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Diffstat (limited to 'src/multimedia/audio/qaudio_mac_p.h')
-rw-r--r-- | src/multimedia/audio/qaudio_mac_p.h | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/src/multimedia/audio/qaudio_mac_p.h b/src/multimedia/audio/qaudio_mac_p.h new file mode 100644 index 0000000..8e2d522 --- /dev/null +++ b/src/multimedia/audio/qaudio_mac_p.h @@ -0,0 +1,144 @@ +/**************************************************************************** +** +** 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 either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** 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 1.0, 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. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at http://www.qtsoftware.com/contact. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +// +// 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 + + |