Add multiple audio backend framework

RedBookPlayer.Models/Hardware/IAudioBackend.cs

@@ -0,0 +1,30 @@
+namespace RedBookPlayer.Models.Hardware
+{
+    public interface IAudioBackend
+    {
+        /// <summary>
+        /// Pauses the audio playback
+        /// </summary>
+        void Pause();
+
+        /// <summary>
+        /// Starts the playback.
+        /// </summary>
+        void Play();
+
+        /// <summary>
+        /// Stops the audio playback
+        /// </summary>
+        void Stop();
+
+        /// <summary>
+        /// Get the current playback state
+        /// </summary>
+        PlayerState GetPlayerState();
+
+        /// <summary>
+        /// Set the new volume value
+        /// </summary>
+        void SetVolume(float volume);
+    }
+}

RedBookPlayer.Models/Hardware/Linux/AudioBackend.cs

@@ -0,0 +1,52 @@
+using CSCore.SoundOut;
+
+namespace RedBookPlayer.Models.Hardware.Linux
+{
+    public class AudioBackend : IAudioBackend
+    {
+        /// <summary>
+        /// Sound output instance
+        /// </summary>
+        private ALSoundOut _soundOut;
+
+        public AudioBackend() { }
+
+        public AudioBackend(PlayerSource source)
+        {
+            _soundOut = new ALSoundOut(100);
+            _soundOut.Initialize(source);
+        }
+
+        #region IAudioBackend Implementation
+
+        /// <inheritdoc/>
+        public void Pause() => _soundOut.Pause();
+
+        /// <inheritdoc/>
+        public void Play() => _soundOut.Play();
+
+        /// <inheritdoc/>
+        public void Stop() => _soundOut.Stop();
+
+        /// <inheritdoc/>
+        public PlayerState GetPlayerState()
+        {
+            return (_soundOut?.PlaybackState) switch
+            {
+                PlaybackState.Paused => PlayerState.Paused,
+                PlaybackState.Playing => PlayerState.Playing,
+                PlaybackState.Stopped => PlayerState.Stopped,
+                _ => PlayerState.NoDisc,
+            };
+        }
+
+        /// <inheritdoc/>
+        public void SetVolume(float volume)
+        {
+            if (_soundOut != null)
+                _soundOut.Volume = volume;
+        }
+
+        #endregion
+    }
+}

RedBookPlayer.Models/Hardware/Mac/AudioBackend.cs

@@ -0,0 +1,52 @@
+using CSCore.SoundOut;
+
+namespace RedBookPlayer.Models.Hardware.Mac
+{
+    public class AudioBackend : IAudioBackend
+    {
+        /// <summary>
+        /// Sound output instance
+        /// </summary>
+        private ALSoundOut _soundOut;
+
+        public AudioBackend() { }
+
+        public AudioBackend(PlayerSource source)
+        {
+            _soundOut = new ALSoundOut(100);
+            _soundOut.Initialize(source);
+        }
+
+        #region IAudioBackend Implementation
+
+        /// <inheritdoc/>
+        public void Pause() => _soundOut.Pause();
+
+        /// <inheritdoc/>
+        public void Play() => _soundOut.Play();
+
+        /// <inheritdoc/>
+        public void Stop() => _soundOut.Stop();
+
+        /// <inheritdoc/>
+        public PlayerState GetPlayerState()
+        {
+            return (_soundOut?.PlaybackState) switch
+            {
+                PlaybackState.Paused => PlayerState.Paused,
+                PlaybackState.Playing => PlayerState.Playing,
+                PlaybackState.Stopped => PlayerState.Stopped,
+                _ => PlayerState.NoDisc,
+            };
+        }
+
+        /// <inheritdoc/>
+        public void SetVolume(float volume)
+        {
+            if (_soundOut != null)
+                _soundOut.Volume = volume;
+        }
+
+        #endregion
+    }
+}

RedBookPlayer.Models/Hardware/SoundOutput.cs

@@ -1,8 +1,6 @@
 using System;
 using System.Linq;
 using System.Threading.Tasks;
-using CSCore.SoundOut;
-using NWaves.Audio;
 using ReactiveUI;
 using RedBookPlayer.Models.Discs;
 
@@ -92,7 +90,7 @@ namespace RedBookPlayer.Models.Hardware
         /// <summary>
         /// Sound output instance
         /// </summary>
-        private ALSoundOut _soundOut;
+        private IAudioBackend _soundOut;
 
         /// <summary>
         /// Filtering stage for audio output
@@ -183,7 +181,7 @@ namespace RedBookPlayer.Models.Hardware
         public int ProviderRead(byte[] buffer, int offset, int count)
         {
             // Set the current volume
-            _soundOut.Volume = (float)Volume / 100;
+            _soundOut.SetVolume((float)Volume / 100);
 
             // If we have an unreadable track, just return
             if(_opticalDisc.BytesPerSector <= 0)
@@ -230,7 +228,7 @@ namespace RedBookPlayer.Models.Hardware
         /// </summary>
         public void Play()
         {
-            if(_soundOut.PlaybackState != PlaybackState.Playing)
+            if(_soundOut.GetPlayerState() != PlayerState.Playing)
                 _soundOut.Play();
 
             PlayerState = PlayerState.Playing;
@@ -241,7 +239,7 @@ namespace RedBookPlayer.Models.Hardware
         /// </summary>
         public void Pause()
         {
-            if(_soundOut.PlaybackState != PlaybackState.Paused)
+            if(_soundOut.GetPlayerState() != PlayerState.Paused)
                 _soundOut.Pause();
 
             PlayerState = PlayerState.Paused;
@@ -252,7 +250,7 @@ namespace RedBookPlayer.Models.Hardware
         /// </summary>
         public void Stop()
         {
-            if(_soundOut.PlaybackState != PlaybackState.Stopped)
+            if(_soundOut.GetPlayerState() != PlayerState.Stopped)
                 _soundOut.Stop();
 
             PlayerState = PlayerState.Stopped;
@@ -368,8 +366,14 @@ namespace RedBookPlayer.Models.Hardware
             if(_source == null)
             {
                 _source = new PlayerSource(ProviderRead);
-                _soundOut = new ALSoundOut(100);
+
-                _soundOut.Initialize(_source);
+#if LINUX
+                _soundOut = new Linux.AudioBackend(_source);
+#elif MACOS
+                _soundOut = new Mac.AudioBackend(_source);
+#elif WINDOWS
+                _soundOut = new Windows.AudioBackend(_source);
+#endif
             }
             else
             {

RedBookPlayer.Models/Hardware/Windows/AudioBackend.cs

@@ -0,0 +1,53 @@
+using CSCore.SoundOut;
+using PortAudioSharp;
+
+namespace RedBookPlayer.Models.Hardware.Windows
+{
+    public class AudioBackend : IAudioBackend
+    {
+        /// <summary>
+        /// Sound output instance
+        /// </summary>
+        private ALSoundOut _soundOut;
+
+        public AudioBackend() { }
+
+        public AudioBackend(PlayerSource source)
+        {
+            _soundOut = new ALSoundOut(100);
+            _soundOut.Initialize(source);
+        }
+
+        #region IAudioBackend Implementation
+
+        /// <inheritdoc/>
+        public void Pause() => _soundOut.Pause();
+
+        /// <inheritdoc/>
+        public void Play() => _soundOut.Play();
+
+        /// <inheritdoc/>
+        public void Stop() => _soundOut.Stop();
+
+        /// <inheritdoc/>
+        public PlayerState GetPlayerState()
+        {
+            return (_soundOut?.PlaybackState) switch
+            {
+                PlaybackState.Paused => PlayerState.Paused,
+                PlaybackState.Playing => PlayerState.Playing,
+                PlaybackState.Stopped => PlayerState.Stopped,
+                _ => PlayerState.NoDisc,
+            };
+        }
+
+        /// <inheritdoc/>
+        public void SetVolume(float volume)
+        {
+            if (_soundOut != null)
+                _soundOut.Volume = volume;
+        }
+
+        #endregion
+    }
+}

RedBookPlayer.Models/RedBookPlayer.Models.csproj

@@ -5,6 +5,16 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(RuntimeIdentifier)' == 'linux-x64'">
+    <DefineConstants>LINUX</DefineConstants>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(RuntimeIdentifier)' == 'osx-x64'">
+    <DefineConstants>MAC</DefineConstants>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(RuntimeIdentifier)' == 'win-x64'">
+    <DefineConstants>WINDOWS</DefineConstants>
+  </PropertyGroup>
+
   <ItemGroup>
     <PackageReference Include="Aaru.CommonTypes" Version="5.3.0" />
     <PackageReference Include="Aaru.Decoders" Version="5.3.0" />