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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
#include "config.h"
#include "bformatdec.h"
#include <algorithm>
#include <array>
#include <cassert>
#include <cmath>
#include <iterator>
#include <numeric>
#include "AL/al.h"
#include "almalloc.h"
#include "alu.h"
#include "ambdec.h"
#include "filters/splitter.h"
#include "opthelpers.h"
namespace {
constexpr std::array<float,MAX_AMBI_ORDER+1> Ambi3DDecoderHFScale{{
1.00000000e+00f, 1.00000000e+00f
}};
constexpr std::array<float,MAX_AMBI_ORDER+1> Ambi3DDecoderHFScale2O{{
7.45355990e-01f, 1.00000000e+00f, 1.00000000e+00f
}};
constexpr std::array<float,MAX_AMBI_ORDER+1> Ambi3DDecoderHFScale3O{{
5.89792205e-01f, 8.79693856e-01f, 1.00000000e+00f, 1.00000000e+00f
}};
inline auto GetDecoderHFScales(ALuint order) noexcept -> const std::array<float,MAX_AMBI_ORDER+1>&
{
if(order >= 3) return Ambi3DDecoderHFScale3O;
if(order == 2) return Ambi3DDecoderHFScale2O;
return Ambi3DDecoderHFScale;
}
inline auto GetAmbiScales(AmbDecScale scaletype) noexcept
-> const std::array<float,MAX_AMBI_CHANNELS>&
{
if(scaletype == AmbDecScale::FuMa) return AmbiScale::FromFuMa;
if(scaletype == AmbDecScale::SN3D) return AmbiScale::FromSN3D;
return AmbiScale::FromN3D;
}
} // namespace
BFormatDec::BFormatDec(const AmbDecConf *conf, const bool allow_2band, const size_t inchans,
const ALuint srate, const ALuint (&chanmap)[MAX_OUTPUT_CHANNELS]) : mChannelDec{inchans}
{
mDualBand = allow_2band && (conf->FreqBands == 2);
const bool periphonic{(conf->ChanMask&AMBI_PERIPHONIC_MASK) != 0};
const std::array<float,MAX_AMBI_CHANNELS> &coeff_scale = GetAmbiScales(conf->CoeffScale);
if(!mDualBand)
{
for(size_t j{0},k{0};j < mChannelDec.size();++j)
{
const size_t acn{periphonic ? j : AmbiIndex::From2D[j]};
if(!(conf->ChanMask&(1u<<acn))) continue;
const size_t order{AmbiIndex::OrderFromChannel[acn]};
const float gain{conf->HFOrderGain[order] / coeff_scale[acn]};
for(size_t i{0u};i < conf->Speakers.size();++i)
{
const size_t chanidx{chanmap[i]};
mChannelDec[j].mGains.Single[chanidx] = conf->HFMatrix[i][k] * gain;
}
++k;
}
}
else
{
mChannelDec[0].mXOver.init(conf->XOverFreq / static_cast<float>(srate));
for(size_t j{1};j < mChannelDec.size();++j)
mChannelDec[j].mXOver = mChannelDec[0].mXOver;
const float ratio{std::pow(10.0f, conf->XOverRatio / 40.0f)};
for(size_t j{0},k{0};j < mChannelDec.size();++j)
{
const size_t acn{periphonic ? j : AmbiIndex::From2D[j]};
if(!(conf->ChanMask&(1u<<acn))) continue;
const size_t order{AmbiIndex::OrderFromChannel[acn]};
const float hfGain{conf->HFOrderGain[order] * ratio / coeff_scale[acn]};
const float lfGain{conf->LFOrderGain[order] / ratio / coeff_scale[acn]};
for(size_t i{0u};i < conf->Speakers.size();++i)
{
const size_t chanidx{chanmap[i]};
mChannelDec[j].mGains.Dual[sHFBand][chanidx] = conf->HFMatrix[i][k] * hfGain;
mChannelDec[j].mGains.Dual[sLFBand][chanidx] = conf->LFMatrix[i][k] * lfGain;
}
++k;
}
}
}
BFormatDec::BFormatDec(const size_t inchans, const al::span<const ChannelDec> coeffs,
const al::span<const ChannelDec> coeffslf) : mChannelDec{inchans}
{
mDualBand = !coeffslf.empty();
if(!mDualBand)
{
for(size_t j{0};j < mChannelDec.size();++j)
{
float *outcoeffs{mChannelDec[j].mGains.Single};
for(const ChannelDec &incoeffs : coeffs)
*(outcoeffs++) = incoeffs[j];
}
}
else
{
for(size_t j{0};j < mChannelDec.size();++j)
{
float *outcoeffs{mChannelDec[j].mGains.Dual[sHFBand]};
for(const ChannelDec &incoeffs : coeffs)
*(outcoeffs++) = incoeffs[j];
outcoeffs = mChannelDec[j].mGains.Dual[sLFBand];
for(const ChannelDec &incoeffs : coeffslf)
*(outcoeffs++) = incoeffs[j];
}
}
}
void BFormatDec::process(const al::span<FloatBufferLine> OutBuffer,
const FloatBufferLine *InSamples, const size_t SamplesToDo)
{
ASSUME(SamplesToDo > 0);
if(mDualBand)
{
const al::span<float> hfSamples{mSamples[sHFBand].data(), SamplesToDo};
const al::span<float> lfSamples{mSamples[sLFBand].data(), SamplesToDo};
for(auto &chandec : mChannelDec)
{
chandec.mXOver.process({InSamples->data(), SamplesToDo}, hfSamples.data(),
lfSamples.data());
MixSamples(hfSamples, OutBuffer, chandec.mGains.Dual[sHFBand],
chandec.mGains.Dual[sHFBand], 0, 0);
MixSamples(lfSamples, OutBuffer, chandec.mGains.Dual[sLFBand],
chandec.mGains.Dual[sLFBand], 0, 0);
++InSamples;
}
}
else
{
for(auto &chandec : mChannelDec)
{
MixSamples({InSamples->data(), SamplesToDo}, OutBuffer, chandec.mGains.Single,
chandec.mGains.Single, 0, 0);
++InSamples;
}
}
}
auto BFormatDec::GetHFOrderScales(const ALuint in_order, const ALuint out_order) noexcept
-> std::array<float,MAX_AMBI_ORDER+1>
{
std::array<float,MAX_AMBI_ORDER+1> ret{};
assert(out_order >= in_order);
const auto &target = GetDecoderHFScales(out_order);
const auto &input = GetDecoderHFScales(in_order);
for(size_t i{0};i < in_order+1;++i)
ret[i] = input[i] / target[i];
return ret;
}
|
