Wait for sound to finish and then execute

I am trying to create a lamp that turns green while the audio is playing and red after the audio is played. I wrote the following function

function PlayxnButtonPushed(app, event)
             if(app.wav_flag == 1 && app.yn_flag ==0)
            app.playingxnLamp.Color = 'g';
            app.player = audioplayer(app.x, app.fs); 
            play(app.player,app.fs);
            while( strcmp(app.player.running,'on') )
            app.xn_flag = 1;  % Waiting for sound to finish here
            end
            end
           app.xn_flag = 0;
           app.playingxnLamp.Color = 'r';
        end

But it creates huge lag that I have to terminate the program using task manager.

Any idea how to fix this?

Thank you

Answer 1

[Steven Lord]

Instead of calling play on your audioplayer object you should call playblocking.

[Adham Elkhouly]

Thank you

[Adham Elkhouly]

it intially worked but now I get an error that says Invalid or deleted object.

if(app.wav_flag == 1 && app.yn_flag ==0)
            app.playingxnLamp.Color = 'g';
            app.player = audioplayer(app.x, app.fs); 
            app.xn_flag = 1;
            playblocking(app.player,app.fs);
            app.playingxnLamp.Color = 'r'; %<-- here
             end

Answer 2

[Walter Roberson]

Use a stopFcn callback https://www.mathworks.com/help/matlab/ref/audioplayer.html#mw_ce25e74d-6a00-44d6-9ae9-9a6e6335962c

[Adham Elkhouly]

Thank you