<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>gstfft</title> <meta name="generator" content="DocBook XSL Stylesheets V1.72.0"> <link rel="start" href="index.html" title="GStreamer Base Plugins 0.10 Library Reference Manual"> <link rel="up" href="gstreamer-ffft.html" title="FFT Library"> <link rel="prev" href="gstreamer-ffft.html" title="FFT Library"> <link rel="next" href="gst-plugins-base-libs-gstffts16.html" title="gstffts16"> <meta name="generator" content="GTK-Doc V1.8 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> <link rel="part" href="gstreamer-plugins-base.html" title="Part I. GStreamer Base Plugins Libraries"> <link rel="chapter" href="gstreamer-audio.html" title="Audio Library"> <link rel="chapter" href="gstreamer-cdda.html" title="CDDA Library"> <link rel="chapter" href="gstreamer-ffft.html" title="FFT Library"> <link rel="chapter" href="gstreamer-floatcast.html" title="FloatCast Library"> <link rel="chapter" href="gstreamer-interfaces.html" title="Interfaces Library"> <link rel="chapter" href="gstreamer-netbuffer.html" title="Network Buffer Library"> <link rel="chapter" href="gstreamer-riff.html" title="Riff Media Library"> <link rel="chapter" href="gstreamer-rtp.html" title="RTP Library"> <link rel="chapter" href="gstreamer-rtsp.html" title="RTSP Library"> <link rel="chapter" href="gstreamer-sdp.html" title="SDP Library"> <link rel="chapter" href="gstreamer-tag.html" title="Tag Support Library"> <link rel="chapter" href="gstreamer-base-utils.html" title="Base Utils Library"> <link rel="chapter" href="gstreamer-video.html" title="Video Library"> <link rel="part" href="gstreamer-libs-hierarchy.html" title="Part II. Object Hierarchy"> <link rel="index" href="api-index.html" title="Index"> </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-ffft.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td> <td><a accesskey="u" href="gstreamer-ffft.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="gst-plugins-base-libs-gstffts16.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td> </tr> <tr><td colspan="5" class="shortcuts"><nobr><a href="#id2584498" class="shortcut">Top</a>  |  <a href="#id2584541" class="shortcut">Description</a></nobr></td></tr> </table> <div class="refentry" lang="en"> <a name="gst-plugins-base-libs-gstfft"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2> <a name="id2584498"></a><span class="refentrytitle">gstfft</span> </h2> <p>gstfft — General FFT functions and declarations</p> </td> <td valign="top" align="right"></td> </tr></table></div> <div class="refsynopsisdiv"> <h2>Synopsis</h2> <pre class="synopsis"> #include <gst/fft/gstfft.h> enum <a href="gst-plugins-base-libs-gstfft.html#GstFFTWindow">GstFFTWindow</a>; gint <a href="gst-plugins-base-libs-gstfft.html#gst-fft-next-fast-length">gst_fft_next_fast_length</a> (gint n); </pre> </div> <div class="refsect1" lang="en"> <a name="id2584541"></a><h2>Description</h2> <p> This library includes general definitions and functions, useful for all typed FFT classes.</p> <p> </p> </div> <div class="refsect1" lang="en"> <a name="id2584560"></a><h2>Details</h2> <div class="refsect2" lang="en"> <a name="id2584571"></a><h3> <a name="GstFFTWindow"></a>enum GstFFTWindow</h3> <a class="indexterm" name="id2584583"></a><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> <p> </p> <div class="variablelist"><table border="0"> <col align="left" valign="top"> <tbody> <tr> <td><span class="term"><a name="GST-FFT-WINDOW-RECTANGULAR:CAPS"></a><code class="literal">GST_FFT_WINDOW_RECTANGULAR</code></span></td> <td> Rectangular window </td> </tr> <tr> <td><span class="term"><a name="GST-FFT-WINDOW-HAMMING:CAPS"></a><code class="literal">GST_FFT_WINDOW_HAMMING</code></span></td> <td> Hamming window </td> </tr> <tr> <td><span class="term"><a name="GST-FFT-WINDOW-HANN:CAPS"></a><code class="literal">GST_FFT_WINDOW_HANN</code></span></td> <td> Hann (sometimes also called Hanning) window </td> </tr> <tr> <td><span class="term"><a name="GST-FFT-WINDOW-BARTLETT:CAPS"></a><code class="literal">GST_FFT_WINDOW_BARTLETT</code></span></td> <td> Bartlett window </td> </tr> <tr> <td><span class="term"><a name="GST-FFT-WINDOW-BLACKMAN:CAPS"></a><code class="literal">GST_FFT_WINDOW_BLACKMAN</code></span></td> <td> Blackman window </td> </tr> </tbody> </table></div> </div> <hr> <div class="refsect2" lang="en"> <a name="id2584724"></a><h3> <a name="gst-fft-next-fast-length"></a>gst_fft_next_fast_length ()</h3> <a class="indexterm" name="id2584737"></a><pre class="programlisting">gint gst_fft_next_fast_length (gint n);</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> <p> </p> <div class="variablelist"><table border="0"> <col align="left" valign="top"> <tbody> <tr> <td><span class="term"><em class="parameter"><code>n</code></em> :</span></td> <td> Number for which the next fast length should be returned </td> </tr> <tr> <td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td> <td> the next fast FFT length. </td> </tr> </tbody> </table></div> </div> </div> </div> </body> </html>