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1 1.3.0 2012-07-18 2 removed non-standard malloc.h from kiss_fft.h 3 4 moved -lm to end of link line 5 6 checked various return values 7 8 converted python Numeric code to NumPy 9 10 fixed test of int32_t on 64 bit OS 11 12 added padding in a couple of places to allow SIMD alignment of structs 13 14 1.2.9 2010-05-27 15 threadsafe ( including OpenMP ) 16 17 first edition of kissfft.hh the C++ template fft engine 18 19 1.2.8 20 Changed memory.h to string.h -- apparently more standard 21 22 Added openmp extensions. This can have fairly linear speedups for larger FFT sizes. 23 24 1.2.7 25 Shrank the real-fft memory footprint. Thanks to Galen Seitz. 26 27 1.2.6 (Nov 14, 2006) The "thanks to GenArts" release. 28 Added multi-dimensional real-optimized FFT, see tools/kiss_fftndr 29 Thanks go to GenArts, Inc. for sponsoring the development. 30 31 1.2.5 (June 27, 2006) The "release for no good reason" release. 32 Changed some harmless code to make some compilers' warnings go away. 33 Added some more digits to pi -- why not. 34 Added kiss_fft_next_fast_size() function to help people decide how much to pad. 35 Changed multidimensional test from 8 dimensions to only 3 to avoid testing 36 problems with fixed point (sorry Buckaroo Banzai). 37 38 1.2.4 (Oct 27, 2005) The "oops, inverse fixed point real fft was borked" release. 39 Fixed scaling bug for inverse fixed point real fft -- also fixed test code that should've been failing. 40 Thanks to Jean-Marc Valin for bug report. 41 42 Use sys/types.h for more portable types than short,int,long => int16_t,int32_t,int64_t 43 If your system does not have these, you may need to define them -- but at least it breaks in a 44 loud and easily fixable way -- unlike silently using the wrong size type. 45 46 Hopefully tools/psdpng.c is fixed -- thanks to Steve Kellog for pointing out the weirdness. 47 48 1.2.3 (June 25, 2005) The "you want to use WHAT as a sample" release. 49 Added ability to use 32 bit fixed point samples -- requires a 64 bit intermediate result, a la 'long long' 50 51 Added ability to do 4 FFTs in parallel by using SSE SIMD instructions. This is accomplished by 52 using the __m128 (vector of 4 floats) as kiss_fft_scalar. Define USE_SIMD to use this. 53 54 I know, I know ... this is drifting a bit from the "kiss" principle, but the speed advantages 55 make it worth it for some. Also recent gcc makes it SOO easy to use vectors of 4 floats like a POD type. 56 57 1.2.2 (May 6, 2005) The Matthew release 58 Replaced fixed point division with multiply&shift. Thanks to Jean-Marc Valin for 59 discussions regarding. Considerable speedup for fixed-point. 60 61 Corrected overflow protection in real fft routines when using fixed point. 62 Finder's Credit goes to Robert Oschler of robodance for pointing me at the bug. 63 This also led to the CHECK_OVERFLOW_OP macro. 64 65 1.2.1 (April 4, 2004) 66 compiles cleanly with just about every -W warning flag under the sun 67 68 reorganized kiss_fft_state so it could be read-only/const. This may be useful for embedded systems 69 that are willing to predeclare twiddle factors, factorization. 70 71 Fixed C_MUL,S_MUL on 16-bit platforms. 72 73 tmpbuf will only be allocated if input & output buffers are same 74 scratchbuf will only be allocated for ffts that are not multiples of 2,3,5 75 76 NOTE: The tmpbuf,scratchbuf changes may require synchronization code for multi-threaded apps. 77 78 79 1.2 (Feb 23, 2004) 80 interface change -- cfg object is forward declaration of struct instead of void* 81 This maintains type saftey and lets the compiler warn/error about stupid mistakes. 82 (prompted by suggestion from Erik de Castro Lopo) 83 84 small speed improvements 85 86 added psdpng.c -- sample utility that will create png spectrum "waterfalls" from an input file 87 ( not terribly useful yet) 88 89 1.1.1 (Feb 1, 2004 ) 90 minor bug fix -- only affects odd rank, in-place, multi-dimensional FFTs 91 92 1.1 : (Jan 30,2004) 93 split sample_code/ into test/ and tools/ 94 95 Removed 2-D fft and added N-D fft (arbitrary) 96 97 modified fftutil.c to allow multi-d FFTs 98 99 Modified core fft routine to allow an input stride via kiss_fft_stride() 100 (eased support of multi-D ffts) 101 102 Added fast convolution filtering (FIR filtering using overlap-scrap method, with tail scrap) 103 104 Add kfc.[ch]: the KISS FFT Cache. It takes care of allocs for you ( suggested by Oscar Lesta ). 105 106 1.0.1 (Dec 15, 2003) 107 fixed bug that occurred when nfft==1. Thanks to Steven Johnson. 108 109 1.0 : (Dec 14, 2003) 110 changed kiss_fft function from using a single buffer, to two buffers. 111 If the same buffer pointer is supplied for both in and out, kiss will 112 manage the buffer copies. 113 114 added kiss_fft2d and kiss_fftr as separate source files (declarations in kiss_fft.h ) 115 116 0.4 :(Nov 4,2003) optimized for radix 2,3,4,5 117 118 0.3 :(Oct 28, 2003) woops, version 2 didn't actually factor out any radices other than 2. 119 Thanks to Steven Johnson for finding this one. 120 121 0.2 :(Oct 27, 2003) added mixed radix, only radix 2,4 optimized versions 122 123 0.1 :(May 19 2003) initial release, radix 2 only