mirror of
https://github.com/FFmpeg/FFmpeg.git
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73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
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/*
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* Copyright (C) 2015 Pedro Arthur <bygrandao@gmail.com>
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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 "swscale_internal.h"
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typedef struct GammaContext
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{
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uint16_t *table;
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} GammaContext;
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// gamma_convert expects 16 bit rgb format
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// it writes directly in src slice thus it must be modifiable (done through cascade context)
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static int gamma_convert(SwsContext *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)
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{
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GammaContext *instance = desc->instance;
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uint16_t *table = instance->table;
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int srcW = desc->src->width;
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int i;
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for (i = 0; i < sliceH; ++i) {
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uint8_t ** src = desc->src->plane[0].line;
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int src_pos = sliceY+i - desc->src->plane[0].sliceY;
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uint16_t *src1 = (uint16_t*)*(src+src_pos);
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int j;
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for (j = 0; j < srcW; ++j) {
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uint16_t r = AV_RL16(src1 + j*4 + 0);
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uint16_t g = AV_RL16(src1 + j*4 + 1);
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uint16_t b = AV_RL16(src1 + j*4 + 2);
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AV_WL16(src1 + j*4 + 0, table[r]);
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AV_WL16(src1 + j*4 + 1, table[g]);
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AV_WL16(src1 + j*4 + 2, table[b]);
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}
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}
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return sliceH;
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}
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int ff_init_gamma_convert(SwsFilterDescriptor *desc, SwsSlice * src, uint16_t *table)
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{
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GammaContext *li = av_malloc(sizeof(GammaContext));
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if (!li)
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return AVERROR(ENOMEM);
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li->table = table;
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desc->instance = li;
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desc->src = src;
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desc->dst = NULL;
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desc->process = &gamma_convert;
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return 0;
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}
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