FFmpeg  1.2.4
avfft.h
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #ifndef AVCODEC_AVFFT_H
20 #define AVCODEC_AVFFT_H
21 
35 typedef float FFTSample;
36 
37 typedef struct FFTComplex {
38  FFTSample re, im;
39 } FFTComplex;
40 
41 typedef struct FFTContext FFTContext;
42 
49 
54 
59 void av_fft_calc(FFTContext *s, FFTComplex *z);
60 
61 void av_fft_end(FFTContext *s);
62 
63 FFTContext *av_mdct_init(int nbits, int inverse, double scale);
64 void av_imdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input);
65 void av_imdct_half(FFTContext *s, FFTSample *output, const FFTSample *input);
66 void av_mdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input);
67 void av_mdct_end(FFTContext *s);
68 
69 /* Real Discrete Fourier Transform */
70 
76 };
77 
78 typedef struct RDFTContext RDFTContext;
79 
87 void av_rdft_end(RDFTContext *s);
88 
89 /* Discrete Cosine Transform */
90 
91 typedef struct DCTContext DCTContext;
92 
94  DCT_II = 0,
98 };
99 
110 void av_dct_end (DCTContext *s);
111 
116 #endif /* AVCODEC_AVFFT_H */