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refactor(vm): simplify flattenSequence code

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vsariola 2021-05-12 22:44:03 +03:00
parent a2723829da
commit 203e8a3ccc
1 changed files with 16 additions and 47 deletions
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63
vm/patterns.go
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@ -7,48 +7,26 @@ import (
"github.com/vsariola/sointu"
)
// fixPatternLength makes sure that every pattern is the same length. During
// composing. Patterns shorter than the given length are padded with 1 / "hold";
// patterns longer than the given length are cropped.
func fixPatternLength(patterns []sointu.Pattern, fixedLength int) [][]int {
patternData := make([]int, len(patterns)*fixedLength)
ret := make([][]int, len(patterns))
for i, pat := range patterns {
for j, note := range pat {
patternData[j] = int(note)
}
for j := len(pat); j < fixedLength; j++ {
patternData[j] = 1 // pad with hold
}
ret[i], patternData = patternData[:fixedLength], patternData[fixedLength:]
}
return ret
}
// flattenSequence looks up a sequence of patterns and concatenates them into a
// single linear array of notes. Note that variable length patterns are
// concatenated as such; call fixPatternLength first if you want every pattern
// to be constant length.
func flattenSequence(patterns [][]int, sequence []int, songLength int, rowsPerPattern int, releaseFirst bool) []int {
// flattenSequence returns the notes of a track in a single linear array of
// integer notes.
func flattenSequence(t sointu.Track, songLength int, rowsPerPattern int, releaseFirst bool) []int {
sumLen := rowsPerPattern * songLength
notes := make([]int, sumLen)
window := notes
k := 0
for i := 0; i < songLength; i++ {
patIndex := -1
if i < len(sequence) {
patIndex = sequence[i]
patIndex := t.Order.Get(i)
var pattern sointu.Pattern = nil
if patIndex >= 0 && patIndex < len(t.Patterns) {
pattern = t.Patterns[patIndex]
}
var k int
if patIndex >= 0 && patIndex < len(patterns) {
k = copy(window, patterns[patIndex])
for j := 0; j < rowsPerPattern; j++ {
note := int(pattern.Get(j))
if releaseFirst && i == 0 && j == 0 && note == 1 {
note = 0
}
notes[k] = note
k++
}
for ; k < rowsPerPattern; k++ {
window[k] = 1 // pad with holds
}
if i == 0 && window[0] == 1 && releaseFirst {
window[0] = 0
}
window = window[rowsPerPattern:]
}
return notes
}
@ -168,20 +146,11 @@ func intsToBytes(array []int) ([]byte, error) {
return ret, nil
}
func bytesToInts(array []byte) []int {
ret := make([]int, len(array))
for i, v := range array {
ret[i] = int(v)
}
return ret
}
func ConstructPatterns(song *sointu.Song) ([][]byte, [][]byte, error) {
sequences := make([][]byte, len(song.Score.Tracks))
var patterns [][]int
for i, t := range song.Score.Tracks {
fixed := fixPatternLength(t.Patterns, song.Score.RowsPerPattern)
flat := flattenSequence(fixed, t.Order, song.Score.Length, song.Score.RowsPerPattern, true)
flat := flattenSequence(t, song.Score.Length, song.Score.RowsPerPattern, true)
dontCares := markDontCares(flat)
// TODO: we could give the user the possibility to use another length during encoding that during composing
chunks := splitSequence(dontCares, song.Score.RowsPerPattern)