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| <a name="gst-plugins-base-libs-gstffts32"></a><div class="titlepage"></div> |
| <div class="refnamediv"><table width="100%"><tr> |
| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstffts32.top_of_page"></a>gstffts32</span></h2> |
| <p>gstffts32 — FFT functions for signed 32 bit integer samples</p> |
| </td> |
| <td class="gallery_image" valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gstffts32.functions"></a><h2>Functions</h2> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="functions_return"> |
| <col class="functions_name"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="function_type"> |
| <a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="returnvalue">GstFFTS32</span></a> * |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-gstffts32.html#gst-fft-s32-new" title="gst_fft_s32_new ()">gst_fft_s32_new</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-gstffts32.html#gst-fft-s32-fft" title="gst_fft_s32_fft ()">gst_fft_s32_fft</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-gstffts32.html#gst-fft-s32-inverse-fft" title="gst_fft_s32_inverse_fft ()">gst_fft_s32_inverse_fft</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-gstffts32.html#gst-fft-s32-window" title="gst_fft_s32_window ()">gst_fft_s32_window</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| <tr> |
| <td class="function_type"> |
| <span class="returnvalue">void</span> |
| </td> |
| <td class="function_name"> |
| <a class="link" href="gst-plugins-base-libs-gstffts32.html#gst-fft-s32-free" title="gst_fft_s32_free ()">gst_fft_s32_free</a> <span class="c_punctuation">()</span> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gstffts32.other"></a><h2>Types and Values</h2> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="name"> |
| <col class="description"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="datatype_keyword"> </td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32">GstFFTS32</a></td> |
| </tr> |
| <tr> |
| <td class="datatype_keyword">struct</td> |
| <td class="function_name"><a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32Complex" title="struct GstFFTS32Complex">GstFFTS32Complex</a></td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gstffts32.includes"></a><h2>Includes</h2> |
| <pre class="synopsis">#include <gst/fft/gstffts32.h> |
| </pre> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gstffts32.description"></a><h2>Description</h2> |
| <p><a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> provides a FFT implementation and related functions for |
| signed 32 bit integer samples. To use this call <a class="link" href="gst-plugins-base-libs-gstffts32.html#gst-fft-s32-new" title="gst_fft_s32_new ()"><code class="function">gst_fft_s32_new()</code></a> for |
| allocating a <a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> instance with the appropriate parameters and |
| then call <a class="link" href="gst-plugins-base-libs-gstffts32.html#gst-fft-s32-fft" title="gst_fft_s32_fft ()"><code class="function">gst_fft_s32_fft()</code></a> or <a class="link" href="gst-plugins-base-libs-gstffts32.html#gst-fft-s32-inverse-fft" title="gst_fft_s32_inverse_fft ()"><code class="function">gst_fft_s32_inverse_fft()</code></a> to perform the |
| FFT or inverse FFT on a buffer of samples.</p> |
| <p>After use free the <a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> instance with <a class="link" href="gst-plugins-base-libs-gstffts32.html#gst-fft-s32-free" title="gst_fft_s32_free ()"><code class="function">gst_fft_s32_free()</code></a>.</p> |
| <p>For the best performance use <a class="link" href="gst-plugins-base-libs-gstfft.html#gst-fft-next-fast-length" title="gst_fft_next_fast_length ()"><code class="function">gst_fft_next_fast_length()</code></a> to get a |
| number that is entirely a product of 2, 3 and 5 and use this as the |
| <em class="parameter"><code>len</code></em> |
| parameter for <a class="link" href="gst-plugins-base-libs-gstffts32.html#gst-fft-s32-new" title="gst_fft_s32_new ()"><code class="function">gst_fft_s32_new()</code></a>.</p> |
| <p>The <em class="parameter"><code>len</code></em> |
| parameter specifies the number of samples in the time domain that |
| will be processed or generated. The number of samples in the frequency domain |
| is <em class="parameter"><code>len</code></em> |
| /2 + 1. To get n samples in the frequency domain use 2*n - 2 as <em class="parameter"><code>len</code></em> |
| .</p> |
| <p>Before performing the FFT on time domain data it usually makes sense |
| to apply a window function to it. For this <a class="link" href="gst-plugins-base-libs-gstffts32.html#gst-fft-s32-window" title="gst_fft_s32_window ()"><code class="function">gst_fft_s32_window()</code></a> can comfortably |
| be used.</p> |
| <p>Be aware, that you can't simply run <a class="link" href="gst-plugins-base-libs-gstffts32.html#gst-fft-s32-inverse-fft" title="gst_fft_s32_inverse_fft ()"><code class="function">gst_fft_s32_inverse_fft()</code></a> on the |
| resulting frequency data of <a class="link" href="gst-plugins-base-libs-gstffts32.html#gst-fft-s32-fft" title="gst_fft_s32_fft ()"><code class="function">gst_fft_s32_fft()</code></a> to get the original data back. |
| The relation between them is iFFT (FFT (x)) = x / nfft where nfft is the |
| length of the FFT. This also has to be taken into account when calculation |
| the magnitude of the frequency data.</p> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gstffts32.functions_details"></a><h2>Functions</h2> |
| <div class="refsect2"> |
| <a name="gst-fft-s32-new"></a><h3>gst_fft_s32_new ()</h3> |
| <pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="returnvalue">GstFFTS32</span></a> * |
| gst_fft_s32_new (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint"><span class="type">gint</span></a> len</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> inverse</code></em>);</pre> |
| <p>This returns a new <a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> instance with the given parameters. It makes |
| sense to keep one instance for several calls for speed reasons.</p> |
| <p><em class="parameter"><code>len</code></em> |
| must be even and to get the best performance a product of |
| 2, 3 and 5. To get the next number with this characteristics use |
| <a class="link" href="gst-plugins-base-libs-gstfft.html#gst-fft-next-fast-length" title="gst_fft_next_fast_length ()"><code class="function">gst_fft_next_fast_length()</code></a>.</p> |
| <p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p> |
| <div class="refsect3"> |
| <a name="gst-fft-s32-new.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>len</p></td> |
| <td class="parameter_description"><p>Length of the FFT in the time domain</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>inverse</p></td> |
| <td class="parameter_description"><p><a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the <a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> instance should be used for the inverse FFT</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <div class="refsect3"> |
| <a name="gst-fft-s32-new.returns"></a><h4>Returns</h4> |
| <p> a new <a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> instance.</p> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-fft-s32-fft"></a><h3>gst_fft_s32_fft ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_fft_s32_fft (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> *self</code></em>, |
| <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint32"><span class="type">gint32</span></a> *timedata</code></em>, |
| <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32Complex" title="struct GstFFTS32Complex"><span class="type">GstFFTS32Complex</span></a> *freqdata</code></em>);</pre> |
| <p>This performs the FFT on <em class="parameter"><code>timedata</code></em> |
| and puts the result in <em class="parameter"><code>freqdata</code></em> |
| .</p> |
| <p><em class="parameter"><code>timedata</code></em> |
| must have as many samples as specified with the <em class="parameter"><code>len</code></em> |
| parameter while |
| allocating the <a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> instance with <a class="link" href="gst-plugins-base-libs-gstffts32.html#gst-fft-s32-new" title="gst_fft_s32_new ()"><code class="function">gst_fft_s32_new()</code></a>.</p> |
| <p><em class="parameter"><code>freqdata</code></em> |
| must be large enough to hold <em class="parameter"><code>len</code></em> |
| /2 + 1 <a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32Complex" title="struct GstFFTS32Complex"><span class="type">GstFFTS32Complex</span></a> frequency |
| domain samples.</p> |
| <div class="refsect3"> |
| <a name="gst-fft-s32-fft.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>self</p></td> |
| <td class="parameter_description"><p><a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> instance for this call</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>timedata</p></td> |
| <td class="parameter_description"><p>Buffer of the samples in the time domain</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>freqdata</p></td> |
| <td class="parameter_description"><p>Target buffer for the samples in the frequency domain</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-fft-s32-inverse-fft"></a><h3>gst_fft_s32_inverse_fft ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_fft_s32_inverse_fft (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> *self</code></em>, |
| <em class="parameter"><code>const <a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32Complex" title="struct GstFFTS32Complex"><span class="type">GstFFTS32Complex</span></a> *freqdata</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint32"><span class="type">gint32</span></a> *timedata</code></em>);</pre> |
| <p>This performs the inverse FFT on <em class="parameter"><code>freqdata</code></em> |
| and puts the result in <em class="parameter"><code>timedata</code></em> |
| .</p> |
| <p><em class="parameter"><code>freqdata</code></em> |
| must have <em class="parameter"><code>len</code></em> |
| /2 + 1 samples, where <em class="parameter"><code>len</code></em> |
| is the parameter specified |
| while allocating the <a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> instance with <a class="link" href="gst-plugins-base-libs-gstffts32.html#gst-fft-s32-new" title="gst_fft_s32_new ()"><code class="function">gst_fft_s32_new()</code></a>.</p> |
| <p><em class="parameter"><code>timedata</code></em> |
| must be large enough to hold <em class="parameter"><code>len</code></em> |
| time domain samples.</p> |
| <div class="refsect3"> |
| <a name="gst-fft-s32-inverse-fft.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>self</p></td> |
| <td class="parameter_description"><p><a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> instance for this call</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>freqdata</p></td> |
| <td class="parameter_description"><p>Buffer of the samples in the frequency domain</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>timedata</p></td> |
| <td class="parameter_description"><p>Target buffer for the samples in the time domain</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-fft-s32-window"></a><h3>gst_fft_s32_window ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_fft_s32_window (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> *self</code></em>, |
| <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint32"><span class="type">gint32</span></a> *timedata</code></em>, |
| <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstfft.html#GstFFTWindow" title="enum GstFFTWindow"><span class="type">GstFFTWindow</span></a> window</code></em>);</pre> |
| <p>This calls the window function <em class="parameter"><code>window</code></em> |
| on the <em class="parameter"><code>timedata</code></em> |
| sample buffer.</p> |
| <div class="refsect3"> |
| <a name="gst-fft-s32-window.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="parameter_name"><p>self</p></td> |
| <td class="parameter_description"><p><a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> instance for this call</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>timedata</p></td> |
| <td class="parameter_description"><p>Time domain samples</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="parameter_name"><p>window</p></td> |
| <td class="parameter_description"><p>Window function to apply</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="gst-fft-s32-free"></a><h3>gst_fft_s32_free ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> |
| gst_fft_s32_free (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> *self</code></em>);</pre> |
| <p>This frees the memory allocated for <em class="parameter"><code>self</code></em> |
| .</p> |
| <div class="refsect3"> |
| <a name="gst-fft-s32-free.parameters"></a><h4>Parameters</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="150px" class="parameters_name"> |
| <col class="parameters_description"> |
| <col width="200px" class="parameters_annotations"> |
| </colgroup> |
| <tbody><tr> |
| <td class="parameter_name"><p>self</p></td> |
| <td class="parameter_description"><p><a class="link" href="gst-plugins-base-libs-gstffts32.html#GstFFTS32" title="GstFFTS32"><span class="type">GstFFTS32</span></a> instance for this call</p></td> |
| <td class="parameter_annotations"> </td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a name="gst-plugins-base-libs-gstffts32.other_details"></a><h2>Types and Values</h2> |
| <div class="refsect2"> |
| <a name="GstFFTS32"></a><h3>GstFFTS32</h3> |
| <pre class="programlisting">typedef struct _GstFFTS32 GstFFTS32;</pre> |
| </div> |
| <hr> |
| <div class="refsect2"> |
| <a name="GstFFTS32Complex"></a><h3>struct GstFFTS32Complex</h3> |
| <pre class="programlisting">struct GstFFTS32Complex { |
| gint32 r; |
| gint32 i; |
| }; |
| </pre> |
| <p>Data type for complex numbers composed of |
| signed 32 bit integers.</p> |
| <div class="refsect3"> |
| <a name="GstFFTS32Complex.members"></a><h4>Members</h4> |
| <div class="informaltable"><table class="informaltable" width="100%" border="0"> |
| <colgroup> |
| <col width="300px" class="struct_members_name"> |
| <col class="struct_members_description"> |
| <col width="200px" class="struct_members_annotations"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint32"><span class="type">gint32</span></a> <em class="structfield"><code><a name="GstFFTS32Complex.r"></a>r</code></em>;</p></td> |
| <td class="struct_member_description"><p>Real part</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| <tr> |
| <td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint32"><span class="type">gint32</span></a> <em class="structfield"><code><a name="GstFFTS32Complex.i"></a>i</code></em>;</p></td> |
| <td class="struct_member_description"><p>Imaginary part</p></td> |
| <td class="struct_member_annotations"> </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="footer"> |
| <hr>Generated by GTK-Doc V1.25</div> |
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