/*
 * 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_cycle_tele(int n,int current_buf,int *obufpos,dataptr dz);
static int      do_cycle_tele_crosbuf(int n,int cycleno_in_group_at_bufcros,int current_buf,int *obufpos,dataptr dz);
static int get_longcycle(int,dataptr);
static int get_meancycle(int,dataptr);
static float    indexed_value(float *b,int k,double ratio,dataptr dz);
static float    indexed_value_at_crosbuf(float *b,int k,double ratio,int current_buf,dataptr dz);

/******************************* DISTORT_TEL ******************************/

int distort_tel(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;
    int n = 0;
    int cycleno_in_group_at_bufcros = -1;
    float *b  = dz->sampbuf[*current_buf];
    switch(initial_phase) {                         /* 4 */
    case(1):
        for(n=0;n<dz->iparam[DISTTEL_CYCLECNT];n++) {           /* 5 */
            dz->lparray[DISTTEL_CYCLEVAL][n] = 0;                   /* 6 */
            dz->lparray[DISTTEL_STARTCYC][n] = i;           /* 7 */
            while(b[i]>=0.0) {              /* 8 */
                /* RWD NB this is counting samples */
                dz->lparray[DISTTEL_CYCLEVAL][n]++;
                if(++i >= dz->ssampsread) {     /* 10 */
                    if((exit_status = change_buff(&b,&cycleno_in_group_at_bufcros,current_buf,dz))!=CONTINUE)
                        return(exit_status);
                    cycleno_in_group_at_bufcros = n;
                    i = 0;
                }
            }
            while(b[i]<=0.0) {              /* 18a */
                dz->lparray[DISTTEL_CYCLEVAL][n]++;
                if(++i >= dz->ssampsread) {
                    if((exit_status = change_buff(&b,&cycleno_in_group_at_bufcros,current_buf,dz))!=CONTINUE)
                        return(exit_status);
                    cycleno_in_group_at_bufcros = n;
                    i = 0;
                }
            }
        }
        break;
    case(-1):                                               /* 18b */
        for(n=0;n<dz->iparam[DISTTEL_CYCLECNT];n++) {
            dz->lparray[DISTTEL_CYCLEVAL][n] = 0;
            dz->lparray[DISTTEL_STARTCYC][n] = i;
            while(b[i]<=0.0) {
                dz->lparray[DISTTEL_CYCLEVAL][n]++;
                if(++i >= dz->ssampsread) {
                    if((exit_status = change_buff(&b,&cycleno_in_group_at_bufcros,current_buf,dz))!=CONTINUE)
                        return(exit_status);
                    cycleno_in_group_at_bufcros = n;
                    i = 0;
                }
            }
            while(b[i]>=0.0) {
                dz->lparray[DISTTEL_CYCLEVAL][n]++;
                if(++i >= dz->ssampsread) {
                    if((exit_status = change_buff(&b,&cycleno_in_group_at_bufcros,current_buf,dz))!=CONTINUE)
                        return(exit_status);
                    cycleno_in_group_at_bufcros = n;
                    i = 0;
                }
            }
        }
        break;
    }
    if(n) {
        if(cycleno_in_group_at_bufcros >= 0) {
            exit_status = do_cycle_tele_crosbuf(n,cycleno_in_group_at_bufcros,*current_buf,obufpos,dz);
        } else {
            exit_status = do_cycle_tele(n,*current_buf,obufpos,dz);
        }
        if(exit_status<0)
            return(exit_status);
    }
    *current_pos_in_buf = i;
    (*cnt)++;
    return(CONTINUE);
}

/*************************** DO_CYCLE_TELE *************************/

int do_cycle_tele(int n,int current_buf,int *obufpos,dataptr dz)
{
    int exit_status;
    float *b = dz->sampbuf[current_buf];
    double ratio;
    int k, j, reflength/*, cyclesum*/;
    float cyclesum;
    /*int*/float average_value;
    if(dz->vflag[IS_DISTTEL_AVG])
        reflength = get_meancycle(n,dz);
    else
        reflength = get_longcycle(n,dz);
    for(j = 0;j < reflength; j++) {
        ratio = (double)j/(double)reflength;
        cyclesum = 0.0;
        k = 0;
        while(k<n)
            cyclesum += indexed_value(b,k++,ratio,dz);
        average_value = (float) /*round*/ ((double)cyclesum/(double)n);
        if((exit_status = output_val(average_value,obufpos,dz))<0)
            return(exit_status);
    }
    return(FINISHED);
}

/*************************** DO_CYCLE_TELE_CROSBUF *************************/

int do_cycle_tele_crosbuf(int n,int cycleno_in_group_at_bufcros,int current_buf,int *obufpos,dataptr dz)
{
    int exit_status;
    float *b;
    double ratio;
    int k, j, reflength /*, cyclesum*/;
    float cyclesum;
    /*int*/float average_value;
    if(dz->vflag[IS_DISTTEL_AVG])
        reflength = get_meancycle(n,dz);
    else
        reflength = get_longcycle(n,dz);
    for(j = 0;j < reflength; j++) {
        ratio = (double)j/(double)reflength;
        cyclesum = 0.0;
        k = 0;
        b = dz->sampbuf[!current_buf];
        while(k < cycleno_in_group_at_bufcros)
            cyclesum += indexed_value(b,k++,ratio,dz);
        cyclesum += indexed_value_at_crosbuf(b,k++,ratio,current_buf,dz);
        b = dz->sampbuf[current_buf];
        while(k<n)
            cyclesum += indexed_value(b,k++,ratio,dz);
        average_value = (float) /*round*/((double)cyclesum/(double)n);
        if((exit_status = output_val(average_value,obufpos,dz))<0)
            return(exit_status);
    }
    return(FINISHED);
}


/***************************** INDEXED_VALUE ***********************/

float indexed_value(float *b,int k,double ratio,dataptr dz)
{
    int index = round((double)(dz->lparray[DISTTEL_CYCLEVAL][k])*ratio);
    index += dz->lparray[DISTTEL_STARTCYC][k];
    return b[index];
}

/*********************** INDEXED_VALUE_AT_CROSBUF ***********************/

float indexed_value_at_crosbuf(float *b,int k,double ratio,int current_buf,dataptr dz)
{
    int index = round((double)(dz->lparray[DISTTEL_CYCLEVAL][k])*ratio);
    index += dz->lparray[DISTTEL_STARTCYC][k];
    if(index >= dz->buflen) {
        index -= dz->buflen;
        b = dz->sampbuf[current_buf];
    }
    return b[index];
}

/************************ GET_LONGCYCLE *******************************
 *
 * Find longest cycle.
 */

int get_longcycle(int k,dataptr dz)
{
    int longest = 0;
    int n;
    for(n=0;n<k;n++) {
        if(dz->lparray[DISTTEL_CYCLEVAL][n] > longest)
            longest = dz->lparray[DISTTEL_CYCLEVAL][n];
    }
    return(longest);
}

/************************ GET_MEANCYCLE *******************************
 *
 * Find average cycle length.
 */

int get_meancycle(int k,dataptr dz)
{
    int sum = 0, mean;
    int n;
    for(n=0;n<k;n++)
        sum += dz->lparray[DISTTEL_CYCLEVAL][n];
    mean = round((double)sum/(double)k);
    return(mean);
}

/************************* OUTPUT_VAL **********************/

int output_val(float value,int *obufpos,dataptr dz)
{
    int exit_status;
    dz->sampbuf[2][(*obufpos)++] = value;
    if(*obufpos>=dz->buflen) {
        if((exit_status = write_samps(dz->sampbuf[2],dz->buflen,dz))<0)
            return(exit_status);
        *obufpos = 0;
    }
    return(FINISHED);
}
