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

PeerConnection's signaling methods are natively awaitable, so this runs inside an asyncio event loop:

import asyncio
import reactor_webrtc as rw

async def main():
    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 = await pc.create_offer()
    await pc.set_local_description(offer)

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

asyncio.run(main())

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

PeerConnection's signaling methods (create_offer, create_answer, set_local_description, set_remote_description, add_ice_candidate, get_stats) are natively awaitable — await them directly, no asyncio.to_thread()/executor wrapping needed. They still take a few milliseconds to resolve while the WebRTC engine responds, but that wait happens off the event loop thread, so it never blocks other coroutines.

Every other method (add_track, add_transceiver, transceivers, create_data_channel, and everything on Track/Transceiver/DataChannel) is a fast synchronous call with no native round-trip, and stays a plain function call — no await.

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

Data verified by PyPI on Aug 5, 2026
Data provided by the project maintainers, verified at the time the release was uploaded to PyPI.

Key dates

PyPI data
Data sourced directly from PyPI's database.
  • Released:
Newer release available (0.14.0)

Owner

PyPI data
Data sourced directly from PyPI's database.

GitHub Statistics

Data verified by PyPI on Aug 5, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License

Apache Software License (Apache-2.0)

Requires

Python >=3.10

Classifiers

Report project as malware

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distributions

No source distribution files available for this release.See tutorial on generating distribution archives.

Built Distributions

If you're not sure about the file name format, learn more about wheel file names.

reactor_webrtc-0.5.0-cp310-abi3-win_amd64.whl (8.0 MB view details)

Uploaded CPython 3.10+Windows x86-64

reactor_webrtc-0.5.0-cp310-abi3-manylinux_2_34_x86_64.whl (9.0 MB view details)

Uploaded CPython 3.10+manylinux: glibc 2.34+ x86-64

reactor_webrtc-0.5.0-cp310-abi3-manylinux_2_34_aarch64.whl (8.5 MB view details)

Uploaded CPython 3.10+manylinux: glibc 2.34+ ARM64

reactor_webrtc-0.5.0-cp310-abi3-macosx_13_0_x86_64.whl (8.2 MB view details)

Uploaded CPython 3.10+macOS 13.0+ x86-64

reactor_webrtc-0.5.0-cp310-abi3-macosx_11_0_arm64.whl (7.2 MB view details)

Uploaded CPython 3.10+macOS 11.0+ ARM64

File details

Details for the file reactor_webrtc-0.5.0-cp310-abi3-win_amd64.whl.

File metadata

File hashes

Hashes for reactor_webrtc-0.5.0-cp310-abi3-win_amd64.whl
Algorithm Hash digest
SHA256 24fbf5ee12cf7ee9483fac87ecfc55c4960e46d1dfb5f9f8b3474eeab616a5a2
MD5 ce8d72a5a96d1e71cf468776b0259cba
BLAKE2b-256 9a6682c9481fb06f813771c0acb214b4ba64e9a358731c00e426a3dd6fc77ecd

See more details on using hashes here.

Provenance

The following attestation bundles were made for reactor_webrtc-0.5.0-cp310-abi3-win_amd64.whl:

Publisher: publish.yml on reactor-team/reactor-webrtc

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file reactor_webrtc-0.5.0-cp310-abi3-manylinux_2_34_x86_64.whl.

File metadata

File hashes

Hashes for reactor_webrtc-0.5.0-cp310-abi3-manylinux_2_34_x86_64.whl
Algorithm Hash digest
SHA256 c85725bd575c63768c22649d4f819d4564849087d7fc1cecb70cb968e1231442
MD5 0a215a72d36582a22abfc8f3edeee4e0
BLAKE2b-256 991560a78b8ffd013f5ac0e2e18b1ee7a25816103a57e44fa60011efe6666504

See more details on using hashes here.

Provenance

The following attestation bundles were made for reactor_webrtc-0.5.0-cp310-abi3-manylinux_2_34_x86_64.whl:

Publisher: publish.yml on reactor-team/reactor-webrtc

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file reactor_webrtc-0.5.0-cp310-abi3-manylinux_2_34_aarch64.whl.

File metadata

File hashes

Hashes for reactor_webrtc-0.5.0-cp310-abi3-manylinux_2_34_aarch64.whl
Algorithm Hash digest
SHA256 e56d6c060ffd8bf3bcbd801d5d428853ce637fc4344e0ddd889642119e15c4d5
MD5 5ef691b1a80eaee6c3fc75cd92555e96
BLAKE2b-256 a4a6694d666af6181758c73bbd04eb793641df54eecf72eeaaf4fb04859ed415

See more details on using hashes here.

Provenance

The following attestation bundles were made for reactor_webrtc-0.5.0-cp310-abi3-manylinux_2_34_aarch64.whl:

Publisher: publish.yml on reactor-team/reactor-webrtc

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file reactor_webrtc-0.5.0-cp310-abi3-macosx_13_0_x86_64.whl.

File metadata

File hashes

Hashes for reactor_webrtc-0.5.0-cp310-abi3-macosx_13_0_x86_64.whl
Algorithm Hash digest
SHA256 9d9f69219f009410e9708b2ff518612533a15ab74c0457b270934b45ca6d7246
MD5 a9874e541417e3741eceaa754c4f4845
BLAKE2b-256 8446d9470441e160605f270c8fc132036c1fb78e32270aeab5e93e94fa5655a1

See more details on using hashes here.

Provenance

The following attestation bundles were made for reactor_webrtc-0.5.0-cp310-abi3-macosx_13_0_x86_64.whl:

Publisher: publish.yml on reactor-team/reactor-webrtc

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

File details

Details for the file reactor_webrtc-0.5.0-cp310-abi3-macosx_11_0_arm64.whl.

File metadata

File hashes

Hashes for reactor_webrtc-0.5.0-cp310-abi3-macosx_11_0_arm64.whl
Algorithm Hash digest
SHA256 221e0e3320a4dca6f53634c020932344e1c51732c598e3c0cfe9637a899e17ee
MD5 518970cf09b9fa944ad5bf67fc51003f
BLAKE2b-256 99a8ba1971970b34cd3b0dfdc77d3107387226291f0d33bf54796efa1abd932e

See more details on using hashes here.

Provenance

The following attestation bundles were made for reactor_webrtc-0.5.0-cp310-abi3-macosx_11_0_arm64.whl:

Publisher: publish.yml on reactor-team/reactor-webrtc

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Release history Release notifications | RSS feed

0.14.0

5 files

0.13.0

5 files

0.12.1

5 files

0.12.0

5 files

0.11.0

5 files

0.10.0

5 files

0.9.0

5 files

0.8.0

5 files

0.7.2

5 files

0.7.1

5 files

0.7.0

5 files

0.6.0

5 files

This release

0.5.0 This release

5 files

0.4.2

5 files

0.4.1

5 files

0.4.0

5 files

0.3.0

4 files

0.2.0

4 files

0.1.0

4 files

Anthropic, PBC Visionary sponsor Bloomberg Visionary sponsor Hudson River Trading Visionary sponsor Meta Visionary sponsor NVIDIA Visionary sponsor Microsoft Sustainability sponsor Depot Continuous Integration AWS Cloud computing and Security Sponsor Datadog Monitoring Fastly CDN Google Download Analytics Sentry Error logging StatusPage Status page