SMTC Bridge

SMTC Bridge was designed to expose Windows System Media Transport Controls (SMTC) as a clean REST API.

This lightweight system tray application allows evelopers can easily create their own "Now Playing" widgets that work with anything supported by SMTC, bypassing the complex API limitations imposed by streaming platforms (fuck you Spotify).

Simply open run the application, and a local web server will run in the background, accessible via http://127.0.0.1:5000/now-playing/

Quick Start

1. Download the latest .exe from the Releases page.
2. Run the application — a tray icon will appear.
3. Right-click the icon to view the API.

Endpoints

Method	Endpoint	Description
GET	/now-playing	Returns the current media state as JSON.
GET	/sessions	Returns a list of all active media sessions.

Schema

The /now-playing endpoint provides a real-time snapshot of your active media sessions. Developers can integrate this into their own web widgets using the following JSON structure:

{
  "app_version": "string",
  "current_session_id": "string",
  "sessions": [
    {
      "source_app_id": "string",
      "media_properties": {
        "Title": "string",
        "Artist": "string",
        "AlbumTitle": "string",
        "AlbumArtist": "string",
        "Thumbnail": "string (base64)",
        "AlbumTrackCount": "integer",
        "TrackNumber": "integer",
        "Genres": "array of strings",
        "Subtitle": "string"
      },
      "playback_info": {
        "PlaybackStatus": "integer",
        "PlaybackType": "integer",
        "PlaybackRate": "number or null",
        "IsShuffleActive": "boolean",
        "AutoRepeatMode": "integer"
      },
      "timeline_properties": {
        "Position": "integer (ms)",
        "StartTime": "integer (ms)",
        "EndTime": "integer (ms)",
        "MinSeekTime": "integer (ms)",
        "MaxSeekTime": "integer (ms)",
        "LastUpdatedTime": "string (ISO 8601)"
      }
    }
  ]
}

Enums

Playback Status

Value	Status	Description
0	CLOSED	Engine uninitialized or empty
1	OPENED	Pipeline loaded but idling
2	CHANGING	Buffering, track skipping, or seeking
3	STOPPED	Track queued but fully stopped
4	PLAYING	Audio actively streaming
5	PAUSED	Audio frozen

Playback Type

Value	Type	Description
0	UNKNOWN	Generic audio wrapper
1	MUSIC	Pure audio pipeline (Spotify, iTunes, etc.)
2	VIDEO	Visual media feed (YouTube, Twitch, etc.)
3	IMAGE	Static slideshow presentation hook

Auto Repeat Mode

Value	Mode	Description
0	NONE	Plays queue through and terminates
1	TRACK	Single active song looping
2	LIST	Parent playlist/album looping

Credits

Built and maintained by nutty. Check out my other stream widgets here!