FFmpeg
sbrdsp.c
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1 /*
2  * AAC Spectral Band Replication decoding functions
3  * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
4  * Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #define USE_FIXED 0
24 
25 #include "aac.h"
26 #include "libavutil/attributes.h"
27 #include "libavutil/intfloat.h"
28 #include "sbrdsp.h"
29 
30 static float sbr_sum_square_c(float (*x)[2], int n)
31 {
32  float sum0 = 0.0f, sum1 = 0.0f;
33  int i;
34 
35  for (i = 0; i < n; i += 2)
36  {
37  sum0 += x[i + 0][0] * x[i + 0][0];
38  sum1 += x[i + 0][1] * x[i + 0][1];
39  sum0 += x[i + 1][0] * x[i + 1][0];
40  sum1 += x[i + 1][1] * x[i + 1][1];
41  }
42 
43  return sum0 + sum1;
44 }
45 
46 static void sbr_neg_odd_64_c(float *x)
47 {
48  union av_intfloat32 *xi = (union av_intfloat32*) x;
49  int i;
50  for (i = 1; i < 64; i += 4) {
51  xi[i + 0].i ^= 1U << 31;
52  xi[i + 2].i ^= 1U << 31;
53  }
54 }
55 
56 static void sbr_qmf_pre_shuffle_c(float *z)
57 {
58  union av_intfloat32 *zi = (union av_intfloat32*) z;
59  int k;
60  zi[64].i = zi[0].i;
61  zi[65].i = zi[1].i;
62  for (k = 1; k < 31; k += 2) {
63  zi[64 + 2 * k + 0].i = zi[64 - k].i ^ (1U << 31);
64  zi[64 + 2 * k + 1].i = zi[ k + 1].i;
65  zi[64 + 2 * k + 2].i = zi[63 - k].i ^ (1U << 31);
66  zi[64 + 2 * k + 3].i = zi[ k + 2].i;
67  }
68 
69  zi[64 + 2 * 31 + 0].i = zi[64 - 31].i ^ (1U << 31);
70  zi[64 + 2 * 31 + 1].i = zi[31 + 1].i;
71 }
72 
73 static void sbr_qmf_post_shuffle_c(float W[32][2], const float *z)
74 {
75  const union av_intfloat32 *zi = (const union av_intfloat32*) z;
76  union av_intfloat32 *Wi = (union av_intfloat32*) W;
77  int k;
78  for (k = 0; k < 32; k += 2) {
79  Wi[2 * k + 0].i = zi[63 - k].i ^ (1U << 31);
80  Wi[2 * k + 1].i = zi[ k + 0].i;
81  Wi[2 * k + 2].i = zi[62 - k].i ^ (1U << 31);
82  Wi[2 * k + 3].i = zi[ k + 1].i;
83  }
84 }
85 
86 static void sbr_qmf_deint_neg_c(float *v, const float *src)
87 {
88  const union av_intfloat32 *si = (const union av_intfloat32*)src;
89  union av_intfloat32 *vi = (union av_intfloat32*)v;
90  int i;
91  for (i = 0; i < 32; i++) {
92  vi[ i].i = si[63 - 2 * i ].i;
93  vi[63 - i].i = si[63 - 2 * i - 1].i ^ (1U << 31);
94  }
95 }
96 
97 #if 0
98  /* This code is slower because it multiplies memory accesses.
99  * It is left for educational purposes and because it may offer
100  * a better reference for writing arch-specific DSP functions. */
101 static av_always_inline void autocorrelate(const float x[40][2],
102  float phi[3][2][2], int lag)
103 {
104  int i;
105  float real_sum = 0.0f;
106  float imag_sum = 0.0f;
107  if (lag) {
108  for (i = 1; i < 38; i++) {
109  real_sum += x[i][0] * x[i+lag][0] + x[i][1] * x[i+lag][1];
110  imag_sum += x[i][0] * x[i+lag][1] - x[i][1] * x[i+lag][0];
111  }
112  phi[2-lag][1][0] = real_sum + x[ 0][0] * x[lag][0] + x[ 0][1] * x[lag][1];
113  phi[2-lag][1][1] = imag_sum + x[ 0][0] * x[lag][1] - x[ 0][1] * x[lag][0];
114  if (lag == 1) {
115  phi[0][0][0] = real_sum + x[38][0] * x[39][0] + x[38][1] * x[39][1];
116  phi[0][0][1] = imag_sum + x[38][0] * x[39][1] - x[38][1] * x[39][0];
117  }
118  } else {
119  for (i = 1; i < 38; i++) {
120  real_sum += x[i][0] * x[i][0] + x[i][1] * x[i][1];
121  }
122  phi[2][1][0] = real_sum + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1];
123  phi[1][0][0] = real_sum + x[38][0] * x[38][0] + x[38][1] * x[38][1];
124  }
125 }
126 
127 static void sbr_autocorrelate_c(const float x[40][2], float phi[3][2][2])
128 {
129  autocorrelate(x, phi, 0);
130  autocorrelate(x, phi, 1);
131  autocorrelate(x, phi, 2);
132 }
133 #else
134 static void sbr_autocorrelate_c(const float x[40][2], float phi[3][2][2])
135 {
136  float real_sum2 = x[0][0] * x[2][0] + x[0][1] * x[2][1];
137  float imag_sum2 = x[0][0] * x[2][1] - x[0][1] * x[2][0];
138  float real_sum1 = 0.0f, imag_sum1 = 0.0f, real_sum0 = 0.0f;
139  int i;
140  for (i = 1; i < 38; i++) {
141  real_sum0 += x[i][0] * x[i ][0] + x[i][1] * x[i ][1];
142  real_sum1 += x[i][0] * x[i + 1][0] + x[i][1] * x[i + 1][1];
143  imag_sum1 += x[i][0] * x[i + 1][1] - x[i][1] * x[i + 1][0];
144  real_sum2 += x[i][0] * x[i + 2][0] + x[i][1] * x[i + 2][1];
145  imag_sum2 += x[i][0] * x[i + 2][1] - x[i][1] * x[i + 2][0];
146  }
147  phi[2 - 2][1][0] = real_sum2;
148  phi[2 - 2][1][1] = imag_sum2;
149  phi[2 ][1][0] = real_sum0 + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1];
150  phi[1 ][0][0] = real_sum0 + x[38][0] * x[38][0] + x[38][1] * x[38][1];
151  phi[2 - 1][1][0] = real_sum1 + x[ 0][0] * x[ 1][0] + x[ 0][1] * x[ 1][1];
152  phi[2 - 1][1][1] = imag_sum1 + x[ 0][0] * x[ 1][1] - x[ 0][1] * x[ 1][0];
153  phi[0 ][0][0] = real_sum1 + x[38][0] * x[39][0] + x[38][1] * x[39][1];
154  phi[0 ][0][1] = imag_sum1 + x[38][0] * x[39][1] - x[38][1] * x[39][0];
155 }
156 #endif
157 
158 static void sbr_hf_gen_c(float (*X_high)[2], const float (*X_low)[2],
159  const float alpha0[2], const float alpha1[2],
160  float bw, int start, int end)
161 {
162  float alpha[4];
163  int i;
164 
165  alpha[0] = alpha1[0] * bw * bw;
166  alpha[1] = alpha1[1] * bw * bw;
167  alpha[2] = alpha0[0] * bw;
168  alpha[3] = alpha0[1] * bw;
169 
170  for (i = start; i < end; i++) {
171  X_high[i][0] =
172  X_low[i - 2][0] * alpha[0] -
173  X_low[i - 2][1] * alpha[1] +
174  X_low[i - 1][0] * alpha[2] -
175  X_low[i - 1][1] * alpha[3] +
176  X_low[i][0];
177  X_high[i][1] =
178  X_low[i - 2][1] * alpha[0] +
179  X_low[i - 2][0] * alpha[1] +
180  X_low[i - 1][1] * alpha[2] +
181  X_low[i - 1][0] * alpha[3] +
182  X_low[i][1];
183  }
184 }
185 
186 static void sbr_hf_g_filt_c(float (*Y)[2], const float (*X_high)[40][2],
187  const float *g_filt, int m_max, intptr_t ixh)
188 {
189  int m;
190 
191  for (m = 0; m < m_max; m++) {
192  Y[m][0] = X_high[m][ixh][0] * g_filt[m];
193  Y[m][1] = X_high[m][ixh][1] * g_filt[m];
194  }
195 }
196 
197 static av_always_inline void sbr_hf_apply_noise(float (*Y)[2],
198  const float *s_m,
199  const float *q_filt,
200  int noise,
201  float phi_sign0,
202  float phi_sign1,
203  int m_max)
204 {
205  int m;
206 
207  for (m = 0; m < m_max; m++) {
208  float y0 = Y[m][0];
209  float y1 = Y[m][1];
210  noise = (noise + 1) & 0x1ff;
211  if (s_m[m]) {
212  y0 += s_m[m] * phi_sign0;
213  y1 += s_m[m] * phi_sign1;
214  } else {
215  y0 += q_filt[m] * ff_sbr_noise_table[noise][0];
216  y1 += q_filt[m] * ff_sbr_noise_table[noise][1];
217  }
218  Y[m][0] = y0;
219  Y[m][1] = y1;
220  phi_sign1 = -phi_sign1;
221  }
222 }
223 
224 #include "sbrdsp_template.c"
av_intfloat32::i
uint32_t i
Definition: intfloat.h:28
intfloat.h
autocorrelate
static av_always_inline void autocorrelate(const int x[40][2], SoftFloat phi[3][2][2], int lag)
Definition: sbrdsp_fixed.c:145
sbr_hf_gen_c
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)
Definition: sbrdsp.c:158
xi
#define xi(width, name, var, range_min, range_max, subs,...)
Definition: cbs_h2645.c:402
W
@ W
Definition: vf_addroi.c:26
sbr_qmf_pre_shuffle_c
static void sbr_qmf_pre_shuffle_c(float *z)
Definition: sbrdsp.c:56
aac.h
av_intfloat32
Definition: intfloat.h:27
sbr_qmf_deint_neg_c
static void sbr_qmf_deint_neg_c(float *v, const float *src)
Definition: sbrdsp.c:86
ff_sbr_noise_table
const INTFLOAT ff_sbr_noise_table[][2]
window coefficients for analysis/synthesis QMF banks
Definition: aacsbrdata.h:271
sbr_hf_apply_noise
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)
Definition: sbrdsp.c:197
sbrdsp.h
sbr_sum_square_c
static float sbr_sum_square_c(float(*x)[2], int n)
Definition: sbrdsp.c:30
attributes.h
sbr_autocorrelate_c
static void sbr_autocorrelate_c(const float x[40][2], float phi[3][2][2])
Definition: sbrdsp.c:134
Y
#define Y
Definition: boxblur.h:37
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
av_always_inline
#define av_always_inline
Definition: attributes.h:49
sbr_qmf_post_shuffle_c
static void sbr_qmf_post_shuffle_c(float W[32][2], const float *z)
Definition: sbrdsp.c:73
sbr_hf_g_filt_c
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)
Definition: sbrdsp.c:186
U
#define U(x)
Definition: vpx_arith.h:37
noise
static int noise(AVBSFContext *ctx, AVPacket *pkt)
Definition: noise_bsf.c:120
alpha
static const int16_t alpha[]
Definition: ilbcdata.h:55
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
sbrdsp_template.c
sbr_neg_odd_64_c
static void sbr_neg_odd_64_c(float *x)
Definition: sbrdsp.c:46