forked from Mirrors/freeswitch
59 lines
2.2 KiB
C
59 lines
2.2 KiB
C
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/* Copyright (C) 2005 Jean-Marc Valin
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File: fftwrap.h
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Wrapper for various FFTs
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef FFTWRAP_H
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#define FFTWRAP_H
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#include "misc.h"
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/** Compute tables for an FFT */
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void *spx_fft_init(int size);
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/** Destroy tables for an FFT */
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void spx_fft_destroy(void *table);
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/** Forward (real to half-complex) transform */
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void spx_fft(void *table, spx_word16_t *in, spx_word16_t *out);
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/** Backward (half-complex to real) transform */
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void spx_ifft(void *table, spx_word16_t *in, spx_word16_t *out);
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/** Forward (real to half-complex) transform of float data */
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void spx_fft_float(void *table, float *in, float *out);
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/** Backward (half-complex to real) transform of float data */
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void spx_ifft_float(void *table, float *in, float *out);
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#endif
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