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
|
/*
* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/modules/audio_processing/splitting_filter.h"
#include "webrtc/base/checks.h"
#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
#include "webrtc/common_audio/channel_buffer.h"
namespace webrtc {
SplittingFilter::SplittingFilter(int num_channels,
size_t num_bands,
size_t num_frames)
: num_bands_(num_bands) {
RTC_CHECK(num_bands_ == 2 || num_bands_ == 3);
if (num_bands_ == 2) {
two_bands_states_.resize(num_channels);
} else if (num_bands_ == 3) {
for (int i = 0; i < num_channels; ++i) {
three_band_filter_banks_.push_back(new ThreeBandFilterBank(num_frames));
}
}
}
void SplittingFilter::Analysis(const IFChannelBuffer* data,
IFChannelBuffer* bands) {
RTC_DCHECK_EQ(num_bands_, bands->num_bands());
RTC_DCHECK_EQ(data->num_channels(), bands->num_channels());
RTC_DCHECK_EQ(data->num_frames(),
bands->num_frames_per_band() * bands->num_bands());
if (bands->num_bands() == 2) {
TwoBandsAnalysis(data, bands);
} else if (bands->num_bands() == 3) {
ThreeBandsAnalysis(data, bands);
}
}
void SplittingFilter::Synthesis(const IFChannelBuffer* bands,
IFChannelBuffer* data) {
RTC_DCHECK_EQ(num_bands_, bands->num_bands());
RTC_DCHECK_EQ(data->num_channels(), bands->num_channels());
RTC_DCHECK_EQ(data->num_frames(),
bands->num_frames_per_band() * bands->num_bands());
if (bands->num_bands() == 2) {
TwoBandsSynthesis(bands, data);
} else if (bands->num_bands() == 3) {
ThreeBandsSynthesis(bands, data);
}
}
void SplittingFilter::TwoBandsAnalysis(const IFChannelBuffer* data,
IFChannelBuffer* bands) {
RTC_DCHECK_EQ(static_cast<int>(two_bands_states_.size()),
data->num_channels());
for (size_t i = 0; i < two_bands_states_.size(); ++i) {
WebRtcSpl_AnalysisQMF(data->ibuf_const()->channels()[i],
data->num_frames(),
bands->ibuf()->channels(0)[i],
bands->ibuf()->channels(1)[i],
two_bands_states_[i].analysis_state1,
two_bands_states_[i].analysis_state2);
}
}
void SplittingFilter::TwoBandsSynthesis(const IFChannelBuffer* bands,
IFChannelBuffer* data) {
RTC_DCHECK_EQ(static_cast<int>(two_bands_states_.size()),
data->num_channels());
for (size_t i = 0; i < two_bands_states_.size(); ++i) {
WebRtcSpl_SynthesisQMF(bands->ibuf_const()->channels(0)[i],
bands->ibuf_const()->channels(1)[i],
bands->num_frames_per_band(),
data->ibuf()->channels()[i],
two_bands_states_[i].synthesis_state1,
two_bands_states_[i].synthesis_state2);
}
}
void SplittingFilter::ThreeBandsAnalysis(const IFChannelBuffer* data,
IFChannelBuffer* bands) {
RTC_DCHECK_EQ(static_cast<int>(three_band_filter_banks_.size()),
data->num_channels());
for (size_t i = 0; i < three_band_filter_banks_.size(); ++i) {
three_band_filter_banks_[i]->Analysis(data->fbuf_const()->channels()[i],
data->num_frames(),
bands->fbuf()->bands(i));
}
}
void SplittingFilter::ThreeBandsSynthesis(const IFChannelBuffer* bands,
IFChannelBuffer* data) {
RTC_DCHECK_EQ(static_cast<int>(three_band_filter_banks_.size()),
data->num_channels());
for (size_t i = 0; i < three_band_filter_banks_.size(); ++i) {
three_band_filter_banks_[i]->Synthesis(bands->fbuf_const()->bands(i),
bands->num_frames_per_band(),
data->fbuf()->channels()[i]);
}
}
} // namespace webrtc
|
