summaryrefslogtreecommitdiffstats
path: root/src/multimedia/video/qmemoryvideobuffer.cpp
blob: 2e892b7d54cfcbeda0582ac6ca43f1a062361d99 (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
/****************************************************************************
**
** 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 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.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qmemoryvideobuffer_p.h"

#include <private/qabstractvideobuffer_p.h>
#include <qbytearray.h>

QT_BEGIN_NAMESPACE

class QMemoryVideoBufferPrivate : public QAbstractVideoBufferPrivate
{
public:
    QMemoryVideoBufferPrivate()
        : bytesPerLine(0)
        , mapMode(QAbstractVideoBuffer::NotMapped)
    {
    }

    int bytesPerLine;
    QAbstractVideoBuffer::MapMode mapMode;
    QByteArray data;
};

/*!
    \class QMemoryVideoBuffer
    \brief The QMemoryVideoBuffer class provides a system memory allocated video data buffer.
    \internal

    QMemoryVideoBuffer is the default video buffer for allocating system memory.  It may be used to
    allocate memory for a QVideoFrame without implementing your own QAbstractVideoBuffer.
*/

/*!
    Constructs a video buffer with an image stride of \a bytesPerLine from a byte \a array.
*/
QMemoryVideoBuffer::QMemoryVideoBuffer(const QByteArray &array, int bytesPerLine)
    : QAbstractVideoBuffer(*new QMemoryVideoBufferPrivate, NoHandle)
{
    Q_D(QMemoryVideoBuffer);

    d->data = array;
    d->bytesPerLine = bytesPerLine;
}

/*!
    Destroys a system memory allocated video buffer.
*/
QMemoryVideoBuffer::~QMemoryVideoBuffer()
{
}

/*!
    \reimp
*/
QAbstractVideoBuffer::MapMode QMemoryVideoBuffer::mapMode() const
{
    return d_func()->mapMode;
}

/*!
    \reimp
*/
uchar *QMemoryVideoBuffer::map(MapMode mode, int *numBytes, int *bytesPerLine)
{
    Q_D(QMemoryVideoBuffer);

    if (d->mapMode == NotMapped && d->data.data() && mode != NotMapped) {
        d->mapMode = mode;

        if (numBytes)
            *numBytes = d->data.size();

        if (bytesPerLine)
            *bytesPerLine = d->bytesPerLine;

        return reinterpret_cast<uchar *>(d->data.data());
    } else {
        return 0;
    }
}

/*!
    \reimp
*/
void QMemoryVideoBuffer::unmap()
{
    d_func()->mapMode = NotMapped;
}

QT_END_NAMESPACE