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refactor: use [][2] as audio buffers, instead of []float32

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Throughout sointu, we assume stereo audiobuffers, but were passing
around []float32. This had several issues, including len(buf)/2 and
numSamples*2 type of length conversion in many places. Also, it
caused one bug in a test case, causing it to succeed when it should
have not (the test had +-1 when it should have had +-2). This
refactoring makes it impossible to have odd length buffer issues.
This commit is contained in:
5684185+vsariola@users.noreply.github.com
2023-10-18 13:51:02 +03:00
parent bb0d4d6800
commit 38e9007bf8
14 changed files with 106 additions and 82 deletions
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6
vm/compiler/bridge/bridge.go
View File

@ -79,15 +79,15 @@ func Synth(patch sointu.Patch, bpm int) (*BridgeSynth, error) {
// time > maxtime, as it is modulated and the time could advance by 2 or more, so the loop
// exit condition would fire when the time is already past maxtime.
// Under no conditions, nsamples >= len(buffer)/2 i.e. guaranteed to never overwrite the buffer.
func (bridgesynth *BridgeSynth) Render(buffer []float32, maxtime int) (int, int, error) {
func (bridgesynth *BridgeSynth) Render(buffer sointu.AudioBuffer, maxtime int) (int, int, error) {
synth := (*C.Synth)(bridgesynth)
// TODO: syncBuffer is not getting passed to cgo; do we want to even try to support the syncing with the native bridge
if len(buffer)%1 == 1 {
return -1, -1, errors.New("RenderTime writes stereo signals, so buffer should have even length")
}
samples := C.int(len(buffer) / 2)
samples := C.int(len(buffer))
time := C.int(maxtime)
errcode := int(C.su_render(synth, (*C.float)(&buffer[0]), &samples, &time))
errcode := int(C.su_render(synth, (*C.float)(&buffer[0][0]), &samples, &time))
if errcode > 0 {
return int(samples), int(time), &RenderError{errcode: errcode}
}

22
vm/compiler/bridge/bridge_test.go
View File

@ -59,7 +59,7 @@ func TestRenderSamples(t *testing.T) {
t.Fatalf("bridge compile error: %v", err)
}
synth.Trigger(0, 64)
buffer := make([]float32, 2*su_max_samples)
buffer := make(sointu.AudioBuffer, su_max_samples)
err = sointu.Render(synth, buffer[:len(buffer)/2])
if err != nil {
t.Fatalf("first render gave an error")
@ -96,7 +96,7 @@ func TestAllRegressionTests(t *testing.T) {
t.Fatalf("could not parse the .yml file: %v", err)
}
buffer, err := sointu.Play(bridge.BridgeService{}, song, false)
buffer = buffer[:song.Score.LengthInRows()*song.SamplesPerRow()*2] // extend to the nominal length always.
buffer = buffer[:song.Score.LengthInRows()*song.SamplesPerRow()] // extend to the nominal length always.
if err != nil {
t.Fatalf("Play failed: %v", err)
}
@ -134,7 +134,7 @@ func TestStackUnderflow(t *testing.T) {
if err != nil {
t.Fatalf("bridge compile error: %v", err)
}
buffer := make([]float32, 2)
buffer := make(sointu.AudioBuffer, 1)
err = sointu.Render(synth, buffer)
if err == nil {
t.Fatalf("rendering should have failed due to stack underflow")
@ -150,7 +150,7 @@ func TestStackBalancing(t *testing.T) {
if err != nil {
t.Fatalf("bridge compile error: %v", err)
}
buffer := make([]float32, 2)
buffer := make(sointu.AudioBuffer, 1)
err = sointu.Render(synth, buffer)
if err == nil {
t.Fatalf("rendering should have failed due to unbalanced stack push/pop")
@ -183,7 +183,7 @@ func TestStackOverflow(t *testing.T) {
if err != nil {
t.Fatalf("bridge compile error: %v", err)
}
buffer := make([]float32, 2)
buffer := make(sointu.AudioBuffer, 1)
err = sointu.Render(synth, buffer)
if err == nil {
t.Fatalf("rendering should have failed due to stack overflow, despite balanced push/pops")
@ -200,20 +200,20 @@ func TestDivideByZero(t *testing.T) {
if err != nil {
t.Fatalf("bridge compile error: %v", err)
}
buffer := make([]float32, 2)
buffer := make(sointu.AudioBuffer, 1)
err = sointu.Render(synth, buffer)
if err == nil {
t.Fatalf("rendering should have failed due to divide by zero")
}
}
func compareToRawFloat32(t *testing.T, buffer []float32, rawname string) {
func compareToRawFloat32(t *testing.T, buffer sointu.AudioBuffer, rawname string) {
_, filename, _, _ := runtime.Caller(0)
expectedb, err := ioutil.ReadFile(path.Join(path.Dir(filename), "..", "..", "..", "tests", "expected_output", rawname))
if err != nil {
t.Fatalf("cannot read expected: %v", err)
}
expected := make([]float32, len(expectedb)/4)
expected := make(sointu.AudioBuffer, len(expectedb)/8)
buf := bytes.NewReader(expectedb)
err = binary.Read(buf, binary.LittleEndian, &expected)
if err != nil {
@ -223,8 +223,10 @@ func compareToRawFloat32(t *testing.T, buffer []float32, rawname string) {
t.Fatalf("buffer length mismatch, got %v, expected %v", len(buffer), len(expected))
}
for i, v := range expected {
if math.IsNaN(float64(buffer[i])) || math.Abs(float64(v-buffer[i])) > 1e-6 {
t.Fatalf("error bigger than 1e-6 detected, at sample position %v", i)
for j, s := range v {
if math.IsNaN(float64(buffer[i][j])) || math.Abs(float64(s-buffer[i][j])) > 1e-6 {
t.Fatalf("error bigger than 1e-6 detected, at sample position %v", i)
}
}
}
}