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Audio example now takes every other value from mic input
Marek Rosa -
r2159:5fd29ccd7e15
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@@ -1,59 +1,59
1 1 #include "widget.h"
2 2 #include <QAudioDeviceInfo>
3 3 #include <QAudioInput>
4 4 #include <QChartView>
5 5 #include <QLineSeries>
6 6 #include <QChart>
7 7 #include <QVBoxLayout>
8 8 #include <QValueAxis>
9 9 #include "xyseriesiodevice.h"
10 10
11 11 QTCOMMERCIALCHART_USE_NAMESPACE
12 12
13 13 Widget::Widget(QWidget *parent)
14 14 : QWidget(parent),
15 15 m_device(0),
16 16 m_chart(0),
17 17 m_series(0),
18 18 m_audioInput(0)
19 19 {
20 20 m_chart = new QChart;
21 21 QChartView *chartView = new QChartView(m_chart);
22 22 chartView->setMinimumSize(800, 600);
23 23 m_series = new QLineSeries;
24 24 m_chart->addSeries(m_series);
25 25 QValueAxis *axisX = new QValueAxis;
26 axisX->setRange(0, 8000);
26 axisX->setRange(0, 4000);
27 27 QValueAxis *axisY = new QValueAxis;
28 28 axisY->setRange(0, 256);
29 29 m_chart->setAxisX(axisX, m_series);
30 30 m_chart->setAxisY(axisY, m_series);
31 m_chart->legend()->hide();
31 32 m_chart->setTitle("Data from microphone");
32 33
33 34 QVBoxLayout *mainLayout = new QVBoxLayout;
34 35 mainLayout->addWidget(chartView);
35 36 setLayout(mainLayout);
36 37
37 38 QAudioFormat formatAudio;
38 39 formatAudio.setFrequency(8000);
39 40 formatAudio.setChannels(1);
40 41 formatAudio.setSampleSize(8);
41 42 formatAudio.setCodec("audio/pcm");
42 43 formatAudio.setByteOrder(QAudioFormat::LittleEndian);
43 44 formatAudio.setSampleType(QAudioFormat::UnSignedInt);
44 45
45 46 QAudioDeviceInfo inputDevices = QAudioDeviceInfo::defaultInputDevice();
46 47 m_audioInput = new QAudioInput(inputDevices,formatAudio, this);
47 48
48 49 m_device = new XYSeriesIODevice(m_series, this);
49 50 m_device->open(QIODevice::WriteOnly);
50 51
51 m_audioInput->setBufferSize(10);
52 52 m_audioInput->start(m_device);
53 53 }
54 54
55 55 Widget::~Widget()
56 56 {
57 57 m_audioInput->stop();
58 58 m_device->close();
59 59 }
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@@ -1,36 +1,36
1 1 #include "xyseriesiodevice.h"
2 2 #include <QXYSeries>
3 3
4 4 XYSeriesIODevice::XYSeriesIODevice(QXYSeries * series, QObject *parent) :
5 5 QIODevice(parent),
6 6 m_series(series)
7 7 {
8 8 }
9 9
10 10 qint64 XYSeriesIODevice::readData(char * data, qint64 maxSize)
11 11 {
12 12 Q_UNUSED(data)
13 13 Q_UNUSED(maxSize)
14 14 return -1;
15 15 }
16 16
17 17 qint64 XYSeriesIODevice::writeData(const char * data, qint64 maxSize)
18 18 {
19 qint64 range = 8000;
19 qint64 range = 4000;
20 20 QList<QPointF> oldPoints = m_series->points();
21 21 QList<QPointF> points;
22 22
23 23 if (oldPoints.count() < range) {
24 24 points = m_series->points();
25 25 } else {
26 for (int i = maxSize; i < oldPoints.count(); i++)
27 points.append(QPointF(i - maxSize, oldPoints.at(i).y()));
26 for (int i = maxSize/2; i < oldPoints.count(); i++)
27 points.append(QPointF(i - maxSize/2, oldPoints.at(i).y()));
28 28 }
29 29
30 30 qint64 size = points.count();
31 for (int k = 0; k < maxSize; k++)
32 points.append(QPointF(k + size, (quint8)data[k]));
31 for (int k = 0; k < maxSize/2; k++)
32 points.append(QPointF(k + size, (quint8)data[2 * k]));
33 33
34 34 m_series->replace(points);
35 35 return maxSize;
36 36 }
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