1 /*
2 * Copyright (C) 2015 Pedro Arthur <bygrandao@gmail.com>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "swscale_internal.h"
22
23 typedef struct GammaContext
24 {
25 uint16_t *table;
26 } GammaContext;
27
28 // gamma_convert expects 16 bit rgb format
29 // it writes directly in src slice thus it must be modifiable (done through cascade context)
gamma_convert(SwsContext * c,SwsFilterDescriptor * desc,int sliceY,int sliceH)30 static int gamma_convert(SwsContext *c, SwsFilterDescriptor *desc, int sliceY, int sliceH)
31 {
32 GammaContext *instance = desc->instance;
33 uint16_t *table = instance->table;
34 int srcW = desc->src->width;
35
36 int i;
37 for (i = 0; i < sliceH; ++i) {
38 uint8_t ** src = desc->src->plane[0].line;
39 int src_pos = sliceY+i - desc->src->plane[0].sliceY;
40
41 uint16_t *src1 = (uint16_t*)*(src+src_pos);
42 int j;
43 for (j = 0; j < srcW; ++j) {
44 uint16_t r = AV_RL16(src1 + j*4 + 0);
45 uint16_t g = AV_RL16(src1 + j*4 + 1);
46 uint16_t b = AV_RL16(src1 + j*4 + 2);
47
48 AV_WL16(src1 + j*4 + 0, table[r]);
49 AV_WL16(src1 + j*4 + 1, table[g]);
50 AV_WL16(src1 + j*4 + 2, table[b]);
51 }
52
53 }
54 return sliceH;
55 }
56
57
ff_init_gamma_convert(SwsFilterDescriptor * desc,SwsSlice * src,uint16_t * table)58 int ff_init_gamma_convert(SwsFilterDescriptor *desc, SwsSlice * src, uint16_t *table)
59 {
60 GammaContext *li = av_malloc(sizeof(GammaContext));
61 if (!li)
62 return AVERROR(ENOMEM);
63 li->table = table;
64
65 desc->instance = li;
66 desc->src = src;
67 desc->dst = NULL;
68 desc->process = &gamma_convert;
69
70 return 0;
71 }
72
73