# 初始化 (/zh-CN/api-reference/rtc/electron/play/mediaplayer/mediaplayer-initialize)

> For AI agents: see the complete documentation index at [llms.txt](/llms.txt).

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## addListener [#addlistener]

添加一个 [IMediaPlayerEvent](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayerevent) 监听器。

<a id="api_imediaplayer_addlistener_imediaplayer__prototype"></a>

```ts
addListener?<EventType extends keyof IMediaPlayerEvent>(
      eventType: EventType,
      listener: IMediaPlayerEvent[EventType]
    ): void;
```

<a id="api_imediaplayer_addlistener_imediaplayer__detailed_desc"></a>

成功调用该方法后，你可以通过 [IMediaPlayerEvent](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayerevent) 监听对应 [IMediaPlayer](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayer) 对象的事件、获取数据。根据业务需要，你可以为同一事件添加多个监听器。

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### 参数 [#参数]

<ParameterList>
<a id="eventtype"></a>
<Parameter name="eventType">

需要监听的目标事件名。详见 [IMediaPlayerEvent](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayerevent)。

</Parameter>
<a id="listener"></a>
<Parameter name="listener">

`eventType` 对应的回调函数。以添加 [onPlayerSourceStateChanged](/zh-CN/api-reference/rtc/electron/play/mediaplayer/mediaplayer-observer#callback_imediaplayersourceobserver_onplayersourcestatechanged) 为例：

```text
const onPlayerSourceStateChanged = (connection: RtcConnection, elapsed: number) => {};
engine.addListener('onPlayerSourceStateChanged', onPlayerSourceStateChanged);
```

</Parameter>
</ParameterList>

### 所属接口类 [#所属接口类]

- [IMediaPlayer](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayer)

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## createMediaPlayer [#createmediaplayer]

创建媒体播放器对象。

<a id="api_irtcengine_createmediaplayer__prototype"></a>

```ts
abstract createMediaPlayer(): IMediaPlayer;
```

<a id="api_irtcengine_createmediaplayer__detailed_desc"></a>

在调用 [IMediaPlayer](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayer) 类下的其他 API 前，你需要先调用该方法创建一个媒体播放器实例。如果你需要创建多个实例，可以多次调用该方法。

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### 调用时机 [#调用时机]

该方法在加入频道前后均可调用。

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### 参数 [#参数-1]

<ParameterList>
<a id="delegate"></a>
<Parameter name="delegate">

[IRtcEngine](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_irtcengine) 的事件句柄，详见 [IRtcEngineEventHandler](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_irtcengineeventhandler)。

</Parameter>
</ParameterList>

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### 返回值 [#返回值]

- 方法调用成功：返回 [IMediaPlayer](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayer) 对象。
- 方法调用失败：返回空指针。

### 所属接口类 [#所属接口类-1]

- [IRtcEngine](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_irtcengine)

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## destroyMediaPlayer [#destroymediaplayer]

销毁媒体播放器。

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```ts
abstract destroyMediaPlayer(mediaPlayer: IMediaPlayer): number;
```

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### 参数 [#参数-2]

<ParameterList>
<a id="mediaplayer"></a>
<Parameter name="mediaPlayer">

[IMediaPlayer](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayer) 对象。

</Parameter>
</ParameterList>

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### 返回值 [#返回值-1]

- ≥ 0: 方法调用成功，返回媒体播放器 ID
- &lt; 0: 方法调用失败。详见[错误码](/zh-CN/api-reference/rtc/error-code)了解详情和解决建议。

### 所属接口类 [#所属接口类-2]

- [IRtcEngine](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_irtcengine)

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## getMediaPlayerCacheManager [#getmediaplayercachemanager]

获取 [IMediaPlayerCacheManager](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayercachemanager) 实例。

<a id="api_imediaplayercachemanager_getmediaplayercachemanager__prototype"></a>

```ts
export function getMediaPlayerCacheManager(): IMediaPlayerCacheManager {
  return new IMediaPlayerCacheManagerImpl();
}
```

<a id="api_imediaplayercachemanager_getmediaplayercachemanager__detailed_desc"></a>

在调用 [IMediaPlayerCacheManager](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayercachemanager) 类下的其他 API 前，你需要先调用该方法获取一个媒体播放器缓存管理器的实例。

:::note
注： 由于媒体播放器缓存管理器对象是单例模式，因此多次调用该方法将返回同一个实例。
:::

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### 调用时机 [#调用时机-1]

请在初始化 [IRtcEngine](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_irtcengine) 后调用该方法。

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### 返回值 [#返回值-2]

[IMediaPlayerCacheManager](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayercachemanager) 实例。

### 所属接口类 [#所属接口类-3]

- [IMediaPlayerCacheManager](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayercachemanager)

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## removeAllListeners [#removealllisteners]

移除指定事件的所有监听器。

<a id="api_imediaplayer_removealllisteners_imediaplayer__prototype"></a>

```ts
removeAllListeners?<EventType extends keyof IMediaPlayerEvent>(
      eventType?: EventType
    ): void;
```

<a id="api_imediaplayer_removealllisteners_imediaplayer__detailed_desc"></a>

<a id="api_imediaplayer_removealllisteners_imediaplayer__parameters"></a>

### 参数 [#参数-3]

<ParameterList>
<a id="eventtype-1"></a>
<Parameter name="eventType">

需要监听的目标事件名。详见 [IMediaPlayerEvent](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayerevent)。

</Parameter>
</ParameterList>

### 所属接口类 [#所属接口类-4]

- [IMediaPlayer](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayer)

<a id="api_imediaplayer_removelistener_imediaplayer"></a>

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## removeListener [#removelistener]

移除指定的 [IMediaPlayerEvent](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayerevent) 监听器。

<a id="api_imediaplayer_removelistener_imediaplayer__prototype"></a>

```ts
removeListener?<EventType extends keyof IMediaPlayerEvent>(
      eventType: EventType,
      listener: IMediaPlayerEvent[EventType]
    ): void;
```

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<a id="api_imediaplayer_removelistener_imediaplayer__parameters"></a>

### 参数 [#参数-4]

<ParameterList>
<a id="eventtype-2"></a>
<Parameter name="eventType">

需要监听的目标事件名。详见 [IMediaPlayerEvent](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayerevent)。

</Parameter>
<a id="listener-1"></a>
<Parameter name="listener">

`eventType` 对应的回调函数。必须传入 [addListener](/zh-CN/api-reference/rtc/electron/play/mediaplayer/mediaplayer-initialize#api_imediaplayer_addlistener_imediaplayer) 中传入的同一个函数对象。以取消监听 [onPlayerSourceStateChanged](/zh-CN/api-reference/rtc/electron/play/mediaplayer/mediaplayer-observer#callback_imediaplayersourceobserver_onplayersourcestatechanged) 为例：

```text
const onPlayerSourceStateChanged = (state: MediaPlayerState, ec: MediaPlayerError) => {};
engine.addListener('onPlayerSourceStateChanged', onPlayerSourceStateChanged);
engine.removeListener('onPlayerSourceStateChanged', onPlayerSourceStateChanged);
```

</Parameter>
</ParameterList>

### 所属接口类 [#所属接口类-5]

- [IMediaPlayer](/zh-CN/api-reference/rtc/electron/rtc-interface-class#class_imediaplayer)