diff --git a/homeassistant/components/media_player/browse_media.py b/homeassistant/components/media_player/browse_media.py
index 6fe4683c1fc..26494e4c8a7 100644
--- a/homeassistant/components/media_player/browse_media.py
+++ b/homeassistant/components/media_player/browse_media.py
@@ -15,7 +15,9 @@ from .const import CONTENT_AUTH_EXPIRY_TIME, MEDIA_CLASS_DIRECTORY
 
 
 @callback
-def async_process_play_media_url(hass: HomeAssistant, media_content_id: str) -> str:
+def async_process_play_media_url(
+    hass: HomeAssistant, media_content_id: str, *, allow_relative_url: bool = False
+) -> str:
     """Update a media URL with authentication if it points at Home Assistant."""
     if media_content_id[0] != "/" and not is_hass_url(hass, media_content_id):
         return media_content_id
@@ -34,8 +36,8 @@ def async_process_play_media_url(hass: HomeAssistant, media_content_id: str) ->
         )
         media_content_id = str(parsed.join(yarl.URL(signed_path)))
 
-    # prepend external URL
-    if media_content_id[0] == "/":
+    # convert relative URL to absolute URL
+    if media_content_id[0] == "/" and not allow_relative_url:
         media_content_id = f"{get_url(hass)}{media_content_id}"
 
     return media_content_id
diff --git a/homeassistant/components/media_source/__init__.py b/homeassistant/components/media_source/__init__.py
index 77b254dcf9d..2bcd80a39ab 100644
--- a/homeassistant/components/media_source/__init__.py
+++ b/homeassistant/components/media_source/__init__.py
@@ -2,21 +2,20 @@
 from __future__ import annotations
 
 from collections.abc import Callable
-import dataclasses
-from datetime import timedelta
 from typing import Any
-from urllib.parse import quote
 
 import voluptuous as vol
 
 from homeassistant.components import frontend, websocket_api
-from homeassistant.components.http.auth import async_sign_path
 from homeassistant.components.media_player import (
     ATTR_MEDIA_CONTENT_ID,
     CONTENT_AUTH_EXPIRY_TIME,
     BrowseError,
     BrowseMedia,
 )
+from homeassistant.components.media_player.browse_media import (
+    async_process_play_media_url,
+)
 from homeassistant.components.websocket_api import ActiveConnection
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.integration_platform import (
@@ -177,13 +176,12 @@ async def websocket_resolve_media(
         connection.send_error(msg["id"], "resolve_media_failed", str(err))
         return
 
-    data = dataclasses.asdict(media)
-
-    if data["url"][0] == "/":
-        data["url"] = async_sign_path(
-            hass,
-            quote(data["url"]),
-            timedelta(seconds=msg["expires"]),
-        )
-
-    connection.send_result(msg["id"], data)
+    connection.send_result(
+        msg["id"],
+        {
+            "url": async_process_play_media_url(
+                hass, media.url, allow_relative_url=True
+            ),
+            "mime_type": media.mime_type,
+        },
+    )
diff --git a/tests/components/media_source/test_init.py b/tests/components/media_source/test_init.py
index 319ef295be3..2655000efc9 100644
--- a/tests/components/media_source/test_init.py
+++ b/tests/components/media_source/test_init.py
@@ -187,7 +187,8 @@ async def test_websocket_resolve_media(hass, hass_ws_client, filename):
     assert msg["id"] == 1
     assert msg["result"]["mime_type"] == media.mime_type
 
-    # Validate url is signed.
+    # Validate url is relative and signed.
+    assert msg["result"]["url"][0] == "/"
     parsed = yarl.URL(msg["result"]["url"])
     assert parsed.path == getattr(media, "url")
     assert "authSig" in parsed.query