> For the complete documentation index, see [llms.txt](https://docs.decentraland.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.decentraland.org/creator/content-creator-zh/chang-jing-sdk7/mei-ti/audio-streaming.md).

# 音频流

在场景中播放实时音频流。

你可以从 URL 流式播放音频。这适用于直接播放互联网电台的音乐，或将会议流式传输到你的场景中。

{% hint style="info" %}
**💡 提示**：在 [Creator Hub 中的场景编辑器](/creator/content-creator-zh/chang-jing-bian-ji-qi/ru-men/about-editor.md)，你可以使用一个 **音频流** [智能物品](/creator/content-creator-zh/chang-jing-bian-ji-qi/jiao-hu-xing/smart-items.md) 来以无代码方式实现这一点。
{% endhint %}

源中的音频必须采用以下格式之一： `.mp3`, `ogg`，或 `aac`。源还必须是一个 *https* URL（*http* URL 不受支持），并且来源应具有 [CORS 策略（跨源资源共享）](https://en.wikipedia.org/wiki/Cross-origin_resource_sharing) ，并允许外部访问它。如果不是这种情况，你可能需要搭建一个服务器作为代理，以有效的方式公开该流。

{% hint style="warning" %}
**📔 注意**：如果要在你的场景中播放预录音效，请参见 [音效](/creator/content-creator-zh/chang-jing-sdk7/3d-nei-rong-ji-chu/sounds.md).
{% endhint %}

要将音频流添加到你的场景中，只需添加一个 `AudioStream` 组件到实体中：

```ts
const streamEntity = engine.addEntity()

AudioStream.create(streamEntity, {
	url: 'https://icecast.ravepartyradio.org/ravepartyradio-192.mp3',
	playing: true,
	volume: 0.8,
})
```

{% hint style="warning" %}
**📔 注意**：流式播放的声音不是空间化的，它将在整个场景中以恒定音量被听到。如果玩家离开场景，他们将完全听不到该流。
{% endhint %}

设置以下项的音量： `AudioStream` 组件，只需更改其 `volume` 属性定义。

切换 `AudioStream` 组件的开启或关闭状态，只需设置其 `playing` 属性设为 *true* 或 *false*.

{% hint style="info" %}
**📔 注意**：并非所有流媒体服务都允许你在其网站外播放音频。以下是一些可在 Decentraland 中使用的示例：

```ts
DELTA = "https://cdn.instream.audio/:9069/stream?_=171cd6c2b6e"
GRAFFITI = "https://n07.radiojar.com/2qm1fc5kb.m4a?1617129761=&rj-tok=AAABeIR7VqwAilDFeUM39SDjmw&rj-ttl=5"
ISLA NEGRA = "https://radioislanegra.org/listen/up/basic.aac"
```

{% endhint %}

## 流状态

你可以使用以下任一方式监控音频流的状态： `audioEventsSystem` （基于回调，推荐）或通过轮询使用 `AudioStream.getAudioState()`.

### 使用 audioEventsSystem（推荐）

注册一个仅在流状态发生变化时触发的回调。这与以下内容使用的是同一系统： `AudioSource` 实体（参见 [检测声音何时结束](/creator/content-creator-zh/chang-jing-sdk7/3d-nei-rong-ji-chu/sounds.md#detect-when-a-sound-finishes)).

```ts
import { engine, AudioStream, MediaState } from '@dcl/sdk/ecs'
import { audioEventsSystem } from '@dcl/sdk/ecs'

export function main() {
	const entity = engine.addEntity()

	AudioStream.create(entity, {
		playing: true,
		volume: 1,
		url: 'https://audio-edge-es6pf.mia.g.radiomast.io/ref-128k-mp3-stereo',
	})

	audioEventsSystem.registerAudioEventsEntity(entity, (event) => {
		console.log('Stream state: ', event.state)

		if (event.state === MediaState.MS_ERROR) {
			// 尝试重新连接
		}
	})
}
```

### 使用 getAudioState 轮询

你也可以使用以下方法在每一帧轮询流的状态： `AudioStream.getAudioState()`。这会返回一个 `PBAudioEvent` 对象（或 `undefined` 如果尚未报告任何状态），其中包含一个 `state` 字段和一个 `时间戳` 字段。该 `state` 字段的值是 `MediaState` 枚举中使用：

* `MS_NONE`
* `MS_LOADING`
* `MS_READY`
* `MS_PLAYING`
* `MS_PAUSED`
* `MS_BUFFERING`
* `MS_SEEKING`
* `MS_ERROR`

```ts
export function main() {
	const entity = engine.addEntity()

	AudioStream.create(entity, {
		playing: true,
		volume: 1,
		url: 'https://audio-edge-es6pf.mia.g.radiomast.io/ref-128k-mp3-stereo',
	})

	let lastState: MediaState | undefined = undefined
	engine.addSystem(() => {
		const currentState = AudioStream.getAudioState(entity)?.state
		if (lastState !== currentState) {
			console.log('Stream state: ', currentState)
			lastState = currentState

			if (currentState == MediaState.MS_ERROR) {
				// 尝试重新连接
			}
		}
	})
}
```

## 空间音频

默认情况下，来自一个 `AudioStream` 组件的视频是全局的，这意味着在整个场景中都能以一致的音量听到。如果玩家离开场景，他们将完全听不到该流媒体。

要使音频具有空间感，请设置 `spatial` 属性设为 *true*.

```ts
AudioStream.create(entity, {
	url: 'https://radioislanegra.org/listen/up/stream',
    playing: true,
	spatial: true,
})
```

现在，音频将从拥有该 `AudioStream` 组件的实体位置传出，并且玩家越接近它，声音越大。

使用以下属性控制空间音频：

* `spatialMinDistance`：音频开始具有空间感的最小距离。如果玩家更近，音频将以全音量播放。 *0* 。
* `spatialMaxDistance`：音频可被听到的最大距离。如果玩家离得更远，音频音量将为 0。 *60* 默认

```ts
const audioStreamEntity = engine.addEntity();

Transform.create(audioStreamEntity, {
    position: Vector3.create(8, 0, 8),
});

AudioStream.create(audioStreamEntity, {
    url: 'https://radioislanegra.org/listen/up/stream',
    playing: true,
    volume: 1.0,
    spatial: true,
    spatialMinDistance: 5,
    spatialMaxDistance: 10
});
```

{% hint style="warning" %}
**📔 注意**：某些音频格式不支持空间音频。请确保流音频编码为 *mp3*, *AAC-LC* 或 *FLAC*.
{% endhint %}

## 音频分析

你可以从一个 `AudioStream` 实体中读取实时振幅和频率数据，以驱动均衡器或节拍脉冲灯等响应式视觉效果。参见 [音频分析](/creator/content-creator-zh/chang-jing-sdk7/mei-ti/audio-analysis.md).


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