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From e24d95c0e06a878d401ee34fd6742fcaddeeb95f Mon Sep 17 00:00:00 2001 From: Joel Cunningham <joel.cunningham@me.com> Date: Mon, 9 Jan 2017 13:37:51 -0600 Subject: [PATCH] tcp: set socket buffer sizes before listen/connect/accept Attempting to set SO_RCVBUF and SO_SNDBUF on TCP sockets after connection establishment is incorrect and some stacks ignore the set call on the socket at this point. This has been observed on MacOS/iOS. Windows 7 has some peculiar behavior where setting SO_RCVBUF after applies only if the buffer is increasing from the default while decreases are ignored. This is possibly how the incorrect usage has gone unnoticed Unix Network Programming Vol. 1: The Sockets Networking API (3rd edition, seciton 7.5): "When setting the size of the TCP socket receive buffer, the ordering of the function calls is important. This is because of TCP's window scale option, which is exchanged with the peer on SYN segments when the connection is established. For a client, this means the SO_RCVBUF socket option must be set before calling connect. For a server, this means the socket option must be set for the listening socket before calling listen. Setting this option for the connected socket will have no effect whatsoever on the possible window scale option because accept does not return with the connected socket until TCP's three-way handshake is complete. This is why the option must be set on the listening socket. (The sizes of the socket buffers are always inherited from the listening socket by the newly created connected socket)" Signed-off-by: Joel Cunningham <joel.cunningham@me.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
FFmpeg README
FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.
Libraries
libavcodecprovides implementation of a wider range of codecs.libavformatimplements streaming protocols, container formats and basic I/O access.libavutilincludes hashers, decompressors and miscellaneous utility functions.libavfilterprovides a mean to alter decoded Audio and Video through chain of filters.libavdeviceprovides an abstraction to access capture and playback devices.libswresampleimplements audio mixing and resampling routines.libswscaleimplements color conversion and scaling routines.
Tools
- ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
- ffplay is a minimalistic multimedia player.
- ffprobe is a simple analysis tool to inspect multimedia content.
- ffserver is a multimedia streaming server for live broadcasts.
- Additional small tools such as
aviocat,ismindexandqt-faststart.
Documentation
The offline documentation is available in the doc/ directory.
The online documentation is available in the main website and in the wiki.
Examples
Coding examples are available in the doc/examples directory.
License
FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.
Contributing
Patches should be submitted to the ffmpeg-devel mailing list using
git format-patch or git send-email. Github pull requests should be
avoided because they are not part of our review process and will be ignored.