widget.cpp 范例文件

audio/widget.cpp
/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the Qt Charts module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:GPL$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3 or (at your option) any later version ** approved by the KDE Free Qt Foundation. The licenses are as published by ** the Free Software Foundation and appearing in the file LICENSE.GPL3 ** included in the packaging of this file. Please review the following ** information to ensure the GNU General Public License requirements will ** be met: https://www.gnu.org/licenses/gpl-3.0.html. ** ** $QT_END_LICENSE$ ** ****************************************************************************/
#include "widget.h" #include "xyseriesiodevice.h" #include <QtMultimedia/QAudioDeviceInfo> #include <QtMultimedia/QAudioInput> #include <QtCharts/QChartView> #include <QtCharts/QLineSeries> #include <QtCharts/QChart> #include <QtCharts/QValueAxis> #include <QtWidgets/QVBoxLayout> QT_CHARTS_USE_NAMESPACE Widget::Widget(const QAudioDeviceInfo &deviceInfo, QWidget *parent) : QWidget(parent), m_chart(new QChart), m_series(new QLineSeries) { QChartView *chartView = new QChartView(m_chart); chartView->setMinimumSize(800, 600); m_chart->addSeries(m_series); QValueAxis *axisX = new QValueAxis; axisX->setRange(0, XYSeriesIODevice::sampleCount); axisX->setLabelFormat("%g"); axisX->setTitleText("Samples"); QValueAxis *axisY = new QValueAxis; axisY->setRange(-1, 1); axisY->setTitleText("Audio level"); m_chart->addAxis(axisX, Qt::AlignBottom); m_series->attachAxis(axisX); m_chart->addAxis(axisY, Qt::AlignLeft); m_series->attachAxis(axisY); m_chart->legend()->hide(); m_chart->setTitle("Data from the microphone (" + deviceInfo.deviceName() + ')'); QVBoxLayout *mainLayout = new QVBoxLayout(this); mainLayout->addWidget(chartView); QAudioFormat formatAudio; formatAudio.setSampleRate(8000); formatAudio.setChannelCount(1); formatAudio.setSampleSize(8); formatAudio.setCodec("audio/pcm"); formatAudio.setByteOrder(QAudioFormat::LittleEndian); formatAudio.setSampleType(QAudioFormat::UnSignedInt); m_audioInput = new QAudioInput(deviceInfo, formatAudio, this); m_device = new XYSeriesIODevice(m_series, this); m_device->open(QIODevice::WriteOnly); m_audioInput->start(m_device); } Widget::~Widget() { m_audioInput->stop(); m_device->close(); }