Reland: Replaced the SignalSelectedCandidatePairChanged with a new signal.
|packet_overhead| field is added to rtc::NetworkRoute structure.
In PackTransportInternal:
1. network_route() is added which returns the current network route.
2. debug_name() is removed.
3. transport_name() is moved from DtlsTransportInternal and
IceTransportInternal to PacketTransportInternal.
When the selected candidate pair is changed, the P2PTransportChannel
will fire the SignalNetworkRouteChanged instead of
SignalSelectedCandidatePairChanged to upper layers.
The Rtp/SrtpTransport takes the responsibility of calculating the
transport overhead from the BaseChannel so that the BaseChannel
doesn't need to depend on P2P layer transports.
TBR=pthatcher@webrtc.org
Bug: webrtc:7013
Change-Id: If9928b25a7259544c2d9c42048b53ab24292fc67
Reviewed-on: https://webrtc-review.googlesource.com/22767
Reviewed-by: Zhi Huang <zhihuang@webrtc.org>
Commit-Queue: Zhi Huang <zhihuang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20664}diff --git a/rtc_base/nethelper.h b/rtc_base/nethelper.h
new file mode 100644
index 0000000..e86d126
--- /dev/null
+++ b/rtc_base/nethelper.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2017 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 RTC_BASE_NETHELPER_H_
+#define RTC_BASE_NETHELPER_H_
+
+#include <cstdlib>
+#include <string>
+
+// This header contains helper functions and constants used by different types
+// of transports.
+namespace cricket {
+
+extern const char UDP_PROTOCOL_NAME[];
+extern const char TCP_PROTOCOL_NAME[];
+extern const char SSLTCP_PROTOCOL_NAME[];
+extern const char TLS_PROTOCOL_NAME[];
+
+// Get the network layer overhead per packet based on the IP address family.
+int GetIpOverhead(int addr_family);
+
+// Get the transport layer overhead per packet based on the protocol.
+int GetProtocolOverhead(const std::string& protocol);
+
+} // namespace cricket
+
+#endif // RTC_BASE_NETHELPER_H_