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refactor(song): Remove song length from Song and assume the user knows MAX_SAMPLES

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Trying to force a specific song length other than the default never quite worked, so we'll only support the default MAX_SAMPLES & will calculate it for the user in the user in the exported .h header file.
This commit is contained in:
Veikko Sariola
2020-11-29 22:12:29 +02:00
parent e2c6d4b70c
commit a1e7e82d6d
8 changed files with 27 additions and 21 deletions
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35
go4k/song.go
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@ -1,13 +1,15 @@
package go4k
import "errors"
import (
"errors"
"fmt"
)
type Song struct {
BPM int
Patterns [][]byte
Tracks []Track
SongLength int // in samples, 0 means calculate automatically from BPM and Track lengths, but can also set manually
Patch Patch
BPM int
Patterns [][]byte
Tracks []Track
Patch Patch
}
func (s *Song) PatternRows() int {
@ -74,13 +76,9 @@ func Play(synth Synth, song Song) ([]float32, error) {
for i := range curVoices {
curVoices[i] = song.FirstTrackVoice(i)
}
samples := song.SongLength
if samples <= 0 {
samples = song.TotalRows() * song.SamplesPerRow()
}
buffer := make([]float32, samples*2)
totaln := 0
rowtime := song.SamplesPerRow()
initialCapacity := song.TotalRows() * song.SamplesPerRow() * 2
buffer := make([]float32, 0, initialCapacity)
rowbuffer := make([]float32, song.SamplesPerRow()*2)
for row := 0; row < song.TotalRows(); row++ {
patternRow := row % song.PatternRows()
pattern := row / song.PatternRows()
@ -100,8 +98,15 @@ func Play(synth Synth, song Song) ([]float32, error) {
synth.Trigger(curVoices[t], note)
}
}
samples, _, _ := synth.Render(buffer[2*totaln:], rowtime)
totaln += samples
tries := 0
for rowtime := 0; rowtime < song.SamplesPerRow(); {
samples, time, _ := synth.Render(rowbuffer, song.SamplesPerRow()-rowtime)
rowtime += time
buffer = append(buffer, rowbuffer[:samples*2]...)
if tries > 100 {
return nil, fmt.Errorf("Song speed modulation likely so slow that row never advances; error at pattern %v, row %v", pattern, patternRow)
}
}
}
return buffer, nil
}