MSE: Log buffered audio splice generation to media-internals

media/base/media_log.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/base/media_log.h"
 
+#include <algorithm>
+
 #include "base/atomic_sequence_num.h"
 #include "base/json/json_writer.h"
 #include "base/values.h"
 
 namespace media {
 
 // A count of all MediaLogs created in the current process. Used to generate
 // unique IDs.
 static base::StaticAtomicSequenceNumber g_media_log_count;
 
+MediaLog::AudioSpliceStatistics::AudioSpliceStatistics()
+    : count_(0),
+      degenerate_count_(0),
+      total_duration_(0.0),
+      min_duration_(0.0),
+      max_duration_(0.0) {
+}
+
+MediaLog::AudioSpliceStatistics::AudioSpliceStatistics(int count,
+                                                       int degenerate_count,
+                                                       double total_duration,
+                                                       double min_duration,
+                                                       double max_duration)
+    : count_(count),
+      degenerate_count_(degenerate_count),
+      total_duration_(total_duration),
+      min_duration_(min_duration),
+      max_duration_(max_duration) {
+}
+
+void MediaLog::AudioSpliceStatistics::OnSplice(double duration) {
+  if (count_) {
+    min_duration_ = std::min(min_duration_, duration);
+    max_duration_ = std::max(max_duration_, duration);
+    total_duration_ += duration;
+  } else {
+    min_duration_ = max_duration_ = total_duration_ = duration;
+  }
+
+  count_++;
+}
+
+void MediaLog::AudioSpliceStatistics::OnDegenerateSplice() {
+  degenerate_count_++;
+}
+
+double MediaLog::AudioSpliceStatistics::AverageDuration() const {
+  return (count_ > 0) ? total_duration_ / count_ : 0.0;
+}
+
 std::string MediaLog::MediaLogLevelToString(MediaLogLevel level) {
   switch (level) {
     case MEDIALOG_ERROR:
       return "error";
     case MEDIALOG_INFO:
       return "info";
     case MEDIALOG_DEBUG:
       return "debug";
   }
   NOTREACHED();
@@ skipping 38 matching lines @@
     case MediaLogEvent::TOTAL_BYTES_SET:
       return "TOTAL_BYTES_SET";
     case MediaLogEvent::NETWORK_ACTIVITY_SET:
       return "NETWORK_ACTIVITY_SET";
     case MediaLogEvent::ENDED:
       return "ENDED";
     case MediaLogEvent::TEXT_ENDED:
       return "TEXT_ENDED";
     case MediaLogEvent::BUFFERED_EXTENTS_CHANGED:
       return "BUFFERED_EXTENTS_CHANGED";
+    case MediaLogEvent::BUFFERED_AUDIO_SPLICE_STATISTICS_CHANGED:
+      return "BUFFERED_AUDIO_SPLICE_STATISTICS_CHANGED";
     case MediaLogEvent::MEDIA_ERROR_LOG_ENTRY:
       return "MEDIA_ERROR_LOG_ENTRY";
     case MediaLogEvent::MEDIA_INFO_LOG_ENTRY:
       return "MEDIA_INFO_LOG_ENTRY";
     case MediaLogEvent::MEDIA_DEBUG_LOG_ENTRY:
       return "MEDIA_DEBUG_LOG_ENTRY";
     case MediaLogEvent::PROPERTY_CHANGE:
       return "PROPERTY_CHANGE";
   }
   NOTREACHED();
@@ skipping 135 matching lines @@
   scoped_ptr<MediaLogEvent> event(
       CreateEvent(MediaLogEvent::BUFFERED_EXTENTS_CHANGED));
   // These values are headed to JS where there is no int64 so we use a double
   // and accept loss of precision above 2^53 bytes (8 Exabytes).
   event->params.SetDouble("buffer_start", start);
   event->params.SetDouble("buffer_current", current);
   event->params.SetDouble("buffer_end", end);
   return event.Pass();
 }
 
+scoped_ptr<MediaLogEvent> MediaLog::CreateBufferedSpliceStatisticsChangedEvent(
+    const AudioSpliceStatistics& statistics) {
+  scoped_ptr<MediaLogEvent> event(
+      CreateEvent(MediaLogEvent::BUFFERED_AUDIO_SPLICE_STATISTICS_CHANGED));
+  event->params.SetInteger("audio_splice_count", statistics.count());
+  event->params.SetInteger("audio_splice_degenerate_count",
+                           statistics.degenerate_count());
+  event->params.SetDouble("audio_splice_duration_average",
+                          statistics.AverageDuration());
+  event->params.SetDouble("audio_splice_duration_min",
+                          statistics.min_duration());
+  event->params.SetDouble("audio_splice_duration_max",
+                          statistics.max_duration());
+  return event.Pass();
+}
+
 void MediaLog::AddLogEvent(MediaLogLevel level, const std::string& message) {
   scoped_ptr<MediaLogEvent> event(CreateEvent(MediaLogLevelToEventType(level)));
   event->params.SetString(MediaLogLevelToString(level), message);
   AddEvent(event.Pass());
 }
 
 void MediaLog::SetStringProperty(
     const std::string& key, const std::string& value) {
   scoped_ptr<MediaLogEvent> event(CreateEvent(MediaLogEvent::PROPERTY_CHANGE));
   event->params.SetString(key, value);
@@ skipping 35 matching lines @@
                      const scoped_refptr<MediaLog>& media_log)
     : level_(level), media_log_(media_log) {
   DCHECK(media_log_.get());
 }
 
 LogHelper::~LogHelper() {
   media_log_->AddLogEvent(level_, stream_.str());
 }
 
 }  //namespace media