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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">GEAudioBuffer.cpp Example File</h1> <span class="small-subtitle">demos/mobile/quickhit/ga_src/GEAudioBuffer.cpp</span> <!-- $$$demos/mobile/quickhit/ga_src/GEAudioBuffer.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2015 The Qt Company Ltd. ** Contact: http://www.qt.io/licensing/ ** ** This file is part of the QtDeclarative module 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 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 <QDebug></span> <span class="preprocessor">#include <math.h></span> <span class="preprocessor">#include "GEAudioBuffer.h"</span> <span class="keyword">using</span> <span class="keyword">namespace</span> GE; <span class="keyword">struct</span> SWavHeader { <span class="type">char</span> chunkID<span class="operator">[</span><span class="number">4</span><span class="operator">]</span>; <span class="type">unsigned</span> <span class="type">int</span> chunkSize; <span class="type">char</span> format<span class="operator">[</span><span class="number">4</span><span class="operator">]</span>; <span class="type">unsigned</span> <span class="type">char</span> subchunk1id<span class="operator">[</span><span class="number">4</span><span class="operator">]</span>; <span class="type">unsigned</span> <span class="type">int</span> subchunk1size; <span class="type">unsigned</span> <span class="type">short</span> audioFormat; <span class="type">unsigned</span> <span class="type">short</span> nofChannels; <span class="type">unsigned</span> <span class="type">int</span> sampleRate; <span class="type">unsigned</span> <span class="type">int</span> byteRate; <span class="type">unsigned</span> <span class="type">short</span> blockAlign; <span class="type">unsigned</span> <span class="type">short</span> bitsPerSample; <span class="type">unsigned</span> <span class="type">char</span> subchunk2id<span class="operator">[</span><span class="number">4</span><span class="operator">]</span>; <span class="type">unsigned</span> <span class="type">int</span> subchunk2size; }; CAudioBuffer<span class="operator">::</span>CAudioBuffer() { m_data <span class="operator">=</span> <span class="number">0</span>; m_dataLength <span class="operator">=</span> <span class="number">0</span>; m_sampleFunction <span class="operator">=</span> <span class="number">0</span>; }; CAudioBuffer<span class="operator">::</span><span class="operator">~</span>CAudioBuffer() { reallocate(<span class="number">0</span>); } <span class="type">void</span> CAudioBuffer<span class="operator">::</span>reallocate( <span class="type">int</span> length ) { <span class="keyword">if</span> (m_data) <span class="keyword">delete</span> <span class="operator">[</span><span class="operator">]</span> ((<span class="type">char</span><span class="operator">*</span>)m_data); m_dataLength <span class="operator">=</span> length; <span class="keyword">if</span> (m_dataLength<span class="operator">></span><span class="number">0</span>) { m_data <span class="operator">=</span> <span class="keyword">new</span> <span class="type">char</span><span class="operator">[</span> m_dataLength <span class="operator">]</span>; } <span class="keyword">else</span> m_data <span class="operator">=</span> <span class="number">0</span>; }; CAudioBuffer<span class="operator">*</span> CAudioBuffer<span class="operator">::</span>loadWav( <span class="type"><a href="qstring.html">QString</a></span> fileName ) { <span class="type"><a href="qfile.html">QFile</a></span> <span class="operator">*</span>wavFile <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qfile.html">QFile</a></span>( fileName ); <span class="keyword">if</span> (wavFile<span class="operator">-</span><span class="operator">></span>open(<span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly)) { SWavHeader header; wavFile<span class="operator">-</span><span class="operator">></span>read( header<span class="operator">.</span>chunkID<span class="operator">,</span> <span class="number">4</span> ); <span class="keyword">if</span> (header<span class="operator">.</span>chunkID<span class="operator">[</span><span class="number">0</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'R'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>chunkID<span class="operator">[</span><span class="number">1</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'I'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>chunkID<span class="operator">[</span><span class="number">2</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'F'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>chunkID<span class="operator">[</span><span class="number">3</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'F'</span>) <span class="keyword">return</span> <span class="number">0</span>; <span class="comment">// incorrect header</span> wavFile<span class="operator">-</span><span class="operator">></span>read( (<span class="type">char</span><span class="operator">*</span>)<span class="operator">&</span>header<span class="operator">.</span>chunkSize<span class="operator">,</span><span class="number">4</span> ); wavFile<span class="operator">-</span><span class="operator">></span>read( (<span class="type">char</span><span class="operator">*</span>)<span class="operator">&</span>header<span class="operator">.</span>format<span class="operator">,</span><span class="number">4</span> ); <span class="keyword">if</span> (header<span class="operator">.</span>format<span class="operator">[</span><span class="number">0</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'W'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>format<span class="operator">[</span><span class="number">1</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'A'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>format<span class="operator">[</span><span class="number">2</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'V'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>format<span class="operator">[</span><span class="number">3</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'E'</span>) <span class="keyword">return</span> <span class="number">0</span>; <span class="comment">// incorrect header</span> wavFile<span class="operator">-</span><span class="operator">></span>read( (<span class="type">char</span><span class="operator">*</span>)<span class="operator">&</span>header<span class="operator">.</span>subchunk1id<span class="operator">,</span><span class="number">4</span> ); <span class="keyword">if</span> (header<span class="operator">.</span>subchunk1id<span class="operator">[</span><span class="number">0</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'f'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>subchunk1id<span class="operator">[</span><span class="number">1</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'m'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>subchunk1id<span class="operator">[</span><span class="number">2</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'t'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>subchunk1id<span class="operator">[</span><span class="number">3</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">' '</span>) <span class="keyword">return</span> <span class="number">0</span>; <span class="comment">// incorrect header</span> wavFile<span class="operator">-</span><span class="operator">></span>read( (<span class="type">char</span><span class="operator">*</span>)<span class="operator">&</span>header<span class="operator">.</span>subchunk1size<span class="operator">,</span><span class="number">4</span> ); wavFile<span class="operator">-</span><span class="operator">></span>read( (<span class="type">char</span><span class="operator">*</span>)<span class="operator">&</span>header<span class="operator">.</span>audioFormat<span class="operator">,</span><span class="number">2</span> ); wavFile<span class="operator">-</span><span class="operator">></span>read( (<span class="type">char</span><span class="operator">*</span>)<span class="operator">&</span>header<span class="operator">.</span>nofChannels<span class="operator">,</span><span class="number">2</span> ); wavFile<span class="operator">-</span><span class="operator">></span>read( (<span class="type">char</span><span class="operator">*</span>)<span class="operator">&</span>header<span class="operator">.</span>sampleRate<span class="operator">,</span><span class="number">4</span> ); wavFile<span class="operator">-</span><span class="operator">></span>read( (<span class="type">char</span><span class="operator">*</span>)<span class="operator">&</span>header<span class="operator">.</span>byteRate<span class="operator">,</span><span class="number">4</span> ); wavFile<span class="operator">-</span><span class="operator">></span>read( (<span class="type">char</span><span class="operator">*</span>)<span class="operator">&</span>header<span class="operator">.</span>blockAlign<span class="operator">,</span><span class="number">2</span> ); wavFile<span class="operator">-</span><span class="operator">></span>read( (<span class="type">char</span><span class="operator">*</span>)<span class="operator">&</span>header<span class="operator">.</span>bitsPerSample<span class="operator">,</span><span class="number">2</span> ); <a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> fileName <span class="operator"><</span><span class="operator"><</span> <span class="string">" opened"</span>; <span class="keyword">while</span> (<span class="number">1</span>) { <span class="keyword">if</span> (wavFile<span class="operator">-</span><span class="operator">></span>read( (<span class="type">char</span><span class="operator">*</span>)<span class="operator">&</span>header<span class="operator">.</span>subchunk2id<span class="operator">,</span><span class="number">4</span> ) <span class="operator">!</span><span class="operator">=</span> <span class="number">4</span>) <span class="keyword">return</span> <span class="number">0</span>; <span class="keyword">if</span> (wavFile<span class="operator">-</span><span class="operator">></span>read( (<span class="type">char</span><span class="operator">*</span>)<span class="operator">&</span>header<span class="operator">.</span>subchunk2size<span class="operator">,</span><span class="number">4</span> ) <span class="operator">!</span><span class="operator">=</span> <span class="number">4</span>) <span class="keyword">return</span> <span class="number">0</span>; <span class="comment">//int deb_size = header.subchunk2size;</span> <span class="comment">//char tes[4];</span> <span class="comment">//memcpy(tes, header.subchunk2id, 4 );</span> <span class="comment">//if (header.subchunk2id[0]!='d' || header.subchunk2id[1]!='a' || header.subchunk2id[2]!='t' || header.subchunk2id[3]!='a') return 0; // incorrect header</span> <span class="keyword">if</span> (header<span class="operator">.</span>subchunk2id<span class="operator">[</span><span class="number">0</span><span class="operator">]</span><span class="operator">=</span><span class="operator">=</span><span class="char">'d'</span> <span class="operator">&</span><span class="operator">&</span> header<span class="operator">.</span>subchunk2id<span class="operator">[</span><span class="number">1</span><span class="operator">]</span><span class="operator">=</span><span class="operator">=</span><span class="char">'a'</span> <span class="operator">&</span><span class="operator">&</span> header<span class="operator">.</span>subchunk2id<span class="operator">[</span><span class="number">2</span><span class="operator">]</span><span class="operator">=</span><span class="operator">=</span><span class="char">'t'</span> <span class="operator">&</span><span class="operator">&</span> header<span class="operator">.</span>subchunk2id<span class="operator">[</span><span class="number">3</span><span class="operator">]</span><span class="operator">=</span><span class="operator">=</span><span class="char">'a'</span>) <span class="keyword">break</span>; <span class="comment">// found the data, chunk</span> <span class="comment">// this was not the data-chunk. skip it</span> <span class="keyword">if</span> (header<span class="operator">.</span>subchunk2size<span class="operator"><</span><span class="number">1</span>) <span class="keyword">return</span> <span class="number">0</span>; <span class="comment">// error in file</span> <span class="type">char</span> <span class="operator">*</span>unused <span class="operator">=</span> <span class="keyword">new</span> <span class="type">char</span><span class="operator">[</span>header<span class="operator">.</span>subchunk2size<span class="operator">]</span>; wavFile<span class="operator">-</span><span class="operator">></span>read( unused<span class="operator">,</span> header<span class="operator">.</span>subchunk2size ); <span class="keyword">delete</span> <span class="operator">[</span><span class="operator">]</span> unused; } <span class="comment">// the data follows.</span> <span class="keyword">if</span> (header<span class="operator">.</span>subchunk2size<span class="operator"><</span><span class="number">1</span>) <span class="keyword">return</span> <span class="number">0</span>; CAudioBuffer <span class="operator">*</span>rval <span class="operator">=</span> <span class="keyword">new</span> CAudioBuffer; rval<span class="operator">-</span><span class="operator">></span>m_nofChannels <span class="operator">=</span> header<span class="operator">.</span>nofChannels; rval<span class="operator">-</span><span class="operator">></span>m_bitsPerSample <span class="operator">=</span> header<span class="operator">.</span>bitsPerSample; rval<span class="operator">-</span><span class="operator">></span>m_samplesPerSec <span class="operator">=</span> header<span class="operator">.</span>sampleRate; rval<span class="operator">-</span><span class="operator">></span>m_signedData <span class="operator">=</span> <span class="number">0</span>; <span class="comment">// where to know this?</span> rval<span class="operator">-</span><span class="operator">></span>reallocate( header<span class="operator">.</span>subchunk2size ); wavFile<span class="operator">-</span><span class="operator">></span>read( (<span class="type">char</span><span class="operator">*</span>)rval<span class="operator">-</span><span class="operator">></span>m_data<span class="operator">,</span> header<span class="operator">.</span>subchunk2size ); <span class="comment">// choose a good sampling function.</span> rval<span class="operator">-</span><span class="operator">></span>m_sampleFunction <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">if</span> (rval<span class="operator">-</span><span class="operator">></span>m_nofChannels<span class="operator">=</span><span class="operator">=</span><span class="number">1</span>) { <span class="keyword">if</span> (rval<span class="operator">-</span><span class="operator">></span>m_bitsPerSample <span class="operator">=</span><span class="operator">=</span> <span class="number">8</span>) rval<span class="operator">-</span><span class="operator">></span>m_sampleFunction <span class="operator">=</span> sampleFunction8bitMono; <span class="keyword">if</span> (rval<span class="operator">-</span><span class="operator">></span>m_bitsPerSample <span class="operator">=</span><span class="operator">=</span> <span class="number">16</span>) rval<span class="operator">-</span><span class="operator">></span>m_sampleFunction <span class="operator">=</span> sampleFunction16bitMono; } <span class="keyword">else</span> { <span class="keyword">if</span> (rval<span class="operator">-</span><span class="operator">></span>m_bitsPerSample <span class="operator">=</span><span class="operator">=</span> <span class="number">8</span>) rval<span class="operator">-</span><span class="operator">></span>m_sampleFunction <span class="operator">=</span> sampleFunction8bitStereo; <span class="keyword">if</span> (rval<span class="operator">-</span><span class="operator">></span>m_bitsPerSample <span class="operator">=</span><span class="operator">=</span> <span class="number">16</span>) rval<span class="operator">-</span><span class="operator">></span>m_sampleFunction <span class="operator">=</span> sampleFunction16bitStereo; } <span class="keyword">return</span> rval; } <span class="keyword">else</span> { <a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> fileName <span class="operator"><</span><span class="operator"><</span> <span class="string">" NOT opened"</span>; <span class="keyword">return</span> <span class="number">0</span>; } <span class="keyword">delete</span> wavFile; }; CAudioBuffer<span class="operator">*</span> CAudioBuffer<span class="operator">::</span>loadWav( FILE <span class="operator">*</span>wavFile ) { <span class="comment">// read the header.</span> SWavHeader header; fread( header<span class="operator">.</span>chunkID<span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> wavFile ); <span class="keyword">if</span> (header<span class="operator">.</span>chunkID<span class="operator">[</span><span class="number">0</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'R'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>chunkID<span class="operator">[</span><span class="number">1</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'I'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>chunkID<span class="operator">[</span><span class="number">2</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'F'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>chunkID<span class="operator">[</span><span class="number">3</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'F'</span>) <span class="keyword">return</span> <span class="number">0</span>; <span class="comment">// incorrect header</span> fread( <span class="operator">&</span>header<span class="operator">.</span>chunkSize<span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> wavFile ); fread( header<span class="operator">.</span>format<span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> wavFile ); <span class="keyword">if</span> (header<span class="operator">.</span>format<span class="operator">[</span><span class="number">0</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'W'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>format<span class="operator">[</span><span class="number">1</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'A'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>format<span class="operator">[</span><span class="number">2</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'V'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>format<span class="operator">[</span><span class="number">3</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'E'</span>) <span class="keyword">return</span> <span class="number">0</span>; <span class="comment">// incorrect header</span> fread( header<span class="operator">.</span>subchunk1id<span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> wavFile ); <span class="keyword">if</span> (header<span class="operator">.</span>subchunk1id<span class="operator">[</span><span class="number">0</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'f'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>subchunk1id<span class="operator">[</span><span class="number">1</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'m'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>subchunk1id<span class="operator">[</span><span class="number">2</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'t'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>subchunk1id<span class="operator">[</span><span class="number">3</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">' '</span>) <span class="keyword">return</span> <span class="number">0</span>; <span class="comment">// incorrect header</span> fread( <span class="operator">&</span>header<span class="operator">.</span>subchunk1size<span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> wavFile ); fread( <span class="operator">&</span>header<span class="operator">.</span>audioFormat<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> wavFile ); fread( <span class="operator">&</span>header<span class="operator">.</span>nofChannels<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> wavFile ); fread( <span class="operator">&</span>header<span class="operator">.</span>sampleRate<span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> wavFile ); fread( <span class="operator">&</span>header<span class="operator">.</span>byteRate<span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> wavFile ); fread( <span class="operator">&</span>header<span class="operator">.</span>blockAlign<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> wavFile ); fread( <span class="operator">&</span>header<span class="operator">.</span>bitsPerSample<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> wavFile ); fread( header<span class="operator">.</span>subchunk2id<span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> wavFile ); <span class="keyword">if</span> (header<span class="operator">.</span>subchunk2id<span class="operator">[</span><span class="number">0</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'d'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>subchunk2id<span class="operator">[</span><span class="number">1</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'a'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>subchunk2id<span class="operator">[</span><span class="number">2</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'t'</span> <span class="operator">|</span><span class="operator">|</span> header<span class="operator">.</span>subchunk2id<span class="operator">[</span><span class="number">3</span><span class="operator">]</span><span class="operator">!</span><span class="operator">=</span><span class="char">'a'</span>) <span class="keyword">return</span> <span class="number">0</span>; <span class="comment">// incorrect header</span> fread( <span class="operator">&</span>header<span class="operator">.</span>subchunk2size<span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> wavFile ); <span class="comment">// the data follows.</span> <span class="keyword">if</span> (header<span class="operator">.</span>subchunk2size<span class="operator"><</span><span class="number">1</span>) <span class="keyword">return</span> <span class="number">0</span>; CAudioBuffer <span class="operator">*</span>rval <span class="operator">=</span> <span class="keyword">new</span> CAudioBuffer; rval<span class="operator">-</span><span class="operator">></span>m_nofChannels <span class="operator">=</span> header<span class="operator">.</span>nofChannels; rval<span class="operator">-</span><span class="operator">></span>m_bitsPerSample <span class="operator">=</span> header<span class="operator">.</span>bitsPerSample; rval<span class="operator">-</span><span class="operator">></span>m_samplesPerSec <span class="operator">=</span> header<span class="operator">.</span>sampleRate; rval<span class="operator">-</span><span class="operator">></span>m_signedData <span class="operator">=</span> <span class="number">0</span>; <span class="comment">// where to know this?</span> rval<span class="operator">-</span><span class="operator">></span>reallocate( header<span class="operator">.</span>subchunk2size ); fread( rval<span class="operator">-</span><span class="operator">></span>m_data<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> header<span class="operator">.</span>subchunk2size<span class="operator">,</span> wavFile ); <span class="comment">// choose a good sampling function.</span> rval<span class="operator">-</span><span class="operator">></span>m_sampleFunction <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">if</span> (rval<span class="operator">-</span><span class="operator">></span>m_nofChannels<span class="operator">=</span><span class="operator">=</span><span class="number">1</span>) { <span class="keyword">if</span> (rval<span class="operator">-</span><span class="operator">></span>m_bitsPerSample <span class="operator">=</span><span class="operator">=</span> <span class="number">8</span>) rval<span class="operator">-</span><span class="operator">></span>m_sampleFunction <span class="operator">=</span> sampleFunction8bitMono; <span class="keyword">if</span> (rval<span class="operator">-</span><span class="operator">></span>m_bitsPerSample <span class="operator">=</span><span class="operator">=</span> <span class="number">16</span>) rval<span class="operator">-</span><span class="operator">></span>m_sampleFunction <span class="operator">=</span> sampleFunction16bitMono; } <span class="keyword">else</span> { <span class="keyword">if</span> (rval<span class="operator">-</span><span class="operator">></span>m_bitsPerSample <span class="operator">=</span><span class="operator">=</span> <span class="number">8</span>) rval<span class="operator">-</span><span class="operator">></span>m_sampleFunction <span class="operator">=</span> sampleFunction8bitStereo; <span class="keyword">if</span> (rval<span class="operator">-</span><span class="operator">></span>m_bitsPerSample <span class="operator">=</span><span class="operator">=</span> <span class="number">16</span>) rval<span class="operator">-</span><span class="operator">></span>m_sampleFunction <span class="operator">=</span> sampleFunction16bitStereo; } <span class="keyword">return</span> rval; }; AUDIO_SAMPLE_TYPE CAudioBuffer<span class="operator">::</span>sampleFunction8bitMono( CAudioBuffer <span class="operator">*</span>abuffer<span class="operator">,</span> <span class="type">int</span> pos<span class="operator">,</span> <span class="type">int</span> channel ) { <span class="keyword">return</span> (AUDIO_SAMPLE_TYPE)(((<span class="type">unsigned</span> <span class="type">char</span><span class="operator">*</span>)(abuffer<span class="operator">-</span><span class="operator">></span>m_data))<span class="operator">[</span>pos<span class="operator">]</span><span class="operator">-</span><span class="number">128</span>)<span class="operator"><</span><span class="operator"><</span><span class="number">8</span>; }; AUDIO_SAMPLE_TYPE CAudioBuffer<span class="operator">::</span>sampleFunction16bitMono( CAudioBuffer <span class="operator">*</span>abuffer<span class="operator">,</span> <span class="type">int</span> pos<span class="operator">,</span> <span class="type">int</span> channel ) { <span class="keyword">return</span> (AUDIO_SAMPLE_TYPE)(((<span class="type">short</span><span class="operator">*</span>)(abuffer<span class="operator">-</span><span class="operator">></span>m_data))<span class="operator">[</span>pos<span class="operator">]</span>); }; AUDIO_SAMPLE_TYPE CAudioBuffer<span class="operator">::</span>sampleFunction8bitStereo( CAudioBuffer <span class="operator">*</span>abuffer<span class="operator">,</span> <span class="type">int</span> pos<span class="operator">,</span> <span class="type">int</span> channel ) { <span class="keyword">return</span> ((AUDIO_SAMPLE_TYPE)(((<span class="type">char</span><span class="operator">*</span>)(abuffer<span class="operator">-</span><span class="operator">></span>m_data))<span class="operator">[</span>pos<span class="operator">*</span>abuffer<span class="operator">-</span><span class="operator">></span>m_nofChannels <span class="operator">+</span> channel<span class="operator">]</span>)<span class="operator"><</span><span class="operator"><</span><span class="number">8</span>); }; AUDIO_SAMPLE_TYPE CAudioBuffer<span class="operator">::</span>sampleFunction16bitStereo( CAudioBuffer <span class="operator">*</span>abuffer<span class="operator">,</span> <span class="type">int</span> pos<span class="operator">,</span> <span class="type">int</span> channel ) { <span class="keyword">return</span> (AUDIO_SAMPLE_TYPE)(((<span class="type">short</span><span class="operator">*</span>)(abuffer<span class="operator">-</span><span class="operator">></span>m_data))<span class="operator">[</span>pos<span class="operator">*</span>abuffer<span class="operator">-</span><span class="operator">></span>m_nofChannels <span class="operator">+</span> channel<span class="operator">]</span>); }; CAudioBufferPlayInstance <span class="operator">*</span>CAudioBuffer<span class="operator">::</span>playWithMixer( CAudioMixer <span class="operator">&</span>mixer ) { CAudioBufferPlayInstance <span class="operator">*</span>i <span class="operator">=</span> (CAudioBufferPlayInstance<span class="operator">*</span>)mixer<span class="operator">.</span>addAudioSource( <span class="keyword">new</span> CAudioBufferPlayInstance( <span class="keyword">this</span> )); <span class="keyword">return</span> i; }; CAudioBufferPlayInstance<span class="operator">::</span>CAudioBufferPlayInstance() { m_fixedPos <span class="operator">=</span> <span class="number">0</span>; m_fixedInc <span class="operator">=</span> <span class="number">0</span>; m_buffer <span class="operator">=</span> <span class="number">0</span>; m_fixedLeftVolume <span class="operator">=</span> <span class="number">4096</span>; m_fixedRightVolume <span class="operator">=</span> <span class="number">4096</span>; m_destroyWhenFinished <span class="operator">=</span> <span class="keyword">true</span>; m_finished <span class="operator">=</span> <span class="keyword">false</span>; }; CAudioBufferPlayInstance<span class="operator">::</span>CAudioBufferPlayInstance( CAudioBuffer <span class="operator">*</span>startPlaying ) { m_fixedPos <span class="operator">=</span> <span class="number">0</span>; m_fixedInc <span class="operator">=</span> <span class="number">0</span>; m_fixedLeftVolume <span class="operator">=</span> <span class="number">4096</span>; m_fixedRightVolume <span class="operator">=</span> <span class="number">4096</span>; m_destroyWhenFinished <span class="operator">=</span> <span class="keyword">true</span>; m_finished <span class="operator">=</span> <span class="keyword">false</span>; playBuffer( startPlaying<span class="operator">,</span> <span class="number">1.0f</span><span class="operator">,</span> <span class="number">1.0f</span> ); }; <span class="type">void</span> CAudioBufferPlayInstance<span class="operator">::</span>playBuffer( CAudioBuffer <span class="operator">*</span>startPlaying<span class="operator">,</span> <span class="type">float</span> volume<span class="operator">,</span> <span class="type">float</span> speed<span class="operator">,</span> <span class="type">int</span> loopTimes ) { m_buffer <span class="operator">=</span> startPlaying; m_fixedLeftVolume <span class="operator">=</span> (<span class="type">int</span>)(<span class="number">4096.0f</span><span class="operator">*</span>volume); m_fixedRightVolume <span class="operator">=</span> m_fixedLeftVolume; m_fixedPos <span class="operator">=</span> <span class="number">0</span>; <span class="comment">//m_fixedInc = ( startPlaying->getSamplesPerSec() * (int)(4096.0f*speed)) / AUDIO_FREQUENCY;</span> setSpeed( speed ); m_loopTimes <span class="operator">=</span> loopTimes; }; CAudioBufferPlayInstance<span class="operator">::</span><span class="operator">~</span>CAudioBufferPlayInstance() { }; <span class="type">void</span> CAudioBufferPlayInstance<span class="operator">::</span>stop() { m_buffer <span class="operator">=</span> <span class="number">0</span>; m_finished <span class="operator">=</span> <span class="keyword">true</span>; }; <span class="type">void</span> CAudioBufferPlayInstance<span class="operator">::</span>setSpeed( <span class="type">float</span> speed ) { <span class="keyword">if</span> (<span class="operator">!</span>m_buffer) <span class="keyword">return</span>; m_fixedInc <span class="operator">=</span> (<span class="type">int</span>)( ((<span class="type">float</span>)m_buffer<span class="operator">-</span><span class="operator">></span>getSamplesPerSec() <span class="operator">*</span> <span class="number">4096.0f</span><span class="operator">*</span>speed) <span class="operator">/</span> (<span class="type">float</span>)AUDIO_FREQUENCY ); }; <span class="type">void</span> CAudioBufferPlayInstance<span class="operator">::</span>setLeftVolume( <span class="type">float</span> vol ) { m_fixedLeftVolume <span class="operator">=</span> (<span class="type">int</span>)(<span class="number">4096.0f</span><span class="operator">*</span>vol); }; <span class="type">void</span> CAudioBufferPlayInstance<span class="operator">::</span>setRightVolume( <span class="type">float</span> vol ) { m_fixedRightVolume <span class="operator">=</span> (<span class="type">int</span>)(<span class="number">4096.0f</span><span class="operator">*</span>vol); }; <span class="type">bool</span> CAudioBufferPlayInstance<span class="operator">::</span>canBeDestroyed() { <span class="keyword">if</span> (m_finished<span class="operator">=</span><span class="operator">=</span><span class="keyword">true</span> <span class="operator">&</span><span class="operator">&</span> m_destroyWhenFinished<span class="operator">=</span><span class="operator">=</span><span class="keyword">true</span>) <span class="keyword">return</span> <span class="keyword">true</span>; <span class="keyword">else</span> <span class="keyword">return</span> <span class="keyword">false</span>; }; <span class="comment">// Does not do any bound-checking. Must be checked before called.</span> <span class="type">int</span> CAudioBufferPlayInstance<span class="operator">::</span>mixBlock( AUDIO_SAMPLE_TYPE <span class="operator">*</span>target<span class="operator">,</span> <span class="type">int</span> samplesToMix ) { SAMPLE_FUNCTION_TYPE sampleFunction <span class="operator">=</span> m_buffer<span class="operator">-</span><span class="operator">></span>getSampleFunction(); <span class="keyword">if</span> (<span class="operator">!</span>sampleFunction) <span class="keyword">return</span> <span class="number">0</span>; <span class="comment">// unsupported sampletype</span> AUDIO_SAMPLE_TYPE <span class="operator">*</span>t_target <span class="operator">=</span> target<span class="operator">+</span>samplesToMix<span class="operator">*</span><span class="number">2</span>; <span class="type">int</span> sourcepos; <span class="comment">//int tempCounter = 0;</span> <span class="keyword">if</span> (m_buffer<span class="operator">-</span><span class="operator">></span>getNofChannels() <span class="operator">=</span><span class="operator">=</span> <span class="number">2</span>) { <span class="comment">// stereo</span> <span class="keyword">while</span> (target<span class="operator">!</span><span class="operator">=</span>t_target) { sourcepos <span class="operator">=</span> m_fixedPos<span class="operator">></span><span class="operator">></span><span class="number">12</span>; target<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">=</span> (((((sampleFunction)( m_buffer<span class="operator">,</span> sourcepos<span class="operator">,</span> <span class="number">0</span>) <span class="operator">*</span> (<span class="number">4096</span><span class="operator">-</span>(m_fixedPos<span class="operator">&</span><span class="number">4095</span>)) <span class="operator">+</span> (sampleFunction)( m_buffer<span class="operator">,</span> sourcepos<span class="operator">+</span><span class="number">1</span><span class="operator">,</span> <span class="number">0</span>) <span class="operator">*</span> (m_fixedPos<span class="operator">&</span><span class="number">4095</span>) ) <span class="operator">></span><span class="operator">></span> <span class="number">12</span>) <span class="operator">*</span> m_fixedLeftVolume) <span class="operator">></span><span class="operator">></span> <span class="number">12</span>); target<span class="operator">[</span><span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> (((((sampleFunction)( m_buffer<span class="operator">,</span> sourcepos<span class="operator">,</span> <span class="number">1</span>) <span class="operator">*</span> (<span class="number">4096</span><span class="operator">-</span>(m_fixedPos<span class="operator">&</span><span class="number">4095</span>)) <span class="operator">+</span> (sampleFunction)( m_buffer<span class="operator">,</span> sourcepos<span class="operator">+</span><span class="number">1</span><span class="operator">,</span> <span class="number">1</span>) <span class="operator">*</span> (m_fixedPos<span class="operator">&</span><span class="number">4095</span>) ) <span class="operator">></span><span class="operator">></span> <span class="number">12</span>) <span class="operator">*</span> m_fixedRightVolume) <span class="operator">></span><span class="operator">></span> <span class="number">12</span>); m_fixedPos<span class="operator">+</span><span class="operator">=</span>m_fixedInc; target<span class="operator">+</span><span class="operator">=</span><span class="number">2</span>; <span class="comment">//tempCounter++;</span> }; } <span class="keyword">else</span> { <span class="comment">// mono</span> <span class="type">int</span> temp; <span class="keyword">while</span> (target<span class="operator">!</span><span class="operator">=</span>t_target) { sourcepos <span class="operator">=</span> m_fixedPos<span class="operator">></span><span class="operator">></span><span class="number">12</span>; temp <span class="operator">=</span> (((sampleFunction)( m_buffer<span class="operator">,</span> sourcepos<span class="operator">,</span> <span class="number">0</span> ) <span class="operator">*</span> (<span class="number">4096</span><span class="operator">-</span>(m_fixedPos<span class="operator">&</span><span class="number">4095</span>)) <span class="operator">+</span> (sampleFunction)( m_buffer<span class="operator">,</span> sourcepos<span class="operator">+</span><span class="number">1</span><span class="operator">,</span> <span class="number">0</span> ) <span class="operator">*</span> (m_fixedPos<span class="operator">&</span><span class="number">4095</span>) ) <span class="operator">></span><span class="operator">></span> <span class="number">12</span>); target<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">=</span> ((temp<span class="operator">*</span>m_fixedLeftVolume)<span class="operator">></span><span class="operator">></span><span class="number">12</span>); target<span class="operator">[</span><span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> ((temp<span class="operator">*</span>m_fixedRightVolume)<span class="operator">></span><span class="operator">></span><span class="number">12</span>); m_fixedPos<span class="operator">+</span><span class="operator">=</span>m_fixedInc; target<span class="operator">+</span><span class="operator">=</span><span class="number">2</span>; <span class="comment">//tempCounter++;</span> }; }; <span class="keyword">return</span> samplesToMix; }; <span class="type">int</span> CAudioBufferPlayInstance<span class="operator">::</span>pullAudio( AUDIO_SAMPLE_TYPE <span class="operator">*</span>target<span class="operator">,</span> <span class="type">int</span> bufferLength ) { <span class="keyword">if</span> (<span class="operator">!</span>m_buffer) <span class="keyword">return</span> <span class="number">0</span>; <span class="comment">// no sample associated to mix..</span> <span class="type">int</span> channelLength <span class="operator">=</span> ((m_buffer<span class="operator">-</span><span class="operator">></span>getDataLength()) <span class="operator">/</span> (m_buffer<span class="operator">-</span><span class="operator">></span>getNofChannels()<span class="operator">*</span>m_buffer<span class="operator">-</span><span class="operator">></span>getBytesPerSample()))<span class="operator">-</span><span class="number">2</span>; <span class="type">int</span> samplesToWrite <span class="operator">=</span> bufferLength<span class="operator">/</span><span class="number">2</span>; <span class="type">int</span> amount; <span class="type">int</span> totalMixed <span class="operator">=</span> <span class="number">0</span>; <span class="keyword">while</span> (samplesToWrite<span class="operator">></span><span class="number">0</span>) { <span class="type">int</span> samplesLeft <span class="operator">=</span> channelLength <span class="operator">-</span> (m_fixedPos<span class="operator">></span><span class="operator">></span><span class="number">12</span>); <span class="type">int</span> maxMixAmount <span class="operator">=</span> (<span class="type">int</span>)(((<span class="type">long</span> <span class="type">long</span> <span class="type">int</span>)(samplesLeft)<span class="operator"><</span><span class="operator"><</span><span class="number">12</span>) <span class="operator">/</span> m_fixedInc ); <span class="comment">// This is how much we can mix at least</span> <span class="comment">//int maxMixAmount = (int)((float)samplesLeft / ((float)m_fixedInc/4096.0f));</span> <span class="comment">//if (maxMixAmount<1) maxMixAmount = 1; // NOTE, THIS MIGHT CAUSE PROBLEMS. NEEDS CHECKING</span> <span class="keyword">if</span> (maxMixAmount<span class="operator">></span>samplesToWrite) { maxMixAmount<span class="operator">=</span>samplesToWrite; } <span class="keyword">if</span> (maxMixAmount <span class="operator">></span> <span class="number">0</span>) { amount<span class="operator">=</span>mixBlock(target<span class="operator">+</span>totalMixed <span class="operator">*</span> <span class="number">2</span><span class="operator">,</span> maxMixAmount); <span class="keyword">if</span> (amount <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) { <span class="comment">// Error!</span> <span class="keyword">break</span>; } totalMixed<span class="operator">+</span><span class="operator">=</span>amount; } <span class="keyword">else</span> { amount <span class="operator">=</span> <span class="number">0</span>; m_fixedPos <span class="operator">=</span> channelLength<span class="operator"><</span><span class="operator"><</span><span class="number">12</span>; } <span class="comment">// sample is ended,.. check the looping variables and see what to do.</span> <span class="keyword">if</span> ((m_fixedPos<span class="operator">></span><span class="operator">></span><span class="number">12</span>)<span class="operator">></span><span class="operator">=</span>channelLength) { m_fixedPos <span class="operator">-</span><span class="operator">=</span> (channelLength<span class="operator"><</span><span class="operator"><</span><span class="number">12</span>); <span class="keyword">if</span> (m_loopTimes<span class="operator">></span><span class="number">0</span>) m_loopTimes<span class="operator">-</span><span class="operator">-</span>; <span class="keyword">if</span> (m_loopTimes<span class="operator">=</span><span class="operator">=</span><span class="number">0</span>) { stop(); <span class="keyword">return</span> totalMixed; } } samplesToWrite<span class="operator">-</span><span class="operator">=</span>amount; <span class="keyword">if</span> (samplesToWrite<span class="operator"><</span><span class="number">1</span>) <span class="keyword">break</span>; }; <span class="keyword">return</span> totalMixed<span class="operator">*</span><span class="number">2</span>; };</pre> </div> <!-- @@@demos/mobile/quickhit/ga_src/GEAudioBuffer.cpp --> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd. 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