108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* lpc10_encdecs.h - LPC10 low bit rate speech codec.
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*
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* Written by Steve Underwood <steveu@coppice.org>
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*
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* Copyright (C) 2006 Steve Underwood
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 2.1,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#define LPC10_ORDER 10
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#define LPC10_MAX_PITCH 20
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#define LPC10_MIN_PITCH 156
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#if !defined(min)
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#define min(a,b) ((a) <= (b) ? (a) : (b))
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#endif
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#if !defined(max)
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#define max(a,b) ((a) >= (b) ? (a) : (b))
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#endif
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void lpc10_placea(int32_t *ipitch,
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int32_t voibuf[4][2],
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int32_t *obound,
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int32_t af,
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int32_t vwin[3][2],
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int32_t awin[3][2],
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int32_t ewin[3][2],
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int32_t lframe,
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int32_t maxwin);
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void lpc10_placev(int32_t *osbuf,
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int32_t *osptr,
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int32_t oslen,
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int32_t *obound,
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int32_t vwin[3][2],
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int32_t af,
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int32_t lframe,
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int32_t minwin,
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int32_t maxwin,
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int32_t dvwinl,
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int32_t dvwinh);
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void lpc10_voicing(lpc10_encode_state_t *st,
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int32_t *vwin,
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float *inbuf,
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float *lpbuf,
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const int32_t buflim[],
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int32_t half,
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float *minamd,
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float *maxamd,
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int32_t *mintau,
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float *ivrc,
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int32_t *obound);
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void lpc10_analyse(lpc10_encode_state_t *st, float *speech, int32_t *voice, int32_t *pitch, float *rms, float rc[]);
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static __inline__ int32_t pow_ii(int32_t x, int32_t n)
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{
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int32_t pow;
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uint32_t u;
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if (n <= 0)
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{
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if (n == 0 || x == 1)
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return 1;
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if (x != -1)
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return (x != 0) ? 1/x : 0;
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n = -n;
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}
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u = n;
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for (pow = 1; ; )
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{
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if ((u & 1))
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pow *= x;
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if ((u >>= 1) == 0)
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break;
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x *= x;
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}
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return pow;
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}
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/*- End of function --------------------------------------------------------*/
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static __inline__ float r_sign(float a, float b)
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{
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float x;
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x = fabsf(a);
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return (b >= 0.0f) ? x : -x;
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}
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/*- End of function --------------------------------------------------------*/
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/*- End of file ------------------------------------------------------------*/
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