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[AFV] Apply BiQuadFilters on float samples

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This commit is contained in:
Roland Rossgotterer
2019-09-30 14:19:50 +02:00
committed by Mat Sutcliffe
parent d757b8977f
commit 574370579d
4 changed files with 42 additions and 16 deletions
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23
src/blacksound/audioutilities.cpp
View File

@@ -26,7 +26,7 @@ namespace BlackSound
QVector<qint16> convertFloatBytesTo16BitPCM(const QByteArray input)
{
Q_UNUSED(input)
qFatal("Not implemented");
// qFatal("Not implemented");
return {};
}
@@ -52,4 +52,25 @@ namespace BlackSound
}
return mono;
}
QVector<double> convertFromShortToDouble(const QVector<qint16> &input)
{
QVector<double> output;
for (auto sample : input)
{
output.push_back(sample / 32768.0);
}
return output;
}
QVector<qint16> convertFromDoubleToShort(const QVector<double> &input)
{
QVector<qint16> output;
for (auto sample : input)
{
output.push_back(sample * 32768);
}
return output;
}
} // ns

2
src/blacksound/audioutilities.h
View File

@@ -22,6 +22,8 @@ namespace BlackSound
BLACKSOUND_EXPORT QVector<qint16> convertFloatBytesTo16BitPCM(const QByteArray input);
BLACKSOUND_EXPORT QVector<qint16> convertFromMonoToStereo(const QVector<qint16> &mono);
BLACKSOUND_EXPORT QVector<qint16> convertFromStereoToMono(const QVector<qint16> &stereo);
BLACKSOUND_EXPORT QVector<double> convertFromShortToDouble(const QVector<qint16> &input);
BLACKSOUND_EXPORT QVector<qint16> convertFromDoubleToShort(const QVector<double> &input);
//! @}
} // ns

23
src/blacksound/sampleprovider/equalizersampleprovider.cpp
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@@ -1,4 +1,6 @@
#include "equalizersampleprovider.h"
#include "blacksound/audioutilities.h"
#include <QDebug>
namespace BlackSound
{
@@ -16,19 +18,20 @@ namespace BlackSound
int samplesRead = m_sourceProvider->readSamples(samples, count);
if (m_bypass) return samplesRead;
QVector<double> doubleSamples = convertFromShortToDouble(samples);
for (int n = 0; n < samplesRead; n++)
{
// TODO stereo implementation
for (int band = 0; band < m_filters.size(); band++)
{
float s = samples[n] / 32768.0f;
s = m_filters[band].process(s);
samples[n] = s * 32768;
doubleSamples[n] = m_filters[band].process(doubleSamples[n]);
}
samples[n] *= m_outputGain;
doubleSamples[n] *= m_outputGain;
}
samples = convertFromDoubleToShort(doubleSamples);
return samplesRead;
}
@@ -37,11 +40,11 @@ namespace BlackSound
switch (preset)
{
case VHFEmulation:
m_filters.push_back(BiQuadFilter(BiQuadFilterType::HighPass, 44100, 310, 0.25f));
m_filters.push_back(BiQuadFilter(BiQuadFilterType::Peak, 44100, 450, 0.75f, 17.0f));
m_filters.push_back(BiQuadFilter(BiQuadFilterType::Peak, 44100, 1450, 1.0f, 25.0f));
m_filters.push_back(BiQuadFilter(BiQuadFilterType::Peak, 44100, 2000, 1.0f, 25.0f));
m_filters.push_back(BiQuadFilter(BiQuadFilterType::LowPass, 44100, 2500, 0.25f));
m_filters.push_back(BiQuadFilter(BiQuadFilterType::HighPass, 44100, 310, 0.25));
m_filters.push_back(BiQuadFilter(BiQuadFilterType::Peak, 44100, 450, 0.75, 17.0));
m_filters.push_back(BiQuadFilter(BiQuadFilterType::Peak, 44100, 1450, 1.0, 25.0));
m_filters.push_back(BiQuadFilter(BiQuadFilterType::Peak, 44100, 2000, 1.0, 25.0));
m_filters.push_back(BiQuadFilter(BiQuadFilterType::LowPass, 44100, 2500, 0.25));
break;
}
}