给一个python使用webrtc库的示例

这是一个使用webrtc库的Python示例代码：

import asyncio
import logging
import random

import aiortc
from aiortc import RTCPeerConnection, RTCSessionDescription
from aiortc.contrib.signaling import object_from_string, object_to_string


async def consume_signaling(pc, signaling):
    async for raw_data in signaling.subscribe():
        data = object_from_string(raw_data)
        if "offer" in data:
            offer = RTCSessionDescription(
                sdp=data["offer"]["sdp"], type=data["offer"]["type"]
            )
            await pc.setRemoteDescription(offer)
            answer = await pc.createAnswer()
            await pc.setLocalDescription(answer)
            await signaling.publish(
                object_to_string({"answer": {"sdp": pc.localDescription.sdp, "type": pc.localDescription.type}})
            )
        elif "candidate" in data:
            candidate = aiortc.RTCIceCandidate(sdp=data["candidate"]["candidate"], sdpMLineIndex=data["candidate"]["sdpMLineIndex"], sdpMid=data["candidate"]["sdpMid"])
            await pc.addIceCandidate(candidate)


async def run(name):
    # create signaling and peer connection
    signaling = aiortc.contrib.signaling.AsyncioWebSocketSignaling("wss://localhost:8080")
    pc = RTCPeerConnection()

    # add data channel
    channel = pc.createDataChannel("chat")

    @channel.on("message")
    def on_message(message):
        print(name, "recv", message)

    # consume signaling
    await consume_signaling(pc, signaling)

    # send random messages
    while True:
        await channel.send(str(random.randint(0, 1000)))


if __name__ == "__main__":
    logging.basicConfig(level=logging.INFO)

    loop = asyncio.get_event_loop()
    tasks = [run("Alice"), run("Bob")]
    loop.run_until_complete(asyncio.gather(*tasks))

此示例代码展示了如何在Python中使用webrtc库来创建一个数据通道连接。此代码需要运行在webRTC服务器上，同时需要两个用户进行连接，因为代码中使用了一个数据通道，用户可以通过该通道传输任何数据。如果您需要更多帮助，请参考webrtc库文档。