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import argparse
import asyncio
import json
import logging
import os
import platform
import ssl
from aiohttp import web
from aiortc import RTCPeerConnection, RTCRtpSender, RTCSessionDescription
from aiortc.contrib.media import MediaPlayer, MediaRelay
ROOT = os.path.dirname(__file__)
relay = None
webcam = None
def create_local_tracks(play_from, decode):
global relay, webcam
if play_from:
player = MediaPlayer(play_from, decode=decode)
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)
def force_codec(pc, sender, forced_codec):
kind = forced_codec.split("/")[0]
codecs = RTCRtpSender.getCapabilities(kind).codecs
transceiver = next(t for t in pc.getTransceivers() if t.sender == sender)
transceiver.setCodecPreferences(
[codec for codec in codecs if codec.mimeType == forced_codec]
)
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()
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, decode=not args.play_without_decoding
)
if audio:
audio_sender = pc.addTrack(audio)
if args.audio_codec:
force_codec(pc, audio_sender, args.audio_codec)
elif args.play_without_decoding:
raise Exception("You must specify the audio codec using --audio-codec")
if video:
video_sender = pc.addTrack(video)
if args.video_codec:
force_codec(pc, video_sender, args.video_codec)
elif args.play_without_decoding:
raise Exception("You must specify the video codec using --video-codec")
await pc.setRemoteDescription(offer)
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(
"--play-without-decoding",
help=(
"Read the media without decoding it (experimental). "
"For now it only works with an MPEGTS container with only H.264 video."
),
action="store_true",
)
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")
parser.add_argument(
"--audio-codec", help="Force a specific audio codec (e.g. audio/opus)"
)
parser.add_argument(
"--video-codec", help="Force a specific video codec (e.g. video/H264)"
)
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)
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