FFmpeg
blockdsp.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 #include <string.h>
21 
22 #include "config.h"
23 #include "libavutil/attributes.h"
24 #include "avcodec.h"
25 #include "blockdsp.h"
26 #include "version.h"
27 
28 static void clear_block_c(int16_t *block)
29 {
30  memset(block, 0, sizeof(int16_t) * 64);
31 }
32 
33 static void clear_blocks_c(int16_t *blocks)
34 {
35  memset(blocks, 0, sizeof(int16_t) * 6 * 64);
36 }
37 
38 static void fill_block16_c(uint8_t *block, uint8_t value, ptrdiff_t line_size,
39  int h)
40 {
41  int i;
42 
43  for (i = 0; i < h; i++) {
44  memset(block, value, 16);
45  block += line_size;
46  }
47 }
48 
49 static void fill_block8_c(uint8_t *block, uint8_t value, ptrdiff_t line_size,
50  int h)
51 {
52  int i;
53 
54  for (i = 0; i < h; i++) {
55  memset(block, value, 8);
56  block += line_size;
57  }
58 }
59 
61 {
64 
67 
68  if (ARCH_ALPHA)
70  if (ARCH_ARM)
72  if (ARCH_PPC)
74  if (ARCH_X86)
75  ff_blockdsp_init_x86(c, avctx);
76  if (ARCH_MIPS)
78 }
av_cold void ff_blockdsp_init_alpha(BlockDSPContext *c)
void(* clear_block)(int16_t *block)
Definition: blockdsp.h:36
av_cold void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx)
Definition: blockdsp.c:60
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
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:108
av_cold void ff_blockdsp_init_arm(BlockDSPContext *c)
Libavcodec version macros.
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
void ff_blockdsp_init_x86(BlockDSPContext *c, AVCodecContext *avctx)
Definition: blockdsp_init.c:36
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:37
static void clear_blocks_c(int16_t *blocks)
Definition: blockdsp.c:33
void ff_blockdsp_init_mips(BlockDSPContext *c)
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1565
static void fill_block16_c(uint8_t *block, uint8_t value, ptrdiff_t line_size, int h)
Definition: blockdsp.c:38
av_cold void ff_blockdsp_init_ppc(BlockDSPContext *c)
Definition: blockdsp.c:145
static void clear_block_c(int16_t *block)
Definition: blockdsp.c:28
static void fill_block8_c(uint8_t *block, uint8_t value, ptrdiff_t line_size, int h)
Definition: blockdsp.c:49
op_fill_func fill_block_tab[2]
Definition: blockdsp.h:39