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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.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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