rtpAnalyze matlab tool: filter out RTCP packets

tools/matlab/rtpAnalyze.m

 function rtpAnalyze( input_file )
 %RTP_ANALYZE Analyze RTP stream(s) from a txt file
 %   The function takes the output from the command line tool rtp_analyze
 %   and analyzes the stream(s) therein. First, process your rtpdump file
 %   through rtp_analyze (from command line):
 %   $ out/Debug/rtp_analyze my_file.rtp my_file.txt
 %   Then load it with this function (in Matlab):
 %   >> rtpAnalyze('my_file.txt')
 
 % Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
 %
 % Use of this source code is governed by a BSD-style license
 % that can be found in the LICENSE file in the root of the source
 % tree. An additional intellectual property rights grant can be found
 % in the file PATENTS.  All contributing project authors may
 % be found in the AUTHORS file in the root of the source tree.
 
 [SeqNo,TimeStamp,ArrTime,Size,PT,M,SSRC] = importfile(input_file);
 
+%% Filter out RTCP packets.
+% These appear as RTP packets having payload types 72 through 76.
+ix = not(ismember(PT, 72:76));
+fprintf('Removing %i RTCP packets\n', length(SeqNo) - sum(ix));
+SeqNo = SeqNo(ix);
+TimeStamp = TimeStamp(ix);
+ArrTime = ArrTime(ix);
+Size = Size(ix);
+PT = PT(ix);
+M = M(ix);
+SSRC = SSRC(ix);
+
 %% Find streams.
 [uSSRC, ~, uix] = unique(SSRC);
 
 % If there are multiple streams, select one and purge the other
 % streams from the data vectors. If there is only one stream, the
 % vectors are good to use as they are.
 if length(uSSRC) > 1
     for i=1:length(uSSRC)
         uPT = unique(PT(uix == i));
         fprintf('%i: %s (%d packets, pt: %i', i, uSSRC{i}, ...
@@ skipping 200 matching lines @@
 %% Allocate imported array to column variable names
 SeqNo = dataArray{:, 1};
 TimeStamp = dataArray{:, 2};
 SendTime = dataArray{:, 3};
 Size = dataArray{:, 4};
 PT = dataArray{:, 5};
 M = dataArray{:, 6};
 SSRC = dataArray{:, 7};
 end