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3daf696188
This is to ensure Epoch is the same if transport switch to TCP or another transport. First packet received will always be timestamped with rtc::TimeMicros. Other packet timstamps will use the kernel timestamp as an offset from the first packet timestamp. For BWE, it is important that there is not a large time base diff if transport change. This change is protected by the experiment WebRTC-SCM-Timestamp. Bug: webrtc:14066 Change-Id: Iaeb49831e7019e21601bc90895ac56003a54e206 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/281000 Reviewed-by: Evan Shrubsole <eshr@webrtc.org> Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org> Commit-Queue: Per Kjellander <perkj@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38587}
77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_ASYNC_UDP_SOCKET_H_
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#define RTC_BASE_ASYNC_UDP_SOCKET_H_
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#include <stddef.h>
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#include <cstdint>
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#include <memory>
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#include "absl/types/optional.h"
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#include "api/sequence_checker.h"
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#include "rtc_base/async_packet_socket.h"
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#include "rtc_base/socket.h"
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#include "rtc_base/socket_address.h"
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#include "rtc_base/socket_factory.h"
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#include "rtc_base/thread_annotations.h"
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namespace rtc {
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// Provides the ability to receive packets asynchronously. Sends are not
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// buffered since it is acceptable to drop packets under high load.
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class AsyncUDPSocket : public AsyncPacketSocket {
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public:
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// Binds `socket` and creates AsyncUDPSocket for it. Takes ownership
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// of `socket`. Returns null if bind() fails (`socket` is destroyed
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// in that case).
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static AsyncUDPSocket* Create(Socket* socket,
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const SocketAddress& bind_address);
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// Creates a new socket for sending asynchronous UDP packets using an
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// asynchronous socket from the given factory.
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static AsyncUDPSocket* Create(SocketFactory* factory,
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const SocketAddress& bind_address);
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explicit AsyncUDPSocket(Socket* socket);
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~AsyncUDPSocket() = default;
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SocketAddress GetLocalAddress() const override;
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SocketAddress GetRemoteAddress() const override;
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int Send(const void* pv,
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size_t cb,
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const rtc::PacketOptions& options) override;
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int SendTo(const void* pv,
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size_t cb,
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const SocketAddress& addr,
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const rtc::PacketOptions& options) override;
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int Close() override;
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State GetState() const override;
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int GetOption(Socket::Option opt, int* value) override;
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int SetOption(Socket::Option opt, int value) override;
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int GetError() const override;
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void SetError(int error) override;
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private:
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// Called when the underlying socket is ready to be read from.
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void OnReadEvent(Socket* socket);
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// Called when the underlying socket is ready to send.
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void OnWriteEvent(Socket* socket);
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RTC_NO_UNIQUE_ADDRESS webrtc::SequenceChecker sequence_checker_;
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std::unique_ptr<Socket> socket_;
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static constexpr int BUF_SIZE = 64 * 1024;
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char buf_[BUF_SIZE] RTC_GUARDED_BY(sequence_checker_);
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absl::optional<int64_t> socket_time_offset_ RTC_GUARDED_BY(sequence_checker_);
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};
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} // namespace rtc
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#endif // RTC_BASE_ASYNC_UDP_SOCKET_H_
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