113 lines
4.7 KiB
C
113 lines
4.7 KiB
C
/* Copyright (c) 2007-2008 CSIRO
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Copyright (c) 2007-2008 Xiph.Org Foundation
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Written by Jean-Marc Valin */
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/*
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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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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 COPYRIGHT OWNER
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OR 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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/* This is a simple MDCT implementation that uses a N/4 complex FFT
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to do most of the work. It should be relatively straightforward to
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plug in pretty much and FFT here.
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This replaces the Vorbis FFT (and uses the exact same API), which
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was a bit too messy and that was ending up duplicating code
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(might as well use the same FFT everywhere).
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The algorithm is similar to (and inspired from) Fabrice Bellard's
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MDCT implementation in FFMPEG, but has differences in signs, ordering
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and scaling in many places.
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*/
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#ifndef MDCT_H
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#define MDCT_H
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#include "opus_defines.h"
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#include "kiss_fft.h"
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#include "arch.h"
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typedef struct {
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int n;
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int maxshift;
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const kiss_fft_state *kfft[4];
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const kiss_twiddle_scalar * OPUS_RESTRICT trig;
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} mdct_lookup;
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#if defined(HAVE_ARM_NE10)
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#include "arm/mdct_arm.h"
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#endif
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int clt_mdct_init(mdct_lookup *l,int N, int maxshift, int arch);
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void clt_mdct_clear(mdct_lookup *l, int arch);
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/** Compute a forward MDCT and scale by 4/N, trashes the input array */
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void clt_mdct_forward_c(const mdct_lookup *l, kiss_fft_scalar *in,
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kiss_fft_scalar * OPUS_RESTRICT out,
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const opus_val16 *window, int overlap,
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int shift, int stride, int arch);
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/** Compute a backward MDCT (no scaling) and performs weighted overlap-add
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(scales implicitly by 1/2) */
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void clt_mdct_backward_c(const mdct_lookup *l, kiss_fft_scalar *in,
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kiss_fft_scalar * OPUS_RESTRICT out,
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const opus_val16 * OPUS_RESTRICT window,
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int overlap, int shift, int stride, int arch);
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#if !defined(OVERRIDE_OPUS_MDCT)
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/* Is run-time CPU detection enabled on this platform? */
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#if defined(OPUS_HAVE_RTCD) && defined(HAVE_ARM_NE10)
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extern void (*const CLT_MDCT_FORWARD_IMPL[OPUS_ARCHMASK+1])(
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const mdct_lookup *l, kiss_fft_scalar *in,
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kiss_fft_scalar * OPUS_RESTRICT out, const opus_val16 *window,
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int overlap, int shift, int stride, int arch);
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#define clt_mdct_forward(_l, _in, _out, _window, _overlap, _shift, _stride, _arch) \
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((*CLT_MDCT_FORWARD_IMPL[(arch)&OPUS_ARCHMASK])(_l, _in, _out, \
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_window, _overlap, _shift, \
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_stride, _arch))
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extern void (*const CLT_MDCT_BACKWARD_IMPL[OPUS_ARCHMASK+1])(
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const mdct_lookup *l, kiss_fft_scalar *in,
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kiss_fft_scalar * OPUS_RESTRICT out, const opus_val16 *window,
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int overlap, int shift, int stride, int arch);
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#define clt_mdct_backward(_l, _in, _out, _window, _overlap, _shift, _stride, _arch) \
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(*CLT_MDCT_BACKWARD_IMPL[(arch)&OPUS_ARCHMASK])(_l, _in, _out, \
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_window, _overlap, _shift, \
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_stride, _arch)
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#else /* if defined(OPUS_HAVE_RTCD) && defined(HAVE_ARM_NE10) */
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#define clt_mdct_forward(_l, _in, _out, _window, _overlap, _shift, _stride, _arch) \
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clt_mdct_forward_c(_l, _in, _out, _window, _overlap, _shift, _stride, _arch)
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#define clt_mdct_backward(_l, _in, _out, _window, _overlap, _shift, _stride, _arch) \
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clt_mdct_backward_c(_l, _in, _out, _window, _overlap, _shift, _stride, _arch)
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#endif /* end if defined(OPUS_HAVE_RTCD) && defined(HAVE_ARM_NE10) && !defined(FIXED_POINT) */
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#endif /* end if !defined(OVERRIDE_OPUS_MDCT) */
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#endif
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