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 <span id="projectnumber">2.7.1</span>
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<div class="title">FFT functions</div> </div>
<div class="ingroups"><a class="el" href="group__lavc__misc.html">Utility functions</a></div></div><!--header-->
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<tr><td colspan="2"><h2><a name="nested-classes"></a>
Data Structures</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structFFTComplex.html">FFTComplex</a></td></tr>
<tr><td colspan="2"><h2><a name="files"></a>
Files</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">file  </td><td class="memItemRight" valign="bottom"><a class="el" href="avfft_8h.html">avfft.h</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight"><p>FFT functions. </p>
<br/></td></tr>
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Typedefs</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">typedef float </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a></td></tr>
<tr><td colspan="2"><h2><a name="enum-members"></a>
Enumerations</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#ga58a704747daba49afa3611cea218a24b">RDFTransformType</a> { <a class="el" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba417b17dd8e9f755f06a9469826e4adc9">DFT_R2C</a>,
<a class="el" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24baadf7acc2f968f4345998fef751bedc8c">IDFT_C2R</a>,
<a class="el" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba5b4ae99ec831a4fc29d1a4bac635cdb6">IDFT_R2C</a>,
<a class="el" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba9709deb5e8ae7c29d950d6d1fad19444">DFT_C2R</a>
}</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#gaeeabd062332b246d19bed36e041d2df6">DCTTransformType</a> { <a class="el" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6aa9d4777883f8c2a1595ded20953287e2">DCT_II</a> = 0,
<a class="el" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6a989cbc292cc725421fac1d88c167f229">DCT_III</a>,
<a class="el" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6a6b14deec67dfefcbf3d873a7e55f9358">DCT_I</a>,
<a class="el" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6aef2c0de34cd8c5582950db643ba88d53">DST_I</a>
}</td></tr>
<tr><td colspan="2"><h2><a name="func-members"></a>
Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#ga6c6b88ddaa9aee5b0ec4e2d09a78e286">av_fft_init</a> (int nbits, int inverse)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set up a complex FFT. <a href="#ga6c6b88ddaa9aee5b0ec4e2d09a78e286"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#ga4d8f70cf57c4f969c99af653b8a82f15">av_fft_permute</a> (<a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *s, <a class="el" href="structFFTComplex.html">FFTComplex</a> *z)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Do the permutation needed BEFORE calling ff_fft_calc(). <a href="#ga4d8f70cf57c4f969c99af653b8a82f15"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#ga4fe79338f98704178512503f87a4af4c">av_fft_calc</a> (<a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *s, <a class="el" href="structFFTComplex.html">FFTComplex</a> *z)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Do a complex FFT with the parameters defined in <a class="el" href="group__lavc__fft.html#ga6c6b88ddaa9aee5b0ec4e2d09a78e286" title="Set up a complex FFT.">av_fft_init()</a>. <a href="#ga4fe79338f98704178512503f87a4af4c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#ga9dd6f59f2d27b37fc047d9dc452c6ba5">av_fft_end</a> (<a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *s)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#ga92059089cd3aa014ca07e18677a05f95">av_mdct_init</a> (int nbits, int inverse, double scale)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#ga356840c227e60047afffbbb34ded5477">av_imdct_calc</a> (<a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *s, <a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *output, const <a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *input)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#ga3597ad2ed7a46ac1bf040c7d9ccefabc">av_imdct_half</a> (<a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *s, <a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *output, const <a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *input)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#gac59dbae80d532741eb8af797b3756eae">av_mdct_calc</a> (<a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *s, <a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *output, const <a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *input)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#gad7543db3d701ce7c0ce789c10d52aa76">av_mdct_end</a> (<a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *s)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#ga5259358e6ddb8f7d02513a3a3bcd3e54">av_rdft_init</a> (int nbits, enum <a class="el" href="group__lavc__fft.html#ga58a704747daba49afa3611cea218a24b">RDFTransformType</a> trans)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set up a real FFT. <a href="#ga5259358e6ddb8f7d02513a3a3bcd3e54"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#ga745b8757713a5a0f0347eddcc6ccc9a4">av_rdft_calc</a> (<a class="el" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a> *s, <a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *data)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#ga9d0be7a2253417ab4bb53a08bb70dfce">av_rdft_end</a> (<a class="el" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a> *s)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#ga64a4f6938a7f836305672ef6a7d23d6c">av_dct_init</a> (int nbits, enum <a class="el" href="group__lavc__fft.html#gaeeabd062332b246d19bed36e041d2df6">DCTTransformType</a> type)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set up DCT. <a href="#ga64a4f6938a7f836305672ef6a7d23d6c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#ga11f6dd46c458176ef8440c7a15bea7d0">av_dct_calc</a> (<a class="el" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a> *s, <a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *data)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__fft.html#gaf529d0ebe6f05c419d4b995322993517">av_dct_end</a> (<a class="el" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a> *s)</td></tr>
</table>
<hr/><h2>Typedef Documentation</h2>
<a class="anchor" id="gaa306dc16df543b25d9910debc3f76b96"></a><!-- doxytag: member="avfft.h::FFTSample" ref="gaa306dc16df543b25d9910debc3f76b96" args="" -->
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<td class="memname">typedef float <a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a></td>
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</div>
<div class="memdoc">
<p>Definition at line <a class="el" href="avfft_8h_source.html#l00035">35</a> of file <a class="el" href="avfft_8h_source.html">avfft.h</a>.</p>
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<a class="anchor" id="gaac01e094370275491c7cbc580de0fe24"></a><!-- doxytag: member="avfft.h::FFTContext" ref="gaac01e094370275491c7cbc580de0fe24" args="" -->
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<td class="memname">typedef struct <a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> <a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a></td>
</tr>
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</div>
<div class="memdoc">
<p>Definition at line <a class="el" href="avfft_8h_source.html#l00041">41</a> of file <a class="el" href="avfft_8h_source.html">avfft.h</a>.</p>
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</div>
<a class="anchor" id="gad6a19df0e8cfc4d67a325e4f91fd9cd9"></a><!-- doxytag: member="avfft.h::RDFTContext" ref="gad6a19df0e8cfc4d67a325e4f91fd9cd9" args="" -->
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<td class="memname">typedef struct <a class="el" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a> <a class="el" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a></td>
</tr>
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</div>
<div class="memdoc">
<p>Definition at line <a class="el" href="avfft_8h_source.html#l00078">78</a> of file <a class="el" href="avfft_8h_source.html">avfft.h</a>.</p>
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<a class="anchor" id="ga904cbe02e46b560fd98d172fdb27c845"></a><!-- doxytag: member="avfft.h::DCTContext" ref="ga904cbe02e46b560fd98d172fdb27c845" args="" -->
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<td class="memname">typedef struct <a class="el" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a> <a class="el" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a></td>
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</table>
</div>
<div class="memdoc">
<p>Definition at line <a class="el" href="avfft_8h_source.html#l00091">91</a> of file <a class="el" href="avfft_8h_source.html">avfft.h</a>.</p>
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</div>
<hr/><h2>Enumeration Type Documentation</h2>
<a class="anchor" id="ga58a704747daba49afa3611cea218a24b"></a><!-- doxytag: member="avfft.h::RDFTransformType" ref="ga58a704747daba49afa3611cea218a24b" args="" -->
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<td class="memname">enum <a class="el" href="group__lavc__fft.html#ga58a704747daba49afa3611cea218a24b">RDFTransformType</a></td>
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<div class="memdoc">
<dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" id="gga58a704747daba49afa3611cea218a24ba417b17dd8e9f755f06a9469826e4adc9"></a><!-- doxytag: member="DFT_R2C" ref="gga58a704747daba49afa3611cea218a24ba417b17dd8e9f755f06a9469826e4adc9" args="" -->DFT_R2C</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="gga58a704747daba49afa3611cea218a24baadf7acc2f968f4345998fef751bedc8c"></a><!-- doxytag: member="IDFT_C2R" ref="gga58a704747daba49afa3611cea218a24baadf7acc2f968f4345998fef751bedc8c" args="" -->IDFT_C2R</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="gga58a704747daba49afa3611cea218a24ba5b4ae99ec831a4fc29d1a4bac635cdb6"></a><!-- doxytag: member="IDFT_R2C" ref="gga58a704747daba49afa3611cea218a24ba5b4ae99ec831a4fc29d1a4bac635cdb6" args="" -->IDFT_R2C</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="gga58a704747daba49afa3611cea218a24ba9709deb5e8ae7c29d950d6d1fad19444"></a><!-- doxytag: member="DFT_C2R" ref="gga58a704747daba49afa3611cea218a24ba9709deb5e8ae7c29d950d6d1fad19444" args="" -->DFT_C2R</em> </td><td>
</td></tr>
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</dd>
</dl>
<p>Definition at line <a class="el" href="avfft_8h_source.html#l00071">71</a> of file <a class="el" href="avfft_8h_source.html">avfft.h</a>.</p>
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<a class="anchor" id="gaeeabd062332b246d19bed36e041d2df6"></a><!-- doxytag: member="avfft.h::DCTTransformType" ref="gaeeabd062332b246d19bed36e041d2df6" args="" -->
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<td class="memname">enum <a class="el" href="group__lavc__fft.html#gaeeabd062332b246d19bed36e041d2df6">DCTTransformType</a></td>
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<div class="memdoc">
<dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" id="ggaeeabd062332b246d19bed36e041d2df6aa9d4777883f8c2a1595ded20953287e2"></a><!-- doxytag: member="DCT_II" ref="ggaeeabd062332b246d19bed36e041d2df6aa9d4777883f8c2a1595ded20953287e2" args="" -->DCT_II</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="ggaeeabd062332b246d19bed36e041d2df6a989cbc292cc725421fac1d88c167f229"></a><!-- doxytag: member="DCT_III" ref="ggaeeabd062332b246d19bed36e041d2df6a989cbc292cc725421fac1d88c167f229" args="" -->DCT_III</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="ggaeeabd062332b246d19bed36e041d2df6a6b14deec67dfefcbf3d873a7e55f9358"></a><!-- doxytag: member="DCT_I" ref="ggaeeabd062332b246d19bed36e041d2df6a6b14deec67dfefcbf3d873a7e55f9358" args="" -->DCT_I</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="ggaeeabd062332b246d19bed36e041d2df6aef2c0de34cd8c5582950db643ba88d53"></a><!-- doxytag: member="DST_I" ref="ggaeeabd062332b246d19bed36e041d2df6aef2c0de34cd8c5582950db643ba88d53" args="" -->DST_I</em> </td><td>
</td></tr>
</table>
</dd>
</dl>
<p>Definition at line <a class="el" href="avfft_8h_source.html#l00093">93</a> of file <a class="el" href="avfft_8h_source.html">avfft.h</a>.</p>
</div>
</div>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="ga6c6b88ddaa9aee5b0ec4e2d09a78e286"></a><!-- doxytag: member="avfft.h::av_fft_init" ref="ga6c6b88ddaa9aee5b0ec4e2d09a78e286" args="(int nbits, int inverse)" -->
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<td class="memname"><a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a>* <a class="el" href="group__lavc__fft.html#ga6c6b88ddaa9aee5b0ec4e2d09a78e286">av_fft_init</a> </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>nbits</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>inverse</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<div class="memdoc">
<p>Set up a complex FFT. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">nbits</td><td>log2 of the length of the input array </td></tr>
<tr><td class="paramname">inverse</td><td>if 0 perform the forward transform, if 1 perform the inverse </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga4d8f70cf57c4f969c99af653b8a82f15"></a><!-- doxytag: member="avfft.h::av_fft_permute" ref="ga4d8f70cf57c4f969c99af653b8a82f15" args="(FFTContext *s, FFTComplex *z)" -->
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<td class="memname">void <a class="el" href="group__lavc__fft.html#ga4d8f70cf57c4f969c99af653b8a82f15">av_fft_permute</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> * </td>
<td class="paramname"><em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structFFTComplex.html">FFTComplex</a> * </td>
<td class="paramname"><em>z</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<div class="memdoc">
<p>Do the permutation needed BEFORE calling ff_fft_calc(). </p>
</div>
</div>
<a class="anchor" id="ga4fe79338f98704178512503f87a4af4c"></a><!-- doxytag: member="avfft.h::av_fft_calc" ref="ga4fe79338f98704178512503f87a4af4c" args="(FFTContext *s, FFTComplex *z)" -->
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<td class="memname">void <a class="el" href="group__lavc__fft.html#ga4fe79338f98704178512503f87a4af4c">av_fft_calc</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> * </td>
<td class="paramname"><em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structFFTComplex.html">FFTComplex</a> * </td>
<td class="paramname"><em>z</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<div class="memdoc">
<p>Do a complex FFT with the parameters defined in <a class="el" href="group__lavc__fft.html#ga6c6b88ddaa9aee5b0ec4e2d09a78e286" title="Set up a complex FFT.">av_fft_init()</a>. </p>
<p>The input data must be permuted before. No 1.0/sqrt(n) normalization is done. </p>
</div>
</div>
<a class="anchor" id="ga9dd6f59f2d27b37fc047d9dc452c6ba5"></a><!-- doxytag: member="avfft.h::av_fft_end" ref="ga9dd6f59f2d27b37fc047d9dc452c6ba5" args="(FFTContext *s)" -->
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<td class="memname">void <a class="el" href="group__lavc__fft.html#ga9dd6f59f2d27b37fc047d9dc452c6ba5">av_fft_end</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> * </td>
<td class="paramname"><em>s</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
</div>
</div>
<a class="anchor" id="ga92059089cd3aa014ca07e18677a05f95"></a><!-- doxytag: member="avfft.h::av_mdct_init" ref="ga92059089cd3aa014ca07e18677a05f95" args="(int nbits, int inverse, double scale)" -->
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<td class="memname"><a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a>* <a class="el" href="group__lavc__fft.html#ga92059089cd3aa014ca07e18677a05f95">av_mdct_init</a> </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>nbits</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>inverse</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"><em>scale</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<div class="memdoc">
</div>
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<a class="anchor" id="ga356840c227e60047afffbbb34ded5477"></a><!-- doxytag: member="avfft.h::av_imdct_calc" ref="ga356840c227e60047afffbbb34ded5477" args="(FFTContext *s, FFTSample *output, const FFTSample *input)" -->
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<td class="memname">void <a class="el" href="group__lavc__fft.html#ga356840c227e60047afffbbb34ded5477">av_imdct_calc</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> * </td>
<td class="paramname"><em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> * </td>
<td class="paramname"><em>output</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> * </td>
<td class="paramname"><em>input</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
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<div class="memdoc">
</div>
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<a class="anchor" id="ga3597ad2ed7a46ac1bf040c7d9ccefabc"></a><!-- doxytag: member="avfft.h::av_imdct_half" ref="ga3597ad2ed7a46ac1bf040c7d9ccefabc" args="(FFTContext *s, FFTSample *output, const FFTSample *input)" -->
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<td class="memname">void <a class="el" href="group__lavc__fft.html#ga3597ad2ed7a46ac1bf040c7d9ccefabc">av_imdct_half</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> * </td>
<td class="paramname"><em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> * </td>
<td class="paramname"><em>output</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> * </td>
<td class="paramname"><em>input</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
</div>
</div>
<a class="anchor" id="gac59dbae80d532741eb8af797b3756eae"></a><!-- doxytag: member="avfft.h::av_mdct_calc" ref="gac59dbae80d532741eb8af797b3756eae" args="(FFTContext *s, FFTSample *output, const FFTSample *input)" -->
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<td class="memname">void <a class="el" href="group__lavc__fft.html#gac59dbae80d532741eb8af797b3756eae">av_mdct_calc</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> * </td>
<td class="paramname"><em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> * </td>
<td class="paramname"><em>output</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> * </td>
<td class="paramname"><em>input</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
</div>
</div>
<a class="anchor" id="gad7543db3d701ce7c0ce789c10d52aa76"></a><!-- doxytag: member="avfft.h::av_mdct_end" ref="gad7543db3d701ce7c0ce789c10d52aa76" args="(FFTContext *s)" -->
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<td class="memname">void <a class="el" href="group__lavc__fft.html#gad7543db3d701ce7c0ce789c10d52aa76">av_mdct_end</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> * </td>
<td class="paramname"><em>s</em></td><td>)</td>
<td></td>
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</table>
</div>
<div class="memdoc">
</div>
</div>
<a class="anchor" id="ga5259358e6ddb8f7d02513a3a3bcd3e54"></a><!-- doxytag: member="avfft.h::av_rdft_init" ref="ga5259358e6ddb8f7d02513a3a3bcd3e54" args="(int nbits, enum RDFTransformType trans)" -->
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<td class="memname"><a class="el" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a>* <a class="el" href="group__lavc__fft.html#ga5259358e6ddb8f7d02513a3a3bcd3e54">av_rdft_init</a> </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>nbits</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">enum <a class="el" href="group__lavc__fft.html#ga58a704747daba49afa3611cea218a24b">RDFTransformType</a> </td>
<td class="paramname"><em>trans</em> </td>
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<td>)</td>
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<p>Set up a real FFT. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">nbits</td><td>log2 of the length of the input array </td></tr>
<tr><td class="paramname">trans</td><td>the type of transform </td></tr>
</table>
</dd>
</dl>
</div>
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<a class="anchor" id="ga745b8757713a5a0f0347eddcc6ccc9a4"></a><!-- doxytag: member="avfft.h::av_rdft_calc" ref="ga745b8757713a5a0f0347eddcc6ccc9a4" args="(RDFTContext *s, FFTSample *data)" -->
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<td class="memname">void <a class="el" href="group__lavc__fft.html#ga745b8757713a5a0f0347eddcc6ccc9a4">av_rdft_calc</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a> * </td>
<td class="paramname"><em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> * </td>
<td class="paramname"><em>data</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
</div>
</div>
<a class="anchor" id="ga9d0be7a2253417ab4bb53a08bb70dfce"></a><!-- doxytag: member="avfft.h::av_rdft_end" ref="ga9d0be7a2253417ab4bb53a08bb70dfce" args="(RDFTContext *s)" -->
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<td class="memname">void <a class="el" href="group__lavc__fft.html#ga9d0be7a2253417ab4bb53a08bb70dfce">av_rdft_end</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a> * </td>
<td class="paramname"><em>s</em></td><td>)</td>
<td></td>
</tr>
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<div class="memdoc">
</div>
</div>
<a class="anchor" id="ga64a4f6938a7f836305672ef6a7d23d6c"></a><!-- doxytag: member="avfft.h::av_dct_init" ref="ga64a4f6938a7f836305672ef6a7d23d6c" args="(int nbits, enum DCTTransformType type)" -->
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<table class="memname">
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<td class="memname"><a class="el" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a>* <a class="el" href="group__lavc__fft.html#ga64a4f6938a7f836305672ef6a7d23d6c">av_dct_init</a> </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>nbits</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">enum <a class="el" href="group__lavc__fft.html#gaeeabd062332b246d19bed36e041d2df6">DCTTransformType</a> </td>
<td class="paramname"><em>type</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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</div>
<div class="memdoc">
<p>Set up DCT. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">nbits</td><td>size of the input array: (1 << nbits) for DCT-II, DCT-III and DST-I (1 << nbits) + 1 for DCT-I </td></tr>
<tr><td class="paramname">type</td><td>the type of transform</td></tr>
</table>
</dd>
</dl>
<dl class="note"><dt><b>Note:</b></dt><dd>the first element of the input of DST-I is ignored </dd></dl>
</div>
</div>
<a class="anchor" id="ga11f6dd46c458176ef8440c7a15bea7d0"></a><!-- doxytag: member="avfft.h::av_dct_calc" ref="ga11f6dd46c458176ef8440c7a15bea7d0" args="(DCTContext *s, FFTSample *data)" -->
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<td class="memname">void <a class="el" href="group__lavc__fft.html#ga11f6dd46c458176ef8440c7a15bea7d0">av_dct_calc</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a> * </td>
<td class="paramname"><em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> * </td>
<td class="paramname"><em>data</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
</div>
</div>
<a class="anchor" id="gaf529d0ebe6f05c419d4b995322993517"></a><!-- doxytag: member="avfft.h::av_dct_end" ref="gaf529d0ebe6f05c419d4b995322993517" args="(DCTContext *s)" -->
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<td class="memname">void <a class="el" href="group__lavc__fft.html#gaf529d0ebe6f05c419d4b995322993517">av_dct_end</a> </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a> * </td>
<td class="paramname"><em>s</em></td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
</div>
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