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song.c
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song.c
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/*
* K2579 Step Sequencer - Song
*
* Copyright 2011: Kilpatrick Audio
* Written by: Andrew Kilpatrick
*
*/
#include <stdlib.h>
#include "song.h"
#include "scale.h"
#include "midi.h"
#define PADDING1_LEN 16
#define PADDING2_LEN 19
#define PADDING3_LEN 30
// sequence structure
typedef struct {
// page 0 - 32 bytes
unsigned char notes[2][SONG_NUM_STEPS]; // notes
// page 1 - 32 bytes
unsigned char step_len[SONG_NUM_STEPS]; // step lengths
unsigned char padding1[PADDING1_LEN]; // page 1 padding
// page 2 - 32 bytes
unsigned char start; // 0-15 = start position
unsigned char len; // 1-16 = length 1-16
unsigned char dir; // 0-3 = direction types
unsigned char loop; // 0-15 = number of loop times
unsigned char next; // 0-15 = next sequence to play
unsigned char gate1; // 1-48 = clock pulses (not divided)
unsigned char scale1; // 0-5 = scale types
unsigned char span1; // 1-4 = 1-4 octaves
char offset1; // -12 to +12 = -12 to +12 semitones
unsigned char gate2; // 1-48 = clock pulses (not divided)
unsigned char scale2; // 0-5 = scale types
unsigned char span2; // 1-4 = 1-4 octaves
char offset2; // -12 to +12 = -12 to +12 semitones
unsigned char padding2[PADDING2_LEN]; // page 2 padding
// page 3 - 32 bytes
unsigned char padding3[PADDING3_LEN]; // page 3 padding
unsigned char version; // the version number of the sequence data
unsigned char configured; // the configuration mark byte
} sequence;
sequence seqs[SONG_NUM_SEQ];
// intialize the song
void song_init(void) {
song_clear_song();
}
// load a buffer into a sequence
void song_load_seq_buf(unsigned char seq, unsigned char buf[]) {
int i;
if(seq > 15) return;
char *p = (char *)&seqs[seq];
for(i = 0; i < 128; i ++) {
*(p + i) = buf[i];
}
}
// save a buffer from a sequence
void song_save_seq_buf(unsigned char seq, unsigned char buf[]) {
int i;
if(seq > 15) return;
char *p = (char *)&seqs[seq];
for(i = 0; i < 128; i ++) {
buf[i] = *(p + i);
}
}
// clear the song
void song_clear_song(void) {
int i;
for(i = 0; i < SONG_NUM_SEQ; i++) {
song_clear_seq(i);
}
}
// clear a sequence
void song_clear_seq(unsigned char seq) {
if(seq > (SONG_NUM_SEQ - 1)) return;
int i;
seqs[seq].start = 0; // start at pos 1
seqs[seq].len = SONG_NUM_STEPS; // 16 steps
seqs[seq].dir = SONG_DIR_FWD; // forward
seqs[seq].loop = 0; // loop 0 times
seqs[seq].next = seq; // play this again
seqs[seq].gate1 = 5; // just less than 16th note at 24ppq
seqs[seq].scale1 = SCALE_CHROMATIC; // chromatic
seqs[seq].span1 = 4; // 4 octaves
seqs[seq].offset1 = 0; // normal offset
seqs[seq].gate2 = 5; // 16th note at 24ppq
seqs[seq].scale2 = SCALE_CHROMATIC; // chromatic
seqs[seq].span2 = 4; // 4 octaves
seqs[seq].offset2 = 0; // normal offset
// step 1 plays a low note
seqs[seq].notes[0][0] = 0; // base note
seqs[seq].notes[1][0] = 0; // base note
seqs[seq].step_len[0] = 0; // default
// steps 2-16 are rests
for(i = 1; i < SONG_NUM_STEPS; i ++) {
seqs[seq].notes[0][i] = SONG_STEP_REST; // rest
seqs[seq].notes[1][i] = SONG_STEP_REST; // rest
seqs[seq].step_len[i] = 0; // default
}
// padding
for(i = 0; i < PADDING1_LEN; i ++) {
seqs[seq].padding1[i] = 0xe1;
}
for(i = 0; i < PADDING2_LEN; i ++) {
seqs[seq].padding2[i] = 0xe2;
}
for(i = 0; i < PADDING3_LEN; i ++) {
seqs[seq].padding3[i] = 0xe3;
}
seqs[seq].version = SONG_VERSION;
seqs[seq].configured = SONG_CONFIGURE_MARK;
}
// copy a sequence
void song_copy_seq(unsigned char dest, unsigned char src) {
int i;
if(src > (SONG_NUM_SEQ - 1)) return;
if(dest > (SONG_NUM_SEQ - 1)) return;
seqs[dest].start = seqs[src].start;
seqs[dest].len = seqs[src].len;
seqs[dest].dir = seqs[src].dir;
seqs[dest].loop = seqs[src].loop;
seqs[dest].next = seqs[src].next;
seqs[dest].gate1 = seqs[src].gate1;
seqs[dest].scale1 = seqs[src].scale1;
seqs[dest].span1 = seqs[src].span1;
seqs[dest].offset1 = seqs[src].offset1;
seqs[dest].gate2 = seqs[src].gate2;
seqs[dest].scale2 = seqs[src].scale2;
seqs[dest].span2 = seqs[src].span2;
seqs[dest].offset2 = seqs[src].offset1;
for(i = 0; i < SONG_NUM_STEPS; i ++) {
seqs[dest].notes[0][i] = seqs[src].notes[0][i];
seqs[dest].notes[1][i] = seqs[src].notes[1][i];
}
}
// get the seq start
unsigned char song_get_seq_start(unsigned char seq) {
if(seq > (SONG_NUM_STEPS - 1)) return 0;
return seqs[seq].start;
}
// set the seq start
void song_set_seq_start(unsigned char seq, unsigned char start) {
if(seq > (SONG_NUM_SEQ - 1)) return;
if(start > (SONG_NUM_STEPS - 1)) seqs[seq].start = (SONG_NUM_STEPS - 1);
else seqs[seq].start = start;
}
// get the seq len
unsigned char song_get_seq_len(unsigned char seq) {
if(seq > (SONG_NUM_SEQ - 1)) return 0;
return seqs[seq].len;
}
// set the seq len
void song_set_seq_len(unsigned char seq, unsigned char len) {
if(seq > (SONG_NUM_SEQ - 1)) return;
if(len > SONG_NUM_STEPS) seqs[seq].len = SONG_NUM_STEPS;
else seqs[seq].len = len;
}
// get a step length
unsigned char song_get_step_len(unsigned char seq, unsigned char step) {
if(seq > (SONG_NUM_SEQ - 1)) return 0;
if(step > (SONG_NUM_STEPS - 1)) return 0;
return seqs[seq].step_len[step];
}
// set a step length
void song_set_step_len(unsigned char seq, unsigned char step, unsigned char len) {
if(seq > (SONG_NUM_SEQ - 1)) return;
if(step > (SONG_NUM_STEPS - 1)) return;
if(len > 31) seqs[seq].step_len[step] = 31;
seqs[seq].step_len[step] = len;
}
// get the seq dir
unsigned char song_get_seq_dir(unsigned char seq) {
if(seq > (SONG_NUM_SEQ - 1)) return 0;
return seqs[seq].dir;
}
// set the seq dir
void song_set_seq_dir(unsigned char seq, unsigned char dir) {
if(seq > (SONG_NUM_SEQ - 1)) return;
if(dir > SONG_MAX_DIR) seqs[seq].dir = SONG_MAX_DIR;
else seqs[seq].dir = dir;
}
// get the seq loop
unsigned char song_get_seq_loop(unsigned char seq) {
if(seq > (SONG_NUM_SEQ - 1)) return 0;
return seqs[seq].loop;
}
// set the seq loop
void song_set_seq_loop(unsigned char seq, unsigned char loop) {
if(seq > (SONG_NUM_SEQ - 1)) return;
if(loop > SONG_MAX_LOOPS) seqs[seq].loop = SONG_MAX_LOOPS;
else seqs[seq].loop = loop;
}
// get the seq next
unsigned char song_get_seq_next(unsigned char seq) {
if(seq > (SONG_NUM_SEQ - 1)) return 0;
return seqs[seq].next;
}
// set the seq next
void song_set_seq_next(unsigned char seq, unsigned char next) {
if(seq > (SONG_NUM_SEQ - 1)) return;
if(next > SONG_NUM_SEQ - 1) seqs[seq].next = SONG_NUM_SEQ - 1;
else seqs[seq].next = next;
}
// get a seq note
unsigned char song_get_note(unsigned char seq, unsigned char part, unsigned char step) {
if(seq > (SONG_NUM_SEQ - 1)) return 0;
if(part > 1) return 0;
if(step > (SONG_NUM_STEPS - 1)) return 0;
return seqs[seq].notes[part][step];
}
// set a seq note
//
// - note range should be 0-63 = 0-48 (notes) and 254-255 (extended note types)
// - notes saved with their raw values
// - prescale the value based on the span - for input control
//
void song_set_note(unsigned char seq, unsigned char part, unsigned char step, unsigned char note) {
if(seq > (SONG_NUM_SEQ - 1)) return;
if(part > 1) return;
if(step > (SONG_NUM_STEPS - 1)) return;
if(note < 49) seqs[seq].notes[part][step] = note;
else if(note == SONG_STEP_RAND) seqs[seq].notes[part][step] = SONG_STEP_RAND;
else if(note == SONG_STEP_NONE) seqs[seq].notes[part][step] = SONG_STEP_NONE;
else if(note == SONG_STEP_REST) seqs[seq].notes[part][step] = SONG_STEP_REST;
}
// get the seq gate
unsigned char song_get_gate(unsigned char seq, unsigned char part) {
if(seq > (SONG_NUM_SEQ - 1)) return 0;
if(part > 1) return 0;
if(part == 1) return seqs[seq].gate2;
return seqs[seq].gate1;
}
// set the seq gate
void song_set_gate(unsigned char seq, unsigned char part, unsigned char gate) {
unsigned char gat = gate;
if(gat > 48) gat = 48;
else if(gat < 1) gat = 1;
if(seq > (SONG_NUM_SEQ - 1)) return;
if(part > 1) return;
if(part == 1) seqs[seq].gate2 = gat;
else seqs[seq].gate1 = gat;
}
// set the seq scale
unsigned char song_get_scale(unsigned char seq, unsigned char part) {
if(seq > (SONG_NUM_SEQ - 1)) return 0;
if(part > 1) return 0;
if(part == 1) return seqs[seq].scale2;
return seqs[seq].scale1;
}
// get the seq scale
void song_set_scale(unsigned char seq, unsigned char part, unsigned char scale) {
unsigned char scl = scale;
if(scl > 7) scl = 7;
if(seq > (SONG_NUM_SEQ - 1)) return;
if(part > 1) return;
if(part == 1) seqs[seq].scale2 = scl;
else seqs[seq].scale1 = scl;
}
// get the seq span
unsigned char song_get_span(unsigned char seq, unsigned char part) {
if(seq > (SONG_NUM_SEQ - 1)) return 0;
if(part > 1) return 0;
if(part == 1) return seqs[seq].span2;
return seqs[seq].span1;
}
// set the seq span
void song_set_span(unsigned char seq, unsigned char part, unsigned char span) {
unsigned char spn = span;
if(spn < 1) spn = 1;
else if(spn > 4) spn = 4;
if(seq > (SONG_NUM_SEQ - 1)) return;
if(part > 1) return;
if(part == 1) seqs[seq].span2 = spn;
else seqs[seq].span1 = spn;
}
// get the seq offset
char song_get_offset(unsigned char seq, unsigned char part) {
if(seq > (SONG_NUM_SEQ - 1)) return 0;
if(part > 1) return 0;
if(part == 1) return seqs[seq].offset2;
return seqs[seq].offset1;
}
// set the seq offset
void song_set_offset(unsigned char seq, unsigned char part, char offset) {
char offst = offset;
if(offst < -12) offst = -12;
else if(offst > 12) offst = 12;
if(seq > (SONG_NUM_SEQ - 1)) return;
if(part > 1) return;
if(part == 1) seqs[seq].offset2 = offst;
else seqs[seq].offset1 = offst;
}
// copy a part to the other part in the same seq
void song_part_copy(unsigned char seq, unsigned char part) {
int i;
if(part > 1) return;
for(i = 0; i < SONG_NUM_STEPS; i ++) {
seqs[seq].notes[(part + 1) & 0x01][i] = seqs[seq].notes[part][i];
}
}
// invert the intervals in the selected part
void song_part_invert(unsigned char seq, unsigned char part) {
if(part > 1) return;
int i;
for(i = 0; i < SONG_NUM_STEPS; i ++) {
if(seqs[seq].notes[part][i] < 49) {
seqs[seq].notes[part][i] = 48 - seqs[seq].notes[part][i];
}
}
}
// retrograde the selected part
void song_part_retrograde(unsigned char seq, unsigned char part) {
if(part > 1) return;
int i, j;
unsigned char temp;
j = SONG_NUM_STEPS - 1;
for(i = 0; i < (SONG_NUM_STEPS >> 1); i ++) {
temp = seqs[seq].notes[part][i];
seqs[seq].notes[part][i] = seqs[seq].notes[part][j];
seqs[seq].notes[part][j] = temp;
j --;
}
}
// randomize a part
void song_part_randomize(unsigned char seq, unsigned char part) {
if(part > 1) return;
int i;
for(i = 0; i < SONG_NUM_STEPS; i ++) {
song_set_note(seq, part, i, rand() & 0x3f);
}
}
// clear the selected part
void song_part_clear(unsigned char seq, unsigned char part) {
if(part > 1) return;
int i;
for(i = 0; i < SONG_NUM_STEPS; i ++) {
seqs[seq].notes[part][i] = SONG_STEP_REST; // rest
}
}
// get a random note - used for RAND note type
unsigned char song_get_rand_note(void) {
return (rand() & 0x3f) % 48;
}