1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
/*
* Copyright (C) 2003 by Jonathan Naylor G4KLX
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "Doppler.h"
#include <cmath>
using namespace std;
#include "Exception.h"
const int BUFFER_LEN = 64;
CDoppler::CDoppler(int sampleRate) :
m_mixer(sampleRate)
{
wxASSERT(sampleRate > 0);
}
CDoppler::~CDoppler()
{
}
void CDoppler::transform(double* input, double startFrequency, double endFrequency, double* output, int length)
{
wxASSERT(input != NULL);
wxASSERT(output != NULL);
wxASSERT(length > 0);
if ((length % BUFFER_LEN) > 0)
throw CException(wxT("Invalid length in Doppler.cpp, not a multiple of BUFFER_LEN"));
double rate = (endFrequency - startFrequency) / double(length);
int outputIndex = 0;
for (int i = 0; i < length; i += BUFFER_LEN) {
double freq = startFrequency + double(i) * rate;
double out[BUFFER_LEN];
m_mixer.mix(freq, input + i, out, BUFFER_LEN);
for (int j = 0; j < BUFFER_LEN; j++, outputIndex++)
output[outputIndex] = out[j];
}
}
|
