TypeType Player

The browser MSE and SABR playback engine for TypeType.

TypeType-Player is the TypeScript package that turns TypeType playback sessions into audio and video on an HTMLVideoElement. It owns the Media Source Extensions pipeline and leaves controls and page layout to the consuming application.

The TypeType web client uses this package through TypeType-Frontend. The playback-session API is provided by TypeType-Server.

• Load TypeType SABR manifests and initialization segments
• Select exact video, audio, and audio-track formats
• Schedule and append media segments through MSE
• Coordinate startup, buffering, seeking, quality changes, and audio-only mode
• Bound forward and back buffers
• Recover from stale requests, interrupted fetches, and expired sessions
• Expose playback events and runtime snapshots to the consuming interface

The package contains no user interface and has no runtime dependencies.

From npm:

npm install @typetype/mse

From JSR:

bunx jsr add @typetype/mse

import { TypeTypeMsePlayer } from "@typetype/mse";

const engine = new TypeTypeMsePlayer(videoElement, {
  endpoint: "/api",
  videoId: "VIDEO_ID",
  videoItag: 137,
  audioItag: 140,
  audioTrackId: null,
  startTimeMs: 0,
  headers: {
    Authorization: `Bearer ${token}`,
  },
});

engine.on("state", (event) => console.log(event.state));
await engine.load();
await engine.play();

await engine.setQuality({ videoItag: 248 });
await engine.setAudioOnly(true);

Inspect the current runtime state with:

const snapshot = engine.snapshot();

Always call destroy() when the player is no longer used.

Requirements:

• Bun 1.3.14
• Deno 2.9.2 for JSR and documentation validation

bun install --frozen-lockfile
bun run check
bun run check:docs
bun run check:jsr
bun run test:coverage
bun run build

Releases are published to npm and JSR from version tags through trusted publishing.

Read CONTRIBUTING.md before opening a pull request. Bug reports and feature requests belong in the central issue tracker.

TypeType-Player is licensed under the MIT License.