FFmpeg: libavfilter/x86/vf_convolution_init.c Source File

FFmpeg

vf_convolution_init.c

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1 /*

2 *

3 * This file is part of FFmpeg.

4 *

5 * FFmpeg is free software; you can redistribute it and/or

6 * modify it under the terms of the GNU Lesser General Public

7 * License as published by the Free Software Foundation; either

8 * version 2.1 of the License, or (at your option) any later version.

9 *

10 * FFmpeg is distributed in the hope that it will be useful,

11 * but WITHOUT ANY WARRANTY; without even the implied warranty of

12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

13 * Lesser General Public License for more details.

14 *

15 * You should have received a copy of the GNU Lesser General Public

16 * License along with FFmpeg; if not, write to the Free Software

17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

18 */

19

20 #include "config.h"

21

22 #include "libavutil/attributes.h"

23 #include "libavutil/cpu.h"

24 #include "libavutil/x86/cpu.h"

25 #include "libavfilter/convolution.h"

26

27 void ff_filter_3x3_sse4(uint8_t *dst, int width,

28 float rdiv, float bias, const int *const matrix,

29 const uint8_t *c[], int peak, int radius,

30 int dstride, int stride, int size);

31

32 av_cold void ff_convolution_init_x86(ConvolutionContext *s)

33 {

34 #if ARCH_X86_64

35 int i;

36 int cpu_flags = av_get_cpu_flags();

37 for (i = 0; i < 4; i++) {

38 if (s->mode[i] == MATRIX_SQUARE) {

39 if (s->matrix_length[i] == 9 && s->depth == 8) {

40 if (EXTERNAL_SSE4(cpu_flags))

41 s->filter[i] = ff_filter_3x3_sse4;

42 }

43 }

44 }

45 #endif

46 }

int stride

Definition: mace.c:144

av_get_cpu_flags

int av_get_cpu_flags(void)

Return the flags which specify extensions supported by the CPU.

Definition: cpu.c:98

static atomic_int cpu_flags

Definition: cpu.c:50

#define av_cold

Definition: attributes.h:90

#define width

s

#define s(width, name)

Definition: cbs_vp9.c:257

@ MATRIX_SQUARE

Definition: convolution.h:26

ConvolutionContext

Definition: convolution.h:32

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

ff_convolution_init_x86

av_cold void ff_convolution_init_x86(ConvolutionContext *s)

Definition: vf_convolution_init.c:32

int size

Definition: twinvq_data.h:10344

i

#define i(width, name, range_min, range_max)

Definition: cbs_h2645.c:271

#define EXTERNAL_SSE4(flags)

Definition: cpu.h:68

ff_filter_3x3_sse4

void ff_filter_3x3_sse4(uint8_t *dst, int width, float rdiv, float bias, const int *const matrix, const uint8_t *c[], int peak, int radius, int dstride, int stride, int size)

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