func addNote() {
size := audio.SampleRate() / 60
notes := []float64{freqC, freqD, freqE, freqF, freqG, freqA * 2, freqB * 2}
defer func() {
scoreIndex++
scoreIndex %= len(score)
}()
l := make([]int16, size*30)
r := make([]int16, size*30)
note := score[scoreIndex]
for note == ' ' {
scoreIndex++
scoreIndex %= len(score)
note = score[scoreIndex]
}
freq := 0.0
switch {
case note == 'R':
freq = 0
case note <= 'B':
freq = notes[int(note)+len(notes)-int('C')]
default:
freq = notes[note-'C']
}
vol := 1.0 / 16.0
square(l, vol, freq, 0.25)
square(r, vol, freq, 0.25)
audio.Play(0, toBytes(l, r))
}
func addNote(freq float64, vol float64) {
f := int(freq)
if n, ok := noteCache[f]; ok {
audio.Play(-1, n)
return
}
length := len(pcm) * baseFreq / f
l := make([]int16, length)
r := make([]int16, length)
j := 0
jj := 0
for i := 0; i < len(l); i++ {
p := pcm[j]
l[i] = int16(p * vol * math.MaxInt16)
r[i] = l[i]
jj += f
j = jj / baseFreq
}
n := toBytes(l, r)
noteCache[f] = n
audio.Play(-1, n)
}