Added tool for reference less video analysis

webrtc/tools/frame_analyzer/reference_less_video_analysis.cc

+/*
+ *  Copyright (c) 2016 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.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "webrtc/tools/frame_analyzer/reference_less_video_analysis_lib.h"
+#include "webrtc/tools/simple_command_line_parser.h"
+
+int main(int argc, char** argv) {
+  // This captures the freezing metrics for reference less video analysis.
+  std::string program_name = argv[0];
+  std::string usage = "Outputs the freezing score by comparing current frame "
+      "with the previous frame.\nExample usage:\n" + program_name +
+      " --video_file=video_file.y4m\n"
+      "Command line flags:\n"
+      "  - video_file(string): Path of the video "
+      "file to be analyzed. Only y4m file format is supported.\n";
+
+  webrtc::test::CommandLineParser parser;
+
+  // Init the parser and set the usage message.
+  parser.Init(argc, argv);
+  parser.SetUsageMessage(usage);
+
+  parser.SetFlag("video_file", "");
+  parser.ProcessFlags();
+  if (parser.GetFlag("video_file").empty()) {
+    parser.PrintUsageMessage();
+    exit(EXIT_SUCCESS);
+  }
+  std::string video_file = parser.GetFlag("video_file");
+
+  return run_analysis(video_file);
+}