diff --git a/SRTHaishinKit/SRTConnection.swift b/SRTHaishinKit/SRTConnection.swift
index 452f7cc26..655b3a2be 100644
--- a/SRTHaishinKit/SRTConnection.swift
+++ b/SRTHaishinKit/SRTConnection.swift
@@ -18,6 +18,7 @@ public final class SRTConnection: NSObject {
     /// This instance connect to server(true) or not(false)
     @objc public private(set) dynamic var connected = false
 
+    var mode: SRTMode = .caller
     var socket: SRTSocket<SRTConnection>? {
         didSet {
             socket?.delegate = self
@@ -59,7 +60,13 @@ public final class SRTConnection: NSObject {
                 socket = .init()
                 try socket?.open(addr, mode: mode, options: options)
                 self.uri = uri
-                connected = socket?.status == SRTS_CONNECTED
+                switch mode {
+                case .listener:
+                    break
+                default:
+                    connected = socket?.status == SRTS_CONNECTED
+                }
+                self.mode = mode
                 continuation.resume()
             } catch {
                 continuation.resume(throwing: error)
@@ -98,7 +105,21 @@ public final class SRTConnection: NSObject {
 extension SRTConnection: SRTSocketDelegate {
     // MARK: SRTSocketDelegate
     func socket(_ socket: SRTSocket<SRTConnection>, status: SRT_SOCKSTATUS) {
-        connected = socket.status == SRTS_CONNECTED
+        switch mode {
+        case .caller:
+            connected = socket.status == SRTS_CONNECTED
+        case .listener:
+            let connected = socket.status == SRTS_CONNECTED
+            guard !connected else {
+                return
+            }
+            if let indexOf = clients.firstIndex(where: { $0.socket == socket.socket }) {
+                clients[indexOf].delegate = nil
+                clients[indexOf].close()
+                clients.remove(at: indexOf)
+            }
+            self.connected = false
+        }
     }
 
     func socket(_ socket: SRTSocket<SRTConnection>, incomingDataAvailabled data: Data, bytes: Int32) {
@@ -106,6 +127,15 @@ extension SRTConnection: SRTSocketDelegate {
     }
 
     func socket(_ socket: SRTSocket<SRTConnection>, didAcceptSocket client: SRTSocket<SRTConnection>) {
-        clients.append(client)
+        // only one client can accept.
+        if clients.isEmpty {
+            client.delegate = self
+            clients.append(client)
+            connected = true
+            client.startRunning()
+            client.doInput()
+        } else {
+            client.reject()
+        }
     }
 }
diff --git a/SRTHaishinKit/SRTSocket.swift b/SRTHaishinKit/SRTSocket.swift
index eb482cfae..f00076fd1 100644
--- a/SRTHaishinKit/SRTSocket.swift
+++ b/SRTHaishinKit/SRTSocket.swift
@@ -135,13 +135,18 @@ final class SRTSocket<T: SRTSocketDelegate> {
     }
 
     func doInput() {
-        incomingQueue.async {
-            repeat {
-                let result = self.recvmsg()
-                if 0 < result {
-                    self.delegate?.socket(self, incomingDataAvailabled: self.incomingBuffer, bytes: result)
-                }
-            } while self.isRunning.value
+        switch mode {
+        case .caller:
+            incomingQueue.async {
+                repeat {
+                    let result = self.recvmsg()
+                    if 0 < result {
+                        self.delegate?.socket(self, incomingDataAvailabled: self.incomingBuffer, bytes: result)
+                    }
+                } while self.isRunning.value
+            }
+        case .listener:
+            break
         }
     }
 
@@ -161,6 +166,11 @@ final class SRTSocket<T: SRTSocketDelegate> {
         return srt_bstats(socket, &perf, 1)
     }
 
+    func reject() {
+        srt_setrejectreason(socket, Int32(SRT_REJ_CLOSE.rawValue))
+        srt_close(socket)
+    }
+
     private func accept() {
         let socket = srt_accept(socket, nil, nil)
         do {
diff --git a/Sources/IO/IOStream.swift b/Sources/IO/IOStream.swift
index a62d22ed2..21361b642 100644
--- a/Sources/IO/IOStream.swift
+++ b/Sources/IO/IOStream.swift
@@ -83,6 +83,11 @@ open class IOStream: NSObject {
     /// The lockQueue.
     public let lockQueue: DispatchQueue = .init(label: "com.haishinkit.HaishinKit.IOStream.lock", qos: .userInitiated)
 
+    /// The boolean value that indicates audio samples allow access or not.
+    public internal(set) var audioSampleAccess = true
+    /// The boolean value that indicates video samples allow access or not.
+    public internal(set) var videoSampleAccess = true
+
     /// The offscreen rendering object.
     public var screen: Screen {
         return mixer.videoIO.screen
@@ -560,6 +565,9 @@ extension IOStream: IOTellyUnitDelegate {
     // MARK: IOTellyUnitDelegate
     func tellyUnit(_ tellyUnit: IOTellyUnit, dequeue sampleBuffer: CMSampleBuffer) {
         mixer.videoIO.view?.enqueue(sampleBuffer)
+        if videoSampleAccess {
+            observers.forEach { $0.stream(self, didOutput: sampleBuffer) }
+        }
     }
 
     func tellyUnit(_ tellyUnit: IOTellyUnit, didBufferingChanged: Bool) {
diff --git a/Sources/RTMP/RTMPStream.swift b/Sources/RTMP/RTMPStream.swift
index 19c13735c..3917030c8 100644
--- a/Sources/RTMP/RTMPStream.swift
+++ b/Sources/RTMP/RTMPStream.swift
@@ -171,10 +171,6 @@ open class RTMPStream: IOStream {
     public internal(set) var info = RTMPStreamInfo()
     /// The object encoding (AMF). Framework supports AMF0 only.
     public private(set) var objectEncoding: RTMPObjectEncoding = RTMPConnection.defaultObjectEncoding
-    /// The boolean value that indicates audio samples allow access or not.
-    public private(set) var audioSampleAccess = true
-    /// The boolean value that indicates video samples allow access or not.
-    public private(set) var videoSampleAccess = true
     /// Incoming audio plays on the stream or not.
     public var receiveAudio = true {
         didSet {