# Media Item

The LiSA Player communicates key events related to the current media item by dispatching various messages:

* **Creator Join** — Notifies when a creator enters a live stream.
* **Creator Leave** — Notifies when a creator exists a live stream.
* [**Emoji**](/developers/guides/player-communication/message-api-reference/media-item/media-item-emoji.md) — Captures user reactions through emoji interactions.
* [**Impression**](/developers/guides/player-communication/message-api-reference/media-item/media-item-impression.md) — Indicates when a media item has been viewed.

This message is sent by the LiSA Player to the host app / environment.

### Properties

Along with all standard [Message properties](/developers/guides/player-communication/message-api-reference.md#properties), a **Media Item** message includes the following additional properties:

<table><thead><tr><th width="220" valign="top">Name</th><th width="175" valign="top">Type</th><th valign="top">Description</th></tr></thead><tbody><tr><td valign="top"><code>mediaItemId</code></td><td valign="top"><pre><code>string
</code></pre><p>Required.</p></td><td valign="top">The <code>mediaItemId</code> property uniquely identifies the Media Item from which this message originates.</td></tr><tr><td valign="top"><code>mediaItemType</code></td><td valign="top"><pre><code>MediaItemType
</code></pre><p>Required.</p></td><td valign="top">The <code>mediaItemType</code> property specifies the type of Media Item from which this message originates.<br><br>Refer to <a href="/pages/TzMvWg0wtnzBMpFfvyoN#media-item-type"><code>MediaItemType</code></a> for detailed information.</td></tr><tr><td valign="top"><code>messageType</code></td><td valign="top"><pre><code>Literal
</code></pre><p>Required.</p></td><td valign="top">The <code>messageType</code> property specifies the distinct type of message.</td></tr><tr><td valign="top"><code>progress</code></td><td valign="top"><pre><code>MediaProgress
</code></pre><p>Required.</p></td><td valign="top">The <code>progress</code> property is an object that holds additional metadata related to the media playback progress of the current media item.<br><br>Please refer to <a href="/pages/rMD8D7mCXjBlgew5J7ms#media-progress"><code>MediaProgress</code></a> for detailed information.</td></tr></tbody></table>

***

### Type Definition

```typescript
interface MediaItemMessage extends Omit<
  Message,
  'messageType' | 'sender'
> {

  mediaItemId: string;
  mediaItemType: MediaItemType;
  messageType:
    | 'lsc:media:creator:join'
    | 'lsc:media:creator:leave'
    | 'lsc:media:emoji'
    | 'lsc:media:impression';
  progress: MediaProgress;
  sender: 'LiSA';
}
```

### Type Definitions

#### Media Item Type

The `MediaItemType` property is an enum that defines the type of media item. It helps differentiate between live content, recorded replays, and short-form media.

* `live` – A real-time live stream with an undefined duration (`durationInMs = -1`).
* `replay` – A recorded playback of a previous live stream with a fixed duration.
* `story` – A short-form media item, typically with a defined duration and limited availability.

<pre class="language-typescript"><code class="lang-typescript"><strong>type MediaItemType = 'live' | 'replay' | 'story';
</strong></code></pre>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.hello-lisa.com/developers/guides/player-communication/message-api-reference/media-item.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.