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185 lines
3.9 KiB
Markdown
185 lines
3.9 KiB
Markdown
# AudioSource API 文档
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本文档由 `DeepSeek R1` 模型生成并微调。
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---
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## 类描述
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音频系统的源头抽象类，定义了音频播放的核心控制接口。支持多种音频源类型，包括流媒体、HTML 音频元素和静态音频缓冲。
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```mermaid
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graph LR
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AudioPlayer --> EventEmitter
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click EventEmitter "https://nodejs.org/api/events.html#class-eventemitter"
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```
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---
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## 抽象成员说明
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| 成员 | 类型 | 说明 |
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| ------------- | ----------- | ------------------------ |
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| `output` | `AudioNode` | 音频输出节点（必须实现） |
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| `duration` | `number` | 音频总时长（秒） |
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| `currentTime` | `number` | 当前播放时间（秒） |
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| `playing` | `boolean` | 播放状态标识 |
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---
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## 核心方法说明
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### `abstract play`
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```typescript
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function play(when?: number): void;
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```
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启动音频播放时序
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| 参数 | 类型 | 说明 |
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| ---- | -------- | ----------------------------------------------- |
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| when | `number` | 预定播放时间（基于 `AudioContext.currentTime`） |
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---
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### `abstract stop`
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```typescript
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function stop(): number;
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```
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停止播放并返回停止时刻
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---
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### `abstract connect`
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```typescript
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function connect(target: IAudioInput): void;
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```
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连接至音频处理管线
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| 参数 | 类型 | 说明 |
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| ------ | ------------- | ------------------- |
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| target | `IAudioInput` | 下游处理节点/效果器 |
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---
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### `abstract setLoop`
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```typescript
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function setLoop(loop: boolean): void;
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```
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设置循环播放模式
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---
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## 事件系统
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| 事件名 | 参数 | 触发时机 |
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| ------ | ---- | -------------- |
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| `play` | - | 开始播放时 |
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| `end` | - | 自然播放结束时 |
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---
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## 自定义音频源示例
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### 网络实时通话源
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```typescript
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class WebRTCAudioSource extends AudioSource {
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private mediaStream: MediaStreamAudioSourceNode;
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output: AudioNode;
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constructor(ac: AudioContext, stream: MediaStream) {
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super(ac);
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this.mediaStream = ac.createMediaStreamSource(stream);
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this.output = this.mediaStream;
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}
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get duration() {
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return Infinity;
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} // 实时流无固定时长
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get currentTime() {
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return this.ac.currentTime;
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}
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play() {
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this.mediaStream.connect(this.output);
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this.playing = true;
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this.emit('play');
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}
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stop() {
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this.mediaStream.disconnect();
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this.playing = false;
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return this.ac.currentTime;
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}
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connect(target: IAudioInput) {
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this.output.connect(target.input);
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}
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setLoop() {} // 实时流不支持循环
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}
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// 使用示例
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navigator.mediaDevices.getUserMedia({ audio: true }).then(stream => {
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const source = new WebRTCAudioSource(audioContext, stream);
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source.connect(effectsChain);
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source.play();
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});
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```
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---
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## 内置实现说明
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### AudioStreamSource（流媒体源）
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```mermaid
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graph LR
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Network[网络数据流] --> Buffer[缓冲区]
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Buffer --> Decoder[音频解码器]
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Decoder --> Output[实时音频节点]
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```
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- 支持渐进式加载
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- 动态缓冲管理
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- 适用于浏览器自身不支持的音频类型
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### AudioElementSource（HTML 音频元素源）
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```mermaid
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graph LR
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AudioTag[audio 元素] -->|音频流| Output[媒体元素源节点]
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```
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- 基于 HTML5 Audio 元素
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- 支持跨域资源
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- 自动处理音频格式兼容
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### AudioBufferSource（静态音频缓冲源）
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```mermaid
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graph LR
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File[音频文件] --> Decode[解码为 AudioBuffer]
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Decode --> Output[缓冲源节点]
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```
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- 完整音频数据预加载
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- 精确播放控制
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- 支持内存音频播放
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---
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## 注意事项
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1. **时间精度**
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所有时间参数均以 `AudioContext.currentTime` 为基准，精度可达 0.01 秒
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