How to use audioplayer/play in AppDesiner

I would like to use audioplayer and play function in the callback of AppDesigner. However, I cannot hear anything when playing in AppDesigner. If I use "sound" function, it works correctly, but "play" function dose not work to play sound.​

% Button pushed function: Button

function ButtonPushed(app, event)

​

load handel.mat;

playerObj = audioplayer(y,Fs);

start = 1;

stop = playerObj.SampleRate * 3;

play(playerObj,[start,stop]); % This does not work.

​

% load gong.mat;

% sound(y); % This works.

Answer 1

[MathWorks Support Team]

The root cause is that with audioplayer, when the callback exits, the audioplayer variable is deleted because it goes out of scope. Deleting it stops the playing.

To continue playing audio after the callback exits, use the playblocking function instead of the play function as below.

% Button pushed function: Button

function ButtonPushed(app, event)

​

load handel.mat;

playerObj = audioplayer(y,Fs);

start = 1;

stop = playerObj.SampleRate * 3;

playblocking(playerObj);

You can refer to further information about the above explanation at the following URL.

https://www.mathworks.com/help/releases/R2022b/matlab/import_export/record-and-play-audio.html#bsdl2fs-1