MBS Audio stopping

SDKs Plugins
1

Okay…found some time to test the MBS Audio plugin…
And with a little tweaking I get the sweep sine wave with the Port Audio example app.

The Callback looks like this now to generate the sweep:

Var n,c,i As Integer
Var f As Single
Var increment As Single = frequency / 7639.437

PlayWindow.FrequencyLabel.Text = Str(frequency) + " Hz"

c=FrameCount-1
for i=0 to c
  sinIndex = sinIndex + increment
  if sinIndex>2*3.1415926 then sinIndex=sinIndex-2*3.1415926
  f = sin(sinIndex) / 2
  
  outputBuffer.SingleValue(n)=f // left
  n=n+4
  outputBuffer.SingleValue(n)=f // right
  n=n+4
next

If frequency <= 20000 then frequency = frequency + 20

Tried to stop the audio with a simple PlayWindow.Close as there is this Close event:

dim e as integer
if s<>nil then
  e=s.Stop
  e=s.Close
end if

But of course the app just hangs…
What is the correct way to stop the audio?

2

Can you send me the test project to debug?

Your callback does have “#pragma” lines to disable background tasks?

3

Yes…those are unchanged from the PortAudio example.

PortAudio.zip (37.0 KB)

Ops…forgot the Info.plist

info.plist.zip (866 Bytes)

4

Strange. Doesn’t happen here on macOS or Windows as far as I see.

Anyway, I see that the example does call abort or window.close from callback, which should not happen.

5

Happens on my MacStudio and Macbook Air here…

Is there a better way to stop the audio output when the sweep is through?

PS: Currently cooking sweet&sour and my girlfriend comes home soon…so a while afk (o;

6

Okay…either have to study the docs more or switch to another solution (o;

But sweet&sour was fine (o;

7

Well, if you like to have an easier live, don’t use the playback via callback, but via queue. That is easier.

See PortAudioStreamBufferedMBS class with buffer.