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-/****************************************************************************
-**
-** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
-** All rights reserved.
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** 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.
-**
-**
-**
-**
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-//
-// 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 <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
-
-