1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/*
* AAC Spectral Band Replication decoding functions
* Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
* Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define USE_FIXED 0
#include "aac.h"
#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/intfloat.h"
#include "sbrdsp.h"
static float sbr_sum_square_c(float (*x)[2], int n)
{
float sum0 = 0.0f, sum1 = 0.0f;
int i;
for (i = 0; i < n; i += 2)
{
sum0 += x[i + 0][0] * x[i + 0][0];
sum1 += x[i + 0][1] * x[i + 0][1];
sum0 += x[i + 1][0] * x[i + 1][0];
sum1 += x[i + 1][1] * x[i + 1][1];
}
return sum0 + sum1;
}
static void sbr_neg_odd_64_c(float *x)
{
union av_intfloat32 *xi = (union av_intfloat32*) x;
int i;
for (i = 1; i < 64; i += 4) {
xi[i + 0].i ^= 1U << 31;
xi[i + 2].i ^= 1U << 31;
}
}
static void sbr_qmf_pre_shuffle_c(float *z)
{
union av_intfloat32 *zi = (union av_intfloat32*) z;
int k;
zi[64].i = zi[0].i;
zi[65].i = zi[1].i;
for (k = 1; k < 31; k += 2) {
zi[64 + 2 * k + 0].i = zi[64 - k].i ^ (1U << 31);
zi[64 + 2 * k + 1].i = zi[ k + 1].i;
zi[64 + 2 * k + 2].i = zi[63 - k].i ^ (1U << 31);
zi[64 + 2 * k + 3].i = zi[ k + 2].i;
}
zi[64 + 2 * 31 + 0].i = zi[64 - 31].i ^ (1U << 31);
zi[64 + 2 * 31 + 1].i = zi[31 + 1].i;
}
static void sbr_qmf_post_shuffle_c(float W[32][2], const float *z)
{
const union av_intfloat32 *zi = (const union av_intfloat32*) z;
union av_intfloat32 *Wi = (union av_intfloat32*) W;
int k;
for (k = 0; k < 32; k += 2) {
Wi[2 * k + 0].i = zi[63 - k].i ^ (1U << 31);
Wi[2 * k + 1].i = zi[ k + 0].i;
Wi[2 * k + 2].i = zi[62 - k].i ^ (1U << 31);
Wi[2 * k + 3].i = zi[ k + 1].i;
}
}
static void sbr_qmf_deint_neg_c(float *v, const float *src)
{
const union av_intfloat32 *si = (const union av_intfloat32*)src;
union av_intfloat32 *vi = (union av_intfloat32*)v;
int i;
for (i = 0; i < 32; i++) {
vi[ i].i = si[63 - 2 * i ].i;
vi[63 - i].i = si[63 - 2 * i - 1].i ^ (1U << 31);
}
}
#if 0
/* This code is slower because it multiplies memory accesses.
* It is left for educational purposes and because it may offer
* a better reference for writing arch-specific DSP functions. */
static av_always_inline void autocorrelate(const float x[40][2],
float phi[3][2][2], int lag)
{
int i;
float real_sum = 0.0f;
float imag_sum = 0.0f;
if (lag) {
for (i = 1; i < 38; i++) {
real_sum += x[i][0] * x[i+lag][0] + x[i][1] * x[i+lag][1];
imag_sum += x[i][0] * x[i+lag][1] - x[i][1] * x[i+lag][0];
}
phi[2-lag][1][0] = real_sum + x[ 0][0] * x[lag][0] + x[ 0][1] * x[lag][1];
phi[2-lag][1][1] = imag_sum + x[ 0][0] * x[lag][1] - x[ 0][1] * x[lag][0];
if (lag == 1) {
phi[0][0][0] = real_sum + x[38][0] * x[39][0] + x[38][1] * x[39][1];
phi[0][0][1] = imag_sum + x[38][0] * x[39][1] - x[38][1] * x[39][0];
}
} else {
for (i = 1; i < 38; i++) {
real_sum += x[i][0] * x[i][0] + x[i][1] * x[i][1];
}
phi[2][1][0] = real_sum + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1];
phi[1][0][0] = real_sum + x[38][0] * x[38][0] + x[38][1] * x[38][1];
}
}
static void sbr_autocorrelate_c(const float x[40][2], float phi[3][2][2])
{
autocorrelate(x, phi, 0);
autocorrelate(x, phi, 1);
autocorrelate(x, phi, 2);
}
#else
static void sbr_autocorrelate_c(const float x[40][2], float phi[3][2][2])
{
float real_sum2 = x[0][0] * x[2][0] + x[0][1] * x[2][1];
float imag_sum2 = x[0][0] * x[2][1] - x[0][1] * x[2][0];
float real_sum1 = 0.0f, imag_sum1 = 0.0f, real_sum0 = 0.0f;
int i;
for (i = 1; i < 38; i++) {
real_sum0 += x[i][0] * x[i ][0] + x[i][1] * x[i ][1];
real_sum1 += x[i][0] * x[i + 1][0] + x[i][1] * x[i + 1][1];
imag_sum1 += x[i][0] * x[i + 1][1] - x[i][1] * x[i + 1][0];
real_sum2 += x[i][0] * x[i + 2][0] + x[i][1] * x[i + 2][1];
imag_sum2 += x[i][0] * x[i + 2][1] - x[i][1] * x[i + 2][0];
}
phi[2 - 2][1][0] = real_sum2;
phi[2 - 2][1][1] = imag_sum2;
phi[2 ][1][0] = real_sum0 + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1];
phi[1 ][0][0] = real_sum0 + x[38][0] * x[38][0] + x[38][1] * x[38][1];
phi[2 - 1][1][0] = real_sum1 + x[ 0][0] * x[ 1][0] + x[ 0][1] * x[ 1][1];
phi[2 - 1][1][1] = imag_sum1 + x[ 0][0] * x[ 1][1] - x[ 0][1] * x[ 1][0];
phi[0 ][0][0] = real_sum1 + x[38][0] * x[39][0] + x[38][1] * x[39][1];
phi[0 ][0][1] = imag_sum1 + x[38][0] * x[39][1] - x[38][1] * x[39][0];
#endif
}
static void sbr_hf_gen_c(float (*X_high)[2], const float (*X_low)[2],
const float alpha0[2], const float alpha1[2],
float bw, int start, int end)
{
float alpha[4];
int i;
alpha[0] = alpha1[0] * bw * bw;
alpha[1] = alpha1[1] * bw * bw;
alpha[2] = alpha0[0] * bw;
alpha[3] = alpha0[1] * bw;
for (i = start; i < end; i++) {
X_high[i][0] =
X_low[i - 2][0] * alpha[0] -
X_low[i - 2][1] * alpha[1] +
X_low[i - 1][0] * alpha[2] -
X_low[i - 1][1] * alpha[3] +
X_low[i][0];
X_high[i][1] =
X_low[i - 2][1] * alpha[0] +
X_low[i - 2][0] * alpha[1] +
X_low[i - 1][1] * alpha[2] +
X_low[i - 1][0] * alpha[3] +
X_low[i][1];
}
}
static void sbr_hf_g_filt_c(float (*Y)[2], const float (*X_high)[40][2],
const float *g_filt, int m_max, intptr_t ixh)
{
int m;
for (m = 0; m < m_max; m++) {
Y[m][0] = X_high[m][ixh][0] * g_filt[m];
Y[m][1] = X_high[m][ixh][1] * g_filt[m];
}
}
static av_always_inline void sbr_hf_apply_noise(float (*Y)[2],
const float *s_m,
const float *q_filt,
int noise,
float phi_sign0,
float phi_sign1,
int m_max)
{
int m;
for (m = 0; m < m_max; m++) {
float y0 = Y[m][0];
float y1 = Y[m][1];
noise = (noise + 1) & 0x1ff;
if (s_m[m]) {
y0 += s_m[m] * phi_sign0;
y1 += s_m[m] * phi_sign1;
} else {
y0 += q_filt[m] * ff_sbr_noise_table[noise][0];
y1 += q_filt[m] * ff_sbr_noise_table[noise][1];
}
Y[m][0] = y0;
Y[m][1] = y1;
phi_sign1 = -phi_sign1;
}
}
#include "sbrdsp_template.c"
|
