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84 lines
3.4 KiB
84 lines
3.4 KiB
/*
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* $Id$
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*
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* Copyright (C) 2002-2003 Fhg Fokus
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*
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* This file is part of sems, a free SIP media server.
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*
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* sems is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* For a license to use the sems software under conditions
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* other than those described here, or to purchase support for this
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* software, please contact iptel.org by e-mail at the following addresses:
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* info@iptel.org
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*
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* sems 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LowcFE_h_
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#define _LowcFE_h_
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typedef float Float;
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#define PITCH_MIN 40 /* minimum allowed pitch, 200 Hz */
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#define PITCH_MAX 120 /* maximum allowed pitch, 66 Hz */
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#define PITCHDIFF (PITCH_MAX - PITCH_MIN)
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#define POVERLAPMAX (PITCH_MAX >> 2) /* maximum pitch OLA window */
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#define HISTORYLEN (PITCH_MAX * 3 + POVERLAPMAX) /* history buff length*/
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#define NDEC 2 /* 2:1 decimation */
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#define CORRLEN 160 /* 20 msec correlation length */
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#define CORRBUFLEN (CORRLEN + PITCH_MAX) /* correlation buffer length */
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#define CORRMINPOWER ((Float)250.) /* minimum power */
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#define EOVERLAPINCR 32 /* end OLA increment per frame,4 ms */
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#define FRAMESZ 80 /* 10 msec at 8 KHz */
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#define ATTENFAC ((Float).2) /* attenu. factor per 10 ms frame */
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#define ATTENINCR (ATTENFAC/FRAMESZ) /* attenuation per sample */
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/** \brief LowcFE erased frame generator for fec (plc) */
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class LowcFE {
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public:
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LowcFE();
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void dofe(short *s); /* synthesize speech for erasure */
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void addtohistory(short *s); /* add a good frame to history buf */
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protected:
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int erasecnt; /* consecutive erased frames */
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int poverlap; /* overlap based on pitch */
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int poffset; /* offset into pitch period */
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int pitch; /* pitch estimate */
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int pitchblen; /* current pitch buffer length */
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Float *pitchbufend; /* end of pitch buffer */
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Float *pitchbufstart; /* start of pitch buffer */
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Float pitchbuf[HISTORYLEN]; /* buffer for cycles of speech */
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Float lastq[POVERLAPMAX]; /* saved last quarter wavelength */
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short history[HISTORYLEN]; /* history buffer */
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void scalespeech(short *out);
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void getfespeech(short *out, int sz);
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void savespeech(short *s);
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int findpitch();
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void overlapadd(Float *l, Float *r, Float *o, int cnt);
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void overlapadd(short *l, short *r, short *o, int cnt);
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void overlapaddatend(short *s, short *f, int cnt);
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void convertsf(short *f, Float *t, int cnt);
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void convertfs(Float *f, short *t, int cnt);
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void copyf(Float *f, Float *t, int cnt);
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void copys(short *f, short *t, int cnt);
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void zeros(short *s, int cnt);
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};
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#endif
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