diff --git a/snippets/geturl.py b/snippets/geturl.py
new file mode 100644
index 0000000..b217664
--- /dev/null
+++ b/snippets/geturl.py
@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+
+from bilibili_api import video, sync
+
+
+def geturl(vn: str) -> str:
+    """Get audio download URL from AV or BV number with bilibili-api-python.
+
+    Parameters
+    ----------
+    vn : str
+        AV or BV number.
+
+    Returns
+    -------
+    str
+        URL of audio stream.
+
+    Raises
+    ------
+    InvalidVideoNumberException
+        If the format of AV or BV video number is invalid.
+    BiliBiliAPIException
+        If bilibili-api-python raises exception.
+    BadVideoException
+        If video is in flv format.
+    """
+
+    class InvalidVideoNumberException(Exception):
+        pass
+
+    class BiliBiliAPIException(Exception):
+        pass
+
+    class BadVideoException(Exception):
+        pass
+
+    if len(vn) <= 2:
+        raise InvalidVideoNumberException("Video number too short!")
+    if vn[:2].upper() == "AV":
+        if not vn[2:].isnumeric():
+            raise InvalidVideoNumberException("Invalid AV video number!")
+        else:
+            v = video.Video(aid="AV" + vn[2:])
+    if vn[:2].upper() != "BV":
+        raise InvalidVideoNumberException("Invalid video number!")
+    else:
+        v = video.Video(bvid="BV" + vn[2:])
+
+    try:
+        download_url_data = sync(v.get_download_url(0))
+        detecter = video.VideoDownloadURLDataDetecter(data=download_url_data)
+        streams = detecter.detect_best_streams()
+    except:
+        raise BiliBiliAPIException("Error happens with bilibili-api-python.")
+    if detecter.check_flv_stream() == True:
+        raise BadVideoException("Video is only available in flv format.")
+
+    return streams[1].url