2
* Copyright (C) 2004-2012 Savoir-Faire Linux Inc.
3
* Author: Alexandre Savard <alexandre.savard@savoirfairelinux.com>
5
* This program is free software; you can redistribute it and/or modify
6
* it under the terms of the GNU General Public License as published by
7
* the Free Software Foundation; either version 3 of the License, or
8
* (at your option) any later version.
10
* This program is distributed in the hope that it will be useful,
11
* but WITHOUT ANY WARRANTY; without even the implied warranty of
12
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13
* GNU General Public License for more details.
15
* You should have received a copy of the GNU General Public License
16
* along with this program; if not, write to the Free Software
17
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19
* Additional permission under GNU GPL version 3 section 7:
21
* If you modify this program, or any covered work, by linking or
22
* combining it with the OpenSSL project's OpenSSL library (or a
23
* modified version of that library), containing parts covered by the
24
* terms of the OpenSSL or SSLeay licenses, Savoir-Faire Linux Inc.
25
* grants you additional permission to convey the resulting work.
26
* Corresponding Source for a non-source form of such a combination
27
* shall include the source code for the parts of OpenSSL used as well
28
* as that of the covered work.
32
#ifndef DELAYDETECTION_H
33
#define DELAYDETECTION_H
35
#include "sfl_types.h"
38
// Template size in samples for correlation
39
#define WINDOW_SIZE 256
41
// Segment length in ms for correlation
44
// Size of internal buffers in samples
45
#define DELAY_BUFF_SIZE MAX_DELAY * 8000 / 1000
47
#define MAXFILTERSIZE 100
52
FirFilter(const std::vector<double> &ir);
54
* Perform filtering on one sample
56
float getOutputSample(float inputSample);
63
* Length of the filter
68
* Coefficient of the filter
70
std::vector<double> impulseResponse_;
75
double taps_[MAXFILTERSIZE];
80
class DelayDetection {
87
void putData(SFLDataFormat *inputData, int samples);
89
void process(SFLDataFormat *inputData, int samples);
101
* Perform a normalized crosscorrelation between template and segment
103
void crossCorrelate(float *ref, float *seg, float *res, int refSize, int segSize);
106
* Perform a correlation on specified signals (mac)
108
double correlate(float *sig1, float *sig2, short size);
110
void convertInt16ToFloat32(SFLDataFormat *input, float *ouput, int nbSamples);
112
void downsampleData(float *input, float *output, int nbSamples, int factor);
114
void bandpassFilter(float *input, int nbSamples);
116
static int getMaxIndex(float *data, int size);
118
State internalState_;
120
FirFilter decimationFilter_;
122
FirFilter bandpassFilter_;
125
* Segment size in samples for correlation
129
int downsamplingFactor_;
131
float spkrReference_[WINDOW_SIZE*2];
133
float capturedData_[DELAY_BUFF_SIZE*2];
135
float spkrReferenceDown_[WINDOW_SIZE*2];
137
float captureDataDown_[DELAY_BUFF_SIZE*2];
139
float spkrReferenceFilter_[WINDOW_SIZE*2];
141
float captureDataFilter_[DELAY_BUFF_SIZE*2];
143
float correlationResult_[DELAY_BUFF_SIZE*2];
149
int nbMicSampleStored_;
151
int nbSpkrSampleStored_;
155
friend class DelayDetectionTest;