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// 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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_TRACK_METRICS_HOST_H_
#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_TRACK_METRICS_HOST_H_
#include <map>
#include <string>
#include "base/time/time.h"
#include "content/public/browser/browser_message_filter.h"
namespace content {
// Responsible for logging metrics about audio and video track
// lifetimes. These are based on messages from the renderer that are
// sent when tracks are created and destroyed. Unfortunately we can't
// reliably log the lifetime metric in the renderer because that
// process may be destroyed at any time by the fast shutdown path (see
// RenderProcessHost::FastShutdownIfPossible).
//
// There is one instance of this class per render process.
//
// If the renderer process goes away without sending messages that
// tracks were removed, this class instead infers that the tracks were
// removed.
class MediaStreamTrackMetricsHost
: public BrowserMessageFilter {
public:
explicit MediaStreamTrackMetricsHost();
protected:
~MediaStreamTrackMetricsHost() override;
// BrowserMessageFilter override.
bool OnMessageReceived(const IPC::Message& message) override;
private:
void OnAddTrack(uint64 id, bool is_audio, bool is_remote);
void OnRemoveTrack(uint64 id);
// Information for a track we're keeping in |tracks_|. |is_audio|
// specifies whether it's an audio or video track, |is_remote|
// specifies whether it's remote (received over a PeerConnection) or
// local (sent over a PeerConnection). |timestamp| specifies when
// the track was connected.
struct TrackInfo {
bool is_audio;
bool is_remote;
base::TimeTicks timestamp;
};
void ReportDuration(const TrackInfo& info);
// Values are unique (per renderer) track IDs.
typedef std::map<uint64, TrackInfo> TrackMap;
TrackMap tracks_;
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_TRACK_METRICS_HOST_H_
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