fix: allow returning DASH manifest in get_file_url

If a track's manifest is not a JSON object but a DASH manifest,
get_file_url throws.
This fix encodes the DASH manifest in a data: URI to allow compatible
players to play the track regardless.
This is technically not a URL, but compatible players usually don't
mind.

Author: TpmKranz

tidal_async/api.py

@@ -282,10 +282,6 @@ async def _playbackinfopostpaywall(self, preferred_audio_quality) -> dict:
 
         return await resp.json()
 
-    async def _stream_manifest(self, preferred_audio_quality):
-        data = await self._playbackinfopostpaywall(preferred_audio_quality)
-        return json.loads(base64.b64decode(data["manifest"])), data
-
     async def get_file_url(
         self,
         required_quality: Optional[AudioQuality] = None,
@@ -307,12 +303,16 @@ async def get_file_url(
         if required_quality is None:
             required_quality = self.sess.required_audio_quality
 
-        manifest, playback_info = await self._stream_manifest(preferred_quality)
+        playback_info = await self._playbackinfopostpaywall(preferred_quality)
         quality = AudioQuality(playback_info["audioQuality"])
 
         if quality < required_quality:
             raise InsufficientAudioQuality(f"Got {quality} for {self}, required audio quality is {required_quality}")
 
+        try:
+            manifest = json.loads(base64.b64decode(playback_info["manifest"]))
+        except json.decoder.JSONDecodeError:
+            return f'data:application/dash+xml;base64,{playback_info["manifest"]}'
         return manifest["urls"][0]
 
     async def _lyrics(self) -> Optional[dict]: