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<a href="avfft_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * This file is part of FFmpeg.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * FFmpeg is free software; you can redistribute it and/or</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * License as published by the Free Software Foundation; either</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * FFmpeg is distributed in the hope that it will be useful,</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * Lesser General Public License for more details.</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * You should have received a copy of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * License along with FFmpeg; if not, write to the Free Software</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#ifndef AVCODEC_AVFFT_H</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor"></span><span class="preprocessor">#define AVCODEC_AVFFT_H</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor"></span><span class="comment"></span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * @file</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * @ingroup lavc_fft</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * FFT functions</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"></span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * @defgroup lavc_fft FFT functions</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * @ingroup lavc_misc</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * @{</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div>
<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96"> 35</a></span> <span class="keyword">typedef</span> <span class="keywordtype">float</span> <a class="code" href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a>;</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div>
<div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="structFFTComplex.html"> 37</a></span> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structFFTComplex.html">FFTComplex</a> {</div>
<div class="line"><a name="l00038"></a><span class="lineno"><a class="line" href="structFFTComplex.html#a1fe3a8dd90a15a477065508b9319df6a"> 38</a></span>  <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>;</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> } <a class="code" href="structFFTComplex.html">FFTComplex</a>;</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div>
<div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24"> 41</a></span> <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>;</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"></span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> * Set up a complex FFT.</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> * @param nbits log2 of the length of the input array</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> * @param inverse if 0 perform the forward transform, if 1 perform the inverse</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <a class="code" href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a> *<a class="code" href="group__lavc__fft.html#ga6c6b88ddaa9aee5b0ec4e2d09a78e286">av_fft_init</a>(<span class="keywordtype">int</span> nbits, <span class="keywordtype">int</span> inverse);</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"></span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> * Do the permutation needed BEFORE calling ff_fft_calc().</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="keywordtype">void</span> <a class="code" href="group__lavc__fft.html#ga4d8f70cf57c4f969c99af653b8a82f15">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);</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"></span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> * Do a complex FFT with the parameters defined in av_fft_init(). The</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> * input data must be permuted before. No 1.0/sqrt(n) normalization is done.</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="keywordtype">void</span> <a class="code" href="group__lavc__fft.html#ga4fe79338f98704178512503f87a4af4c">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);</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> </div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <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);</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <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);</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <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);</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <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);</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <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);</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <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);</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment">/* Real Discrete Fourier Transform */</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div>
<div class="line"><a name="l00071"></a><span class="lineno"><a class="line" href="group__lavc__fft.html#ga58a704747daba49afa3611cea218a24b"> 71</a></span> <span class="keyword">enum</span> <a class="code" href="group__lavc__fft.html#ga58a704747daba49afa3611cea218a24b">RDFTransformType</a> {</div>
<div class="line"><a name="l00072"></a><span class="lineno"><a class="line" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba417b17dd8e9f755f06a9469826e4adc9"> 72</a></span>  <a class="code" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba417b17dd8e9f755f06a9469826e4adc9">DFT_R2C</a>,</div>
<div class="line"><a name="l00073"></a><span class="lineno"><a class="line" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24baadf7acc2f968f4345998fef751bedc8c"> 73</a></span>  <a class="code" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24baadf7acc2f968f4345998fef751bedc8c">IDFT_C2R</a>,</div>
<div class="line"><a name="l00074"></a><span class="lineno"><a class="line" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba5b4ae99ec831a4fc29d1a4bac635cdb6"> 74</a></span>  <a class="code" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba5b4ae99ec831a4fc29d1a4bac635cdb6">IDFT_R2C</a>,</div>
<div class="line"><a name="l00075"></a><span class="lineno"><a class="line" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba9709deb5e8ae7c29d950d6d1fad19444"> 75</a></span>  <a class="code" href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba9709deb5e8ae7c29d950d6d1fad19444">DFT_C2R</a>,</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> };</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div>
<div class="line"><a name="l00078"></a><span class="lineno"><a class="line" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9"> 78</a></span> <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>;</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"></span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> * Set up a real FFT.</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> * @param nbits log2 of the length of the input array</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> * @param trans the type of transform</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <a class="code" href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a> *<a class="code" href="group__lavc__fft.html#ga5259358e6ddb8f7d02513a3a3bcd3e54">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);</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <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);</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <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);</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> </div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment">/* Discrete Cosine Transform */</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div>
<div class="line"><a name="l00091"></a><span class="lineno"><a class="line" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845"> 91</a></span> <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>;</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div>
<div class="line"><a name="l00093"></a><span class="lineno"><a class="line" href="group__lavc__fft.html#gaeeabd062332b246d19bed36e041d2df6"> 93</a></span> <span class="keyword">enum</span> <a class="code" href="group__lavc__fft.html#gaeeabd062332b246d19bed36e041d2df6">DCTTransformType</a> {</div>
<div class="line"><a name="l00094"></a><span class="lineno"><a class="line" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6aa9d4777883f8c2a1595ded20953287e2"> 94</a></span>  <a class="code" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6aa9d4777883f8c2a1595ded20953287e2">DCT_II</a> = 0,</div>
<div class="line"><a name="l00095"></a><span class="lineno"><a class="line" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6a989cbc292cc725421fac1d88c167f229"> 95</a></span>  <a class="code" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6a989cbc292cc725421fac1d88c167f229">DCT_III</a>,</div>
<div class="line"><a name="l00096"></a><span class="lineno"><a class="line" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6a6b14deec67dfefcbf3d873a7e55f9358"> 96</a></span>  <a class="code" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6a6b14deec67dfefcbf3d873a7e55f9358">DCT_I</a>,</div>
<div class="line"><a name="l00097"></a><span class="lineno"><a class="line" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6aef2c0de34cd8c5582950db643ba88d53"> 97</a></span>  <a class="code" href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6aef2c0de34cd8c5582950db643ba88d53">DST_I</a>,</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> };</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"></span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> * Set up DCT.</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> * @param nbits size of the input array:</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> * (1 << nbits) for DCT-II, DCT-III and DST-I</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> * (1 << nbits) + 1 for DCT-I</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> * @param type the type of transform</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment"> * @note the first element of the input of DST-I is ignored</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <a class="code" href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a> *<a class="code" href="group__lavc__fft.html#ga64a4f6938a7f836305672ef6a7d23d6c">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);</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <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);</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <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);</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="comment"></span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> * @}</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="preprocessor">#endif </span><span class="comment">/* AVCODEC_AVFFT_H */</span><span class="preprocessor"></span></div>
<div class="ttc" id="group__lavc__fft_html_gga58a704747daba49afa3611cea218a24ba9709deb5e8ae7c29d950d6d1fad19444"><div class="ttname"><a href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba9709deb5e8ae7c29d950d6d1fad19444">DFT_C2R</a></div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00075">avfft.h:75</a></div></div>
<div class="ttc" id="group__lavc__fft_html_ga9dd6f59f2d27b37fc047d9dc452c6ba5"><div class="ttname"><a href="group__lavc__fft.html#ga9dd6f59f2d27b37fc047d9dc452c6ba5">av_fft_end</a></div><div class="ttdeci">void av_fft_end(FFTContext *s)</div></div>
<div class="ttc" id="group__lavc__fft_html_gad7543db3d701ce7c0ce789c10d52aa76"><div class="ttname"><a href="group__lavc__fft.html#gad7543db3d701ce7c0ce789c10d52aa76">av_mdct_end</a></div><div class="ttdeci">void av_mdct_end(FFTContext *s)</div></div>
<div class="ttc" id="group__lavc__fft_html_ggaeeabd062332b246d19bed36e041d2df6a989cbc292cc725421fac1d88c167f229"><div class="ttname"><a href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6a989cbc292cc725421fac1d88c167f229">DCT_III</a></div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00095">avfft.h:95</a></div></div>
<div class="ttc" id="group__lavc__fft_html_ga92059089cd3aa014ca07e18677a05f95"><div class="ttname"><a href="group__lavc__fft.html#ga92059089cd3aa014ca07e18677a05f95">av_mdct_init</a></div><div class="ttdeci">FFTContext * av_mdct_init(int nbits, int inverse, double scale)</div></div>
<div class="ttc" id="group__lavc__fft_html_ga64a4f6938a7f836305672ef6a7d23d6c"><div class="ttname"><a href="group__lavc__fft.html#ga64a4f6938a7f836305672ef6a7d23d6c">av_dct_init</a></div><div class="ttdeci">DCTContext * av_dct_init(int nbits, enum DCTTransformType type)</div><div class="ttdoc">Set up DCT. </div></div>
<div class="ttc" id="structFFTComplex_html_a1fe3a8dd90a15a477065508b9319df6a"><div class="ttname"><a href="structFFTComplex.html#a1fe3a8dd90a15a477065508b9319df6a">FFTComplex::re</a></div><div class="ttdeci">FFTSample re</div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00038">avfft.h:38</a></div></div>
<div class="ttc" id="group__lavc__fft_html_ga4d8f70cf57c4f969c99af653b8a82f15"><div class="ttname"><a href="group__lavc__fft.html#ga4d8f70cf57c4f969c99af653b8a82f15">av_fft_permute</a></div><div class="ttdeci">void av_fft_permute(FFTContext *s, FFTComplex *z)</div><div class="ttdoc">Do the permutation needed BEFORE calling ff_fft_calc(). </div></div>
<div class="ttc" id="group__lavc__fft_html_ga904cbe02e46b560fd98d172fdb27c845"><div class="ttname"><a href="group__lavc__fft.html#ga904cbe02e46b560fd98d172fdb27c845">DCTContext</a></div><div class="ttdeci">struct DCTContext DCTContext</div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00091">avfft.h:91</a></div></div>
<div class="ttc" id="group__lavc__fft_html_ga58a704747daba49afa3611cea218a24b"><div class="ttname"><a href="group__lavc__fft.html#ga58a704747daba49afa3611cea218a24b">RDFTransformType</a></div><div class="ttdeci">RDFTransformType</div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00071">avfft.h:71</a></div></div>
<div class="ttc" id="group__lavc__fft_html_ga3597ad2ed7a46ac1bf040c7d9ccefabc"><div class="ttname"><a href="group__lavc__fft.html#ga3597ad2ed7a46ac1bf040c7d9ccefabc">av_imdct_half</a></div><div class="ttdeci">void av_imdct_half(FFTContext *s, FFTSample *output, const FFTSample *input)</div></div>
<div class="ttc" id="group__lavc__fft_html_gaeeabd062332b246d19bed36e041d2df6"><div class="ttname"><a href="group__lavc__fft.html#gaeeabd062332b246d19bed36e041d2df6">DCTTransformType</a></div><div class="ttdeci">DCTTransformType</div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00093">avfft.h:93</a></div></div>
<div class="ttc" id="group__lavc__fft_html_gga58a704747daba49afa3611cea218a24baadf7acc2f968f4345998fef751bedc8c"><div class="ttname"><a href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24baadf7acc2f968f4345998fef751bedc8c">IDFT_C2R</a></div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00073">avfft.h:73</a></div></div>
<div class="ttc" id="group__lavc__fft_html_ga6c6b88ddaa9aee5b0ec4e2d09a78e286"><div class="ttname"><a href="group__lavc__fft.html#ga6c6b88ddaa9aee5b0ec4e2d09a78e286">av_fft_init</a></div><div class="ttdeci">FFTContext * av_fft_init(int nbits, int inverse)</div><div class="ttdoc">Set up a complex FFT. </div></div>
<div class="ttc" id="group__lavc__fft_html_gaa306dc16df543b25d9910debc3f76b96"><div class="ttname"><a href="group__lavc__fft.html#gaa306dc16df543b25d9910debc3f76b96">FFTSample</a></div><div class="ttdeci">float FFTSample</div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00035">avfft.h:35</a></div></div>
<div class="ttc" id="group__lavc__fft_html_ga745b8757713a5a0f0347eddcc6ccc9a4"><div class="ttname"><a href="group__lavc__fft.html#ga745b8757713a5a0f0347eddcc6ccc9a4">av_rdft_calc</a></div><div class="ttdeci">void av_rdft_calc(RDFTContext *s, FFTSample *data)</div></div>
<div class="ttc" id="group__lavc__fft_html_ggaeeabd062332b246d19bed36e041d2df6aef2c0de34cd8c5582950db643ba88d53"><div class="ttname"><a href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6aef2c0de34cd8c5582950db643ba88d53">DST_I</a></div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00097">avfft.h:97</a></div></div>
<div class="ttc" id="group__lavc__fft_html_gga58a704747daba49afa3611cea218a24ba417b17dd8e9f755f06a9469826e4adc9"><div class="ttname"><a href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba417b17dd8e9f755f06a9469826e4adc9">DFT_R2C</a></div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00072">avfft.h:72</a></div></div>
<div class="ttc" id="group__lavc__fft_html_ga9d0be7a2253417ab4bb53a08bb70dfce"><div class="ttname"><a href="group__lavc__fft.html#ga9d0be7a2253417ab4bb53a08bb70dfce">av_rdft_end</a></div><div class="ttdeci">void av_rdft_end(RDFTContext *s)</div></div>
<div class="ttc" id="group__lavc__fft_html_ga5259358e6ddb8f7d02513a3a3bcd3e54"><div class="ttname"><a href="group__lavc__fft.html#ga5259358e6ddb8f7d02513a3a3bcd3e54">av_rdft_init</a></div><div class="ttdeci">RDFTContext * av_rdft_init(int nbits, enum RDFTransformType trans)</div><div class="ttdoc">Set up a real FFT. </div></div>
<div class="ttc" id="group__lavc__fft_html_gga58a704747daba49afa3611cea218a24ba5b4ae99ec831a4fc29d1a4bac635cdb6"><div class="ttname"><a href="group__lavc__fft.html#gga58a704747daba49afa3611cea218a24ba5b4ae99ec831a4fc29d1a4bac635cdb6">IDFT_R2C</a></div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00074">avfft.h:74</a></div></div>
<div class="ttc" id="group__lavc__fft_html_ga356840c227e60047afffbbb34ded5477"><div class="ttname"><a href="group__lavc__fft.html#ga356840c227e60047afffbbb34ded5477">av_imdct_calc</a></div><div class="ttdeci">void av_imdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input)</div></div>
<div class="ttc" id="group__lavc__fft_html_gaf529d0ebe6f05c419d4b995322993517"><div class="ttname"><a href="group__lavc__fft.html#gaf529d0ebe6f05c419d4b995322993517">av_dct_end</a></div><div class="ttdeci">void av_dct_end(DCTContext *s)</div></div>
<div class="ttc" id="structFFTComplex_html"><div class="ttname"><a href="structFFTComplex.html">FFTComplex</a></div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00037">avfft.h:37</a></div></div>
<div class="ttc" id="structFFTComplex_html_a69b2491bd684836a7a9350dcbdbb886b"><div class="ttname"><a href="structFFTComplex.html#a69b2491bd684836a7a9350dcbdbb886b">FFTComplex::im</a></div><div class="ttdeci">FFTSample im</div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00038">avfft.h:38</a></div></div>
<div class="ttc" id="group__lavc__fft_html_ggaeeabd062332b246d19bed36e041d2df6aa9d4777883f8c2a1595ded20953287e2"><div class="ttname"><a href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6aa9d4777883f8c2a1595ded20953287e2">DCT_II</a></div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00094">avfft.h:94</a></div></div>
<div class="ttc" id="group__lavc__fft_html_ga11f6dd46c458176ef8440c7a15bea7d0"><div class="ttname"><a href="group__lavc__fft.html#ga11f6dd46c458176ef8440c7a15bea7d0">av_dct_calc</a></div><div class="ttdeci">void av_dct_calc(DCTContext *s, FFTSample *data)</div></div>
<div class="ttc" id="group__lavc__fft_html_gac59dbae80d532741eb8af797b3756eae"><div class="ttname"><a href="group__lavc__fft.html#gac59dbae80d532741eb8af797b3756eae">av_mdct_calc</a></div><div class="ttdeci">void av_mdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input)</div></div>
<div class="ttc" id="group__lavc__fft_html_gaac01e094370275491c7cbc580de0fe24"><div class="ttname"><a href="group__lavc__fft.html#gaac01e094370275491c7cbc580de0fe24">FFTContext</a></div><div class="ttdeci">struct FFTContext FFTContext</div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00041">avfft.h:41</a></div></div>
<div class="ttc" id="group__lavc__fft_html_ggaeeabd062332b246d19bed36e041d2df6a6b14deec67dfefcbf3d873a7e55f9358"><div class="ttname"><a href="group__lavc__fft.html#ggaeeabd062332b246d19bed36e041d2df6a6b14deec67dfefcbf3d873a7e55f9358">DCT_I</a></div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00096">avfft.h:96</a></div></div>
<div class="ttc" id="group__lavc__fft_html_ga4fe79338f98704178512503f87a4af4c"><div class="ttname"><a href="group__lavc__fft.html#ga4fe79338f98704178512503f87a4af4c">av_fft_calc</a></div><div class="ttdeci">void av_fft_calc(FFTContext *s, FFTComplex *z)</div><div class="ttdoc">Do a complex FFT with the parameters defined in av_fft_init(). </div></div>
<div class="ttc" id="group__lavc__fft_html_gad6a19df0e8cfc4d67a325e4f91fd9cd9"><div class="ttname"><a href="group__lavc__fft.html#gad6a19df0e8cfc4d67a325e4f91fd9cd9">RDFTContext</a></div><div class="ttdeci">struct RDFTContext RDFTContext</div><div class="ttdef"><b>Definition:</b> <a href="avfft_8h_source.html#l00078">avfft.h:78</a></div></div>
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