/**************************************************************************** | |
** | |
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
** All rights reserved. | |
** Contact: Nokia Corporation (qt-info@nokia.com) | |
** | |
** This file is part of the QtMultimedia module 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. | |
** | |
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** $QT_END_LICENSE$ | |
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****************************************************************************/ | |
// | |
// 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 | |