412 lines
17 KiB
Markdown
412 lines
17 KiB
Markdown
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# 视频播放器示例
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<cite>
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**本文档引用的文件**
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- [video-player.js](file://client/public/videoplayer/js/video-player.js)
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- [gamepadEvents.js](file://client/public/videoplayer/js/gamepadEvents.js)
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- [register-events.js](file://client/public/videoplayer/js/register-events.js)
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- [main.js](file://client/public/videoplayer/js/main.js)
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- [index.html](file://client/public/videoplayer/index.html)
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- [peer.js](file://client/src/peer.js)
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- [signaling.js](file://client/src/signaling.js)
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- [renderstreaming.js](file://client/src/renderstreaming.js)
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- [sender.js](file://client/src/sender.js)
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- [inputdevice.js](file://client/src/inputdevice.js)
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- [inputremoting.js](file://client/src/inputremoting.js)
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- [logger.js](file://client/src/logger.js)
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- [keymap.js](file://client/src/keymap.js)
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- [mousebutton.js](file://client/src/mousebutton.js)
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- [gamepadbutton.js](file://client/src/gamepadbutton.js)
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</cite>
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## 目录
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1. [简介](#简介)
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2. [项目结构](#项目结构)
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3. [核心组件](#核心组件)
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4. [架构总览](#架构总览)
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5. [详细组件分析](#详细组件分析)
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6. [依赖关系分析](#依赖关系分析)
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7. [性能考虑](#性能考虑)
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8. [故障排除指南](#故障排除指南)
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9. [结论](#结论)
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10. [附录](#附录)
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## 简介
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本示例演示了如何在浏览器中接收 Unity 渲染的相机图像，并通过浏览器端操作 Unity 中的相机。系统采用 WebRTC 进行媒体流传输，同时通过数据通道发送用户输入事件（键盘、鼠标、触摸、游戏手柄）。播放器支持主画中画双路视频切换、缩放与坐标转换、以及多种输入设备的实时控制。
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## 项目结构
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视频播放器示例位于 Public 模式下的 videoplayer 子目录，主要由以下层次组成：
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- 视频播放层：负责建立 WebRTC 连接、接收媒体轨道、管理数据通道、处理来自 Unity 的控制消息。
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- 事件注册层：封装各类输入事件的监听与打包，统一通过数据通道发送至 Unity。
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- WebRTC 基础层：封装 PeerConnection、信令协议、ICE 候选等底层细节。
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- 输入设备抽象层：定义输入设备、状态与事件的数据格式，便于序列化与跨平台传输。
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```mermaid
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graph TB
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subgraph "浏览器前端"
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VP["VideoPlayer<br/>视频播放器"]
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RE["register-events.js<br/>事件注册"]
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GP["gamepadEvents.js<br/>游戏手柄事件"]
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PEER["Peer<br/>RTCPeerConnection封装"]
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SIG["Signaling/WebSocketSignaling<br/>信令"]
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end
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subgraph "Unity 后端"
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RS["RenderStreaming<br/>渲染流封装"]
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SENDER["Sender<br/>输入发送器"]
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INPUTDEV["InputDevice/IInputState<br/>输入设备与状态"]
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end
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VP --> PEER
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VP --> SIG
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RE --> VP
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GP --> RE
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PEER --> SIG
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RS --> PEER
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SENDER --> RS
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INPUTDEV --> SENDER
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```
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**图表来源**
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- [video-player.js:18-247](file://client/public/videoplayer/js/video-player.js#L18-L247)
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- [register-events.js:1-308](file://client/public/videoplayer/js/register-events.js#L1-L308)
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- [gamepadEvents.js:1-147](file://client/public/videoplayer/js/gamepadEvents.js#L1-L147)
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- [peer.js:1-188](file://client/src/peer.js#L1-L188)
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- [signaling.js:1-292](file://client/src/signaling.js#L1-L292)
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- [renderstreaming.js:1-317](file://client/src/renderstreaming.js#L1-L317)
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- [sender.js:1-209](file://client/src/sender.js#L1-L209)
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- [inputdevice.js:1-719](file://client/src/inputdevice.js#L1-L719)
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**章节来源**
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- [index.html:1-38](file://client/public/videoplayer/index.html#L1-L38)
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- [main.js:1-157](file://client/public/videoplayer/js/main.js#L1-L157)
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## 核心组件
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- VideoPlayer：负责创建 RTCPeerConnection、订阅媒体轨道、管理数据通道、解析来自 Unity 的控制消息（如切换视频源）。
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- register-events.js：集中注册键盘、鼠标、触摸、游戏手柄事件，将事件打包为二进制消息并通过数据通道发送。
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- gamepadEvents.js：对原生游戏手柄 API 进行封装，生成统一的自定义事件（按钮按下/抬起/持续按住、轴值变化），并维护设备状态。
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- Peer：封装 RTCPeerConnection 生命周期、SDP 协商、ICE 候选处理与断线检测。
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- Signaling/WebSocketSignaling：HTTP 轮询或 WebSocket 实现的信令通道，承载 offer/answer/candidate/on-message 等信令。
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- RenderStreaming/Sender/InputDevice：输入遥测链路的完整实现，定义输入设备、状态与事件的内存布局，支持鼠标、键盘、触摸、游戏手柄。
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**章节来源**
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- [video-player.js:18-247](file://client/public/videoplayer/js/video-player.js#L18-L247)
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- [register-events.js:1-308](file://client/public/videoplayer/js/register-events.js#L1-L308)
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- [gamepadEvents.js:1-147](file://client/public/videoplayer/js/gamepadEvents.js#L1-L147)
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- [peer.js:1-188](file://client/src/peer.js#L1-L188)
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- [signaling.js:1-292](file://client/src/signaling.js#L1-L292)
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- [renderstreaming.js:1-317](file://client/src/renderstreaming.js#L1-L317)
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- [sender.js:1-209](file://client/src/sender.js#L1-L209)
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- [inputdevice.js:1-719](file://client/src/inputdevice.js#L1-L719)
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## 架构总览
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系统采用“浏览器播放器 + 信令 + WebRTC + 数据通道”的架构。浏览器端通过 Signaling 与服务器建立连接，协商 SDP 并交换 ICE 候选；媒体轨道通过 RTCPeerConnection 接收，数据通道用于传输输入事件。Unity 侧通过 RenderStreaming/Sender 将输入事件投递到远程渲染环境，同时可向浏览器发送控制消息（如切换视频源）。
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```mermaid
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sequenceDiagram
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participant Browser as "浏览器"
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participant VP as "VideoPlayer"
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participant PEER as "Peer"
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participant SIG as "Signaling/WebSocketSignaling"
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participant Unity as "Unity"
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Browser->>VP : 初始化并调用 setupConnection()
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VP->>SIG : start() 启动信令
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VP->>PEER : 创建 RTCPeerConnection
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PEER->>SIG : 发送 offer
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SIG-->>PEER : 下发 offer
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PEER->>SIG : 发送 answer
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SIG-->>PEER : 下发 answer
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PEER->>SIG : 发送 ICE 候选
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SIG-->>PEER : 下发 ICE 候选
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PEER-->>VP : 触发 ontrack 获取媒体轨道
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VP->>VP : 切换主/副视频轨道
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Unity-->>VP : 数据通道下发控制消息
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VP->>VP : 解析消息并执行操作
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```
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**图表来源**
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- [video-player.js:49-155](file://client/public/videoplayer/js/video-player.js#L49-L155)
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- [peer.js:57-173](file://client/src/peer.js#L57-L173)
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- [signaling.js:30-149](file://client/src/signaling.js#L30-L149)
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## 详细组件分析
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### VideoPlayer 组件分析
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VideoPlayer 是播放器的核心，负责：
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- 建立 RTCPeerConnection 并绑定事件（trackevent、sendoffer、sendanswer、sendcandidate）。
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- 订阅媒体轨道，维护主/副视频轨道列表，支持动态切换。
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- 创建数据通道，接收来自 Unity 的控制消息并执行相应操作（如切换视频源）。
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- 提供尺寸与坐标转换能力，确保输入事件映射到正确的视频区域。
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```mermaid
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classDiagram
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class VideoPlayer {
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+constructor(elements)
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+setupConnection(useWebSocket)
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+resizeVideo()
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+switchVideo(indexVideoTrack)
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+replaceTrack(stream, newTrack)
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+sendMsg(msg)
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+stop()
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+ondisconnect
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+videoWidth
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+videoHeight
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+videoOriginX
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+videoOriginY
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+videoScale
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}
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class Peer {
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+addEventListener(event, handler)
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+createDataChannel(connectionId, label)
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+onGotDescription(connectionId, description)
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+onGotCandidate(connectionId, candidate)
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+close()
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}
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class Signaling {
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+start()
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+sendOffer(connectionId, sdp)
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+sendAnswer(connectionId, sdp)
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+sendCandidate(connectionId, candidate, sdpMid, sdpMLineIndex)
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+addEventListener(event, handler)
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+stop()
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}
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VideoPlayer --> Peer : "使用"
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VideoPlayer --> Signaling : "使用"
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```
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**图表来源**
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- [video-player.js:18-247](file://client/public/videoplayer/js/video-player.js#L18-L247)
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- [peer.js:1-188](file://client/src/peer.js#L1-L188)
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- [signaling.js:1-292](file://client/src/signaling.js#L1-L292)
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**章节来源**
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- [video-player.js:18-247](file://client/public/videoplayer/js/video-player.js#L18-L247)
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### register-events.js 事件注册与处理
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该模块负责：
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- 键盘事件：按键按下/抬起，映射键码并发送二进制消息。
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- 鼠标事件：点击/移动/滚轮，计算相对于视频的坐标并发送。
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- 触摸事件：多点触控，记录每个触点的阶段、坐标、压力等信息。
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- 游戏手柄事件：统一的按钮与轴事件，生成自定义事件并转发给 VideoPlayer。
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```mermaid
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flowchart TD
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Start(["开始"]) --> Detect["检测输入事件类型"]
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Detect --> |键盘| BuildKey["构建键盘消息<br/>类型/方向/重复/键码/字符"]
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Detect --> |鼠标| BuildMouse["构建鼠标消息<br/>坐标/按钮"]
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Detect --> |触摸| BuildTouch["构建触摸消息<br/>触点数量/阶段/坐标/压力"]
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Detect --> |游戏手柄| BuildGP["构建手柄消息<br/>按钮/轴值"]
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BuildKey --> Send["通过数据通道发送"]
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BuildMouse --> Send
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BuildTouch --> Send
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BuildGP --> Send
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Send --> End(["结束"])
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```
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**图表来源**
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- [register-events.js:120-281](file://client/public/videoplayer/js/register-events.js#L120-L281)
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**章节来源**
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- [register-events.js:1-308](file://client/public/videoplayer/js/register-events.js#L1-L308)
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### gamepadEvents.js 游戏手柄事件处理
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该模块对原生游戏手柄 API 进行封装：
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- 维护设备连接时间戳与前一帧状态，避免重复触发。
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- 定时循环（约 60fps）扫描按钮与轴值变化，生成统一的自定义事件。
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- 支持不同浏览器差异（如 getGamepads 的兼容性）。
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```mermaid
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sequenceDiagram
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participant Browser as "浏览器"
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participant GPH as "gamepadEvents.js"
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participant RE as "register-events.js"
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participant VP as "VideoPlayer"
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Browser->>GPH : 设备连接/断开
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GPH->>GPH : 记录连接时间戳/初始化状态
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loop 60fps
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GPH->>GPH : 扫描按钮/轴值变化
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alt 按钮状态变化
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GPH-->>RE : 触发 gamepadButtonDown/gamepadButtonUp
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else 按钮持续按住
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GPH-->>RE : 触发 gamepadButtonPressed
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end
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alt 轴值变化
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GPH-->>RE : 触发 gamepadAxis
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end
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end
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RE->>VP : sendMsg(二进制消息)
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```
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**图表来源**
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- [gamepadEvents.js:68-94](file://client/public/videoplayer/js/gamepadEvents.js#L68-L94)
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- [register-events.js:42-101](file://client/public/videoplayer/js/register-events.js#L42-L101)
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- [video-player.js:215-233](file://client/public/videoplayer/js/video-player.js#L215-L233)
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**章节来源**
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- [gamepadEvents.js:1-147](file://client/public/videoplayer/js/gamepadEvents.js#L1-L147)
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- [register-events.js:42-101](file://client/public/videoplayer/js/register-events.js#L42-L101)
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### 输入设备抽象与序列化
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输入设备层定义了统一的状态与事件格式，便于跨平台传输：
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- InputDevice：抽象基类，维护设备描述与当前状态。
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- IInputState：抽象状态接口，提供 buffer 与 format 字段。
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- 具体设备状态：MouseState、KeyboardState、TouchscreenState、GamepadState。
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- 事件封装：StateEvent、TextEvent，支持二进制序列化。
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```mermaid
|
|||
|
|
classDiagram
|
|||
|
|
class InputDevice {
|
|||
|
|
+name
|
|||
|
|
+layout
|
|||
|
|
+deviceId
|
|||
|
|
+usages
|
|||
|
|
+description
|
|||
|
|
+updateState(state)
|
|||
|
|
+queueEvent(event)
|
|||
|
|
+currentState
|
|||
|
|
}
|
|||
|
|
class IInputState {
|
|||
|
|
+buffer
|
|||
|
|
+format
|
|||
|
|
}
|
|||
|
|
class MouseState
|
|||
|
|
class KeyboardState
|
|||
|
|
class TouchscreenState
|
|||
|
|
class GamepadState
|
|||
|
|
class StateEvent
|
|||
|
|
class TextEvent
|
|||
|
|
InputDevice <|-- Mouse
|
|||
|
|
InputDevice <|-- Keyboard
|
|||
|
|
InputDevice <|-- Touchscreen
|
|||
|
|
InputDevice <|-- Gamepad
|
|||
|
|
IInputState <|-- MouseState
|
|||
|
|
IInputState <|-- KeyboardState
|
|||
|
|
IInputState <|-- TouchscreenState
|
|||
|
|
IInputState <|-- GamepadState
|
|||
|
|
StateEvent --> IInputState : "包含状态"
|
|||
|
|
TextEvent --> InputEvent : "包含基础事件"
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
**图表来源**
|
|||
|
|
- [inputdevice.js:40-719](file://client/src/inputdevice.js#L40-L719)
|
|||
|
|
|
|||
|
|
**章节来源**
|
|||
|
|
- [inputdevice.js:1-719](file://client/src/inputdevice.js#L1-L719)
|
|||
|
|
|
|||
|
|
### 信令与 WebRTC 协商
|
|||
|
|
- Signaling：基于 HTTP 的轮询信令，支持 offer/answer/candidate/on-message。
|
|||
|
|
- WebSocketSignaling：基于 WebSocket 的实时信令，支持广播与参与者事件。
|
|||
|
|
- Peer：封装 RTCPeerConnection，自动处理 SDP 协商、ICE 候选、断线检测与重发 offer。
|
|||
|
|
|
|||
|
|
```mermaid
|
|||
|
|
sequenceDiagram
|
|||
|
|
participant A as "Peer A"
|
|||
|
|
participant SIG as "Signaling"
|
|||
|
|
participant B as "Peer B"
|
|||
|
|
A->>SIG : 发送 offer
|
|||
|
|
SIG-->>B : 下发 offer
|
|||
|
|
B->>B : 设置远端 offer
|
|||
|
|
B->>SIG : 发送 answer
|
|||
|
|
SIG-->>A : 下发 answer
|
|||
|
|
A->>A : 设置远端 answer
|
|||
|
|
A->>SIG : 发送 ICE 候选
|
|||
|
|
B->>SIG : 发送 ICE 候选
|
|||
|
|
SIG-->>A : 下发 ICE 候选
|
|||
|
|
SIG-->>B : 下发 ICE 候选
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
**图表来源**
|
|||
|
|
- [peer.js:57-173](file://client/src/peer.js#L57-L173)
|
|||
|
|
- [signaling.js:117-146](file://client/src/signaling.js#L117-L146)
|
|||
|
|
|
|||
|
|
**章节来源**
|
|||
|
|
- [peer.js:1-188](file://client/src/peer.js#L1-L188)
|
|||
|
|
- [signaling.js:1-292](file://client/src/signaling.js#L1-L292)
|
|||
|
|
|
|||
|
|
## 依赖关系分析
|
|||
|
|
- VideoPlayer 依赖 Peer 与 Signaling，用于媒体与信令。
|
|||
|
|
- register-events 依赖 gamepadEvents 与 keymap，用于事件注册与键码映射。
|
|||
|
|
- main.js 作为入口，协调 VideoPlayer 与事件注册模块。
|
|||
|
|
- 输入遥测链路由 Sender -> RenderStreaming -> Peer -> Signaling，最终到达 Unity。
|
|||
|
|
|
|||
|
|
```mermaid
|
|||
|
|
graph LR
|
|||
|
|
MAIN["main.js"] --> VP["video-player.js"]
|
|||
|
|
MAIN --> REG["register-events.js"]
|
|||
|
|
REG --> GPE["gamepadEvents.js"]
|
|||
|
|
VP --> PEER["peer.js"]
|
|||
|
|
VP --> SIG["signaling.js"]
|
|||
|
|
SENDER["sender.js"] --> RS["renderstreaming.js"]
|
|||
|
|
RS --> PEER
|
|||
|
|
INPUTDEV["inputdevice.js"] --> SENDER
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
**图表来源**
|
|||
|
|
- [main.js:1-157](file://client/public/videoplayer/js/main.js#L1-L157)
|
|||
|
|
- [video-player.js:1-247](file://client/public/videoplayer/js/video-player.js#L1-L247)
|
|||
|
|
- [register-events.js:1-308](file://client/public/videoplayer/js/register-events.js#L1-L308)
|
|||
|
|
- [gamepadEvents.js:1-147](file://client/public/videoplayer/js/gamepadEvents.js#L1-L147)
|
|||
|
|
- [peer.js:1-188](file://client/src/peer.js#L1-L188)
|
|||
|
|
- [signaling.js:1-292](file://client/src/signaling.js#L1-L292)
|
|||
|
|
- [sender.js:1-209](file://client/src/sender.js#L1-L209)
|
|||
|
|
- [renderstreaming.js:1-317](file://client/src/renderstreaming.js#L1-L317)
|
|||
|
|
- [inputdevice.js:1-719](file://client/src/inputdevice.js#L1-L719)
|
|||
|
|
|
|||
|
|
**章节来源**
|
|||
|
|
- [main.js:1-157](file://client/public/videoplayer/js/main.js#L1-L157)
|
|||
|
|
|
|||
|
|
## 性能考虑
|
|||
|
|
- 事件采样频率：游戏手柄事件以约 60fps 轮询，建议根据设备刷新率调整间隔，避免过度 CPU 占用。
|
|||
|
|
- 坐标转换：VideoPlayer 提供视频缩放与偏移计算，确保输入事件映射准确，减少误触。
|
|||
|
|
- 数据通道：仅在通道打开时发送消息，避免在关闭或连接中发送导致异常。
|
|||
|
|
- 媒体轨道切换：使用 replaceTrack 替换视频轨道，避免频繁创建/销毁媒体流带来的抖动。
|
|||
|
|
|
|||
|
|
## 故障排除指南
|
|||
|
|
- 无法建立 WebRTC 连接
|
|||
|
|
- 检查信令是否正常启动与停止。
|
|||
|
|
- 确认 offer/answer 协商过程无异常，ICE 候选是否正确交换。
|
|||
|
|
- 查看断线事件与日志输出。
|
|||
|
|
- 数据通道不可用
|
|||
|
|
- 确认数据通道已创建且处于 open 状态。
|
|||
|
|
- 检查 sendMsg 的状态分支，避免在 closing/closed 状态发送。
|
|||
|
|
- 输入事件未生效
|
|||
|
|
- 确认事件监听已注册，且消息格式与 Unity 期望一致。
|
|||
|
|
- 检查坐标转换参数（videoScale、videoOriginX/Y）是否正确。
|
|||
|
|
- 游戏手柄无响应
|
|||
|
|
- 确认浏览器支持 getGamepads 或 webkitGetGamepads。
|
|||
|
|
- 检查设备连接时间戳与状态缓存是否正确初始化。
|
|||
|
|
|
|||
|
|
**章节来源**
|
|||
|
|
- [video-player.js:128-154](file://client/public/videoplayer/js/video-player.js#L128-L154)
|
|||
|
|
- [register-events.js:237-263](file://client/public/videoplayer/js/register-events.js#L237-L263)
|
|||
|
|
- [gamepadEvents.js:112-146](file://client/public/videoplayer/js/gamepadEvents.js#L112-L146)
|
|||
|
|
- [logger.js:1-30](file://client/src/logger.js#L1-L30)
|
|||
|
|
|
|||
|
|
## 结论
|
|||
|
|
该视频播放器示例完整展示了从浏览器接收 Unity 渲染视频、通过数据通道发送用户输入、以及在 Unity 中进行相机控制的端到端流程。其模块化设计使得事件注册、输入抽象与 WebRTC 协商清晰分离，便于扩展与维护。通过合理的坐标转换与事件采样策略，系统在多设备环境下具备良好的交互体验。
|
|||
|
|
|
|||
|
|
## 附录
|
|||
|
|
|
|||
|
|
### 使用指南
|
|||
|
|
- Public 模式配置
|
|||
|
|
- 通过配置接口获取服务器设置，决定使用 HTTP 轮询信令还是 WebSocket 信令。
|
|||
|
|
- 若启动模式为私有模式，页面会显示警告提示。
|
|||
|
|
- 启动播放器
|
|||
|
|
- 点击播放按钮后，页面动态创建主视频与缩略视频元素。
|
|||
|
|
- 初始化 VideoPlayer 并建立 WebRTC 连接。
|
|||
|
|
- 控制 Unity 中的相机
|
|||
|
|
- 通过数据通道发送控制消息（如切换视频源）。
|
|||
|
|
- 可通过按钮事件向 Unity 发送按钮点击消息。
|
|||
|
|
- 输入设备使用
|
|||
|
|
- 键盘：按键按下/抬起事件会被打包发送。
|
|||
|
|
- 鼠标：点击/移动/滚轮事件，坐标经视频缩放与偏移转换。
|
|||
|
|
- 触摸：多点触控，记录触点阶段、坐标、压力等。
|
|||
|
|
- 游戏手柄：按钮与轴值变化统一事件，支持不同浏览器差异。
|
|||
|
|
- 设备适配
|
|||
|
|
- 坐标系适配：VideoPlayer 提供缩放与偏移计算，确保事件映射到正确区域。
|
|||
|
|
- 全屏模式：支持全屏切换，改变按钮可见性与布局。
|
|||
|
|
- 断线处理：断线时清理 DOM、停止播放器并重新显示播放按钮。
|
|||
|
|
|
|||
|
|
**章节来源**
|
|||
|
|
- [main.js:23-157](file://client/public/videoplayer/js/main.js#L23-L157)
|
|||
|
|
- [video-player.js:49-247](file://client/public/videoplayer/js/video-player.js#L49-L247)
|
|||
|
|
- [register-events.js:120-308](file://client/public/videoplayer/js/register-events.js#L120-L308)
|
|||
|
|
- [gamepadEvents.js:112-147](file://client/public/videoplayer/js/gamepadEvents.js#L112-L147)
|