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1 /*
2  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 // TODO(mflodman) ViEEncoder has a time check to not send key frames too often,
12 // move the logic to this class.
13 
14 #ifndef WEBRTC_VIDEO_ENCODER_STATE_FEEDBACK_H_
15 #define WEBRTC_VIDEO_ENCODER_STATE_FEEDBACK_H_
16 
17 #include <map>
18 #include <vector>
19 
20 #include "webrtc/base/constructormagic.h"
21 #include "webrtc/base/scoped_ptr.h"
22 #include "webrtc/typedefs.h"
23 
24 namespace webrtc {
25 
26 class CriticalSectionWrapper;
27 class EncoderStateFeedbackObserver;
28 class RtcpIntraFrameObserver;
29 class ViEEncoder;
30 
31 class EncoderStateFeedback {
32  public:
33   friend class EncoderStateFeedbackObserver;
34 
35   EncoderStateFeedback();
36   ~EncoderStateFeedback();
37 
38   // Adds an encoder to receive feedback for a set of SSRCs.
39   void AddEncoder(const std::vector<uint32_t>& ssrc, ViEEncoder* encoder);
40 
41   // Removes a registered ViEEncoder.
42   void RemoveEncoder(const ViEEncoder* encoder);
43 
44   // Returns an observer to register at the requesting class. The observer has
45   // the same lifetime as the EncoderStateFeedback instance.
46   RtcpIntraFrameObserver* GetRtcpIntraFrameObserver();
47 
48  protected:
49   // Called by EncoderStateFeedbackObserver when a new key frame is requested.
50   void OnReceivedIntraFrameRequest(uint32_t ssrc);
51   void OnReceivedSLI(uint32_t ssrc, uint8_t picture_id);
52   void OnReceivedRPSI(uint32_t ssrc, uint64_t picture_id);
53   void OnLocalSsrcChanged(uint32_t old_ssrc, uint32_t new_ssrc);
54 
55  private:
56   typedef std::map<uint32_t,  ViEEncoder*> SsrcEncoderMap;
57 
58   rtc::scoped_ptr<CriticalSectionWrapper> crit_;
59 
60   // Instance registered at the class requesting new key frames.
61   rtc::scoped_ptr<EncoderStateFeedbackObserver> observer_;
62 
63   // Maps a unique ssrc to the given encoder.
64   SsrcEncoderMap encoders_;
65 
66   RTC_DISALLOW_COPY_AND_ASSIGN(EncoderStateFeedback);
67 };
68 
69 }  // namespace webrtc
70 
71 #endif  // WEBRTC_VIDEO_ENCODER_STATE_FEEDBACK_H_
72