FFmpeg
pixblockdsp.c
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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 #include <stdint.h>
20 
21 #include "config.h"
22 #include "libavutil/attributes.h"
23 #include "libavutil/intreadwrite.h"
24 #include "avcodec.h"
25 #include "pixblockdsp.h"
26 
27 static void get_pixels_16_c(int16_t *av_restrict block, const uint8_t *pixels,
28  ptrdiff_t stride)
29 {
30  AV_COPY128U(block + 0 * 8, pixels + 0 * stride);
31  AV_COPY128U(block + 1 * 8, pixels + 1 * stride);
32  AV_COPY128U(block + 2 * 8, pixels + 2 * stride);
33  AV_COPY128U(block + 3 * 8, pixels + 3 * stride);
34  AV_COPY128U(block + 4 * 8, pixels + 4 * stride);
35  AV_COPY128U(block + 5 * 8, pixels + 5 * stride);
36  AV_COPY128U(block + 6 * 8, pixels + 6 * stride);
37  AV_COPY128U(block + 7 * 8, pixels + 7 * stride);
38 }
39 
40 static void get_pixels_8_c(int16_t *av_restrict block, const uint8_t *pixels,
41  ptrdiff_t stride)
42 {
43  int i;
44 
45  /* read the pixels */
46  for (i = 0; i < 8; i++) {
47  block[0] = pixels[0];
48  block[1] = pixels[1];
49  block[2] = pixels[2];
50  block[3] = pixels[3];
51  block[4] = pixels[4];
52  block[5] = pixels[5];
53  block[6] = pixels[6];
54  block[7] = pixels[7];
55  pixels += stride;
56  block += 8;
57  }
58 }
59 
60 static void diff_pixels_c(int16_t *av_restrict block, const uint8_t *s1,
61  const uint8_t *s2, ptrdiff_t stride)
62 {
63  int i;
64 
65  /* read the pixels */
66  for (i = 0; i < 8; i++) {
67  block[0] = s1[0] - s2[0];
68  block[1] = s1[1] - s2[1];
69  block[2] = s1[2] - s2[2];
70  block[3] = s1[3] - s2[3];
71  block[4] = s1[4] - s2[4];
72  block[5] = s1[5] - s2[5];
73  block[6] = s1[6] - s2[6];
74  block[7] = s1[7] - s2[7];
75  s1 += stride;
76  s2 += stride;
77  block += 8;
78  }
79 }
80 
82 {
83  const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;
84 
85  c->diff_pixels_unaligned =
86  c->diff_pixels = diff_pixels_c;
87 
88  switch (avctx->bits_per_raw_sample) {
89  case 9:
90  case 10:
91  case 12:
92  case 14:
93  c->get_pixels_unaligned =
94  c->get_pixels = get_pixels_16_c;
95  break;
96  default:
97  if (avctx->bits_per_raw_sample<=8 || avctx->codec_type != AVMEDIA_TYPE_VIDEO) {
98  c->get_pixels_unaligned =
99  c->get_pixels = get_pixels_8_c;
100  }
101  break;
102  }
103 
104  if (ARCH_AARCH64)
105  ff_pixblockdsp_init_aarch64(c, avctx, high_bit_depth);
106  if (ARCH_ALPHA)
107  ff_pixblockdsp_init_alpha(c, avctx, high_bit_depth);
108  if (ARCH_ARM)
109  ff_pixblockdsp_init_arm(c, avctx, high_bit_depth);
110  if (ARCH_PPC)
111  ff_pixblockdsp_init_ppc(c, avctx, high_bit_depth);
112  if (ARCH_X86)
113  ff_pixblockdsp_init_x86(c, avctx, high_bit_depth);
114  if (ARCH_MIPS)
115  ff_pixblockdsp_init_mips(c, avctx, high_bit_depth);
116 }
stride
int stride
Definition: mace.c:144
ff_pixblockdsp_init_x86
void ff_pixblockdsp_init_x86(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: pixblockdsp_init.c:33
ff_pixblockdsp_init_arm
av_cold void ff_pixblockdsp_init_arm(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: pixblockdsp_init_arm.c:41
ff_pixblockdsp_init_mips
void ff_pixblockdsp_init_mips(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: pixblockdsp_init_mips.c:25
ff_pixblockdsp_init
av_cold void ff_pixblockdsp_init(PixblockDSPContext *c, AVCodecContext *avctx)
Definition: pixblockdsp.c:81
ff_pixblockdsp_init_ppc
av_cold void ff_pixblockdsp_init_ppc(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: pixblockdsp.c:265
av_cold
#define av_cold
Definition: attributes.h:90
intreadwrite.h
s1
#define s1
Definition: regdef.h:38
AVCodecContext::bits_per_raw_sample
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1425
get_pixels_16_c
static void get_pixels_16_c(int16_t *av_restrict block, const uint8_t *pixels, ptrdiff_t stride)
Definition: pixblockdsp.c:27
PixblockDSPContext
Definition: pixblockdsp.h:28
AV_COPY128U
#define AV_COPY128U(d, s)
Definition: intreadwrite.h:580
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
s2
#define s2
Definition: regdef.h:39
get_pixels_8_c
static void get_pixels_8_c(int16_t *av_restrict block, const uint8_t *pixels, ptrdiff_t stride)
Definition: pixblockdsp.c:40
attributes.h
ff_pixblockdsp_init_alpha
av_cold void ff_pixblockdsp_init_alpha(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: pixblockdsp_alpha.c:71
i
int i
Definition: input.c:406
avcodec.h
AVCodecContext
main external API structure.
Definition: avcodec.h:383
diff_pixels_c
static void diff_pixels_c(int16_t *av_restrict block, const uint8_t *s1, const uint8_t *s2, ptrdiff_t stride)
Definition: pixblockdsp.c:60
AVCodecContext::codec_type
enum AVMediaType codec_type
Definition: avcodec.h:391
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
ff_pixblockdsp_init_aarch64
av_cold void ff_pixblockdsp_init_aarch64(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: pixblockdsp_init_aarch64.c:32
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
pixblockdsp.h