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/*
* 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;
}
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