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     2 **

     3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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     7 ** This file is part of the examples of the Qt Toolkit.

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    16 ** GNU Lesser General Public License Usage

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 

    42 #include <stdlib.h>

    43 #include <math.h>

    44 

    45 #include <QDebug>

    46 #include <QPainter>

    47 #include <QVBoxLayout>

    48 

    49 #include <QAudioDeviceInfo>

    50 #include <QAudioInput>

    51 

    52 #include <QtCore/qendian.h>

    53 

    54 #include "audioinput.h"

    55 

    56 const QString InputTest::PushModeLabel(tr("Enable push mode"));

    57 const QString InputTest::PullModeLabel(tr("Enable pull mode"));

    58 const QString InputTest::SuspendLabel(tr("Suspend recording"));

    59 const QString InputTest::ResumeLabel(tr("Resume recording"));

    60 

    61 const int BufferSize = 4096;

    62 

    63 AudioInfo::AudioInfo(const QAudioFormat &format, QObject *parent)

    64     :   QIODevice(parent)

    65     ,   m_format(format)

    66     ,   m_maxAmplitude(0)

    67     ,   m_level(0.0)

    68 

    69 {

    70     switch (m_format.sampleSize()) {

    71     case 8:

    72         switch (m_format.sampleType()) {

    73         case QAudioFormat::UnSignedInt:

    74             m_maxAmplitude = 255;

    75             break;

    76         case QAudioFormat::SignedInt:

    77             m_maxAmplitude = 127;

    78             break;

    79         default: ;

    80         }

    81         break;

    82     case 16:

    83         switch (m_format.sampleType()) {

    84         case QAudioFormat::UnSignedInt:

    85             m_maxAmplitude = 65535;

    86             break;

    87         case QAudioFormat::SignedInt:

    88             m_maxAmplitude = 32767;

    89             break;

    90         default: ;

    91         }

    92         break;

    93     }

    94 }

    95 

    96 AudioInfo::~AudioInfo()

    97 {

    98 }

    99 

   100 void AudioInfo::start()

   101 {

   102     open(QIODevice::WriteOnly);

   103 }

   104 

   105 void AudioInfo::stop()

   106 {

   107     close();

   108 }

   109 

   110 qint64 AudioInfo::readData(char *data, qint64 maxlen)

   111 {

   112     Q_UNUSED(data)

   113     Q_UNUSED(maxlen)

   114 

   115     return 0;

   116 }

   117 

   118 qint64 AudioInfo::writeData(const char *data, qint64 len)

   119 {

   120     if (m_maxAmplitude) {

   121         Q_ASSERT(m_format.sampleSize() % 8 == 0);

   122         const int channelBytes = m_format.sampleSize() / 8;

   123         const int sampleBytes = m_format.channels() * channelBytes;

   124         Q_ASSERT(len % sampleBytes == 0);

   125         const int numSamples = len / sampleBytes;

   126 

   127         quint16 maxValue = 0;

   128         const unsigned char *ptr = reinterpret_cast<const unsigned char *>(data);

   129 

   130         for (int i = 0; i < numSamples; ++i) {

   131             for(int j = 0; j < m_format.channels(); ++j) {

   132                 quint16 value = 0;

   133 

   134                 if (m_format.sampleSize() == 8 && m_format.sampleType() == QAudioFormat::UnSignedInt) {

   135                     value = *reinterpret_cast<const quint8*>(ptr);

   136                 } else if (m_format.sampleSize() == 8 && m_format.sampleType() == QAudioFormat::SignedInt) {

   137                     value = qAbs(*reinterpret_cast<const qint8*>(ptr));

   138                 } else if (m_format.sampleSize() == 16 && m_format.sampleType() == QAudioFormat::UnSignedInt) {

   139                     if (m_format.byteOrder() == QAudioFormat::LittleEndian)

   140                         value = qFromLittleEndian<quint16>(ptr);

   141                     else

   142                         value = qFromBigEndian<quint16>(ptr);

   143                 } else if (m_format.sampleSize() == 16 && m_format.sampleType() == QAudioFormat::SignedInt) {

   144                     if (m_format.byteOrder() == QAudioFormat::LittleEndian)

   145                         value = qAbs(qFromLittleEndian<qint16>(ptr));

   146                     else

   147                         value = qAbs(qFromBigEndian<qint16>(ptr));

   148                 }

   149 

   150                 maxValue = qMax(value, maxValue);

   151                 ptr += channelBytes;

   152             }

   153         }

   154 

   155         maxValue = qMin(maxValue, m_maxAmplitude);

   156         m_level = qreal(maxValue) / m_maxAmplitude;

   157     }

   158 

   159     emit update();

   160     return len;

   161 }

   162 

   163 RenderArea::RenderArea(QWidget *parent)

   164     : QWidget(parent)

   165 {

   166     setBackgroundRole(QPalette::Base);

   167     setAutoFillBackground(true);

   168 

   169     m_level = 0;

   170     setMinimumHeight(30);

   171     setMinimumWidth(200);

   172 }

   173 

   174 void RenderArea::paintEvent(QPaintEvent * /* event */)

   175 {

   176     QPainter painter(this);

   177 

   178     painter.setPen(Qt::black);

   179     painter.drawRect(QRect(painter.viewport().left()+10,

   180                            painter.viewport().top()+10,

   181                            painter.viewport().right()-20,

   182                            painter.viewport().bottom()-20));

   183     if (m_level == 0.0)

   184         return;

   185 

   186     painter.setPen(Qt::red);

   187 

   188     int pos = ((painter.viewport().right()-20)-(painter.viewport().left()+11))*m_level;

   189     for (int i = 0; i < 10; ++i) {

   190         int x1 = painter.viewport().left()+11;

   191         int y1 = painter.viewport().top()+10+i;

   192         int x2 = painter.viewport().left()+20+pos;

   193         int y2 = painter.viewport().top()+10+i;

   194         if (x2 < painter.viewport().left()+10)

   195             x2 = painter.viewport().left()+10;

   196 

   197         painter.drawLine(QPoint(x1, y1),QPoint(x2, y2));

   198     }

   199 }

   200 

   201 void RenderArea::setLevel(qreal value)

   202 {

   203     m_level = value;

   204     repaint();

   205 }

   206 

   207 

   208 InputTest::InputTest()

   209     :   m_canvas(0)

   210     ,   m_modeButton(0)

   211     ,   m_suspendResumeButton(0)

   212     ,   m_deviceBox(0)

   213     ,   m_device(QAudioDeviceInfo::defaultInputDevice())

   214     ,   m_audioInfo(0)

   215     ,   m_audioInput(0)

   216     ,   m_input(0)

   217     ,   m_pullMode(false)

   218     ,   m_buffer(BufferSize, 0)

   219 {

   220     initializeWindow();

   221     initializeAudio();

   222 }

   223 

   224 InputTest::~InputTest() {}

   225 

   226 void InputTest::initializeWindow()

   227 {

   228     QScopedPointer<QWidget> window(new QWidget);

   229     QScopedPointer<QVBoxLayout> layout(new QVBoxLayout);

   230 

   231     m_canvas = new RenderArea(this);

   232     layout->addWidget(m_canvas);

   233 

   234     m_deviceBox = new QComboBox(this);

   235     QList<QAudioDeviceInfo> devices = QAudioDeviceInfo::availableDevices(QAudio::AudioInput);

   236     for(int i = 0; i < devices.size(); ++i)

   237         m_deviceBox->addItem(devices.at(i).deviceName(), qVariantFromValue(devices.at(i)));

   238 

   239     connect(m_deviceBox, SIGNAL(activated(int)), SLOT(deviceChanged(int)));

   240     layout->addWidget(m_deviceBox);

   241 

   242     m_modeButton = new QPushButton(this);

   243     m_modeButton->setText(PushModeLabel);

   244     connect(m_modeButton, SIGNAL(clicked()), SLOT(toggleMode()));

   245     layout->addWidget(m_modeButton);

   246 

   247     m_suspendResumeButton = new QPushButton(this);

   248     m_suspendResumeButton->setText(SuspendLabel);

   249     connect(m_suspendResumeButton, SIGNAL(clicked()), SLOT(toggleSuspend()));

   250     layout->addWidget(m_suspendResumeButton);

   251 

   252     window->setLayout(layout.data());

   253     layout.take(); // ownership transferred

   254 

   255     setCentralWidget(window.data());

   256     QWidget *const windowPtr = window.take(); // ownership transferred

   257     windowPtr->show();

   258 }

   259 

   260 void InputTest::initializeAudio()

   261 {

   262     m_pullMode = true;

   263 

   264     m_format.setFrequency(8000);

   265     m_format.setChannels(1);

   266     m_format.setSampleSize(16);

   267     m_format.setSampleType(QAudioFormat::SignedInt);

   268     m_format.setByteOrder(QAudioFormat::LittleEndian);

   269     m_format.setCodec("audio/pcm");

   270 

   271     QAudioDeviceInfo info(QAudioDeviceInfo::defaultInputDevice());

   272     if (!info.isFormatSupported(m_format)) {

   273         qWarning() << "Default format not supported - trying to use nearest";

   274         m_format = info.nearestFormat(m_format);

   275     }

   276 

   277     m_audioInfo  = new AudioInfo(m_format, this);

   278     connect(m_audioInfo, SIGNAL(update()), SLOT(refreshDisplay()));

   279 

   280     createAudioInput();

   281 }

   282 

   283 void InputTest::createAudioInput()

   284 {

   285     m_audioInput = new QAudioInput(m_device, m_format, this);

   286     connect(m_audioInput, SIGNAL(notify()), SLOT(notified()));

   287     connect(m_audioInput, SIGNAL(stateChanged(QAudio::State)), SLOT(stateChanged(QAudio::State)));

   288     m_audioInfo->start();

   289     m_audioInput->start(m_audioInfo);

   290 }

   291 

   292 void InputTest::notified()

   293 {

   294     qWarning() << "bytesReady = " << m_audioInput->bytesReady()

   295                << ", " << "elapsedUSecs = " <<m_audioInput->elapsedUSecs()

   296                << ", " << "processedUSecs = "<<m_audioInput->processedUSecs();

   297 }

   298 

   299 void InputTest::readMore()

   300 {

   301     if(!m_audioInput)

   302         return;

   303     qint64 len = m_audioInput->bytesReady();

   304     if(len > 4096)

   305         len = 4096;

   306     qint64 l = m_input->read(m_buffer.data(), len);

   307     if(l > 0) {

   308         m_audioInfo->write(m_buffer.constData(), l);

   309     }

   310 }

   311 

   312 void InputTest::toggleMode()

   313 {

   314     // Change bewteen pull and push modes

   315     m_audioInput->stop();

   316 

   317     if (m_pullMode) {

   318         m_modeButton->setText(PullModeLabel);

   319         m_input = m_audioInput->start();

   320         connect(m_input, SIGNAL(readyRead()), SLOT(readMore()));

   321         m_pullMode = false;

   322     } else {

   323         m_modeButton->setText(PushModeLabel);

   324         m_pullMode = true;

   325         m_audioInput->start(m_audioInfo);

   326     }

   327 

   328     m_suspendResumeButton->setText(SuspendLabel);

   329 }

   330 

   331 void InputTest::toggleSuspend()

   332 {

   333     // toggle suspend/resume

   334     if(m_audioInput->state() == QAudio::SuspendedState) {

   335         qWarning() << "status: Suspended, resume()";

   336         m_audioInput->resume();

   337         m_suspendResumeButton->setText(SuspendLabel);

   338     } else if (m_audioInput->state() == QAudio::ActiveState) {

   339         qWarning() << "status: Active, suspend()";

   340         m_audioInput->suspend();

   341         m_suspendResumeButton->setText(ResumeLabel);

   342     } else if (m_audioInput->state() == QAudio::StoppedState) {

   343         qWarning() << "status: Stopped, resume()";

   344         m_audioInput->resume();

   345         m_suspendResumeButton->setText(SuspendLabel);

   346     } else if (m_audioInput->state() == QAudio::IdleState) {

   347         qWarning() << "status: IdleState";

   348     }

   349 }

   350 

   351 void InputTest::stateChanged(QAudio::State state)

   352 {

   353     qWarning() << "state = " << state;

   354 }

   355 

   356 void InputTest::refreshDisplay()

   357 {

   358     m_canvas->setLevel(m_audioInfo->level());

   359     m_canvas->repaint();

   360 }

   361 

   362 void InputTest::deviceChanged(int index)

   363 {

   364     m_audioInfo->stop();

   365     m_audioInput->stop();

   366     m_audioInput->disconnect(this);

   367     delete m_audioInput;

   368 

   369     m_device = m_deviceBox->itemData(index).value<QAudioDeviceInfo>();

   370     createAudioInput();

   371 }