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Diffstat (limited to 'drivers/speex/smallft.h')
| -rw-r--r-- | drivers/speex/smallft.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/speex/smallft.h b/drivers/speex/smallft.h new file mode 100644 index 0000000000..446e2f65b1 --- /dev/null +++ b/drivers/speex/smallft.h @@ -0,0 +1,46 @@ +/******************************************************************** + * * + * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * + * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * + * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * + * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * + * * + * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 * + * by the XIPHOPHORUS Company http://www.xiph.org/ * + * * + ******************************************************************** + + function: fft transform + last mod: $Id: smallft.h,v 1.3 2003/09/16 18:35:45 jm Exp $ + + ********************************************************************/ +/** + @file smallft.h + @brief Discrete Rotational Fourier Transform (DRFT) +*/ + +#ifndef _V_SMFT_H_ +#define _V_SMFT_H_ + + +#ifdef __cplusplus +extern "C" { +#endif + +/** Discrete Rotational Fourier Transform lookup */ +struct drft_lookup{ + int n; + float *trigcache; + int *splitcache; +}; + +extern void spx_drft_forward(struct drft_lookup *l,float *data); +extern void spx_drft_backward(struct drft_lookup *l,float *data); +extern void spx_drft_init(struct drft_lookup *l,int n); +extern void spx_drft_clear(struct drft_lookup *l); + +#ifdef __cplusplus +} +#endif + +#endif |