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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qaudiohelpers_p.h"
#include <QDebug>
QT_BEGIN_NAMESPACE
namespace QAudioHelperInternal
{
template<class T> void adjustSamples(qreal factor, const void *src, void *dst, int samples)
{
const T *pSrc = (const T *)src;
T *pDst = (T*)dst;
for ( int i = 0; i < samples; i++ )
pDst[i] = pSrc[i] * factor;
}
// Unsigned samples are biased around 0x80/0x8000 :/
// This makes a pure template solution a bit unwieldy but possible
template<class T> struct signedVersion {};
template<> struct signedVersion<quint8>
{
using TS = qint8;
static constexpr int offset = 0x80;
};
template<class T> void adjustUnsignedSamples(qreal factor, const void *src, void *dst, int samples)
{
const T *pSrc = (const T *)src;
T *pDst = (T*)dst;
for ( int i = 0; i < samples; i++ ) {
pDst[i] = signedVersion<T>::offset + ((typename signedVersion<T>::TS)(pSrc[i] - signedVersion<T>::offset) * factor);
}
}
void qMultiplySamples(qreal factor, const QAudioFormat &format, const void* src, void* dest, int len)
{
const int samplesCount = len / qMax(1, format.bytesPerSample());
switch (format.sampleFormat()) {
case QAudioFormat::Unknown:
case QAudioFormat::NSampleFormats:
return;
case QAudioFormat::UInt8:
QAudioHelperInternal::adjustUnsignedSamples<quint8>(factor,src,dest,samplesCount);
break;
case QAudioFormat::Int16:
QAudioHelperInternal::adjustSamples<qint16>(factor,src,dest,samplesCount);
break;
case QAudioFormat::Int32:
QAudioHelperInternal::adjustSamples<qint32>(factor,src,dest,samplesCount);
break;
case QAudioFormat::Float:
QAudioHelperInternal::adjustSamples<float>(factor,src,dest,samplesCount);
break;
}
}
}
QT_END_NAMESPACE
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