STOP dsp.audioplayer object from a GUIDE

Hello everybody! I'm trying to make in a kind of multichannel audio recorder, using Matlab 2013b and working with the dsp tollbox.

I have a GUI with 2 buttons, one for reproduction and one for stop. When I press PLAY, I create a dsp.AudioReader and a dsp.AudioPlayer object, and I get sound from one channel of my interface. The reproduction stops when the file is ended.

What I need to do is to also stop reproduccion if somebody presses the STOP button. What i thought was to use a flag "recordingON" and use a While loop. Inside pushbuttonPLAY's calback I have something like:

    while (recordingON)
      do one step of reproduction.
      check new value of recordingON
    end

Then, if I pressed STOP, I changed recordingON to 0, recording should stop. I have tried it by saving the variable in one callback and loading it in ther other, by using globals, using guidata and directly reading the pushbutton stop:

    while (recordingON)
     do one step of record.
     recordingON = ~get(handles.pusshbuttonSTOP,'Value');
    end

while debbuging, everything goes OK. When I press pusshbuttonSTOP, recordingON changes to 0 and the reproduction is stopped. But in normal mode, the condition does not work, and the reproduction does not stop.

To check if the problem is due to dsp.Audio objects, I changed the content of the loop to simply:

   i = 0;
   while (recordingON)
     i = i+1;
     recordingON = ~get(handles.pusshbuttonSTOP,'Value');
   end

And "i" continues adding one and never stops (i have to press Control+C to cancel).

In the STOP button I added a breakpoint and the program goes to that point only when I cancel the audio reproduccion manually (I mean that MATLAB runs all the reproduction and only then goes inside STOP).

Which is the correct form to stop a while loop inside one callback from other ?

Thanks a lot!

Answer 1

[Sean de Wolski]

http://blogs.mathworks.com/pick/2014/10/24/stop/