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-rw-r--r--examples/multimedia/audioinput/audioinput.cpp309
-rw-r--r--examples/multimedia/audioinput/audioinput.h60
-rw-r--r--examples/multimedia/audiooutput/audiooutput.cpp346
-rw-r--r--examples/multimedia/audiooutput/audiooutput.h68
4 files changed, 444 insertions, 339 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();
}
diff --git a/examples/multimedia/audioinput/audioinput.h b/examples/multimedia/audioinput/audioinput.h
index abe2be1..f87c682 100644
--- a/examples/multimedia/audioinput/audioinput.h
+++ b/examples/multimedia/audioinput/audioinput.h
@@ -45,6 +45,7 @@
#include <QMainWindow>
#include <QPushButton>
#include <QComboBox>
+#include <QByteArray>
#include <qaudioinput.h>
@@ -52,21 +53,21 @@ class AudioInfo : public QIODevice
{
Q_OBJECT
public:
- AudioInfo(QObject *parent, QAudioInput *device);
+ AudioInfo(const QAudioFormat &format, QObject *parent);
~AudioInfo();
void start();
void stop();
- int LinearMax();
+ qreal level() const { return m_level; }
qint64 readData(char *data, qint64 maxlen);
qint64 writeData(const char *data, qint64 len);
- QAudioInput *input;
-
private:
- int m_maxValue;
+ const QAudioFormat m_format;
+ quint16 m_maxAmplitude;
+ qreal m_level; // 0.0 <= m_level <= 1.0
signals:
void update();
@@ -80,14 +81,14 @@ class RenderArea : public QWidget
public:
RenderArea(QWidget *parent = 0);
- void setLevel(int value);
+ void setLevel(qreal value);
protected:
void paintEvent(QPaintEvent *event);
private:
- int level;
- QPixmap pixmap;
+ qreal m_level;
+ QPixmap m_pixmap;
};
class InputTest : public QMainWindow
@@ -97,29 +98,38 @@ public:
InputTest();
~InputTest();
+private:
+ void initializeWindow();
+ void initializeAudio();
+ void createAudioInput();
+
private slots:
void refreshDisplay();
- void status();
+ void notified();
void readMore();
void toggleMode();
void toggleSuspend();
- void state(QAudio::State s);
- void deviceChanged(int idx);
+ void stateChanged(QAudio::State state);
+ void deviceChanged(int index);
private:
- AudioInfo *audioinfo;
- QAudioDeviceInfo device;
- QAudioFormat format;
- QAudioInput *audioInput;
- QIODevice *input;
- RenderArea *canvas;
-
- bool pullMode;
-
- QPushButton *button;
- QPushButton *button2;
- QComboBox *deviceBox;
-
- char *buffer;
+ // Owned by layout
+ RenderArea *m_canvas;
+ QPushButton *m_modeButton;
+ QPushButton *m_suspendResumeButton;
+ QComboBox *m_deviceBox;
+
+ AudioInfo *m_audioInfo;
+ QAudioDeviceInfo m_device;
+ QAudioFormat m_format;
+ QAudioInput *m_audioInput;
+ QIODevice *m_input;
+ bool m_pullMode;
+ QByteArray m_buffer;
+
+ static const QString PushModeLabel;
+ static const QString PullModeLabel;
+ static const QString SuspendLabel;
+ static const QString ResumeLabel;
};
diff --git a/examples/multimedia/audiooutput/audiooutput.cpp b/examples/multimedia/audiooutput/audiooutput.cpp
index b44accd..cbadf02 100644
--- a/examples/multimedia/audiooutput/audiooutput.cpp
+++ b/examples/multimedia/audiooutput/audiooutput.cpp
@@ -44,30 +44,34 @@
#include <QAudioOutput>
#include <QAudioDeviceInfo>
+#include <QtCore/qmath.h>
+#include <QtCore/qendian.h>
#include "audiooutput.h"
-#ifndef M_PI
-#define M_PI 3.14159265358979323846
-#endif
+const QString AudioTest::PushModeLabel(tr("Enable push mode"));
+const QString AudioTest::PullModeLabel(tr("Enable pull mode"));
+const QString AudioTest::SuspendLabel(tr("Suspend playback"));
+const QString AudioTest::ResumeLabel(tr("Resume playback"));
-#define SECONDS 1
-#define FREQ 600
-#define SYSTEM_FREQ 44100
+const int DurationSeconds = 1;
+const int ToneFrequencyHz = 600;
+const int DataFrequencyHz = 44100;
+const int BufferSize = 32768;
-Generator::Generator(QObject *parent)
- :QIODevice( parent )
+
+Generator::Generator(const QAudioFormat &format,
+ qint64 durationUs,
+ int frequency,
+ QObject *parent)
+ : QIODevice(parent)
+ , m_pos(0)
{
- finished = false;
- buffer = new char[SECONDS*SYSTEM_FREQ*4+1000];
- t=buffer;
- len=fillData(t,FREQ,SECONDS); /* mono FREQHz sine */
- pos = 0;
- total = len;
+ generateData(format, durationUs, frequency);
}
Generator::~Generator()
{
- delete [] buffer;
+
}
void Generator::start()
@@ -77,47 +81,65 @@ void Generator::start()
void Generator::stop()
{
+ m_pos = 0;
close();
}
-int Generator::putShort(char *t, unsigned int value)
+void Generator::generateData(const QAudioFormat &format, qint64 durationUs, int frequency)
{
- *(unsigned char *)(t++)=value&255;
- *(unsigned char *)(t)=(value/256)&255;
- return 2;
-}
-
-int Generator::fillData(char *start, int frequency, int seconds)
-{
- int i, len=0;
- int value;
- for(i=0; i<seconds*SYSTEM_FREQ; i++) {
- value=(int)(32767.0*sin(2.0*M_PI*((double)(i))*(double)(frequency)/SYSTEM_FREQ));
- putShort(start, value);
- start += 4;
- len+=2;
+ const int channelBytes = format.sampleSize() / 8;
+ const int sampleBytes = format.channels() * channelBytes;
+
+ qint64 length = (format.frequency() * format.channels() * (format.sampleSize() / 8))
+ * durationUs / 100000;
+
+ Q_ASSERT(length % sampleBytes == 0);
+ Q_UNUSED(sampleBytes) // suppress warning in release builds
+
+ m_buffer.resize(length);
+ unsigned char *ptr = reinterpret_cast<unsigned char *>(m_buffer.data());
+ int sampleIndex = 0;
+
+ while (length) {
+ const qreal x = qSin(2 * M_PI * frequency * qreal(sampleIndex % format.frequency()) / format.frequency());
+ for (int i=0; i<format.channels(); ++i) {
+ if (format.sampleSize() == 8 && format.sampleType() == QAudioFormat::UnSignedInt) {
+ const quint8 value = static_cast<quint8>((1.0 + x) / 2 * 255);
+ *reinterpret_cast<quint8*>(ptr) = value;
+ } else if (format.sampleSize() == 8 && format.sampleType() == QAudioFormat::SignedInt) {
+ const qint8 value = static_cast<qint8>(x * 127);
+ *reinterpret_cast<quint8*>(ptr) = value;
+ } else if (format.sampleSize() == 16 && format.sampleType() == QAudioFormat::UnSignedInt) {
+ quint16 value = static_cast<quint16>((1.0 + x) / 2 * 65535);
+ if (format.byteOrder() == QAudioFormat::LittleEndian)
+ qToLittleEndian<quint16>(value, ptr);
+ else
+ qToBigEndian<quint16>(value, ptr);
+ } else if (format.sampleSize() == 16 && format.sampleType() == QAudioFormat::SignedInt) {
+ qint16 value = static_cast<qint16>(x * 32767);
+ if (format.byteOrder() == QAudioFormat::LittleEndian)
+ qToLittleEndian<qint16>(value, ptr);
+ else
+ qToBigEndian<qint16>(value, ptr);
+ }
+
+ ptr += channelBytes;
+ length -= channelBytes;
+ }
+ ++sampleIndex;
}
- return len;
}
-qint64 Generator::readData(char *data, qint64 maxlen)
+qint64 Generator::readData(char *data, qint64 len)
{
- int len = maxlen;
- if (len > 16384)
- len = 16384;
-
- if (len < (SECONDS*SYSTEM_FREQ*2)-pos) {
- // Normal
- memcpy(data,t+pos,len);
- pos+=len;
- return len;
- } else {
- // Whats left and reset to start
- qint64 left = (SECONDS*SYSTEM_FREQ*2)-pos;
- memcpy(data,t+pos,left);
- pos=0;
- return left;
+ qint64 total = 0;
+ while (len - total) {
+ const qint64 chunk = qMin((m_buffer.size() - m_pos), len - total);
+ memcpy(data, m_buffer.constData() + m_pos, chunk);
+ m_pos = (m_pos + chunk) % m_buffer.size();
+ total += chunk;
}
+ return total;
}
qint64 Generator::writeData(const char *data, qint64 len)
@@ -128,158 +150,166 @@ qint64 Generator::writeData(const char *data, qint64 len)
return 0;
}
-AudioTest::AudioTest()
+qint64 Generator::bytesAvailable() const
{
- QWidget *window = new QWidget;
- QVBoxLayout* layout = new QVBoxLayout;
-
- deviceBox = new QComboBox(this);
- foreach (const QAudioDeviceInfo &deviceInfo, QAudioDeviceInfo::availableDevices(QAudio::AudioOutput))
- deviceBox->addItem(deviceInfo.deviceName(), qVariantFromValue(deviceInfo));
- 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(toggle()));
- layout->addWidget(button);
-
- button2 = new QPushButton(this);
- button2->setText(tr("Click To Suspend"));
- connect(button2,SIGNAL(clicked()),SLOT(togglePlay()));
- layout->addWidget(button2);
-
- window->setLayout(layout);
- setCentralWidget(window);
- window->show();
+ return m_buffer.size() + QIODevice::bytesAvailable();
+}
- buffer = new char[BUFFER_SIZE];
+AudioTest::AudioTest()
+ : m_pullTimer(new QTimer(this))
+ , m_modeButton(0)
+ , m_suspendResumeButton(0)
+ , m_deviceBox(0)
+ , m_device(QAudioDeviceInfo::defaultOutputDevice())
+ , m_generator(0)
+ , m_audioOutput(0)
+ , m_output(0)
+ , m_buffer(BufferSize, 0)
+{
+ initializeWindow();
+ initializeAudio();
+}
- gen = new Generator(this);
+void AudioTest::initializeWindow()
+{
+ QScopedPointer<QWidget> window(new QWidget);
+ QScopedPointer<QVBoxLayout> layout(new QVBoxLayout);
- pullMode = true;
+ m_deviceBox = new QComboBox(this);
+ foreach (const QAudioDeviceInfo &deviceInfo, QAudioDeviceInfo::availableDevices(QAudio::AudioOutput))
+ m_deviceBox->addItem(deviceInfo.deviceName(), qVariantFromValue(deviceInfo));
+ connect(m_deviceBox,SIGNAL(activated(int)),SLOT(deviceChanged(int)));
+ layout->addWidget(m_deviceBox);
+
+ m_modeButton = new QPushButton(this);
+ m_modeButton->setText(PushModeLabel);
+ connect(m_modeButton, SIGNAL(clicked()), SLOT(toggleMode()));
+ layout->addWidget(m_modeButton);
+
+ m_suspendResumeButton = new QPushButton(this);
+ m_suspendResumeButton->setText(SuspendLabel);
+ connect(m_suspendResumeButton, SIGNAL(clicked()), SLOT(toggleSuspendResume()));
+ layout->addWidget(m_suspendResumeButton);
+
+ window->setLayout(layout.data());
+ layout.take(); // ownership transferred
+
+ setCentralWidget(window.data());
+ QWidget *const windowPtr = window.take(); // ownership transferred
+ windowPtr->show();
+}
- timer = new QTimer(this);
- connect(timer,SIGNAL(timeout()),SLOT(writeMore()));
+void AudioTest::initializeAudio()
+{
+ connect(m_pullTimer, SIGNAL(timeout()), SLOT(pullTimerExpired()));
- gen->start();
+ m_pullMode = true;
- settings.setFrequency(SYSTEM_FREQ);
- settings.setChannels(1);
- settings.setSampleSize(16);
- settings.setCodec("audio/pcm");
- settings.setByteOrder(QAudioFormat::LittleEndian);
- settings.setSampleType(QAudioFormat::SignedInt);
+ m_format.setFrequency(DataFrequencyHz);
+ m_format.setChannels(1);
+ m_format.setSampleSize(16);
+ m_format.setCodec("audio/pcm");
+ m_format.setByteOrder(QAudioFormat::LittleEndian);
+ m_format.setSampleType(QAudioFormat::SignedInt);
QAudioDeviceInfo info(QAudioDeviceInfo::defaultOutputDevice());
- if (!info.isFormatSupported(settings)) {
- qWarning()<<"default format not supported try to use nearest";
- settings = info.nearestFormat(settings);
+ if (!info.isFormatSupported(m_format)) {
+ qWarning() << "Default format not supported - trying to use nearest";
+ m_format = info.nearestFormat(m_format);
}
- if(settings.sampleSize() != 16) {
- qWarning()<<"audio device doesn't support 16 bit samples, example cannot run";
- button->setDisabled(true);
- button2->setDisabled(true);
- audioOutput = 0;
- return;
- }
+ m_generator = new Generator(m_format, DurationSeconds*1000000, ToneFrequencyHz, this);
- audioOutput = new QAudioOutput(settings,this);
- connect(audioOutput,SIGNAL(notify()),SLOT(status()));
- connect(audioOutput,SIGNAL(stateChanged(QAudio::State)),SLOT(state(QAudio::State)));
+ createAudioOutput();
+}
- audioOutput->start(gen);
+void AudioTest::createAudioOutput()
+{
+ delete m_audioOutput;
+ m_audioOutput = 0;
+ m_audioOutput = new QAudioOutput(m_device, m_format, this);
+ connect(m_audioOutput, SIGNAL(notify()), SLOT(notified()));
+ connect(m_audioOutput, SIGNAL(stateChanged(QAudio::State)), SLOT(stateChanged(QAudio::State)));
+ m_generator->start();
+ m_audioOutput->start(m_generator);
}
AudioTest::~AudioTest()
{
- delete [] buffer;
+
}
-void AudioTest::deviceChanged(int idx)
+void AudioTest::deviceChanged(int index)
{
- timer->stop();
- gen->stop();
- audioOutput->stop();
- audioOutput->disconnect(this);
- delete audioOutput;
-
- device = deviceBox->itemData(idx).value<QAudioDeviceInfo>();
- audioOutput = new QAudioOutput(device,settings,this);
- connect(audioOutput,SIGNAL(notify()),SLOT(status()));
- connect(audioOutput,SIGNAL(stateChanged(QAudio::State)),SLOT(state(QAudio::State)));
- gen->start();
- audioOutput->start(gen);
+ m_pullTimer->stop();
+ m_generator->stop();
+ m_audioOutput->stop();
+ m_audioOutput->disconnect(this);
+ m_device = m_deviceBox->itemData(index).value<QAudioDeviceInfo>();
+ createAudioOutput();
}
-void AudioTest::status()
+void AudioTest::notified()
{
- qWarning() << "byteFree = " << audioOutput->bytesFree() << " bytes, elapsedUSecs = " << audioOutput->elapsedUSecs() << ", processedUSecs = " << audioOutput->processedUSecs();
+ qWarning() << "bytesFree = " << m_audioOutput->bytesFree()
+ << ", " << "elapsedUSecs = " << m_audioOutput->elapsedUSecs()
+ << ", " << "processedUSecs = " << m_audioOutput->processedUSecs();
}
-void AudioTest::writeMore()
+void AudioTest::pullTimerExpired()
{
- if (!audioOutput)
- return;
-
- if (audioOutput->state() == QAudio::StoppedState)
- return;
-
- int l;
- int out;
-
- int chunks = audioOutput->bytesFree()/audioOutput->periodSize();
- while(chunks) {
- l = gen->read(buffer,audioOutput->periodSize());
- if (l > 0)
- out = output->write(buffer,l);
- if (l != audioOutput->periodSize())
- break;
- chunks--;
+ if (m_audioOutput && m_audioOutput->state() != QAudio::StoppedState) {
+ int chunks = m_audioOutput->bytesFree()/m_audioOutput->periodSize();
+ while (chunks) {
+ const qint64 len = m_generator->read(m_buffer.data(), m_audioOutput->periodSize());
+ if (len)
+ m_output->write(m_buffer.data(), len);
+ if (len != m_audioOutput->periodSize())
+ break;
+ --chunks;
+ }
}
}
-void AudioTest::toggle()
+void AudioTest::toggleMode()
{
- // Change between pull and push modes
-
- timer->stop();
- audioOutput->stop();
-
- if (pullMode) {
- button->setText("Click for Pull Mode");
- output = audioOutput->start();
- pullMode = false;
- timer->start(20);
+ m_pullTimer->stop();
+ m_audioOutput->stop();
+
+ if (m_pullMode) {
+ m_modeButton->setText(PullModeLabel);
+ m_output = m_audioOutput->start();
+ m_pullMode = false;
+ m_pullTimer->start(20);
} else {
- button->setText("Click for Push Mode");
- pullMode = true;
- audioOutput->start(gen);
+ m_modeButton->setText(PushModeLabel);
+ m_pullMode = true;
+ m_audioOutput->start(m_generator);
}
+
+ m_suspendResumeButton->setText(SuspendLabel);
}
-void AudioTest::togglePlay()
+void AudioTest::toggleSuspendResume()
{
- // toggle suspend/resume
- if (audioOutput->state() == QAudio::SuspendedState) {
+ if (m_audioOutput->state() == QAudio::SuspendedState) {
qWarning() << "status: Suspended, resume()";
- audioOutput->resume();
- button2->setText("Click To Suspend");
- } else if (audioOutput->state() == QAudio::ActiveState) {
+ m_audioOutput->resume();
+ m_suspendResumeButton->setText(SuspendLabel);
+ } else if (m_audioOutput->state() == QAudio::ActiveState) {
qWarning() << "status: Active, suspend()";
- audioOutput->suspend();
- button2->setText("Click To Resume");
- } else if (audioOutput->state() == QAudio::StoppedState) {
+ m_audioOutput->suspend();
+ m_suspendResumeButton->setText(ResumeLabel);
+ } else if (m_audioOutput->state() == QAudio::StoppedState) {
qWarning() << "status: Stopped, resume()";
- audioOutput->resume();
- button2->setText("Click To Suspend");
- } else if (audioOutput->state() == QAudio::IdleState) {
+ m_audioOutput->resume();
+ m_suspendResumeButton->setText(SuspendLabel);
+ } else if (m_audioOutput->state() == QAudio::IdleState) {
qWarning() << "status: IdleState";
}
}
-void AudioTest::state(QAudio::State state)
+void AudioTest::stateChanged(QAudio::State state)
{
- qWarning() << " state=" << state;
+ qWarning() << "state = " << state;
}
diff --git a/examples/multimedia/audiooutput/audiooutput.h b/examples/multimedia/audiooutput/audiooutput.h
index 372cf78..889482b 100644
--- a/examples/multimedia/audiooutput/audiooutput.h
+++ b/examples/multimedia/audiooutput/audiooutput.h
@@ -41,14 +41,13 @@
#include <math.h>
-#define BUFFER_SIZE 32768
-
#include <QObject>
#include <QMainWindow>
#include <QIODevice>
#include <QTimer>
#include <QPushButton>
#include <QComboBox>
+#include <QByteArray>
#include <QAudioOutput>
@@ -56,26 +55,22 @@ class Generator : public QIODevice
{
Q_OBJECT
public:
- Generator(QObject *parent);
+ Generator(const QAudioFormat &format, qint64 durationUs, int frequency, QObject *parent);
~Generator();
void start();
void stop();
- char *t;
- int len;
- int pos;
- int total;
- char *buffer;
- bool finished;
- int chunk_size;
-
qint64 readData(char *data, qint64 maxlen);
qint64 writeData(const char *data, qint64 len);
+ qint64 bytesAvailable() const;
private:
- int putShort(char *t, unsigned int value);
- int fillData(char *start, int frequency, int seconds);
+ void generateData(const QAudioFormat &format, qint64 durationUs, int frequency);
+
+private:
+ qint64 m_pos;
+ QByteArray m_buffer;
};
class AudioTest : public QMainWindow
@@ -85,26 +80,39 @@ public:
AudioTest();
~AudioTest();
- QAudioDeviceInfo device;
- Generator* gen;
- QAudioOutput* audioOutput;
- QIODevice* output;
- QTimer* timer;
- QAudioFormat settings;
+private:
+ void initializeWindow();
+ void initializeAudio();
+ void createAudioOutput();
+
+private:
+ QTimer* m_pullTimer;
+
+ // Owned by layout
+ QPushButton* m_modeButton;
+ QPushButton* m_suspendResumeButton;
+ QComboBox* m_deviceBox;
+
+ QAudioDeviceInfo m_device;
+ Generator* m_generator;
+ QAudioOutput* m_audioOutput;
+ QIODevice* m_output; // not owned
+ QAudioFormat m_format;
- bool pullMode;
- char* buffer;
+ bool m_pullMode;
+ QByteArray m_buffer;
- QPushButton* button;
- QPushButton* button2;
- QComboBox* deviceBox;
+ static const QString PushModeLabel;
+ static const QString PullModeLabel;
+ static const QString SuspendLabel;
+ static const QString ResumeLabel;
private slots:
- void status();
- void writeMore();
- void toggle();
- void togglePlay();
- void state(QAudio::State s);
- void deviceChanged(int idx);
+ void notified();
+ void pullTimerExpired();
+ void toggleMode();
+ void toggleSuspendResume();
+ void stateChanged(QAudio::State state);
+ void deviceChanged(int index);
};
generated by cgit v0.12 at 2024-11-20 10:36:11 (GMT)