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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>(1) { 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;
float strength = velocity * (collision.source.Loudness / (collision.distance * collision.distance));
if (collision.collisions > 1)
{
strength /= collision.collisions - 1;
}
Parallel.For(0, count / 2, i =>
{
if (collision.channel == 0)
leftBuffer[i + offsetSamples] += samples[i] * strength;
else
rightBuffer[i + offsetSamples] += samples[i] * strength;
});
}
}
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;
}
}
}
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