WEBRTC 媒体引擎MediaEngine

来源：互联网发布：java输入输出流缓冲区编辑：程序博客网时间：2024/06/05 11:18

WEBRTC 媒体引擎包括音频引擎和视频引擎

音频引擎包括采集处理编码传输处理解码

视频音频包括采集处理编码传输处理解码

视频采集流程

一.创建VideoCapturer
1.创建VideoCaptureFactory::CreateDeviceInfo
2.查询采集设备
GetDeviceName
3. 通过工厂方法创建VideoCapturer,WebRtcVideoDeviceCapturerFactory::Create(name)->new WebRtcVideoCapturer->
new WebRtcVcmFactory->WebRtcVideoCapturer::Init->WebRtcVcmFactoryInterface::Create[创建具体VideoCaptureModule]

二.启动VideoCapturer
PeerConnectionFactory::CreateVideoSource(cricket::VideoCapturer* capturer)->
VideoCapturerTrackSource::Create[new VideoCapturerTrackSource传入VideoCapturer对象]->
VideoCapturerTrackSource::Initialize->VideoCapturer::StartCapturing->WebRtcVideoCapturer::Start->
VideoCaptureImpl::RegisterCaptureDataCallback[注册接收采集回调对象 WebRtcVideoCapturer::OnIncomingCapturedFrame回调给用户]->

VideoCaptureModuleV4L2[继承VideoCaptureImpl]::StartCapture[启动线程 linux]|VideoCaptureDS::StartCapture[windows]
->VideoCaptureImpl::IncomingFrame->VideoCaptureImpl::DeliverCapturedFrame->
WebRtcVideoCapturer::OnIncomingCapturedFrame->
WebRtcVideoCapturer::SignalFrameCapturedOnStartThread->
SignalFrameCaptured(this, &webrtc_frame)[SignalFrameCaptured.connect(this, &VideoCapturer::OnFrameCaptured)]->
VideoCapturer::OnFrameCaptured->VideoCapturer::OnFrame[广播给多个接收者]

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