First of all, I tried MobileVLCKit but there is too much delay
Then I wrote a UDPManager class and I am writing my codes below. I would be very happy if anyone has information and wants to direct me.
Broadcast code
ffmpeg -f avfoundation -video_size 1280x720 -framerate 30 -i "0" -c:v libx264 -preset medium -tune zerolatency -f mpegts "udp://127.0.0.1:6000?pkt_size=1316"
Live View Code (almost 0 delay)
ffplay -fflags nobuffer -flags low_delay -probesize 32 -analyzeduration 1 -strict experimental -framedrop -f mpegts -vf setpts=0 udp://127.0.0.1:6000
OR
mpv udp://127.0.0.1:6000 --no-cache --untimed --no-demuxer-thread --vd-lavc-threads=1
UDPManager
import Foundation
import AVFoundation
import CoreMedia
import VideoDecoder
import SwiftUI
import Network
import Combine
import CocoaAsyncSocket
import VideoToolbox
class UDPManager: NSObject, ObservableObject, GCDAsyncUdpSocketDelegate {
private let host: String
private let port: UInt16
private var socket: GCDAsyncUdpSocket?
@Published var videoOutput: CMSampleBuffer?
init(host: String, port: UInt16) {
self.host = host
self.port = port
}
func connectUDP() {
do {
socket = GCDAsyncUdpSocket(delegate: self, delegateQueue: .global())
//try socket?.connect(toHost: host, onPort: port)
try socket?.bind(toPort: port)
try socket?.enableBroadcast(true)
try socket?.enableReusePort(true)
try socket?.beginReceiving()
} catch {
print("UDP soketi oluşturma hatası: \(error)")
}
}
func closeUDP() {
socket?.close()
}
func udpSocket(_ sock: GCDAsyncUdpSocket, didConnectToAddress address: Data) {
print("UDP Bağlandı.")
}
func udpSocket(_ sock: GCDAsyncUdpSocket, didNotConnect error: Error?) {
print("UDP soketi bağlantı hatası: \(error?.localizedDescription ?? "Bilinmeyen hata")")
}
func udpSocket(_ sock: GCDAsyncUdpSocket, didReceive data: Data, fromAddress address: Data, withFilterContext filterContext: Any?) {
if !data.isEmpty {
DispatchQueue.main.async {
self.videoOutput = self.createSampleBuffer(from: data)
}
}
}
func createSampleBuffer(from data: Data) -> CMSampleBuffer? {
var blockBuffer: CMBlockBuffer?
var status = CMBlockBufferCreateWithMemoryBlock(
allocator: kCFAllocatorDefault,
memoryBlock: UnsafeMutableRawPointer(mutating: (data as NSData).bytes),
blockLength: data.count,
blockAllocator: kCFAllocatorNull,
customBlockSource: nil,
offsetToData: 0,
dataLength: data.count,
flags: 0,
blockBufferOut: &blockBuffer)
if status != noErr {
return nil
}
var sampleBuffer: CMSampleBuffer?
let sampleSizeArray = [data.count]
status = CMSampleBufferCreateReady(
allocator: kCFAllocatorDefault,
dataBuffer: blockBuffer,
formatDescription: nil,
sampleCount: 1,
sampleTimingEntryCount: 0,
sampleTimingArray: nil,
sampleSizeEntryCount: 1,
sampleSizeArray: sampleSizeArray,
sampleBufferOut: &sampleBuffer)
if status != noErr {
return nil
}
return sampleBuffer
}
}
I didn't know how to convert the data object to video, so I searched and found this code and wanted to try it
func createSampleBuffer(from data: Data) -> CMSampleBuffer? {
var blockBuffer: CMBlockBuffer?
var status = CMBlockBufferCreateWithMemoryBlock(
allocator: kCFAllocatorDefault,
memoryBlock: UnsafeMutableRawPointer(mutating: (data as NSData).bytes),
blockLength: data.count,
blockAllocator: kCFAllocatorNull,
customBlockSource: nil,
offsetToData: 0,
dataLength: data.count,
flags: 0,
blockBufferOut: &blockBuffer)
if status != noErr {
return nil
}
var sampleBuffer: CMSampleBuffer?
let sampleSizeArray = [data.count]
status = CMSampleBufferCreateReady(
allocator: kCFAllocatorDefault,
dataBuffer: blockBuffer,
formatDescription: nil,
sampleCount: 1,
sampleTimingEntryCount: 0,
sampleTimingArray: nil,
sampleSizeEntryCount: 1,
sampleSizeArray: sampleSizeArray,
sampleBufferOut: &sampleBuffer)
if status != noErr {
return nil
}
return sampleBuffer
}
And I tried to make CMSampleBuffer a player but it just shows a white screen and doesn't work
struct SampleBufferPlayerView: UIViewRepresentable {
typealias UIViewType = UIView
var sampleBuffer: CMSampleBuffer
func makeUIView(context: Context) -> UIView {
let view = UIView(frame: .zero)
let displayLayer = AVSampleBufferDisplayLayer()
displayLayer.videoGravity = .resizeAspectFill
view.layer.addSublayer(displayLayer)
context.coordinator.displayLayer = displayLayer
return view
}
func updateUIView(_ uiView: UIView, context: Context) {
context.coordinator.sampleBuffer = sampleBuffer
context.coordinator.updateSampleBuffer()
}
func makeCoordinator() -> Coordinator {
Coordinator()
}
class Coordinator {
var displayLayer: AVSampleBufferDisplayLayer?
var sampleBuffer: CMSampleBuffer?
func updateSampleBuffer() {
guard let displayLayer = displayLayer, let sampleBuffer = sampleBuffer else { return }
if displayLayer.isReadyForMoreMediaData {
displayLayer.enqueue(sampleBuffer)
} else {
displayLayer.requestMediaDataWhenReady(on: .main) {
if displayLayer.isReadyForMoreMediaData {
displayLayer.enqueue(sampleBuffer)
print("isReadyForMoreMediaData")
}
}
}
}
}
}
And I tried to use it but I couldn't figure it out, can anyone help me?
struct ContentView: View {
// udp://@127.0.0.1:6000
@ObservedObject var udpManager = UDPManager(host: "127.0.0.1", port: 6000)
var body: some View {
VStack {
if let buffer = udpManager.videoOutput{
SampleBufferDisplayLayerView(sampleBuffer: buffer)
.frame(width: 300, height: 200)
}
}
.onAppear(perform: {
udpManager.connectUDP()
})
}
}
friedfalafell.
