Alexandre Savard | 0a32ed7 | 2012-08-07 19:26:46 -0400 | [diff] [blame] | 1 | /* Copyright (C) 2005 Jean-Marc Valin |
| 2 | File: fftwrap.h |
| 3 | |
| 4 | Wrapper for various FFTs |
| 5 | |
| 6 | Redistribution and use in source and binary forms, with or without |
| 7 | modification, are permitted provided that the following conditions |
| 8 | are met: |
| 9 | |
| 10 | - Redistributions of source code must retain the above copyright |
| 11 | notice, this list of conditions and the following disclaimer. |
| 12 | |
| 13 | - Redistributions in binary form must reproduce the above copyright |
| 14 | notice, this list of conditions and the following disclaimer in the |
| 15 | documentation and/or other materials provided with the distribution. |
| 16 | |
| 17 | - Neither the name of the Xiph.org Foundation nor the names of its |
| 18 | contributors may be used to endorse or promote products derived from |
| 19 | this software without specific prior written permission. |
| 20 | |
| 21 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 22 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 23 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 24 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR |
| 25 | CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 26 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 27 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 28 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 29 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 30 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 31 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 32 | |
| 33 | */ |
| 34 | |
| 35 | #ifndef FFTWRAP_H |
| 36 | #define FFTWRAP_H |
| 37 | |
| 38 | #include "arch.h" |
| 39 | |
| 40 | /** Compute tables for an FFT */ |
| 41 | void *spx_fft_init(int size); |
| 42 | |
| 43 | /** Destroy tables for an FFT */ |
| 44 | void spx_fft_destroy(void *table); |
| 45 | |
| 46 | /** Forward (real to half-complex) transform */ |
| 47 | void spx_fft(void *table, spx_word16_t *in, spx_word16_t *out); |
| 48 | |
| 49 | /** Backward (half-complex to real) transform */ |
| 50 | void spx_ifft(void *table, spx_word16_t *in, spx_word16_t *out); |
| 51 | |
| 52 | /** Forward (real to half-complex) transform of float data */ |
| 53 | void spx_fft_float(void *table, float *in, float *out); |
| 54 | |
| 55 | /** Backward (half-complex to real) transform of float data */ |
| 56 | void spx_ifft_float(void *table, float *in, float *out); |
| 57 | |
| 58 | #endif |