From 79d8da74ac98166ec9e9dae7eff820cd9842edb3 Mon Sep 17 00:00:00 2001
From: bonmas14 <bonmas14@gmail.com>
Date: Sun, 29 Oct 2023 21:03:26 +0300
Subject: basic functionality + compute bound

---
 RayRoom.NAudio/AudioOut.cs                 | 95 ++++++++++++++++++++++++++++++
 RayRoom.NAudio/AudioSampler.cs             | 46 +++++++++++++++
 RayRoom.NAudio/RayRoom.NAudioEngine.csproj | 17 ++++++
 3 files changed, 158 insertions(+)
 create mode 100644 RayRoom.NAudio/AudioOut.cs
 create mode 100644 RayRoom.NAudio/AudioSampler.cs
 create mode 100644 RayRoom.NAudio/RayRoom.NAudioEngine.csproj

(limited to 'RayRoom.NAudio')

diff --git a/RayRoom.NAudio/AudioOut.cs b/RayRoom.NAudio/AudioOut.cs
new file mode 100644
index 0000000..79a3288
--- /dev/null
+++ b/RayRoom.NAudio/AudioOut.cs
@@ -0,0 +1,95 @@
+using NAudio.Wave;
+using RayRoom.Core;
+using RayRoom.Structures;
+
+namespace RayRoom.NAudioEngine
+{
+    public class AudioOut : ISampleProvider
+    {
+        public WaveFormat WaveFormat { get; }
+
+        public ResultContainer Container
+        { 
+            get => container;
+            
+            set
+            {
+                updatedPosition = value;
+            }
+        }
+
+        private ResultContainer updatedPosition;
+
+        private ShiftArray<float> leftBuffer;
+        private ShiftArray<float> rightBuffer;
+        private Settings settings;
+
+        private Dictionary<ISampleHandler, List<AudioSourceCollision>> sources;
+        private ResultContainer container;
+
+        public AudioOut(Settings settings)
+        {
+            this.settings = settings;
+            sources = new Dictionary<ISampleHandler, List<AudioSourceCollision>>();
+            WaveFormat = WaveFormat.CreateIeeeFloatWaveFormat(settings.frequency, 2);
+
+            leftBuffer = new ShiftArray<float>((int)(settings.frequency * (settings.maxDistanceMeters / settings.speedOfSound + 1)));
+            rightBuffer = new ShiftArray<float>((int)(settings.frequency * (settings.maxDistanceMeters / settings.speedOfSound + 1)));
+        }
+
+        public int Read(float[] buffer, int offset, int count)
+        {
+            container = updatedPosition;
+
+            float velocity = 1f / container.countOfRays;
+
+            sources.Clear();
+
+            foreach (var collision in container.distances)
+                if (sources.ContainsKey(collision.source.Handler))
+                    sources[collision.source.Handler].Add(collision);
+                else
+                    sources.Add(collision.source.Handler, new List<AudioSourceCollision>(10) { collision });
+
+            foreach (var source in sources)
+            {
+                float[] samples = new float[count / 2];
+                
+                int read = source.Key.WriteTo(samples, 0, count / 2);
+
+                foreach (var collision in source.Value)
+                {
+                    int offsetSamples = settings.GetSamplesDelay(collision.distance) * 4; 
+                    Parallel.For(0, count / 2, i =>
+                    {
+                        if (collision.channel == 0)
+                            leftBuffer[i + offsetSamples] += samples[i] * velocity * (collision.source.Loudness / MathF.Pow(collision.distance, 2));
+                        else
+                            rightBuffer[i + offsetSamples] += samples[i] * velocity * (collision.source.Loudness / MathF.Pow(collision.distance, 2));
+
+                    });
+                }
+            }
+
+            Parallel.For(0, count, i =>
+            {
+                if (i % 2 == 0)
+                {
+                    buffer[i] = leftBuffer[i / 2];
+                    leftBuffer[i / 2] = 0;
+                }
+                else
+                {
+                    buffer[i] = rightBuffer[(i - 1) / 2];
+                    rightBuffer[(i - 1) / 2] = 0;
+                }
+
+            });
+
+            leftBuffer.Offset += count / 2;
+            rightBuffer.Offset += count / 2;
+
+            return count;
+        }
+    }
+}
diff --git a/RayRoom.NAudio/AudioSampler.cs b/RayRoom.NAudio/AudioSampler.cs
new file mode 100644
index 0000000..2aebcce
--- /dev/null
+++ b/RayRoom.NAudio/AudioSampler.cs
@@ -0,0 +1,46 @@
+using NAudio.Wave;
+using RayRoom.Core;
+
+namespace RayRoom.NAudioEngine
+{
+    public class AudioSampler : ISampleHandler, IDisposable
+    {
+        public bool Loop { get; set; }
+
+        private bool disposed;
+
+        private AudioFileReader reader;
+        private ISampleProvider provider;
+
+        public AudioSampler(string file, bool looping = false)
+        {
+            disposed = false;
+            reader = new AudioFileReader(file);
+            Loop = looping;
+
+            provider = reader.ToSampleProvider();
+            provider = provider.ToMono();
+        }
+
+        public int WriteTo(float[] buffer, int offset, int count)
+        {
+            if (disposed) throw new ObjectDisposedException("AudioSampler is disposed");
+
+            int length = provider.Read(buffer, offset, count);
+
+            if (Loop && length < count)
+            {
+                reader.Position = 0;
+                length += provider.Read(buffer, length, count - length);
+            }
+
+            return length;
+        }
+
+        public void Dispose()
+        {
+            reader.Close();
+            reader.Dispose();
+        }
+    }
+}
\ No newline at end of file
diff --git a/RayRoom.NAudio/RayRoom.NAudioEngine.csproj b/RayRoom.NAudio/RayRoom.NAudioEngine.csproj
new file mode 100644
index 0000000..471fb68
--- /dev/null
+++ b/RayRoom.NAudio/RayRoom.NAudioEngine.csproj
@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="NAudio" Version="2.2.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\RayRoom\RayRoom.csproj" />
+  </ItemGroup>
+
+</Project>
-- 
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