/*      libSoX DVMS format module (implementation in cvsd.c) * *      Copyright (C) 1996-2007 Thomas Sailer and SoX Contributors *      Thomas Sailer (sailer@ife.ee.ethz.ch) (HB9JNX/AE4WA) *      Swiss Federal Institute of Technology, Electronics Lab * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or (at * your option) any later version. * * This library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser * General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library; if not, write to the Free Software Foundation, * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA * */#include "sox_i.h" #define CVSD_ENC_FILTERLEN 16  /* PCM sampling rate */#define CVSD_DEC_FILTERLEN 48  /* CVSD sampling rate */ typedef struct {  struct {    unsigned overload;    float mla_int;    float mla_tc0;    float mla_tc1;    unsigned phase;    unsigned phase_inc;    float v_min, v_max;  } com;  union {    struct {      /* mirror circular buffer */      float output_filter[CVSD_DEC_FILTERLEN*2];      unsigned offset; /* into output_filter; always in first half */    } dec;    struct {      float recon_int;      /* mirror circular buffer */      float input_filter[CVSD_ENC_FILTERLEN*2];      unsigned offset; /* into input_filter; always in first half */    } enc;  } c;  struct {    unsigned char shreg;    unsigned mask;    unsigned cnt;  } bit;  unsigned bytes_written;  unsigned cvsd_rate;} cvsd_priv_t; int lsx_cvsdstartread(sox_format_t * ft);int lsx_cvsdstartwrite(sox_format_t * ft);size_t lsx_cvsdread(sox_format_t * ft, sox_sample_t *buf, size_t nsamp);size_t lsx_cvsdwrite(sox_format_t * ft, const sox_sample_t *buf, size_t nsamp);int lsx_cvsdstopread(sox_format_t * ft);int lsx_cvsdstopwrite(sox_format_t * ft); int lsx_dvmsstartread(sox_format_t * ft);int lsx_dvmsstartwrite(sox_format_t * ft);int lsx_dvmsstopwrite(sox_format_t * ft);