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50
51#include "audioinput.h"
52
53#include <stdlib.h>
54#include <math.h>
55
56#include <QDateTime>
57#include <QDebug>
58#include <QPainter>
59#include <QVBoxLayout>
60#include <QAudioDeviceInfo>
61#include <QAudioInput>
62#include <qendian.h>
63
64AudioInfo::AudioInfo(const QAudioFormat &format)
65 : m_format(format)
66{
67 switch (m_format.sampleSize()) {
68 case 8:
69 switch (m_format.sampleType()) {
70 case QAudioFormat::UnSignedInt:
71 m_maxAmplitude = 255;
72 break;
73 case QAudioFormat::SignedInt:
74 m_maxAmplitude = 127;
75 break;
76 default:
77 break;
78 }
79 break;
80 case 16:
81 switch (m_format.sampleType()) {
82 case QAudioFormat::UnSignedInt:
83 m_maxAmplitude = 65535;
84 break;
85 case QAudioFormat::SignedInt:
86 m_maxAmplitude = 32767;
87 break;
88 default:
89 break;
90 }
91 break;
92
93 case 32:
94 switch (m_format.sampleType()) {
95 case QAudioFormat::UnSignedInt:
96 m_maxAmplitude = 0xffffffff;
97 break;
98 case QAudioFormat::SignedInt:
99 m_maxAmplitude = 0x7fffffff;
100 break;
101 case QAudioFormat::Float:
102 m_maxAmplitude = 0x7fffffff; // Kind of
103 default:
104 break;
105 }
106 break;
107
108 default:
109 break;
110 }
111}
112
113void AudioInfo::start()
114{
115 open(mode: QIODevice::WriteOnly);
116}
117
118void AudioInfo::stop()
119{
120 close();
121}
122
123qint64 AudioInfo::readData(char *data, qint64 maxlen)
124{
125 Q_UNUSED(data)
126 Q_UNUSED(maxlen)
127
128 return 0;
129}
130
131qint64 AudioInfo::writeData(const char *data, qint64 len)
132{
133 if (m_maxAmplitude) {
134 Q_ASSERT(m_format.sampleSize() % 8 == 0);
135 const int channelBytes = m_format.sampleSize() / 8;
136 const int sampleBytes = m_format.channelCount() * channelBytes;
137 Q_ASSERT(len % sampleBytes == 0);
138 const int numSamples = len / sampleBytes;
139
140 quint32 maxValue = 0;
141 const unsigned char *ptr = reinterpret_cast<const unsigned char *>(data);
142
143 for (int i = 0; i < numSamples; ++i) {
144 for (int j = 0; j < m_format.channelCount(); ++j) {
145 quint32 value = 0;
146
147 if (m_format.sampleSize() == 8 && m_format.sampleType() == QAudioFormat::UnSignedInt) {
148 value = *reinterpret_cast<const quint8*>(ptr);
149 } else if (m_format.sampleSize() == 8 && m_format.sampleType() == QAudioFormat::SignedInt) {
150 value = qAbs(t: *reinterpret_cast<const qint8*>(ptr));
151 } else if (m_format.sampleSize() == 16 && m_format.sampleType() == QAudioFormat::UnSignedInt) {
152 if (m_format.byteOrder() == QAudioFormat::LittleEndian)
153 value = qFromLittleEndian<quint16>(src: ptr);
154 else
155 value = qFromBigEndian<quint16>(src: ptr);
156 } else if (m_format.sampleSize() == 16 && m_format.sampleType() == QAudioFormat::SignedInt) {
157 if (m_format.byteOrder() == QAudioFormat::LittleEndian)
158 value = qAbs(t: qFromLittleEndian<qint16>(src: ptr));
159 else
160 value = qAbs(t: qFromBigEndian<qint16>(src: ptr));
161 } else if (m_format.sampleSize() == 32 && m_format.sampleType() == QAudioFormat::UnSignedInt) {
162 if (m_format.byteOrder() == QAudioFormat::LittleEndian)
163 value = qFromLittleEndian<quint32>(src: ptr);
164 else
165 value = qFromBigEndian<quint32>(src: ptr);
166 } else if (m_format.sampleSize() == 32 && m_format.sampleType() == QAudioFormat::SignedInt) {
167 if (m_format.byteOrder() == QAudioFormat::LittleEndian)
168 value = qAbs(t: qFromLittleEndian<qint32>(src: ptr));
169 else
170 value = qAbs(t: qFromBigEndian<qint32>(src: ptr));
171 } else if (m_format.sampleSize() == 32 && m_format.sampleType() == QAudioFormat::Float) {
172 value = qAbs(t: *reinterpret_cast<const float*>(ptr) * 0x7fffffff); // assumes 0-1.0
173 }
174
175 maxValue = qMax(a: value, b: maxValue);
176 ptr += channelBytes;
177 }
178 }
179
180 maxValue = qMin(a: maxValue, b: m_maxAmplitude);
181 m_level = qreal(maxValue) / m_maxAmplitude;
182 }
183
184 emit update();
185 return len;
186}
187
188RenderArea::RenderArea(QWidget *parent)
189 : QWidget(parent)
190{
191 setBackgroundRole(QPalette::Base);
192 setAutoFillBackground(true);
193
194 setMinimumHeight(30);
195 setMinimumWidth(200);
196}
197
198void RenderArea::paintEvent(QPaintEvent * /* event */)
199{
200 QPainter painter(this);
201
202 painter.setPen(Qt::black);
203 painter.drawRect(r: QRect(painter.viewport().left()+10,
204 painter.viewport().top()+10,
205 painter.viewport().right()-20,
206 painter.viewport().bottom()-20));
207 if (m_level == 0.0)
208 return;
209
210 int pos = ((painter.viewport().right()-20)-(painter.viewport().left()+11))*m_level;
211 painter.fillRect(x: painter.viewport().left()+11,
212 y: painter.viewport().top()+10,
213 w: pos,
214 h: painter.viewport().height()-21,
215 c: Qt::red);
216}
217
218void RenderArea::setLevel(qreal value)
219{
220 m_level = value;
221 update();
222}
223
224
225InputTest::InputTest()
226{
227 initializeWindow();
228 initializeAudio(deviceInfo: QAudioDeviceInfo::defaultInputDevice());
229}
230
231
232void InputTest::initializeWindow()
233{
234 QWidget *window = new QWidget;
235 QVBoxLayout *layout = new QVBoxLayout;
236
237 m_canvas = new RenderArea(this);
238 layout->addWidget(m_canvas);
239
240 m_deviceBox = new QComboBox(this);
241 const QAudioDeviceInfo &defaultDeviceInfo = QAudioDeviceInfo::defaultInputDevice();
242 m_deviceBox->addItem(atext: defaultDeviceInfo.deviceName(), auserData: QVariant::fromValue(value: defaultDeviceInfo));
243 for (auto &deviceInfo: QAudioDeviceInfo::availableDevices(mode: QAudio::AudioInput)) {
244 if (deviceInfo != defaultDeviceInfo)
245 m_deviceBox->addItem(atext: deviceInfo.deviceName(), auserData: QVariant::fromValue(value: deviceInfo));
246 }
247
248 connect(sender: m_deviceBox, signal: QOverload<int>::of(ptr: &QComboBox::activated), receiver: this, slot: &InputTest::deviceChanged);
249 layout->addWidget(m_deviceBox);
250
251 m_volumeSlider = new QSlider(Qt::Horizontal, this);
252 m_volumeSlider->setRange(min: 0, max: 100);
253 m_volumeSlider->setValue(100);
254 connect(sender: m_volumeSlider, signal: &QSlider::valueChanged, receiver: this, slot: &InputTest::sliderChanged);
255 layout->addWidget(m_volumeSlider);
256
257 m_modeButton = new QPushButton(this);
258 connect(sender: m_modeButton, signal: &QPushButton::clicked, receiver: this, slot: &InputTest::toggleMode);
259 layout->addWidget(m_modeButton);
260
261 m_suspendResumeButton = new QPushButton(this);
262 connect(sender: m_suspendResumeButton, signal: &QPushButton::clicked, receiver: this, slot: &InputTest::toggleSuspend);
263 layout->addWidget(m_suspendResumeButton);
264
265 window->setLayout(layout);
266
267 setCentralWidget(window);
268 window->show();
269}
270
271void InputTest::initializeAudio(const QAudioDeviceInfo &deviceInfo)
272{
273 QAudioFormat format;
274 format.setSampleRate(8000);
275 format.setChannelCount(1);
276 format.setSampleSize(16);
277 format.setSampleType(QAudioFormat::SignedInt);
278 format.setByteOrder(QAudioFormat::LittleEndian);
279 format.setCodec("audio/pcm");
280
281 if (!deviceInfo.isFormatSupported(format)) {
282 qWarning() << "Default format not supported - trying to use nearest";
283 format = deviceInfo.nearestFormat(format);
284 }
285
286 m_audioInfo.reset(other: new AudioInfo(format));
287 connect(sender: m_audioInfo.data(), signal: &AudioInfo::update, slot: [this]() {
288 m_canvas->setLevel(m_audioInfo->level());
289 });
290
291 m_audioInput.reset(other: new QAudioInput(deviceInfo, format));
292 qreal initialVolume = QAudio::convertVolume(volume: m_audioInput->volume(),
293 from: QAudio::LinearVolumeScale,
294 to: QAudio::LogarithmicVolumeScale);
295 m_volumeSlider->setValue(qRound(d: initialVolume * 100));
296 m_audioInfo->start();
297 toggleMode();
298}
299
300void InputTest::toggleMode()
301{
302 m_audioInput->stop();
303 toggleSuspend();
304
305 // Change bewteen pull and push modes
306 if (m_pullMode) {
307 m_modeButton->setText(tr(s: "Enable push mode"));
308 m_audioInput->start(device: m_audioInfo.data());
309 } else {
310 m_modeButton->setText(tr(s: "Enable pull mode"));
311 auto io = m_audioInput->start();
312 connect(sender: io, signal: &QIODevice::readyRead,
313 slot: [&, io]() {
314 qint64 len = m_audioInput->bytesReady();
315 const int BufferSize = 4096;
316 if (len > BufferSize)
317 len = BufferSize;
318
319 QByteArray buffer(len, 0);
320 qint64 l = io->read(data: buffer.data(), maxlen: len);
321 if (l > 0)
322 m_audioInfo->write(data: buffer.constData(), len: l);
323 });
324 }
325
326 m_pullMode = !m_pullMode;
327}
328
329void InputTest::toggleSuspend()
330{
331 // toggle suspend/resume
332 if (m_audioInput->state() == QAudio::SuspendedState || m_audioInput->state() == QAudio::StoppedState) {
333 m_audioInput->resume();
334 m_suspendResumeButton->setText(tr(s: "Suspend recording"));
335 } else if (m_audioInput->state() == QAudio::ActiveState) {
336 m_audioInput->suspend();
337 m_suspendResumeButton->setText(tr(s: "Resume recording"));
338 } else if (m_audioInput->state() == QAudio::IdleState) {
339 // no-op
340 }
341}
342
343void InputTest::deviceChanged(int index)
344{
345 m_audioInfo->stop();
346 m_audioInput->stop();
347 m_audioInput->disconnect(receiver: this);
348
349 initializeAudio(deviceInfo: m_deviceBox->itemData(index).value<QAudioDeviceInfo>());
350}
351
352void InputTest::sliderChanged(int value)
353{
354 qreal linearVolume = QAudio::convertVolume(volume: value / qreal(100),
355 from: QAudio::LogarithmicVolumeScale,
356 to: QAudio::LinearVolumeScale);
357
358 m_audioInput->setVolume(linearVolume);
359}
360

source code of qtmultimedia/examples/multimedia/audioinput/audioinput.cpp