content/browser/renderer_host/media/media_stream_track_metrics_host.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_TRACK_METRICS_HOST_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_TRACK_METRICS_HOST_H_
   7
   8 #include <map>
   9 #include <string>
  10
  11 #include "base/time/time.h"
  12 #include "content/public/browser/browser_message_filter.h"
  13
  14 namespace content {
  15
  16 // Responsible for logging metrics about audio and video track
  17 // lifetimes. These are based on messages from the renderer that are
  18 // sent when tracks are created and destroyed. Unfortunately we can't
  19 // reliably log the lifetime metric in the renderer because that
  20 // process may be destroyed at any time by the fast shutdown path (see
  21 // RenderProcessHost::FastShutdownIfPossible).
  22 //
  23 // There is one instance of this class per render process.
  24 //
  25 // If the renderer process goes away without sending messages that
  26 // tracks were removed, this class instead infers that the tracks were
  27 // removed.
  28 class MediaStreamTrackMetricsHost
  29     : public BrowserMessageFilter {
  30  public:
  31   explicit MediaStreamTrackMetricsHost();
  32
  33  protected:
  34   virtual ~MediaStreamTrackMetricsHost();
  35
  36   // BrowserMessageFilter override.
  37   virtual bool OnMessageReceived(const IPC::Message& message,
  38                                  bool* message_was_ok) OVERRIDE;
  39
  40  private:
  41   void OnAddTrack(uint64 id, bool is_audio, bool is_remote);
  42   void OnRemoveTrack(uint64 id);
  43
  44   // Information for a track we're keeping in |tracks_|. |is_audio|
  45   // specifies whether it's an audio or video track, |is_remote|
  46   // specifies whether it's remote (received over a PeerConnection) or
  47   // local (sent over a PeerConnection). |timestamp| specifies when
  48   // the track was connected.
  49   struct TrackInfo {
  50     bool is_audio;
  51     bool is_remote;
  52     base::TimeTicks timestamp;
  53   };
  54
  55   void ReportDuration(const TrackInfo& info);
  56
  57   // Values are unique (per renderer) track IDs.
  58   typedef std::map<uint64, TrackInfo> TrackMap;
  59   TrackMap tracks_;
  60 };
  61
  62 }  // namespace content
  63
  64 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_TRACK_METRICS_HOST_H_