BakaMusicPlayer/Bmp.Core.Lite/Playback/MiddleWare/VisualizeDataMiddleWare.cs

using Bmp.Core.Lite.Playback.Inputs;
using NAudio.Wave;

namespace Bmp.Core.Lite.Playback.MiddleWare;

public class VisualizeDataMiddleWare : IWaveProvider, IHaveBitPerRawSample
{
    public event EventHandler<VisualizeDataEventArgs>? DataTransferred;

    protected virtual void OnDataTransferred(VisualizeDataEventArgs e)
    {
        DataTransferred?.Invoke(this, e);
    }

    private readonly WaveStream _provider;

    public VisualizeDataMiddleWare(WaveStream provider) => _provider = provider;

    public int? BitPerRawSample => _provider is IHaveBitPerRawSample bpr ? bpr.BitPerRawSample : null;
    public WaveFormat WaveFormat => _provider.WaveFormat;

    public int Read(byte[] buffer, int offset, int count)
    {
        try
        {
            var read = _provider.Read(buffer, offset, count);
            OnDataTransferred(new VisualizeDataEventArgs(WaveFormat, new ReadOnlyMemory<byte>(buffer, 0, read)));
            return read;
        }
        catch //(Exception e)
        {
            if (_provider.Position < _provider.Length)
            {
                //TODO: 通知机制 流读取中断
            }
            return 0;
        }
    }
}