Define Stream base classes

webrtc/stream.h

Index: webrtc/stream.h
diff --git a/webrtc/stream.h b/webrtc/stream.h
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+/*
+ *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#ifndef WEBRTC_STREAM_H_
+#define WEBRTC_STREAM_H_
+
+#include "webrtc/common_types.h"
+
+namespace webrtc {
+
+enum NetworkState {
+  kNetworkUp,
+  kNetworkDown,
+};
+
+// Common base class for streams.
+class Stream {
+ public:
+  // Starts stream activity.
+  // When a stream is active, it can receive, process and deliver packets.
+  virtual void Start() = 0;
+  // Stops stream activity.
+  // When a stream is stopped, it can't receive, process or deliver packets.
+  virtual void Stop() = 0;
+  // Called to notify that network state has changed, so that the stream can
+  // respond, e.g. by pausing or resuming activity.
+  virtual void SignalNetworkState(NetworkState state) = 0;
+  // Called when a RTCP packet is received.
+  virtual bool DeliverRtcp(const uint8_t* packet, size_t length) = 0;
+
+ protected:
+  virtual ~Stream() {}
+};
+
+// Common base class for receive streams.
+class ReceiveStream : public Stream {
+ public:
+  // Called when a RTP packet is received.
+  virtual bool DeliverRtp(const uint8_t* packet, size_t length) = 0;
+};
+
+// Common base class for send streams.
+// A tag class that denotes send stream type.
+class SendStream : public Stream {};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_STREAM_H_