mirror of
https://github.com/FFmpeg/FFmpeg.git
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76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/*
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* DVD-Video subpicture CLUT (Color Lookup Table) utilities
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/bprint.h"
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#include "libavutil/colorspace.h"
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#include "libavutil/common.h"
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#include "dvdclut.h"
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#include "internal.h"
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int ff_dvdclut_palette_extradata_cat(const uint32_t *clut,
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const size_t clut_size,
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AVCodecParameters *par)
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{
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AVBPrint bp;
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if (clut_size != FF_DVDCLUT_CLUT_SIZE)
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return AVERROR(EINVAL);
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av_bprint_init(&bp, 0, FF_DVDCLUT_EXTRADATA_SIZE);
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av_bprintf(&bp, "palette: ");
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for (int i = 0; i < FF_DVDCLUT_CLUT_LEN; i++)
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av_bprintf(&bp, "%06"PRIx32"%s", clut[i],
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i != (FF_DVDCLUT_CLUT_LEN - 1) ? ", " : "");
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av_bprintf(&bp, "\n");
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return ff_bprint_to_codecpar_extradata(par, &bp);
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}
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int ff_dvdclut_yuv_to_rgb(uint32_t *clut, const size_t clut_size)
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{
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int y, cb, cr;
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uint8_t r, g, b;
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int r_add, g_add, b_add;
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if (clut_size != FF_DVDCLUT_CLUT_SIZE)
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return AVERROR(EINVAL);
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for (int i = 0; i < FF_DVDCLUT_CLUT_LEN; i++) {
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y = (clut[i] >> 16) & 0xFF;
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cr = (clut[i] >> 8) & 0xFF;
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cb = clut[i] & 0xFF;
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YUV_TO_RGB1_CCIR(cb, cr);
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y = (y - 16) * FIX(255.0 / 219.0);
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r = av_clip_uint8((y + r_add - 1024) >> SCALEBITS);
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g = av_clip_uint8((y + g_add - 1024) >> SCALEBITS);
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b = av_clip_uint8((y + b_add - 1024) >> SCALEBITS);
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clut[i] = (r << 16) | (g << 8) | b;
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}
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return 0;
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}
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