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/*
extract.c:
Copyright (C) 1991 Barry Vercoe
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., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "csoundCore.h"
#include "sysdep.h" /* EXTRACT.C */
#include "extract.h"
extern int realtset(CSOUND *, SRTBLK *);
extern MYFLT realt(CSOUND *, MYFLT);
static void include(EXTRACT_STATICS*, SRTBLK *);
//#define STA(x) (extractStatics->x)
static const SRTBLK a0 = {
NULL, NULL, 0, 3, FL(0.0), FL(0.0), FL(0.0), FL(0.0), FL(0.0),
0, SP, "a 0 0 0\n"
};
static const SRTBLK f0 = {
NULL, NULL, 0, 2, FL(0.0), FL(0.0), FL(0.0), FL(0.0), FL(0.0),
0, SP, "f 0 0\n"
};
static const SRTBLK e = {
NULL, NULL, 0, 0, FL(0.0), FL(0.0), FL(0.0), FL(0.0), FL(0.0),
0, SP, "e\n"
};
static void alloc_globals(EXTRACT_STATICS* extractStatics)
{
memcpy(&extractStatics->a0, &a0, sizeof(SRTBLK));
memcpy(&extractStatics->f0, &f0, sizeof(SRTBLK));
memcpy(&extractStatics->e, &e, sizeof(SRTBLK));
}
void readxfil(CSOUND *csound, EXTRACT_STATICS* extractStatics,
FILE *xfp) /* read the extract control file */
{
int flag, all;
char s[128];
alloc_globals(extractStatics);
all = 1;
flag = 'i'; /* default -i flag supplied */
extractStatics->onsect = 1;
extractStatics->onbeat = FL(0.0); /* other default vals */
extractStatics->offsect = 999; extractStatics->offbeat = FL(0.0);
while (fscanf(xfp, "%100s", s) > 0) {
char *c = s;
int i;
//printf("string: %s\n", s);
switch (*c) {
case 'i':
all = 0;
// intended no break here
/* FALLTHRU */
case 'f':
case 't':
flag = *c++;
break;
default:
switch (flag) {
case 'i':
sscanf(s, "%d", &i);
//printf("i: %d\n", i);
if (LIKELY(i>=0 && i < INSMAX)) extractStatics->inslst[i] = 1;
else csound->Message(csound, Str("instrument number out of range"));
all = 0;
break;
case 'f':
//printf("f: %s\n", s);
#if defined(USE_DOUBLE)
CS_SSCANF(s, "%d:%lf", &extractStatics->onsect, &extractStatics->onbeat);
#else
CS_SSCANF(s, "%d:%f", &extractStatics->onsect, &extractStatics->onbeat);
#endif
break;
case 't':
//printf("t: %s\n");
extractStatics->offsect = extractStatics->onsect; /* default offsect */
#if defined(USE_DOUBLE)
CS_SSCANF(s, "%d:%lf", &extractStatics->offsect,&extractStatics->offbeat);
#else
CS_SSCANF(s, "%d:%f", &extractStatics->offsect, &extractStatics->offbeat);
#endif
}
}
}
//printf("extract read\n");
if (all) {
char *ip;
for (ip = &extractStatics->inslst[0];
ip < &extractStatics->inslst[INSMAX]; *ip++ = 1);
}
extractStatics->ontime = extractStatics->a0.newp3 =
extractStatics->a0.p3val = extractStatics->onbeat;
extractStatics->offtime = extractStatics->f0.newp2 =
extractStatics->f0.p2val = extractStatics->offbeat;
}
void extract(CSOUND *csound, EXTRACT_STATICS* extractStatics)
/* extract instr events within the time period */
{
SRTBLK *bp;
MYFLT turnoff, anticip;
int warped;
alloc_globals(extractStatics);
if ((bp = csound->frstbp) == NULL) /* if null file */
return;
if (++extractStatics->sectno > extractStatics->offsect) {
/* or later section, */
csound->frstbp = NULL;
return; /* return */
}
extractStatics->frstout = extractStatics->prvout = NULL;
if (extractStatics->sectno < extractStatics->onsect) {
/* for sects preceding, */
do {
switch (bp->text[0]) {
case 'f': /* include f's at time 0 */
bp->p2val = bp->newp2 = FL(1.0); /* time 1 for now!! */
include(extractStatics, bp);
break;
case 'w':
case 's':
case 'e':
include(extractStatics, bp); /* incl w,s,e verbatim */
break;
case 't':
case 'i':
case 'a':
break; /* but skip all t,i,a */
}
} while ((bp = bp->nxtblk) != NULL);
}
else { /* for sections in timespan: */
do {
switch(bp->text[0]) {
case 'w':
warped = realtset(csound, bp);
if (extractStatics->sectno == extractStatics->onsect && warped)
extractStatics->ontime = extractStatics->a0.newp3 =
realt(csound, extractStatics->onbeat);
if (extractStatics->sectno == extractStatics->offsect && warped)
extractStatics->offtime = extractStatics->f0.newp2 =
realt(csound, extractStatics->offbeat);
include(extractStatics, bp);
break;
case 't':
include(extractStatics, bp);
break;
case 'f':
casef: if (extractStatics->sectno == extractStatics->onsect &&
bp->newp2 < extractStatics->ontime)
bp->newp2 = extractStatics->ontime;
else if (extractStatics->sectno == extractStatics->offsect &&
bp->newp2 > extractStatics->offtime)
break;
if (extractStatics->sectno == extractStatics->onsect &&
!extractStatics->a0done) {
if (extractStatics->onbeat > 0)
include(extractStatics, &extractStatics->a0);
extractStatics->a0done++;
}
include(extractStatics, bp);
break;
case 'i':
if (!extractStatics->inslst[bp->insno]) /* skip insnos not required */
break;
if (bp->newp3 < 0) /* treat indef dur like f */
goto casef;
/* FALLTHRU */
case 'a':turnoff = bp->newp2 + bp->newp3; /* i and a: */
if (extractStatics->sectno == extractStatics->onsect) {
if (turnoff < extractStatics->ontime)
break;
if ((anticip = extractStatics->ontime - bp->newp2) > 0) {
if ((bp->newp3 -= anticip) < FL(0.001))
break;
bp->p3val -= extractStatics->onbeat - bp->p2val;
bp->newp2 = extractStatics->ontime;
bp->p2val = extractStatics->onbeat;
}
}
if (extractStatics->sectno == extractStatics->offsect) {
if (bp->newp2 >= extractStatics->offtime)
break;
if (turnoff > extractStatics->offtime) {
bp->newp3 = extractStatics->offtime - bp->newp2;
bp->p3val = extractStatics->offbeat - bp->p2val;
}
}
if (extractStatics->sectno == extractStatics->onsect &&
!extractStatics->a0done) {
if (extractStatics->onbeat > 0)
include(extractStatics, &extractStatics->a0);
extractStatics->a0done++;
}
include(extractStatics, bp);
break;
case 's':
case 'e':
if (extractStatics->sectno == extractStatics->offsect) {
include(extractStatics, &extractStatics->f0);
include(extractStatics, &extractStatics->e);
}
else include(extractStatics, bp);
break;
}
} while ((bp = bp->nxtblk) != NULL);
}
csound->frstbp = extractStatics->frstout;
if (extractStatics->prvout != NULL)
extractStatics->prvout->nxtblk = NULL;
}
/* wire a srtblk into the outlist */
static void include(EXTRACT_STATICS* extractStatics, SRTBLK *bp)
{
if (extractStatics->frstout == NULL) /* first one is special */
extractStatics->frstout = bp;
else extractStatics->prvout->nxtblk = bp; /* others just add onto list */
bp->prvblk = extractStatics->prvout; /* maintain the backptr */
extractStatics->prvout = bp; /* and get ready for next */
}
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