diff options
Diffstat (limited to 'examples/multimedia/audioinput/audioinput.cpp')
| -rw-r--r-- | examples/multimedia/audioinput/audioinput.cpp | 309 |
1 files changed, 183 insertions, 126 deletions
diff --git a/examples/multimedia/audioinput/audioinput.cpp b/examples/multimedia/audioinput/audioinput.cpp index fbf4dc4..b01a396 100644 --- a/examples/multimedia/audioinput/audioinput.cpp +++ b/examples/multimedia/audioinput/audioinput.cpp @@ -48,16 +48,47 @@ #include <QAudioDeviceInfo> #include <QAudioInput> + +#include <QtCore/qendian.h> + #include "audioinput.h" -#define BUFFER_SIZE 4096 +const QString InputTest::PushModeLabel(tr("Enable push mode")); +const QString InputTest::PullModeLabel(tr("Enable pull mode")); +const QString InputTest::SuspendLabel(tr("Suspend recording")); +const QString InputTest::ResumeLabel(tr("Resume recording")); -AudioInfo::AudioInfo(QObject *parent, QAudioInput *device) - :QIODevice(parent) -{ - input = device; +const int BufferSize = 4096; + +AudioInfo::AudioInfo(const QAudioFormat &format, QObject *parent) + : QIODevice(parent) + , m_format(format) + , m_maxAmplitude(0) + , m_level(0.0) - m_maxValue = 0; +{ + switch (m_format.sampleSize()) { + case 8: + switch (m_format.sampleType()) { + case QAudioFormat::UnSignedInt: + m_maxAmplitude = 255; + break; + case QAudioFormat::SignedInt: + m_maxAmplitude = 127; + break; + } + break; + case 16: + switch (m_format.sampleType()) { + case QAudioFormat::UnSignedInt: + m_maxAmplitude = 65535; + break; + case QAudioFormat::SignedInt: + m_maxAmplitude = 32767; + break; + } + break; + } } AudioInfo::~AudioInfo() @@ -84,48 +115,56 @@ qint64 AudioInfo::readData(char *data, qint64 maxlen) 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); + if (m_maxAmplitude) { + Q_ASSERT(m_format.sampleSize() % 8 == 0); + const int channelBytes = m_format.sampleSize() / 8; + const int sampleBytes = m_format.channels() * channelBytes; + Q_ASSERT(len % sampleBytes == 0); + const int numSamples = len / sampleBytes; + + quint16 maxValue = 0; + const unsigned char *ptr = reinterpret_cast<const unsigned char *>(data); + + for (int i = 0; i < numSamples; ++i) { + for(int j = 0; j < m_format.channels(); ++j) { + quint16 value = 0; + + if (m_format.sampleSize() == 8 && m_format.sampleType() == QAudioFormat::UnSignedInt) { + value = *reinterpret_cast<const quint8*>(ptr); + } else if (m_format.sampleSize() == 8 && m_format.sampleType() == QAudioFormat::SignedInt) { + value = qAbs(*reinterpret_cast<const qint8*>(ptr)); + } else if (m_format.sampleSize() == 16 && m_format.sampleType() == QAudioFormat::UnSignedInt) { + if (m_format.byteOrder() == QAudioFormat::LittleEndian) + value = qFromLittleEndian<quint16>(ptr); + else + value = qFromBigEndian<quint16>(ptr); + } else if (m_format.sampleSize() == 16 && m_format.sampleType() == QAudioFormat::SignedInt) { + if (m_format.byteOrder() == QAudioFormat::LittleEndian) + value = qAbs(qFromLittleEndian<qint16>(ptr)); + else + value = qAbs(qFromBigEndian<qint16>(ptr)); + } + + maxValue = qMax(value, maxValue); + ptr += channelBytes; + } + } + + maxValue = qMin(maxValue, m_maxAmplitude); + m_level = qreal(maxValue) / m_maxAmplitude; } - // 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; + m_level = 0; setMinimumHeight(30); setMinimumWidth(200); } @@ -139,12 +178,12 @@ void RenderArea::paintEvent(QPaintEvent * /* event */) painter.viewport().top()+10, painter.viewport().right()-20, painter.viewport().bottom()-20)); - if (level == 0) + if (m_level == 0.0) return; painter.setPen(Qt::red); - int pos = ((painter.viewport().right()-20)-(painter.viewport().left()+11))*level/100; + int pos = ((painter.viewport().right()-20)-(painter.viewport().left()+11))*m_level; for (int i = 0; i < 10; ++i) { int x1 = painter.viewport().left()+11; int y1 = painter.viewport().top()+10+i; @@ -157,156 +196,174 @@ void RenderArea::paintEvent(QPaintEvent * /* event */) } } -void RenderArea::setLevel(int value) +void RenderArea::setLevel(qreal value) { - level = value; + m_level = value; repaint(); } InputTest::InputTest() + : m_canvas(0) + , m_modeButton(0) + , m_suspendResumeButton(0) + , m_deviceBox(0) + , m_device(QAudioDeviceInfo::defaultInputDevice()) + , m_audioInfo(0) + , m_audioInput(0) + , m_input(0) + , m_pullMode(false) + , m_buffer(BufferSize, 0) { - QWidget *window = new QWidget; - QVBoxLayout* layout = new QVBoxLayout; + initializeWindow(); + initializeAudio(); +} + +InputTest::~InputTest() {} - canvas = new RenderArea; - layout->addWidget(canvas); +void InputTest::initializeWindow() +{ + QScopedPointer<QWidget> window(new QWidget); + QScopedPointer<QVBoxLayout> layout(new QVBoxLayout); - deviceBox = new QComboBox(this); + m_canvas = new RenderArea(this); + layout->addWidget(m_canvas); + + m_deviceBox = new QComboBox(this); QList<QAudioDeviceInfo> devices = QAudioDeviceInfo::availableDevices(QAudio::AudioInput); for(int i = 0; i < devices.size(); ++i) - deviceBox->addItem(devices.at(i).deviceName(), qVariantFromValue(devices.at(i))); + m_deviceBox->addItem(devices.at(i).deviceName(), qVariantFromValue(devices.at(i))); - connect(deviceBox, SIGNAL(activated(int)), SLOT(deviceChanged(int))); - layout->addWidget(deviceBox); + connect(m_deviceBox, SIGNAL(activated(int)), SLOT(deviceChanged(int))); + layout->addWidget(m_deviceBox); - button = new QPushButton(this); - button->setText(tr("Click for Push Mode")); - connect(button, SIGNAL(clicked()), SLOT(toggleMode())); - layout->addWidget(button); + m_modeButton = new QPushButton(this); + m_modeButton->setText(PushModeLabel); + connect(m_modeButton, SIGNAL(clicked()), SLOT(toggleMode())); + layout->addWidget(m_modeButton); - button2 = new QPushButton(this); - button2->setText(tr("Click To Suspend")); - connect(button2, SIGNAL(clicked()), SLOT(toggleSuspend())); - layout->addWidget(button2); + m_suspendResumeButton = new QPushButton(this); + m_suspendResumeButton->setText(SuspendLabel); + connect(m_suspendResumeButton, SIGNAL(clicked()), SLOT(toggleSuspend())); + layout->addWidget(m_suspendResumeButton); - window->setLayout(layout); - setCentralWidget(window); - window->show(); + window->setLayout(layout.data()); + layout.take(); // ownership transferred - buffer = new char[BUFFER_SIZE]; + setCentralWidget(window.data()); + QWidget *const windowPtr = window.take(); // ownership transferred + windowPtr->show(); +} - pullMode = true; +void InputTest::initializeAudio() +{ + m_pullMode = true; - format.setFrequency(8000); - format.setChannels(1); - format.setSampleSize(16); - format.setSampleType(QAudioFormat::SignedInt); - format.setByteOrder(QAudioFormat::LittleEndian); - format.setCodec("audio/pcm"); + m_format.setFrequency(8000); + m_format.setChannels(1); + m_format.setSampleSize(16); + m_format.setSampleType(QAudioFormat::SignedInt); + m_format.setByteOrder(QAudioFormat::LittleEndian); + m_format.setCodec("audio/pcm"); QAudioDeviceInfo info(QAudioDeviceInfo::defaultInputDevice()); - if (!info.isFormatSupported(format)) { - qWarning()<<"default format not supported try to use nearest"; - format = info.nearestFormat(format); + if (!info.isFormatSupported(m_format)) { + qWarning() << "Default format not supported - trying to use nearest"; + m_format = info.nearestFormat(m_format); } - if(format.sampleSize() != 16) { - qWarning()<<"audio device doesn't support 16 bit samples, example cannot run"; - audioInput = 0; - button->setDisabled(true); - button2->setDisabled(true); - return; - } + m_audioInfo = new AudioInfo(m_format, this); + connect(m_audioInfo, SIGNAL(update()), SLOT(refreshDisplay())); - 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); + createAudioInput(); } -InputTest::~InputTest() {} +void InputTest::createAudioInput() +{ + m_audioInput = new QAudioInput(m_device, m_format, this); + connect(m_audioInput, SIGNAL(notify()), SLOT(notified())); + connect(m_audioInput, SIGNAL(stateChanged(QAudio::State)), SLOT(stateChanged(QAudio::State))); + m_audioInfo->start(); + m_audioInput->start(m_audioInfo); +} -void InputTest::status() +void InputTest::notified() { - qWarning()<<"bytesReady = "<<audioInput->bytesReady()<<" bytes, elapsedUSecs = "<<audioInput->elapsedUSecs()<<", processedUSecs = "<<audioInput->processedUSecs(); + qWarning() << "bytesReady = " << m_audioInput->bytesReady() + << ", " << "elapsedUSecs = " <<m_audioInput->elapsedUSecs() + << ", " << "processedUSecs = "<<m_audioInput->processedUSecs(); } void InputTest::readMore() { - if(!audioInput) + if(!m_audioInput) return; - qint64 len = audioInput->bytesReady(); + qint64 len = m_audioInput->bytesReady(); if(len > 4096) len = 4096; - qint64 l = input->read(buffer,len); + qint64 l = m_input->read(m_buffer.data(), len); if(l > 0) { - audioinfo->write(buffer,l); + m_audioInfo->write(m_buffer.constData(), l); } } void InputTest::toggleMode() { // Change bewteen pull and push modes - audioInput->stop(); + m_audioInput->stop(); - if (pullMode) { - button->setText(tr("Click for Pull Mode")); - input = audioInput->start(); - connect(input, SIGNAL(readyRead()), SLOT(readMore())); - pullMode = false; + if (m_pullMode) { + m_modeButton->setText(PullModeLabel); + m_input = m_audioInput->start(); + connect(m_input, SIGNAL(readyRead()), SLOT(readMore())); + m_pullMode = false; } else { - button->setText(tr("Click for Push Mode")); - pullMode = true; - audioInput->start(audioinfo); + m_modeButton->setText(PushModeLabel); + m_pullMode = true; + m_audioInput->start(m_audioInfo); } + + m_suspendResumeButton->setText(SuspendLabel); } void InputTest::toggleSuspend() { // toggle suspend/resume - if(audioInput->state() == QAudio::SuspendedState) { + if(m_audioInput->state() == QAudio::SuspendedState) { qWarning() << "status: Suspended, resume()"; - audioInput->resume(); - button2->setText("Click To Suspend"); - } else if (audioInput->state() == QAudio::ActiveState) { + m_audioInput->resume(); + m_suspendResumeButton->setText(SuspendLabel); + } else if (m_audioInput->state() == QAudio::ActiveState) { qWarning() << "status: Active, suspend()"; - audioInput->suspend(); - button2->setText("Click To Resume"); - } else if (audioInput->state() == QAudio::StoppedState) { + m_audioInput->suspend(); + m_suspendResumeButton->setText(ResumeLabel); + } else if (m_audioInput->state() == QAudio::StoppedState) { qWarning() << "status: Stopped, resume()"; - audioInput->resume(); - button2->setText("Click To Suspend"); - } else if (audioInput->state() == QAudio::IdleState) { + m_audioInput->resume(); + m_suspendResumeButton->setText(SuspendLabel); + } else if (m_audioInput->state() == QAudio::IdleState) { qWarning() << "status: IdleState"; } } -void InputTest::state(QAudio::State state) +void InputTest::stateChanged(QAudio::State state) { - qWarning() << " state=" << state; + qWarning() << "state = " << state; } void InputTest::refreshDisplay() { - canvas->setLevel(audioinfo->LinearMax()); - canvas->repaint(); + m_canvas->setLevel(m_audioInfo->level()); + m_canvas->repaint(); } -void InputTest::deviceChanged(int idx) +void InputTest::deviceChanged(int index) { - 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); + m_audioInfo->stop(); + m_audioInput->stop(); + m_audioInput->disconnect(this); + delete m_audioInput; + + m_device = m_deviceBox->itemData(index).value<QAudioDeviceInfo>(); + createAudioInput(); } |