MSE: Log buffered audio splice generation to media-internals

media/base/media_log.cc

Index: media/base/media_log.cc
diff --git a/media/base/media_log.cc b/media/base/media_log.cc
index 754a5f924cee03f1dd8476993660f47165aeb199..f25468279a2d3364af72ddcbb1801c0c6a1e42a3 100644
--- a/media/base/media_log.cc
+++ b/media/base/media_log.cc
@@ -4,6 +4,8 @@
 
 #include "media/base/media_log.h"
 
+#include <algorithm>
+
 #include "base/atomic_sequence_num.h"
 #include "base/json/json_writer.h"
 #include "base/values.h"
@@ -14,6 +16,46 @@ namespace media {
 // 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:
@@ -72,6 +114,8 @@ std::string MediaLog::EventTypeToString(MediaLogEvent::Type type) {
       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:
@@ -227,6 +271,22 @@ scoped_ptr<MediaLogEvent> MediaLog::CreateBufferedExtentsChangedEvent(
   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);