Cast: Provide more meaningful stats.

media/cast/logging/raw_event_subscriber_bundle.h

+// Copyright 2014 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.
+
+#ifndef MEDIA_CAST_LOGGING_RAW_EVENT_SUBSCRIBER_BUNDLE_H_
+#define MEDIA_CAST_LOGGING_RAW_EVENT_SUBSCRIBER_BUNDLE_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "media/cast/logging/encoding_event_subscriber.h"
+#include "media/cast/logging/stats_event_subscriber.h"
+
+namespace media {
+namespace cast {
+
+class CastEnvironment;
+class ReceiverTimeOffsetEstimator;
+
+// Allow 9MB for serialized video / audio event logs.
+const int kMaxSerializedBytes = 9000000;
+
+// Assume serialized log data for each frame will take up to 150 bytes.
+const int kMaxVideoEventEntries = kMaxSerializedBytes / 150;
+
+// Assume serialized log data for each frame will take up to 75 bytes.
+const int kMaxAudioEventEntries = kMaxSerializedBytes / 75;
+
+// A bundle for raw event subscribers for a single stream.
+// It contains an EncodingEventSubscriber and a StatsSubscriber.
+class RawEventSubscriberBundleForStream {
+ public:
+  RawEventSubscriberBundleForStream(
+      const scoped_refptr<CastEnvironment>& cast_environment,
+      bool is_audio,
+      ReceiverTimeOffsetEstimator* offset_estimator);
+  ~RawEventSubscriberBundleForStream();
+
+  EncodingEventSubscriber* GetEncodingEventSubscriber();
+  StatsEventSubscriber* GetStatsEventSubscriber();
+
+ private:
+  const scoped_refptr<CastEnvironment> cast_environment_;
+  EncodingEventSubscriber event_subscriber_;
+  StatsEventSubscriber stats_subscriber_;
+  
+  DISALLOW_COPY_AND_ASSIGN(RawEventSubscriberBundleForStream);
+};
+
+// A bundle of subscribers for all streams. An instance of this object
+// is associated with a CastEnvironment.
+// This class can be used for managing event subscribers
+// in a session where they could be multiple streams (i.e. CastSessionDelegate).
+// It also contains a ReceiverTimeOffsetEstimator that is shared by subscribers
+// of different streams.
+class RawEventSubscriberBundle {
+ public:
+  explicit RawEventSubscriberBundle(
+      const scoped_refptr<CastEnvironment>& cast_environment);
+  ~RawEventSubscriberBundle();
+
+  void AddEventSubscribers(bool is_audio);
+  void RemoveEventSubscribers(bool is_audio);
+  EncodingEventSubscriber* GetEncodingEventSubscriber(
+      bool is_audio);
+  StatsEventSubscriber* GetStatsEventSubscriber(bool is_audio);
+
+ private:
+  // Map from (is_audio) -> RawEventSubscriberBundleForStream.
+  // TODO(imcheng): This works because we only have 1 audio and 1 video stream.
+  // This needs to scale better.
+  typedef std::map<bool, linked_ptr<RawEventSubscriberBundleForStream> >
+      SubscribersMapByStream;
+  const scoped_refptr<CastEnvironment> cast_environment_;
+  SubscribersMapByStream subscribers_;
+  scoped_ptr<ReceiverTimeOffsetEstimator> receiver_offset_estimator_;
+  
+  DISALLOW_COPY_AND_ASSIGN(RawEventSubscriberBundle);
+};
+
+}  // namespace cast
+}  // namespace media
+
+#endif  // MEDIA_CAST_LOGGING_RAW_EVENT_SUBSCRIBER_BUNDLE_H_
+