reactor-webrtc (Python)

Python bindings for the reactor-webrtc WebRTC engine, built with PyO3 and distributed as a self-contained wheel — no separate native library required at runtime.

Installation

pip install reactor-webrtc

Requires Python ≥ 3.10.

Quick start

import reactor_webrtc as rw

factory = rw.PeerConnectionFactory()

obs = rw.PeerConnectionObserver()
obs.on_ice_candidate = lambda c: relay_to_peer(c)
obs.on_connection_state_change = lambda s: print("state:", s)

config = rw.RtcConfiguration(ice_servers=[
    rw.IceServer(urls=["stun:stun.l.google.com:19302"]),
    # A turn:/turns: entry needs both credentials, or libwebrtc rejects the
    # whole configuration.
    rw.IceServer(urls=["turn:turn.example.com:3478"], username="alice", password="secret"),
])
pc = factory.create_peer_connection(config, obs)

offer = pc.create_offer()
pc.set_local_description(offer)

# Exchange offer.sdp with the remote peer via your signaling channel, then:
# pc.set_remote_description(remote_answer)
# pc.add_ice_candidate(candidate)

Audio

# Headless / server: push PCM programmatically (synthetic ADM, default)
factory = rw.PeerConnectionFactory()
factory.push_audio_frame(pcm_bytes, sample_rate=48000, channels=1)

# Desktop client: real mic + AEC3 + noise suppression
factory = rw.PeerConnectionFactory(
    platform_adm=True,
    echo_canceller=True,
    noise_suppression=True,
)

Pre-encoded video

factory, video = rw.PeerConnectionFactory.with_encoded_video_track(
    "camera", width=1280, height=720
)
pc = factory.create_peer_connection(config, obs)
tx = video.add_transceiver(pc, rw.TransceiverDirection.SendOnly)

# From your encoder thread:
video.push_encoded_frame(
    data=h264_annex_b,
    is_key_frame=True,
    width=1280, height=720,
)

Receiving media

obs = rw.PeerConnectionObserver()

def on_track(kind, track):
    if kind == rw.MediaKind.Video:
        track.on_video_frame(lambda bgra, w, h: display(bgra, w, h))
    elif kind == rw.MediaKind.Audio:
        track.on_audio_frame(lambda pcm, sr, ch, n: play(pcm))

obs.on_track = on_track

Stats

report = pc.get_stats()
for pair in report.candidate_pairs:
    print(pair.state, f"{pair.current_round_trip_time_s * 1000:.1f}ms")

API reference

Class Description
PeerConnectionFactory Entry point; creates peer connections and tracks
PeerConnection SDP offer/answer, ICE, tracks, data channels, stats
PeerConnectionObserver Callbacks: state, ICE candidate, track, data channel
RtcConfiguration ICE servers, ICE transport type, gathering policy
IceServer A STUN or TURN server entry
IceCandidate A trickled ICE candidate
SessionDescription SDP offer or answer (kind, sdp, ice_ufrags, with_ice_credentials)
Track Local (push frames) or remote (attach sink) media track
EncodedVideoTrack Push pre-encoded video (H.264 Annex-B, VP8, VP9, …)
Transceiver RTP m-section: mid, kind, set_track, set_direction
DataChannel SCTP data channel: send, on_message, on_open, …
StatsReport inbound_rtp, outbound_rtp, candidate_pairs
Enum Values
PeerConnectionState New, Connecting, Connected, Disconnected, Failed, Closed
IceGatheringState New, Gathering, Complete
TransceiverDirection SendRecv, SendOnly, RecvOnly, Inactive
MediaKind Audio, Video
DataChannelState Connecting, Open, Closing, Closed
IceCandidatePairState Waiting, InProgress, Failed, Succeeded, Cancelled
String-valued field Values
RtcConfiguration.ice_transport_type all (default), relay, no_host, none
RtcConfiguration.continual_gathering_policy once (default), continually

Choosing your own ICE credentials

libwebrtc generates the ICE ufrag and password itself and offers no setter. If something upstream needs to recognise a session by its ufrag — an edge relay that demultiplexes on it, say — substitute the credentials in the description before setting it locally:

answer = pc.create_answer()
answer = answer.with_ice_credentials(my_ufrag, my_password)
pc.set_local_description(answer)

answer.ice_ufrags()  # ["<my_ufrag>", ...] — one per m-section

The local description is what libwebrtc reads the transport's ICE parameters from, so the substituted values are the ones that end up on the wire.

Two things to get right:

  • Order. Setting the local description is what creates the transport and starts gathering, so substituting afterwards acts on nothing.
  • Renegotiation. Changing the credentials between generations is an ICE restart (RFC 8445 §9). On a renegotiation that is not meant to restart ICE, pass the values the session already uses.

Raises if a value is outside RFC 8445's ranges (ufrag 4–256 characters, password 22–256) or contains anything outside ice-char — which is also what stops a newline in a credential from injecting an SDP line.

Thread safety

Signaling methods (create_offer, set_local_description, etc.) block for a few milliseconds while the WebRTC engine responds. Wrap in asyncio.to_thread() when calling from an async context. Callbacks fire on WebRTC internal threads with the GIL acquired; keep them fast.

License

Apache-2.0. Upstream WebRTC is BSD-3-Clause + the WebRTC patent grant.

Project links

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  • Released:
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GitHub Statistics

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License

Apache Software License (Apache-2.0)

Requires

Python >=3.10

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