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1 /*
2  *  Copyright (c) 2015 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 #ifndef WEBRTC_STREAM_H_
11 #define WEBRTC_STREAM_H_
12 
13 #include "webrtc/common_types.h"
14 
15 namespace webrtc {
16 
17 enum NetworkState {
18   kNetworkUp,
19   kNetworkDown,
20 };
21 
22 // Common base class for streams.
23 class Stream {
24  public:
25   // Starts stream activity.
26   // When a stream is active, it can receive, process and deliver packets.
27   virtual void Start() = 0;
28   // Stops stream activity.
29   // When a stream is stopped, it can't receive, process or deliver packets.
30   virtual void Stop() = 0;
31   // Called to notify that network state has changed, so that the stream can
32   // respond, e.g. by pausing or resuming activity.
33   virtual void SignalNetworkState(NetworkState state) = 0;
34   // Called when a RTCP packet is received.
35   virtual bool DeliverRtcp(const uint8_t* packet, size_t length) = 0;
36 
37  protected:
~Stream()38   virtual ~Stream() {}
39 };
40 
41 // Common base class for receive streams.
42 class ReceiveStream : public Stream {
43  public:
44   // Called when a RTP packet is received.
45   virtual bool DeliverRtp(const uint8_t* packet,
46                           size_t length,
47                           const PacketTime& packet_time) = 0;
48 };
49 
50 // Common base class for send streams.
51 // A tag class that denotes send stream type.
52 class SendStream : public Stream {};
53 
54 }  // namespace webrtc
55 
56 #endif  // WEBRTC_STREAM_H_
57