SilkCodec.NET

Pure C# legacy SILK v3 encoding for .NET 8 and .NET 10.

Usage

using SilkCodec.NET;

short[] monoPcm = GetMonoPcm16();

var encoder = new SilkEncoder(new SilkEncoderOptions
{
    SampleRate = 24_000,
    MaxInternalSampleRate = 24_000,
    BitRate = 25_000,
    PacketLengthMilliseconds = 20,
    Complexity = 2,
    Tencent = true
});

byte[] silk = encoder.Encode(monoPcm);
File.WriteAllBytes("voice.silk", silk);

EncodePcm16LittleEndian accepts raw mono signed 16-bit little-endian PCM bytes. Incomplete final 20 ms frames are discarded, matching the reference silk-codec/test/Encoder.c behavior.

Standard output starts with #!SILK_V3, stores each packet as a little-endian signed 16-bit length followed by payload, and ends with -1. Tencent output adds a leading 0x02 and omits the terminator.

Upstream Reference

The managed SILK codec implementation in this project is based on the SILK implementation from Jitsi/libjitsi, licensed under the Apache License 2.0.