How to terminate a spmd loop

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Star 2018-12-19
I have a spmd program as shown below:
function [output,frequency] = spmdfunc(music)
fid = fopen( 'music.mp3', 'r', 'b');
x = uint8( fread(fid, 'ubit1')');
while ( a+31 <= numel(x) )
if( x(a:a+14) == syncword)
poolobj = parpool (3);
spmd
if labindex == 1
afr = dsp.AudioFileReader(%Content);
while true
% Content
end
labSend(2, [])
release(afr)
elseif labindex == 2
while true
% Content
if isempty(frame)
labSend(3, []);
break
end
end
else
while true
if isempty (frame)
break
end
length = numel(output(1,:));
output(1,length+1:PCM_length+1152) = [samples(1,:) samples(3,:)];
output(2,length+1:PCM_length+1152) = [samples(2,:) samples(4,:)];
end
end %labindex
end %spmd end
delete(gcp);
end
a = a + 1;
end
%Display Waveform;
figure(1);
t=linspace(0,208,length(output(1,:)));
plot(t,output);
title('waveform');
end
It manage to run until the final bit, but it has problem in terminating the spmd loop. Means it could not display the waveform. It went back to labindex 1 and cause the error below:
Error detected on worker 1.
Attempted to access x(7.30154e+06); index out of bounds because numel(x)=7301528.
Any idea on the solution? Thank you.

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