1 /*
2 * Copyright (c) 2015-2016 Kieran Kunhya <kieran@kunhya.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 "libavutil/attributes.h"
22 #include "libavutil/common.h"
23
24 #include "cfhdencdsp.h"
25
filter(int16_t *input, ptrdiff_t in_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len)26 static av_always_inline void filter(int16_t *input, ptrdiff_t in_stride,
27 int16_t *low, ptrdiff_t low_stride,
28 int16_t *high, ptrdiff_t high_stride,
29 int len)
30 {
31 low[(0>>1) * low_stride] = av_clip_int16(input[0*in_stride] + input[1*in_stride]);
32 high[(0>>1) * high_stride] = av_clip_int16((5 * input[0*in_stride] - 11 * input[1*in_stride] +
33 4 * input[2*in_stride] + 4 * input[3*in_stride] -
34 1 * input[4*in_stride] - 1 * input[5*in_stride] + 4) >> 3);
35
36 for (int i = 2; i < len - 2; i += 2) {
37 low[(i>>1) * low_stride] = av_clip_int16(input[i*in_stride] + input[(i+1)*in_stride]);
38 high[(i>>1) * high_stride] = av_clip_int16(((-input[(i-2)*in_stride] - input[(i-1)*in_stride] +
39 input[(i+2)*in_stride] + input[(i+3)*in_stride] + 4) >> 3) +
40 input[(i+0)*in_stride] - input[(i+1)*in_stride]);
41 }
42
43 low[((len-2)>>1) * low_stride] = av_clip_int16(input[((len-2)+0)*in_stride] + input[((len-2)+1)*in_stride]);
44 high[((len-2)>>1) * high_stride] = av_clip_int16((11* input[((len-2)+0)*in_stride] - 5 * input[((len-2)+1)*in_stride] -
45 4 * input[((len-2)-1)*in_stride] - 4 * input[((len-2)-2)*in_stride] +
46 1 * input[((len-2)-3)*in_stride] + 1 * input[((len-2)-4)*in_stride] + 4) >> 3);
47 }
48
horiz_filter(int16_t *input, int16_t *low, int16_t *high, ptrdiff_t in_stride, ptrdiff_t low_stride, ptrdiff_t high_stride, int width, int height)49 static void horiz_filter(int16_t *input, int16_t *low, int16_t *high,
50 ptrdiff_t in_stride, ptrdiff_t low_stride,
51 ptrdiff_t high_stride,
52 int width, int height)
53 {
54 for (int i = 0; i < height; i++) {
55 filter(input, 1, low, 1, high, 1, width);
56 input += in_stride;
57 low += low_stride;
58 high += high_stride;
59 }
60 }
61
vert_filter(int16_t *input, int16_t *low, int16_t *high, ptrdiff_t in_stride, ptrdiff_t low_stride, ptrdiff_t high_stride, int width, int height)62 static void vert_filter(int16_t *input, int16_t *low, int16_t *high,
63 ptrdiff_t in_stride, ptrdiff_t low_stride,
64 ptrdiff_t high_stride,
65 int width, int height)
66 {
67 for (int i = 0; i < width; i++)
68 filter(&input[i], in_stride, &low[i], low_stride, &high[i], high_stride, height);
69 }
70
ff_cfhdencdsp_init(CFHDEncDSPContext *c)71 av_cold void ff_cfhdencdsp_init(CFHDEncDSPContext *c)
72 {
73 c->horiz_filter = horiz_filter;
74 c->vert_filter = vert_filter;
75
76 #if ARCH_X86
77 ff_cfhdencdsp_init_x86(c);
78 #endif
79 }
80