FFmpeg
idctdsp_init_neon.c
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1 /*
2  * ARM-NEON-optimized IDCT functions
3  * Copyright (c) 2008 Mans Rullgard <mans@mansr.com>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <stdint.h>
23 
24 #include "libavutil/attributes.h"
25 #include "libavcodec/avcodec.h"
26 #include "libavcodec/idctdsp.h"
27 #include "idct.h"
28 #include "idctdsp_arm.h"
29 
30 void ff_add_pixels_clamped_neon(const int16_t *, uint8_t *, ptrdiff_t);
31 void ff_put_pixels_clamped_neon(const int16_t *, uint8_t *, ptrdiff_t);
32 void ff_put_signed_pixels_clamped_neon(const int16_t *, uint8_t *, ptrdiff_t);
33 
35  unsigned high_bit_depth)
36 {
37  if (!avctx->lowres && !high_bit_depth) {
38  if (avctx->idct_algo == FF_IDCT_AUTO ||
39  avctx->idct_algo == FF_IDCT_SIMPLEAUTO ||
40  avctx->idct_algo == FF_IDCT_SIMPLENEON) {
41  c->idct_put = ff_simple_idct_put_neon;
42  c->idct_add = ff_simple_idct_add_neon;
43  c->idct = ff_simple_idct_neon;
44  c->perm_type = FF_IDCT_PERM_PARTTRANS;
45  }
46  }
47 
48  c->add_pixels_clamped = ff_add_pixels_clamped_neon;
49  c->put_pixels_clamped = ff_put_pixels_clamped_neon;
50  c->put_signed_pixels_clamped = ff_put_signed_pixels_clamped_neon;
51 }
ff_simple_idct_put_neon
void ff_simple_idct_put_neon(uint8_t *dest, ptrdiff_t line_size, int16_t *data)
FF_IDCT_AUTO
#define FF_IDCT_AUTO
Definition: avcodec.h:1504
FF_IDCT_SIMPLEAUTO
#define FF_IDCT_SIMPLEAUTO
Definition: avcodec.h:1517
idctdsp_arm.h
av_cold
#define av_cold
Definition: attributes.h:90
ff_add_pixels_clamped_neon
void ff_add_pixels_clamped_neon(const int16_t *, uint8_t *, ptrdiff_t)
ff_idctdsp_init_neon
av_cold void ff_idctdsp_init_neon(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: idctdsp_init_neon.c:34
ff_simple_idct_neon
void ff_simple_idct_neon(int16_t *data)
idct.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
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
ff_put_signed_pixels_clamped_neon
void ff_put_signed_pixels_clamped_neon(const int16_t *, uint8_t *, ptrdiff_t)
IDCTDSPContext
Definition: idctdsp.h:53
ff_put_pixels_clamped_neon
void ff_put_pixels_clamped_neon(const int16_t *, uint8_t *, ptrdiff_t)
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)