gistlib - webrtc stream in swiftui in swift

To stream video using WebRTC in SwiftUI, you have to use AVFoundation's AVCaptureSession to capture video from the device's camera and then use the RTCEAGLVideoView class from the WebRTC framework to display the video stream. Here's an example of how to do it:


main.swift
import SwiftUI
import WebRTC
import AVFoundation

struct ContentView: View {
    @State var rtcSetup: Bool = false
    let captureSession = AVCaptureSession()
    var remoteStream: RTCMediaStream? {
        didSet {
            rtcSetup = true
        }
    }
    
    var body: some View {
        VStack {
            if rtcSetup {
                RTCVideoView(remoteStream: remoteStream!)
            } else {
                Text("Loading...")
            }
        }
        .onAppear {
            setupWebRTC()
        }
    }
    
    func setupWebRTC() {
        // Create an RTCPeerConnectionFactory
        let factory = RTCPeerConnectionFactory()
        
        // Configure audio options
        let audioConstraints = RTCMediaConstraints(mandatoryConstraints: nil, optionalConstraints: nil)
        let audioSource = factory.audioSource(with: audioConstraints)
        let audioTrack = factory.audioTrack(with: audioSource, trackId: "audio0")
        
        // Configure video options
        let videoConstraints = RTCMediaConstraints(mandatoryConstraints: nil, optionalConstraints: nil)
        let videoSource = factory.videoSource(with: captureSession, constraints: videoConstraints)
        let videoTrack = factory.videoTrack(with: videoSource, trackId: "video0")
        
        // Create an RTCMediaStream
        let stream = factory.mediaStream(withStreamId: "stream0")
        stream.addAudioTrack(audioTrack)
        stream.addVideoTrack(videoTrack)
        
        // Set remote stream
        self.remoteStream = stream
        
        // Create an RTCPeerConnection
        let config = RTCConfiguration()
        let iceServers: [RTCIceServer] = []
        config.iceServers = iceServers
        let constraints = RTCMediaConstraints(mandatoryConstraints: nil, optionalConstraints: ["DtlsSrtpKeyAgreement": "true"])
        let peerConnection = factory.peerConnection(with: config, constraints: constraints, delegate: nil)
        
        // Add streams to the RTCPeerConnection
        peerConnection.add(stream)
        
        // Create an RTCOfferOptions
        let offerConstraints = RTCMediaConstraints(mandatoryConstraints: ["OfferToReceiveAudio": "true", "OfferToReceiveVideo": "true"], optionalConstraints: nil)
        let offerOptions = RTCOfferAnswerOptions(voiceActivityDetection: false, offerToReceiveAudio: true, offerToReceiveVideo: true)
        
        // Create an offer SDP using the RTCPeerConnection and the RTCOfferOptions
        peerConnection.offer(for: offerConstraints) { sdp, error in
            guard let sdp = sdp else { return }
            let rtcSessionDescription = RTCSessionDescription(type: .offer, sdp: sdp.sdp)
            
            // Set the local description of the RTCPeerConnection
            peerConnection.setLocalDescription(rtcSessionDescription) { error in
                guard error == nil else { return }
                
                // Send the offer SDP to the remote peer
                // ...
            }

        }
    }
}

struct RTCVideoView: UIViewRepresentable {
    var remoteStream: RTCMediaStream

    func makeUIView(context: Context) -> RTCEAGLVideoView {
        let videoView = RTCEAGLVideoView(frame: CGRect.zero)
        if let remoteVideoTrack = remoteStream.videoTracks.first {
            remoteVideoTrack.add(videoView)
        }
        videoView.transform = CGAffineTransform(scaleX: -1.0, y: 1.0)
        return videoView
    }

    func updateUIView(_ uiView: RTCEAGLVideoView, context: Context) {
        if let remoteVideoTrack = remoteStream.videoTracks.first {
            remoteVideoTrack.add(uiView)
        }
    }
}
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In the example above, you create a RTCPeerConnectionFactory, configure audio and video options, create an RTCMediaStream, add audio and video tracks to the stream, and create an RTCPeerConnection. You then set the local description of the RTCPeerConnection and send the offer SDP to the remote peer. Finally, you create a view that uses the RTCEAGLVideoView to display the remote stream.

Keep in mind that this is just an example and you'll need to adapt it to your specific use case. Also, make sure to request the necessary user permissions before using the camera and microphone.

webrtc stream in swiftui in swift

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