GENERALIZED CROSS CORRELATION xcorr of TWO SIMULTANEOUSLY RECORDED AUDIO SIGNALS!

Hi everyone! I'm trying to record two audio signals simultaneously and estimating the angle of sound source using the following code:

if true

fs = 48000 ; 

recObj1 = audiorecorder(fs, 16, 1, 1);

recObj2 = audiorecorder(fs, 16, 1, 2);

record(recObj1);      % recording starts

record(recObj2);       % recording starts

pause(5);                % recording for 5 seconds

stop(recObj1);           % recording stops

stop(recObj2);            % recording stops

out1 = getaudiodata(recObj1, 'int16');

out2 = getaudiodata(recObj2, 'int16');

[c, lags] = xcorr(out1, out2);

[a1, b1] = max(out1);

[a2, b2] = max(out2);

[a3, b3] = max(c);

s = lags(b3);

time_delay = s/fs ;

dis = 1 ; % distance between two microphones in meters

c = 342 ; % avg speed of sound at room temperature

   angle = acosd((time_delay*c)/dis);         % calculation of estimated angle

end

But the lags or time_delay is always different whenever I run the program again. IS it the right way of angle estimation using Cross Correlation function in MATLAB ? Please help if there is an efficient way of estimating the angles through slight changing or modification The sounds are being recorded by using 02 external USB microphones . Thank you!