--- /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;
+}