Cast: Add GetStats() extensions API.

media/cast/test/sender.cc

Index: media/cast/test/sender.cc
diff --git a/media/cast/test/sender.cc b/media/cast/test/sender.cc
index 16f55dcd234e0a69e2705d7a741c7a8ffe28f768..0ec130f759aff9497ee099c752f0816b235ce0ee 100644
--- a/media/cast/test/sender.cc
+++ b/media/cast/test/sender.cc
@@ -19,6 +19,7 @@
 #include "media/cast/logging/log_serializer.h"
 #include "media/cast/logging/logging_defines.h"
 #include "media/cast/logging/proto/raw_events.pb.h"
+#include "media/cast/logging/stats_serializer.h"
 #include "media/cast/test/utility/audio_utility.h"
 #include "media/cast/test/utility/input_builder.h"
 #include "media/cast/test/utility/video_utility.h"
@@ -382,6 +383,28 @@ void WriteLogsToFileAndStopSubscribing(
       &(*serialized_string)[0], 1, serialized_string->size(), log_file.get());
   if (ret != serialized_string->size())
     VLOG(1) << "Failed to write logs to file.";
+
+  scoped_ptr<std::string> audio_stats_json(new std::string);

[Alpha Left Google, 2014/03/03 07:11:39]

Stats updates every second so getting the stat once at the end is not very
useful. If we want to make it useful I'd prefer to print the information on the
receiver window.

[imcheng, 2014/03/04 02:06:24]

That sounds quite ambitious and that it'll take a while to implement. How about
write out the stats as a JSON string to a file every 5 seconds or so?

+  bool success = media::cast::SerializeStats(
+      cast_environment->Logging()->GetFrameStatsData(media::cast::AUDIO_EVENT),
+      cast_environment->Logging()->GetPacketStatsData(media::cast::AUDIO_EVENT),
+      audio_stats_json.get());
+
+  // We can write this string to a file if needed.
+  if (success)
+    VLOG(0) << "Audio stats JSON string: " << *audio_stats_json;
+  else
+    VLOG(1) << "Failed to write audio stats JSON string.";
+
+  scoped_ptr<std::string> video_stats_json(new std::string);
+  success = media::cast::SerializeStats(
+      cast_environment->Logging()->GetFrameStatsData(media::cast::VIDEO_EVENT),
+      cast_environment->Logging()->GetPacketStatsData(media::cast::VIDEO_EVENT),
+      video_stats_json.get());
+  if (success)
+    VLOG(0) << "Video stats JSON string: " << *video_stats_json;
+  else
+    VLOG(1) << "Failed to write video stats JSON string.";
 }
 
 }  // namespace