FFmpeg  4.4
cfhdencdsp.c
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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 #include "libavutil/avassert.h"
24 
25 #include "cfhdencdsp.h"
26 
27 static av_always_inline void filter(int16_t *input, ptrdiff_t in_stride,
28  int16_t *low, ptrdiff_t low_stride,
29  int16_t *high, ptrdiff_t high_stride,
30  int len)
31 {
32  low[(0>>1) * low_stride] = av_clip_int16(input[0*in_stride] + input[1*in_stride]);
33  high[(0>>1) * high_stride] = av_clip_int16((5 * input[0*in_stride] - 11 * input[1*in_stride] +
34  4 * input[2*in_stride] + 4 * input[3*in_stride] -
35  1 * input[4*in_stride] - 1 * input[5*in_stride] + 4) >> 3);
36 
37  for (int i = 2; i < len - 2; i += 2) {
38  low[(i>>1) * low_stride] = av_clip_int16(input[i*in_stride] + input[(i+1)*in_stride]);
39  high[(i>>1) * high_stride] = av_clip_int16(((-input[(i-2)*in_stride] - input[(i-1)*in_stride] +
40  input[(i+2)*in_stride] + input[(i+3)*in_stride] + 4) >> 3) +
41  input[(i+0)*in_stride] - input[(i+1)*in_stride]);
42  }
43 
44  low[((len-2)>>1) * low_stride] = av_clip_int16(input[((len-2)+0)*in_stride] + input[((len-2)+1)*in_stride]);
45  high[((len-2)>>1) * high_stride] = av_clip_int16((11* input[((len-2)+0)*in_stride] - 5 * input[((len-2)+1)*in_stride] -
46  4 * input[((len-2)-1)*in_stride] - 4 * input[((len-2)-2)*in_stride] +
47  1 * input[((len-2)-3)*in_stride] + 1 * input[((len-2)-4)*in_stride] + 4) >> 3);
48 }
49 
50 static void horiz_filter(int16_t *input, int16_t *low, int16_t *high,
51  ptrdiff_t in_stride, ptrdiff_t low_stride,
52  ptrdiff_t high_stride,
53  int width, int height)
54 {
55  for (int i = 0; i < height; i++) {
56  filter(input, 1, low, 1, high, 1, width);
57  input += in_stride;
58  low += low_stride;
59  high += high_stride;
60  }
61 }
62 
63 static void vert_filter(int16_t *input, int16_t *low, int16_t *high,
64  ptrdiff_t in_stride, ptrdiff_t low_stride,
65  ptrdiff_t high_stride,
66  int width, int height)
67 {
68  for (int i = 0; i < width; i++)
69  filter(&input[i], in_stride, &low[i], low_stride, &high[i], high_stride, height);
70 }
71 
73 {
74  c->horiz_filter = horiz_filter;
75  c->vert_filter = vert_filter;
76 
77  if (ARCH_X86)
79 }
Macro definitions for various function/variable attributes.
#define av_always_inline
Definition: attributes.h:45
#define av_cold
Definition: attributes.h:88
simple assert() macros that are a bit more flexible than ISO C assert().
static av_always_inline void filter(int16_t *input, ptrdiff_t in_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len)
Definition: cfhdencdsp.c:27
static void 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)
Definition: cfhdencdsp.c:50
av_cold void ff_cfhdencdsp_init(CFHDEncDSPContext *c)
Definition: cfhdencdsp.c:72
static void 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)
Definition: cfhdencdsp.c:63
void ff_cfhdencdsp_init_x86(CFHDEncDSPContext *c)
common internal and external API header
#define av_clip_int16
Definition: common.h:137
#define ARCH_X86
Definition: config.h:39
int i
Definition: input.c:407
#define height
#define width
int len
static double c[64]