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.
5 #ifndef MEDIA_CAST_RTCP_SENDER_RTCP_EVENT_SUBSCRIBER_H_
6 #define MEDIA_CAST_RTCP_SENDER_RTCP_EVENT_SUBSCRIBER_H_
10 #include "base/threading/thread_checker.h"
11 #include "media/cast/logging/logging_defines.h"
12 #include "media/cast/logging/raw_event_subscriber.h"
13 #include "media/cast/rtcp/rtcp_defines.h"
18 // The key should really be something more than just a RTP timestamp in order
19 // to differentiate between video and audio frames, but since the implementation
20 // only process video frame events, RTP timestamp only as key is fine.
21 typedef std::map<RtpTimestamp, RtcpEvent> RtcpEventMap;
23 // A RawEventSubscriber implementation with the following properties:
24 // - Only processes raw event types that are relevant for sending from cast
25 // sender to cast receiver via RTCP.
26 // - Captures information to be sent over to RTCP from raw event logs into the
27 // more compact RtcpEvent struct.
28 // - Orders events by RTP timestamp with a map.
29 // - Internally, the map is capped at a maximum size configurable by the caller.
30 // The subscriber only keeps the most recent events (determined by RTP
31 // timestamp) up to the size limit.
32 class SenderRtcpEventSubscriber : public RawEventSubscriber {
34 // |max_size_to_retain|: The object will keep up to |max_size_to_retain|
36 // in the map. Once threshold has been reached, an event with the smallest
37 // RTP timestamp will be removed.
38 SenderRtcpEventSubscriber(const size_t max_size_to_retain);
40 virtual ~SenderRtcpEventSubscriber();
42 // RawEventSubscriber implementation.
43 virtual void OnReceiveFrameEvent(const FrameEvent& frame_event) OVERRIDE;
44 virtual void OnReceivePacketEvent(const PacketEvent& packet_event) OVERRIDE;
45 virtual void OnReceiveGenericEvent(const GenericEvent& generic_event)
48 // Assigns all collected events since last invocation to |rtcp_events|, and
49 // clears |rtcp_events_|.
50 void GetRtcpEventsAndReset(RtcpEventMap* rtcp_events);
53 // If |rtcp_events_.size()| exceeds |max_size_to_retain_|, remove an oldest
55 // (determined by RTP timestamp) so its size no greater than
56 // |max_size_to_retain_|.
57 void TruncateMapIfNeeded();
59 const size_t max_size_to_retain_;
60 RtcpEventMap rtcp_events_;
62 // Ensures methods are only called on the main thread.
63 base::ThreadChecker thread_checker_;
65 DISALLOW_COPY_AND_ASSIGN(SenderRtcpEventSubscriber);
71 #endif // MEDIA_CAST_RTCP_SENDER_RTCP_EVENT_SUBSCRIBER_H_