diff --git a/Sources/Media/AVMixer.swift b/Sources/Media/AVMixer.swift
index 2ddc2cb9..a04c363a 100644
--- a/Sources/Media/AVMixer.swift
+++ b/Sources/Media/AVMixer.swift
@@ -155,7 +155,7 @@ public class AVMixer {
     #endif
     /// The recorder instance.
     public lazy var recorder = AVRecorder()
-    
+
     /// Specifies the drawable object.
     public weak var drawable: NetStreamDrawable? {
         get {
diff --git a/Sources/Net/NetStream.swift b/Sources/Net/NetStream.swift
index f89e1512..10ab7050 100644
--- a/Sources/Net/NetStream.swift
+++ b/Sources/Net/NetStream.swift
@@ -3,18 +3,24 @@ import CoreImage
 
 /// The `NetStream` class is the foundation of a RTMPStream, HTTPStream.
 open class NetStream: NSObject {
-    private static let queueKey = DispatchSpecificKey<UnsafeMutableRawPointer>()
-    private static let queueValue = UnsafeMutableRawPointer.allocate(byteCount: 1, alignment: 1)
-
+    /// The lockQueue.
     public let lockQueue: DispatchQueue = {
         let queue = DispatchQueue(label: "com.haishinkit.HaishinKit.NetStream.lock")
         queue.setSpecific(key: queueKey, value: queueValue)
         return queue
     }()
 
-    open private(set) var mixer = AVMixer()
-    open var metadata: [String: Any?] = [:]
-    open var context: CIContext? {
+    private static let queueKey = DispatchSpecificKey<UnsafeMutableRawPointer>()
+    private static let queueValue = UnsafeMutableRawPointer.allocate(byteCount: 1, alignment: 1)
+
+    /// The mixer object.
+    public private(set) var mixer = AVMixer()
+
+    /// Specifies the metadata for the stream.
+    public var metadata: [String: Any?] = [:]
+
+    /// Specifies the context object.
+    public var context: CIContext? {
         get {
             mixer.videoIO.context
         }
@@ -24,10 +30,11 @@ open class NetStream: NSObject {
     }
 
     #if os(iOS) || os(macOS)
-    open var torch: Bool {
+    /// Specifiet the device torch indicating wheter the turn on(TRUE) or not(FALSE).
+    public var torch: Bool {
         get {
             var torch: Bool = false
-            ensureLockQueue {
+            lockQueue.sync {
                 torch = self.mixer.videoIO.torch
             }
             return torch
@@ -39,8 +46,8 @@ open class NetStream: NSObject {
         }
     }
 
-    /// Specify stream video orientation.
-    open var videoOrientation: AVCaptureVideoOrientation {
+    /// Specify the video orientation for stream.
+    public var videoOrientation: AVCaptureVideoOrientation {
         get {
             mixer.videoIO.orientation
         }
@@ -50,8 +57,8 @@ open class NetStream: NSObject {
     }
     #endif
 
-    /// Specify stream audio compression properties.
-    open var audioSettings: Setting<AudioCodec, AudioCodec.Option> {
+    /// Specify the audio compression properties.
+    public var audioSettings: Setting<AudioCodec, AudioCodec.Option> {
         get {
             mixer.audioIO.codec.settings
         }
@@ -60,8 +67,8 @@ open class NetStream: NSObject {
         }
     }
 
-    /// Specify stream video compression properties.
-    open var videoSettings: Setting<VideoCodec, VideoCodec.Option> {
+    /// Specify the video compression properties.
+    public var videoSettings: Setting<VideoCodec, VideoCodec.Option> {
         get {
             mixer.videoIO.encoder.settings
         }
@@ -70,7 +77,7 @@ open class NetStream: NSObject {
         }
     }
 
-    /// Specify stream avsession properties.
+    /// Specify the avsession properties.
     open var captureSettings: Setting<AVMixer, AVMixer.Option> {
         get {
             mixer.settings
@@ -80,7 +87,8 @@ open class NetStream: NSObject {
         }
     }
 
-    open var recorderSettings: [AVMediaType: [String: Any]] {
+    /// Specifies the recorder properties.
+    public var recorderSettings: [AVMediaType: [String: Any]] {
         get {
             mixer.recorder.outputSettings
         }
@@ -94,6 +102,8 @@ open class NetStream: NSObject {
     }
 
     #if os(iOS) || os(macOS)
+    /// Attaches the camera object.
+    /// - Warning: This method can't use appendSampleBuffer at the same time.
     open func attachCamera(_ camera: AVCaptureDevice?, onError: ((_ error: NSError) -> Void)? = nil) {
         lockQueue.async {
             do {
@@ -104,6 +114,8 @@ open class NetStream: NSObject {
         }
     }
 
+    /// Attaches the microphone object.
+    /// - Warning: This method can't use appendSampleBuffer at the same time.
     open func attachAudio(_ audio: AVCaptureDevice?, automaticallyConfiguresApplicationAudioSession: Bool = false, onError: ((_ error: NSError) -> Void)? = nil) {
         lockQueue.async {
             do {
@@ -114,12 +126,15 @@ open class NetStream: NSObject {
         }
     }
 
-    open func setPointOfInterest(_ focus: CGPoint, exposure: CGPoint) {
+    /// Set the point of interest.
+    public func setPointOfInterest(_ focus: CGPoint, exposure: CGPoint) {
         mixer.videoIO.focusPointOfInterest = focus
         mixer.videoIO.exposurePointOfInterest = exposure
     }
     #endif
 
+    /// Append a CMSampleBuffer?.
+    /// - Warning: This method can't use attachCamera or attachAudio method at the same time.
     open func appendSampleBuffer(_ sampleBuffer: CMSampleBuffer, withType: AVMediaType, options: [NSObject: AnyObject]? = nil) {
         switch withType {
         case .audio:
@@ -135,37 +150,31 @@ open class NetStream: NSObject {
         }
     }
 
-    open func registerVideoEffect(_ effect: VideoEffect) -> Bool {
+    /// Register a video effect.
+    public func registerVideoEffect(_ effect: VideoEffect) -> Bool {
         mixer.videoIO.lockQueue.sync {
             self.mixer.videoIO.registerEffect(effect)
         }
     }
 
-    open func unregisterVideoEffect(_ effect: VideoEffect) -> Bool {
+    /// Unregister a video effect.
+    public func unregisterVideoEffect(_ effect: VideoEffect) -> Bool {
         mixer.videoIO.lockQueue.sync {
             self.mixer.videoIO.unregisterEffect(effect)
         }
     }
 
-    open func registerAudioEffect(_ effect: AudioEffect) -> Bool {
+    /// Register a audio effect.
+    public func registerAudioEffect(_ effect: AudioEffect) -> Bool {
         mixer.audioIO.lockQueue.sync {
             self.mixer.audioIO.registerEffect(effect)
         }
     }
 
-    open func unregisterAudioEffect(_ effect: AudioEffect) -> Bool {
+    /// Unregister a audio effect.
+    public func unregisterAudioEffect(_ effect: AudioEffect) -> Bool {
         mixer.audioIO.lockQueue.sync {
             self.mixer.audioIO.unregisterEffect(effect)
         }
     }
-
-    private func ensureLockQueue(callback: () -> Void) {
-        if DispatchQueue.getSpecific(key: NetStream.queueKey) == NetStream.queueValue {
-            callback()
-        } else {
-            lockQueue.sync {
-                callback()
-            }
-        }
-    }
 }
diff --git a/Sources/Net/NetStreamDrawable.swift b/Sources/Net/NetStreamDrawable.swift
index ec4fc116..8e432b99 100644
--- a/Sources/Net/NetStreamDrawable.swift
+++ b/Sources/Net/NetStreamDrawable.swift
@@ -6,18 +6,17 @@ public protocol NetStreamDrawable: AnyObject {
     #if !os(tvOS)
     /// Specifies the orientation of AVCaptureVideoOrientation.
     var orientation: AVCaptureVideoOrientation { get set }
-    
+
     /// Specifies the position of AVCaptureDevice.
     var position: AVCaptureDevice.Position { get set }
     #endif
-    
+
     /// The videoFormatDescription which is the current CMSampleBuffer.
     var videoFormatDescription: CMVideoFormatDescription? { get }
 
     /// Attaches a drawable to a new NetStream object.
     func attachStream(_ stream: NetStream?)
-    
+
     /// Enqueue a CMSampleBuffer? to draw.
     func enqueue(_ sampleBuffer: CMSampleBuffer?)
 }
-