Add spectrum analyzer demo app

This application is a demo which uses the QtMultimedia APIs to
capture and play back PCM audio.  While either recording or playback
is ongoing, the application performs real-time level and frequency
spectrum analysis.

Reviewed-by: Alessandro Portale

1 files changed, 82 insertions, 0 deletions

diff --git a/demos/spectrum/app/settingsdialog.h b/demos/spectrum/app/settingsdialog.h
new file mode 100644
index 0000000..5f613c0
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+++ b/demos/spectrum/app/settingsdialog.h
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+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** 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.
+**
+*****************************************************************************/
+
+#ifndef SETTINGSDIALOG_H
+#define SETTINGSDIALOG_H
+
+#include "spectrum.h"
+#include <QDialog>
+#include <QtMultimedia/QAudioDeviceInfo>
+
+class QComboBox;
+class QCheckBox;
+class QSlider;
+class QSpinBox;
+class QGridLayout;
+
+/**
+ * Dialog used to control settings such as the audio input / output device
+ * and the windowing function.
+ */
+class SettingsDialog : public QDialog {
+    Q_OBJECT
+public:
+    SettingsDialog(const QList<QAudioDeviceInfo> &availableInputDevices,
+                   const QList<QAudioDeviceInfo> &availableOutputDevices,
+                   QWidget *parent = 0);
+    ~SettingsDialog();
+
+    WindowFunction windowFunction() const           { return m_windowFunction; }
+    const QAudioDeviceInfo& inputDevice() const     { return m_inputDevice; }
+    const QAudioDeviceInfo& outputDevice() const    { return m_outputDevice; }
+
+private slots:
+    void windowFunctionChanged(int index);
+    void inputDeviceChanged(int index);
+    void outputDeviceChanged(int index);
+
+private:
+    WindowFunction   m_windowFunction;
+    QAudioDeviceInfo m_inputDevice;
+    QAudioDeviceInfo m_outputDevice;
+
+    QComboBox*      m_inputDeviceComboBox;
+    QComboBox*      m_outputDeviceComboBox;
+
+    QComboBox*      m_windowFunctionComboBox;
+
+};
+
+#endif // SETTINGSDIALOG_H