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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtMultimedia module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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, 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of other Qt classes. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#ifndef QAUDIO_MAC_P_H
#define QAUDIO_MAC_P_H
#include <CoreAudio/CoreAudio.h>
#include <QtCore/qdebug.h>
#include <QtCore/qatomic.h>
#include <QtMultimedia/qaudioformat.h>
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Multimedia)
extern QDebug operator<<(QDebug dbg, const QAudioFormat& audioFormat);
extern QAudioFormat toQAudioFormat(const AudioStreamBasicDescription& streamFormat);
extern AudioStreamBasicDescription toAudioStreamBasicDescription(QAudioFormat const& audioFormat);
class QAudioRingBuffer
{
public:
typedef QPair<char*, int> Region;
QAudioRingBuffer(int bufferSize);
~QAudioRingBuffer();
Region acquireReadRegion(int size)
{
const int used = m_bufferUsed.fetchAndAddAcquire(0);
if (used > 0) {
const int readSize = qMin(size, qMin(m_bufferSize - m_readPos, used));
return readSize > 0 ? Region(m_buffer + m_readPos, readSize) : Region(0, 0);
}
return Region(0, 0);
}
void releaseReadRegion(Region const& region)
{
m_readPos = (m_readPos + region.second) % m_bufferSize;
m_bufferUsed.fetchAndAddRelease(-region.second);
}
Region acquireWriteRegion(int size)
{
const int free = m_bufferSize - m_bufferUsed.fetchAndAddAcquire(0);
if (free > 0) {
const int writeSize = qMin(size, qMin(m_bufferSize - m_writePos, free));
return writeSize > 0 ? Region(m_buffer + m_writePos, writeSize) : Region(0, 0);
}
return Region(0, 0);
}
void releaseWriteRegion(Region const& region)
{
m_writePos = (m_writePos + region.second) % m_bufferSize;
m_bufferUsed.fetchAndAddRelease(region.second);
}
int used() const;
int free() const;
int size() const;
void reset();
private:
int m_bufferSize;
int m_readPos;
int m_writePos;
char* m_buffer;
QAtomicInt m_bufferUsed;
};
QT_END_NAMESPACE
QT_END_HEADER
#endif // QAUDIO_MAC_P_H
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