FFmpeg
ac3dsp_init.c
Go to the documentation of this file.
1 /*
2  * x86-optimized AC-3 DSP functions
3  * Copyright (c) 2011 Justin Ruggles
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 "libavutil/attributes.h"
23 #include "libavutil/mem.h"
24 #include "libavutil/x86/asm.h"
25 #include "libavutil/x86/cpu.h"
26 #include "libavcodec/ac3.h"
27 #include "libavcodec/ac3dsp.h"
28 
29 void ff_ac3_exponent_min_mmx (uint8_t *exp, int num_reuse_blocks, int nb_coefs);
30 void ff_ac3_exponent_min_mmxext(uint8_t *exp, int num_reuse_blocks, int nb_coefs);
31 void ff_ac3_exponent_min_sse2 (uint8_t *exp, int num_reuse_blocks, int nb_coefs);
32 
33 int ff_ac3_max_msb_abs_int16_mmx (const int16_t *src, int len);
34 int ff_ac3_max_msb_abs_int16_mmxext(const int16_t *src, int len);
35 int ff_ac3_max_msb_abs_int16_sse2 (const int16_t *src, int len);
36 int ff_ac3_max_msb_abs_int16_ssse3(const int16_t *src, int len);
37 
38 void ff_ac3_lshift_int16_mmx (int16_t *src, unsigned int len, unsigned int shift);
39 void ff_ac3_lshift_int16_sse2(int16_t *src, unsigned int len, unsigned int shift);
40 
41 void ff_ac3_rshift_int32_mmx (int32_t *src, unsigned int len, unsigned int shift);
42 void ff_ac3_rshift_int32_sse2(int32_t *src, unsigned int len, unsigned int shift);
43 
44 void ff_float_to_fixed24_3dnow(int32_t *dst, const float *src, unsigned int len);
45 void ff_float_to_fixed24_sse (int32_t *dst, const float *src, unsigned int len);
46 void ff_float_to_fixed24_sse2 (int32_t *dst, const float *src, unsigned int len);
47 
48 int ff_ac3_compute_mantissa_size_sse2(uint16_t mant_cnt[6][16]);
49 
50 void ff_ac3_extract_exponents_sse2 (uint8_t *exp, int32_t *coef, int nb_coefs);
51 void ff_ac3_extract_exponents_ssse3(uint8_t *exp, int32_t *coef, int nb_coefs);
52 
53 void ff_apply_window_int16_round_mmxext(int16_t *output, const int16_t *input,
54  const int16_t *window, unsigned int len);
55 void ff_apply_window_int16_round_sse2(int16_t *output, const int16_t *input,
56  const int16_t *window, unsigned int len);
57 void ff_apply_window_int16_mmxext(int16_t *output, const int16_t *input,
58  const int16_t *window, unsigned int len);
59 void ff_apply_window_int16_sse2(int16_t *output, const int16_t *input,
60  const int16_t *window, unsigned int len);
61 void ff_apply_window_int16_ssse3(int16_t *output, const int16_t *input,
62  const int16_t *window, unsigned int len);
63 void ff_apply_window_int16_ssse3_atom(int16_t *output, const int16_t *input,
64  const int16_t *window, unsigned int len);
65 
67 {
69 
70  if (EXTERNAL_MMX(cpu_flags)) {
75  }
76  if (EXTERNAL_AMD3DNOW(cpu_flags)) {
77  if (!bit_exact) {
79  }
80  }
81  if (EXTERNAL_MMXEXT(cpu_flags)) {
84  if (bit_exact) {
86  } else {
88  }
89  }
90  if (EXTERNAL_SSE(cpu_flags)) {
92  }
93  if (EXTERNAL_SSE2(cpu_flags)) {
99  if (bit_exact) {
101  }
102  }
103 
104  if (EXTERNAL_SSE2_FAST(cpu_flags)) {
107  if (!bit_exact) {
109  }
110  }
111 
112  if (EXTERNAL_SSSE3(cpu_flags)) {
114  if (cpu_flags & AV_CPU_FLAG_ATOM) {
116  } else {
119  }
120  }
121 }
122 
123 #define DOWNMIX_FUNC_OPT(ch, opt) \
124 void ff_ac3_downmix_ ## ch ## _to_1_ ## opt(float **samples, \
125  float **matrix, int len); \
126 void ff_ac3_downmix_ ## ch ## _to_2_ ## opt(float **samples, \
127  float **matrix, int len);
128 
129 #define DOWNMIX_FUNCS(opt) \
130  DOWNMIX_FUNC_OPT(3, opt) \
131  DOWNMIX_FUNC_OPT(4, opt) \
132  DOWNMIX_FUNC_OPT(5, opt) \
133  DOWNMIX_FUNC_OPT(6, opt)
134 
136 DOWNMIX_FUNCS(avx)
137 DOWNMIX_FUNCS(fma3)
138 
140 {
141  int cpu_flags = av_get_cpu_flags();
142 
143 #define SET_DOWNMIX(ch, suf, SUF) \
144  if (ch == c->in_channels) { \
145  if (EXTERNAL_ ## SUF (cpu_flags)) { \
146  if (c->out_channels == 1) \
147  c->downmix = ff_ac3_downmix_ ## ch ## _to_1_ ## suf; \
148  else \
149  c->downmix = ff_ac3_downmix_ ## ch ## _to_2_ ## suf; \
150  } \
151  }
152 
153 #define SET_DOWNMIX_ALL(suf, SUF) \
154  SET_DOWNMIX(3, suf, SUF) \
155  SET_DOWNMIX(4, suf, SUF) \
156  SET_DOWNMIX(5, suf, SUF) \
157  SET_DOWNMIX(6, suf, SUF)
158 
159  SET_DOWNMIX_ALL(sse, SSE)
160  if (!(cpu_flags & AV_CPU_FLAG_AVXSLOW)) {
161  SET_DOWNMIX_ALL(avx, AVX)
162  SET_DOWNMIX_ALL(fma3, FMA3)
163  }
164 }
#define EXTERNAL_MMX(flags)
Definition: cpu.h:56
static int shift(int a, int b)
Definition: sonic.c:82
int ff_ac3_max_msb_abs_int16_sse2(const int16_t *src, int len)
Memory handling functions.
int ff_ac3_max_msb_abs_int16_mmx(const int16_t *src, int len)
void ff_ac3dsp_set_downmix_x86(AC3DSPContext *c)
Definition: ac3dsp_init.c:139
static int sse(MpegEncContext *s, uint8_t *src1, uint8_t *src2, int w, int h, int stride)
static atomic_int cpu_flags
Definition: cpu.c:50
#define EXTERNAL_SSE(flags)
Definition: cpu.h:58
void ff_float_to_fixed24_3dnow(int32_t *dst, const float *src, unsigned int len)
#define src
Definition: vp8dsp.c:254
Macro definitions for various function/variable attributes.
void(* extract_exponents)(uint8_t *exp, int32_t *coef, int nb_coefs)
Definition: ac3dsp.h:127
void ff_float_to_fixed24_sse2(int32_t *dst, const float *src, unsigned int len)
void(* apply_window_int16)(int16_t *output, const int16_t *input, const int16_t *window, unsigned int len)
Apply symmetric window in 16-bit fixed-point.
Definition: ac3dsp.h:151
uint8_t
#define av_cold
Definition: attributes.h:82
void ff_ac3_extract_exponents_ssse3(uint8_t *exp, int32_t *coef, int nb_coefs)
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
void ff_ac3_rshift_int32_mmx(int32_t *src, unsigned int len, unsigned int shift)
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce output
void ff_ac3_lshift_int16_mmx(int16_t *src, unsigned int len, unsigned int shift)
#define DOWNMIX_FUNCS(opt)
Definition: ac3dsp_init.c:129
void ff_ac3_lshift_int16_sse2(int16_t *src, unsigned int len, unsigned int shift)
#define AV_CPU_FLAG_ATOM
Atom processor, some SSSE3 instructions are slower.
Definition: cpu.h:45
#define EXTERNAL_SSE2_FAST(flags)
Definition: cpu.h:60
#define EXTERNAL_SSE2(flags)
Definition: cpu.h:59
void ff_ac3_exponent_min_sse2(uint8_t *exp, int num_reuse_blocks, int nb_coefs)
void ff_apply_window_int16_ssse3_atom(int16_t *output, const int16_t *input, const int16_t *window, unsigned int len)
av_cold void ff_ac3dsp_init_x86(AC3DSPContext *c, int bit_exact)
Definition: ac3dsp_init.c:66
void ff_apply_window_int16_round_mmxext(int16_t *output, const int16_t *input, const int16_t *window, unsigned int len)
void ff_ac3_rshift_int32_sse2(int32_t *src, unsigned int len, unsigned int shift)
int(* ac3_max_msb_abs_int16)(const int16_t *src, int len)
Calculate the maximum MSB of the absolute value of each element in an array of int16_t.
Definition: ac3dsp.h:54
void(* ac3_lshift_int16)(int16_t *src, unsigned int len, unsigned int shift)
Left-shift each value in an array of int16_t by a specified amount.
Definition: ac3dsp.h:65
int8_t exp
Definition: eval.c:72
void(* ac3_rshift_int32)(int32_t *src, unsigned int len, unsigned int shift)
Right-shift each value in an array of int32_t by a specified amount.
Definition: ac3dsp.h:76
static SDL_Window * window
Definition: ffplay.c:367
void ff_apply_window_int16_round_sse2(int16_t *output, const int16_t *input, const int16_t *window, unsigned int len)
int ff_ac3_max_msb_abs_int16_ssse3(const int16_t *src, int len)
int32_t
void ff_apply_window_int16_sse2(int16_t *output, const int16_t *input, const int16_t *window, unsigned int len)
void ff_ac3_exponent_min_mmx(uint8_t *exp, int num_reuse_blocks, int nb_coefs)
void ff_ac3_exponent_min_mmxext(uint8_t *exp, int num_reuse_blocks, int nb_coefs)
void ff_apply_window_int16_mmxext(int16_t *output, const int16_t *input, const int16_t *window, unsigned int len)
#define AV_CPU_FLAG_AVXSLOW
AVX supported, but slow when using YMM registers (e.g. Bulldozer)
Definition: cpu.h:50
void ff_apply_window_int16_ssse3(int16_t *output, const int16_t *input, const int16_t *window, unsigned int len)
int ff_ac3_max_msb_abs_int16_mmxext(const int16_t *src, int len)
void ff_float_to_fixed24_sse(int32_t *dst, const float *src, unsigned int len)
#define EXTERNAL_SSSE3(flags)
Definition: cpu.h:65
int(* compute_mantissa_size)(uint16_t mant_cnt[6][16])
Calculate the number of bits needed to encode a set of mantissas.
Definition: ac3dsp.h:125
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some input
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:93
void(* ac3_exponent_min)(uint8_t *exp, int num_reuse_blocks, int nb_coefs)
Set each encoded exponent in a block to the minimum of itself and the exponents in the same frequency...
Definition: ac3dsp.h:43
#define EXTERNAL_MMXEXT(flags)
Definition: cpu.h:57
#define SET_DOWNMIX_ALL(suf, SUF)
int ff_ac3_compute_mantissa_size_sse2(uint16_t mant_cnt[6][16])
int len
void ff_ac3_extract_exponents_sse2(uint8_t *exp, int32_t *coef, int nb_coefs)
#define EXTERNAL_AMD3DNOW(flags)
Definition: cpu.h:54
Common code between the AC-3 encoder and decoder.
void(* float_to_fixed24)(int32_t *dst, const float *src, unsigned int len)
Convert an array of float in range [-1.0,1.0] to int32_t with range [-(1<<24),(1<<24)].
Definition: ac3dsp.h:89