mirror of
https://github.com/mborgerding/kissfft.git
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76 lines
3.1 KiB
Plaintext
76 lines
3.1 KiB
Plaintext
1.2.3 (June 25, 2005) The "you want to use WHAT as a sample" release.
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Added ability to use 32 bit fixed point samples -- requires a 64 bit intermediate result, a la 'long long'
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Added ability to do 4 FFTs in parallel by using SSE SIMD instructions. This is accomplished by
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using the __m128 (vector of 4 floats) as kiss_fft_scalar. Define USE_SIMD to use this.
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I know, I know ... this is drifting a bit from the "kiss" principle, but the speed advantages
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make it worth it for some. Also recent gcc makes it SOO easy to use vectors of 4 floats as a POD type.
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1.2.2 (May 6, 2005) The Matthew release
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Replaced fixed point division with multiply&shift. Thanks to Jean-Marc Valin for
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discussions regarding. Considerable speedup.
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Corrected overflow protection in real fft routines when using fixed point.
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Finder's Credit goes to Robert Oschler of robodance for pointing me at the bug.
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This also led to the CHECK_OVERFLOW_OP macro.
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1.2.1 (April 4, 2004)
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compiles cleanly with just about every -W warning flag under the sun
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reorganized kiss_fft_state so it could be read-only/const. This may be useful for embedded systems
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that are willing to predeclare twiddle factors, factorization.
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Fixed C_MUL,S_MUL on 16-bit platforms.
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tmpbuf will only be allocated if input & output buffers are same
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scratchbuf will only be allocated for ffts that are not multiples of 2,3,5
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NOTE: The tmpbuf,scratchbuf changes may require synchronization code for multi-threaded apps.
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1.2 (Feb 23, 2004)
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interface change -- cfg object is forward declaration of struct instead of void*
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This maintains type saftey and lets the compiler warn/error about stupid mistakes.
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(prompted by suggestion from Erik de Castro Lopo)
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small speed improvements
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added psdpng.c -- sample utility that will create png spectrum "waterfalls" from an input file
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( not terribly useful yet)
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1.1.1 (Feb 1, 2004 )
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minor bug fix -- only affects odd rank, in-place, multi-dimensional FFTs
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1.1 : (Jan 30,2004)
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split sample_code/ into test/ and tools/
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Removed 2-D fft and added N-D fft (arbitrary)
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modified fftutil.c to allow multi-d FFTs
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Modified core fft routine to allow an input stride via kiss_fft_stride()
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(eased support of multi-D ffts)
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Added fast convolution filtering (FIR filtering using overlap-scrap method, with tail scrap)
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Add kfc.[ch]: the KISS FFT Cache. It takes care of allocs for you ( suggested by Oscar Lesta ).
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1.0.1 (Dec 15, 2003)
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fixed bug that occurred when nfft==1
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1.0 : (Dec 14, 2003)
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changed kiss_fft function from using a single buffer, to two buffers.
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If the same buffer pointer is supplied for both in and out, kiss will
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manage the buffer copies.
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added kiss_fft2d and kiss_fftr as separate source files (declarations in kiss_fft.h )
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0.4 :(Nov 4,2003) optimized for radix 2,3,4,5
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0.3 :(Oct 28, 2003) woops, version 2 didn't actually factor out any radices other than 2
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0.2 :(Oct 27, 2003) added mixed radix, only radix 2,4 optimized versions
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0.1 :(May 19 2003) initial release, radix 2 only
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