399500f87e
Change-Id: Ia8c1c38aba1544603fada8c414cc856f365fd15b Reviewed-by: Akseli Salovaara <akseli.salovaara@digia.com> Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
118 lines
4.3 KiB
C++
118 lines
4.3 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qaudiohelpers_p.h"
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#include <QDebug>
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QT_BEGIN_NAMESPACE
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namespace QAudioHelperInternal
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{
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template<class T> void adjustSamples(qreal factor, const void *src, void *dst, int samples)
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{
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const T *pSrc = (const T *)src;
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T *pDst = (T*)dst;
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for ( int i = 0; i < samples; i++ )
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pDst[i] = pSrc[i] * factor;
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}
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// Unsigned samples are biased around 0x80/0x8000 :/
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// This makes a pure template solution a bit unwieldy but possible
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template<class T> struct signedVersion {};
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template<> struct signedVersion<quint8>
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{
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typedef qint8 TS;
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enum {offset = 0x80};
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};
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template<> struct signedVersion<quint16>
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{
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typedef qint16 TS;
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enum {offset = 0x8000};
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};
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template<> struct signedVersion<quint32>
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{
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typedef qint32 TS;
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enum {offset = 0x80000000};
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};
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template<class T> void adjustUnsignedSamples(qreal factor, const void *src, void *dst, int samples)
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{
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const T *pSrc = (const T *)src;
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T *pDst = (T*)dst;
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for ( int i = 0; i < samples; i++ ) {
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pDst[i] = signedVersion<T>::offset + ((typename signedVersion<T>::TS)(pSrc[i] - signedVersion<T>::offset) * factor);
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}
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}
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void qMultiplySamples(qreal factor, const QAudioFormat &format, const void* src, void* dest, int len)
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{
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int samplesCount = len / (format.sampleSize()/8);
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switch ( format.sampleSize() ) {
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case 8:
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if (format.sampleType() == QAudioFormat::SignedInt)
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QAudioHelperInternal::adjustSamples<qint8>(factor,src,dest,samplesCount);
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else if (format.sampleType() == QAudioFormat::UnSignedInt)
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QAudioHelperInternal::adjustUnsignedSamples<quint8>(factor,src,dest,samplesCount);
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break;
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case 16:
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if (format.sampleType() == QAudioFormat::SignedInt)
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QAudioHelperInternal::adjustSamples<qint16>(factor,src,dest,samplesCount);
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else if (format.sampleType() == QAudioFormat::UnSignedInt)
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QAudioHelperInternal::adjustUnsignedSamples<quint16>(factor,src,dest,samplesCount);
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break;
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default:
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if (format.sampleType() == QAudioFormat::SignedInt)
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QAudioHelperInternal::adjustSamples<qint32>(factor,src,dest,samplesCount);
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else if (format.sampleType() == QAudioFormat::UnSignedInt)
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QAudioHelperInternal::adjustUnsignedSamples<quint32>(factor,src,dest,samplesCount);
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else if (format.sampleType() == QAudioFormat::Float)
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QAudioHelperInternal::adjustSamples<float>(factor,src,dest,samplesCount);
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}
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}
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}
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QT_END_NAMESPACE
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