FFmpeg
takdsp_init.c
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1 /*
2  * Copyright (c) 2015 Paul B Mahol
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/attributes.h"
22 #include "libavcodec/takdsp.h"
23 #include "libavutil/x86/cpu.h"
24 #include "config.h"
25 
26 void ff_tak_decorrelate_ls_sse2(int32_t *p1, int32_t *p2, int length);
27 void ff_tak_decorrelate_sr_sse2(int32_t *p1, int32_t *p2, int length);
28 void ff_tak_decorrelate_sm_sse2(int32_t *p1, int32_t *p2, int length);
29 void ff_tak_decorrelate_sf_sse4(int32_t *p1, int32_t *p2, int length, int dshift, int dfactor);
30 
32 {
33 #if HAVE_X86ASM
35 
36  if (EXTERNAL_SSE2(cpu_flags)) {
37  c->decorrelate_ls = ff_tak_decorrelate_ls_sse2;
38  c->decorrelate_sr = ff_tak_decorrelate_sr_sse2;
39  c->decorrelate_sm = ff_tak_decorrelate_sm_sse2;
40  }
41 
42  if (EXTERNAL_SSE4(cpu_flags)) {
43  c->decorrelate_sf = ff_tak_decorrelate_sf_sse4;
44  }
45 #endif
46 }
cpu.h
TAKDSPContext
Definition: takdsp.h:24
av_get_cpu_flags
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:95
cpu_flags
static atomic_int cpu_flags
Definition: cpu.c:50
ff_tak_decorrelate_sr_sse2
void ff_tak_decorrelate_sr_sse2(int32_t *p1, int32_t *p2, int length)
ff_tak_decorrelate_sm_sse2
void ff_tak_decorrelate_sm_sse2(int32_t *p1, int32_t *p2, int length)
av_cold
#define av_cold
Definition: attributes.h:90
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_takdsp_init_x86
av_cold void ff_takdsp_init_x86(TAKDSPContext *c)
Definition: takdsp_init.c:31
takdsp.h
attributes.h
EXTERNAL_SSE2
#define EXTERNAL_SSE2(flags)
Definition: cpu.h:59
ff_tak_decorrelate_ls_sse2
void ff_tak_decorrelate_ls_sse2(int32_t *p1, int32_t *p2, int length)
EXTERNAL_SSE4
#define EXTERNAL_SSE4(flags)
Definition: cpu.h:68
ff_tak_decorrelate_sf_sse4
void ff_tak_decorrelate_sf_sse4(int32_t *p1, int32_t *p2, int length, int dshift, int dfactor)
int32_t
int32_t
Definition: audioconvert.c:56