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