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ParallelFifths.c

/*      ParallelFifths.c

        Cscore control program which adds a copy of the input score
        to itself a perfect fifth higher.  Assumes that the p5 values
        of note events are frequency values in Hertz.

        Anthony Kozar
        June 10, 2004
        Feb. 12, 2007:  Updated for Csound 5.
 */

/*
    derived from
    cscore.c:

    Copyright (C) 1991 Barry Vercoe, John ffitch

    This file is part of Csound.

    The Csound 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.

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

#include "cscore.h"                              /*  CSCORE_DEFAULT.C   */

void cscore(CSOUND* cs)        /* callable from Csound or standalone cscore  */
                               /* csound -C will run Csound scores as normal */
{
    EVLIST *a, *b, *c;
    int i;

    /* read each section of the score, one at a time */
    while ( (a = cscoreListGetSection(cs)) != NULL && a->nevents > 0) {
      c = cscoreListSeparateTWF(cs, a);   /* separate non-i-statements to
                                             avoid copying them */
      b = cscoreListCopyEvents(cs, a);    /* copy event list a into b */
      a = cscoreListConcatenate(cs, a,c); /* recombine a & c */
      for ( i = 1; i <= b->nevents; i++ ) /* iterate over b: events have
                                             indices 1 to nevents */
          if ( b->e[i]->op == 'i' )
            b->e[i]->p[5] *= 1.50;        /* transpose list b up a fifth */
      a = cscoreListConcatenate(cs, a,b); /* combine lists a and b */
      cscoreListSort(cs, a);              /* must sort to play correctly */
      /* re-append the s statement -- must assign to a in case list grows! */
      a = cscoreListAppendStringEvent(cs, a,"s");
      cscoreListPut(cs, a);               /* output this section */
      cscoreListFreeEvents(cs, a);        /* reclaim the space */
      cscoreListFree(cs, b);
      cscoreListFree(cs, c);
    }

    if (a)      cscoreListFreeEvents(cs, a);    /* must reclaim space from lget()
                                                   above if non-NULL */
    a = cscoreListCreate(cs, 1);                /* allocate space for 1, not 0! */
    a = cscoreListAppendStringEvent(cs, a,"e"); /* must reassign a in case it
                                                   grows */
    cscoreListPut(cs, a);                       /* output the 'e' */
    cscoreListFreeEvents(cs, a);

    return;
}

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