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| <a href="#gst-plugins-base-libs-gstfft.description" class="shortcut">Description</a> |
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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> |
| <col align="left" valign="top"> |
| <col> |
| </colgroup> |
| <tbody> |
| <tr> |
| <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> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <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> |
| <div class="variablelist"><table border="0" class="variablelist"> |
| <colgroup> |
| <col align="left" valign="top"> |
| <col> |
| </colgroup> |
| <tbody> |
| <tr> |
| <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> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
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