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