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Breadcrumbs go here --> </ul> </div> <div class="toolbuttons toolblock"> <ul> <li id="smallA" class="t_button">A</li> <li id="medA" class="t_button active">A</li> <li id="bigA" class="t_button">A</li> <li id="print" class="t_button"><a href="javascript:this.print();"> <span>Print</span></a></li> </ul> </div> </div> <div class="content mainContent"> <h1 class="title">waveform.h Example File</h1> <span class="small-subtitle">demos/spectrum/app/waveform.h</span> <!-- $$$demos/spectrum/app/waveform.h-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** 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 Digia Plc 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#ifndef WAVEFORM_H</span> <span class="preprocessor">#define WAVEFORM_H</span> <span class="preprocessor">#include <QWidget></span> <span class="preprocessor">#include <QtMultimedia/QAudioFormat></span> <span class="preprocessor">#include <QPixmap></span> <span class="preprocessor">#include <QScopedPointer></span> QT_FORWARD_DECLARE_CLASS(<span class="type"><a href="qbytearray.html">QByteArray</a></span>) <span class="comment">/** * Widget which displays a section of the audio waveform. * * The waveform is rendered on a set of QPixmaps which form a group of tiles * whose extent covers the widget. As the audio position is updated, these * tiles are scrolled from left to right; when the left-most tile scrolls * outside the widget, it is moved to the right end of the tile array and * painted with the next section of the waveform. */</span> <span class="keyword">class</span> Waveform : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span> { Q_OBJECT <span class="keyword">public</span>: 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>); <span class="operator">~</span>Waveform(); <span class="comment">// QWidget</span> <span class="type">void</span> paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event); <span class="type">void</span> resizeEvent(<span class="type"><a href="qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span>event); <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); <span class="type">void</span> reset(); <span class="type">void</span> setAutoUpdatePosition(<span class="type">bool</span> enabled); <span class="keyword">public</span> <span class="keyword">slots</span>: <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); <span class="type">void</span> audioPositionChanged(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position); <span class="keyword">private</span>: <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>; <span class="type">void</span> deletePixmaps(); <span class="comment">/* * (Re)create all pixmaps, repaint and update the display. * Triggers an update(); */</span> <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); <span class="comment">/* * Update window position. * Triggers an update(). */</span> <span class="type">void</span> setWindowPosition(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position); <span class="comment">/* * Base position of tile */</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> tilePosition(<span class="type">int</span> index) <span class="keyword">const</span>; <span class="comment">/* * Structure which identifies a point within a given * tile. */</span> <span class="keyword">struct</span> TilePoint { 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>) : index(idx)<span class="operator">,</span> positionOffset(pos)<span class="operator">,</span> pixelOffset(pix) { } <span class="comment">// Index of tile</span> <span class="type">int</span> index; <span class="comment">// Number of bytes from start of tile</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> positionOffset; <span class="comment">// Number of pixels from left of corresponding pixmap</span> <span class="type">int</span> pixelOffset; }; <span class="comment">/* * Convert position in m_buffer into a tile index and an offset in pixels * into the corresponding pixmap. * * \param position Offset into m_buffer, in bytes * If position is outside the tile array, index is NullIndex and * offset is zero. */</span> TilePoint tilePoint(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position) <span class="keyword">const</span>; <span class="comment">/* * Convert offset in bytes into a tile into an offset in pixels * within that tile. */</span> <span class="type">int</span> tilePixelOffset(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> positionOffset) <span class="keyword">const</span>; <span class="comment">/* * Convert offset in bytes into the window into an offset in pixels * within the widget rect(). */</span> <span class="type">int</span> windowPixelOffset(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> positionOffset) <span class="keyword">const</span>; <span class="comment">/* * Paint all tiles which can be painted. * \return true iff update() was called */</span> <span class="type">bool</span> paintTiles(); <span class="comment">/* * Paint the specified tile * * \pre Sufficient data is available to completely paint the tile, i.e. * m_dataLength is greater than the upper bound of the tile. */</span> <span class="type">void</span> paintTile(<span class="type">int</span> index); <span class="comment">/* * Move the first n tiles to the end of the array, and mark them as not * painted. */</span> <span class="type">void</span> shuffleTiles(<span class="type">int</span> n); <span class="comment">/* * Reset tile array */</span> <span class="type">void</span> resetTiles(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> newStartPos); <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; <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> m_audioPosition; <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> m_format; <span class="type">bool</span> m_active; <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; <span class="keyword">struct</span> Tile { <span class="comment">// Pointer into parent m_pixmaps array</span> <span class="type"><a href="qpixmap.html">QPixmap</a></span><span class="operator">*</span> pixmap; <span class="comment">// Flag indicating whether this tile has been painted</span> <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; <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; <span class="comment">// Position in bytes of the first tile, relative to m_buffer</span> <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; <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> m_windowLength; }; <span class="preprocessor">#endif // WAVEFORM_H</span></pre> </div> <!-- @@@demos/spectrum/app/waveform.h --> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2013 Digia Plc and/or its subsidiaries. Documentation contributions included herein are the copyrights of their respective owners.</p> <br /> <p> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.</p> <p> Documentation sources may be obtained from <a href="http://www.qt-project.org"> www.qt-project.org</a>.</p> <br /> <p> Digia, Qt and their respective logos are trademarks of Digia Plc in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. <a title="Privacy Policy" href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p> </div> <script src="scripts/functions.js" type="text/javascript"></script> </body> </html>