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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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>
{
typedef qint8 TS;
enum {offset = 0x80};
};
template<> struct signedVersion<quint16>
{
typedef qint16 TS;
enum {offset = 0x8000};
};
template<> struct signedVersion<quint32>
{
typedef qint32 TS;
enum {offset = 0x80000000};
};
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)
{
int samplesCount = len / (format.sampleSize()/8);
switch ( format.sampleSize() ) {
case 8:
if (format.sampleType() == QAudioFormat::SignedInt)
QAudioHelperInternal::adjustSamples<qint8>(factor,src,dest,samplesCount);
else if (format.sampleType() == QAudioFormat::UnSignedInt)
QAudioHelperInternal::adjustUnsignedSamples<quint8>(factor,src,dest,samplesCount);
break;
case 16:
if (format.sampleType() == QAudioFormat::SignedInt)
QAudioHelperInternal::adjustSamples<qint16>(factor,src,dest,samplesCount);
else if (format.sampleType() == QAudioFormat::UnSignedInt)
QAudioHelperInternal::adjustUnsignedSamples<quint16>(factor,src,dest,samplesCount);
break;
default:
if (format.sampleType() == QAudioFormat::SignedInt)
QAudioHelperInternal::adjustSamples<qint32>(factor,src,dest,samplesCount);
else if (format.sampleType() == QAudioFormat::UnSignedInt)
QAudioHelperInternal::adjustUnsignedSamples<quint32>(factor,src,dest,samplesCount);
else if (format.sampleType() == QAudioFormat::Float)
QAudioHelperInternal::adjustSamples<float>(factor,src,dest,samplesCount);
}
}
}
QT_END_NAMESPACE
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