qt-everywhere-src-5.14.1/qtmultimedia/examples/multimedia/audiooutput/audiooutput.cpp - orbit - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2017 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** Commercial License Usage
 ** Licensees holding valid commercial Qt licenses may use this file in
 ** accordance with the commercial license agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** BSD License Usage
 ** Alternatively, 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 The Qt Company Ltd 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 "audiooutput.h"

 #include <QAudioDeviceInfo>
 #include <QAudioOutput>
 #include <QDebug>
 #include <QVBoxLayout>
 #include <qmath.h>
 #include <qendian.h>

 Generator::Generator(const QAudioFormat &format
     , qint64 durationUs
     , int sampleRate)
 {
     if (format.isValid())
         generateData(format, durationUs, sampleRate);
 }

 void Generator::start()
 {
     open(QIODevice::ReadOnly);
 }

 void Generator::stop()
 {
     m_pos = 0;
     close();
 }

 void Generator::generateData(const QAudioFormat &format, qint64 durationUs, int sampleRate)
 {
     const int channelBytes = format.sampleSize() / 8;
     const int sampleBytes = format.channelCount() * channelBytes;
     qint64 length = (format.sampleRate() * format.channelCount() * (format.sampleSize() / 8))
                         * durationUs / 1000000;
     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) {
         // Produces value (-1..1)
         const qreal x = qSin(2 * M_PI * sampleRate * qreal(sampleIndex++ % format.sampleRate()) / format.sampleRate());
         for (int i=0; i<format.channelCount(); ++i) {
             if (format.sampleSize() == 8) {
                 if (format.sampleType() == QAudioFormat::UnSignedInt) {
                     const quint8 value = static_cast<quint8>((1.0 + x) / 2 * 255);
                     *reinterpret_cast<quint8 *>(ptr) = value;
                 } else if (format.sampleType() == QAudioFormat::SignedInt) {
                     const qint8 value = static_cast<qint8>(x * 127);
                     *reinterpret_cast<qint8 *>(ptr) = value;
                 }
             } else if (format.sampleSize() == 16) {
                 if (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.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;
         }
     }
 }

 qint64 Generator::readData(char *data, qint64 len)
 {
     qint64 total = 0;
     if (!m_buffer.isEmpty()) {
         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_pushTimer(new QTimer(this))
 {
     initializeWindow();
     initializeAudio(QAudioDeviceInfo::defaultOutputDevice());
 }

 AudioTest::~AudioTest()
 {
     m_pushTimer->stop();
 }

 void AudioTest::initializeWindow()
 {
     QWidget *window = new QWidget;
     QVBoxLayout *layout = new QVBoxLayout;

     m_deviceBox = new QComboBox(this);
     const QAudioDeviceInfo &defaultDeviceInfo = QAudioDeviceInfo::defaultOutputDevice();
     m_deviceBox->addItem(defaultDeviceInfo.deviceName(), QVariant::fromValue(defaultDeviceInfo));
     for (auto &deviceInfo: QAudioDeviceInfo::availableDevices(QAudio::AudioOutput)) {
         if (deviceInfo != defaultDeviceInfo)
             m_deviceBox->addItem(deviceInfo.deviceName(), QVariant::fromValue(deviceInfo));
     }
     connect(m_deviceBox, QOverload<int>::of(&QComboBox::activated), this, &AudioTest::deviceChanged);
     layout->addWidget(m_deviceBox);

     m_modeButton = new QPushButton(this);
     connect(m_modeButton, &QPushButton::clicked, this, &AudioTest::toggleMode);
     layout->addWidget(m_modeButton);

     m_suspendResumeButton = new QPushButton(this);
     connect(m_suspendResumeButton, &QPushButton::clicked, this, &AudioTest::toggleSuspendResume);
     layout->addWidget(m_suspendResumeButton);

     QHBoxLayout *volumeBox = new QHBoxLayout;
     m_volumeLabel = new QLabel;
     m_volumeLabel->setText(tr("Volume:"));
     m_volumeSlider = new QSlider(Qt::Horizontal);
     m_volumeSlider->setMinimum(0);
     m_volumeSlider->setMaximum(100);
     m_volumeSlider->setSingleStep(10);
     connect(m_volumeSlider, &QSlider::valueChanged, this, &AudioTest::volumeChanged);
     volumeBox->addWidget(m_volumeLabel);
     volumeBox->addWidget(m_volumeSlider);
     layout->addLayout(volumeBox);

     window->setLayout(layout);

     setCentralWidget(window);
     window->show();
 }

 void AudioTest::initializeAudio(const QAudioDeviceInfo &deviceInfo)
 {
     QAudioFormat format;
     format.setSampleRate(44100);
     format.setChannelCount(1);
     format.setSampleSize(16);
     format.setCodec("audio/pcm");
     format.setByteOrder(QAudioFormat::LittleEndian);
     format.setSampleType(QAudioFormat::SignedInt);

     if (!deviceInfo.isFormatSupported(format)) {
         qWarning() << "Default format not supported - trying to use nearest";
         format = deviceInfo.nearestFormat(format);
     }

     const int durationSeconds = 1;
     const int toneSampleRateHz = 600;
     m_generator.reset(new Generator(format, durationSeconds * 1000000, toneSampleRateHz));
     m_audioOutput.reset(new QAudioOutput(deviceInfo, format));
     m_generator->start();

     qreal initialVolume = QAudio::convertVolume(m_audioOutput->volume(),
                                                 QAudio::LinearVolumeScale,
                                                 QAudio::LogarithmicVolumeScale);
     m_volumeSlider->setValue(qRound(initialVolume * 100));
     toggleMode();
 }

 void AudioTest::deviceChanged(int index)
 {
     m_generator->stop();
     m_audioOutput->stop();
     m_audioOutput->disconnect(this);
     initializeAudio(m_deviceBox->itemData(index).value<QAudioDeviceInfo>());
 }

 void AudioTest::volumeChanged(int value)
 {
     qreal linearVolume = QAudio::convertVolume(value / qreal(100),
                                                QAudio::LogarithmicVolumeScale,
                                                QAudio::LinearVolumeScale);

     m_audioOutput->setVolume(linearVolume);
 }

 void AudioTest::toggleMode()
 {
     m_pushTimer->stop();
     m_audioOutput->stop();
     toggleSuspendResume();

     if (m_pullMode) {
         //switch to pull mode (QAudioOutput pulls from Generator as needed)
         m_modeButton->setText(tr("Enable push mode"));
         m_audioOutput->start(m_generator.data());
     } else {
         //switch to push mode (periodically push to QAudioOutput using a timer)
         m_modeButton->setText(tr("Enable pull mode"));
         auto io = m_audioOutput->start();
         m_pushTimer->disconnect();

         connect(m_pushTimer, &QTimer::timeout, [this, io]() {
             if (m_audioOutput->state() == QAudio::StoppedState)
                 return;

             QByteArray buffer(32768, 0);
             int chunks = m_audioOutput->bytesFree() / m_audioOutput->periodSize();
             while (chunks) {
                const qint64 len = m_generator->read(buffer.data(), m_audioOutput->periodSize());
                if (len)
                    io->write(buffer.data(), len);
                if (len != m_audioOutput->periodSize())
                    break;
                --chunks;
             }
         });

         m_pushTimer->start(20);
     }

     m_pullMode = !m_pullMode;
 }

 void AudioTest::toggleSuspendResume()
 {
     if (m_audioOutput->state() == QAudio::SuspendedState || m_audioOutput->state() == QAudio::StoppedState) {
         m_audioOutput->resume();
         m_suspendResumeButton->setText(tr("Suspend recording"));
     } else if (m_audioOutput->state() == QAudio::ActiveState) {
         m_audioOutput->suspend();
         m_suspendResumeButton->setText(tr("Resume playback"));
     } else if (m_audioOutput->state() == QAudio::IdleState) {
         // no-op
     }
 }
	/****************************************************************************
	**
	** Copyright (C) 2017 The Qt Company Ltd.
	** Contact: https://www.qt.io/licensing/
	**
	** This file is part of the examples of the Qt Toolkit.
	**
	** $QT_BEGIN_LICENSE:BSD$
	** Commercial License Usage
	** Licensees holding valid commercial Qt licenses may use this file in
	** accordance with the commercial license agreement provided with the
	** Software or, alternatively, in accordance with the terms contained in
	** a written agreement between you and The Qt Company. For licensing terms
	** and conditions see https://www.qt.io/terms-conditions. For further
	** information use the contact form at https://www.qt.io/contact-us.
	**
	** BSD License Usage
	** Alternatively, 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 The Qt Company Ltd 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 "audiooutput.h"

	#include <QAudioDeviceInfo>
	#include <QAudioOutput>
	#include <QDebug>
	#include <QVBoxLayout>
	#include <qmath.h>
	#include <qendian.h>

	Generator::Generator(const QAudioFormat &format
	, qint64 durationUs
	, int sampleRate)
	{
	if (format.isValid())
	generateData(format, durationUs, sampleRate);
	}

	void Generator::start()
	{
	open(QIODevice::ReadOnly);
	}

	void Generator::stop()
	{
	m_pos = 0;
	close();
	}

	void Generator::generateData(const QAudioFormat &format, qint64 durationUs, int sampleRate)
	{
	const int channelBytes = format.sampleSize() / 8;
	const int sampleBytes = format.channelCount() * channelBytes;
	qint64 length = (format.sampleRate() * format.channelCount() * (format.sampleSize() / 8))
	* durationUs / 1000000;
	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) {
	// Produces value (-1..1)
	const qreal x = qSin(2 * M_PI * sampleRate * qreal(sampleIndex++ % format.sampleRate()) / format.sampleRate());
	for (int i=0; i<format.channelCount(); ++i) {
	if (format.sampleSize() == 8) {
	if (format.sampleType() == QAudioFormat::UnSignedInt) {
	const quint8 value = static_cast<quint8>((1.0 + x) / 2 * 255);
	reinterpret_cast<quint8 >(ptr) = value;
	} else if (format.sampleType() == QAudioFormat::SignedInt) {
	const qint8 value = static_cast<qint8>(x * 127);
	reinterpret_cast<qint8 >(ptr) = value;
	}
	} else if (format.sampleSize() == 16) {
	if (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.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;
	}
	}
	}

	qint64 Generator::readData(char *data, qint64 len)
	{
	qint64 total = 0;
	if (!m_buffer.isEmpty()) {
	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_pushTimer(new QTimer(this))
	{
	initializeWindow();
	initializeAudio(QAudioDeviceInfo::defaultOutputDevice());
	}

	AudioTest::~AudioTest()
	{
	m_pushTimer->stop();
	}

	void AudioTest::initializeWindow()
	{
	QWidget *window = new QWidget;
	QVBoxLayout *layout = new QVBoxLayout;

	m_deviceBox = new QComboBox(this);
	const QAudioDeviceInfo &defaultDeviceInfo = QAudioDeviceInfo::defaultOutputDevice();
	m_deviceBox->addItem(defaultDeviceInfo.deviceName(), QVariant::fromValue(defaultDeviceInfo));
	for (auto &deviceInfo: QAudioDeviceInfo::availableDevices(QAudio::AudioOutput)) {
	if (deviceInfo != defaultDeviceInfo)
	m_deviceBox->addItem(deviceInfo.deviceName(), QVariant::fromValue(deviceInfo));
	}
	connect(m_deviceBox, QOverload<int>::of(&QComboBox::activated), this, &AudioTest::deviceChanged);
	layout->addWidget(m_deviceBox);

	m_modeButton = new QPushButton(this);
	connect(m_modeButton, &QPushButton::clicked, this, &AudioTest::toggleMode);
	layout->addWidget(m_modeButton);

	m_suspendResumeButton = new QPushButton(this);
	connect(m_suspendResumeButton, &QPushButton::clicked, this, &AudioTest::toggleSuspendResume);
	layout->addWidget(m_suspendResumeButton);

	QHBoxLayout *volumeBox = new QHBoxLayout;
	m_volumeLabel = new QLabel;
	m_volumeLabel->setText(tr("Volume:"));
	m_volumeSlider = new QSlider(Qt::Horizontal);
	m_volumeSlider->setMinimum(0);
	m_volumeSlider->setMaximum(100);
	m_volumeSlider->setSingleStep(10);
	connect(m_volumeSlider, &QSlider::valueChanged, this, &AudioTest::volumeChanged);
	volumeBox->addWidget(m_volumeLabel);
	volumeBox->addWidget(m_volumeSlider);
	layout->addLayout(volumeBox);

	window->setLayout(layout);

	setCentralWidget(window);
	window->show();
	}

	void AudioTest::initializeAudio(const QAudioDeviceInfo &deviceInfo)
	{
	QAudioFormat format;
	format.setSampleRate(44100);
	format.setChannelCount(1);
	format.setSampleSize(16);
	format.setCodec("audio/pcm");
	format.setByteOrder(QAudioFormat::LittleEndian);
	format.setSampleType(QAudioFormat::SignedInt);

	if (!deviceInfo.isFormatSupported(format)) {
	qWarning() << "Default format not supported - trying to use nearest";
	format = deviceInfo.nearestFormat(format);
	}

	const int durationSeconds = 1;
	const int toneSampleRateHz = 600;
	m_generator.reset(new Generator(format, durationSeconds * 1000000, toneSampleRateHz));
	m_audioOutput.reset(new QAudioOutput(deviceInfo, format));
	m_generator->start();

	qreal initialVolume = QAudio::convertVolume(m_audioOutput->volume(),
	QAudio::LinearVolumeScale,
	QAudio::LogarithmicVolumeScale);
	m_volumeSlider->setValue(qRound(initialVolume * 100));
	toggleMode();
	}

	void AudioTest::deviceChanged(int index)
	{
	m_generator->stop();
	m_audioOutput->stop();
	m_audioOutput->disconnect(this);
	initializeAudio(m_deviceBox->itemData(index).value<QAudioDeviceInfo>());
	}

	void AudioTest::volumeChanged(int value)
	{
	qreal linearVolume = QAudio::convertVolume(value / qreal(100),
	QAudio::LogarithmicVolumeScale,
	QAudio::LinearVolumeScale);

	m_audioOutput->setVolume(linearVolume);
	}

	void AudioTest::toggleMode()
	{
	m_pushTimer->stop();
	m_audioOutput->stop();
	toggleSuspendResume();

	if (m_pullMode) {
	//switch to pull mode (QAudioOutput pulls from Generator as needed)
	m_modeButton->setText(tr("Enable push mode"));
	m_audioOutput->start(m_generator.data());
	} else {
	//switch to push mode (periodically push to QAudioOutput using a timer)
	m_modeButton->setText(tr("Enable pull mode"));
	auto io = m_audioOutput->start();
	m_pushTimer->disconnect();

	connect(m_pushTimer, &QTimer::timeout, [this, io]() {
	if (m_audioOutput->state() == QAudio::StoppedState)
	return;

	QByteArray buffer(32768, 0);
	int chunks = m_audioOutput->bytesFree() / m_audioOutput->periodSize();
	while (chunks) {
	const qint64 len = m_generator->read(buffer.data(), m_audioOutput->periodSize());
	if (len)
	io->write(buffer.data(), len);
	if (len != m_audioOutput->periodSize())
	break;
	--chunks;
	}
	});

	m_pushTimer->start(20);
	}

	m_pullMode = !m_pullMode;
	}

	void AudioTest::toggleSuspendResume()
	{
	if (m_audioOutput->state() == QAudio::SuspendedState \|\| m_audioOutput->state() == QAudio::StoppedState) {
	m_audioOutput->resume();
	m_suspendResumeButton->setText(tr("Suspend recording"));
	} else if (m_audioOutput->state() == QAudio::ActiveState) {
	m_audioOutput->suspend();
	m_suspendResumeButton->setText(tr("Resume playback"));
	} else if (m_audioOutput->state() == QAudio::IdleState) {
	// no-op
	}
	}