FFmpeg
idctdsp_init_aarch64.c
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1 /*
2  * ARM-NEON-optimized IDCT functions
3  * Copyright (c) 2008 Mans Rullgard <mans@mansr.com>
4  * Copyright (c) 2017 Matthieu Bouron <matthieu.bouron@gmail.com>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "libavutil/attributes.h"
24 #include "libavutil/cpu.h"
25 #include "libavutil/arm/cpu.h"
26 #include "libavcodec/avcodec.h"
27 #include "libavcodec/idctdsp.h"
28 #include "idct.h"
29 
31  unsigned high_bit_depth)
32 {
34 
35  if (have_neon(cpu_flags) && !avctx->lowres && !high_bit_depth) {
36  if (avctx->idct_algo == FF_IDCT_AUTO ||
37  avctx->idct_algo == FF_IDCT_SIMPLEAUTO ||
38  avctx->idct_algo == FF_IDCT_SIMPLENEON) {
39  c->idct_put = ff_simple_idct_put_neon;
40  c->idct_add = ff_simple_idct_add_neon;
41  c->idct = ff_simple_idct_neon;
42  c->perm_type = FF_IDCT_PERM_PARTTRANS;
43  }
44  }
45 }
idct.h
ff_simple_idct_put_neon
void ff_simple_idct_put_neon(uint8_t *dest, ptrdiff_t line_size, int16_t *data)
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_IDCT_AUTO
#define FF_IDCT_AUTO
Definition: avcodec.h:1504
ff_idctdsp_init_aarch64
av_cold void ff_idctdsp_init_aarch64(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: idctdsp_init_aarch64.c:30
FF_IDCT_SIMPLEAUTO
#define FF_IDCT_SIMPLEAUTO
Definition: avcodec.h:1517
av_cold
#define av_cold
Definition: attributes.h:90
ff_simple_idct_neon
void ff_simple_idct_neon(int16_t *data)
cpu.h
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
AVCodecContext::lowres
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:1538
cpu.h
have_neon
#define have_neon(flags)
Definition: cpu.h:26
attributes.h
FF_IDCT_SIMPLENEON
#define FF_IDCT_SIMPLENEON
Definition: avcodec.h:1515
AVCodecContext::idct_algo
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:1503
idctdsp.h
avcodec.h
IDCTDSPContext
Definition: idctdsp.h:53
AVCodecContext
main external API structure.
Definition: avcodec.h:501
FF_IDCT_PERM_PARTTRANS
@ FF_IDCT_PERM_PARTTRANS
Definition: idctdsp.h:42
ff_simple_idct_add_neon
void ff_simple_idct_add_neon(uint8_t *dest, ptrdiff_t line_size, int16_t *data)