initial commit

Server.Helper/G722ChatCodec.cs

@@ -0,0 +1,61 @@
+using System;
+using NAudio.Codecs;
+using NAudio.Wave;
+
+namespace Server.Helper;
+
+public class G722ChatCodec
+{
+	private readonly int bitrate;
+
+	private readonly G722CodecState encoderState;
+
+	private readonly G722CodecState decoderState;
+
+	private readonly G722Codec codec;
+
+	public string Name => "G.722 16kHz";
+
+	public int BitsPerSecond => bitrate;
+
+	public WaveFormat RecordFormat { get; }
+
+	public bool IsAvailable => true;
+
+	public G722ChatCodec()
+	{
+		bitrate = 64000;
+		encoderState = new G722CodecState(bitrate, G722Flags.None);
+		decoderState = new G722CodecState(bitrate, G722Flags.None);
+		codec = new G722Codec();
+		RecordFormat = new WaveFormat(16000, 1);
+	}
+
+	public byte[] Encode(byte[] data, int offset, int length)
+	{
+		if (offset != 0)
+		{
+			throw new ArgumentException("G722 does not yet support non-zero offsets");
+		}
+		WaveBuffer waveBuffer = new WaveBuffer(data);
+		byte[] array = new byte[length / 4];
+		codec.Encode(encoderState, array, waveBuffer.ShortBuffer, length / 2);
+		return array;
+	}
+
+	public byte[] Decode(byte[] data, int offset, int length)
+	{
+		if (offset != 0)
+		{
+			throw new ArgumentException("G722 does not yet support non-zero offsets");
+		}
+		byte[] array = new byte[length * 4];
+		WaveBuffer waveBuffer = new WaveBuffer(array);
+		codec.Decode(decoderState, waveBuffer.ShortBuffer, data, length);
+		return array;
+	}
+
+	public void Dispose()
+	{
+	}
+}