StopFcn not working with audioplayer object

2020 4 7
0 个回答
更新时间：2020 4 8
8 次查看（30 天）

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I'm using App Designer with the following code:
app.Player = audioplayer(y, Fs);
app.Player.StopFcn = @PlayerStoppedFcn;
function PlayerStoppedFcn(audioplayer, ~)
% do something
end
However, this error appears regarding the StopFcn callback...
Warning: Error occurred while executing the listener callback for event Custom defined for class asyncio.Channel:
Error using internal.Callback.execute (line 128)
Undefined function 'PlayerStoppedFcn' for input arguments of type 'audioplayer'.
> In asyncio.Channel/onCustomEvent (line 473)
In asyncio.Channel>@(source,data)obj.onCustomEvent(data.Type,data.Data) (line 405)
Can you help? Thanks in advance.

3 个评论
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Geoff Hayes
Geoff Hayes 2020-4-8
John - it isn't clear from the error message whether the PlayerStoppedFcn cannot be found or whether there is a problem with the input to it. Is this function in a separate m-file that can be found in the MATLAB search path? Or is it embedded somewhere in your App.
One recommendation is to change the function signature
function PlayerStoppedFcn(audioplayer, ~)
The first input parameter is named audioplayer which is the same name as the built-in MATLAB audio player object. Just change this to something diffferent so as not to conflict
function PlayerStoppedFcn(playerObject, ~)
(depending upon your version of MATLAG this could be the object or a handle to the audio player object).
John D
John D 2020-4-8
Unfortunately, changing the name of 'audioplayer' didn't work.
The PlayerStoppedFcn is placed like so:
function PlayerStoppedFcn(obj, ~)
disp("Something");
end
function playaudio(app)
[y, Fs] = audioread("filename.wav");
app.Player = audioplayer(y, Fs);
app.Player.StopFcn = @PlayerStoppedFcn;
play(app.Player);
end
The playaudio(app) function is called from a UI control callback.
Hope this helps.
John D
John D 2020-4-8
After looking at it again, the following seems to work:
app.Player.StopFcn = createCallbackFcn(app, @PlayerStoppedFcn, true);
Thanks for your help nonetheless.

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R2019a

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John D
John D
2020-4-7

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John D
John D
2020-4-8

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