iOS SWIFT - WebRTC 从前置摄像头更改为后置摄像头 [英] iOS SWIFT - WebRTC change from Front Camera to back Camera

问题描述

WebRTC 视频默认使用前置摄像头，效果很好.但是，我需要将它切换到后置摄像头，但我找不到任何代码来做到这一点.我需要编辑哪个部分?是 localView 或 localVideoTrack 还是捕获器?

WebRTC video by default uses Front Camera, which works fine. However, i need to switch it to back camera, and i have not been able to find any code to do that. Which part do i need to edit? Is it the localView or localVideoTrack or capturer?

推荐答案

Swift 3.0

对等连接只能有一个RTCVideoTrack"用于发送视频流.

Peer connection can have only one 'RTCVideoTrack' for sending video stream.

首先，要更改前/后摄像头，您必须删除对等连接上的当前视频轨道.之后，您在需要的相机上创建新的RTCVideoTrack"，并将其设置为对等连接.

At first, for change camera front/back you must remove current video track on peer connection. After then, you create new 'RTCVideoTrack' on camera which you need, and set this for peer connection.

我用过这种方法.

func swapCameraToFront() {
    let localStream: RTCMediaStream? = peerConnection?.localStreams.first as? RTCMediaStream
    localStream?.removeVideoTrack(localStream?.videoTracks.first as! RTCVideoTrack)
    let localVideoTrack: RTCVideoTrack? = createLocalVideoTrack()
    if localVideoTrack != nil {
        localStream?.addVideoTrack(localVideoTrack)
        delegate?.appClient(self, didReceiveLocalVideoTrack: localVideoTrack!)
    }
    peerConnection?.remove(localStream)
    peerConnection?.add(localStream)
}

func swapCameraToBack() {
    let localStream: RTCMediaStream? = peerConnection?.localStreams.first as? RTCMediaStream
    localStream?.removeVideoTrack(localStream?.videoTracks.first as! RTCVideoTrack)
    let localVideoTrack: RTCVideoTrack? = createLocalVideoTrackBackCamera()
    if localVideoTrack != nil {
        localStream?.addVideoTrack(localVideoTrack)
        delegate?.appClient(self, didReceiveLocalVideoTrack: localVideoTrack!)
    }
    peerConnection?.remove(localStream)
    peerConnection?.add(localStream)
}

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