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   <div id="projectname">FLAC
   &#160;<span id="projectnumber">1.3.0</span>
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<div class="title">Porting Guide for New Versions</div>  </div>
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Modules</h2></td></tr>
<tr class="memitem:group__porting__1__1__2__to__1__1__3"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__porting__1__1__2__to__1__1__3.html">Porting from FLAC 1.1.2 to 1.1.3</a></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>This module describes differences in the library interfaces from version to version. It assists in the porting of code that uses the libraries to newer versions of FLAC.</p>
<p>One simple facility for making porting easier that has been added in FLAC 1.1.3 is a set of <code>#defines</code> in <code>export.h</code> of each library's includes (e.g. <code><a class="el" href="export_8h.html" title="This module contains #defines and symbols for exporting function calls, and providing version informa...">include/FLAC/export.h</a></code>). The <code>#defines</code> mirror the libraries' <a href="http://www.gnu.org/software/libtool/manual/libtool.html#Libtool-versioning">libtool version numbers</a>, e.g. in libFLAC there are <code>FLAC_API_VERSION_CURRENT</code>, <code>FLAC_API_VERSION_REVISION</code>, and <code>FLAC_API_VERSION_AGE</code>. These can be used to support multiple versions of an API during the transition phase, e.g.</p>
<div class="fragment"><div class="line">* #<span class="keywordflow">if</span> !defined(<a class="code" href="group__flac__export.html#ga31180fe15eea416cd8957cfca1a4c4f8">FLAC_API_VERSION_CURRENT</a>) || <a class="code" href="group__flac__export.html#ga31180fe15eea416cd8957cfca1a4c4f8">FLAC_API_VERSION_CURRENT</a> &lt;= 7</div>
<div class="line">*   legacy code</div>
<div class="line">* #<span class="keywordflow">else</span></div>
<div class="line">*   <span class="keyword">new</span> code</div>
<div class="line">* #endif</div>
<div class="line">* </div>
</div><!-- fragment --><p>The the source will work for multiple versions and the legacy code can easily be removed when the transition is complete.</p>
<p>Another available symbol is FLAC_API_SUPPORTS_OGG_FLAC (defined in <a class="el" href="export_8h.html" title="This module contains #defines and symbols for exporting function calls, and providing version informa...">include/FLAC/export.h</a>), which can be used to determine whether or not the library has been compiled with support for Ogg FLAC. This is simpler than trying to call an Ogg init function and catching the error. </p>
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