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Diffstat (limited to 'libswscale/gamma.c')
-rw-r--r-- | libswscale/gamma.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/libswscale/gamma.c b/libswscale/gamma.c new file mode 100644 index 0000000..d7470cb --- /dev/null +++ b/libswscale/gamma.c @@ -0,0 +1,72 @@ +/* + * Copyright (C) 2015 Pedro Arthur <bygrandao@gmail.com> + * + * 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 "swscale_internal.h" + +typedef struct GammaContext +{ + uint16_t *table; +} GammaContext; + +// gamma_convert expects 16 bit rgb format +// it writes directly in src slice thus it must be modifiable (done through cascade context) +static int gamma_convert(SwsContext *c, SwsFilterDescriptor *desc, int sliceY, int sliceH) +{ + GammaContext *instance = desc->instance; + uint16_t *table = instance->table; + int srcW = desc->src->width; + + int i; + for (i = 0; i < sliceH; ++i) { + uint8_t ** src = desc->src->plane[0].line; + int src_pos = sliceY+i - desc->src->plane[0].sliceY; + + uint16_t *src1 = (uint16_t*)*(src+src_pos); + int j; + for (j = 0; j < srcW; ++j) { + uint16_t r = AV_RL16(src1 + j*4 + 0); + uint16_t g = AV_RL16(src1 + j*4 + 1); + uint16_t b = AV_RL16(src1 + j*4 + 2); + + AV_WL16(src1 + j*4 + 0, table[r]); + AV_WL16(src1 + j*4 + 1, table[g]); + AV_WL16(src1 + j*4 + 2, table[b]); + } + + } + return sliceH; +} + + +int ff_init_gamma_convert(SwsFilterDescriptor *desc, SwsSlice * src, uint16_t *table) +{ + GammaContext *li = av_malloc(sizeof(GammaContext)); + if (!li) + return AVERROR(ENOMEM); + li->table = table; + + desc->instance = li; + desc->src = src; + desc->dst = NULL; + desc->process = &gamma_convert; + + return 0; +} + |