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vf_blackdetect.h
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #ifndef AVFILTER_BLACKDETECT_H
20 #define AVFILTER_BLACKDETECT_H
21 
22 #include <stddef.h>
23 #include <stdint.h>
24 
25 typedef unsigned (*ff_blackdetect_fn)(const uint8_t *src, ptrdiff_t stride,
26  ptrdiff_t width, ptrdiff_t height,
27  unsigned threshold);
28 
30 
31 static unsigned count_pixels8_c(const uint8_t *src, ptrdiff_t stride,
32  ptrdiff_t width, ptrdiff_t height,
33  unsigned threshold)
34 {
35  unsigned int counter = 0;
36  while (height--) {
37  for (int x = 0; x < width; x++)
38  counter += src[x] <= threshold;
39  src += stride;
40  }
41  return counter;
42 }
43 
44 static unsigned count_pixels16_c(const uint8_t *src, ptrdiff_t stride,
45  ptrdiff_t width, ptrdiff_t height,
46  unsigned threshold)
47 {
48  unsigned int counter = 0;
49  while (height--) {
50  const uint16_t *src16 = (const uint16_t *) src;
51  for (int x = 0; x < width; x++)
52  counter += src16[x] <= threshold;
53  src += stride;
54  }
55  return counter;
56 }
57 
58 
59 static inline ff_blackdetect_fn ff_blackdetect_get_fn(int depth)
60 {
62 #if ARCH_X86
64 #endif
65 
66  if (!fn)
67  fn = depth == 8 ? count_pixels8_c : count_pixels16_c;
68  return fn;
69 }
70 
71 #endif /* AVFILTER_BLACKDETECT_H */
count_pixels16_c
static unsigned count_pixels16_c(const uint8_t *src, ptrdiff_t stride, ptrdiff_t width, ptrdiff_t height, unsigned threshold)
Definition: vf_blackdetect.h:44
NULL
#define NULL
Definition: coverity.c:32
ff_blackdetect_fn
unsigned(* ff_blackdetect_fn)(const uint8_t *src, ptrdiff_t stride, ptrdiff_t width, ptrdiff_t height, unsigned threshold)
Definition: vf_blackdetect.h:25
height
#define height
Definition: dsp.h:89
fn
#define fn(a)
Definition: aap_template.c:37
count_pixels8_c
static unsigned count_pixels8_c(const uint8_t *src, ptrdiff_t stride, ptrdiff_t width, ptrdiff_t height, unsigned threshold)
Definition: vf_blackdetect.h:31
stride
#define stride
Definition: h264pred_template.c:536
ff_blackdetect_get_fn
static ff_blackdetect_fn ff_blackdetect_get_fn(int depth)
Definition: vf_blackdetect.h:59
ff_blackdetect_get_fn_x86
ff_blackdetect_fn ff_blackdetect_get_fn_x86(int depth)
Definition: vf_blackdetect_init.c:28
width
#define width
Definition: dsp.h:89
src
#define src
Definition: vp8dsp.c:248