FFmpeg
ac3dsp_init_arm.c
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1 /*
2  * Copyright (c) 2011 Mans Rullgard <mans@mansr.com>
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 <stdint.h>
22 
23 #include "libavutil/arm/cpu.h"
24 #include "libavutil/attributes.h"
25 #include "libavcodec/ac3dsp.h"
26 #include "config.h"
27 
28 void ff_ac3_exponent_min_neon(uint8_t *exp, int num_reuse_blocks, int nb_coefs);
29 void ff_float_to_fixed24_neon(int32_t *dst, const float *src, unsigned int len);
30 void ff_ac3_extract_exponents_neon(uint8_t *exp, int32_t *coef, int nb_coefs);
31 void ff_ac3_sum_square_butterfly_int32_neon(int64_t sum[4],
32  const int32_t *coef0,
33  const int32_t *coef1,
34  int len);
36  const float *coef0,
37  const float *coef1,
38  int len);
39 
40 void ff_ac3_bit_alloc_calc_bap_armv6(int16_t *mask, int16_t *psd,
41  int start, int end,
42  int snr_offset, int floor,
43  const uint8_t *bap_tab, uint8_t *bap);
44 
45 void ff_ac3_update_bap_counts_arm(uint16_t mant_cnt[16], uint8_t *bap, int len);
46 
48 {
50 
51  c->update_bap_counts = ff_ac3_update_bap_counts_arm;
52 
53  if (have_armv6(cpu_flags)) {
54  c->bit_alloc_calc_bap = ff_ac3_bit_alloc_calc_bap_armv6;
55  }
56 
57  if (have_neon(cpu_flags)) {
58  c->ac3_exponent_min = ff_ac3_exponent_min_neon;
59  c->float_to_fixed24 = ff_float_to_fixed24_neon;
60  c->extract_exponents = ff_ac3_extract_exponents_neon;
61  c->sum_square_butterfly_int32 = ff_ac3_sum_square_butterfly_int32_neon;
62  c->sum_square_butterfly_float = ff_ac3_sum_square_butterfly_float_neon;
63  }
64 }
nb_coefs
static int nb_coefs(int length, int level, uint64_t sn)
Definition: af_afwtdn.c:532
AC3DSPContext
Definition: ac3dsp.h:33
ff_ac3_bit_alloc_calc_bap_armv6
void ff_ac3_bit_alloc_calc_bap_armv6(int16_t *mask, int16_t *psd, int start, int end, int snr_offset, int floor, const uint8_t *bap_tab, uint8_t *bap)
av_get_cpu_flags
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:96
ff_ac3_update_bap_counts_arm
void ff_ac3_update_bap_counts_arm(uint16_t mant_cnt[16], uint8_t *bap, int len)
ff_ac3dsp_init_arm
av_cold void ff_ac3dsp_init_arm(AC3DSPContext *c, int bit_exact)
Definition: ac3dsp_init_arm.c:47
cpu_flags
static atomic_int cpu_flags
Definition: cpu.c:50
av_cold
#define av_cold
Definition: attributes.h:90
mask
static const uint16_t mask[17]
Definition: lzw.c:38
floor
static __device__ float floor(float a)
Definition: cuda_runtime.h:173
bap_tab
static const uint8_t bap_tab[64]
Definition: dolby_e.c:590
ff_float_to_fixed24_neon
void ff_float_to_fixed24_neon(int32_t *dst, const float *src, unsigned int len)
src
#define src
Definition: vp8dsp.c:255
ac3dsp.h
cpu.h
exp
int8_t exp
Definition: eval.c:72
ff_ac3_sum_square_butterfly_int32_neon
void ff_ac3_sum_square_butterfly_int32_neon(int64_t sum[4], const int32_t *coef0, const int32_t *coef1, int len)
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_ac3_sum_square_butterfly_float_neon
void ff_ac3_sum_square_butterfly_float_neon(float sum[4], const float *coef0, const float *coef1, int len)
have_neon
#define have_neon(flags)
Definition: cpu.h:26
attributes.h
len
int len
Definition: vorbis_enc_data.h:426
ff_ac3_exponent_min_neon
void ff_ac3_exponent_min_neon(uint8_t *exp, int num_reuse_blocks, int nb_coefs)
ff_ac3_extract_exponents_neon
void ff_ac3_extract_exponents_neon(uint8_t *exp, int32_t *coef, int nb_coefs)
have_armv6
#define have_armv6(flags)
Definition: cpu.h:26
int32_t
int32_t
Definition: audioconvert.c:56