Add vp9 QP parser.

webrtc/video/video_loopback.cc

 /*
  *  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.
  */
 
@@ skipping 49 matching lines @@
             "Suspends video below the configured min bitrate.");
 
 DEFINE_int32(num_temporal_layers,
              1,
              "Number of temporal layers. Set to 1-4 to override.");
 int NumTemporalLayers() {
   return static_cast<int>(FLAGS_num_temporal_layers);
 }
 
 // Flags common with screenshare loopback, with equal default values.
-DEFINE_string(codec, "VP8", "Video codec to use.");
+DEFINE_string(codec, "VP9", "Video codec to use.");

[brandtr, 2017/05/19 14:10:27]

Is this an intentional change?

[jianj1, 2017/05/19 21:20:57]

Done.

It's just for test purpose. I forgot to change it back.

 std::string Codec() {
   return static_cast<std::string>(FLAGS_codec);
 }
 
 DEFINE_int32(selected_tl,
              -1,
              "Temporal layer to show or analyze. -1 to disable filtering.");
 int SelectedTL() {
   return static_cast<int>(FLAGS_selected_tl);
 }
@@ skipping 207 matching lines @@
 }  // namespace webrtc
 
 int main(int argc, char* argv[]) {
   ::testing::InitGoogleTest(&argc, argv);
   google::ParseCommandLineFlags(&argc, &argv, true);
   webrtc::test::InitFieldTrialsFromString(
       webrtc::flags::FLAGS_force_fieldtrials);
   webrtc::test::RunTest(webrtc::Loopback);
   return 0;
 }