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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.h>

    50 #include <qaudioinput.h>

    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             break;

    81         }

    82         break;

    83     case 16:

    84         switch (m_format.sampleType()) {

    85         case QAudioFormat::UnSignedInt:

    86             m_maxAmplitude = 65535;

    87             break;

    88         case QAudioFormat::SignedInt:

    89             m_maxAmplitude = 32767;

    90             break;

    91         default:

    92             break;

    93         }

    94         break;

    95     default:

    96         break;

    97     }

    98 }

    99 

   100 AudioInfo::~AudioInfo()

   101 {

   102 }

   103 

   104 void AudioInfo::start()

   105 {

   106     open(QIODevice::WriteOnly);

   107 }

   108 

   109 void AudioInfo::stop()

   110 {

   111     close();

   112 }

   113 

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

   115 {

   116     Q_UNUSED(data)

   117     Q_UNUSED(maxlen)

   118 

   119     return 0;

   120 }

   121 

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

   123 {

   124     if (m_maxAmplitude) {

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

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

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

   128         Q_ASSERT(len % sampleBytes == 0);

   129         const int numSamples = len / sampleBytes;

   130 

   131         quint16 maxValue = 0;

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

   133 

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

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

   136                 quint16 value = 0;

   137 

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

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

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

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

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

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

   144                         value = qFromLittleEndian<quint16>(ptr);

   145                     else

   146                         value = qFromBigEndian<quint16>(ptr);

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

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

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

   150                     else

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

   152                 }

   153 

   154                 maxValue = qMax(value, maxValue);

   155                 ptr += channelBytes;

   156             }

   157         }

   158 

   159         maxValue = qMin(maxValue, m_maxAmplitude);

   160         m_level = qreal(maxValue) / m_maxAmplitude;

   161     }

   162 

   163     emit update();

   164     return len;

   165 }

   166 

   167 RenderArea::RenderArea(QWidget *parent)

   168     : QWidget(parent)

   169 {

   170     setBackgroundRole(QPalette::Base);

   171     setAutoFillBackground(true);

   172 

   173     m_level = 0;

   174     setMinimumHeight(30);

   175     setMinimumWidth(200);

   176 }

   177 

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

   179 {

   180     QPainter painter(this);

   181 

   182     painter.setPen(Qt::black);

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

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

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

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

   187     if (m_level == 0.0)

   188         return;

   189 

   190     painter.setPen(Qt::red);

   191 

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

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

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

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

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

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

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

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

   200 

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

   202     }

   203 }

   204 

   205 void RenderArea::setLevel(qreal value)

   206 {

   207     m_level = value;

   208     repaint();

   209 }

   210 

   211 

   212 InputTest::InputTest()

   213     :   m_canvas(0)

   214     ,   m_modeButton(0)

   215     ,   m_suspendResumeButton(0)

   216     ,   m_deviceBox(0)

   217     ,   m_device(QAudioDeviceInfo::defaultInputDevice())

   218     ,   m_audioInfo(0)

   219     ,   m_audioInput(0)

   220     ,   m_input(0)

   221     ,   m_pullMode(false)

   222     ,   m_buffer(BufferSize, 0)

   223 {

   224     initializeWindow();

   225     initializeAudio();

   226 }

   227 

   228 InputTest::~InputTest() {}

   229 

   230 void InputTest::initializeWindow()

   231 {

   232     QScopedPointer<QWidget> window(new QWidget);

   233     QScopedPointer<QVBoxLayout> layout(new QVBoxLayout);

   234 

   235     m_canvas = new RenderArea(this);

   236     layout->addWidget(m_canvas);

   237 

   238     m_deviceBox = new QComboBox(this);

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

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

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

   242 

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

   244     layout->addWidget(m_deviceBox);

   245 

   246     m_modeButton = new QPushButton(this);

   247     m_modeButton->setText(PushModeLabel);

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

   249     layout->addWidget(m_modeButton);

   250 

   251     m_suspendResumeButton = new QPushButton(this);

   252     m_suspendResumeButton->setText(SuspendLabel);

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

   254     layout->addWidget(m_suspendResumeButton);

   255 

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

   257     layout.take(); // ownership transferred

   258 

   259     setCentralWidget(window.data());

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

   261     windowPtr->show();

   262 }

   263 

   264 void InputTest::initializeAudio()

   265 {

   266     m_pullMode = true;

   267 

   268     m_format.setFrequency(8000);

   269     m_format.setChannels(1);

   270     m_format.setSampleSize(16);

   271     m_format.setSampleType(QAudioFormat::SignedInt);

   272     m_format.setByteOrder(QAudioFormat::LittleEndian);

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

   274 

   275     QAudioDeviceInfo info(QAudioDeviceInfo::defaultInputDevice());

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

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

   278         m_format = info.nearestFormat(m_format);

   279     }

   280 

   281     m_audioInfo  = new AudioInfo(m_format, this);

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

   283 

   284     createAudioInput();

   285 }

   286 

   287 void InputTest::createAudioInput()

   288 {

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

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

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

   292     m_audioInfo->start();

   293     m_audioInput->start(m_audioInfo);

   294 }

   295 

   296 void InputTest::notified()

   297 {

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

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

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

   301 }

   302 

   303 void InputTest::readMore()

   304 {

   305     if(!m_audioInput)

   306         return;

   307     qint64 len = m_audioInput->bytesReady();

   308     if(len > 4096)

   309         len = 4096;

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

   311     if(l > 0) {

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

   313     }

   314 }

   315 

   316 void InputTest::toggleMode()

   317 {

   318     // Change bewteen pull and push modes

   319     m_audioInput->stop();

   320 

   321     if (m_pullMode) {

   322         m_modeButton->setText(PullModeLabel);

   323         m_input = m_audioInput->start();

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

   325         m_pullMode = false;

   326     } else {

   327         m_modeButton->setText(PushModeLabel);

   328         m_pullMode = true;

   329         m_audioInput->start(m_audioInfo);

   330     }

   331 

   332     m_suspendResumeButton->setText(SuspendLabel);

   333 }

   334 

   335 void InputTest::toggleSuspend()

   336 {

   337     // toggle suspend/resume

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

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

   340         m_audioInput->resume();

   341         m_suspendResumeButton->setText(SuspendLabel);

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

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

   344         m_audioInput->suspend();

   345         m_suspendResumeButton->setText(ResumeLabel);

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

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

   348         m_audioInput->resume();

   349         m_suspendResumeButton->setText(SuspendLabel);

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

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

   352     }

   353 }

   354 

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

   356 {

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

   358 }

   359 

   360 void InputTest::refreshDisplay()

   361 {

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

   363     m_canvas->repaint();

   364 }

   365 

   366 void InputTest::deviceChanged(int index)

   367 {

   368     m_audioInfo->stop();

   369     m_audioInput->stop();

   370     m_audioInput->disconnect(this);

   371     delete m_audioInput;

   372 

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

   374     createAudioInput();

   375 }