FFmpeg
idctdsp_init_arm.c
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1 /*
2  * ARM-optimized IDCT functions
3  * Copyright (c) 2001 Lionel Ulmer
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 <stddef.h>
23 #include <stdint.h>
24 
25 #include "libavutil/attributes.h"
26 #include "libavutil/cpu.h"
27 #include "libavutil/arm/cpu.h"
28 #include "libavcodec/avcodec.h"
29 #include "libavcodec/idctdsp.h"
30 #include "idct.h"
31 #include "idctdsp_arm.h"
32 
33 void ff_add_pixels_clamped_arm(const int16_t *block, uint8_t *dest,
34  ptrdiff_t line_size);
35 
36 /* XXX: those functions should be suppressed ASAP when all IDCTs are
37  * converted */
38 static void j_rev_dct_arm_put(uint8_t *dest, ptrdiff_t line_size,
39  int16_t *block)
40 {
42  ff_put_pixels_clamped_c(block, dest, line_size);
43 }
44 
45 static void j_rev_dct_arm_add(uint8_t *dest, ptrdiff_t line_size,
46  int16_t *block)
47 {
49  ff_add_pixels_clamped_arm(block, dest, line_size);
50 }
51 
52 static void simple_idct_arm_put(uint8_t *dest, ptrdiff_t line_size,
53  int16_t *block)
54 {
56  ff_put_pixels_clamped_c(block, dest, line_size);
57 }
58 
59 static void simple_idct_arm_add(uint8_t *dest, ptrdiff_t line_size,
60  int16_t *block)
61 {
63  ff_add_pixels_clamped_arm(block, dest, line_size);
64 }
65 
67  unsigned high_bit_depth)
68 {
70 
71  if (!avctx->lowres && !high_bit_depth) {
72  if ((avctx->idct_algo == FF_IDCT_AUTO && !(avctx->flags & AV_CODEC_FLAG_BITEXACT)) ||
73  avctx->idct_algo == FF_IDCT_ARM) {
74  c->idct_put = j_rev_dct_arm_put;
75  c->idct_add = j_rev_dct_arm_add;
76  c->idct = ff_j_rev_dct_arm;
77  c->perm_type = FF_IDCT_PERM_LIBMPEG2;
78  } else if (avctx->idct_algo == FF_IDCT_SIMPLEARM) {
79  c->idct_put = simple_idct_arm_put;
80  c->idct_add = simple_idct_arm_add;
81  c->idct = ff_simple_idct_arm;
82  c->perm_type = FF_IDCT_PERM_NONE;
83  }
84  }
85 
86  c->add_pixels_clamped = ff_add_pixels_clamped_arm;
87 
89  ff_idctdsp_init_armv5te(c, avctx, high_bit_depth);
90  if (have_armv6(cpu_flags))
91  ff_idctdsp_init_armv6(c, avctx, high_bit_depth);
92  if (have_neon(cpu_flags))
93  ff_idctdsp_init_neon(c, avctx, high_bit_depth);
94 }
simple_idct_arm_put
static void simple_idct_arm_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
Definition: idctdsp_init_arm.c:52
ff_idctdsp_init_arm
av_cold void ff_idctdsp_init_arm(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: idctdsp_init_arm.c:66
simple_idct_arm_add
static void simple_idct_arm_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
Definition: idctdsp_init_arm.c:59
j_rev_dct_arm_put
static void j_rev_dct_arm_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
Definition: idctdsp_init_arm.c:38
av_get_cpu_flags
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:96
cpu_flags
static atomic_int cpu_flags
Definition: cpu.c:50
FF_IDCT_AUTO
#define FF_IDCT_AUTO
Definition: avcodec.h:1398
ff_idctdsp_init_neon
void ff_idctdsp_init_neon(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: idctdsp_init_neon.c:34
ff_add_pixels_clamped_arm
void ff_add_pixels_clamped_arm(const int16_t *block, uint8_t *dest, ptrdiff_t line_size)
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:463
ff_idctdsp_init_armv6
void ff_idctdsp_init_armv6(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: idctdsp_init_armv6.c:32
idctdsp_arm.h
av_cold
#define av_cold
Definition: attributes.h:90
FF_IDCT_ARM
#define FF_IDCT_ARM
Definition: avcodec.h:1402
have_armv5te
#define have_armv5te(flags)
Definition: cpu.h:25
cpu.h
FF_IDCT_SIMPLEARM
#define FF_IDCT_SIMPLEARM
Definition: avcodec.h:1404
idct.h
j_rev_dct_arm_add
static void j_rev_dct_arm_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
Definition: idctdsp_init_arm.c:45
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_simple_idct_arm
void ff_simple_idct_arm(int16_t *data)
AVCodecContext::lowres
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:1432
cpu.h
FF_IDCT_PERM_NONE
@ FF_IDCT_PERM_NONE
Definition: idctdsp.h:38
have_neon
#define have_neon(flags)
Definition: cpu.h:26
attributes.h
ff_put_pixels_clamped_c
void ff_put_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels, ptrdiff_t line_size)
Definition: idctdsp.c:83
AVCodecContext::idct_algo
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:1397
idctdsp.h
avcodec.h
IDCTDSPContext
Definition: idctdsp.h:53
AVCodecContext
main external API structure.
Definition: avcodec.h:383
ff_idctdsp_init_armv5te
void ff_idctdsp_init_armv5te(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: idctdsp_init_armv5te.c:29
AV_CODEC_FLAG_BITEXACT
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
Definition: avcodec.h:272
have_armv6
#define have_armv6(flags)
Definition: cpu.h:26
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
ff_j_rev_dct_arm
void ff_j_rev_dct_arm(int16_t *data)
FF_IDCT_PERM_LIBMPEG2
@ FF_IDCT_PERM_LIBMPEG2
Definition: idctdsp.h:39