/*
 * 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 <sfsys.h>
#include <osbind.h>

static int do_shuffle(float *inbuf,int *obufpos,dataptr dz);
static int do_shuffle_crosbuf(int current_buf,int *obufpos,int cycleno_in_group_at_bufcros,dataptr dz);

/**************************** DISTORT_SHUF ******************************
 *
 * Distort file by shuffling GROUPS of cycles.
 */

int distort_shuf
(int *current_buf,int initial_phase,int *obufpos,int *current_pos_in_buf,int *cnt,dataptr dz)
{
    int exit_status;
    register int i = *current_pos_in_buf;
    register int n;
    int cycleno_in_group_at_bufcros = -1;
    int cyclecnt = dz->iparam[DISTORTS_CYCLECNT] * dz->iparam[DISTORTS_DMNCNT];
    float *inbuf  = dz->sampbuf[*current_buf];
    for(n=0;n<cyclecnt;n++) {
        dz->lparray[DISTORTS_STARTCYC][n] = i;
        switch(initial_phase) {
        case(1):
            while(inbuf[i]>=0.0) {
                if(++i >= dz->ssampsread) {
                    if((exit_status = change_buff(&inbuf,&cycleno_in_group_at_bufcros,current_buf,dz))!=CONTINUE)
                        return(exit_status);
                    cycleno_in_group_at_bufcros = n;
                    i = 0;
                }
            }
            while(inbuf[i]<=0) {
                if(++i >= dz->ssampsread) {
                    if((exit_status = change_buff(&inbuf,&cycleno_in_group_at_bufcros,current_buf,dz))!=CONTINUE)
                        return(exit_status);
                    cycleno_in_group_at_bufcros = n;
                    i = 0;
                }
            }
            break;
        case(-1):
            while(inbuf[i]<=0) {
                if(++i >= dz->ssampsread) {
                    if((exit_status = change_buff(&inbuf,&cycleno_in_group_at_bufcros,current_buf,dz))!=CONTINUE)
                        return(exit_status);
                    cycleno_in_group_at_bufcros = n;
                    i = 0;
                }
            }
            while(inbuf[i]>=0) {
                if(++i >= dz->ssampsread) {
                    if((exit_status = change_buff(&inbuf,&cycleno_in_group_at_bufcros,current_buf,dz))!=CONTINUE)
                        return(exit_status);
                    cycleno_in_group_at_bufcros = n;
                    i = 0;
                }
            }
            break;
        }
    }
    dz->lparray[DISTORTS_STARTCYC][n] = i;
    if(cycleno_in_group_at_bufcros >= 0)
        exit_status = do_shuffle_crosbuf(*current_buf,obufpos,cycleno_in_group_at_bufcros,dz);
    else
        exit_status = do_shuffle(inbuf,obufpos,dz);
    if(exit_status<0)
        return(exit_status);
    *current_pos_in_buf = i;
    (*cnt)++;
    return(CONTINUE);
}

/*************************** DO_SHUFFLE **************************/

int do_shuffle(float *inbuf,int *obufpos,dataptr dz)
{
    /*RWD need this! */
    int exit_status;

    float *outbuf = dz->sampbuf[2];
    register int outbufpos = *obufpos, k, m, n;
    int  grpbase, thiscycle;
    for(n=0;n<dz->iparam[DISTORTS_IMGCNT];n++) {
        grpbase = dz->iparray[DISTORTS_MAP][n] * dz->iparam[DISTORTS_CYCLECNT];
        for(m=0;m<dz->iparam[DISTORTS_CYCLECNT];m++) {
            thiscycle = grpbase + m;
            k = dz->lparray[DISTORTS_STARTCYC][thiscycle];
            while(k < dz->lparray[DISTORTS_STARTCYC][thiscycle+1]) {
                outbuf[outbufpos] = inbuf[k++];
                if(++outbufpos >= dz->buflen) {
                    /* RWD 4:2002 added exit_status check */
                    exit_status = write_samps(outbuf,dz->buflen,dz);

                    if(exit_status < 0)
                        return exit_status;

                    outbufpos = 0;
                }
            }
        }
    }
    *obufpos = outbufpos;
    return(FINISHED);
}

/********************** DO_SHUFFLE_CROSBUF *************************/

int do_shuffle_crosbuf(int current_buf,int *obufpos,int cycleno_in_group_at_bufcros,dataptr dz)
{
    int exit_status;        /*RWD 4:2002 */
    float *outbuf = dz->sampbuf[2];
    register int k, m, n, outbufpos = *obufpos;
    int  grpbase, thiscycle;
    float *inbuf;
    for(n=0;n<dz->iparam[DISTORTS_IMGCNT];n++) {
        grpbase = dz->iparray[DISTORTS_MAP][n] * dz->iparam[DISTORTS_CYCLECNT];
        for(m=0;m<dz->iparam[DISTORTS_CYCLECNT];m++) {
            thiscycle = grpbase + m;
            k = dz->lparray[DISTORTS_STARTCYC][thiscycle];
            if(thiscycle == cycleno_in_group_at_bufcros) {
                inbuf= dz->sampbuf[!current_buf];
                while(k < dz->buflen) {
                    outbuf[outbufpos] = inbuf[k++];
                    if(++outbufpos >= dz->buflen) {
                        /* RWD 4:2002 added error check */
                        exit_status = write_samps(outbuf,dz->buflen,dz);
                        if(exit_status < 0)
                            return exit_status;
                        outbufpos = 0;
                    }
                }
                inbuf = dz->sampbuf[current_buf];
                k = 0;
            } else {
                if(thiscycle < cycleno_in_group_at_bufcros)
                    inbuf = dz->sampbuf[!current_buf];
                else
                    inbuf = dz->sampbuf[current_buf];
            }
            while(k < dz->lparray[DISTORTS_STARTCYC][thiscycle+1]) {
                outbuf[outbufpos] = inbuf[k++];
                if(++outbufpos >= dz->buflen) {
                    /*RWD as above */
                    exit_status = write_samps(outbuf,dz->buflen,dz);
                    if(exit_status < 0)
                        return exit_status;

                    outbufpos = 0;
                }
            }
        }
    }
    *obufpos = outbufpos;
    return(FINISHED);
}
