Libav
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 Libav.
7  *
8  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "config.h"
24 #include "libavutil/attributes.h"
25 #include "libavutil/intfloat.h"
26 #include "sbrdsp.h"
27 
28 static void sbr_sum64x5_c(float *z)
29 {
30  int k;
31  for (k = 0; k < 64; k++) {
32  float f = z[k] + z[k + 64] + z[k + 128] + z[k + 192] + z[k + 256];
33  z[k] = f;
34  }
35 }
36 
37 static float sbr_sum_square_c(float (*x)[2], int n)
38 {
39  float sum0 = 0.0f, sum1 = 0.0f;
40  int i;
41 
42  for (i = 0; i < n; i += 2)
43  {
44  sum0 += x[i + 0][0] * x[i + 0][0];
45  sum1 += x[i + 0][1] * x[i + 0][1];
46  sum0 += x[i + 1][0] * x[i + 1][0];
47  sum1 += x[i + 1][1] * x[i + 1][1];
48  }
49 
50  return sum0 + sum1;
51 }
52 
53 static void sbr_neg_odd_64_c(float *x)
54 {
55  union av_intfloat32 *xi = (union av_intfloat32*) x;
56  int i;
57  for (i = 1; i < 64; i += 4) {
58  xi[i + 0].i ^= 1U << 31;
59  xi[i + 2].i ^= 1U << 31;
60  }
61 }
62 
63 static void sbr_qmf_pre_shuffle_c(float *z)
64 {
65  union av_intfloat32 *zi = (union av_intfloat32*) z;
66  int k;
67  zi[64].i = zi[0].i;
68  zi[65].i = zi[1].i;
69  for (k = 1; k < 31; k += 2) {
70  zi[64 + 2 * k + 0].i = zi[64 - k].i ^ (1U << 31);
71  zi[64 + 2 * k + 1].i = zi[ k + 1].i;
72  zi[64 + 2 * k + 2].i = zi[63 - k].i ^ (1U << 31);
73  zi[64 + 2 * k + 3].i = zi[ k + 2].i;
74  }
75  zi[64 + 2 * 31 + 0].i = zi[64 - 31].i ^ (1U << 31);
76  zi[64 + 2 * 31 + 1].i = zi[31 + 1].i;
77 }
78 
79 static void sbr_qmf_post_shuffle_c(float W[32][2], const float *z)
80 {
81  const union av_intfloat32 *zi = (const union av_intfloat32*) z;
82  union av_intfloat32 *Wi = (union av_intfloat32*) W;
83  int k;
84  for (k = 0; k < 32; k += 2) {
85  Wi[2 * k + 0].i = zi[63 - k].i ^ (1U << 31);
86  Wi[2 * k + 1].i = zi[ k + 0].i;
87  Wi[2 * k + 2].i = zi[62 - k].i ^ (1U << 31);
88  Wi[2 * k + 3].i = zi[ k + 1].i;
89  }
90 }
91 
92 static void sbr_qmf_deint_neg_c(float *v, const float *src)
93 {
94  const union av_intfloat32 *si = (const union av_intfloat32*)src;
95  union av_intfloat32 *vi = (union av_intfloat32*)v;
96  int i;
97  for (i = 0; i < 32; i++) {
98  vi[ i].i = si[63 - 2 * i ].i;
99  vi[63 - i].i = si[63 - 2 * i - 1].i ^ (1U << 31);
100  }
101 }
102 
103 static void sbr_qmf_deint_bfly_c(float *v, const float *src0, const float *src1)
104 {
105  int i;
106  for (i = 0; i < 64; i++) {
107  v[ i] = src0[i] - src1[63 - i];
108  v[127 - i] = src0[i] + src1[63 - i];
109  }
110 }
111 
112 static av_always_inline void autocorrelate(const float x[40][2],
113  float phi[3][2][2], int lag)
114 {
115  int i;
116  float real_sum = 0.0f;
117  float imag_sum = 0.0f;
118  if (lag) {
119  for (i = 1; i < 38; i++) {
120  real_sum += x[i][0] * x[i+lag][0] + x[i][1] * x[i+lag][1];
121  imag_sum += x[i][0] * x[i+lag][1] - x[i][1] * x[i+lag][0];
122  }
123  phi[2-lag][1][0] = real_sum + x[ 0][0] * x[lag][0] + x[ 0][1] * x[lag][1];
124  phi[2-lag][1][1] = imag_sum + x[ 0][0] * x[lag][1] - x[ 0][1] * x[lag][0];
125  if (lag == 1) {
126  phi[0][0][0] = real_sum + x[38][0] * x[39][0] + x[38][1] * x[39][1];
127  phi[0][0][1] = imag_sum + x[38][0] * x[39][1] - x[38][1] * x[39][0];
128  }
129  } else {
130  for (i = 1; i < 38; i++) {
131  real_sum += x[i][0] * x[i][0] + x[i][1] * x[i][1];
132  }
133  phi[2][1][0] = real_sum + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1];
134  phi[1][0][0] = real_sum + x[38][0] * x[38][0] + x[38][1] * x[38][1];
135  }
136 }
137 
138 static void sbr_autocorrelate_c(const float x[40][2], float phi[3][2][2])
139 {
140 #if 0
141  /* This code is slower because it multiplies memory accesses.
142  * It is left for educational purposes and because it may offer
143  * a better reference for writing arch-specific DSP functions. */
144  autocorrelate(x, phi, 0);
145  autocorrelate(x, phi, 1);
146  autocorrelate(x, phi, 2);
147 #else
148  float real_sum2 = x[0][0] * x[2][0] + x[0][1] * x[2][1];
149  float imag_sum2 = x[0][0] * x[2][1] - x[0][1] * x[2][0];
150  float real_sum1 = 0.0f, imag_sum1 = 0.0f, real_sum0 = 0.0f;
151  int i;
152  for (i = 1; i < 38; i++) {
153  real_sum0 += x[i][0] * x[i ][0] + x[i][1] * x[i ][1];
154  real_sum1 += x[i][0] * x[i + 1][0] + x[i][1] * x[i + 1][1];
155  imag_sum1 += x[i][0] * x[i + 1][1] - x[i][1] * x[i + 1][0];
156  real_sum2 += x[i][0] * x[i + 2][0] + x[i][1] * x[i + 2][1];
157  imag_sum2 += x[i][0] * x[i + 2][1] - x[i][1] * x[i + 2][0];
158  }
159  phi[2 - 2][1][0] = real_sum2;
160  phi[2 - 2][1][1] = imag_sum2;
161  phi[2 ][1][0] = real_sum0 + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1];
162  phi[1 ][0][0] = real_sum0 + x[38][0] * x[38][0] + x[38][1] * x[38][1];
163  phi[2 - 1][1][0] = real_sum1 + x[ 0][0] * x[ 1][0] + x[ 0][1] * x[ 1][1];
164  phi[2 - 1][1][1] = imag_sum1 + x[ 0][0] * x[ 1][1] - x[ 0][1] * x[ 1][0];
165  phi[0 ][0][0] = real_sum1 + x[38][0] * x[39][0] + x[38][1] * x[39][1];
166  phi[0 ][0][1] = imag_sum1 + x[38][0] * x[39][1] - x[38][1] * x[39][0];
167 #endif
168 }
169 
170 static void sbr_hf_gen_c(float (*X_high)[2], const float (*X_low)[2],
171  const float alpha0[2], const float alpha1[2],
172  float bw, int start, int end)
173 {
174  float alpha[4];
175  int i;
176 
177  alpha[0] = alpha1[0] * bw * bw;
178  alpha[1] = alpha1[1] * bw * bw;
179  alpha[2] = alpha0[0] * bw;
180  alpha[3] = alpha0[1] * bw;
181 
182  for (i = start; i < end; i++) {
183  X_high[i][0] =
184  X_low[i - 2][0] * alpha[0] -
185  X_low[i - 2][1] * alpha[1] +
186  X_low[i - 1][0] * alpha[2] -
187  X_low[i - 1][1] * alpha[3] +
188  X_low[i][0];
189  X_high[i][1] =
190  X_low[i - 2][1] * alpha[0] +
191  X_low[i - 2][0] * alpha[1] +
192  X_low[i - 1][1] * alpha[2] +
193  X_low[i - 1][0] * alpha[3] +
194  X_low[i][1];
195  }
196 }
197 
198 static void sbr_hf_g_filt_c(float (*Y)[2], const float (*X_high)[40][2],
199  const float *g_filt, int m_max, intptr_t ixh)
200 {
201  int m;
202 
203  for (m = 0; m < m_max; m++) {
204  Y[m][0] = X_high[m][ixh][0] * g_filt[m];
205  Y[m][1] = X_high[m][ixh][1] * g_filt[m];
206  }
207 }
208 
209 static av_always_inline void sbr_hf_apply_noise(float (*Y)[2],
210  const float *s_m,
211  const float *q_filt,
212  int noise,
213  float phi_sign0,
214  float phi_sign1,
215  int m_max)
216 {
217  int m;
218 
219  for (m = 0; m < m_max; m++) {
220  float y0 = Y[m][0];
221  float y1 = Y[m][1];
222  noise = (noise + 1) & 0x1ff;
223  if (s_m[m]) {
224  y0 += s_m[m] * phi_sign0;
225  y1 += s_m[m] * phi_sign1;
226  } else {
227  y0 += q_filt[m] * ff_sbr_noise_table[noise][0];
228  y1 += q_filt[m] * ff_sbr_noise_table[noise][1];
229  }
230  Y[m][0] = y0;
231  Y[m][1] = y1;
232  phi_sign1 = -phi_sign1;
233  }
234 }
235 
236 static void sbr_hf_apply_noise_0(float (*Y)[2], const float *s_m,
237  const float *q_filt, int noise,
238  int kx, int m_max)
239 {
240  sbr_hf_apply_noise(Y, s_m, q_filt, noise, 1.0, 0.0, m_max);
241 }
242 
243 static void sbr_hf_apply_noise_1(float (*Y)[2], const float *s_m,
244  const float *q_filt, int noise,
245  int kx, int m_max)
246 {
247  float phi_sign = 1 - 2 * (kx & 1);
248  sbr_hf_apply_noise(Y, s_m, q_filt, noise, 0.0, phi_sign, m_max);
249 }
250 
251 static void sbr_hf_apply_noise_2(float (*Y)[2], const float *s_m,
252  const float *q_filt, int noise,
253  int kx, int m_max)
254 {
255  sbr_hf_apply_noise(Y, s_m, q_filt, noise, -1.0, 0.0, m_max);
256 }
257 
258 static void sbr_hf_apply_noise_3(float (*Y)[2], const float *s_m,
259  const float *q_filt, int noise,
260  int kx, int m_max)
261 {
262  float phi_sign = 1 - 2 * (kx & 1);
263  sbr_hf_apply_noise(Y, s_m, q_filt, noise, 0.0, -phi_sign, m_max);
264 }
265 
267 {
268  s->sum64x5 = sbr_sum64x5_c;
276  s->hf_gen = sbr_hf_gen_c;
278 
283 
284  if (ARCH_ARM)
286  if (ARCH_X86)
288 }
#define ARCH_ARM
Definition: config.h:14
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:198
static void sbr_qmf_pre_shuffle_c(float *z)
Definition: sbrdsp.c:63
static float sbr_sum_square_c(float(*x)[2], int n)
Definition: sbrdsp.c:37
const float ff_sbr_noise_table[][2]
Definition: aacsbrdata.h:356
void(* sum64x5)(float *z)
Definition: sbrdsp.h:27
float(* sum_square)(float(*x)[2], int n)
Definition: sbrdsp.h:28
void(* qmf_deint_neg)(float *v, const float *src)
Definition: sbrdsp.h:32
#define ARCH_X86
Definition: config.h:33
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:209
Definition: vf_drawbox.c:37
static void sbr_neg_odd_64_c(float *x)
Definition: sbrdsp.c:53
av_cold void ff_sbrdsp_init_arm(SBRDSPContext *s)
Macro definitions for various function/variable attributes.
static void sbr_sum64x5_c(float *z)
Definition: sbrdsp.c:28
Definition: vf_drawbox.c:37
#define av_cold
Definition: attributes.h:66
static void sbr_hf_apply_noise_0(float(*Y)[2], const float *s_m, const float *q_filt, int noise, int kx, int m_max)
Definition: sbrdsp.c:236
static av_always_inline void autocorrelate(const float x[40][2], float phi[3][2][2], int lag)
Definition: sbrdsp.c:112
void(* qmf_deint_bfly)(float *v, const float *src0, const float *src1)
Definition: sbrdsp.h:33
static void sbr_hf_apply_noise_2(float(*Y)[2], const float *s_m, const float *q_filt, int noise, int kx, int m_max)
Definition: sbrdsp.c:251
void(* hf_apply_noise[4])(float(*Y)[2], const float *s_m, const float *q_filt, int noise, int kx, int m_max)
Definition: sbrdsp.h:40
av_cold void ff_sbrdsp_init(SBRDSPContext *s)
Definition: sbrdsp.c:266
static void sbr_hf_apply_noise_3(float(*Y)[2], const float *s_m, const float *q_filt, int noise, int kx, int m_max)
Definition: sbrdsp.c:258
uint32_t i
Definition: intfloat.h:28
void(* neg_odd_64)(float *x)
Definition: sbrdsp.h:29
static void sbr_qmf_post_shuffle_c(float W[32][2], const float *z)
Definition: sbrdsp.c:79
static void sbr_autocorrelate_c(const float x[40][2], float phi[3][2][2])
Definition: sbrdsp.c:138
static int noise(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
Definition: noise_bsf.c:28
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:170
#define W(a, i, v)
Definition: jpegls.h:121
static void sbr_qmf_deint_bfly_c(float *v, const float *src0, const float *src1)
Definition: sbrdsp.c:103
static void sbr_hf_apply_noise_1(float(*Y)[2], const float *s_m, const float *q_filt, int noise, int kx, int m_max)
Definition: sbrdsp.c:243
void ff_sbrdsp_init_x86(SBRDSPContext *s)
Definition: sbrdsp_init.c:40
static void sbr_qmf_deint_neg_c(float *v, const float *src)
Definition: sbrdsp.c:92
void(* qmf_post_shuffle)(float W[32][2], const float *z)
Definition: sbrdsp.h:31
void(* autocorrelate)(const float x[40][2], float phi[3][2][2])
Definition: sbrdsp.h:34
void(* qmf_pre_shuffle)(float *z)
Definition: sbrdsp.h:30
void(* hf_gen)(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.h:35
#define av_always_inline
Definition: attributes.h:40
void(* hf_g_filt)(float(*Y)[2], const float(*X_high)[40][2], const float *g_filt, int m_max, intptr_t ixh)
Definition: sbrdsp.h:38