Added an interface for Recording.

MonoAudio.Core/IO/DataAvailableEventArgs.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using MonoAudio.Formats;
+
+namespace MonoAudio.IO
+{
+    /// <summary>
+    /// Represents an event handler that holds recorded audio data.
+    /// </summary>
+    /// <param name="sender">The sender.</param>
+    /// <param name="e">The <see cref="DataAvailableEventArgs"/> instance containing the event data.</param>
+    public delegate void DataAvailableEventHandler(object sender, DataAvailableEventArgs e);
+
+    /// <summary>
+    /// Represents an event arguments that holds recorded audio data.<br/>
+    /// It is a <c>struct</c> which has <c>ref</c> and <c>readonly</c> modifier because the event occurs frequently and has a <see cref="Span{T}"/> to deliver a raw buffer.<br/>
+    /// <b>CAUTION! REF STRUCT! IT CANNOT BE STORED ON HEAPS!</b>
+    /// </summary>
+    public readonly ref struct DataAvailableEventArgs
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="DataAvailableEventArgs" /> struct.
+        /// </summary>
+        /// <param name="data">The data.</param>
+        /// <param name="format">The format.</param>
+        public DataAvailableEventArgs(Span<byte> data, WaveFormat format)
+        {
+            Data = data;
+            Format = format;
+        }
+
+        /// <summary>
+        /// Gets the data.
+        /// </summary>
+        /// <value>
+        /// The data.
+        /// </value>
+        public Span<byte> Data { get; }
+
+        /// <summary>
+        /// Gets the format of the available <see cref="Data"/>.
+        /// </summary>
+        /// <value>
+        /// The format.
+        /// </value>
+        public WaveFormat Format { get; }
+    }
+}

MonoAudio.Core/IO/ISoundIn.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using MonoAudio.Formats;
+
+namespace MonoAudio.IO
+{
+    /// <summary>
+    /// Defines a base infrastructure of a sound input.<br/>
+    /// CAUTION! IT HAS SOME EVENT HANDLERS! IMPLEMENTERS MUST NOT FORGET TO RELEASE THEM!
+    /// </summary>
+    public interface ISoundIn : IDisposable
+    {
+        /// <summary>
+        /// Occurs when some data are available.
+        /// </summary>
+        event DataAvailableEventHandler DataAvailable;
+
+        /// <summary>
+        /// Occurs when the recording stopped.
+        /// </summary>
+        event EventHandler<RecordingStoppedEventArgs> Stopped;
+
+        /// <summary>
+        /// Starts recording.
+        /// </summary>
+        void Start();
+
+        /// <summary>
+        /// Stops recording.
+        /// </summary>
+        void Stop();
+
+        /// <summary>
+        /// Initializes the recorder.
+        /// </summary>
+        void Initialize();
+
+        /// <summary>
+        /// Gets the state of the recording.
+        /// </summary>
+        /// <value>
+        /// The state of the recording.
+        /// </value>
+        RecordingState RecordingState { get; }
+    }
+}

MonoAudio.Core/IO/SoundOut/ISoundOut.cs → MonoAudio.Core/IO/ISoundOut.cs

@@ -2,7 +2,7 @@
 using System.Collections.Generic;
 using System.Text;
 
-namespace MonoAudio.IO.SoundOut
+namespace MonoAudio.IO
 {
     /// <summary>
     /// Defines a base infrastructure of a sound output.

MonoAudio.Core/IO/SoundOut/PlaybackState.cs → MonoAudio.Core/IO/PlaybackState.cs

@@ -1,4 +1,4 @@
-namespace MonoAudio.IO.SoundOut
+namespace MonoAudio.IO
 {
     /// <summary>
     /// Represents a state of playback.

MonoAudio.Core/IO/RecordingState.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace MonoAudio.IO
+{
+    /// <summary>
+    /// Represents a state of recording.
+    /// </summary>
+    public enum RecordingState
+    {
+        /// <summary>
+        /// The recording is stopped.
+        /// </summary>
+        Stopped,
+
+        /// <summary>
+        /// The recording is in progress.
+        /// </summary>
+        Recording
+    }
+}

MonoAudio.Core/IO/RecordingStoppedEventArgs.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace MonoAudio.IO
+{
+    /// <summary>
+    /// Represents an event arguments that tells you that the recording has (been) stopped and holds why.<br/>
+    /// </summary>
+    /// <seealso cref="StoppedEventArgs" />
+    public class RecordingStoppedEventArgs : StoppedEventArgs
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="RecordingStoppedEventArgs"/> class.
+        /// </summary>
+        public RecordingStoppedEventArgs() : this(null)
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="RecordingStoppedEventArgs"/> class.
+        /// </summary>
+        /// <param name="exception">The exception.</param>
+        public RecordingStoppedEventArgs(Exception exception) : base(exception)
+        {
+        }
+    }
+}

MonoAudio.Core/StoppedEventArgs.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace MonoAudio
+{
+    /// <summary>
+    /// Represents an event arguments that tells you that something has (been) stopped and holds why.<br/>
+    /// </summary>
+    /// <seealso cref="EventArgs" />
+    public class StoppedEventArgs : EventArgs
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="StoppedEventArgs"/> class.
+        /// </summary>
+        public StoppedEventArgs() : this(null)
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="StoppedEventArgs"/> class.
+        /// </summary>
+        /// <param name="exception">The exception.</param>
+        public StoppedEventArgs(Exception exception)
+        {
+            Exception = exception;
+        }
+
+        /// <summary>
+        /// Gets the exception.
+        /// </summary>
+        /// <value>
+        /// The exception.
+        /// </value>
+        public Exception Exception { get; }
+
+        /// <summary>
+        /// Gets a value indicating whether this instance has error.
+        /// </summary>
+        /// <value>
+        ///   <c>true</c> if this instance has error; otherwise, <c>false</c>.
+        /// </value>
+        public bool HasError => !(Exception is null);
+    }
+}

MonoAudio.UWP/SoundOut/AudioGraphOutput.cs

@@ -3,7 +3,7 @@
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
-using MonoAudio.IO.SoundOut;
+using MonoAudio.IO;
 using Windows.Foundation;
 using Windows.Media;
 using Windows.Media.Audio;

MonoAudio.Windows/SoundOut/CSCoreSoundOut.cs

@@ -5,7 +5,7 @@
 using System.Threading.Tasks;
 using CSCore.SoundOut;
 using MonoAudio.Interop;
-using MonoAudio.IO.SoundOut;
+using MonoAudio.IO;
 
 namespace MonoAudio.SoundOut
 {

MonoAudio.Windows/SoundOut/PlaybackStateUtils.cs

@@ -4,7 +4,7 @@
 using System.Runtime.CompilerServices;
 using System.Text;
 using System.Threading.Tasks;
-using MonoAudio.IO.SoundOut;
+using MonoAudio.IO;
 
 namespace MonoAudio.SoundOut
 {

Tests/MonoAudio.Output.Tests.UWP/MainPage.xaml.cs

@@ -17,7 +17,7 @@
 using MonoAudio.Formats;
 using MonoAudio.Conversion.Resampling.Sample;
 using MonoAudio.Conversion.SampleToWaveConverters;
-using MonoAudio.IO.SoundOut;
+using MonoAudio.IO;
 
 // 空白ページの項目テンプレートについては、https://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x411 を参照してください