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/*
sequencer.c:
Copyright (C) 2021 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., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "csoundCore.h"
#include <math.h>
typedef struct {
OPDS h;
MYFLT *res; /* state */
ARRAYDAT *riff; /* initial note row */
ARRAYDAT *instr; /* renderers for each note */
ARRAYDAT *data; /* extra data for pitch info */
MYFLT *kbpm; /* speed of sequence */
MYFLT *klen; /* Length of sequece to use */
MYFLT *mode; /* Mode; -1 backward,
0 loop frward;
+ve mutate
-1 backward
-2 back & forth
-3 random
-4 frward 1-shot
-5 backward 1-shot
-6 shuffle
-7 reset
*/
MYFLT *step; /* Step mode in force */
MYFLT *reset; /* Reser key */
MYFLT *verbos;
MYFLT *id; /* so can find it amonst others */
// Internals
int32_t max_length;
int cnt; /* Count loops for mutator */
int next; /* next step nuber */
int time; /* time in samples to next step */
int direction; /* direction of steps */
int seq[128];
} SEQ;
typedef struct {
OPDS h;
MYFLT *res; /* state */
ARRAYDAT *riff; /* opy intervnal array */
MYFLT *id;
SEQ *q;
} SEQSTATE;
static int32_t sequencer_init(CSOUND *csound, SEQ *p)
{
int i;
p->max_length = p->riff->sizes[0];
if (p->max_length != p->instr->sizes[0] ||
(p->data->dimensions == 2 && p->max_length != p->data->sizes[1]) ||
(p->data->dimensions == 1 && p->max_length != p->data->sizes[0]) ||
p->max_length >= 128) {
return csound->InitError(csound, Str("sequ: arrays have differing sizes"));
}
p->time = 0;
p->next = 0;
p->cnt = 1;
p->direction = 1; /* forwards */
for (i = 0; i<p->riff->sizes[0]; i++)
p->seq[i] = i;
/* for (i=0; i<p->riff->sizes[0]; i++) */
/* printf("%d: %d %f\n", i, (int)(p->instr->data[i]), p->riff->data[i]); */
SEQ **q;
if ((int)(*p->id)<0 || (int)(*p->id)>9)
return csound->InitError(csound, Str("sequ: id out of range"));
q = (SEQ**)csound->QueryGlobalVariable(csound, "sequGlobals");
if (q == NULL) {
csound->CreateGlobalVariable(csound, "sequGlobals", 10*sizeof(SEQ*));
q = (SEQ**)csound->QueryGlobalVariable(csound, "sequGlobals");
}
q[(int)*p->id] = p;
return OK;
}
static int32_t sequencer(CSOUND *csound, SEQ *p)
{
int len = (int)*p->klen;
int i = p->next;
int mode = (int)*p->mode;
if (len<=0) len = 1;
if (len>=p->max_length) len= p->max_length;
if (*p->step!=FL(0.0)) { /* Step style so no clock */
if (*p->step>=FL(0.0)) { /* a user call to move on */
p->time = 0;
}
else {
p->time = csound->ksmps;
*p->res = -FL(1.0);
return OK;
}
}
else if (*p->reset!= FL(0.0)) {
if (*p->verbos) printf("RESET!!\n");
goto minus7;
}
else if (p->time > 0) { /* Not yet time to act */
p->time -= csound->ksmps;
*p->res = -FL(1.0);
return OK;
}
/* Time for an event */
if (mode >= 0) {
if (i >= len) { // End of cycle
i = p->next = 0; p->direction = 1;
}
}
else {
switch (mode) {
case -1:
if (p->cnt==1 || i < 0) { /* backward and end of loop */
p->next = i = len-1;
p->direction = -1;
}
break;
case -2:
if (i<0|| i>=len) {
p->direction = -p->direction;
p->next = i += p->direction;
}
break;
case -3:
i = rand()%len; /* random selection */
break;
case -4:
p->direction = 1;
if (i>=len) {
*p->res = -1;
return OK;
}
break;
case -5:
p->direction = -1;
if (p->cnt==1) {
i = p->next = len-1;
}
else if (i<0) {
*p->res = -1;
return OK;
}
break;
case -6:
if (i>=len) {
int j, k = 0;
for (j =0; j<len; j++) {
k = rand() % (j+1);
if (k != j) p->seq[j] = p->seq[k];
p->seq[k] = j;
}
p->next = i = 0;
p->direction = 1;
}
break;
case -7:
minus7:
p->time = 0;
p->cnt = 1;
for (i = 0; i<p->riff->sizes[0]; i++)
p->seq[i] = i;
i = p->next = 0;
break;
case -8:
*p->res = -1;
return OK;
break;
}
}
{
MYFLT inst = p->instr->data[p->seq[i]];
if (inst != 0) {
char buff[100];
if (p->data->dimensions==2) {
int j;
snprintf(buff, 99, "i %0.2f 0 %f ",
inst, 60.0/(*p->kbpm)*p->riff->data[p->seq[i]]);
for (j=0; j< p->data->sizes[0]; j++)
snprintf(buff+strlen(buff), 99-strlen(buff), "%f ",
p->data->data[(j*p->max_length)+p->seq[i]]);
snprintf(buff+strlen(buff), 99-strlen(buff), "\n");
}
else
sprintf(buff, "i %0.2f 0 %f %f\n",
inst, 60.0/(*p->kbpm)*p->riff->data[p->seq[i]],
p->data->data[p->seq[i]]);
//printf("%s", buff);
csoundReadScore(csound, buff); /* schedule instr for event */
}
p->time = (p->riff->data[i] * csound->esr * 60.0) / *p->kbpm;
if (*p->verbos)
printf("Step %d riff %d instr %0.2f len %f\n",
i,p->seq[i], p->instr->data[p->seq[i]], p->riff->data[p->seq[i]]);
// Mutate every mode events
if (mode > 0 && len>1 && p->cnt%mode == 0) {
int r1, r2;
do {
r1 = rand()%len;
r2 = rand()%len;
} while (r1==r2);
{
int tm = p->seq[r1];
p->seq[r1] = p->seq[r2];
p->seq[r2] = tm;
if (*p->verbos)
printf("swap %d and %d\n", r1, r2);
}
}
*p->res = (MYFLT)i;
p->next += p->direction;
//if (*p->mode >=0) p->next++;
//else if (mode == -1) p->next--;
if (mode != -8) p->cnt++;
}
if (*p->verbos)
printf("Next Step %d time = %d samples\n", p->next, p->time);
return OK;
}
static int sequState(CSOUND *csound, SEQSTATE* p);
static int sequStateInit(CSOUND *csound, SEQSTATE* p)
{
int id = (int)*p->id;
SEQ **r = (SEQ**)csound->QueryGlobalVariable(csound, "sequGlobals");
if (r==NULL || r[id]==NULL) {
csound->Warning(csound, Str("No sequs"));
return OK;
}
p->q = r[id];
if (p->riff->sizes[0] != p->q->max_length)
csound->InitError(csound, Str("sequstate: Wrong sizeof output array"));
sequState(csound, p);
return OK;
}
static int sequState(CSOUND *csound, SEQSTATE* p)
{
SEQ* q = p->q;
int i;
int len = (int)*q->klen;
for (i=0; i<len; i++)
p->riff->data[i] = /* q->riff->data[*/ q->seq[i]/*]*/;
*p->res = (MYFLT)q->cnt;
return OK;
}
static OENTRY sequencer_localops[] =
{
{ "sequ", sizeof(SEQ), 0, 3, "k",
"i[]i[]i[]kkOOOoo",
(SUBR) sequencer_init, (SUBR) sequencer },
{ "sequstate.i", sizeof(SEQSTATE), 0, 1, "ii[]", "o",
(SUBR) sequStateInit },
{ "sequstate.k", sizeof(SEQSTATE), 0, 3, "kk[]", "o",
(SUBR) sequStateInit, (SUBR) sequState
}
};
LINKAGE_BUILTIN(sequencer_localops)
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