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GStreamer WebRTC demos

All demos use the same signalling server in the signalling/ directory

Downloading GStreamer

The GStreamer WebRTC implementation has now been merged upstream, and is in the GStreamer 1.14 release. Binaries can be found here:

https://gstreamer.freedesktop.org/download/

Building GStreamer from source

If you don't want to use the binaries provided by GStreamer or on your Linux distro, you can build GStreamer from source.

The easiest way to build the webrtc plugin and all the plugins it needs, is to use Cerbero. These instructions should work out of the box for all platforms, including cross-compiling for iOS and Android.

Building GStreamer manually from source

For hacking on the webrtc plugin, you may want to build manually using the git repositories:

Or with Meson gst-build:

https://gitlab.freedesktop.org/gstreamer/gst-build/

You may need to install the following packages using your package manager:

json-glib, libsoup, libnice, libnice-gstreamer1 (the gstreamer plugin for libnice, called gstreamer1.0-nice Debian)

Ubuntu 18.04

Here are the commands for Ubuntu 18.04.

sudo apt-get install -y gstreamer1.0-tools gstreamer1.0-nice gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-plugins-good libgstreamer1.0-dev git libglib2.0-dev libgstreamer-plugins-bad1.0-dev libsoup2.4-dev libjson-glib-dev

Filing bugs

Please only file bugs about the demos here. Bugs about GStreamer's WebRTC implementation should be filed on the GStreamer gitlab.

You can also find us on IRC by joining #gstreamer @ FreeNode.

Documentation

Currently, the best way to understand the API is to read the examples. This post breaking down the API should help with that:

http://blog.nirbheek.in/2018/02/gstreamer-webrtc.html

Examples

Building

Most of the examples that require a build process can be built using the meson build system in the top-level gst-examples directory by using the following commands:

cd /path/to/gst-examples
meson _builddir
ninja -C _builddir

Build outputs will be placed in the directory _builddir.

sendrecv: Send and receive audio and video

  • Serve the js/ directory on the root of your website, or open https://webrtc.nirbheek.in

    • The JS code assumes the signalling server is on port 8443 of the same server serving the HTML

  • Open the website in a browser and ensure that the status is "Registered with server, waiting for call", and note the id too.

Running the C version

  • Run webrtc-sendrecv --peer-id=ID with the id from the browser. You will see state changes and an SDP exchange.

Running the Python version

  • python3 -m pip install --user websockets
  • run python3 sendrecv/gst/webrtc_sendrecv.py ID with the id from the browser. You will see state changes and an SDP exchange.

The python version requires at least version 1.14.2 of gstreamer and its plugins.

Running the Rust version

  • Install a recent Rust toolchain, e.g. via rustup.
  • Run cargo build for building the executable.
  • Run cargo run -- --peer-id=ID with the id from the browser. You will see state changes and an SDP exchange.

With all versions, you will see a bouncing ball + hear red noise in the browser, and your browser's webcam + mic in the gst app.

You can pass a --server argument to all versions, for example --server=wss://127.0.0.1:8443.

Running the Java version

cd sendrecv/gst-java
./gradlew build
java -jar build/libs/gst-java.jar --peer-id=ID with the id from the browser.

You can optionally specify the server URL too (it defaults to wss://webrtc.nirbheek.in:8443):

java -jar build/libs/gst-java.jar --peer-id=1 --server=ws://localhost:8443

multiparty-sendrecv: Multiparty audio conference with N peers

  • Run _builddir/multiparty-sendrecv/gst/mp-webrtc-sendrecv --room-id=ID with ID as a room name. The peer will connect to the signalling server and setup a conference room.
  • Run this as many times as you like, each will spawn a peer that sends red noise and outputs the red noise it receives from other peers.
    • To change what a peer sends, find the audiotestsrc element in the source and change the wave property.
    • You can, of course, also replace audiotestsrc itself with autoaudiosrc (any platform) or pulsesink (on linux).
  • TODO: implement JS to do the same, derived from the JS for the sendrecv example.

TODO: Selective Forwarding Unit (SFU) example

  • Server routes media between peers
  • Participant sends 1 stream, receives n-1 streams

TODO: Multipoint Control Unit (MCU) example

  • Server mixes media from all participants
  • Participant sends 1 stream, receives 1 stream