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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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, Nokia gives you certain additional
** rights. These rights are described in the Nokia 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QAUDIOBUFFER_H
#define QAUDIOBUFFER_H
#include <QSharedDataPointer>
#include <qtmultimediadefs.h>
#include <qtmedianamespace.h>
#include <qaudio.h>
#include <qaudioformat.h>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Multimedia)
class QAbstractAudioBuffer;
class QAudioBufferPrivate;
class Q_MULTIMEDIA_EXPORT QAudioBuffer
{
public:
QAudioBuffer();
QAudioBuffer(QAbstractAudioBuffer *provider);
QAudioBuffer(const QAudioBuffer &other);
QAudioBuffer(const QByteArray &data, const QAudioFormat &format);
QAudioBuffer(int numSamples, const QAudioFormat &format); // Initialized to empty
QAudioBuffer& operator=(const QAudioBuffer &other);
~QAudioBuffer();
bool isValid() const;
QAudioFormat format() const;
int sampleCount() const;
int byteCount() const;
qint64 duration() const;
qint64 startTime() const;
// Data modification
// void clear();
// Other ideas
// operator *=
// operator += (need to be careful about different formats)
// Data access
const void* constData() const; // Does not detach, preferred
const void* data() const; // Does not detach
void *data(); // detaches
// Structures for easier access to stereo data
template <typename T> struct StereoSampleDefault { enum { Default = 0 }; };
template <typename T> struct StereoSample {
StereoSample()
: left(T(StereoSampleDefault<T>::Default))
, right(T(StereoSampleDefault<T>::Default))
{
}
StereoSample(T leftSample, T rightSample)
: left(leftSample)
, right(rightSample)
{
}
StereoSample& operator=(const StereoSample &other)
{
// Two straight assigns is probably
// cheaper than a conditional check on
// self assignment
left = other.left;
right = other.right;
return *this;
}
T left;
T right;
T average() const {return (left + right) / 2;}
void clear() {left = right = T(StereoSampleDefault<T>::Default);}
};
typedef StereoSample<unsigned char> S8U;
typedef StereoSample<signed char> S8S;
typedef StereoSample<unsigned short> S16U;
typedef StereoSample<signed short> S16S;
typedef StereoSample<float> S32F;
template <typename T> const T* constData() const {
return static_cast<const T*>(constData());
}
template <typename T> const T* data() const {
return static_cast<const T*>(data());
}
template <typename T> T* data() {
return static_cast<T*>(data());
}
private:
QAudioBufferPrivate *d;
};
template <> struct QAudioBuffer::StereoSampleDefault<unsigned char> { enum { Default = 128 }; };
template <> struct QAudioBuffer::StereoSampleDefault<unsigned short> { enum { Default = 32768 }; };
QT_END_NAMESPACE
Q_DECLARE_METATYPE(QAudioBuffer)
QT_END_HEADER
#endif // QAUDIOBUFFER_H
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