<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>gstfloatcast</title> <meta name="generator" content="DocBook XSL Stylesheets V1.76.1"> <link rel="home" href="index.html" title="GStreamer Base Plugins 0.10 Library Reference Manual"> <link rel="up" href="gstreamer-floatcast.html" title="FloatCast Library"> <link rel="prev" href="gstreamer-floatcast.html" title="FloatCast Library"> <link rel="next" href="gstreamer-interfaces.html" title="Interfaces Library"> <meta name="generator" content="GTK-Doc V1.18 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"> <tr valign="middle"> <td><a accesskey="p" href="gstreamer-floatcast.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td> <td><a accesskey="u" href="gstreamer-floatcast.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td> <td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td> <th width="100%" align="center">GStreamer Base Plugins 0.10 Library Reference Manual</th> <td><a accesskey="n" href="gstreamer-interfaces.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td> </tr> <tr><td colspan="5" class="shortcuts"> <a href="#gst-plugins-base-libs-gstfloatcast.synopsis" class="shortcut">Top</a> | <a href="#gst-plugins-base-libs-gstfloatcast.description" class="shortcut">Description</a> </td></tr> </table> <div class="refentry"> <a name="gst-plugins-base-libs-gstfloatcast"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstfloatcast.top_of_page"></a>gstfloatcast</span></h2> <p>gstfloatcast — Floating point platform independence macros</p> </td> <td valign="top" align="right"></td> </tr></table></div> <div class="refsynopsisdiv"> <a name="gst-plugins-base-libs-gstfloatcast.synopsis"></a><h2>Synopsis</h2> <pre class="synopsis"> #include <gst/floatcast/floatcast.h> #define <a class="link" href="gst-plugins-base-libs-gstfloatcast.html#gst-cast-double" title="gst_cast_double()">gst_cast_double</a> (x) #define <a class="link" href="gst-plugins-base-libs-gstfloatcast.html#gst-cast-float" title="gst_cast_float()">gst_cast_float</a> (x) </pre> </div> <div class="refsect1"> <a name="gst-plugins-base-libs-gstfloatcast.description"></a><h2>Description</h2> <p> The floatcast.h header file contains a couple of convenience macros for floating point numbers. </p> <p> If you include this header, your application or library must link against libm (for maths.h support). </p> <p> For optimal results, your application's or library's build system should check whether the C99 functions lrint and lrintf are supported and define the preprocessor symbols HAVE_LRINT and HAVE_LRINTF if so. If you are using autoconf, you can do this by using the AC_C99_FUNC_LRINT and AC_C99_FUNC_LRINTF checks in your configure.ac or configure.in file and including your application's config.h header before you include floatcast.h. </p> </div> <div class="refsect1"> <a name="gst-plugins-base-libs-gstfloatcast.details"></a><h2>Details</h2> <div class="refsect2"> <a name="gst-cast-double"></a><h3>gst_cast_double()</h3> <pre class="programlisting"> #define gst_cast_double(x) ((gint)lrint(x)) </pre> <p> Casts a 64-bit floating point value (double) to an integer without bias. </p> <div class="variablelist"><table border="0"> <col align="left" valign="top"> <tbody><tr> <td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td> <td>input value</td> </tr></tbody> </table></div> </div> <hr> <div class="refsect2"> <a name="gst-cast-float"></a><h3>gst_cast_float()</h3> <pre class="programlisting"> #define gst_cast_float(x) ((gint)lrintf(x)) </pre> <p> Casts a 32-bit floating point value (float) to an integer without bias. </p> <div class="variablelist"><table border="0"> <col align="left" valign="top"> <tbody><tr> <td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td> <td>input value</td> </tr></tbody> </table></div> </div> </div> </div> <div class="footer"> <hr> Generated by GTK-Doc V1.18</div> </body> </html>