| /**************************************************************************** |
| ** |
| ** 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. |
| ** |
| ** |
| ** |
| ** |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| // |
| // 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 |
| |
| |