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 
87 
88  switch (avctx->bits_per_raw_sample) {
89  case 9:
90  case 10:
91  case 12:
92  case 14:
94  break;
95  default:
96  if (avctx->bits_per_raw_sample<=8 || avctx->codec_type != AVMEDIA_TYPE_VIDEO) {
98  }
99  break;
100  }
101 
102  if (ARCH_ALPHA)
103  ff_pixblockdsp_init_alpha(c, avctx, high_bit_depth);
104  if (ARCH_ARM)
105  ff_pixblockdsp_init_arm(c, avctx, high_bit_depth);
106  if (ARCH_PPC)
107  ff_pixblockdsp_init_ppc(c, avctx, high_bit_depth);
108  if (ARCH_X86)
109  ff_pixblockdsp_init_x86(c, avctx, high_bit_depth);
110  if (ARCH_MIPS)
111  ff_pixblockdsp_init_mips(c, avctx, high_bit_depth);
112 }
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
void ff_pixblockdsp_init_mips(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:2799
static void get_pixels_16_c(int16_t *av_restrict block, const uint8_t *pixels, ptrdiff_t stride)
Definition: pixblockdsp.c:27
av_cold void ff_pixblockdsp_init_alpha(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Macro definitions for various function/variable attributes.
The exact code depends on how similar the blocks are and how related they are to the block
uint8_t
#define av_cold
Definition: attributes.h:82
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
void(* diff_pixels)(int16_t *av_restrict block, const uint8_t *s1, const uint8_t *s2, ptrdiff_t stride)
Definition: pixblockdsp.h:32
#define AV_COPY128U(d, s)
Definition: intreadwrite.h:580
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define s2
Definition: regdef.h:39
av_cold void ff_pixblockdsp_init(PixblockDSPContext *c, AVCodecContext *avctx)
Definition: pixblockdsp.c:81
av_cold void ff_pixblockdsp_init_arm(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
void ff_pixblockdsp_init_x86(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Libavcodec external API header.
enum AVMediaType codec_type
Definition: avcodec.h:1576
main external API structure.
Definition: avcodec.h:1568
av_cold void ff_pixblockdsp_init_ppc(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: pixblockdsp.c:265
static void get_pixels_8_c(int16_t *av_restrict block, const uint8_t *pixels, ptrdiff_t stride)
Definition: pixblockdsp.c:40
#define s1
Definition: regdef.h:38
void(* get_pixels)(int16_t *av_restrict block, const uint8_t *pixels, ptrdiff_t stride)
Definition: pixblockdsp.h:29
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:104
void(* diff_pixels_unaligned)(int16_t *av_restrict block, const uint8_t *s1, const uint8_t *s2, ptrdiff_t stride)
Definition: pixblockdsp.h:36
int pixels
Definition: avisynth_c.h:390
#define stride