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20 <th width="100%" align="center">GStreamer Base Plugins 0.10 Library Reference Manual</th>
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24 <a href="#gst-plugins-base-libs-gstfft.synopsis" class="shortcut">Top</a>
26 <a href="#gst-plugins-base-libs-gstfft.description" class="shortcut">Description</a>
29 <div class="refentry">
30 <a name="gst-plugins-base-libs-gstfft"></a><div class="titlepage"></div>
31 <div class="refnamediv"><table width="100%"><tr>
33 <h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstfft.top_of_page"></a>gstfft</span></h2>
34 <p>gstfft — General FFT functions and declarations</p>
36 <td valign="top" align="right"></td>
38 <div class="refsynopsisdiv">
39 <a name="gst-plugins-base-libs-gstfft.synopsis"></a><h2>Synopsis</h2>
40 <pre class="synopsis">
41 #include <gst/fft/gstfft.h>
43 enum <a class="link" href="gst-plugins-base-libs-gstfft.html#GstFFTWindow" title="enum GstFFTWindow">GstFFTWindow</a>;
44 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> <a class="link" href="gst-plugins-base-libs-gstfft.html#gst-fft-next-fast-length" title="gst_fft_next_fast_length ()">gst_fft_next_fast_length</a> (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> n</code></em>);
47 <div class="refsect1">
48 <a name="gst-plugins-base-libs-gstfft.description"></a><h2>Description</h2>
50 This library includes general definitions and functions, useful for
51 all typed FFT classes.
54 <div class="refsect1">
55 <a name="gst-plugins-base-libs-gstfft.details"></a><h2>Details</h2>
56 <div class="refsect2">
57 <a name="GstFFTWindow"></a><h3>enum GstFFTWindow</h3>
58 <pre class="programlisting">typedef enum {
59 GST_FFT_WINDOW_RECTANGULAR,
60 GST_FFT_WINDOW_HAMMING,
62 GST_FFT_WINDOW_BARTLETT,
63 GST_FFT_WINDOW_BLACKMAN
67 The various window functions available.
69 <div class="variablelist"><table border="0">
70 <col align="left" valign="top">
73 <td><p><a name="GST-FFT-WINDOW-RECTANGULAR:CAPS"></a><span class="term"><code class="literal">GST_FFT_WINDOW_RECTANGULAR</code></span></p></td>
74 <td>Rectangular window
78 <td><p><a name="GST-FFT-WINDOW-HAMMING:CAPS"></a><span class="term"><code class="literal">GST_FFT_WINDOW_HAMMING</code></span></p></td>
83 <td><p><a name="GST-FFT-WINDOW-HANN:CAPS"></a><span class="term"><code class="literal">GST_FFT_WINDOW_HANN</code></span></p></td>
84 <td>Hann (sometimes also called Hanning) window
88 <td><p><a name="GST-FFT-WINDOW-BARTLETT:CAPS"></a><span class="term"><code class="literal">GST_FFT_WINDOW_BARTLETT</code></span></p></td>
93 <td><p><a name="GST-FFT-WINDOW-BLACKMAN:CAPS"></a><span class="term"><code class="literal">GST_FFT_WINDOW_BLACKMAN</code></span></p></td>
101 <div class="refsect2">
102 <a name="gst-fft-next-fast-length"></a><h3>gst_fft_next_fast_length ()</h3>
103 <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> gst_fft_next_fast_length (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> n</code></em>);</pre>
105 Returns the next number to <em class="parameter"><code>n</code></em> that is entirely a product
106 of 2, 3 and 5. Using this as the <em class="parameter"><code>len</code></em> parameter for
107 the different GstFFT types will provide the best performance.
109 <div class="variablelist"><table border="0">
110 <col align="left" valign="top">
113 <td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td>
114 <td>Number for which the next fast length should be returned</td>
117 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
118 <td>the next fast FFT length.</td>
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