Adding Media.InputStreamDuration to UMA histograms for low-latency input audio streams

media/audio/audio_input_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/audio/audio_input_controller.h"
 
 #include "base/bind.h"
+#include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/limits.h"
 #include "media/base/scoped_histogram_timer.h"
 #include "media/base/user_input_monitor.h"
 
 using base::TimeDelta;
 
@@ skipping 238 matching lines @@
                                                  const std::string& device_id) {
   DCHECK(task_runner_->BelongsToCurrentThread());
 
 #if defined(AUDIO_POWER_MONITORING)
   // We only log silence state UMA stats for low latency mode and if we use a
   // real device.
   if (params.format() != AudioParameters::AUDIO_FAKE)
     log_silence_state_ = true;
 #endif
 
+  low_latency_create_time_ = base::TimeTicks::Now();
   DoCreate(audio_manager, params, device_id);
 }
 
 void AudioInputController::DoCreateForStream(
     AudioInputStream* stream_to_control) {
   DCHECK(task_runner_->BelongsToCurrentThread());
 
   DCHECK(!stream_);
   stream_ = stream_to_control;
 
@@ skipping 64 matching lines @@
     handler_->OnRecording(this);
 }
 
 void AudioInputController::DoClose() {
   DCHECK(task_runner_->BelongsToCurrentThread());
   SCOPED_UMA_HISTOGRAM_TIMER("Media.AudioInputController.CloseTime");
 
   if (state_ == CLOSED)
     return;
 
-  if (handler_)
-    handler_->OnLog(this, "AIC::DoClose");
+  // If this is a low-latency stream, log the total duration (since DoCreate)
+  // and add it to a UMA histogram.
+  if (!low_latency_create_time_.is_null()) {
+    base::TimeDelta duration =
+        base::TimeTicks::Now() - low_latency_create_time_;
+    UMA_HISTOGRAM_LONG_TIMES("Media.InputStreamDuration", duration);
+    if (handler_) {
+      std::string log_string =
+          base::StringPrintf("AIC::DoClose: stream duration=");
+      log_string += base::Int64ToString(duration.InSeconds());
+      log_string += " seconds";
+      handler_->OnLog(this, log_string);
+    }
+  }
 
   // Delete the timer on the same thread that created it.
   no_data_timer_.reset();
 
   DoStopCloseAndClearStream();
   SetDataIsActive(false);
 
   if (SharedMemoryAndSyncSocketMode())
     sync_writer_->Close();
 
@@ skipping 240 matching lines @@
 }
 
 void AudioInputController::LogSilenceState(SilenceState value) {
   UMA_HISTOGRAM_ENUMERATION("Media.AudioInputControllerSessionSilenceReport",
                             value,
                             SILENCE_STATE_MAX + 1);
 }
 #endif
 
 }  // namespace media