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, 90 insertions, 0 deletions

diff --git a/demos/spectrum/app/frequencyspectrum.cpp b/demos/spectrum/app/frequencyspectrum.cpp
new file mode 100644
index 0000000000..6ab80c2362
--- /dev/null
+++ b/demos/spectrum/app/frequencyspectrum.cpp
@@ -0,0 +1,90 @@
+/****************************************************************************
+**
+** 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "frequencyspectrum.h"
+
+FrequencySpectrum::FrequencySpectrum(int numPoints)
+    :   m_elements(numPoints)
+{
+
+}
+
+void FrequencySpectrum::reset()
+{
+    iterator i = begin();
+    for ( ; i != end(); ++i)
+        *i = Element();
+}
+
+int FrequencySpectrum::count() const
+{
+    return m_elements.count();
+}
+
+FrequencySpectrum::Element& FrequencySpectrum::operator[](int index)
+{
+    return m_elements[index];
+}
+
+const FrequencySpectrum::Element& FrequencySpectrum::operator[](int index) const
+{
+    return m_elements[index];
+}
+
+FrequencySpectrum::iterator FrequencySpectrum::begin()
+{
+    return m_elements.begin();
+}
+
+FrequencySpectrum::iterator FrequencySpectrum::end()
+{
+    return m_elements.end();
+}
+
+FrequencySpectrum::const_iterator FrequencySpectrum::begin() const
+{
+    return m_elements.begin();
+}
+
+FrequencySpectrum::const_iterator FrequencySpectrum::end() const
+{
+    return m_elements.end();
+}