blob: 44d6c674267a6165f2b195f81f2d882f3364138f [file] [log] [blame]
* Copyright 2004 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.
#include "rtc_base/constructormagic.h"
#include "rtc_base/deprecation.h"
#include "rtc_base/dscp.h"
#include "rtc_base/socket.h"
#include "rtc_base/third_party/sigslot/sigslot.h"
#include "rtc_base/timeutils.h"
namespace rtc {
// This structure holds the info needed to update the packet send time header
// extension, including the information needed to update the authentication tag
// after changing the value.
struct PacketTimeUpdateParams {
PacketTimeUpdateParams(const PacketTimeUpdateParams& other);
int rtp_sendtime_extension_id = -1; // extension header id present in packet.
std::vector<char> srtp_auth_key; // Authentication key.
int srtp_auth_tag_len = -1; // Authentication tag length.
int64_t srtp_packet_index = -1; // Required for Rtp Packet authentication.
// This structure holds meta information for the packet which is about to send
// over network.
struct PacketOptions {
explicit PacketOptions(DiffServCodePoint dscp);
PacketOptions(const PacketOptions& other);
DiffServCodePoint dscp = DSCP_NO_CHANGE;
// When used with RTP packets (for example, webrtc::PacketOptions), the value
// should be 16 bits. A value of -1 represents "not set".
int64_t packet_id = -1;
PacketTimeUpdateParams packet_time_params;
// PacketInfo is passed to SentPacket when signaling this packet is sent.
PacketInfo info_signaled_after_sent;
// TODO( Compatibility alias, delete as soon as downstream
// code is updated.
typedef int64_t PacketTime;
// Provides the ability to receive packets asynchronously. Sends are not
// buffered since it is acceptable to drop packets under high load.
class AsyncPacketSocket : public sigslot::has_slots<> {
enum State {
~AsyncPacketSocket() override;
// Returns current local address. Address may be set to null if the
// socket is not bound yet (GetState() returns STATE_BINDING).
virtual SocketAddress GetLocalAddress() const = 0;
// Returns remote address. Returns zeroes if this is not a client TCP socket.
virtual SocketAddress GetRemoteAddress() const = 0;
// Send a packet.
virtual int Send(const void* pv, size_t cb, const PacketOptions& options) = 0;
virtual int SendTo(const void* pv,
size_t cb,
const SocketAddress& addr,
const PacketOptions& options) = 0;
// Close the socket.
virtual int Close() = 0;
// Returns current state of the socket.
virtual State GetState() const = 0;
// Get/set options.
virtual int GetOption(Socket::Option opt, int* value) = 0;
virtual int SetOption(Socket::Option opt, int value) = 0;
// Get/Set current error.
// TODO: Remove SetError().
virtual int GetError() const = 0;
virtual void SetError(int error) = 0;
// Emitted each time a packet is read. Used only for UDP and
// connected TCP sockets.
const char*,
const SocketAddress&,
// TODO( Change to passing the int64_t
// timestamp by value.
const int64_t&>
// Emitted each time a packet is sent.
sigslot::signal2<AsyncPacketSocket*, const SentPacket&> SignalSentPacket;
// Emitted when the socket is currently able to send.
sigslot::signal1<AsyncPacketSocket*> SignalReadyToSend;
// Emitted after address for the socket is allocated, i.e. binding
// is finished. State of the socket is changed from BINDING to BOUND
// (for UDP and server TCP sockets) or CONNECTING (for client TCP
// sockets).
sigslot::signal2<AsyncPacketSocket*, const SocketAddress&> SignalAddressReady;
// Emitted for client TCP sockets when state is changed from
sigslot::signal1<AsyncPacketSocket*> SignalConnect;
// Emitted for client TCP sockets when state is changed from
sigslot::signal2<AsyncPacketSocket*, int> SignalClose;
// Used only for listening TCP sockets.
sigslot::signal2<AsyncPacketSocket*, AsyncPacketSocket*> SignalNewConnection;
void CopySocketInformationToPacketInfo(size_t packet_size_bytes,
const AsyncPacketSocket& socket_from,
bool is_connectionless,
rtc::PacketInfo* info);
} // namespace rtc