<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>waveform.cpp Example File | Qt Multimedia 5.9</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.9</td><td ><a href="qtmultimedia-index.html">Qt Multimedia</a></td><td ><a href="qtmultimedia-multimedia-spectrum-example.html">Spectrum Example</a></td><td >waveform.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">waveform.cpp Example File</h1> <span class="subtitle">multimedia/spectrum/app/waveform.cpp</span> <!-- $$$multimedia/spectrum/app/waveform.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2017 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, 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 The Qt Company Ltd 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">#include "waveform.h"</span> <span class="preprocessor">#include "utils.h"</span> <span class="preprocessor">#include <QPainter></span> <span class="preprocessor">#include <QResizeEvent></span> <span class="preprocessor">#include <QDebug></span> <span class="comment">//#define PAINT_EVENT_TRACE</span> <span class="preprocessor">#ifdef PAINT_EVENT_TRACE</span> <span class="preprocessor"># define WAVEFORM_PAINT_DEBUG qDebug()</span> <span class="preprocessor">#else</span> <span class="preprocessor"># define WAVEFORM_PAINT_DEBUG nullDebug()</span> <span class="preprocessor">#endif</span> Waveform<span class="operator">::</span>Waveform(<span class="type">QWidget</span> <span class="operator">*</span>parent) : <span class="type">QWidget</span>(parent) <span class="operator">,</span> m_bufferPosition(<span class="number">0</span>) <span class="operator">,</span> m_bufferLength(<span class="number">0</span>) <span class="operator">,</span> m_audioPosition(<span class="number">0</span>) <span class="operator">,</span> m_active(<span class="keyword">false</span>) <span class="operator">,</span> m_tileLength(<span class="number">0</span>) <span class="operator">,</span> m_tileArrayStart(<span class="number">0</span>) <span class="operator">,</span> m_windowPosition(<span class="number">0</span>) <span class="operator">,</span> m_windowLength(<span class="number">0</span>) { setSizePolicy(<span class="type">QSizePolicy</span><span class="operator">::</span>Preferred<span class="operator">,</span> <span class="type">QSizePolicy</span><span class="operator">::</span>Fixed); setMinimumHeight(<span class="number">50</span>); } Waveform<span class="operator">::</span><span class="operator">~</span>Waveform() { deletePixmaps(); } <span class="type">void</span> Waveform<span class="operator">::</span>paintEvent(<span class="type">QPaintEvent</span> <span class="operator">*</span> <span class="comment">/*event*/</span>) { <span class="type">QPainter</span> painter(<span class="keyword">this</span>); painter<span class="operator">.</span>fillRect(rect()<span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>black); <span class="keyword">if</span> (m_active) { WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"windowPosition"</span> <span class="operator"><</span><span class="operator"><</span> m_windowPosition <span class="operator"><</span><span class="operator"><</span> <span class="string">"windowLength"</span> <span class="operator"><</span><span class="operator"><</span> m_windowLength; <span class="type">qint64</span> pos <span class="operator">=</span> m_windowPosition; <span class="keyword">const</span> <span class="type">qint64</span> windowEnd <span class="operator">=</span> m_windowPosition <span class="operator">+</span> m_windowLength; <span class="type">int</span> destLeft <span class="operator">=</span> <span class="number">0</span>; <span class="type">int</span> destRight <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">while</span> (pos <span class="operator"><</span> windowEnd) { <span class="keyword">const</span> TilePoint point <span class="operator">=</span> tilePoint(pos); WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"pos"</span> <span class="operator"><</span><span class="operator"><</span> pos <span class="operator"><</span><span class="operator"><</span> <span class="string">"tileIndex"</span> <span class="operator"><</span><span class="operator"><</span> point<span class="operator">.</span>index <span class="operator"><</span><span class="operator"><</span> <span class="string">"positionOffset"</span> <span class="operator"><</span><span class="operator"><</span> point<span class="operator">.</span>positionOffset <span class="operator"><</span><span class="operator"><</span> <span class="string">"pixelOffset"</span> <span class="operator"><</span><span class="operator"><</span> point<span class="operator">.</span>pixelOffset; <span class="keyword">if</span> (point<span class="operator">.</span>index <span class="operator">!</span><span class="operator">=</span> NullIndex) { <span class="keyword">const</span> Tile <span class="operator">&</span>tile <span class="operator">=</span> m_tiles<span class="operator">[</span>point<span class="operator">.</span>index<span class="operator">]</span>; <span class="keyword">if</span> (tile<span class="operator">.</span>painted) { <span class="keyword">const</span> <span class="type">qint64</span> sectionLength <span class="operator">=</span> qMin((m_tileLength <span class="operator">-</span> point<span class="operator">.</span>positionOffset)<span class="operator">,</span> (windowEnd <span class="operator">-</span> pos)); Q_ASSERT(sectionLength <span class="operator">></span> <span class="number">0</span>); <span class="keyword">const</span> <span class="type">int</span> sourceRight <span class="operator">=</span> tilePixelOffset(point<span class="operator">.</span>positionOffset <span class="operator">+</span> sectionLength); destRight <span class="operator">=</span> windowPixelOffset(pos <span class="operator">-</span> m_windowPosition <span class="operator">+</span> sectionLength); <span class="type">QRect</span> destRect <span class="operator">=</span> rect(); destRect<span class="operator">.</span>setLeft(destLeft); destRect<span class="operator">.</span>setRight(destRight); <span class="type">QRect</span> sourceRect(<span class="type">QPoint</span>()<span class="operator">,</span> m_pixmapSize); sourceRect<span class="operator">.</span>setLeft(point<span class="operator">.</span>pixelOffset); sourceRect<span class="operator">.</span>setRight(sourceRight); WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"tileIndex"</span> <span class="operator"><</span><span class="operator"><</span> point<span class="operator">.</span>index <span class="operator"><</span><span class="operator"><</span> <span class="string">"source"</span> <span class="operator"><</span><span class="operator"><</span> point<span class="operator">.</span>pixelOffset <span class="operator"><</span><span class="operator"><</span> sourceRight <span class="operator"><</span><span class="operator"><</span> <span class="string">"dest"</span> <span class="operator"><</span><span class="operator"><</span> destLeft <span class="operator"><</span><span class="operator"><</span> destRight; painter<span class="operator">.</span>drawPixmap(destRect<span class="operator">,</span> <span class="operator">*</span>tile<span class="operator">.</span>pixmap<span class="operator">,</span> sourceRect); destLeft <span class="operator">=</span> destRight; <span class="keyword">if</span> (point<span class="operator">.</span>index <span class="operator"><</span> m_tiles<span class="operator">.</span>count()) { pos <span class="operator">=</span> tilePosition(point<span class="operator">.</span>index <span class="operator">+</span> <span class="number">1</span>); WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"pos ->"</span> <span class="operator"><</span><span class="operator"><</span> pos; } <span class="keyword">else</span> { <span class="comment">// Reached end of tile array</span> WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"reached end of tile array"</span>; <span class="keyword">break</span>; } } <span class="keyword">else</span> { <span class="comment">// Passed last tile which is painted</span> WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"tile"</span> <span class="operator"><</span><span class="operator"><</span> point<span class="operator">.</span>index <span class="operator"><</span><span class="operator"><</span> <span class="string">"not painted"</span>; <span class="keyword">break</span>; } } <span class="keyword">else</span> { <span class="comment">// pos is past end of tile array</span> WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"pos"</span> <span class="operator"><</span><span class="operator"><</span> pos <span class="operator"><</span><span class="operator"><</span> <span class="string">"past end of tile array"</span>; <span class="keyword">break</span>; } } WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"final pos"</span> <span class="operator"><</span><span class="operator"><</span> pos <span class="operator"><</span><span class="operator"><</span> <span class="string">"final x"</span> <span class="operator"><</span><span class="operator"><</span> destRight; } } <span class="type">void</span> Waveform<span class="operator">::</span>resizeEvent(<span class="type">QResizeEvent</span> <span class="operator">*</span>event) { <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>size() <span class="operator">!</span><span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>oldSize()) createPixmaps(event<span class="operator">-</span><span class="operator">></span>size()); } <span class="type">void</span> Waveform<span class="operator">::</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">qint64</span> audioBufferSize<span class="operator">,</span> <span class="type">qint64</span> windowDurationUs) { WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::initialize"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"audioBufferSize"</span> <span class="operator"><</span><span class="operator"><</span> audioBufferSize <span class="operator"><</span><span class="operator"><</span> <span class="string">"windowDurationUs"</span> <span class="operator"><</span><span class="operator"><</span> windowDurationUs; reset(); m_format <span class="operator">=</span> format; <span class="comment">// Calculate tile size</span> m_tileLength <span class="operator">=</span> audioBufferSize; <span class="comment">// Calculate window size</span> m_windowLength <span class="operator">=</span> audioLength(m_format<span class="operator">,</span> windowDurationUs); <span class="comment">// Calculate number of tiles required</span> <span class="type">int</span> nTiles; <span class="keyword">if</span> (m_tileLength <span class="operator">></span> m_windowLength) { nTiles <span class="operator">=</span> <span class="number">2</span>; } <span class="keyword">else</span> { nTiles <span class="operator">=</span> m_windowLength <span class="operator">/</span> m_tileLength <span class="operator">+</span> <span class="number">1</span>; <span class="keyword">if</span> (m_windowLength <span class="operator">%</span> m_tileLength) <span class="operator">+</span><span class="operator">+</span>nTiles; } WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::initialize"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"tileLength"</span> <span class="operator"><</span><span class="operator"><</span> m_tileLength <span class="operator"><</span><span class="operator"><</span> <span class="string">"windowLength"</span> <span class="operator"><</span><span class="operator"><</span> m_windowLength <span class="operator"><</span><span class="operator"><</span> <span class="string">"nTiles"</span> <span class="operator"><</span><span class="operator"><</span> nTiles; m_pixmaps<span class="operator">.</span>fill(<span class="number">0</span><span class="operator">,</span> nTiles); m_tiles<span class="operator">.</span>resize(nTiles); createPixmaps(rect()<span class="operator">.</span>size()); m_active <span class="operator">=</span> <span class="keyword">true</span>; } <span class="type">void</span> Waveform<span class="operator">::</span>reset() { WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::reset"</span>; m_bufferPosition <span class="operator">=</span> <span class="number">0</span>; m_buffer <span class="operator">=</span> <span class="type">QByteArray</span>(); m_audioPosition <span class="operator">=</span> <span class="number">0</span>; m_format <span class="operator">=</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span>(); m_active <span class="operator">=</span> <span class="keyword">false</span>; deletePixmaps(); m_tiles<span class="operator">.</span>clear(); m_tileLength <span class="operator">=</span> <span class="number">0</span>; m_tileArrayStart <span class="operator">=</span> <span class="number">0</span>; m_windowPosition <span class="operator">=</span> <span class="number">0</span>; m_windowLength <span class="operator">=</span> <span class="number">0</span>; } <span class="type">void</span> Waveform<span class="operator">::</span>bufferChanged(<span class="type">qint64</span> position<span class="operator">,</span> <span class="type">qint64</span> length<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QByteArray</span> <span class="operator">&</span>buffer) { WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::bufferChanged"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"audioPosition"</span> <span class="operator"><</span><span class="operator"><</span> m_audioPosition <span class="operator"><</span><span class="operator"><</span> <span class="string">"bufferPosition"</span> <span class="operator"><</span><span class="operator"><</span> position <span class="operator"><</span><span class="operator"><</span> <span class="string">"bufferLength"</span> <span class="operator"><</span><span class="operator"><</span> length; m_bufferPosition <span class="operator">=</span> position; m_bufferLength <span class="operator">=</span> length; m_buffer <span class="operator">=</span> buffer; paintTiles(); } <span class="type">void</span> Waveform<span class="operator">::</span>audioPositionChanged(<span class="type">qint64</span> position) { WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::audioPositionChanged"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"audioPosition"</span> <span class="operator"><</span><span class="operator"><</span> position <span class="operator"><</span><span class="operator"><</span> <span class="string">"bufferPosition"</span> <span class="operator"><</span><span class="operator"><</span> m_bufferPosition <span class="operator"><</span><span class="operator"><</span> <span class="string">"bufferLength"</span> <span class="operator"><</span><span class="operator"><</span> m_bufferLength; <span class="keyword">if</span> (position <span class="operator">></span><span class="operator">=</span> m_bufferPosition) { <span class="keyword">if</span> (position <span class="operator">+</span> m_windowLength <span class="operator">></span> m_bufferPosition <span class="operator">+</span> m_bufferLength) position <span class="operator">=</span> qMax(<span class="type">qint64</span>(<span class="number">0</span>)<span class="operator">,</span> m_bufferPosition <span class="operator">+</span> m_bufferLength <span class="operator">-</span> m_windowLength); m_audioPosition <span class="operator">=</span> position; setWindowPosition(position); } } <span class="type">void</span> Waveform<span class="operator">::</span>deletePixmaps() { <span class="type">QPixmap</span> <span class="operator">*</span>pixmap; foreach (pixmap<span class="operator">,</span> m_pixmaps) <span class="keyword">delete</span> pixmap; m_pixmaps<span class="operator">.</span>clear(); } <span class="type">void</span> Waveform<span class="operator">::</span>createPixmaps(<span class="keyword">const</span> <span class="type">QSize</span> <span class="operator">&</span>widgetSize) { m_pixmapSize <span class="operator">=</span> widgetSize; m_pixmapSize<span class="operator">.</span>setWidth(<span class="type">qreal</span>(widgetSize<span class="operator">.</span>width()) <span class="operator">*</span> m_tileLength <span class="operator">/</span> m_windowLength); WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::createPixmaps"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"widgetSize"</span> <span class="operator"><</span><span class="operator"><</span> widgetSize <span class="operator"><</span><span class="operator"><</span> <span class="string">"pixmapSize"</span> <span class="operator"><</span><span class="operator"><</span> m_pixmapSize; Q_ASSERT(m_tiles<span class="operator">.</span>count() <span class="operator">=</span><span class="operator">=</span> m_pixmaps<span class="operator">.</span>count()); <span class="comment">// (Re)create pixmaps</span> <span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator"><</span>m_pixmaps<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) { <span class="keyword">delete</span> m_pixmaps<span class="operator">[</span>i<span class="operator">]</span>; m_pixmaps<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span>; m_pixmaps<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPixmap</span>(m_pixmapSize); } <span class="comment">// Update tile pixmap pointers, and mark for repainting</span> <span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator"><</span>m_tiles<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i) { m_tiles<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>pixmap <span class="operator">=</span> m_pixmaps<span class="operator">[</span>i<span class="operator">]</span>; m_tiles<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>painted <span class="operator">=</span> <span class="keyword">false</span>; } } <span class="type">void</span> Waveform<span class="operator">::</span>setWindowPosition(<span class="type">qint64</span> position) { WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::setWindowPosition"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"old"</span> <span class="operator"><</span><span class="operator"><</span> m_windowPosition <span class="operator"><</span><span class="operator"><</span> <span class="string">"new"</span> <span class="operator"><</span><span class="operator"><</span> position <span class="operator"><</span><span class="operator"><</span> <span class="string">"tileArrayStart"</span> <span class="operator"><</span><span class="operator"><</span> m_tileArrayStart; <span class="keyword">const</span> <span class="type">qint64</span> oldPosition <span class="operator">=</span> m_windowPosition; m_windowPosition <span class="operator">=</span> position; <span class="keyword">if</span> ((m_windowPosition <span class="operator">></span><span class="operator">=</span> oldPosition) <span class="operator">&</span><span class="operator">&</span> (m_windowPosition <span class="operator">-</span> m_tileArrayStart <span class="operator"><</span> (m_tiles<span class="operator">.</span>count() <span class="operator">*</span> m_tileLength))) { <span class="comment">// Work out how many tiles need to be shuffled</span> <span class="keyword">const</span> <span class="type">qint64</span> offset <span class="operator">=</span> m_windowPosition <span class="operator">-</span> m_tileArrayStart; <span class="keyword">const</span> <span class="type">int</span> nTiles <span class="operator">=</span> offset <span class="operator">/</span> m_tileLength; shuffleTiles(nTiles); } <span class="keyword">else</span> { resetTiles(m_windowPosition); } <span class="keyword">if</span> (<span class="operator">!</span>paintTiles() <span class="operator">&</span><span class="operator">&</span> m_windowPosition <span class="operator">!</span><span class="operator">=</span> oldPosition) update(); } <span class="type">qint64</span> Waveform<span class="operator">::</span>tilePosition(<span class="type">int</span> index) <span class="keyword">const</span> { <span class="keyword">return</span> m_tileArrayStart <span class="operator">+</span> index <span class="operator">*</span> m_tileLength; } Waveform<span class="operator">::</span>TilePoint Waveform<span class="operator">::</span>tilePoint(<span class="type">qint64</span> position) <span class="keyword">const</span> { TilePoint result; <span class="keyword">if</span> (position <span class="operator">></span><span class="operator">=</span> m_tileArrayStart) { <span class="keyword">const</span> <span class="type">qint64</span> tileArrayEnd <span class="operator">=</span> m_tileArrayStart <span class="operator">+</span> m_tiles<span class="operator">.</span>count() <span class="operator">*</span> m_tileLength; <span class="keyword">if</span> (position <span class="operator"><</span> tileArrayEnd) { <span class="keyword">const</span> <span class="type">qint64</span> offsetIntoTileArray <span class="operator">=</span> position <span class="operator">-</span> m_tileArrayStart; result<span class="operator">.</span>index <span class="operator">=</span> offsetIntoTileArray <span class="operator">/</span> m_tileLength; Q_ASSERT(result<span class="operator">.</span>index <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> result<span class="operator">.</span>index <span class="operator"><</span><span class="operator">=</span> m_tiles<span class="operator">.</span>count()); result<span class="operator">.</span>positionOffset <span class="operator">=</span> offsetIntoTileArray <span class="operator">%</span> m_tileLength; result<span class="operator">.</span>pixelOffset <span class="operator">=</span> tilePixelOffset(result<span class="operator">.</span>positionOffset); Q_ASSERT(result<span class="operator">.</span>pixelOffset <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> result<span class="operator">.</span>pixelOffset <span class="operator"><</span><span class="operator">=</span> m_pixmapSize<span class="operator">.</span>width()); } } <span class="keyword">return</span> result; } <span class="type">int</span> Waveform<span class="operator">::</span>tilePixelOffset(<span class="type">qint64</span> positionOffset) <span class="keyword">const</span> { Q_ASSERT(positionOffset <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> positionOffset <span class="operator"><</span><span class="operator">=</span> m_tileLength); <span class="keyword">const</span> <span class="type">int</span> result <span class="operator">=</span> (<span class="type">qreal</span>(positionOffset) <span class="operator">/</span> m_tileLength) <span class="operator">*</span> m_pixmapSize<span class="operator">.</span>width(); <span class="keyword">return</span> result; } <span class="type">int</span> Waveform<span class="operator">::</span>windowPixelOffset(<span class="type">qint64</span> positionOffset) <span class="keyword">const</span> { Q_ASSERT(positionOffset <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> positionOffset <span class="operator"><</span><span class="operator">=</span> m_windowLength); <span class="keyword">const</span> <span class="type">int</span> result <span class="operator">=</span> (<span class="type">qreal</span>(positionOffset) <span class="operator">/</span> m_windowLength) <span class="operator">*</span> rect()<span class="operator">.</span>width(); <span class="keyword">return</span> result; } bool Waveform<span class="operator">::</span>paintTiles() { WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintTiles"</span>; bool updateRequired <span class="operator">=</span> <span class="keyword">false</span>; <span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator"><</span>m_tiles<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i) { <span class="keyword">const</span> Tile <span class="operator">&</span>tile <span class="operator">=</span> m_tiles<span class="operator">[</span>i<span class="operator">]</span>; <span class="keyword">if</span> (<span class="operator">!</span>tile<span class="operator">.</span>painted) { <span class="keyword">const</span> <span class="type">qint64</span> tileStart <span class="operator">=</span> m_tileArrayStart <span class="operator">+</span> i <span class="operator">*</span> m_tileLength; <span class="keyword">const</span> <span class="type">qint64</span> tileEnd <span class="operator">=</span> tileStart <span class="operator">+</span> m_tileLength; <span class="keyword">if</span> (m_bufferPosition <span class="operator"><</span><span class="operator">=</span> tileStart <span class="operator">&</span><span class="operator">&</span> m_bufferPosition <span class="operator">+</span> m_bufferLength <span class="operator">></span><span class="operator">=</span> tileEnd) { paintTile(i); updateRequired <span class="operator">=</span> <span class="keyword">true</span>; } } } <span class="keyword">if</span> (updateRequired) update(); <span class="keyword">return</span> updateRequired; } <span class="type">void</span> Waveform<span class="operator">::</span>paintTile(<span class="type">int</span> index) { <span class="keyword">const</span> <span class="type">qint64</span> tileStart <span class="operator">=</span> m_tileArrayStart <span class="operator">+</span> index <span class="operator">*</span> m_tileLength; WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintTile"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"index"</span> <span class="operator"><</span><span class="operator"><</span> index <span class="operator"><</span><span class="operator"><</span> <span class="string">"bufferPosition"</span> <span class="operator"><</span><span class="operator"><</span> m_bufferPosition <span class="operator"><</span><span class="operator"><</span> <span class="string">"bufferLength"</span> <span class="operator"><</span><span class="operator"><</span> m_bufferLength <span class="operator"><</span><span class="operator"><</span> <span class="string">"start"</span> <span class="operator"><</span><span class="operator"><</span> tileStart <span class="operator"><</span><span class="operator"><</span> <span class="string">"end"</span> <span class="operator"><</span><span class="operator"><</span> tileStart <span class="operator">+</span> m_tileLength; Q_ASSERT(m_bufferPosition <span class="operator"><</span><span class="operator">=</span> tileStart); Q_ASSERT(m_bufferPosition <span class="operator">+</span> m_bufferLength <span class="operator">></span><span class="operator">=</span> tileStart <span class="operator">+</span> m_tileLength); Tile <span class="operator">&</span>tile <span class="operator">=</span> m_tiles<span class="operator">[</span>index<span class="operator">]</span>; Q_ASSERT(<span class="operator">!</span>tile<span class="operator">.</span>painted); <span class="keyword">const</span> <span class="type">qint16</span><span class="operator">*</span> base <span class="operator">=</span> <span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="keyword">const</span> <span class="type">qint16</span><span class="operator">*</span><span class="operator">></span>(m_buffer<span class="operator">.</span>constData()); <span class="keyword">const</span> <span class="type">qint16</span><span class="operator">*</span> buffer <span class="operator">=</span> base <span class="operator">+</span> ((tileStart <span class="operator">-</span> m_bufferPosition) <span class="operator">/</span> <span class="number">2</span>); <span class="keyword">const</span> <span class="type">int</span> numSamples <span class="operator">=</span> m_tileLength <span class="operator">/</span> (<span class="number">2</span> <span class="operator">*</span> m_format<span class="operator">.</span>channelCount()); <span class="type">QPainter</span> painter(tile<span class="operator">.</span>pixmap); painter<span class="operator">.</span>fillRect(tile<span class="operator">.</span>pixmap<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>black); <span class="type">QPen</span> pen(<span class="type">Qt</span><span class="operator">::</span>white); painter<span class="operator">.</span>setPen(pen); <span class="comment">// Calculate initial PCM value</span> <span class="type">qint16</span> previousPcmValue <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">if</span> (buffer <span class="operator">></span> base) previousPcmValue <span class="operator">=</span> <span class="operator">*</span>(buffer <span class="operator">-</span> m_format<span class="operator">.</span>channelCount()); <span class="comment">// Calculate initial point</span> <span class="keyword">const</span> <span class="type">qreal</span> previousRealValue <span class="operator">=</span> pcmToReal(previousPcmValue); <span class="keyword">const</span> <span class="type">int</span> originY <span class="operator">=</span> ((previousRealValue <span class="operator">+</span> <span class="number">1.0</span>) <span class="operator">/</span> <span class="number">2</span>) <span class="operator">*</span> m_pixmapSize<span class="operator">.</span>height(); <span class="keyword">const</span> <span class="type">QPoint</span> origin(<span class="number">0</span><span class="operator">,</span> originY); <span class="type">QLine</span> line(origin<span class="operator">,</span> origin); <span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator"><</span>numSamples; <span class="operator">+</span><span class="operator">+</span>i) { <span class="keyword">const</span> <span class="type">qint16</span><span class="operator">*</span> ptr <span class="operator">=</span> buffer <span class="operator">+</span> i <span class="operator">*</span> m_format<span class="operator">.</span>channelCount(); <span class="keyword">const</span> <span class="type">int</span> offset <span class="operator">=</span> <span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="keyword">const</span> <span class="type">char</span><span class="operator">*</span><span class="operator">></span>(ptr) <span class="operator">-</span> m_buffer<span class="operator">.</span>constData(); Q_ASSERT(offset <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>); Q_ASSERT(offset <span class="operator"><</span> m_bufferLength); Q_UNUSED(offset); <span class="keyword">const</span> <span class="type">qint16</span> pcmValue <span class="operator">=</span> <span class="operator">*</span>ptr; <span class="keyword">const</span> <span class="type">qreal</span> realValue <span class="operator">=</span> pcmToReal(pcmValue); <span class="keyword">const</span> <span class="type">int</span> x <span class="operator">=</span> tilePixelOffset(i <span class="operator">*</span> <span class="number">2</span> <span class="operator">*</span> m_format<span class="operator">.</span>channelCount()); <span class="keyword">const</span> <span class="type">int</span> y <span class="operator">=</span> ((realValue <span class="operator">+</span> <span class="number">1.0</span>) <span class="operator">/</span> <span class="number">2</span>) <span class="operator">*</span> m_pixmapSize<span class="operator">.</span>height(); line<span class="operator">.</span>setP2(<span class="type">QPoint</span>(x<span class="operator">,</span> y)); painter<span class="operator">.</span>drawLine(line); line<span class="operator">.</span>setP1(line<span class="operator">.</span>p2()); } tile<span class="operator">.</span>painted <span class="operator">=</span> <span class="keyword">true</span>; } <span class="type">void</span> Waveform<span class="operator">::</span>shuffleTiles(<span class="type">int</span> n) { WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::shuffleTiles"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"n"</span> <span class="operator"><</span><span class="operator"><</span> n; <span class="keyword">while</span> (n<span class="operator">-</span><span class="operator">-</span>) { Tile tile <span class="operator">=</span> m_tiles<span class="operator">.</span>first(); tile<span class="operator">.</span>painted <span class="operator">=</span> <span class="keyword">false</span>; m_tiles<span class="operator">.</span>erase(m_tiles<span class="operator">.</span>begin()); m_tiles <span class="operator">+</span><span class="operator">=</span> tile; m_tileArrayStart <span class="operator">+</span><span class="operator">=</span> m_tileLength; } WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::shuffleTiles"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"tileArrayStart"</span> <span class="operator"><</span><span class="operator"><</span> m_tileArrayStart; } <span class="type">void</span> Waveform<span class="operator">::</span>resetTiles(<span class="type">qint64</span> newStartPos) { WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::resetTiles"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"newStartPos"</span> <span class="operator"><</span><span class="operator"><</span> newStartPos; <span class="type">QVector</span><span class="operator"><</span>Tile<span class="operator">></span><span class="operator">::</span>iterator i <span class="operator">=</span> m_tiles<span class="operator">.</span>begin(); <span class="keyword">for</span> ( ; i <span class="operator">!</span><span class="operator">=</span> m_tiles<span class="operator">.</span>end(); <span class="operator">+</span><span class="operator">+</span>i) i<span class="operator">-</span><span class="operator">></span>painted <span class="operator">=</span> <span class="keyword">false</span>; m_tileArrayStart <span class="operator">=</span> newStartPos; } </pre> </div> <!-- @@@multimedia/spectrum/app/waveform.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br> 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.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>