/*
 * 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 "libavutil/avutil.h"
#include "libavutil/pixfmt.h"
#include "libavutil/opt.h"
#include "swscale.h"
#include "swscale_internal.h"

static const char * sws_context_to_name(void * ptr)
{
    return "swscaler";
}

#define OFFSET(x) offsetof(SwsContext, x)
#define DEFAULT 0
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

static const AVOption options[] = {
    { "sws_flags", "scaler/cpu flags", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.dbl = DEFAULT }, 0, UINT_MAX, VE, "sws_flags" },
    { "fast_bilinear", "fast bilinear", 0, AV_OPT_TYPE_CONST, {.dbl = SWS_FAST_BILINEAR }, INT_MIN, INT_MAX, VE, "sws_flags" },
    { "bilinear", "bilinear", 0, AV_OPT_TYPE_CONST, {.dbl = SWS_BILINEAR }, INT_MIN, INT_MAX, VE, "sws_flags" },
    { "bicubic", "bicubic", 0, AV_OPT_TYPE_CONST, {.dbl = SWS_BICUBIC }, INT_MIN, INT_MAX, VE, "sws_flags" },
    { "experimental", "experimental", 0, AV_OPT_TYPE_CONST, {.dbl = SWS_X }, INT_MIN, INT_MAX, VE, "sws_flags" },
    { "neighbor", "nearest neighbor", 0, AV_OPT_TYPE_CONST, {.dbl = SWS_POINT }, INT_MIN, INT_MAX, VE, "sws_flags" },
    { "area", "averaging area", 0, AV_OPT_TYPE_CONST, {.dbl = SWS_AREA }, INT_MIN, INT_MAX, VE, "sws_flags" },
    { "bicublin", "luma bicubic, chroma bilinear", 0, AV_OPT_TYPE_CONST, {.dbl = SWS_BICUBLIN }, INT_MIN, INT_MAX, VE, "sws_flags" },
    { "gauss", "gaussian", 0, AV_OPT_TYPE_CONST, {.dbl = SWS_GAUSS }, INT_MIN, INT_MAX, VE, "sws_flags" },
    { "sinc", "sinc", 0, AV_OPT_TYPE_CONST, {.dbl = SWS_SINC }, INT_MIN, INT_MAX, VE, "sws_flags" },
    { "lanczos", "lanczos", 0, AV_OPT_TYPE_CONST, {.dbl = SWS_LANCZOS }, INT_MIN, INT_MAX, VE, "sws_flags" },
    { "spline", "natural bicubic spline", 0, AV_OPT_TYPE_CONST, {.dbl = SWS_SPLINE }, INT_MIN, INT_MAX, VE, "sws_flags" },
    { "print_info", "print info", 0, AV_OPT_TYPE_CONST, {.dbl = SWS_PRINT_INFO }, INT_MIN, INT_MAX, VE, "sws_flags" },
    { "accurate_rnd", "accurate rounding", 0, AV_OPT_TYPE_CONST, {.dbl = SWS_ACCURATE_RND }, INT_MIN, INT_MAX, VE, "sws_flags" },
    { "full_chroma_int", "full chroma interpolation", 0 , AV_OPT_TYPE_CONST, {.dbl = SWS_FULL_CHR_H_INT }, INT_MIN, INT_MAX, VE, "sws_flags" },
    { "full_chroma_inp", "full chroma input", 0 , AV_OPT_TYPE_CONST, {.dbl = SWS_FULL_CHR_H_INP }, INT_MIN, INT_MAX, VE, "sws_flags" },
    { "bitexact", "", 0 , AV_OPT_TYPE_CONST, {.dbl = SWS_BITEXACT }, INT_MIN, INT_MAX, VE, "sws_flags" },

    { "srcw", "source width"      , OFFSET(srcW), AV_OPT_TYPE_INT, {.dbl = 16 }, 1, INT_MAX, VE },
    { "srch", "source height"     , OFFSET(srcH), AV_OPT_TYPE_INT, {.dbl = 16 }, 1, INT_MAX, VE },
    { "dstw", "destination width" , OFFSET(dstW), AV_OPT_TYPE_INT, {.dbl = 16 }, 1, INT_MAX, VE },
    { "dsth", "destination height", OFFSET(dstH), AV_OPT_TYPE_INT, {.dbl = 16 }, 1, INT_MAX, VE },
    { "src_format", "source format"     , OFFSET(srcFormat), AV_OPT_TYPE_INT, {.dbl = DEFAULT }, 0, PIX_FMT_NB-1, VE },
    { "dst_format", "destination format", OFFSET(dstFormat), AV_OPT_TYPE_INT, {.dbl = DEFAULT }, 0, PIX_FMT_NB-1, VE },
    { "src_range" , "source range"      , OFFSET(srcRange) , AV_OPT_TYPE_INT, {.dbl = DEFAULT }, 0, 1, VE },
    { "dst_range" , "destination range" , OFFSET(dstRange) , AV_OPT_TYPE_INT, {.dbl = DEFAULT }, 0, 1, VE },
    { "param0" , "scaler param 0" , OFFSET(param[0]) , AV_OPT_TYPE_DOUBLE, {.dbl = SWS_PARAM_DEFAULT}, INT_MIN, INT_MAX, VE },
    { "param1" , "scaler param 1" , OFFSET(param[1]) , AV_OPT_TYPE_DOUBLE, {.dbl = SWS_PARAM_DEFAULT}, INT_MIN, INT_MAX, VE },

    { NULL }
};

const AVClass sws_context_class = { "SWScaler", sws_context_to_name, options };

const AVClass *sws_get_class(void)
{
    return &sws_context_class;
}