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<div class="title">libavcodec/avfft.h File Reference<div class="ingroups"><a class="el" href="group__lavc__fft.html">FFT functions</a></div></div> </div>
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<p>FFT functions.
<a href="#details">More...</a></p>
<p><a href="avfft_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<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>
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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>
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<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>
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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="group__lavc__fft.html#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="group__lavc__fft.html#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="group__lavc__fft.html#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="group__lavc__fft.html#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="group__lavc__fft.html#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/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>FFT functions. </p>
<p>Definition in file <a class="el" href="avfft_8h_source.html">avfft.h</a>.</p>
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