source: src/temporal/filter.c @ 32d6958

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since 32d6958 was 32d6958, checked in by Paul Brossier <piem@piem.org>, 13 years ago

src/: more moving and splitting

  • Property mode set to 100644
File size: 6.5 KB
Line 
1/*
2   Copyright (C) 2003 Paul Brossier
3
4   This program is free software; you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 2 of the License, or
7   (at your option) any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program; if not, write to the Free Software
16   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17
18*/
19
20
21/* Requires lsmp_t to be long or double. float will NOT give reliable
22 * results */
23
24#include "aubio_priv.h"
25#include "sample.h"
26#include "mathutils.h"
27#include "temporal/filter.h"
28
29struct _aubio_filter_t {
30  uint_t order;
31  lsmp_t * a;
32  lsmp_t * b;
33  lsmp_t * y;
34  lsmp_t * x;
35};
36
37/* bug: mono only */
38void aubio_filter_do(aubio_filter_t * f, fvec_t * in) {
39  uint_t i,j,l, order = f->order;
40  lsmp_t *x = f->x;
41  lsmp_t *y = f->y;
42  lsmp_t *a = f->a;
43  lsmp_t *b = f->b;
44  i=0;//for (i=0;i<in->channels;i++) {
45  for (j = 0; j < in->length; j++) {
46    /* new input */
47    //AUBIO_DBG("befor %f\t", in->data[i][j]);
48    x[0] = in->data[i][j];
49    y[0] = b[0] * x[0];
50    for (l=1;l<order; l++) {
51      y[0] += b[l] * x[l];
52      y[0] -= a[l] * y[l];
53    } /* + 1e-37; for denormal ? */
54    /* new output */
55    in->data[i][j] = y[0];
56    //AUBIO_DBG("after %f\n", in->data[i][j]);
57    /* store states for next sample */
58    for (l=order-1; l>0; l--){
59      x[l] = x[l-1];
60      y[l] = y[l-1];
61    }
62  }
63  /* store states for next buffer */
64  f->x = x;
65  f->y = y;
66  //}   
67}
68
69void aubio_filter_do_outplace(aubio_filter_t * f, fvec_t * in, fvec_t * out) {
70  uint_t i,j,l, order = f->order;
71  lsmp_t *x = f->x;
72  lsmp_t *y = f->y;
73  lsmp_t *a = f->a;
74  lsmp_t *b = f->b;
75
76  i=0; // works in mono only !!!
77  //for (i=0;i<in->channels;i++) {
78  for (j = 0; j < in->length; j++) {
79    /* new input */
80    x[0] = in->data[i][j];
81    y[0] = b[0] * x[0];
82    for (l=1;l<order; l++) {
83      y[0] += b[l] * x[l];
84      y[0] -= a[l] * y[l];
85    }
86    // + 1e-37;
87    /* new output */
88    out->data[i][j] = y[0];
89    /* store for next sample */
90    for (l=order-1; l>0; l--){
91      x[l] = x[l-1];
92      y[l] = y[l-1];
93    }
94  }
95  /* store for next run */
96  f->x = x;
97  f->y = y;
98  //}
99}
100
101/* 
102 *
103 * despite mirroring, end effects destroy both phse and amplitude. the longer
104 * the buffer, the less affected they are.
105 *
106 * replacing with zeros clicks.
107 *
108 * seems broken for order > 4 (see biquad_do_filtfilt for audible one)
109 */
110void aubio_filter_do_filtfilt(aubio_filter_t * f, fvec_t * in, fvec_t * tmp) {
111  uint_t j,i=0;
112  uint_t length = in->length;
113  //uint_t order = f->order;
114  //lsmp_t mir;
115  /* mirroring */
116  //mir = 2*in->data[i][0];
117  //for (j=1;j<order;j++)
118  //f->x[j] = 0.;//mir - in->data[i][order-j];
119  /* apply filtering */
120  aubio_filter_do(f,in);
121  /* invert */
122  for (j = 0; j < length; j++)
123    tmp->data[i][length-j-1] = in->data[i][j];
124  /* mirror inverted */
125  //mir = 2*tmp->data[i][0];
126  //for (j=1;j<order;j++)
127  //f->x[j] = 0.;//mir - tmp->data[i][order-j];
128  /* apply filtering on inverted */
129  aubio_filter_do(f,tmp);
130  /* invert back */
131  for (j = 0; j < length; j++)
132    in->data[i][j] = tmp->data[i][length-j-1];
133}
134
135
136aubio_filter_t * new_aubio_adsgn_filter(uint_t samplerate) {
137  aubio_filter_t * f = new_aubio_filter(samplerate, 7);
138  lsmp_t * a = f->a;
139  lsmp_t * b = f->b;
140  /* uint_t l; */
141  /* for now, 44100, adsgn */
142  a[0] =  1.00000000000000000000000000000000000000000000000000000; 
143  a[1] = -4.01957618111583236952810693765059113502502441406250000; 
144  a[2] =  6.18940644292069386267485242569819092750549316406250000; 
145  a[3] = -4.45319890354411640487342083360999822616577148437500000; 
146  a[4] =  1.42084294962187751565352300531230866909027099609375000; 
147  a[5] = -0.14182547383030480458998567883099894970655441284179688; 
148  a[6] =  0.00435117723349511334451911181986361043527722358703613; 
149  b[0] =  0.25574112520425740235907596797915175557136535644531250;
150  b[1] = -0.51148225040851391653973223583307117223739624023437500;
151  b[2] = -0.25574112520426162120656954357400536537170410156250000;
152  b[3] =  1.02296450081703405032840237254276871681213378906250000;
153  b[4] = -0.25574112520426051098354491841746494174003601074218750;
154  b[5] = -0.51148225040851369449512731080176308751106262207031250;
155  b[6] =  0.25574112520425729133677350546349771320819854736328125;
156  /* DBG: filter coeffs at creation time */
157  /*
158  for (l=0; l<f->order; l++){
159    AUBIO_DBG("a[%d]=\t%1.16f\tb[%d]=\t%1.16f\n",l,a[l],l,b[l]);
160  }
161  */
162  f->a = a;
163  f->b = b;
164  return f;
165}
166
167aubio_filter_t * new_aubio_cdsgn_filter(uint_t samplerate) {
168  aubio_filter_t * f = new_aubio_filter(samplerate, 5);
169  lsmp_t * a = f->a;
170  lsmp_t * b = f->b;
171  /* uint_t l; */
172  /* for now, 44100, cdsgn */
173  a[0] =  1.000000000000000000000000000000000000000000000000000000000000; 
174  a[1] = -2.134674963687040794013682898366823792457580566406250000000000; 
175  a[2] =  1.279333533236063358273781886964570730924606323242187500000000; 
176  a[3] = -0.149559846089396208945743182994192466139793395996093750000000; 
177  a[4] =  0.004908700174624848651394604104325480875559151172637939453125; 
178  b[0] =  0.217008561949218803377448239189106971025466918945312500000000;
179  b[1] = -0.000000000000000222044604925031308084726333618164062500000000;
180  b[2] = -0.434017123898438272888711253472138196229934692382812500000000;
181  b[3] =  0.000000000000000402455846426619245903566479682922363281250000;
182  b[4] =  0.217008561949218969910901932962588034570217132568359375000000;
183  /* DBG: filter coeffs at creation time */
184  /*
185  for (l=0; l<f->order; l++){
186    AUBIO_DBG("a[%d]=\t%1.16f\tb[%d]=\t%1.16f\n",l,a[l],l,b[l]);
187  }
188  */
189  f->a = a;
190  f->b = b;
191  return f;
192}
193
194aubio_filter_t * new_aubio_filter(uint_t samplerate UNUSED, uint_t order) {
195  aubio_filter_t * f = AUBIO_NEW(aubio_filter_t);
196  lsmp_t * x = f->x;
197  lsmp_t * y = f->y;
198  lsmp_t * a = f->a;
199  lsmp_t * b = f->b;
200  uint_t l;
201  f->order = order;
202  a = AUBIO_ARRAY(lsmp_t,f->order);
203  b = AUBIO_ARRAY(lsmp_t,f->order);
204  x = AUBIO_ARRAY(lsmp_t,f->order);
205  y = AUBIO_ARRAY(lsmp_t,f->order);
206  /* initial states to zeros */
207  for (l=0; l<f->order; l++){
208    x[l] = 0.;
209    y[l] = 0.;
210  }
211  f->x = x;
212  f->y = y;
213  f->a = a;
214  f->b = b;
215  return f;
216}
217
218void del_aubio_filter(aubio_filter_t * f) {
219  AUBIO_FREE(f->a);
220  AUBIO_FREE(f->b);
221  AUBIO_FREE(f->x);
222  AUBIO_FREE(f->y);
223  AUBIO_FREE(f);
224  return;
225}
Note: See TracBrowser for help on using the repository browser.