ComposerDesktopProject/dev/distort/distorto.c

/*
 * Copyright (c) 1983-2013 Trevor Wishart and Composers Desktop Project Ltd
 * http://www.trevorwishart.co.uk
 * http://www.composersdesktop.com
 *
 This file is part of the CDP System.

 The CDP System 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.

 The CDP System 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 the CDP System; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 02111-1307 USA
 *
 */



/* floatsam version */
#include <stdio.h>
#include <stdlib.h>
#include <structures.h>
#include <tkglobals.h>
#include <globcon.h>
#include <modeno.h>
#include <arrays.h>
#include <distort.h>
#include <cdpmain.h>
#include <stdlib.h>
#include <sfsys.h>
#include <osbind.h>

static int advance_func(int *current_pos_in_buf,dataptr dz);

/**************************** DISTORT_OMT ******************************
 *
 * keep 'keep' cycles, omit 'omit' cycles.
 */

int distort_omt(int *current_pos_in_buf,int inital_phase,dataptr dz)
{
    int exit_status;
    register int n;
    int i = *current_pos_in_buf;
    float *b = dz->sampbuf[0];
    int keep = dz->iparam[DISTORTO_KEEP] - dz->iparam[DISTORTO_OMIT];
    switch(inital_phase) {
    case(1):
        for(n=0;n<keep;n++) {
            while(b[i]>=0.0) {
                if((exit_status = advance_func(&i,dz))!=CONTINUE)
                    return(exit_status);
            }
            while(b[i]<=0.0) {
                if((exit_status = advance_func(&i,dz))!=CONTINUE)
                    return(exit_status);
            }
        }
        for(n=0;n<dz->iparam[DISTORTO_OMIT];n++) {
            while(b[i]>=0.0) {
                b[i] = 0;
                if((exit_status = advance_func(&i,dz))!=CONTINUE)
                    return(exit_status);
            }
            while(b[i]<=0.0) {
                b[i] = 0.0;
                if((exit_status = advance_func(&i,dz))!=CONTINUE)
                    return(exit_status);
            }
        }
        break;
    case(-1):
        for(n=0;n<keep;n++) {
            while(b[i]<=0.0) {
                if((exit_status = advance_func(&i,dz))!=CONTINUE)
                    return(exit_status);
            }
            while(b[i]>=0.0) {
                if((exit_status = advance_func(&i,dz))!=CONTINUE)
                    return(exit_status);
            }
        }
        for(n=0;n<dz->iparam[DISTORTO_OMIT];n++) {
            while(b[i]<=00) {
                b[i] = 0.0;
                if((exit_status = advance_func(&i,dz))!=CONTINUE)
                    return(exit_status);
            }
            while(b[i]>=0.0) {
                b[i] = 0.0;
                if((exit_status = advance_func(&i,dz))!=CONTINUE)
                    return(exit_status);
            }
        }
        break;
    }
    *current_pos_in_buf = i;
    return(CONTINUE);
}

/******************************** ADVANCE_FUNC ***************************/

int advance_func(int *current_pos_in_buf,dataptr dz)
{
    int exit_status;
    if(++(*current_pos_in_buf) >= dz->ssampsread) {
        if(dz->ssampsread > 0) {
            if((exit_status = write_samps(dz->sampbuf[0],dz->ssampsread,dz))<0)
                return(exit_status);
        }
        if(dz->samps_left <= 0)
            return(FINISHED);
        if((exit_status = read_samps(dz->sampbuf[0],dz))<0)
            return(exit_status);
        *current_pos_in_buf = 0;
    }
    return(CONTINUE);
}