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QUIC with GStreamer & Rust
Sanchayan Maity
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Who

  • Who am I?
    • Embedded Systems background
    • Prefer C, Haskell and Rust
    • Organize and speak at Rust and Haskell meet-ups in Bangalore
  • Work?
    • Software Engineer @ asymptotic
    • Open source consulting firm based out of Bangalore and Toronto
    • Work on low level systems software centred around multimedia
    • GStreamer, PipeWire, PulseAudio
    • Language Polyglots

Open source contributions

Agenda

  • QUIC which is a UDP-Based Multiplexed and Secure Transport and standardized in RFC 9000
  • Whirlwind tour of GStreamer
  • QUIC implementations in Rust
  • QUIC support in GStreamer
  • Demo
  • Future work

QUIC

  • QUIC is pronounced exactly like the English word "quick"
  • Not an acronym
  • Reliable and secure transport protocol
  • Addresses some of the known shortcomings of doing HTTP/2 over TCP and TLS
  • Standardized QUIC in RFC 9000
  • Supported by RFC 8999, RFC 9001 and RFC 9002

Building on shoulders of giants

  • HTTP/2 RFC7540 published in May 2015
  • Makes use of multiplexing
    • Multiple logical streams over same logical connection
    • Better congestion control
    • Makes better use of TCP with bandwidth saturation
    • Less bandwidth consumption due to header compression

Head of line blocking1

HOL Blocking{width=80%}

Protocol

  • Something new?
  • TCP?
  • UDP?

Security/encryption

  • No clear text version of the protocol
  • Negotiation employs cryptography and security with TLS 1.3

QUIC

  • Implemented on top of UDP
  • Uses UDP port numbers
  • Implements re-transmission, congestion control among others
  • Logical streams similar to HTTP/2
    • In-order
    • Reliable
    • Different streams can be out-of-order
  • Flow control
  • Fast handshakes (0-RTT and 1-RTT)

GStreamer

  • Multiplatform Pipeline based multimedia framework
  • Bindings for various languages
  • Allows building complex media processing workflows
  • Some applications
    • PiTiVi (Video Editor)
    • amaroK, Banshee, Clementine (audio players)
    • Empathy (VOIP and video conferencing)
    • GstLAL (gravitational wave data analysis)
    • Rygel (DLNA streaming server and renderer)
    • Totem (movie player for the GNOME desktop)

Simple pipeline

gst-launch-1.0 videotestsrc ! autovideosink
gst-launch-1.0 audiotestsrc ! autoaudiosink

Media pipeline2

Simple Player{width=80%}

Rust implementations

QUIC in GStreamer

  • Prior work
  • quinnquicsink and quinnquicsrc (Merged just a month ago)
  • Written in Rust
  • Uses quinn-rs
  • New elements quinnquicmux and quinnquicdemux to support stream multiplexing

Audio demo

gst-launch-1.0 -v -e audiotestsrc blocksize=4096 ! \
audio/x-raw,format=S16LE,rate=48000,channels=2,layout=interleaved ! \
opusenc ! quinnquicsink use-datagram=false secure-connection=false

gst-launch-1.0 -v -e audiotestsrc blocksize=4096 ! \
audio/x-raw,format=S16LE,rate=48000,channels=2,layout=interleaved ! \
opusenc ! quinnquicsink use-datagram=false secure-connection=false

Video demo

quin-quic-mux

  • Shows stream and datagram multiplexed on same connection
  • Merge request: !1634

Future work

References

Questions