diff -r 06b8e2af4411 -r 6fbed849b4f4 qtmobility/examples/audiooutput/audiooutput.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/qtmobility/examples/audiooutput/audiooutput.cpp	Wed Jun 23 19:08:38 2010 +0300
@@ -0,0 +1,315 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 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 <QDebug>
+#include <QVBoxLayout>
+
+#include <qaudiooutput.h>
+#include <qaudiodeviceinfo.h>
+#include <QtCore/qmath.h>
+#include <QtCore/qendian.h>
+#include "audiooutput.h"
+
+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"));
+
+const int DurationSeconds = 1;
+const int ToneFrequencyHz = 600;
+const int DataFrequencyHz = 44100;
+const int BufferSize      = 32768;
+
+
+Generator::Generator(const QAudioFormat &format,
+                     qint64 durationUs,
+                     int frequency,
+                     QObject *parent)
+    :   QIODevice(parent)
+    ,   m_pos(0)
+{
+    generateData(format, durationUs, frequency);
+}
+
+Generator::~Generator()
+{
+
+}
+
+void Generator::start()
+{
+    open(QIODevice::ReadOnly);
+}
+
+void Generator::stop()
+{
+    m_pos = 0;
+    close();
+}
+
+void Generator::generateData(const QAudioFormat &format, qint64 durationUs, int frequency)
+{
+    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;
+    }
+}
+
+qint64 Generator::readData(char *data, qint64 len)
+{
+    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)
+{
+    Q_UNUSED(data);
+    Q_UNUSED(len);
+
+    return 0;
+}
+
+qint64 Generator::bytesAvailable() const
+{
+    return m_buffer.size() + QIODevice::bytesAvailable();
+}
+
+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();
+}
+
+void AudioTest::initializeWindow()
+{
+    QScopedPointer<QWidget> window(new QWidget);
+    QScopedPointer<QVBoxLayout> layout(new QVBoxLayout);
+
+    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();
+}
+
+void AudioTest::initializeAudio()
+{
+    connect(m_pullTimer, SIGNAL(timeout()), SLOT(pullTimerExpired()));
+
+    m_pullMode = true;
+
+    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(m_format)) {
+        qWarning() << "Default format not supported - trying to use nearest";
+        m_format = info.nearestFormat(m_format);
+    }
+
+    m_generator = new Generator(m_format, DurationSeconds*1000000, ToneFrequencyHz, this);
+
+    createAudioOutput();
+}
+
+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()
+{
+
+}
+
+void AudioTest::deviceChanged(int index)
+{
+    m_pullTimer->stop();
+    m_generator->stop();
+    m_audioOutput->stop();
+    m_audioOutput->disconnect(this);
+    m_device = m_deviceBox->itemData(index).value<QAudioDeviceInfo>();
+    createAudioOutput();
+}
+
+void AudioTest::notified()
+{
+    qWarning() << "bytesFree = " << m_audioOutput->bytesFree()
+               << ", " << "elapsedUSecs = " << m_audioOutput->elapsedUSecs()
+               << ", " << "processedUSecs = " << m_audioOutput->processedUSecs();
+}
+
+void AudioTest::pullTimerExpired()
+{
+    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::toggleMode()
+{
+    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 {
+        m_modeButton->setText(PushModeLabel);
+        m_pullMode = true;
+        m_audioOutput->start(m_generator);
+    }
+
+    m_suspendResumeButton->setText(SuspendLabel);
+}
+
+void AudioTest::toggleSuspendResume()
+{
+    if (m_audioOutput->state() == QAudio::SuspendedState) {
+        qWarning() << "status: Suspended, resume()";
+        m_audioOutput->resume();
+        m_suspendResumeButton->setText(SuspendLabel);
+    } else if (m_audioOutput->state() == QAudio::ActiveState) {
+        qWarning() << "status: Active, suspend()";
+        m_audioOutput->suspend();
+        m_suspendResumeButton->setText(ResumeLabel);
+    } else if (m_audioOutput->state() == QAudio::StoppedState) {
+        qWarning() << "status: Stopped, resume()";
+        m_audioOutput->resume();
+        m_suspendResumeButton->setText(SuspendLabel);
+    } else if (m_audioOutput->state() == QAudio::IdleState) {
+        qWarning() << "status: IdleState";
+    }
+}
+
+void AudioTest::stateChanged(QAudio::State state)
+{
+    qWarning() << "state = " << state;
+}