406 lines
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406 lines
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<h1 class="title">waveform.h Example File</h1>
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<span class="small-subtitle">demos/spectrum/app/waveform.h</span>
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<!-- $$$demos/spectrum/app/waveform.h-description -->
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<div class="descr"> <a name="details"></a>
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<pre class="cpp"> <span class="comment">/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
|
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/</span>
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<span class="preprocessor">#ifndef WAVEFORM_H</span>
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<span class="preprocessor">#define WAVEFORM_H</span>
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<span class="preprocessor">#include <QWidget></span>
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<span class="preprocessor">#include <QtMultimedia/QAudioFormat></span>
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<span class="preprocessor">#include <QPixmap></span>
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<span class="preprocessor">#include <QScopedPointer></span>
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QT_FORWARD_DECLARE_CLASS(<span class="type"><a href="qbytearray.html">QByteArray</a></span>)
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<span class="comment">/**
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* Widget which displays a section of the audio waveform.
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*
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* The waveform is rendered on a set of QPixmaps which form a group of tiles
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* whose extent covers the widget. As the audio position is updated, these
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* tiles are scrolled from left to right; when the left-most tile scrolls
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* outside the widget, it is moved to the right end of the tile array and
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* painted with the next section of the waveform.
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*/</span>
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<span class="keyword">class</span> Waveform : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span> {
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Q_OBJECT
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<span class="keyword">public</span>:
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Waveform(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>);
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<span class="operator">~</span>Waveform();
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<span class="comment">// QWidget</span>
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<span class="type">void</span> paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event);
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<span class="type">void</span> resizeEvent(<span class="type"><a href="qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span>event);
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<span class="type">void</span> initialize(<span class="keyword">const</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> <span class="operator">&</span>format<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> audioBufferSize<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> windowDurationUs);
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<span class="type">void</span> reset();
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<span class="type">void</span> setAutoUpdatePosition(<span class="type">bool</span> enabled);
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|
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<span class="keyword">public</span> <span class="keyword">slots</span>:
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<span class="type">void</span> bufferChanged(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> length<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span> <span class="operator">&</span>buffer);
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<span class="type">void</span> audioPositionChanged(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position);
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<span class="keyword">private</span>:
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<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">int</span> NullIndex <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
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<span class="type">void</span> deletePixmaps();
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<span class="comment">/*
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* (Re)create all pixmaps, repaint and update the display.
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* Triggers an update();
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*/</span>
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<span class="type">void</span> createPixmaps(<span class="keyword">const</span> <span class="type"><a href="qsize.html">QSize</a></span> <span class="operator">&</span>newSize);
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|
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<span class="comment">/*
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* Update window position.
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* Triggers an update().
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*/</span>
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<span class="type">void</span> setWindowPosition(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position);
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<span class="comment">/*
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* Base position of tile
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*/</span>
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<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> tilePosition(<span class="type">int</span> index) <span class="keyword">const</span>;
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<span class="comment">/*
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|
* Structure which identifies a point within a given
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* tile.
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|
*/</span>
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<span class="keyword">struct</span> TilePoint
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{
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TilePoint(<span class="type">int</span> idx <span class="operator">=</span> <span class="number">0</span><span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> pos <span class="operator">=</span> <span class="number">0</span><span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> pix <span class="operator">=</span> <span class="number">0</span>)
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: index(idx)<span class="operator">,</span> positionOffset(pos)<span class="operator">,</span> pixelOffset(pix)
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{ }
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<span class="comment">// Index of tile</span>
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<span class="type">int</span> index;
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<span class="comment">// Number of bytes from start of tile</span>
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<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> positionOffset;
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<span class="comment">// Number of pixels from left of corresponding pixmap</span>
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<span class="type">int</span> pixelOffset;
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};
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<span class="comment">/*
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* Convert position in m_buffer into a tile index and an offset in pixels
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* into the corresponding pixmap.
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*
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* \param position Offset into m_buffer, in bytes
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* If position is outside the tile array, index is NullIndex and
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* offset is zero.
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*/</span>
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TilePoint tilePoint(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position) <span class="keyword">const</span>;
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<span class="comment">/*
|
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* Convert offset in bytes into a tile into an offset in pixels
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* within that tile.
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*/</span>
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<span class="type">int</span> tilePixelOffset(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> positionOffset) <span class="keyword">const</span>;
|
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|
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<span class="comment">/*
|
|
* Convert offset in bytes into the window into an offset in pixels
|
|
* within the widget rect().
|
|
*/</span>
|
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<span class="type">int</span> windowPixelOffset(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> positionOffset) <span class="keyword">const</span>;
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|
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<span class="comment">/*
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* Paint all tiles which can be painted.
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* \return true iff update() was called
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*/</span>
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<span class="type">bool</span> paintTiles();
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<span class="comment">/*
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* Paint the specified tile
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*
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* \pre Sufficient data is available to completely paint the tile, i.e.
|
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* m_dataLength is greater than the upper bound of the tile.
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*/</span>
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<span class="type">void</span> paintTile(<span class="type">int</span> index);
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|
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<span class="comment">/*
|
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* Move the first n tiles to the end of the array, and mark them as not
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* painted.
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*/</span>
|
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<span class="type">void</span> shuffleTiles(<span class="type">int</span> n);
|
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|
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<span class="comment">/*
|
|
* Reset tile array
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|
*/</span>
|
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<span class="type">void</span> resetTiles(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> newStartPos);
|
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|
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<span class="keyword">private</span>:
|
|
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> m_bufferPosition;
|
|
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> m_bufferLength;
|
|
<span class="type"><a href="qbytearray.html">QByteArray</a></span> m_buffer;
|
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|
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<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> m_audioPosition;
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<span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> m_format;
|
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<span class="type">bool</span> m_active;
|
|
|
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<span class="type"><a href="qsize.html">QSize</a></span> m_pixmapSize;
|
|
<span class="type"><a href="qvector.html">QVector</a></span><span class="operator"><</span><span class="type"><a href="qpixmap.html">QPixmap</a></span><span class="operator">*</span><span class="operator">></span> m_pixmaps;
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|
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<span class="keyword">struct</span> Tile {
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<span class="comment">// Pointer into parent m_pixmaps array</span>
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<span class="type"><a href="qpixmap.html">QPixmap</a></span><span class="operator">*</span> pixmap;
|
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|
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<span class="comment">// Flag indicating whether this tile has been painted</span>
|
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<span class="type">bool</span> painted;
|
|
};
|
|
|
|
<span class="type"><a href="qvector.html">QVector</a></span><span class="operator"><</span>Tile<span class="operator">></span> m_tiles;
|
|
|
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<span class="comment">// Length of audio data in bytes depicted by each tile</span>
|
|
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> m_tileLength;
|
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|
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<span class="comment">// Position in bytes of the first tile, relative to m_buffer</span>
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|
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> m_tileArrayStart;
|
|
|
|
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> m_windowPosition;
|
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<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> m_windowLength;
|
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|
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};
|
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|
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<span class="preprocessor">#endif // WAVEFORM_H</span></pre>
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</div>
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