/usr/include/SuperCollider/common/SC_fftlib.h is in supercollider-dev 1:3.8.0~repack-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 | /*
SC_fftlib.h
An interface to abstract over different FFT libraries, for SuperCollider 3.
Copyright (c) 2008 Dan Stowell. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _SC_fftlib_
#define _SC_fftlib_
#include <string.h>
// These specify the min & max FFT sizes expected (used when creating windows, also allocating some other arrays).
#define SC_FFT_MINSIZE 8
#define SC_FFT_LOG2_MINSIZE 3
#define SC_FFT_MAXSIZE 32768
#define SC_FFT_LOG2_MAXSIZE 15
// Note that things like *fftWindow actually allow for other sizes, to be created on user request.
#define SC_FFT_ABSOLUTE_MAXSIZE 262144
#define SC_FFT_LOG2_ABSOLUTE_MAXSIZE 18
#define SC_FFT_LOG2_ABSOLUTE_MAXSIZE_PLUS1 19
struct scfft;
class SCFFT_Allocator
{
public:
virtual void* alloc(size_t size) = 0;
virtual void free(void* ptr) = 0;
};
enum SCFFT_Direction
{
kForward = 1,
kBackward = 0
};
// These values are referred to from SC lang as well as in the following code - do not rearrange!
enum SCFFT_WindowFunction
{
kRectWindow = -1,
kSineWindow = 0,
kHannWindow = 1
};
////////////////////////////////////////////////////////////////////////////////////////////////////
// Functions
// To initialise a specific FFT, ensure your input and output buffers exist. Internal data structures
// will be allocated using the alloc object,
// Both "fullsize" and "winsize" should be powers of two (this is not checked internally).
scfft * scfft_create(size_t fullsize, size_t winsize, SCFFT_WindowFunction wintype,
float *indata, float *outdata, SCFFT_Direction forward, SCFFT_Allocator & alloc);
// These two will take data from indata, use trbuf to process it, and put their results in outdata.
void scfft_dofft(scfft *f);
void scfft_doifft(scfft *f);
// destroy any resources held internally.
void scfft_destroy(scfft *f, SCFFT_Allocator & alloc);
#endif
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