style fixes for audioplayer and audiorecorder classes * @audioplayer/__get_properties__.m, @audioplayer/audioplayer.m, @audioplayer/display.m, @audioplayer/get.m, @audioplayer/isplaying.m, @audioplayer/pause.m, @audioplayer/play.m, @audioplayer/playblocking.m, @audioplayer/resume.m, @audioplayer/set.m, @audioplayer/stop.m, @audioplayer/subsasgn.m, @audioplayer/subsref.m, @audiorecorder/__get_properties__.m, @audiorecorder/audiorecorder.m, @audiorecorder/display.m, @audiorecorder/get.m, @audiorecorder/getaudiodata.m, @audiorecorder/getplayer.m, @audiorecorder/isrecording.m, @audiorecorder/pause.m, @audiorecorder/play.m, @audiorecorder/record.m, @audiorecorder/recordblocking.m, @audiorecorder/resume.m, @audiorecorder/set.m, @audiorecorder/stop.m, @audiorecorder/subsasgn.m, @audiorecorder/subsref.m: Style fixes. Do more basic argument checking. Use consistent style for error messages.

--- a/scripts/audio/@audiorecorder/getaudiodata.m	Fri Jan 02 16:54:34 2015 -0500
+++ b/scripts/audio/@audiorecorder/getaudiodata.m	Fri Jan 02 17:23:38 2015 -0500
@@ -27,10 +27,13 @@
 ## @end deftypefn
 
 function data = getaudiodata (varargin)
+
   if (nargin < 1 || nargin > 2)
     print_usage ();
   endif
+
   recorder = varargin{1};
+
   if (nargin == 1)
     data = __recorder_getaudiodata__ (struct (recorder).recorder);
   else
@@ -45,9 +48,11 @@
         data = uint8 ((data + 1.0) * 0.5 * (2.0 ^ 8 - 1));
     endswitch
   endif
+
   if (get (recorder, "NumberOfChannels") == 2)
     data = data';
   else
     data = data(1,:)';
   endif
+
 endfunction