Go to the documentation of this file.
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
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  */
19 #include <stdint.h>
21 #include "libavutil/attributes.h"
22 #include "libavutil/cpu.h"
23 #include "libavutil/arm/cpu.h"
24 #include "libavcodec/avcodec.h"
25 #include "libavcodec/pixblockdsp.h"
27 void ff_get_pixels_armv6(int16_t *block, const uint8_t *pixels,
28  ptrdiff_t stride);
29 void ff_diff_pixels_armv6(int16_t *block, const uint8_t *s1,
30  const uint8_t *s2, ptrdiff_t stride);
32 void ff_get_pixels_neon(int16_t *block, const uint8_t *pixels,
33  ptrdiff_t stride);
34 void ff_get_pixels_unaligned_neon(int16_t *block, const uint8_t *pixels,
35  ptrdiff_t stride);
36 void ff_diff_pixels_neon(int16_t *block, const uint8_t *s1,
37  const uint8_t *s2, ptrdiff_t stride);
38 void ff_diff_pixels_unaligned_neon(int16_t *block, const uint8_t *s1,
39  const uint8_t *s2, ptrdiff_t stride);
42  AVCodecContext *avctx,
43  unsigned high_bit_depth)
44 {
47  if (have_armv6(cpu_flags)) {
48  if (!high_bit_depth)
51  }
53  if (have_neon(cpu_flags)) {
54  if (!high_bit_depth) {
57  }
60  }
61 }
#define have_armv6(flags)
Definition: cpu.h:26
static atomic_int cpu_flags
Definition: cpu.c:50
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
#define av_cold
Definition: attributes.h:88
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:35
void ff_diff_pixels_unaligned_neon(int16_t *block, const uint8_t *s1, const uint8_t *s2, ptrdiff_t stride)
#define s2
Definition: regdef.h:39
void ff_get_pixels_armv6(int16_t *block, const uint8_t *pixels, ptrdiff_t stride)
#define have_neon(flags)
Definition: cpu.h:26
av_cold void ff_pixblockdsp_init_arm(PixblockDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:531
void ff_get_pixels_unaligned_neon(int16_t *block, const uint8_t *pixels, ptrdiff_t stride)
void ff_get_pixels_neon(int16_t *block, const uint8_t *pixels, ptrdiff_t stride)
#define s1
Definition: regdef.h:38
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:95
void(* get_pixels_unaligned)(int16_t *av_restrict block, const uint8_t *pixels, ptrdiff_t stride)
Definition: pixblockdsp.h:32
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:39
void ff_diff_pixels_armv6(int16_t *block, const uint8_t *s1, const uint8_t *s2, ptrdiff_t stride)
void ff_diff_pixels_neon(int16_t *block, const uint8_t *s1, const uint8_t *s2, ptrdiff_t stride)