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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
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  */
22 #include <stddef.h>
23 #include <stdint.h>
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"
33 void ff_add_pixels_clamped_arm(const int16_t *block, uint8_t *dest,
34  ptrdiff_t line_size);
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 {
41  ff_j_rev_dct_arm(block);
42  ff_put_pixels_clamped_c(block, dest, line_size);
43 }
45 static void j_rev_dct_arm_add(uint8_t *dest, ptrdiff_t line_size,
46  int16_t *block)
47 {
48  ff_j_rev_dct_arm(block);
49  ff_add_pixels_clamped_arm(block, dest, line_size);
50 }
52 static void simple_idct_arm_put(uint8_t *dest, ptrdiff_t line_size,
53  int16_t *block)
54 {
55  ff_simple_idct_arm(block);
56  ff_put_pixels_clamped_c(block, dest, line_size);
57 }
59 static void simple_idct_arm_add(uint8_t *dest, ptrdiff_t line_size,
60  int16_t *block)
61 {
62  ff_simple_idct_arm(block);
63  ff_add_pixels_clamped_arm(block, dest, line_size);
64 }
67  unsigned high_bit_depth)
68 {
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) {
78  } else if (avctx->idct_algo == FF_IDCT_SIMPLEARM) {
83  }
84  }
88  if (have_armv5te(cpu_flags))
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 }
#define have_armv6(flags)
Definition: cpu.h:26
void ff_idctdsp_init_neon(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
static atomic_int cpu_flags
Definition: cpu.c:50
Macro definitions for various function/variable attributes.
void ff_j_rev_dct_arm(int16_t *data)
The exact code depends on how similar the blocks are and how related they are to the block
#define av_cold
Definition: attributes.h:88
#define have_armv5te(flags)
Definition: cpu.h:25
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
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:1749
#define FF_IDCT_ARM
Definition: avcodec.h:1719
#define FF_IDCT_AUTO
Definition: avcodec.h:1715
Definition: avcodec.h:1721
int flags
Definition: avcodec.h:611
void ff_simple_idct_arm(int16_t *data)
#define have_neon(flags)
Definition: cpu.h:26
Use only bitexact stuff (except (I)DCT).
Definition: avcodec.h:333
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:1714
void(* idct_add)(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
block -> idct -> add dest -> clip to unsigned 8 bit -> dest.
Definition: idctdsp.h:79
void ff_idctdsp_init_armv5te(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
void ff_idctdsp_init_armv6(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
void(* idct_put)(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
block -> idct -> clip to unsigned 8 bit -> dest.
Definition: idctdsp.h:72
void ff_put_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels, ptrdiff_t line_size)
Definition: idctdsp.c:83
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:531
static void j_rev_dct_arm_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
av_cold void ff_idctdsp_init_arm(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:95
static void j_rev_dct_arm_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
static void simple_idct_arm_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
static void simple_idct_arm_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
void ff_add_pixels_clamped_arm(const int16_t *block, uint8_t *dest, ptrdiff_t line_size)
void(* idct)(int16_t *block)
Definition: idctdsp.h:65
enum idct_permutation_type perm_type
Definition: idctdsp.h:97
void(* add_pixels_clamped)(const int16_t *block, uint8_t *av_restrict pixels, ptrdiff_t line_size)
Definition: idctdsp.h:61