Stopping a function in between GUI

I am writing a code for playing a sound (Sine wave).. Just like a music player I have to give a start button and stop button. Start button plays the sine wave from start and stop button stops the player. . My Problem is I wish to create an interrupt to stop the playing of sound on push button , and when I press the PLAY button Sine wave should play from starting

Here are my codes and figures

function varargout = controlsound1(varargin)
% CONTROLSOUND1 MATLAB code for controlsound1.fig
%      CONTROLSOUND1, by itself, creates a new CONTROLSOUND1 or raises the existing
%      singleton*.
%
%      H = CONTROLSOUND1 returns the handle to a new CONTROLSOUND1 or the handle to
%      the existing singleton*.
%
%      CONTROLSOUND1('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in CONTROLSOUND1.M with the given input arguments.
%
%      CONTROLSOUND1('Property','Value',...) creates a new CONTROLSOUND1 or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before controlsound1_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to controlsound1_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help controlsound1

% Last Modified by GUIDE v2.5 02-Mar-2016 12:47:31

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @controlsound1_OpeningFcn, ...
                   'gui_OutputFcn',  @controlsound1_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT

% --- Executes just before controlsound1 is made visible.
function controlsound1_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to controlsound1 (see VARARGIN)

% Choose default command line output for controlsound1
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes controlsound1 wait for user response (see UIRESUME)
% uiwait(handles.STOP);

% --- Outputs from this function are returned to the command line.
function varargout = controlsound1_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;

% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
fs = 44100; % Hz
t = 0:1/fs:10; % seconds
f = 440; % Hz

y = cos(2.*pi.*f.*t);

sound(y,fs,16);

% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
return;

Answer 1

[Geoff Hayes]

Max - rather than using the sound function to play the audio recording, consider using an audio player object which provides the ability to stop the audio playback. For example, in your play button callback, you could do

% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
fs = 44100; % Hz
t = 0:1/fs:10; % seconds
f = 440; % Hz
y = cos(2.*pi.*f.*t);

handles.hAudioPlayer = audioplayer(y,fs);
guidata(hObject, handles);
play(handles.hAudioPlayer);

The last three lines in the above code, we create the player, save the updated handles structure (which has a field for the handle to the audio player), and then start the (non-blocking) playback.

Now, in the stop button callback, you could do

% --- Executes on button press in pushbutton3.
function pushbutton3_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton3 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

if isfield(handles,'hAudioPlayer')
    stop(handles.hAudioPlayer);
end

We check to see if there exists an audio player handle field in the handles object, and if so, then we just stop the playback.

Try the above and see what happens!

[Max]

Hi Geoff ..It works .. Thank you for your timely suggestion.. Thank you so much.. I was really struggling using that sound command.. Thanks a lot :)

[Geoff Hayes]

Glad that it worked out, Max!