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
178
179
180
181
182
183
|
/**
* OpenAL cross platform audio library
* Copyright (C) 2009 by Chris Robinson.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
* Or go to http://www.gnu.org/copyleft/lgpl.html
*/
#include "config.h"
#include <algorithm>
#include <array>
#include <cstdlib>
#include <iterator>
#include "alcontext.h"
#include "almalloc.h"
#include "alnumeric.h"
#include "alspan.h"
#include "core/ambidefs.h"
#include "core/bufferline.h"
#include "core/devformat.h"
#include "core/device.h"
#include "core/filters/biquad.h"
#include "core/mixer.h"
#include "effects/base.h"
#include "effectslot.h"
#include "intrusive_ptr.h"
#include "math_defs.h"
namespace {
using uint = unsigned int;
#define MAX_UPDATE_SAMPLES 128
#define WAVEFORM_FRACBITS 24
#define WAVEFORM_FRACONE (1<<WAVEFORM_FRACBITS)
#define WAVEFORM_FRACMASK (WAVEFORM_FRACONE-1)
inline float Sin(uint index)
{
constexpr float scale{al::MathDefs<float>::Tau() / WAVEFORM_FRACONE};
return std::sin(static_cast<float>(index) * scale);
}
inline float Saw(uint index)
{ return static_cast<float>(index)*(2.0f/WAVEFORM_FRACONE) - 1.0f; }
inline float Square(uint index)
{ return static_cast<float>(static_cast<int>((index>>(WAVEFORM_FRACBITS-2))&2) - 1); }
inline float One(uint) { return 1.0f; }
template<float (&func)(uint)>
void Modulate(float *RESTRICT dst, uint index, const uint step, size_t todo)
{
for(size_t i{0u};i < todo;i++)
{
index += step;
index &= WAVEFORM_FRACMASK;
dst[i] = func(index);
}
}
struct ModulatorState final : public EffectState {
void (*mGetSamples)(float*RESTRICT, uint, const uint, size_t){};
uint mIndex{0};
uint mStep{1};
struct {
BiquadFilter Filter;
float CurrentGains[MAX_OUTPUT_CHANNELS]{};
float TargetGains[MAX_OUTPUT_CHANNELS]{};
} mChans[MaxAmbiChannels];
void deviceUpdate(const DeviceBase *device, const Buffer &buffer) override;
void update(const ContextBase *context, const EffectSlot *slot, const EffectProps *props,
const EffectTarget target) override;
void process(const size_t samplesToDo, const al::span<const FloatBufferLine> samplesIn,
const al::span<FloatBufferLine> samplesOut) override;
DEF_NEWDEL(ModulatorState)
};
void ModulatorState::deviceUpdate(const DeviceBase*, const Buffer&)
{
for(auto &e : mChans)
{
e.Filter.clear();
std::fill(std::begin(e.CurrentGains), std::end(e.CurrentGains), 0.0f);
}
}
void ModulatorState::update(const ContextBase *context, const EffectSlot *slot,
const EffectProps *props, const EffectTarget target)
{
const DeviceBase *device{context->mDevice};
const float step{props->Modulator.Frequency / static_cast<float>(device->Frequency)};
mStep = fastf2u(clampf(step*WAVEFORM_FRACONE, 0.0f, float{WAVEFORM_FRACONE-1}));
if(mStep == 0)
mGetSamples = Modulate<One>;
else if(props->Modulator.Waveform == ModulatorWaveform::Sinusoid)
mGetSamples = Modulate<Sin>;
else if(props->Modulator.Waveform == ModulatorWaveform::Sawtooth)
mGetSamples = Modulate<Saw>;
else /*if(props->Modulator.Waveform == ModulatorWaveform::Square)*/
mGetSamples = Modulate<Square>;
float f0norm{props->Modulator.HighPassCutoff / static_cast<float>(device->Frequency)};
f0norm = clampf(f0norm, 1.0f/512.0f, 0.49f);
/* Bandwidth value is constant in octaves. */
mChans[0].Filter.setParamsFromBandwidth(BiquadType::HighPass, f0norm, 1.0f, 0.75f);
for(size_t i{1u};i < slot->Wet.Buffer.size();++i)
mChans[i].Filter.copyParamsFrom(mChans[0].Filter);
mOutTarget = target.Main->Buffer;
auto set_gains = [slot,target](auto &chan, al::span<const float,MaxAmbiChannels> coeffs)
{ ComputePanGains(target.Main, coeffs.data(), slot->Gain, chan.TargetGains); };
SetAmbiPanIdentity(std::begin(mChans), slot->Wet.Buffer.size(), set_gains);
}
void ModulatorState::process(const size_t samplesToDo, const al::span<const FloatBufferLine> samplesIn, const al::span<FloatBufferLine> samplesOut)
{
for(size_t base{0u};base < samplesToDo;)
{
alignas(16) float modsamples[MAX_UPDATE_SAMPLES];
const size_t td{minz(MAX_UPDATE_SAMPLES, samplesToDo-base)};
mGetSamples(modsamples, mIndex, mStep, td);
mIndex += static_cast<uint>(mStep * td);
mIndex &= WAVEFORM_FRACMASK;
auto chandata = std::begin(mChans);
for(const auto &input : samplesIn)
{
alignas(16) float temps[MAX_UPDATE_SAMPLES];
chandata->Filter.process({&input[base], td}, temps);
for(size_t i{0u};i < td;i++)
temps[i] *= modsamples[i];
MixSamples({temps, td}, samplesOut, chandata->CurrentGains, chandata->TargetGains,
samplesToDo-base, base);
++chandata;
}
base += td;
}
}
struct ModulatorStateFactory final : public EffectStateFactory {
al::intrusive_ptr<EffectState> create() override
{ return al::intrusive_ptr<EffectState>{new ModulatorState{}}; }
};
} // namespace
EffectStateFactory *ModulatorStateFactory_getFactory()
{
static ModulatorStateFactory ModulatorFactory{};
return &ModulatorFactory;
}
|
