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
|
/*
* AudioReadTarget.h
* -----------------
* Purpose: Callback class implementations for audio data read via CSoundFile::Read.
* Notes : (currently none)
* Authors: OpenMPT Devs
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
*/
#pragma once
#include "openmpt/all/BuildSettings.hpp"
#include "Sndfile.h"
#include "mpt/audio/span.hpp"
#include "openmpt/soundbase/SampleFormat.hpp"
#include "openmpt/soundbase/CopyMix.hpp"
#include "openmpt/soundbase/Dither.hpp"
#include "MixerLoops.h"
#include "Mixer.h"
#include "../common/Dither.h"
#include <type_traits>
OPENMPT_NAMESPACE_BEGIN
template <typename Taudio_span, typename TDithers = DithersOpenMPT>
class AudioTargetBuffer
: public IAudioTarget
{
private:
std::size_t countRendered;
TDithers &dithers;
protected:
Taudio_span outputBuffer;
public:
AudioTargetBuffer(Taudio_span buf, TDithers &dithers_)
: countRendered(0)
, dithers(dithers_)
, outputBuffer(buf)
{
return;
}
std::size_t GetRenderedCount() const { return countRendered; }
public:
void Process(mpt::audio_span_interleaved<MixSampleInt> buffer) override
{
std::visit(
[&](auto &ditherInstance)
{
ConvertBufferMixInternalFixedToBuffer<MixSampleIntTraits::mix_fractional_bits, false>(mpt::make_audio_span_with_offset(outputBuffer, countRendered), buffer, ditherInstance, buffer.size_channels(), buffer.size_frames());
},
dithers.Variant()
);
countRendered += buffer.size_frames();
}
void Process(mpt::audio_span_interleaved<MixSampleFloat> buffer) override
{
std::visit(
[&](auto &ditherInstance)
{
ConvertBufferMixInternalToBuffer<false>(mpt::make_audio_span_with_offset(outputBuffer, countRendered), buffer, ditherInstance, buffer.size_channels(), buffer.size_frames());
},
dithers.Variant()
);
countRendered += buffer.size_frames();
}
};
template <typename Taudio_span, typename TDithers = DithersOpenMPT>
class AudioTargetBufferWithGain
: public AudioTargetBuffer<Taudio_span>
{
private:
using Tbase = AudioTargetBuffer<Taudio_span>;
private:
const float gainFactor;
public:
AudioTargetBufferWithGain(Taudio_span buf, TDithers &dithers, float gainFactor_)
: Tbase(buf, dithers)
, gainFactor(gainFactor_)
{
return;
}
public:
void Process(mpt::audio_span_interleaved<MixSampleInt> buffer) override
{
const std::size_t countRendered_ = Tbase::GetRenderedCount();
if constexpr(!std::is_floating_point<typename Taudio_span::sample_type>::value)
{
int32 gainFactor16_16 = mpt::saturate_round<int32>(gainFactor * (1 << 16));
if(gainFactor16_16 != (1<<16))
{
// only apply gain when != +/- 0dB
// no clipping prevention is done here
for(std::size_t frame = 0; frame < buffer.size_frames(); ++frame)
{
for(std::size_t channel = 0; channel < buffer.size_channels(); ++channel)
{
buffer(channel, frame) = Util::muldiv(buffer(channel, frame), gainFactor16_16, 1 << 16);
}
}
}
}
Tbase::Process(buffer);
if constexpr(std::is_floating_point<typename Taudio_span::sample_type>::value)
{
if(gainFactor != 1.0f)
{
// only apply gain when != +/- 0dB
for(std::size_t frame = 0; frame < buffer.size_frames(); ++frame)
{
for(std::size_t channel = 0; channel < buffer.size_channels(); ++channel)
{
Tbase::outputBuffer(channel, countRendered_ + frame) *= gainFactor;
}
}
}
}
}
void Process(mpt::audio_span_interleaved<MixSampleFloat> buffer) override
{
if(gainFactor != 1.0f)
{
// only apply gain when != +/- 0dB
for(std::size_t frame = 0; frame < buffer.size_frames(); ++frame)
{
for(std::size_t channel = 0; channel < buffer.size_channels(); ++channel)
{
buffer(channel, frame) *= gainFactor;
}
}
}
Tbase::Process(buffer);
}
};
OPENMPT_NAMESPACE_END
|
