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qtmultimedia/examples/multimedia/audioinput/audioinput.cpp
Maurice Kalinowski b044066835 Reinitialize audio when changing device in examples 
Different devices might have different audio formats supported. Always
relying on the format of the default device can cause the audio endpoint
to not start/initialize.

Change-Id: I4d05949fd023f2cc7eb1f75db3577242e0e66680
Reviewed-by: Oliver Wolff <oliver.wolff@theqtcompany.com>
2016-03-11 07:06:49 +00:00

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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** 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 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 <stdlib.h>
#include <math.h>
#include <QDateTime>
#include <QDebug>
#include <QPainter>
#include <QVBoxLayout>
#include <QAudioDeviceInfo>
#include <QAudioInput>
#include <qendian.h>
#include "audioinput.h"
#define PUSH_MODE_LABEL "Enable push mode"
#define PULL_MODE_LABEL "Enable pull mode"
#define SUSPEND_LABEL "Suspend recording"
#define RESUME_LABEL "Resume recording"
const int BufferSize = 4096;
AudioInfo::AudioInfo(const QAudioFormat &format, QObject *parent)
: QIODevice(parent)
, m_format(format)
, m_maxAmplitude(0)
, m_level(0.0)
{
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;
}
}
AudioInfo::~AudioInfo()
{
}
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);
m_level = 0;
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()
: m_canvas(0)
, m_modeButton(0)
, m_suspendResumeButton(0)
, m_deviceBox(0)
, m_device(QAudioDeviceInfo::defaultInputDevice())
, m_audioInfo(0)
, m_audioInput(0)
, m_input(0)
, m_pullMode(true)
, m_buffer(BufferSize, 0)
{
initializeWindow();
initializeAudio();
}
InputTest::~InputTest() {}
void InputTest::initializeWindow()
{
QScopedPointer<QWidget> window(new QWidget);
QScopedPointer<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));
foreach (const QAudioDeviceInfo &deviceInfo, QAudioDeviceInfo::availableDevices(QAudio::AudioInput)) {
if (deviceInfo != defaultDeviceInfo)
m_deviceBox->addItem(deviceInfo.deviceName(), qVariantFromValue(deviceInfo));
}
connect(m_deviceBox, SIGNAL(activated(int)), SLOT(deviceChanged(int)));
layout->addWidget(m_deviceBox);
m_volumeSlider = new QSlider(Qt::Horizontal, this);
m_volumeSlider->setRange(0, 100);
m_volumeSlider->setValue(100);
connect(m_volumeSlider, SIGNAL(valueChanged(int)), SLOT(sliderChanged(int)));
layout->addWidget(m_volumeSlider);
m_modeButton = new QPushButton(this);
m_modeButton->setText(tr(PUSH_MODE_LABEL));
connect(m_modeButton, SIGNAL(clicked()), SLOT(toggleMode()));
layout->addWidget(m_modeButton);
m_suspendResumeButton = new QPushButton(this);
m_suspendResumeButton->setText(tr(SUSPEND_LABEL));
connect(m_suspendResumeButton, SIGNAL(clicked()), SLOT(toggleSuspend()));
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 InputTest::initializeAudio()
{
m_format.setSampleRate(8000);
m_format.setChannelCount(1);
m_format.setSampleSize(16);
m_format.setSampleType(QAudioFormat::SignedInt);
m_format.setByteOrder(QAudioFormat::LittleEndian);
m_format.setCodec("audio/pcm");
QAudioDeviceInfo info(m_device);
if (!info.isFormatSupported(m_format)) {
qWarning() << "Default format not supported - trying to use nearest";
m_format = info.nearestFormat(m_format);
}
if (m_audioInfo)
delete m_audioInfo;
m_audioInfo = new AudioInfo(m_format, this);
connect(m_audioInfo, SIGNAL(update()), SLOT(refreshDisplay()));
createAudioInput();
}
void InputTest::createAudioInput()
{
m_audioInput = new QAudioInput(m_device, m_format, this);
m_volumeSlider->setValue(m_audioInput->volume() * 100);
m_audioInfo->start();
m_audioInput->start(m_audioInfo);
}
void InputTest::readMore()
{
if (!m_audioInput)
return;
qint64 len = m_audioInput->bytesReady();
if (len > BufferSize)
len = BufferSize;
qint64 l = m_input->read(m_buffer.data(), len);
if (l > 0)
m_audioInfo->write(m_buffer.constData(), l);
}
void InputTest::toggleMode()
{
// Change bewteen pull and push modes
m_audioInput->stop();
if (m_pullMode) {
m_modeButton->setText(tr(PULL_MODE_LABEL));
m_input = m_audioInput->start();
connect(m_input, SIGNAL(readyRead()), SLOT(readMore()));
m_pullMode = false;
} else {
m_modeButton->setText(tr(PUSH_MODE_LABEL));
m_pullMode = true;
m_audioInput->start(m_audioInfo);
}
m_suspendResumeButton->setText(tr(SUSPEND_LABEL));
}
void InputTest::toggleSuspend()
{
// toggle suspend/resume
if (m_audioInput->state() == QAudio::SuspendedState) {
m_audioInput->resume();
m_suspendResumeButton->setText(tr(SUSPEND_LABEL));
} else if (m_audioInput->state() == QAudio::ActiveState) {
m_audioInput->suspend();
m_suspendResumeButton->setText(tr(RESUME_LABEL));
} else if (m_audioInput->state() == QAudio::StoppedState) {
m_audioInput->resume();
m_suspendResumeButton->setText(tr(SUSPEND_LABEL));
} else if (m_audioInput->state() == QAudio::IdleState) {
// no-op
}
}
void InputTest::refreshDisplay()
{
m_canvas->setLevel(m_audioInfo->level());
}
void InputTest::deviceChanged(int index)
{
m_audioInfo->stop();
m_audioInput->stop();
m_audioInput->disconnect(this);
delete m_audioInput;
m_device = m_deviceBox->itemData(index).value<QAudioDeviceInfo>();
initializeAudio();
}
void InputTest::sliderChanged(int value)
{
if (m_audioInput)
m_audioInput->setVolume(qreal(value) / 100);
}
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