#include <qaudiorecorder.h>
#include <qmediarecorder.h>
+#include <qaudioprobe.h>
#include "audiorecorder.h"
ui->setupUi(this);
audioRecorder = new QAudioRecorder(this);
+ probe = new QAudioProbe;
+ connect(probe, SIGNAL(audioBufferProbed(const QAudioBuffer&)), this, SLOT(processBuffer(QAudioBuffer)));
+ probe->setSource(audioRecorder);
//audio devices
ui->audioDeviceBox->addItem(tr("Default"), QVariant(QString()));
SLOT(updateState(QMediaRecorder::State)));
connect(audioRecorder, SIGNAL(error(QMediaRecorder::Error)), this,
SLOT(displayErrorMessage()));
- }
+}
AudioRecorder::~AudioRecorder()
{
delete audioRecorder;
+ delete probe;
}
void AudioRecorder::updateProgress(qint64 duration)
QUrl location(QDir::toNativeSeparators(outputDir.canonicalPath() + QString("/testclip_%1").arg(lastImage + 1, 4, 10, QLatin1Char('0'))));
return location;
}
+
+// This function returns the maximum possible sample value for a given audio format
+qreal AudioRecorder::GetPeakValue(const QAudioFormat& format)
+{
+ // Note: Only the most common sample formats are supported
+ if (!format.isValid())
+ return 0.0;
+
+ if (format.codec() != "audio/pcm")
+ return 0.0;
+
+ switch (format.sampleType()) {
+ case QAudioFormat::Unknown:
+ break;
+ case QAudioFormat::Float:
+ if (format.sampleSize() != 32) // other sample formats are not supported
+ return 0.0;
+ return 1.00003;
+ case QAudioFormat::SignedInt:
+ if (format.sampleSize() == 32)
+ return 2147483648.0;
+ else if (format.sampleSize() == 16)
+ return 32768.0;
+ else if (format.sampleSize() == 8)
+ return 128.0;
+ break;
+ case QAudioFormat::UnSignedInt:
+ // Unsigned formats are not supported in this example
+ break;
+ }
+
+ return 0.0;
+}
+
+qreal AudioRecorder::GetBufferLevel(const QAudioBuffer& buffer)
+{
+ if (!buffer.format().isValid() || buffer.format().byteOrder() != QAudioFormat::LittleEndian)
+ return 0.0;
+
+ if (buffer.format().codec() != "audio/pcm")
+ return 0.0;
+
+ qreal peak_value = GetPeakValue(buffer.format());
+ if (qFuzzyCompare(peak_value, 0.0))
+ return 0.0;
+
+ switch (buffer.format().sampleType()) {
+ case QAudioFormat::Unknown:
+ case QAudioFormat::UnSignedInt:
+ break;
+ case QAudioFormat::Float:
+ if (buffer.format().sampleSize() == 32)
+ return GetBufferLevel(buffer.constData<float>(), buffer.sampleCount()) / peak_value;
+ break;
+ case QAudioFormat::SignedInt:
+ if (buffer.format().sampleSize() == 32)
+ return GetBufferLevel(buffer.constData<long int>(), buffer.sampleCount()) / peak_value;
+ else if (buffer.format().sampleSize() == 16)
+ return GetBufferLevel(buffer.constData<short int>(), buffer.sampleCount()) / peak_value;
+ else if (buffer.format().sampleSize() == 8)
+ return GetBufferLevel(buffer.constData<signed char>(), buffer.sampleCount()) / peak_value;
+ break;
+ }
+
+ return 0.0;
+}
+
+template <class T>
+qreal AudioRecorder::GetBufferLevel(const T* buffer, int samples)
+{
+ qreal max_value = 0.0;
+
+ for (int i = 0; i < samples; i++) {
+ qreal value = qAbs((qreal)buffer[i]);
+ if (value > max_value)
+ max_value = value;
+ }
+
+ return max_value;
+}
+
+void AudioRecorder::processBuffer(const QAudioBuffer& buffer)
+{
+ qreal level = GetBufferLevel(buffer);
+ ui->audioLevel->setLevel(level);
+}
}
class QAudioRecorder;
+class QAudioProbe;
+class QAudioBuffer;
QT_END_NAMESPACE
QT_USE_NAMESPACE
AudioRecorder(QWidget *parent = 0);
~AudioRecorder();
+public slots:
+ void processBuffer(const QAudioBuffer&);
+
private slots:
void setOutputLocation();
void togglePause();
QUrl generateAudioFilePath();
private:
+ static qreal GetPeakValue(const QAudioFormat& format);
+ static qreal GetBufferLevel(const QAudioBuffer& buffer);
+
+ template <class T>
+ static qreal GetBufferLevel(const T* buffer, int samples);
+
Ui::AudioRecorder *ui;
QAudioRecorder* audioRecorder;
- QAudioEncoderSettings audioSettings;
+ QAudioProbe* probe;
bool outputLocationSet;
};
QT += multimedia
HEADERS = \
- audiorecorder.h
+ audiorecorder.h \
+ qaudiolevel.h
SOURCES = \
main.cpp \
- audiorecorder.cpp
+ audiorecorder.cpp \
+ qaudiolevel.cpp
maemo*: {
FORMS += audiorecorder_small.ui
</property>
</widget>
</item>
+ <item row="3" column="0">
+ <widget class="QLabel" name="levelLabel">
+ <property name="text">
+ <string>Audio Level:</string>
+ </property>
+ </widget>
+ </item>
+ <item row="3" column="1" colspan="-1">
+ <widget class="QAudioLevel" name="audioLevel">
+ </widget>
+ </item>
</layout>
</widget>
<widget class="QStatusBar" name="statusbar"/>
--- /dev/null
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** 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 "qaudiolevel.h"
+#include <QPainter>
+
+QAudioLevel::QAudioLevel(QWidget *parent)
+ : QWidget(parent)
+ , m_level(0.0)
+{
+}
+
+void QAudioLevel::setLevel(qreal level)
+{
+ if (m_level != level) {
+ m_level = level;
+ update();
+ }
+}
+
+void QAudioLevel::paintEvent(QPaintEvent *event)
+{
+ Q_UNUSED(event);
+
+ QPainter painter(this);
+ // draw level
+ qreal widthLevel = m_level * width();
+ painter.fillRect(0, 0, widthLevel, height(), Qt::red);
+ // clear the rest of the control
+ painter.fillRect(widthLevel, 0, width(), height(), Qt::black);
+}
--- /dev/null
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QAUDIOLEVEL_H
+#define QAUDIOLEVEL_H
+
+#include <QWidget>
+
+QT_USE_NAMESPACE
+
+class QAudioLevel : public QWidget
+{
+ Q_OBJECT
+public:
+ explicit QAudioLevel(QWidget *parent = 0);
+
+ // Using [0; 1.0] range
+ void setLevel(qreal level);
+
+protected:
+ void paintEvent(QPaintEvent *event);
+
+private:
+ qreal m_level;
+};
+
+#endif // QAUDIOLEVEL_H
projects / platform / upstream / qtmultimedia.git / commitdiff