docs/libs/html/gst-plugins-base-libs-gstfloatcast.html

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  24 <a href="#gst-plugins-base-libs-gstfloatcast.synopsis" class="shortcut">Top</a>
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  26                   <a href="#gst-plugins-base-libs-gstfloatcast.description" class="shortcut">Description</a>
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  33 <h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstfloatcast.top_of_page"></a>gstfloatcast</span></h2>
  34 <p>gstfloatcast — Floating point platform independence macros</p>
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  38 <div class="refsynopsisdiv">
  39 <a name="gst-plugins-base-libs-gstfloatcast.synopsis"></a><h2>Synopsis</h2>
  40 <pre class="synopsis">
  41 #include &lt;gst/floatcast/floatcast.h&gt;
  42
  43 #define             <a class="link" href="gst-plugins-base-libs-gstfloatcast.html#gst-cast-double" title="gst_cast_double()">gst_cast_double</a>                     (x)
  44 #define             <a class="link" href="gst-plugins-base-libs-gstfloatcast.html#gst-cast-float" title="gst_cast_float()">gst_cast_float</a>                      (x)
  45 </pre>
  46 </div>
  47 <div class="refsect1">
  48 <a name="gst-plugins-base-libs-gstfloatcast.description"></a><h2>Description</h2>
  49 <p>
  50 The floatcast.h header file contains a couple of convenience macros for
  51 floating point numbers.
  52 </p>
  53 <p>
  54 If you include this header, your application or library must link against
  55 libm (for maths.h support).
  56 </p>
  57 <p>
  58 For optimal results, your application's or library's build
  59 system should check whether the C99 functions lrint and lrintf are supported
  60 and define the preprocessor symbols HAVE_LRINT and HAVE_LRINTF if so.  If
  61 you are using autoconf, you can do this by using the AC_C99_FUNC_LRINT and
  62 AC_C99_FUNC_LRINTF checks in your configure.ac or configure.in file and
  63 including your application's config.h header before you include floatcast.h.
  64 </p>
  65 </div>
  66 <div class="refsect1">
  67 <a name="gst-plugins-base-libs-gstfloatcast.details"></a><h2>Details</h2>
  68 <div class="refsect2">
  69 <a name="gst-cast-double"></a><h3>gst_cast_double()</h3>
  70 <pre class="programlisting">        #define gst_cast_double(x)      ((gint)lrint(x))
  71 </pre>
  72 <p>
  73 Casts a 64-bit floating point value (double) to an integer without bias.
  74 </p>
  75 <div class="variablelist"><table border="0">
  76 <col align="left" valign="top">
  77 <tbody><tr>
  78 <td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
  79 <td>input value</td>
  80 </tr></tbody>
  81 </table></div>
  82 </div>
  83 <hr>
  84 <div class="refsect2">
  85 <a name="gst-cast-float"></a><h3>gst_cast_float()</h3>
  86 <pre class="programlisting">        #define gst_cast_float(x)       ((gint)lrintf(x))
  87 </pre>
  88 <p>
  89 Casts a 32-bit floating point value (float) to an integer without bias.
  90 </p>
  91 <div class="variablelist"><table border="0">
  92 <col align="left" valign="top">
  93 <tbody><tr>
  94 <td><p><span class="term"><em class="parameter"><code>x</code></em> :</span></p></td>
  95 <td>input value</td>
  96 </tr></tbody>
  97 </table></div>
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