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| author | Nedeljko Babic <nbabic@mips.com> | 2013-06-03 16:11:12 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2013-08-04 14:01:41 +0200 |
| commit | 18d7074b4e5a1112cfa6a53dde0faa25d2bd0b15 (patch) | |
| tree | 0d23cbed3eb59d91ba5c734a7222a6ae02c72cba /libavcodec/fft.h | |
| parent | 27cc3e72f8502d6239dcd0f1dd3fe73f1c85355d (diff) | |
| download | ffmpeg-18d7074b4e5a1112cfa6a53dde0faa25d2bd0b15.tar.gz | |
libavcodec: Implementation of 32 bit fixed point FFT
Iterative implementation of 32 bit fixed point split-radix FFT.
Max FFT that can be calculated currently is 2^12.
Signed-off-by: Nedeljko Babic <nbabic@mips.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/fft.h')
| -rw-r--r-- | libavcodec/fft.h | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/libavcodec/fft.h b/libavcodec/fft.h index 910e143f5a..217090cf2a 100644 --- a/libavcodec/fft.h +++ b/libavcodec/fft.h @@ -26,6 +26,10 @@ #define CONFIG_FFT_FLOAT 1 #endif +#ifndef CONFIG_FFT_FIXED_32 +#define CONFIG_FFT_FIXED_32 0 +#endif + #include <stdint.h> #include "config.h" #include "libavutil/mem.h" @@ -40,15 +44,26 @@ typedef float FFTDouble; #else +#if CONFIG_FFT_FIXED_32 + +#define Q31(x) (int)((x)*2147483648.0 + 0.5) +#define FFT_NAME(x) x ## _fixed_32 + +typedef int32_t FFTSample; + +#else /* CONFIG_FFT_FIXED_32 */ + #define FFT_NAME(x) x ## _fixed typedef int16_t FFTSample; -typedef int FFTDouble; + +#endif /* CONFIG_FFT_FIXED_32 */ typedef struct FFTComplex { - int16_t re, im; + FFTSample re, im; } FFTComplex; +typedef int FFTDouble; typedef struct FFTContext FFTContext; #endif /* CONFIG_FFT_FLOAT */ |