/* libSoX effect: divide   Copyright (c) 2009 robs@users.sourceforge.net * * 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 */ /* This is W.I.P. hence marked SOX_EFF_ALPHA for now. * Needs better handling of when the divisor approaches or is zero; some * sort of interpolation of the output values perhaps. */ #include "sox_i.h"#include <string.h> typedef struct {  sox_sample_t * last;} priv_t; static int start(sox_effect_t * effp){  priv_t * p = (priv_t *)effp->priv;  p->last = lsx_calloc(effp->in_signal.channels, sizeof(*p->last));  return SOX_SUCCESS;} static int flow(sox_effect_t * effp, const sox_sample_t * ibuf,    sox_sample_t * obuf, size_t * isamp, size_t * osamp){  priv_t * p = (priv_t *)effp->priv;  size_t i, len =  min(*isamp, *osamp) / effp->in_signal.channels;  *osamp = *isamp = len * effp->in_signal.channels;   while (len--) {    double divisor = *obuf++ = *ibuf++;    if (divisor) {      double out, mult = 1. / SOX_SAMPLE_TO_FLOAT_64BIT(divisor,);      for (i = 1; i < effp->in_signal.channels; ++i) {        out = *ibuf++ * mult;        p->last[i] = *obuf++ = SOX_ROUND_CLIP_COUNT(out, effp->clips);      }    }    else for (i = 1; i < effp->in_signal.channels; ++i, ++ibuf)      *obuf++ = p->last[i];  }  return SOX_SUCCESS;} static int stop(sox_effect_t * effp){  priv_t * p = (priv_t *)effp->priv;  free(p->last);  return SOX_SUCCESS;} sox_effect_handler_t const * lsx_divide_effect_fn(void){  static sox_effect_handler_t handler = {    "divide", NULL, SOX_EFF_MCHAN | SOX_EFF_GAIN | SOX_EFF_ALPHA,    NULL, start, flow, NULL, stop, NULL, sizeof(priv_t)  };  return &handler;}