from bilibili_api import HEADERS
import httpx


def download_video(url: str):
    with httpx.stream("GET", url, headers=HEADERS) as r:
        length = int(r.headers["content-length"])
        received_bytes = 0
        with open("demo.m4a", "wb") as f:
            for chunk in r.iter_bytes(1024):
                if not chunk:
                    break
                received_bytes += len(chunk)
                f.write(chunk)
                print(f"downloaded {int(received_bytes / length * 100)}%")