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73 lines
2.2 KiB
73 lines
2.2 KiB
/* |
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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 "libavutil/mem.h" |
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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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