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aacps_tablegen.h
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1 /*
2  * Header file for hardcoded Parametric Stereo tables
3  *
4  * Copyright (c) 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 #ifndef AACPS_TABLEGEN_H
24 #define AACPS_TABLEGEN_H
25 
26 #include <math.h>
27 #include <stdint.h>
28 
29 #if CONFIG_HARDCODED_TABLES
30 #define ps_tableinit()
31 #include "libavcodec/aacps_tables.h"
32 #else
33 #include "libavutil/common.h"
34 #include "libavutil/libm.h"
35 #include "libavutil/mathematics.h"
36 #include "libavutil/mem.h"
37 #define NR_ALLPASS_BANDS20 30
38 #define NR_ALLPASS_BANDS34 50
39 #define PS_AP_LINKS 3
40 static float pd_re_smooth[8*8*8];
41 static float pd_im_smooth[8*8*8];
42 static float HA[46][8][4];
43 static float HB[46][8][4];
44 static DECLARE_ALIGNED(16, float, f20_0_8) [ 8][8][2];
45 static DECLARE_ALIGNED(16, float, f34_0_12)[12][8][2];
46 static DECLARE_ALIGNED(16, float, f34_1_8) [ 8][8][2];
47 static DECLARE_ALIGNED(16, float, f34_2_4) [ 4][8][2];
48 static DECLARE_ALIGNED(16, float, Q_fract_allpass)[2][50][3][2];
49 static DECLARE_ALIGNED(16, float, phi_fract)[2][50][2];
50 
51 static const float g0_Q8[] = {
52  0.00746082949812f, 0.02270420949825f, 0.04546865930473f, 0.07266113929591f,
53  0.09885108575264f, 0.11793710567217f, 0.125f
54 };
55 
56 static const float g0_Q12[] = {
57  0.04081179924692f, 0.03812810994926f, 0.05144908135699f, 0.06399831151592f,
58  0.07428313801106f, 0.08100347892914f, 0.08333333333333f
59 };
60 
61 static const float g1_Q8[] = {
62  0.01565675600122f, 0.03752716391991f, 0.05417891378782f, 0.08417044116767f,
63  0.10307344158036f, 0.12222452249753f, 0.125f
64 };
65 
66 static const float g2_Q4[] = {
67  -0.05908211155639f, -0.04871498374946f, 0.0f, 0.07778723915851f,
68  0.16486303567403f, 0.23279856662996f, 0.25f
69 };
70 
71 static void make_filters_from_proto(float (*filter)[8][2], const float *proto, int bands)
72 {
73  int q, n;
74  for (q = 0; q < bands; q++) {
75  for (n = 0; n < 7; n++) {
76  double theta = 2 * M_PI * (q + 0.5) * (n - 6) / bands;
77  filter[q][n][0] = proto[n] * cos(theta);
78  filter[q][n][1] = proto[n] * -sin(theta);
79  }
80  }
81 }
82 
83 static void ps_tableinit(void)
84 {
85  static const float ipdopd_sin[] = { 0, M_SQRT1_2, 1, M_SQRT1_2, 0, -M_SQRT1_2, -1, -M_SQRT1_2 };
86  static const float ipdopd_cos[] = { 1, M_SQRT1_2, 0, -M_SQRT1_2, -1, -M_SQRT1_2, 0, M_SQRT1_2 };
87  int pd0, pd1, pd2;
88 
89  static const float iid_par_dequant[] = {
90  //iid_par_dequant_default
91  0.05623413251903, 0.12589254117942, 0.19952623149689, 0.31622776601684,
92  0.44668359215096, 0.63095734448019, 0.79432823472428, 1,
93  1.25892541179417, 1.58489319246111, 2.23872113856834, 3.16227766016838,
94  5.01187233627272, 7.94328234724282, 17.7827941003892,
95  //iid_par_dequant_fine
96  0.00316227766017, 0.00562341325190, 0.01, 0.01778279410039,
97  0.03162277660168, 0.05623413251903, 0.07943282347243, 0.11220184543020,
98  0.15848931924611, 0.22387211385683, 0.31622776601684, 0.39810717055350,
99  0.50118723362727, 0.63095734448019, 0.79432823472428, 1,
100  1.25892541179417, 1.58489319246111, 1.99526231496888, 2.51188643150958,
101  3.16227766016838, 4.46683592150963, 6.30957344480193, 8.91250938133745,
102  12.5892541179417, 17.7827941003892, 31.6227766016838, 56.2341325190349,
103  100, 177.827941003892, 316.227766016837,
104  };
105  static const float icc_invq[] = {
106  1, 0.937, 0.84118, 0.60092, 0.36764, 0, -0.589, -1
107  };
108  static const float acos_icc_invq[] = {
109  0, 0.35685527, 0.57133466, 0.92614472, 1.1943263, M_PI/2, 2.2006171, M_PI
110  };
111  int iid, icc;
112 
113  int k, m;
114  static const int8_t f_center_20[] = {
115  -3, -1, 1, 3, 5, 7, 10, 14, 18, 22,
116  };
117  static const int8_t f_center_34[] = {
118  2, 6, 10, 14, 18, 22, 26, 30,
119  34,-10, -6, -2, 51, 57, 15, 21,
120  27, 33, 39, 45, 54, 66, 78, 42,
121  102, 66, 78, 90,102,114,126, 90,
122  };
123  static const float fractional_delay_links[] = { 0.43f, 0.75f, 0.347f };
124  const float fractional_delay_gain = 0.39f;
125 
126  for (pd0 = 0; pd0 < 8; pd0++) {
127  float pd0_re = ipdopd_cos[pd0];
128  float pd0_im = ipdopd_sin[pd0];
129  for (pd1 = 0; pd1 < 8; pd1++) {
130  float pd1_re = ipdopd_cos[pd1];
131  float pd1_im = ipdopd_sin[pd1];
132  for (pd2 = 0; pd2 < 8; pd2++) {
133  float pd2_re = ipdopd_cos[pd2];
134  float pd2_im = ipdopd_sin[pd2];
135  float re_smooth = 0.25f * pd0_re + 0.5f * pd1_re + pd2_re;
136  float im_smooth = 0.25f * pd0_im + 0.5f * pd1_im + pd2_im;
137  float pd_mag = 1 / sqrt(im_smooth * im_smooth + re_smooth * re_smooth);
138  pd_re_smooth[pd0*64+pd1*8+pd2] = re_smooth * pd_mag;
139  pd_im_smooth[pd0*64+pd1*8+pd2] = im_smooth * pd_mag;
140  }
141  }
142  }
143 
144  for (iid = 0; iid < 46; iid++) {
145  float c = iid_par_dequant[iid]; ///< Linear Inter-channel Intensity Difference
146  float c1 = (float)M_SQRT2 / sqrtf(1.0f + c*c);
147  float c2 = c * c1;
148  for (icc = 0; icc < 8; icc++) {
149  /*if (PS_BASELINE || ps->icc_mode < 3)*/ {
150  float alpha = 0.5f * acos_icc_invq[icc];
151  float beta = alpha * (c1 - c2) * (float)M_SQRT1_2;
152  HA[iid][icc][0] = c2 * cosf(beta + alpha);
153  HA[iid][icc][1] = c1 * cosf(beta - alpha);
154  HA[iid][icc][2] = c2 * sinf(beta + alpha);
155  HA[iid][icc][3] = c1 * sinf(beta - alpha);
156  } /* else */ {
157  float alpha, gamma, mu, rho;
158  float alpha_c, alpha_s, gamma_c, gamma_s;
159  rho = FFMAX(icc_invq[icc], 0.05f);
160  alpha = 0.5f * atan2f(2.0f * c * rho, c*c - 1.0f);
161  mu = c + 1.0f / c;
162  mu = sqrtf(1 + (4 * rho * rho - 4)/(mu * mu));
163  gamma = atanf(sqrtf((1.0f - mu)/(1.0f + mu)));
164  if (alpha < 0) alpha += M_PI/2;
165  alpha_c = cosf(alpha);
166  alpha_s = sinf(alpha);
167  gamma_c = cosf(gamma);
168  gamma_s = sinf(gamma);
169  HB[iid][icc][0] = M_SQRT2 * alpha_c * gamma_c;
170  HB[iid][icc][1] = M_SQRT2 * alpha_s * gamma_c;
171  HB[iid][icc][2] = -M_SQRT2 * alpha_s * gamma_s;
172  HB[iid][icc][3] = M_SQRT2 * alpha_c * gamma_s;
173  }
174  }
175  }
176 
177  for (k = 0; k < NR_ALLPASS_BANDS20; k++) {
178  double f_center, theta;
179  if (k < FF_ARRAY_ELEMS(f_center_20))
180  f_center = f_center_20[k] * 0.125;
181  else
182  f_center = k - 6.5f;
183  for (m = 0; m < PS_AP_LINKS; m++) {
184  theta = -M_PI * fractional_delay_links[m] * f_center;
185  Q_fract_allpass[0][k][m][0] = cos(theta);
186  Q_fract_allpass[0][k][m][1] = sin(theta);
187  }
188  theta = -M_PI*fractional_delay_gain*f_center;
189  phi_fract[0][k][0] = cos(theta);
190  phi_fract[0][k][1] = sin(theta);
191  }
192  for (k = 0; k < NR_ALLPASS_BANDS34; k++) {
193  double f_center, theta;
194  if (k < FF_ARRAY_ELEMS(f_center_34))
195  f_center = f_center_34[k] / 24.0;
196  else
197  f_center = k - 26.5f;
198  for (m = 0; m < PS_AP_LINKS; m++) {
199  theta = -M_PI * fractional_delay_links[m] * f_center;
200  Q_fract_allpass[1][k][m][0] = cos(theta);
201  Q_fract_allpass[1][k][m][1] = sin(theta);
202  }
203  theta = -M_PI*fractional_delay_gain*f_center;
204  phi_fract[1][k][0] = cos(theta);
205  phi_fract[1][k][1] = sin(theta);
206  }
207 
208  make_filters_from_proto(f20_0_8, g0_Q8, 8);
209  make_filters_from_proto(f34_0_12, g0_Q12, 12);
210  make_filters_from_proto(f34_1_8, g1_Q8, 8);
211  make_filters_from_proto(f34_2_4, g2_Q4, 4);
212 }
213 #endif /* CONFIG_HARDCODED_TABLES */
214 
215 #endif /* AACPS_TABLEGEN_H */
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