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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples 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 <stdlib.h>
+#include <math.h>
+
+#include <QDebug>
+#include <QPainter>
+#include <QVBoxLayout>
+
+#include <QAudioDeviceInfo>
+#include <QAudioInput>
+#include "audioinput.h"
+
+#define BUFFER_SIZE 4096
+
+AudioInfo::AudioInfo(QObject* parent, QAudioInput* device)
+ :QIODevice( parent )
+{
+ input = device;
+
+ m_maxValue = 0;
+}
+
+AudioInfo::~AudioInfo()
+{
+}
+
+void AudioInfo::start()
+{
+ open(QIODevice::WriteOnly);
+}
+
+void AudioInfo::stop()
+{
+ close();
+}
+
+qint64 AudioInfo::readData(char *data, qint64 maxlen)
+{
+ Q_UNUSED(data)
+ Q_UNUSED(maxlen)
+
+ return 0;
+}
+
+qint64 AudioInfo::writeData(const char *data, qint64 len)
+{
+ int samples = len/2; // 2 bytes per sample
+ int maxAmp = 32768; // max for S16 samples
+ bool clipping = false;
+
+ m_maxValue = 0;
+
+ qint16* s = (qint16*)data;
+
+ // sample format is S16LE, only!
+
+ for(int i=0;i<samples;i++) {
+ qint16 sample = *s;
+ s++;
+ if(abs(sample) > m_maxValue) m_maxValue = abs(sample);
+ }
+ // check for clipping
+ if(m_maxValue>=(maxAmp-1)) clipping = true;
+
+ float value = ((float)m_maxValue/(float)maxAmp);
+ if(clipping) m_maxValue = 100;
+ else m_maxValue = (int)(value*100);
+
+ emit update();
+
+ return len;
+}
+
+int AudioInfo::LinearMax()
+{
+ return m_maxValue;
+}
+
+RenderArea::RenderArea(QWidget *parent)
+ : QWidget(parent)
+{
+ setBackgroundRole(QPalette::Base);
+ setAutoFillBackground(true);
+
+ level = 0;
+ setMinimumHeight(30);
+ setMinimumWidth(200);
+}
+
+void RenderArea::paintEvent(QPaintEvent * /* event */)
+{
+ QPainter painter(this);
+
+ painter.setPen(Qt::black);
+ painter.drawRect(QRect(painter.viewport().left()+10, painter.viewport().top()+10,
+ painter.viewport().right()-20, painter.viewport().bottom()-20));
+
+ if(level == 0)
+ return;
+
+ painter.setPen(Qt::red);
+
+ int pos = ((painter.viewport().right()-20)-(painter.viewport().left()+11))*level/100;
+ int x1,y1,x2,y2;
+ for(int i=0;i<10;i++) {
+ x1 = painter.viewport().left()+11;
+ y1 = painter.viewport().top()+10+i;
+ x2 = painter.viewport().left()+20+pos;
+ y2 = painter.viewport().top()+10+i;
+ if(x2 < painter.viewport().left()+10)
+ x2 = painter.viewport().left()+10;
+
+ painter.drawLine(QPoint(x1,y1),QPoint(x2,y2));
+ }
+}
+
+void RenderArea::setLevel(int value)
+{
+ level = value;
+ repaint();
+}
+
+
+InputTest::InputTest()
+{
+ QWidget *window = new QWidget;
+ QVBoxLayout* layout = new QVBoxLayout;
+
+ canvas = new RenderArea;
+ layout->addWidget(canvas);
+
+ deviceBox = new QComboBox(this);
+ QList<QAudioDeviceInfo> devices = QAudioDeviceInfo::deviceList(QAudio::AudioInput);
+ for(int i = 0; i < devices.size(); ++i) {
+ deviceBox->addItem(devices.at(i).deviceName(), qVariantFromValue(devices.at(i)));
+ }
+ connect(deviceBox,SIGNAL(activated(int)),SLOT(deviceChanged(int)));
+ layout->addWidget(deviceBox);
+
+ button = new QPushButton(this);
+ button->setText(tr("Click for Push Mode"));
+ connect(button,SIGNAL(clicked()),SLOT(toggleMode()));
+ layout->addWidget(button);
+
+ button2 = new QPushButton(this);
+ button2->setText(tr("Click To Suspend"));
+ connect(button2,SIGNAL(clicked()),SLOT(toggleSuspend()));
+ layout->addWidget(button2);
+
+ window->setLayout(layout);
+ setCentralWidget(window);
+ window->show();
+
+ buffer = new char[BUFFER_SIZE];
+
+ pullMode = true;
+
+ // AudioInfo class only supports mono S16LE samples!
+ format.setFrequency(8000);
+ format.setChannels(1);
+ format.setSampleSize(16);
+ format.setSampleType(QAudioFormat::SignedInt);
+ format.setByteOrder(QAudioFormat::LittleEndian);
+ format.setCodec("audio/pcm");
+
+ audioInput = new QAudioInput(format,this);
+ connect(audioInput,SIGNAL(notify()),SLOT(status()));
+ connect(audioInput,SIGNAL(stateChanged(QAudio::State)),SLOT(state(QAudio::State)));
+ audioinfo = new AudioInfo(this,audioInput);
+ connect(audioinfo,SIGNAL(update()),SLOT(refreshDisplay()));
+ audioinfo->start();
+ audioInput->start(audioinfo);
+}
+
+InputTest::~InputTest() {}
+
+void InputTest::status()
+{
+ qWarning()<<"bytesReady = "<<audioInput->bytesReady()<<" bytes, clock = "<<audioInput->clock()<<"ms, totalTime = "<<audioInput->totalTime()/1000<<"ms";
+}
+
+void InputTest::readMore()
+{
+ if(!audioInput)
+ return;
+ qint64 len = audioInput->bytesReady();
+ if(len > 4096)
+ len = 4096;
+ qint64 l = input->read(buffer,len);
+ if(l > 0) {
+ audioinfo->write(buffer,l);
+ }
+}
+
+void InputTest::toggleMode()
+{
+ // Change bewteen pull and push modes
+ audioInput->stop();
+
+ if (pullMode) {
+ button->setText(tr("Click for Pull Mode"));
+ input = audioInput->start(0);
+ connect(input,SIGNAL(readyRead()),SLOT(readMore()));
+ pullMode = false;
+ } else {
+ button->setText(tr("Click for Push Mode"));
+ pullMode = true;
+ audioInput->start(audioinfo);
+ }
+}
+
+void InputTest::toggleSuspend()
+{
+ // toggle suspend/resume
+ if(audioInput->state() == QAudio::SuspendState) {
+ qWarning()<<"status: Suspended, resume()";
+ audioInput->resume();
+ button2->setText("Click To Suspend");
+ } else if (audioInput->state() == QAudio::ActiveState) {
+ qWarning()<<"status: Active, suspend()";
+ audioInput->suspend();
+ button2->setText("Click To Resume");
+ } else if (audioInput->state() == QAudio::StopState) {
+ qWarning()<<"status: Stopped, resume()";
+ audioInput->resume();
+ button2->setText("Click To Suspend");
+ } else if (audioInput->state() == QAudio::IdleState) {
+ qWarning()<<"status: IdleState";
+ }
+}
+
+void InputTest::state(QAudio::State state)
+{
+ qWarning()<<" state="<<state;
+}
+
+void InputTest::refreshDisplay()
+{
+ canvas->setLevel(audioinfo->LinearMax());
+ canvas->repaint();
+}
+
+void InputTest::deviceChanged(int idx)
+{
+ audioinfo->stop();
+ audioInput->stop();
+ audioInput->disconnect(this);
+ delete audioInput;
+
+ device = deviceBox->itemData(idx).value<QAudioDeviceInfo>();
+ audioInput = new QAudioInput(device, format, this);
+ connect(audioInput,SIGNAL(notify()),SLOT(status()));
+ connect(audioInput,SIGNAL(stateChanged(QAudio::State)),SLOT(state(QAudio::State)));
+ audioinfo->start();
+ audioInput->start(audioinfo);
+}
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