audioinput.cpp Example File

multimedia/audioinput/audioinput.cpp
/**************************************************************************** ** ** 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 "audioinput.h" #include <stdlib.h> #include <math.h> #include <QDateTime> #include <QDebug> #include <QPainter> #include <QVBoxLayout> #include <QAudioDeviceInfo> #include <QAudioInput> #include <qendian.h> AudioInfo::AudioInfo(const QAudioFormat &format) : m_format(format) { switch (m_format.sampleSize()) { case 8: switch (m_format.sampleType()) { case QAudioFormat::UnSignedInt: m_maxAmplitude = 255; break; case QAudioFormat::SignedInt: m_maxAmplitude = 127; break; default: break; } break; case 16: switch (m_format.sampleType()) { case QAudioFormat::UnSignedInt: m_maxAmplitude = 65535; break; case QAudioFormat::SignedInt: m_maxAmplitude = 32767; break; default: break; } break; case 32: switch (m_format.sampleType()) { case QAudioFormat::UnSignedInt: m_maxAmplitude = 0xffffffff; break; case QAudioFormat::SignedInt: m_maxAmplitude = 0x7fffffff; break; case QAudioFormat::Float: m_maxAmplitude = 0x7fffffff; // Kind of default: break; } break; default: break; } } void AudioInfo::start() { open(QIODevice::WriteOnly); } void AudioInfo::stop() { close(); } qint64 AudioInfo::readData(char *data, qint64 maxlen) { Q_UNUSED(data) Q_UNUSED(maxlen) return 0; } qint64 AudioInfo::writeData(const char *data, qint64 len) { if (m_maxAmplitude) { Q_ASSERT(m_format.sampleSize() % 8 == 0); const int channelBytes = m_format.sampleSize() / 8; const int sampleBytes = m_format.channelCount() * channelBytes; Q_ASSERT(len % sampleBytes == 0); const int numSamples = len / sampleBytes; quint32 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.channelCount(); ++j) { quint32 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)); } else if (m_format.sampleSize() == 32 && m_format.sampleType() == QAudioFormat::UnSignedInt) { if (m_format.byteOrder() == QAudioFormat::LittleEndian) value = qFromLittleEndian<quint32>(ptr); else value = qFromBigEndian<quint32>(ptr); } else if (m_format.sampleSize() == 32 && m_format.sampleType() == QAudioFormat::SignedInt) { if (m_format.byteOrder() == QAudioFormat::LittleEndian) value = qAbs(qFromLittleEndian<qint32>(ptr)); else value = qAbs(qFromBigEndian<qint32>(ptr)); } else if (m_format.sampleSize() == 32 && m_format.sampleType() == QAudioFormat::Float) { value = qAbs(*reinterpret_cast<const float*>(ptr) * 0x7fffffff); // assumes 0-1.0 } maxValue = qMax(value, maxValue); ptr += channelBytes; } } maxValue = qMin(maxValue, m_maxAmplitude); m_level = qreal(maxValue) / m_maxAmplitude; } emit update(); return len; } RenderArea::RenderArea(QWidget *parent) : QWidget(parent) { setBackgroundRole(QPalette::Base); setAutoFillBackground(true); setMinimumHeight(30); setMinimumWidth(200); } void RenderArea::paintEvent(QPaintEvent * /* event */) { QPainter painter(this); painter.setPen(Qt::black); painter.drawRect(QRect(painter.viewport().left()+10, painter.viewport().top()+10, painter.viewport().right()-20, painter.viewport().bottom()-20)); if (m_level == 0.0) return; int pos = ((painter.viewport().right()-20)-(painter.viewport().left()+11))*m_level; painter.fillRect(painter.viewport().left()+11, painter.viewport().top()+10, pos, painter.viewport().height()-21, Qt::red); } void RenderArea::setLevel(qreal value) { m_level = value; update(); } InputTest::InputTest() { initializeWindow(); initializeAudio(QAudioDeviceInfo::defaultInputDevice()); } void InputTest::initializeWindow() { QWidget *window = new QWidget; QVBoxLayout *layout = new QVBoxLayout; m_canvas = new RenderArea(this); layout->addWidget(m_canvas); m_deviceBox = new QComboBox(this); const QAudioDeviceInfo &defaultDeviceInfo = QAudioDeviceInfo::defaultInputDevice(); m_deviceBox->addItem(defaultDeviceInfo.deviceName(), qVariantFromValue(defaultDeviceInfo)); for (auto &deviceInfo: QAudioDeviceInfo::availableDevices(QAudio::AudioInput)) { if (deviceInfo != defaultDeviceInfo) m_deviceBox->addItem(deviceInfo.deviceName(), qVariantFromValue(deviceInfo)); } connect(m_deviceBox, QOverload<int>::of(&QComboBox::activated), this, &InputTest::deviceChanged); layout->addWidget(m_deviceBox); m_volumeSlider = new QSlider(Qt::Horizontal, this); m_volumeSlider->setRange(0, 100); m_volumeSlider->setValue(100); connect(m_volumeSlider, &QSlider::valueChanged, this, &InputTest::sliderChanged); layout->addWidget(m_volumeSlider); m_modeButton = new QPushButton(this); connect(m_modeButton, &QPushButton::clicked, this, &InputTest::toggleMode); layout->addWidget(m_modeButton); m_suspendResumeButton = new QPushButton(this); connect(m_suspendResumeButton, &QPushButton::clicked, this, &InputTest::toggleSuspend); layout->addWidget(m_suspendResumeButton); window->setLayout(layout); setCentralWidget(window); window->show(); } void InputTest::initializeAudio(const QAudioDeviceInfo &deviceInfo) { QAudioFormat format; format.setSampleRate(8000); format.setChannelCount(1); format.setSampleSize(16); format.setSampleType(QAudioFormat::SignedInt); format.setByteOrder(QAudioFormat::LittleEndian); format.setCodec("audio/pcm"); if (!deviceInfo.isFormatSupported(format)) { qWarning() << "Default format not supported - trying to use nearest"; format = deviceInfo.nearestFormat(format); } m_audioInfo.reset(new AudioInfo(format)); connect(m_audioInfo.data(), &AudioInfo::update, [this]() { m_canvas->setLevel(m_audioInfo->level()); }); m_audioInput.reset(new QAudioInput(deviceInfo, format)); qreal initialVolume = QAudio::convertVolume(m_audioInput->volume(), QAudio::LinearVolumeScale, QAudio::LogarithmicVolumeScale); m_volumeSlider->setValue(qRound(initialVolume * 100)); m_audioInfo->start(); toggleMode(); } void InputTest::toggleMode() { m_audioInput->stop(); toggleSuspend(); // Change bewteen pull and push modes if (m_pullMode) { m_modeButton->setText(tr("Enable push mode")); m_audioInput->start(m_audioInfo.data()); } else { m_modeButton->setText(tr("Enable pull mode")); auto io = m_audioInput->start(); connect(io, &QIODevice::readyRead, [&, io]() { qint64 len = m_audioInput->bytesReady(); const int BufferSize = 4096; if (len > BufferSize) len = BufferSize; QByteArray buffer(len, 0); qint64 l = io->read(buffer.data(), len); if (l > 0) m_audioInfo->write(buffer.constData(), l); }); } m_pullMode = !m_pullMode; } void InputTest::toggleSuspend() { // toggle suspend/resume if (m_audioInput->state() == QAudio::SuspendedState || m_audioInput->state() == QAudio::StoppedState) { m_audioInput->resume(); m_suspendResumeButton->setText(tr("Suspend recording")); } else if (m_audioInput->state() == QAudio::ActiveState) { m_audioInput->suspend(); m_suspendResumeButton->setText(tr("Resume recording")); } else if (m_audioInput->state() == QAudio::IdleState) { // no-op } } void InputTest::deviceChanged(int index) { m_audioInfo->stop(); m_audioInput->stop(); m_audioInput->disconnect(this); initializeAudio(m_deviceBox->itemData(index).value<QAudioDeviceInfo>()); } void InputTest::sliderChanged(int value) { qreal linearVolume = QAudio::convertVolume(value / qreal(100), QAudio::LogarithmicVolumeScale, QAudio::LinearVolumeScale); m_audioInput->setVolume(linearVolume); }

© 2020 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.