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<a href="avfft_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * This file is part of FFmpeg.</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * FFmpeg is free software; you can redistribute it and/or</span>
<a name="l00005"></a>00005 <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span>
<a name="l00006"></a>00006 <span class="comment"> * License as published by the Free Software Foundation; either</span>
<a name="l00007"></a>00007 <span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span>
<a name="l00008"></a>00008 <span class="comment"> *</span>
<a name="l00009"></a>00009 <span class="comment"> * FFmpeg is distributed in the hope that it will be useful,</span>
<a name="l00010"></a>00010 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00011"></a>00011 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00012"></a>00012 <span class="comment"> * Lesser General Public License for more details.</span>
<a name="l00013"></a>00013 <span class="comment"> *</span>
<a name="l00014"></a>00014 <span class="comment"> * You should have received a copy of the GNU Lesser General Public</span>
<a name="l00015"></a>00015 <span class="comment"> * License along with FFmpeg; if not, write to the Free Software</span>
<a name="l00016"></a>00016 <span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span>
<a name="l00017"></a>00017 <span class="comment"> */</span>
<a name="l00018"></a>00018
<a name="l00019"></a>00019 <span class="preprocessor">#ifndef AVCODEC_AVFFT_H</span>
<a name="l00020"></a>00020 <span class="preprocessor"></span><span class="preprocessor">#define AVCODEC_AVFFT_H</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00022"></a>00022 <span class="comment">/**</span>
<a name="l00023"></a>00023 <span class="comment"> * @file</span>
<a name="l00024"></a>00024 <span class="comment"> * @ingroup lavc_fft</span>
<a name="l00025"></a>00025 <span class="comment"> * FFT functions</span>
<a name="l00026"></a>00026 <span class="comment"> */</span>
<a name="l00027"></a>00027 <span class="comment"></span>
<a name="l00028"></a>00028 <span class="comment">/**</span>
<a name="l00029"></a>00029 <span class="comment"> * @defgroup lavc_fft FFT functions</span>
<a name="l00030"></a>00030 <span class="comment"> * @ingroup lavc_misc</span>
<a name="l00031"></a>00031 <span class="comment"> *</span>
<a name="l00032"></a>00032 <span class="comment"> * @{</span>
<a name="l00033"></a>00033 <span class="comment"> */</span>
<a name="l00034"></a>00034
<a name="l00035"></a><a class="code" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">00035</a> <span class="keyword">typedef</span> <span class="keywordtype">float</span> <a class="code" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a>;
<a name="l00036"></a>00036
<a name="l00037"></a><a class="code" href="structFFTComplex.html">00037</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structFFTComplex.html">FFTComplex</a> {
<a name="l00038"></a><a class="code" href="structFFTComplex.html#a1fe3a8dd90a15a477065508b9319df6a">00038</a> <a class="code" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> <a class="code" href="structFFTComplex.html#a1fe3a8dd90a15a477065508b9319df6a">re</a>, <a class="code" href="structFFTComplex.html#a69b2491bd684836a7a9350dcbdbb886b">im</a>;
<a name="l00039"></a>00039 } <a class="code" href="structFFTComplex.html">FFTComplex</a>;
<a name="l00040"></a>00040
<a name="l00041"></a><a class="code" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">00041</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> <a class="code" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a>;
<a name="l00042"></a>00042 <span class="comment"></span>
<a name="l00043"></a>00043 <span class="comment">/**</span>
<a name="l00044"></a>00044 <span class="comment"> * Set up a complex FFT.</span>
<a name="l00045"></a>00045 <span class="comment"> * @param nbits log2 of the length of the input array</span>
<a name="l00046"></a>00046 <span class="comment"> * @param inverse if 0 perform the forward transform, if 1 perform the inverse</span>
<a name="l00047"></a>00047 <span class="comment"> */</span>
<a name="l00048"></a>00048 <a class="code" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *<a class="code" href="group__lavc__fft.html#ga6c6b88ddaa9aee5b0ec4e2d09a78e286" title="Set up a complex FFT.">av_fft_init</a>(<span class="keywordtype">int</span> nbits, <span class="keywordtype">int</span> inverse);
<a name="l00049"></a>00049 <span class="comment"></span>
<a name="l00050"></a>00050 <span class="comment">/**</span>
<a name="l00051"></a>00051 <span class="comment"> * Do the permutation needed BEFORE calling ff_fft_calc().</span>
<a name="l00052"></a>00052 <span class="comment"> */</span>
<a name="l00053"></a>00053 <span class="keywordtype">void</span> <a class="code" href="group__lavc__fft.html#ga4d8f70cf57c4f969c99af653b8a82f15" title="Do the permutation needed BEFORE calling ff_fft_calc().">av_fft_permute</a>(<a class="code" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *s, <a class="code" href="structFFTComplex.html">FFTComplex</a> *z);
<a name="l00054"></a>00054 <span class="comment"></span>
<a name="l00055"></a>00055 <span class="comment">/**</span>
<a name="l00056"></a>00056 <span class="comment"> * Do a complex FFT with the parameters defined in av_fft_init(). The</span>
<a name="l00057"></a>00057 <span class="comment"> * input data must be permuted before. No 1.0/sqrt(n) normalization is done.</span>
<a name="l00058"></a>00058 <span class="comment"> */</span>
<a name="l00059"></a>00059 <span class="keywordtype">void</span> <a class="code" href="group__lavc__fft.html#ga4fe79338f98704178512503f87a4af4c" title="Do a complex FFT with the parameters defined in av_fft_init().">av_fft_calc</a>(<a class="code" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *s, <a class="code" href="structFFTComplex.html">FFTComplex</a> *z);
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="keywordtype">void</span> <a class="code" href="group__lavc__fft.html#ga9dd6f59f2d27b37fc047d9dc452c6ba5">av_fft_end</a>(<a class="code" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *s);
<a name="l00062"></a>00062
<a name="l00063"></a>00063 <a class="code" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *<a class="code" href="group__lavc__fft.html#ga92059089cd3aa014ca07e18677a05f95">av_mdct_init</a>(<span class="keywordtype">int</span> nbits, <span class="keywordtype">int</span> inverse, <span class="keywordtype">double</span> scale);
<a name="l00064"></a>00064 <span class="keywordtype">void</span> <a class="code" href="group__lavc__fft.html#ga356840c227e60047afffbbb34ded5477">av_imdct_calc</a>(<a class="code" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *s, <a class="code" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *output, <span class="keyword">const</span> <a class="code" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *input);
<a name="l00065"></a>00065 <span class="keywordtype">void</span> <a class="code" href="group__lavc__fft.html#ga3597ad2ed7a46ac1bf040c7d9ccefabc">av_imdct_half</a>(<a class="code" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *s, <a class="code" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *output, <span class="keyword">const</span> <a class="code" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *input);
<a name="l00066"></a>00066 <span class="keywordtype">void</span> <a class="code" href="group__lavc__fft.html#gac59dbae80d532741eb8af797b3756eae">av_mdct_calc</a>(<a class="code" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *s, <a class="code" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *output, <span class="keyword">const</span> <a class="code" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *input);
<a name="l00067"></a>00067 <span class="keywordtype">void</span> <a class="code" href="group__lavc__fft.html#gad7543db3d701ce7c0ce789c10d52aa76">av_mdct_end</a>(<a class="code" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *s);
<a name="l00068"></a>00068
<a name="l00069"></a>00069 <span class="comment">/* Real Discrete Fourier Transform */</span>
<a name="l00070"></a>00070
<a name="l00071"></a><a class="code" href="group__lavc__fft.html#ga58a704747daba49afa3611cea218a24b">00071</a> <span class="keyword">enum</span> <a class="code" href="group__lavc__fft.html#ga58a704747daba49afa3611cea218a24b">RDFTransformType</a> {
<a name="l00072"></a><a class="code" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba417b17dd8e9f755f06a9469826e4adc9">00072</a> <a class="code" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba417b17dd8e9f755f06a9469826e4adc9">DFT_R2C</a>,
<a name="l00073"></a><a class="code" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24baadf7acc2f968f4345998fef751bedc8c">00073</a> <a class="code" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24baadf7acc2f968f4345998fef751bedc8c">IDFT_C2R</a>,
<a name="l00074"></a><a class="code" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba5b4ae99ec831a4fc29d1a4bac635cdb6">00074</a> <a class="code" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba5b4ae99ec831a4fc29d1a4bac635cdb6">IDFT_R2C</a>,
<a name="l00075"></a><a class="code" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba9709deb5e8ae7c29d950d6d1fad19444">00075</a> <a class="code" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba9709deb5e8ae7c29d950d6d1fad19444">DFT_C2R</a>,
<a name="l00076"></a>00076 };
<a name="l00077"></a>00077
<a name="l00078"></a><a class="code" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">00078</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a> <a class="code" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a>;
<a name="l00079"></a>00079 <span class="comment"></span>
<a name="l00080"></a>00080 <span class="comment">/**</span>
<a name="l00081"></a>00081 <span class="comment"> * Set up a real FFT.</span>
<a name="l00082"></a>00082 <span class="comment"> * @param nbits log2 of the length of the input array</span>
<a name="l00083"></a>00083 <span class="comment"> * @param trans the type of transform</span>
<a name="l00084"></a>00084 <span class="comment"> */</span>
<a name="l00085"></a>00085 <a class="code" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a> *<a class="code" href="group__lavc__fft.html#ga5259358e6ddb8f7d02513a3a3bcd3e54" title="Set up a real FFT.">av_rdft_init</a>(<span class="keywordtype">int</span> nbits, <span class="keyword">enum</span> <a class="code" href="group__lavc__fft.html#ga58a704747daba49afa3611cea218a24b">RDFTransformType</a> trans);
<a name="l00086"></a>00086 <span class="keywordtype">void</span> <a class="code" href="group__lavc__fft.html#ga745b8757713a5a0f0347eddcc6ccc9a4">av_rdft_calc</a>(<a class="code" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a> *s, <a class="code" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *data);
<a name="l00087"></a>00087 <span class="keywordtype">void</span> <a class="code" href="group__lavc__fft.html#ga9d0be7a2253417ab4bb53a08bb70dfce">av_rdft_end</a>(<a class="code" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a> *s);
<a name="l00088"></a>00088
<a name="l00089"></a>00089 <span class="comment">/* Discrete Cosine Transform */</span>
<a name="l00090"></a>00090
<a name="l00091"></a><a class="code" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">00091</a> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a> <a class="code" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a>;
<a name="l00092"></a>00092
<a name="l00093"></a><a class="code" href="group__lavc__fft.html#gaeeabd062332b246d19bed36e041d2df6">00093</a> <span class="keyword">enum</span> <a class="code" href="group__lavc__fft.html#gaeeabd062332b246d19bed36e041d2df6">DCTTransformType</a> {
<a name="l00094"></a><a class="code" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6aa9d4777883f8c2a1595ded20953287e2">00094</a> <a class="code" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6aa9d4777883f8c2a1595ded20953287e2">DCT_II</a> = 0,
<a name="l00095"></a><a class="code" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6a989cbc292cc725421fac1d88c167f229">00095</a> <a class="code" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6a989cbc292cc725421fac1d88c167f229">DCT_III</a>,
<a name="l00096"></a><a class="code" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6a6b14deec67dfefcbf3d873a7e55f9358">00096</a> <a class="code" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6a6b14deec67dfefcbf3d873a7e55f9358">DCT_I</a>,
<a name="l00097"></a><a class="code" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6aef2c0de34cd8c5582950db643ba88d53">00097</a> <a class="code" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6aef2c0de34cd8c5582950db643ba88d53">DST_I</a>,
<a name="l00098"></a>00098 };
<a name="l00099"></a>00099 <span class="comment"></span>
<a name="l00100"></a>00100 <span class="comment">/**</span>
<a name="l00101"></a>00101 <span class="comment"> * Set up DCT.</span>
<a name="l00102"></a>00102 <span class="comment"> *</span>
<a name="l00103"></a>00103 <span class="comment"> * @param nbits size of the input array:</span>
<a name="l00104"></a>00104 <span class="comment"> * (1 << nbits) for DCT-II, DCT-III and DST-I</span>
<a name="l00105"></a>00105 <span class="comment"> * (1 << nbits) + 1 for DCT-I</span>
<a name="l00106"></a>00106 <span class="comment"> * @param type the type of transform</span>
<a name="l00107"></a>00107 <span class="comment"> *</span>
<a name="l00108"></a>00108 <span class="comment"> * @note the first element of the input of DST-I is ignored</span>
<a name="l00109"></a>00109 <span class="comment"> */</span>
<a name="l00110"></a>00110 <a class="code" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a> *<a class="code" href="group__lavc__fft.html#ga64a4f6938a7f836305672ef6a7d23d6c" title="Set up DCT.">av_dct_init</a>(<span class="keywordtype">int</span> nbits, <span class="keyword">enum</span> <a class="code" href="group__lavc__fft.html#gaeeabd062332b246d19bed36e041d2df6">DCTTransformType</a> type);
<a name="l00111"></a>00111 <span class="keywordtype">void</span> <a class="code" href="group__lavc__fft.html#ga11f6dd46c458176ef8440c7a15bea7d0">av_dct_calc</a>(<a class="code" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a> *s, <a class="code" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a> *data);
<a name="l00112"></a>00112 <span class="keywordtype">void</span> <a class="code" href="group__lavc__fft.html#gaf529d0ebe6f05c419d4b995322993517">av_dct_end</a> (<a class="code" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a> *s);
<a name="l00113"></a>00113 <span class="comment"></span>
<a name="l00114"></a>00114 <span class="comment">/**</span>
<a name="l00115"></a>00115 <span class="comment"> * @}</span>
<a name="l00116"></a>00116 <span class="comment"> */</span>
<a name="l00117"></a>00117
<a name="l00118"></a>00118 <span class="preprocessor">#endif </span><span class="comment">/* AVCODEC_AVFFT_H */</span>
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