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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
/*
* Copyright (C) 2011 Google Inc. All rights reserved.
* Copyright (C) 2012 Intel Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// FFTFrame implementation using Intel IPP's DFT algorithm,
// suitable for use on Linux.
#include "wtf/build_config.h"
#if ENABLE(WEB_AUDIO)
#if USE(WEBAUDIO_IPP)
#include "platform/audio/FFTFrame.h"
#include "wtf/MathExtras.h"
namespace blink {
const unsigned maximumFFTPower2Size = 24;
// Normal constructor: allocates for a given fftSize.
FFTFrame::FFTFrame(unsigned fftSize)
: m_FFTSize(fftSize)
, m_log2FFTSize(static_cast<unsigned>(log2(fftSize)))
, m_realData(fftSize / 2)
, m_imagData(fftSize / 2)
, m_complexData(fftSize)
{
// We only allow power of two.
ASSERT(1UL << m_log2FFTSize == m_FFTSize);
ASSERT(m_log2FFTSize <= maximumFFTPower2Size);
ippsDFTInitAlloc_R_32f(&m_DFTSpec, m_FFTSize, IPP_FFT_NODIV_BY_ANY, ippAlgHintFast);
int bufferSize = 0;
ippsDFTGetBufSize_R_32f(m_DFTSpec, &bufferSize);
m_buffer = ippsMalloc_8u(bufferSize);
}
// Creates a blank/empty frame (interpolate() must later be called).
FFTFrame::FFTFrame()
: m_FFTSize(0)
, m_log2FFTSize(0)
{
}
// Copy constructor.
FFTFrame::FFTFrame(const FFTFrame& frame)
: m_FFTSize(frame.m_FFTSize)
, m_log2FFTSize(frame.m_log2FFTSize)
, m_realData(frame.m_FFTSize / 2)
, m_imagData(frame.m_FFTSize / 2)
, m_complexData(frame.m_FFTSize)
{
ippsDFTInitAlloc_R_32f(&m_DFTSpec, m_FFTSize, IPP_FFT_NODIV_BY_ANY, ippAlgHintFast);
int bufferSize = 0;
ippsDFTGetBufSize_R_32f(m_DFTSpec, &bufferSize);
m_buffer = ippsMalloc_8u(bufferSize);
// Copy/setup frame data.
unsigned numberOfBytes = sizeof(float) * m_FFTSize;
memcpy(realData(), frame.realData(), numberOfBytes);
memcpy(imagData(), frame.imagData(), numberOfBytes);
}
void FFTFrame::initialize()
{
}
void FFTFrame::cleanup()
{
}
FFTFrame::~FFTFrame()
{
ippsFree(m_buffer);
ippsDFTFree_R_32f(m_DFTSpec);
}
void FFTFrame::doFFT(const float* data)
{
Ipp32f* complexP = m_complexData.data();
// Compute Forward transform to perm format.
ippsDFTFwd_RToPerm_32f(reinterpret_cast<Ipp32f*>(const_cast<float*>(data)), complexP, m_DFTSpec, m_buffer);
Ipp32f* realP = m_realData.data();
Ipp32f* imagP = m_imagData.data();
ippsCplxToReal_32fc(reinterpret_cast<Ipp32fc*>(complexP), realP, imagP, m_FFTSize >> 1);
}
void FFTFrame::doInverseFFT(float* data)
{
Ipp32f* complexP = getUpToDateComplexData();
// Compute inverse transform.
ippsDFTInv_PermToR_32f(complexP, reinterpret_cast<Ipp32f*>(data), m_DFTSpec, m_buffer);
// Scale so that a forward then inverse FFT yields exactly the original data.
const float scale = 1.0 / m_FFTSize;
ippsMulC_32f_I(scale, reinterpret_cast<Ipp32f*>(data), m_FFTSize);
}
float* FFTFrame::getUpToDateComplexData()
{
int len = m_FFTSize >> 1;
// Merge the real and imagimary vectors to complex vector.
Ipp32f* realP = m_realData.data();
Ipp32f* imagP = m_imagData.data();
Ipp32fc* complexP = reinterpret_cast<Ipp32fc*>(m_complexData.data());
ippsRealToCplx_32f(realP, imagP, complexP, len);
return const_cast<float*>(m_complexData.data());
}
} // namespace blink
#endif // USE(WEBAUDIO_IPP)
#endif // ENABLE(WEB_AUDIO)
|
