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Diffstat (limited to 'examples/audiooutput/audiooutput.cpp')
| -rw-r--r-- | examples/audiooutput/audiooutput.cpp | 334 |
1 files changed, 0 insertions, 334 deletions
diff --git a/examples/audiooutput/audiooutput.cpp b/examples/audiooutput/audiooutput.cpp deleted file mode 100644 index b8193fb..0000000 --- a/examples/audiooutput/audiooutput.cpp +++ /dev/null @@ -1,334 +0,0 @@ -/**************************************************************************** -** -** 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. -** -** $QT_BEGIN_LICENSE:BSD$ -** You may use this file under the terms of the BSD license as follows: -** -** "Redistribution and use in source and binary forms, with or without -** modification, are permitted provided that the following conditions are -** met: -** * Redistributions of source code must retain the above copyright -** notice, this list of conditions and the following disclaimer. -** * Redistributions in binary form must reproduce the above copyright -** notice, this list of conditions and the following disclaimer in -** the documentation and/or other materials provided with the -** distribution. -** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor -** the names of its contributors may be used to endorse or promote -** products derived from this software without specific prior written -** permission. -** -** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#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 QString AudioTest::VolumeLabel(tr("Volume:")); - -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 > 0) { - const qint64 chunk = qMin((m_buffer.size() - m_pos), len - total); - memcpy(data + total, 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); - - QHBoxLayout *volumeBox = new QHBoxLayout; - m_volumeLabel = new QLabel; - m_volumeLabel->setText(VolumeLabel); - m_volumeSlider = new QSlider(Qt::Horizontal); - m_volumeSlider->setMinimum(0); - m_volumeSlider->setMaximum(100); - m_volumeSlider->setSingleStep(10); - connect(m_volumeSlider, SIGNAL(valueChanged(int)), this, SLOT(volumeChanged(int))); - volumeBox->addWidget(m_volumeLabel); - volumeBox->addWidget(m_volumeSlider); - layout->addLayout(volumeBox); - - 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); - m_volumeSlider->setValue(int(m_audioOutput->volume()*100.0f)); -} - -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::volumeChanged(int value) -{ - if (m_audioOutput) - m_audioOutput->setVolume(qreal(value/100.0f)); -} - -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; -} |