Improving i/o var handling of ita HOA A format to B format converter, now...

Improving i/o var handling of ita HOA A format to B format converter, now accepting 4 single channels both as in and out variables

applications/SpatialAudio/ita_hoa_a2bFormat.m

-function [bformat] = ita_hoa_a2bFormat(varargin)
-%ITA_HOA_A2BFORMAT Converts an A-Format recording to  B-Format
-%FLU,FRD,BLD,BRU
-%   Detailed explanation goes here
+function [ varargout ] = ita_hoa_a2bFormat(varargin)
+%ITA_HOA_A2BFORMAT Converts an A-Format recording to B-Format
+%
+% Input and requested output can be four-track multi-channel itaAudio or 4 single-channel
+% itaAudio objects.
+%
+% Channel assignment incoming: FLU, FRD, BLD, BRU
 % Back Right Up (BRU);
 % Front Left Up (FLU);
 % Front Right Down (FRD);
 % Back Left Down (BLD);
+%
+% Channel assignment outgoing: W, X, Y, Z
+%
 if nargin == 4
     FLU=varargin{1};
     FRD=varargin{2};
@@ -16,6 +22,7 @@ elseif nargin == 1
     FRD=varargin{1}.ch(2);
     BLD=varargin{1}.ch(3);
     BRU=varargin{1}.ch(4);
+    assert( varargin{1}.nChannels == 4 )
 else
     error('Need 4 channel input or 4 inputs');
 end
@@ -36,6 +43,12 @@ switch type
         Z = -FLD+FRU+BLU-BRD;
 end
 
-bformat = ita_merge(W,X,Y,Z);
+if nargout == 1
+    varargout{ 1 } = ita_merge(W,X,Y,Z);
+else
+    varargout{ 1 } = W;
+    varargout{ 2 } = X;
+    varargout{ 3 } = Y;
+    varargout{ 4 } = Z;
 end