main.py

import argparse
import asyncio
import json
import logging
import os
import platform
import ssl

from aiohttp import web

from aiortc import RTCPeerConnection, RTCSessionDescription
from aiortc.contrib.media import MediaPlayer, MediaRelay

ROOT = os.path.dirname(__file__)


relay = None
webcam = None


def create_local_tracks(play_from):
    global relay, webcam

    if play_from:
        player = MediaPlayer(play_from)
        return player.audio, player.video
    else:
        options = {"framerate": "30", "video_size": "640x480"}
        if relay is None:
            if platform.system() == "Darwin":
                webcam = MediaPlayer(
                    "default:none", format="avfoundation", options=options
                )
            elif platform.system() == "Windows":
                webcam = MediaPlayer(
                    "video=Integrated Camera", format="dshow", options=options
                )
            else:
                webcam = MediaPlayer("/dev/video0", format="v4l2", options=options)
            relay = MediaRelay()
        return None, relay.subscribe(webcam.video)


async def index(request):
    content = open(os.path.join(ROOT, "index.html"), "r").read()
    return web.Response(content_type="text/html", text=content)


async def javascript(request):
    content = open(os.path.join(ROOT, "client.js"), "r").read()
    return web.Response(content_type="application/javascript", text=content)


async def offer(request):
    params = await request.json()
    print(params)
    offer = RTCSessionDescription(sdp=params["sdp"], type=params["type"])

    pc = RTCPeerConnection()
    pcs.add(pc)

    @pc.on("connectionstatechange")
    async def on_connectionstatechange():
        print("Connection state is %s" % pc.connectionState)
        if pc.connectionState == "failed":
            await pc.close()
            pcs.discard(pc)

    # open media source
    audio, video = create_local_tracks(args.play_from)

    await pc.setRemoteDescription(offer)
    for t in pc.getTransceivers():
        if t.kind == "audio" and audio:
            pc.addTrack(audio)
        elif t.kind == "video" and video:
            pc.addTrack(video)

    answer = await pc.createAnswer()
    await pc.setLocalDescription(answer)

    return web.Response(
        content_type="application/json",
        text=json.dumps(
            {"sdp": pc.localDescription.sdp, "type": pc.localDescription.type}
        ),
    )


pcs = set()


async def on_shutdown(app):
    # close peer connections
    coros = [pc.close() for pc in pcs]
    await asyncio.gather(*coros)
    pcs.clear()


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="WebRTC webcam demo")
    parser.add_argument("--cert-file", help="SSL certificate file (for HTTPS)")
    parser.add_argument("--key-file", help="SSL key file (for HTTPS)")
    parser.add_argument("--play-from", help="Read the media from a file and sent it."),
    parser.add_argument(
        "--host", default="0.0.0.0", help="Host for HTTP server (default: 0.0.0.0)"
    )
    parser.add_argument(
        "--port", type=int, default=8080, help="Port for HTTP server (default: 8080)"
    )
    parser.add_argument("--verbose", "-v", action="count")
    args = parser.parse_args()

    if args.verbose:
        logging.basicConfig(level=logging.DEBUG)
    else:
        logging.basicConfig(level=logging.INFO)

    if args.cert_file:
        ssl_context = ssl.SSLContext()
        ssl_context.load_cert_chain(args.cert_file, args.key_file)
    else:
        ssl_context = None

    app = web.Application()
    app.on_shutdown.append(on_shutdown)
    app.router.add_get("/", index)
    app.router.add_get("/client.js", javascript)
    app.router.add_post("/offer", offer)
    web.run_app(app, host=args.host, port=args.port, ssl_context=ssl_context)