Namespace changes to make them make sense

src/NadekoBot.Voice/SongBuffer.cs

@@ -0,0 +1,95 @@
+using Serilog;
+using System;
+using System.Diagnostics;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace NadekoBot.Voice
+{
+    public interface ISongBuffer : IDisposable
+    {
+        Span<byte> Read(int toRead, out int read);
+        Task<bool> BufferAsync(ITrackDataSource source, CancellationToken cancellationToken);
+        void Reset();
+        void Stop();
+    }
+
+    public interface ITrackDataSource
+    {
+        public int Read(byte[] output);
+    }
+
+    public sealed class FfmpegTrackDataSource : ITrackDataSource, IDisposable
+    {
+        private Process _p;
+
+        private readonly string _streamUrl;
+        private readonly bool _isLocal;
+        private readonly string _pcmType;
+
+        private FfmpegTrackDataSource(int bitDepth, string streamUrl, bool isLocal)
+        {
+            this._pcmType = bitDepth == 16 ? "s16le" : "f32le";
+            this._streamUrl = streamUrl;
+            this._isLocal = isLocal;
+        }
+
+        public static FfmpegTrackDataSource CreateAsync(int bitDepth, string streamUrl, bool isLocal)
+        {
+            try
+            {
+                var source = new FfmpegTrackDataSource(bitDepth, streamUrl, isLocal);
+                source.StartFFmpegProcess();
+                return source;
+            }
+            catch (System.ComponentModel.Win32Exception)
+            {
+                Log.Error(@"You have not properly installed or configured FFMPEG. 
+Please install and configure FFMPEG to play music. 
+Check the guides for your platform on how to setup ffmpeg correctly:
+    Windows Guide: https://goo.gl/OjKk8F
+    Linux Guide:  https://goo.gl/ShjCUo");
+                throw;
+            }
+            catch (OperationCanceledException)
+            {
+            }
+            catch (InvalidOperationException)
+            {
+            }
+            catch (Exception ex)
+            {
+                Log.Information(ex, "Error starting ffmpeg: {ErrorMessage}", ex.Message);
+            }
+
+            return null;
+        }
+
+        private Process StartFFmpegProcess()
+        {
+            var args = $"-err_detect ignore_err -i {_streamUrl} -f {_pcmType} -ar 48000 -vn -ac 2 pipe:1 -loglevel error";
+            if (!_isLocal)
+                args = $"-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5 {args}";
+
+            return _p = Process.Start(new ProcessStartInfo
+            {
+                FileName = "ffmpeg",
+                Arguments = args,
+                UseShellExecute = false,
+                RedirectStandardOutput = true,
+                RedirectStandardError = false,
+                CreateNoWindow = true,
+            });
+        }
+
+        public int Read(byte[] output)
+            => _p.StandardOutput.BaseStream.Read(output);
+
+        public void Dispose()
+        {
+            try { _p?.Kill(); } catch { }
+
+            try { _p?.Dispose(); } catch { }
+        }
+    }
+}