/*

 * DVD-Video subpicture CLUT (Color Lookup Table) utilities

 *

 * 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/bprint.h"

#include "libavutil/colorspace.h"

#include "libavutil/common.h"

#include "dvdclut.h"

#include "internal.h"

int ff_dvdclut_palette_extradata_cat(const uint32_t *clut,

                                     const size_t clut_size,

                                     AVCodecParameters *par)

{

    AVBPrint bp;

    if (clut_size != FF_DVDCLUT_CLUT_SIZE)

        return AVERROR(EINVAL);

    av_bprint_init(&bp, 0, FF_DVDCLUT_EXTRADATA_SIZE);

    av_bprintf(&bp, "palette: ");

    for (int i = 0; i < FF_DVDCLUT_CLUT_LEN; i++)

        av_bprintf(&bp, "%06"PRIx32"%s", clut[i],

                   i != (FF_DVDCLUT_CLUT_LEN - 1) ? ", " : "");

    av_bprintf(&bp, "\n");

    return ff_bprint_to_codecpar_extradata(par, &bp);

}

int ff_dvdclut_yuv_to_rgb(uint32_t *clut, const size_t clut_size)

{

    int y, cb, cr;

    uint8_t r, g, b;

    int r_add, g_add, b_add;

    if (clut_size != FF_DVDCLUT_CLUT_SIZE)

        return AVERROR(EINVAL);

    for (int i = 0; i < FF_DVDCLUT_CLUT_LEN; i++) {

        y  = (clut[i] >> 16) & 0xFF;

        cr = (clut[i] >> 8)  & 0xFF;

        cb = clut[i]         & 0xFF;

        YUV_TO_RGB1_CCIR(cb, cr);

        y = (y - 16) * FIX(255.0 / 219.0);

        r = av_clip_uint8((y + r_add - 1024) >> SCALEBITS);

        g = av_clip_uint8((y + g_add - 1024) >> SCALEBITS);

        b = av_clip_uint8((y + b_add - 1024) >> SCALEBITS);

        clut[i] = (r << 16) | (g << 8) | b;

    }

    return 0;

}