summaryrefslogtreecommitdiff
path: root/src/multimedia/audio/qaudio_mac_p.h
blob: a125da5c07a9fef82913587683450d0285325aa5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/****************************************************************************
**
** 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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