How can I make the function audioplayer global?

So basically i'm making a wav player that will apply some FX to the file that is loaded into the gui. There are currently just the 2 buttons "Load Wav" and "Play".

"Load Wav" searches for a file of the users choice as follows:

[FileName,PathName] = uigetfile({'*.wav'},'Load Wav File');
global x; %attempted to make the variables global so that the play callback can use the audioplayer function with (x, Fs)
global Fs;
[x,Fs] = audioread([PathName '/' FileName]);
handles.fileLoaded = 1;
guidata(hObject, handles);

Then in the "play" button is just:

player=audioplayer(x,Fs);
play(player);

The "Load Wav" button seems to store the data of the chosen file fine, however when the function for "playButton_Callback(hObject, eventdata, handles)" is used, it doesn't recognise the variables "x" or "Fs", even though they are stored as global variables.

Any help would be greatly appreciated, apologies if this is a simple question I'm relatively new to MatLab.

Answer 1

[Walter Roberson]

global variables need to be redeclared as global in every function they are to be used in.

[Magnus Woodgate]

Hi I tried this in:

global x;
global Fs;
player = audioplayer(x,Fs);
play(player);

But the audio still wouldn't play. However for some reason, using the "playblocking" feature it would play the chosen sample but obviously this means I cannot pause/resume/stop the audio but instead have to wait for it to complete.

Is there any way I can use the "play" feature still whilst using the global variables created from using the "audioread" data?

Thanks.

[Walter Roberson]

You are letting your player object go out of scope, which is resulting in the player object being deleted.

http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F