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<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 -->
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