webrtc代码走读十二（启动camera）

最新推荐文章于 2024-11-13 21:07:05 发布

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本文详细解析了音视频采集过程中的关键步骤，包括初始化摄像头、启动摄像头、获取摄像头数据等环节，深入探讨了WebRtcVideoCapturer、VideoCaptureDS等组件在音视频采集中的作用。

一、init camera

1）调用栈

wWinMain
->MainWnd::WndProc
->MainWnd::OnMessage
->MainWnd::OnDefaultAction
->Conductor::ConnectToPeer
->Conductor::InitializePeerConnection
->Conductor::AddStreams
->Conductor::OpenVideoCaptureDevice
->WebRtcVideoDeviceCapturerFactory::Create
->WebRtcVideoCapturer::Init
->WebRtcVcmFactory::Create
->VideoCaptureFactory::Create
->videocapturemodule::VideoCaptureImpl::Create
->videocapturemodule::VideoCaptureDS::Init

2）具体实现

Conductor::OpenVideoCaptureDevice()

WebRtcVideoDeviceCapturerFactory::Create

二、start camera

1）调用栈

MainWnd::WndProc()
->MainWnd::OnMessage()
->MainWnd::OnDefaultAction()
->Conductor::ConnectToPeer()
->Conductor::InitializePeerConnection()
->Conductor::AddStreams()
->PeerConnectionFactory::CreateVideoSource
->VideoCapturerTrackSource::Create
->VideoCapturerTrackSource::Initialize
->VideoCapturer::StartCapturing
->WebRtcVideoCapturer::Start
->videocapturemodule::VideoCaptureDS::StartCapture

三、get camera data

1）调用栈

videocapturemodule::CaptureInputPin::Receive()
->videocapturemodule::CaptureSinkFilter::ProcessCapturedFrame()
->videocapturemodule::VideoCaptureImpl::IncomingFrame()
->videocapturemodule::VideoCaptureImpl::DeliverCapturedFrame()
->WebRtcVideoCapturer::OnFrame()