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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#gst-plugins-base-libs-gstfft.synopsis" class="shortcut">Top</a>
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<a href="#gst-plugins-base-libs-gstfft.description" class="shortcut">Description</a>
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<a name="gst-plugins-base-libs-gstfft"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstfft.top_of_page"></a>gstfft</span></h2>
<p>gstfft — General FFT functions and declarations</p>
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<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gstfft.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gst/fft/gstfft.h>
enum <a class="link" href="gst-plugins-base-libs-gstfft.html#GstFFTWindow" title="enum GstFFTWindow">GstFFTWindow</a>;
<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>);
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstfft.description"></a><h2>Description</h2>
<p>
This library includes general definitions and functions, useful for
all typed FFT classes.
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstfft.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstFFTWindow"></a><h3>enum GstFFTWindow</h3>
<pre class="programlisting">typedef enum {
GST_FFT_WINDOW_RECTANGULAR,
GST_FFT_WINDOW_HAMMING,
GST_FFT_WINDOW_HANN,
GST_FFT_WINDOW_BARTLETT,
GST_FFT_WINDOW_BLACKMAN
} GstFFTWindow;
</pre>
<p>
The various window functions available.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
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<col>
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<td><p><a name="GST-FFT-WINDOW-RECTANGULAR:CAPS"></a><span class="term"><code class="literal">GST_FFT_WINDOW_RECTANGULAR</code></span></p></td>
<td>Rectangular window
</td>
</tr>
<tr>
<td><p><a name="GST-FFT-WINDOW-HAMMING:CAPS"></a><span class="term"><code class="literal">GST_FFT_WINDOW_HAMMING</code></span></p></td>
<td>Hamming window
</td>
</tr>
<tr>
<td><p><a name="GST-FFT-WINDOW-HANN:CAPS"></a><span class="term"><code class="literal">GST_FFT_WINDOW_HANN</code></span></p></td>
<td>Hann (sometimes also called Hanning) window
</td>
</tr>
<tr>
<td><p><a name="GST-FFT-WINDOW-BARTLETT:CAPS"></a><span class="term"><code class="literal">GST_FFT_WINDOW_BARTLETT</code></span></p></td>
<td>Bartlett window
</td>
</tr>
<tr>
<td><p><a name="GST-FFT-WINDOW-BLACKMAN:CAPS"></a><span class="term"><code class="literal">GST_FFT_WINDOW_BLACKMAN</code></span></p></td>
<td>Blackman window
</td>
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</table></div>
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<hr>
<div class="refsect2">
<a name="gst-fft-next-fast-length"></a><h3>gst_fft_next_fast_length ()</h3>
<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>
<p>
Returns the next number to <em class="parameter"><code>n</code></em> that is entirely a product
of 2, 3 and 5. Using this as the <em class="parameter"><code>len</code></em> parameter for
the different GstFFT types will provide the best performance.
</p>
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<td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td>
<td>Number for which the next fast length should be returned</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the next fast FFT length.</td>
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