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Apache-2.0

castengine_wifi_display

简介

castengine_wifi_display部件别名Sharing,媒体分享之意。拥有流媒体协议接入、媒体预览、媒体转分发能力,受投播管理服务管理和调用,是音视频投播子系统重要的流媒体能力部件。提供一套简单的Native C++的接口,主要业务是Miracast投屏,提供以下常用功能:

  • 主投端(WFD Source):主投端发送器,用于投屏Source端业务,可发送多路屏幕镜像流到不同设备。

  • 被投端(WFD Sink):被投端接收器,用于投屏Sink端业务,可接收多个设备的投屏流。

逻辑架构

模块职责

模块名称 职责
Interaction 框架层交互模块,负责与外部进程进行交互,基于IPC与RPC机制用于实现设备内和设备间的跨进程通信,支持与多个进程并发交互。
Scene 交互模块的业务实现部分,和Interaction实例共同完成对外交互和对内框架调用。
ContextMgr 框架层业务容器模块,负责将不同的业务Agent关联在一起,用于实现收流,转发,发流等业务;每个业务容器实例可包含多个Agent。
Agent 业务在框架层的代理对象,负责信令层的交互。Agent分为Sink端Agent和Src端Agent。其中,Sink Agent负责收流(获取媒体数据)业务,Src Agent负责发流(输出媒体数据)业务。
Session 业务控制层的具体实现,和Agent对象共同完成业务的信令交互。
Configuration 配置管理模块,设置框架和业务的配置数据,服务启动时加载。
EventScheduler 事件分发调度管理器,集中分发处理模块上报事件,采用异步线程池方式处理,不处理磁盘IO和网络IO等耗时操作。
MediachannelMgr 框架层媒体通道模块,管理媒体通道,每个媒体通道实例可实现媒体数据的接入、预览和发送;具备编解码能力、混流能力、流媒体数据包透传能力;
Consumer 获取媒体数据对象,可根据业务属性通过任何方式获取媒体数据,通常用于收流。
Producer 输出媒体数据对象,可根据业务属性通过任何方式输出媒体数据,通常用于推流。
ServiceMgr 框架层服务管理模块,服务监听的管理模块,每个service实例用于对指定的端口进行tcp或者udp监听,可与外部进程或设备进行数据交互。
InputBack 反控模块,跨设备反控及坐标变化等处理。
WindowMgr 框架层窗口管理模块,窗口实例用于自触发预览窗口时使用。
Protocol 实现rtsp、rtp、wfd、dlna、uibc等协议封装,用于对外协议交互与对接。
Codec 媒体数据的封装与解封装,编码与解码,硬解加速等。
Network 网络协议封装,包括tcp/udp的服务端、客户端等。

目录结构

仓目录结构如下:

/foundation/CastEngine/castengine_wifi_display  # 投播部件业务代码
├── figures                               # 
├── interfaces                            # 外部接口层
│   ├── kits                              # 应用接口
│   └── innerkits                         # 系统内部件接口
├── frameworks                            # 部件无独立进程的实现
│   └── innerkitsimpl                     # native c++实现
├── sa_profile                            # 部件配置
├── services                              # 服务C/S实现
│   ├── interaction                       # 进程交互
│   ├── configure                         # 配置管理
│   ├── context                           # 业务容器
│   ├── agent                             # 业务代理
│   ├── mediachannel                      # 媒体通道
│   ├── mediaplayer                       # 播放渲染
│   ├── etc                               # 部件进程配置
│   ├── event                             # 事件中心
│   ├── impl                              # 业务实现
│   │   └── wfd                           # WFD业务实现
│   ├── inputback                         # 反控模块
│   ├── scheduler                         # 调度中心
│   ├── windowmgr                         # 窗口管理
│   ├── protocol                          # 协议库
│   ├── codec                             # 编解码库
│   ├── network                           # 网络库
│   ├── extend                            # 引入库
│   ├── common                            # 公共类
│   └── utils                             # 工具类
├── sa_profile                            # 服务配置                        
├── tests                                 # 测试代码
├── bundle.json                           # 部件描述文件
└── BUILD.gn                              # 编译入口

目录结构

WFD Sink作为被投端允许多个设备同时投屏。投播框架允许单独操控每路投屏的音频,因此在多路投屏时可自由选择音频的播放与静音;WFD Source 可投屏到多个Sink端。设备作为Sink端时不能再作为Source端,反之亦然。

相关仓

castengine_cast_framework

castengine_cast_plus_stream

castengine_dlna

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简介

castengine_wifi_display部件别名Sharing,媒体分享之意。基于投播框架开发,拥有流媒体协议接入、媒体预览、媒体转分发等通用能力,受投播管理服务框架管理和调用,提供Miracast镜像投屏能力,是音视频投播子系统重要的流媒体能力部件。 展开 收起
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