1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the Qt Data Visualization module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:GPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU
19** General Public License version 3 or (at your option) any later version
20** approved by the KDE Free Qt Foundation. The licenses are as published by
21** the Free Software Foundation and appearing in the file LICENSE.GPL3
22** included in the packaging of this file. Please review the following
23** information to ensure the GNU General Public License requirements will
24** be met: https://www.gnu.org/licenses/gpl-3.0.html.
25**
26** $QT_END_LICENSE$
27**
28****************************************************************************/
29
30#include "audiolevelsiodevice.h"
31#include "audiolevels.h"
32
33#include <QtDataVisualization/qbardataproxy.h>
34#include <QtDataVisualization/qvalue3daxis.h>
35#include <QtDataVisualization/q3dscene.h>
36#include <QtDataVisualization/q3dcamera.h>
37#include <QtDataVisualization/qbar3dseries.h>
38#include <QtDataVisualization/q3dtheme.h>
39#include <QtDataVisualization/qcustom3dlabel.h>
40
41#include <QtMultimedia/QAudioDeviceInfo>
42#include <QtMultimedia/QAudioInput>
43
44using namespace QtDataVisualization;
45
46AudioLevels::AudioLevels(Q3DBars *graph, QObject *parent)
47 : QObject(parent),
48 m_graph(graph),
49 m_device(0),
50 m_audioInput(0)
51{
52 // Set up the graph
53 m_graph->setBarThickness(0.5f);
54 m_graph->setBarSpacing(QSizeF(0.0, 1.0));
55 m_graph->valueAxis()->setRange(min: -100.0f, max: 100.0f);
56 m_graph->valueAxis()->setSegmentCount(20);
57 m_graph->valueAxis()->setLabelFormat(QStringLiteral("%d%%"));
58 m_graph->setShadowQuality(QAbstract3DGraph::ShadowQualityNone);
59 m_graph->setSelectionMode(QAbstract3DGraph::SelectionNone);
60 m_graph->scene()->activeCamera()->setCameraPosition(horizontal: -25.0f, vertical: 10.0f, zoom: 190.0f);
61 m_graph->activeTheme()->setType(Q3DTheme::ThemeIsabelle);
62 m_graph->activeTheme()->setGridEnabled(true);
63 m_graph->activeTheme()->setBackgroundEnabled(false);
64 QFont font = m_graph->activeTheme()->font();
65 font.setPointSize(10);
66 m_graph->activeTheme()->setFont(font);
67 QBar3DSeries *series = new QBar3DSeries;
68 series->setMesh(QAbstract3DSeries::MeshBar);
69 m_graph->addSeries(series);
70
71 //! [0]
72 QAudioDeviceInfo inputDevice = QAudioDeviceInfo::defaultInputDevice();
73
74 if (inputDevice.supportedSampleRates().size() > 0
75 && inputDevice.supportedChannelCounts().size() > 0
76 && inputDevice.supportedSampleSizes().size() > 0
77 && inputDevice.supportedCodecs().size() > 0) {
78 QAudioFormat formatAudio;
79 formatAudio.setSampleRate(inputDevice.supportedSampleRates().at(i: 0));
80 formatAudio.setChannelCount(inputDevice.supportedChannelCounts().at(i: 0));
81 formatAudio.setSampleSize(inputDevice.supportedSampleSizes().at(i: 0));
82 formatAudio.setCodec(inputDevice.supportedCodecs().at(i: 0));
83 formatAudio.setByteOrder(QAudioFormat::LittleEndian);
84 formatAudio.setSampleType(QAudioFormat::UnSignedInt);
85
86 m_audioInput = new QAudioInput(inputDevice, formatAudio, this);
87#ifdef Q_OS_MAC
88 // OS X seems to wait for entire buffer to fill before calling writeData, so use smaller buffer
89 m_audioInput->setBufferSize(256);
90#else
91 m_audioInput->setBufferSize(1024);
92#endif
93
94 m_device = new AudioLevelsIODevice(m_graph->seriesList().at(i: 0)->dataProxy(), this);
95 m_device->open(mode: QIODevice::WriteOnly);
96
97 m_audioInput->start(device: m_device);
98 } else {
99 // No graph content can be shown, so add a custom warning label
100 QCustom3DLabel *titleLabel = new QCustom3DLabel("No valid audio input device found",
101 QFont(),
102 QVector3D(0.2f, 0.2f, 0.0f),
103 QVector3D(1.0f, 1.0f, 0.0f),
104 QQuaternion());
105 titleLabel->setPositionAbsolute(true);
106 titleLabel->setFacingCamera(true);
107 m_graph->addCustomItem(item: titleLabel);
108 }
109 //! [0]
110}
111
112AudioLevels::~AudioLevels()
113{
114 if (m_audioInput)
115 m_audioInput->stop();
116 if (m_device)
117 m_device->close();
118}
119

source code of qtdatavis3d/examples/datavisualization/audiolevels/audiolevels.cpp