_YUV420P12LE] = { 1, 1 },
    [AV_PIX_FMT_YUV420P14BE] = { 1, 1 },
    [AV_PIX_FMT_YUV420P14LE] = { 1, 1 },
    [AV_PIX_FMT_YUV422P9BE]  = { 1, 1 },
    [AV_PIX_FMT_YUV422P9LE]  = { 1, 1 },
    [AV_PIX_FMT_YUV422P10BE] = { 1, 1 },
    [AV_PIX_FMT_YUV422P10LE] = { 1, 1 },
    [AV_PIX_FMT_YUV422P12BE] = { 1, 1 },
    [AV_PIX_FMT_YUV422P12LE] = { 1, 1 },
    [AV_PIX_FMT_YUV422P14BE] = { 1, 1 },
    [AV_PIX_FMT_YUV422P14LE] = { 1, 1 },
    [AV_PIX_FMT_YUV444P9BE]  = { 1, 1 },
    [AV_PIX_FMT_YUV444P9LE]  = { 1, 1 },
    [AV_PIX_FMT_YUV444P10BE] = { 1, 1 },
    [AV_PIX_FMT_YUV444P10LE] = { 1, 1 },
    [AV_PIX_FMT_YUV444P12BE] = { 1, 1 },
    [AV_PIX_FMT_YUV444P12LE] = { 1, 1 },
    [AV_PIX_FMT_YUV444P14BE] = { 1, 1 },
    [AV_PIX_FMT_YUV444P14LE] = { 1, 1 },
    [AV_PIX_FMT_GBRP]        = { 1, 1 },
    [AV_PIX_FMT_GBRP9LE]     = { 1, 1 },
    [AV_PIX_FMT_GBRP9BE]     = { 1, 1 },
    [AV_PIX_FMT_GBRP10LE]    = { 1, 1 },
    [AV_PIX_FMT_GBRP10BE]    = { 1, 1 },
    [AV_PIX_FMT_GBRAP10LE]   = { 1, 1 },
    [AV_PIX_FMT_GBRAP10BE]   = { 1, 1 },
    [AV_PIX_FMT_GBRP12LE]    = { 1, 1 },
    [AV_PIX_FMT_GBRP12BE]    = { 1, 1 },
    [AV_PIX_FMT_GBRAP12LE]   = { 1, 1 },
    [AV_PIX_FMT_GBRAP12BE]   = { 1, 1 },
    [AV_PIX_FMT_GBRP14LE]    = { 1, 1 },
    [AV_PIX_FMT_GBRP14BE]    = { 1, 1 },
    [AV_PIX_FMT_GBRP16LE]    = { 1, 1 },
    [AV_PIX_FMT_GBRP16BE]    = { 1, 1 },
    [AV_PIX_FMT_GBRAP]       = { 1, 1 },
    [AV_PIX_FMT_GBRAP16LE]   = { 1, 1 },
    [AV_PIX_FMT_GBRAP16BE]   = { 1, 1 },
    [AV_PIX_FMT_BAYER_BGGR8] = { 1, 0 },
    [AV_PIX_FMT_BAYER_RGGB8] = { 1, 0 },
    [AV_PIX_FMT_BAYER_GBRG8] = { 1, 0 },
    [AV_PIX_FMT_BAYER_GRBG8] = { 1, 0 },
    [AV_PIX_FMT_BAYER_BGGR16LE] = { 1, 0 },
    [AV_PIX_FMT_BAYER_BGGR16BE] = { 1, 0 },
    [AV_PIX_FMT_BAYER_RGGB16LE] = { 1, 0 },
    [AV_PIX_FMT_BAYER_RGGB16BE] = { 1, 0 },
    [AV_PIX_FMT_BAYER_GBRG16LE] = { 1, 0 },
    [AV_PIX_FMT_BAYER_GBRG16BE] = { 1, 0 },
    [AV_PIX_FMT_BAYER_GRBG16LE] = { 1, 0 },
    [AV_PIX_FMT_BAYER_GRBG16BE] = { 1, 0 },
    [AV_PIX_FMT_XYZ12BE]     = { 1, 1, 1 },
    [AV_PIX_FMT_XYZ12LE]     = { 1, 1, 1 },
    [AV_PIX_FMT_AYUV64LE]    = { 1, 1},
    [AV_PIX_FMT_P010LE]      = { 1, 1 },
    [AV_PIX_FMT_P010BE]      = { 1, 1 },
    [AV_PIX_FMT_P016LE]      = { 1, 1 },
    [AV_PIX_FMT_P016BE]      = { 1, 1 },
    [AV_PIX_FMT_GRAYF32LE]   = { 1, 1 },
    [AV_PIX_FMT_GRAYF32BE]   = { 1, 1 },
};

int sws_isSupportedInput(enum AVPixelFormat pix_fmt)
{
    return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
           format_entries[pix_fmt].is_supported_in : 0;
}

int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)
{
    return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
           format_entries[pix_fmt].is_supported_out : 0;
}

int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)
{
    return (unsigned)pix_fmt < AV_PIX_FMT_NB ?
           format_entries[pix_fmt].is_supported_endianness : 0;
}

static double getSplineCoeff(double a, double b, double c, double d,
                             double dist)
{
    if (dist <= 1.0)
        return ((d * dist + c) * dist + b) * dist + a;
    else
        return getSplineCoeff(0.0,
                               b + 2.0 * c + 3.0 * d,
                               c + 3.0 * d,
                              -b - 3.0 * c - 6.0 * d,
                              dist - 1.0);
}

static av_cold int get_local_pos(SwsContext *s, int chr_subsample, int pos, int dir)
{
    if (pos == -1 || pos <= -513) {
        pos = (128 << chr_subsample) - 128;
    }
    pos += 128; // relative to ideal left edge
    return pos >> chr_subsample;
}

typedef struct {
    int flag;                   ///< flag associated to the algorithm
    const char *description;    ///< human-readable description
    int size_factor;            ///< size factor used when initing the filters
} ScaleAlgorithm;

static const ScaleAlgorithm scale_algorithms[] = {
    { SWS_AREA,          "area averaging",                  1 /* downscale only, for upscale it is bilinear */ },
    { SWS_BICUBIC,       "bicubic",                         4 },
    { SWS_BICUBLIN,      "luma bicubic / chroma bilinear", -1 },
    { SWS_BILINEAR,      "bilinear",                        2 },
    { SWS_FAST_BILINEAR, "fast bilinear",                  -1 },
    { SWS_GAUSS,         "Gaussian",                        8 /* infinite ;) */ },
    { SWS_LANCZOS,       "Lanczos",                        -1 /* custom */ },
    { SWS_POINT,         "nearest neighbor / point",       -1 },
    { SWS_SINC,          "sinc",                           20 /* infinite ;) */ },
    { SWS_SPLINE,        "bicubic spline",                 20 /* infinite :)*/ },
    { SWS_X,             "experimental",                    8 },
};

static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,
                              int *outFilterSize, int xInc, int srcW,
                              int dstW, int filterAlign, int one,
                              int flags, int cpu_flags,
                              SwsVector *srcFilter, SwsVector *dstFilter,
                              double param[2], int srcPos, int dstPos)
{
    int i;
    int filterSize;
    int filter2Size;
    int minFilterSize;
    int64_t *filter    = NULL;
    int64_t *filter2   = NULL;
    const int64_t fone = 1LL << (54 - FFMIN(av_log2(srcW/dstW), 8));
    int ret            = -1;

    emms_c(); // FIXME should not be required but IS (even for non-MMX versions)

    // NOTE: the +3 is for the MMX(+1) / SSE(+3) scaler which reads over the end
    FF_ALLOC_ARRAY_OR_GOTO(NULL, *filterPos, (dstW + 3), sizeof(**filterPos), fail);

    if (FFABS(xInc - 0x10000) < 10 && srcPos == dstPos) { // unscaled
        int i;
        filterSize = 1;
        FF_ALLOCZ_ARRAY_OR_GOTO(NULL, filter,
                                dstW, sizeof(*filter) * filterSize, fail);

        for (i = 0; i < dstW; i++) {
            filter[i * filterSize] = fone;
            (*filterPos)[i]        = i;
        }
    } else if (flags & SWS_POINT) { // lame looking point sampling mode
        int i;
        int64_t xDstInSrc;
        filterSize = 1;
        FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,
                               dstW, sizeof(*filter) * filterSize, fail);

        xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);
        for (i = 0; i < dstW; i++) {
            int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;

            (*filterPos)[i] = xx;
            filter[i]       = fone;
            xDstInSrc      += xInc;
        }
    } else if ((xInc <= (1 << 16) && (flags & SWS_AREA)) ||
               (flags & SWS_FAST_BILINEAR)) { // bilinear upscale
        int i;
        int64_t xDstInSrc;
        filterSize = 2;
        FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,
                               dstW, sizeof(*filter) * filterSize, fail);

        xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);
        for (i = 0; i < dstW; i++) {
            int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;
            int j;

            (*filterPos)[i] = xx;
            // bilinear upscale / linear interpolate / area averaging
            for (j = 0; j < filterSize; j++) {
                int64_t coeff= fone - FFABS(((int64_t)xx<<16) - xDstInSrc)*(fone>>16);
                if (coeff < 0)
                    coeff = 0;
                filter[i * filterSize + j] = coeff;
                xx++;
            }
            xDstInSrc += xInc;
        }
    } else {
        int64_t xDstInSrc;
        int sizeFactor = -1;

        for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {
            if (flags & scale_algorithms[i].flag && scale_algorithms[i].size_factor > 0) {
                sizeFactor = scale_algorithms[i].size_factor;
                break;
            }
        }
        if (flags & SWS_LANCZOS)
            sizeFactor = param[0] != SWS_PARAM_DEFAULT ? ceil(2 * param[0]) : 6;
        av_assert0(sizeFactor > 0);

        if (xInc <= 1 << 16)
            filterSize = 1 + sizeFactor;    // upscale
        else
            filterSize = 1 + (sizeFactor * srcW + dstW - 1) / dstW;

        filterSize = FFMIN(filterSize, srcW - 2);
        filterSize = FFMAX(filterSize, 1);

        FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,
                               dstW, sizeof(*filter) * filterSize, fail);

        xDstInSrc = ((dstPos*(int64_t)xInc)>>7) - ((srcPos*0x10000LL)>>7);
        for (i = 0; i < dstW; i++) {
            int xx = (xDstInSrc - (filterSize - 2) * (1LL<<16)) / (1 << 17);
            int j;
            (*filterPos)[i] = xx;
            for (j = 0; j < filterSize; j++) {
                int64_t d = (FFABS(((int64_t)xx * (1 << 17)) - xDstInSrc)) << 13;
                double floatd;
                int64_t coeff;

                if (xInc > 1 << 16)
                    d = d * dstW / srcW;
                floatd = d * (1.0 / (1 << 30));

                if (flags & SWS_BICUBIC) {
                    int64_t B = (param[0] != SWS_PARAM_DEFAULT ? param[0] :   0) * (1 << 24);
                    int64_t C = (param[1] != SWS_PARAM_DEFAULT ? param[1] : 0.6) * (1 << 24);

                    if (d >= 1LL << 31) {
                        coeff = 0.0;
                    } else {
                        int64_t dd  = (d  * d) >> 30;
                        int64_t ddd = (dd * d) >> 30;

                        if (d < 1LL << 30)
                            coeff =  (12 * (1 << 24) -  9 * B - 6 * C) * ddd +
                                    (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +
                                      (6 * (1 << 24) -  2 * B)         * (1 << 30);
                        else
                            coeff =      (-B -  6 * C) * ddd +
                                      (6 * B + 30 * C) * dd  +
                                    (-12 * B - 48 * C) * d   +
                                      (8 * B + 24 * C) * (1 << 30);
                    }
                    coeff /= (1LL<<54)/fone;
                } else if (flags & SWS_X) {
                    double A = param[0] != SWS_PARAM_DEFAULT ? param[0] : 1.0;
                    double c;

                    if (floatd < 1.0)
                        c = cos(floatd * M_PI);
                    else
                        c = -1.0;
                    if (c < 0.0)
                        c = -pow(-c, A);
                    else
                        c = pow(c, A);
                    coeff = (c * 0.5 + 0.5) * fone;
                } else if (flags & SWS_AREA) {
                    int64_t d2 = d - (1 << 29);
                    if (d2 * xInc < -(1LL << (29 + 16)))
                        coeff = 1.0 * (1LL << (30 + 16));
                    else if (d2 * xInc < (1LL << (29 + 16)))
                        coeff = -d2 * xInc + (1LL << (29 + 16));
                    else
                        coeff = 0.0;
                    coeff *= fone >> (30 + 16);
                } else if (flags & SWS_GAUSS) {
                    double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
                    coeff = exp2(-p * floatd * floatd) * fone;
                } else if (flags & SWS_SINC) {
                    coeff = (d ? sin(floatd * M_PI) / (floatd * M_PI) : 1.0) * fone;
                } else if (flags & SWS_LANCZOS) {
                    double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
                    coeff = (d ? sin(floatd * M_PI) * sin(floatd * M_PI / p) /
                             (floatd * floatd * M_PI * M_PI / p) : 1.0) * fone;
                    if (floatd > p)
                        coeff = 0;
                } else if (flags & SWS_BILINEAR) {
                    coeff = (1 << 30) - d;
                    if (coeff < 0)
                        coeff = 0;
                    coeff *= fone >> 30;
                } else if (flags & SWS_SPLINE) {
                    double p = -2.196152422706632;
                    coeff = getSplineCoeff(1.0, 0.0, p, -p - 1.0, floatd) * fone;
                } else {
                    av_assert0(0);
                }

                filter[i * filterSize + j] = coeff;
                xx++;
            }
            xDstInSrc += 2 * xInc;
        }
    }

    /* apply src & dst Filter to filter -> filter2
     * av_free(filter);
     */
    av_assert0(filterSize > 0);
    filter2Size = filterSize;
    if (srcFilter)
        filter2Size += srcFilter->length - 1;
    if (dstFilter)
        filter2Size += dstFilter->length - 1;
    av_assert0(filter2Size > 0);
    FF_ALLOCZ_ARRAY_OR_GOTO(NULL, filter2, dstW, filter2Size * sizeof(*filter2), fail);

    for (i = 0; i < dstW; i++) {
        int j, k;

        if (srcFilter) {
            for (k = 0; k < srcFilter->length; k++) {
                for (j = 0; j < filterSize; j++)
                    filter2[i * filter2Size + k + j] +=
                        srcFilter->coeff[k] * filter[i * filterSize + j];
            }
        } else {
            for (j = 0; j < filterSize; j++)
                filter2[i * filter2Size + j] = filter[i * filterSize + j];
        }
        // FIXME dstFilter

        (*filterPos)[i] += (filterSize - 1) / 2 - (filter2Size - 1) / 2;
    }
    av_freep(&filter);

    /* try to reduce the filter-size (step1 find size and shift left) */
    // Assume it is near normalized (*0.5 or *2.0 is OK but * 0.001 is not).
    minFilterSize = 0;
    for (i = dstW - 1; i >= 0; i--) {
        int min = filter2Size;
        int j;
        int64_t cutOff = 0.0;

        /* get rid of near zero elements on the left by shifting left */
        for (j = 0; j < filter2Size; j++) {
            int k;
            cutOff += FFABS(filter2[i * filter2Size]);

            if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
                break;

            /* preserve monotonicity because the core can't handle the
             * filter otherwise */
            if (i < dstW - 1 && (*filterPos)[i] >= (*filterPos)[i + 1])
                break;

            // move filter coefficients left
            for (k = 1; k < filter2Size; k++)
                filter2[i * filter2Size + k - 1] = filter2[i * filter2Size + k];
            filter2[i * filter2Size + k - 1] = 0;
            (*filterPos)[i]++;
        }

        cutOff = 0;
        /* count near zeros on the right */
        for (j = filter2Size - 1; j > 0; j--) {
            cutOff += FFABS(filter2[i * filter2Size + j]);

            if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
                break;
            min--;
        }

        if (min > minFilterSize)
            minFilterSize = min;
    }

    if (PPC_ALTIVEC(cpu_flags)) {
        // we can handle the special case 4, so we don't want to go the full 8
        if (minFilterSize < 5)
            filterAlign = 4;

        /* We really don't want to waste our time doing useless computation, so
         * fall back on the scalar C code for very small filters.
         * Vectorizing is worth it only if you have a decent-sized vector. */
        if (minFilterSize < 3)
            filterAlign = 1;
    }

    if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) {
        // special case for unscaled vertical filtering
        if (minFilterSize == 1 && filterAlign == 2)
            filterAlign = 1;
    }

    av_assert0(minFilterSize > 0);
    filterSize = (minFilterSize + (filterAlign - 1)) & (~(filterAlign - 1));
    av_assert0(filterSize > 0);
    filter = av_malloc_array(dstW, filterSize * sizeof(*filter));
    if (!filter)
        goto fail;
    if (filterSize >= MAX_FILTER_SIZE * 16 /
                      ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16)) {
        ret = RETCODE_USE_CASCADE;
        goto fail;
    }
    *outFilterSize = filterSize;

    if (flags & SWS_PRINT_INFO)
        av_log(NULL, AV_LOG_VERBOSE,
               "SwScaler: reducing / aligning filtersize %d -> %d\n",
               filter2Size, filterSize);
    /* try to reduce the filter-size (step2 reduce it) */
    for (i = 0; i < dstW; i++) {
        int j;

        for (j = 0; j < filterSize; j++) {
            if (j >= filter2Size)
                filter[i * filterSize + j] = 0;
            else
                filter[i * filterSize + j] = filter2[i * filter2Size + j];
            if ((flags & SWS_BITEXACT) && j >= minFilterSize)
                filter[i * filterSize + j] = 0;
        }
    }

    // FIXME try to align filterPos if possible

    // fix borders
    for (i = 0; i < dstW; i++) {
        int j;
        if ((*filterPos)[i] < 0) {
            // move filter coefficients left to compensate for filterPos
            for (j = 1; j < filterSize; j++) {
                int left = FFMAX(j + (*filterPos)[i], 0);
                filter[i * filterSize + left] += filter[i * filterSize + j];
                filter[i * filterSize + j]     = 0;
            }
            (*filterPos)[i]= 0;
        }

        if ((*filterPos)[i] + filterSize > srcW) {
            int shift = (*filterPos)[i] + FFMIN(filterSize - srcW, 0);
            int64_t acc = 0;

            for (j = filterSize - 1; j >= 0; j--) {
                if ((*filterPos)[i] + j >= srcW) {
                    acc += filter[i * filterSize + j];
                    filter[i * filterSize + j] = 0;
                }
            }
            for (j = filterSize - 1; j >= 0; j--) {
                if (j < shift) {
                    filter[i * filterSize + j] = 0;
                } else {
                    filter[i * filterSize + j] = filter[i * filterSize + j - shift];
                }
            }

            (*filterPos)[i]-= shift;
            filter[i * filterSize + srcW - 1 - (*filterPos)[i]] += acc;
        }
        av_assert0((*filterPos)[i] >= 0);
        av_assert0((*filterPos)[i] < srcW);
        if ((*filterPos)[i] + filterSize > srcW) {
            for (j = 0; j < filterSize; j++) {
                av_assert0((*filterPos)[i] + j < srcW || !filter[i * filterSize + j]);
            }
        }
    }

    // Note the +1 is for the MMX scaler which reads over the end
    /* align at 16 for AltiVec (needed by hScale_altivec_real) */
    FF_ALLOCZ_ARRAY_OR_GOTO(NULL, *outFilter,
                            (dstW + 3), *outFilterSize * sizeof(int16_t), fail);

    /* normalize & store in outFilter */
    for (i = 0; i < dstW; i++) {
        int j;
        int64_t error = 0;
        int64_t sum   = 0;

        for (j = 0; j < filterSize; j++) {
            sum += filter[i * filterSize + j];
        }
        sum = (sum + one / 2) / one;
        if (!sum) {
            av_log(NULL, AV_LOG_WARNING, "SwScaler: zero vector in scaling\n");
            sum = 1;
        }
        for (j = 0; j < *outFilterSize; j++) {
            int64_t v = filter[i * filterSize + j] + error;
            int intV  = ROUNDED_DIV(v, sum);
            (*outFilter)[i * (*outFilterSize) + j] = intV;
            error                                  = v - intV * sum;
        }
    }

    (*filterPos)[dstW + 0] =
    (*filterPos)[dstW + 1] =
    (*filterPos)[dstW + 2] = (*filterPos)[dstW - 1]; /* the MMX/SSE scaler will
                                                      * read over the end */
    for (i = 0; i < *outFilterSize; i++) {
        int k = (dstW - 1) * (*outFilterSize) + i;
        (*outFilter)[k + 1 * (*outFilterSize)] =
        (*outFilter)[k + 2 * (*outFilterSize)] =
        (*outFilter)[k + 3 * (*outFilterSize)] = (*outFilter)[k];
    }

    ret = 0;

fail:
    if(ret < 0)
        av_log(NULL, ret == RETCODE_USE_CASCADE ? AV_LOG_DEBUG : AV_LOG_ERROR, "sws: initFilter failed\n");
    av_free(filter);
    av_free(filter2);
    return ret;
}

static void fill_rgb2yuv_table(SwsContext *c, const int table[4], int dstRange)
{
    int64_t W, V, Z, Cy, Cu, Cv;
    int64_t vr =  table[0];
    int64_t ub =  table[1];
    int64_t ug = -table[2];
    int64_t vg = -table[3];
    int64_t ONE = 65536;
    int64_t cy = ONE;
    uint8_t *p = (uint8_t*)c->input_rgb2yuv_table;
    int i;
    static const int8_t map[] = {
    BY_IDX, GY_IDX, -1    , BY_IDX, BY_IDX, GY_IDX, -1    , BY_IDX,
    RY_IDX, -1    , GY_IDX, RY_IDX, RY_IDX, -1    , GY_IDX, RY_IDX,
    RY_IDX, GY_IDX, -1    , RY_IDX, RY_IDX, GY_IDX, -1    , RY_IDX,
    BY_IDX, -1    , GY_IDX, BY_IDX, BY_IDX, -1    , GY_IDX, BY_IDX,
    BU_IDX, GU_IDX, -1    , BU_IDX, BU_IDX, GU_IDX, -1    , BU_IDX,
    RU_IDX, -1    , GU_IDX, RU_IDX, RU_IDX, -1    , GU_IDX, RU_IDX,
    RU_IDX, GU_IDX, -1    , RU_IDX, RU_IDX, GU_IDX, -1    , RU_IDX,
    BU_IDX, -1    , GU_IDX, BU_IDX, BU_IDX, -1    , GU_IDX, BU_IDX,
    BV_IDX, GV_IDX, -1    , BV_IDX, BV_IDX, GV_IDX, -1    , BV_IDX,
    RV_IDX, -1    , GV_IDX, RV_IDX, RV_IDX, -1    , GV_IDX, RV_IDX,
    RV_IDX, GV_IDX, -1    , RV_IDX, RV_IDX, GV_IDX, -1    , RV_IDX,
    BV_IDX, -1    , GV_IDX, BV_IDX, BV_IDX, -1    , GV_IDX, BV_IDX,
    RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,
    BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,
    GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    ,
    -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX,
    RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,
    BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,
    GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    ,
    -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX,
    RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,
    BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,
    GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    ,
    -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, //23
    -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //24
    -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //25
    -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //26
    -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //27
    -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //28
    -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //29
    -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //30
    -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //31
    BY_IDX, GY_IDX, RY_IDX, -1    , -1    , -1    , -1    , -1    , //32
    BU_IDX, GU_IDX, RU_IDX, -1    , -1    , -1    , -1    , -1    , //33
    BV_IDX, GV_IDX, RV_IDX, -1    , -1    , -1    , -1    , -1    , //34
    };

    dstRange = 0; //FIXME range = 1 is handled elsewhere

    if (!dstRange) {
        cy = cy * 255 / 219;
    } else {
        vr = vr * 224 / 255;
        ub = ub * 224 / 255;
        ug = ug * 224 / 255;
        vg = vg * 224 / 255;
    }
    W = ROUNDED_DIV(ONE*ONE*ug, ub);
    V = ROUNDED_DIV(ONE*ONE*vg, vr);
    Z = ONE*ONE-W-V;

    Cy = ROUNDED_DIV(cy*Z, ONE);
    Cu = ROUNDED_DIV(ub*Z, ONE);
    Cv = ROUNDED_DIV(vr*Z, ONE);

    c->input_rgb2yuv_table[RY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V        , Cy);
    c->input_rgb2yuv_table[GY_IDX] =  ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE  , Cy);
    c->input_rgb2yuv_table[BY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W        , Cy);

    c->input_rgb2yuv_table[RU_IDX] =  ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V        , Cu);
    c->input_rgb2yuv_table[GU_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE  , Cu);
    c->input_rgb2yuv_table[BU_IDX] =  ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(Z+W)    , Cu);

    c->input_rgb2yuv_table[RV_IDX] =  ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(V+Z)    , Cv);
    c->input_rgb2yuv_table[GV_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE  , Cv);
    c->input_rgb2yuv_table[BV_IDX] =  ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W        , Cv);

    if(/*!dstRange && */!memcmp(table, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], sizeof(ff_yuv2rgb_coeffs[SWS_CS_DEFAULT]))) {
        c->input_rgb2yuv_table[BY_IDX] =  ((int)(0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
        c->input_rgb2yuv_table[BV_IDX] = (-(int)(0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
        c->input_rgb2yuv_table[BU_IDX] =  ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
        c->input_rgb2yuv_table[GY_IDX] =  ((int)(0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
        c->input_rgb2yuv_table[GV_IDX] = (-(int)(0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
        c->input_rgb2yuv_table[GU_IDX] = (-(int)(0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
        c->input_rgb2yuv_table[RY_IDX] =  ((int)(0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
        c->input_rgb2yuv_table[RV_IDX] =  ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
        c->input_rgb2yuv_table[RU_IDX] = (-(int)(0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));
    }
    for(i=0; i<FF_ARRAY_ELEMS(map); i++)
        AV_WL16(p + 16*4 + 2*i, map[i] >= 0 ? c->input_rgb2yuv_table[map[i]] : 0);
}

static void fill_xyztables(struct SwsContext *c)
{
    int i;
    double xyzgamma = XYZ_GAMMA;
    double rgbgamma = 1.0 / RGB_GAMMA;
    double xyzgammainv = 1.0 / XYZ_GAMMA;
    double rgbgammainv = RGB_GAMMA;
    static const int16_t xyz2rgb_matrix[3][4] = {
        {13270, -6295, -2041},
        {-3969,  7682,   170},
        {  228,  -835,  4329} };
    static const int16_t rgb2xyz_matrix[3][4] = {
        {1689, 1464,  739},
        { 871, 2929,  296},
        {  79,  488, 3891} };
    static int16_t xyzgamma_tab[4096], rgbgamma_tab[4096], xyzgammainv_tab[4096], rgbgammainv_tab[4096];

    memcpy(c->xyz2rgb_matrix, xyz2rgb_matrix, sizeof(c->xyz2rgb_matrix));
    memcpy(c->rgb2xyz_matrix, rgb2xyz_matrix, sizeof(c->rgb2xyz_matrix));
    c->xyzgamma = xyzgamma_tab;
    c->rgbgamma = rgbgamma_tab;
    c->xyzgammainv = xyzgammainv_tab;
    c->rgbgammainv = rgbgammainv_tab;

    if (rgbgamma_tab[4095])
        return;

    /* set gamma vectors */
    for (i = 0; i < 4096; i++) {
        xyzgamma_tab[i] = lrint(pow(i / 4095.0, xyzgamma) * 4095.0);
        rgbgamma_tab[i] = lrint(pow(i / 4095.0, rgbgamma) * 4095.0);
        xyzgammainv_tab[i] = lrint(pow(i / 4095.0, xyzgammainv) * 4095.0);
        rgbgammainv_tab[i] = lrint(pow(i / 4095.0, rgbgammainv) * 4095.0);
    }
}

int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
                             int srcRange, const int table[4], int dstRange,
                             int brightness, int contrast, int saturation)
{
    const AVPixFmtDescriptor *desc_dst;
    const AVPixFmtDescriptor *desc_src;
    int need_reinit = 0;

    handle_formats(c);
    desc_dst = av_pix_fmt_desc_get(c->dstFormat);
    desc_src = av_pix_fmt_desc_get(c->srcFormat);

    if(!isYUV(c->dstFormat) && !isGray(c->dstFormat))
        dstRange = 0;
    if(!isYUV(c->srcFormat) && !isGray(c->srcFormat))
        srcRange = 0;

    if (c->srcRange != srcRange ||
        c->dstRange != dstRange ||
        c->brightness != brightness ||
        c->contrast   != contrast ||
        c->saturation != saturation ||
        memcmp(c->srcColorspaceTable, inv_table, sizeof(int) * 4) ||
        memcmp(c->dstColorspaceTable,     table, sizeof(int) * 4)
    )
        need_reinit = 1;

    memmove(c->srcColorspaceTable, inv_table, sizeof(int) * 4);
    memmove(c->dstColorspaceTable, table, sizeof(int) * 4);



    c->brightness = brightness;
    c->contrast   = contrast;
    c->saturation = saturation;
    c->srcRange   = srcRange;
    c->dstRange   = dstRange;

    //The srcBpc check is possibly wrong but we seem to lack a definitive reference to test this
    //and what we have in ticket 2939 looks better with this check
    if (need_reinit && (c->srcBpc == 8 || !isYUV(c->srcFormat)))
        ff_sws_init_range_convert(c);

    c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
    c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

    if (c->cascaded_context[c->cascaded_mainindex])
        return sws_setColorspaceDetails(c->cascaded_context[c->cascaded_mainindex],inv_table, srcRange,table, dstRange, brightness,  contrast, saturation);

    if (!need_reinit)
        return 0;

    if ((isYUV(c->dstFormat) || isGray(c->dstFormat)) && (isYUV(c->srcFormat) || isGray(c->srcFormat))) {
        if (!c->cascaded_context[0] &&
            memcmp(c->dstColorspaceTable, c->srcColorspaceTable, sizeof(int) * 4) &&
            c->srcW && c->srcH && c->dstW && c->dstH) {
            enum AVPixelFormat tmp_format;
            int tmp_width, tmp_height;
            int srcW = c->srcW;
            int srcH = c->srcH;
            int dstW = c->dstW;
            int dstH = c->dstH;
            int ret;
            av_log(c, AV_LOG_VERBOSE, "YUV color matrix differs for YUV->YUV, using intermediate RGB to convert\n");

            if (isNBPS(c->dstFormat) || is16BPS(c->dstFormat)) {
                if (isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) {
                    tmp_format = AV_PIX_FMT_BGRA64;
                } else {
                    tmp_format = AV_PIX_FMT_BGR48;
                }
            } else {
                if (isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) {
                    tmp_format = AV_PIX_FMT_BGRA;
                } else {
                    tmp_format = AV_PIX_FMT_BGR24;
                }
            }

            if (srcW*srcH > dstW*dstH) {
                tmp_width  = dstW;
                tmp_height = dstH;
            } else {
                tmp_width  = srcW;
                tmp_height = srcH;
            }

            ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
                                tmp_width, tmp_height, tmp_format, 64);
            if (ret < 0)
                return ret;

            c->cascaded_context[0] = sws_alloc_set_opts(srcW, srcH, c->srcFormat,
                                                        tmp_width, tmp_height, tmp_format,
                                                        c->flags, c->param);
            if (!c->cascaded_context[0])
                return -1;

            c->cascaded_context[0]->alphablend = c->alphablend;
            ret = sws_init_context(c->cascaded_context[0], NULL , NULL);
            if (ret < 0)
                return ret;
            //we set both src and dst depending on that the RGB side will be ignored
            sws_setColorspaceDetails(c->cascaded_context[0], inv_table,
                                     srcRange, table, dstRange,
                                     brightness, contrast, saturation);

            c->cascaded_context[1] = sws_getContext(tmp_width, tmp_height, tmp_format,
                                                    dstW, dstH, c->dstFormat,
                                                    c->flags, NULL, NULL, c->param);
            if (!c->cascaded_context[1])
                return -1;
            sws_setColorspaceDetails(c->cascaded_context[1], inv_table,
                                     srcRange, table, dstRange,
                                     0, 1 << 16, 1 << 16);
            return 0;
        }
        return -1;
    }

    if (!isYUV(c->dstFormat) && !isGray(c->dstFormat)) {
        ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness,
                                 contrast, saturation);
        // FIXME factorize

        if (ARCH_PPC)
            ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,
                                       contrast, saturation);
    }

    fill_rgb2yuv_table(c, table, dstRange);

    return 0;
}

int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
                             int *srcRange, int **table, int *dstRange,
                             int *brightness, int *contrast, int *saturation)
{
    if (!c )
        return -1;

    *inv_table  = c->srcColorspaceTable;
    *table      = c->dstColorspaceTable;
    *srcRange   = c->srcRange;
    *dstRange   = c->dstRange;
    *brightness = c->brightness;
    *contrast   = c->contrast;
    *saturation = c->saturation;