using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Numerics;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
using System.Security;
using System.Security.Permissions;
using System.Text;
using System.Threading;
using Concentus.Celt;
using Concentus.Celt.Structs;
using Concentus.Common;
using Concentus.Common.CPlusPlus;
using Concentus.Enums;
using Concentus.Native;
using Concentus.Silk;
using Concentus.Silk.Enums;
using Concentus.Silk.Structs;
using Concentus.Structs;
using Microsoft.CodeAnalysis;
using Microsoft.Win32.SafeHandles;

[assembly: CompilationRelaxations(8)]
[assembly: RuntimeCompatibility(WrapNonExceptionThrows = true)]
[assembly: Debuggable(DebuggableAttribute.DebuggingModes.IgnoreSymbolStoreSequencePoints)]
[assembly: InternalsVisibleTo("ParityTest, PublicKey=002400000480000094000000060200000024000052534131000400000100010071a2f675c04c87e64b9be6d37f5833c5285fb4ed883780cf6d61e80aee5d77950b2f06dd45bc634f53405f2a2b7b2332f4dfdcb0554ffc97b935e7343e76e733eea44346e56ac1098c12a66de71e324f2f503f9f2e32560910e2082d6943df50db42679a330e52979bd1eefbb59485d2c7420d158f6ab6d41bdf42d2172675e1")]
[assembly: InternalsVisibleTo("TestOpusEncode, PublicKey=002400000480000094000000060200000024000052534131000400000100010071a2f675c04c87e64b9be6d37f5833c5285fb4ed883780cf6d61e80aee5d77950b2f06dd45bc634f53405f2a2b7b2332f4dfdcb0554ffc97b935e7343e76e733eea44346e56ac1098c12a66de71e324f2f503f9f2e32560910e2082d6943df50db42679a330e52979bd1eefbb59485d2c7420d158f6ab6d41bdf42d2172675e1")]
[assembly: TargetFramework(".NETFramework,Version=v4.5.2", FrameworkDisplayName = ".NET Framework 4.5.2")]
[assembly: AssemblyCompany("Logan Stromberg")]
[assembly: AssemblyConfiguration("Release")]
[assembly: AssemblyCopyright("© Xiph.Org Foundation, Skype Limited, CSIRO, Microsoft Corp.")]
[assembly: AssemblyDescription("This package is a portable C# implementation of the Opus audio compression codec (see https://opus-codec.org/ for more details). This package contains the Opus encoder, decoder, multistream codecs, repacketizer, as well as a port of the libspeexdsp resampler. It does NOT contain code to parse .ogg or .opus container files or to manage RTP packet streams. For better performance depending on your platform, see also the Concentus.Native package.")]
[assembly: AssemblyFileVersion("2.2.2.0")]
[assembly: AssemblyInformationalVersion("2.2.2+6c2328dc19044601e33a9c11628b8d60e1f3011c")]
[assembly: AssemblyProduct("Concentus")]
[assembly: AssemblyTitle("Concentus")]
[assembly: AssemblyMetadata("RepositoryUrl", "https://github.com/lostromb/concentus")]
[assembly: SecurityPermission(SecurityAction.RequestMinimum, SkipVerification = true)]
[assembly: AssemblyVersion("2.2.2.0")]
[module: UnverifiableCode]
namespace Microsoft.CodeAnalysis
{
	[CompilerGenerated]
	[Microsoft.CodeAnalysis.Embedded]
	internal sealed class EmbeddedAttribute : Attribute
	{
	}
}
namespace System.Runtime.CompilerServices
{
	[CompilerGenerated]
	[Microsoft.CodeAnalysis.Embedded]
	internal sealed class IsReadOnlyAttribute : Attribute
	{
	}
}
namespace Concentus
{
	public interface IOpusDecoder : IDisposable
	{
		OpusBandwidth Bandwidth { get; }

		uint FinalRange { get; }

		int Gain { get; set; }

		int LastPacketDuration { get; }

		int NumChannels { get; }

		int Pitch { get; }

		int SampleRate { get; }

		int Decode(ReadOnlySpan<byte> in_data, Span<float> out_pcm, int frame_size, bool decode_fec = false);

		int Decode(ReadOnlySpan<byte> in_data, Span<short> out_pcm, int frame_size, bool decode_fec = false);

		void ResetState();

		string GetVersionString();
	}
	public interface IOpusEncoder : IDisposable
	{
		OpusApplication Application { get; set; }

		int Bitrate { get; set; }

		int ForceChannels { get; set; }

		OpusBandwidth MaxBandwidth { get; set; }

		OpusBandwidth Bandwidth { get; set; }

		bool UseDTX { get; set; }

		int Complexity { get; set; }

		bool UseInbandFEC { get; set; }

		int PacketLossPercent { get; set; }

		bool UseVBR { get; set; }

		bool UseConstrainedVBR { get; set; }

		OpusSignal SignalType { get; set; }

		int Lookahead { get; }

		int SampleRate { get; }

		int NumChannels { get; }

		uint FinalRange { get; }

		int LSBDepth { get; set; }

		OpusFramesize ExpertFrameDuration { get; set; }

		OpusMode ForceMode { set; }

		bool PredictionDisabled { get; set; }

		int Encode(ReadOnlySpan<short> in_pcm, int frame_size, Span<byte> out_data, int max_data_bytes);

		int Encode(ReadOnlySpan<float> in_pcm, int frame_size, Span<byte> out_data, int max_data_bytes);

		void ResetState();

		string GetVersionString();
	}
	public interface IOpusMultiStreamDecoder : IDisposable
	{
		OpusBandwidth Bandwidth { get; }

		uint FinalRange { get; }

		int Gain { get; set; }

		int LastPacketDuration { get; }

		int SampleRate { get; }

		int NumChannels { get; }

		int DecodeMultistream(ReadOnlySpan<byte> data, Span<float> out_pcm, int frame_size, bool decode_fec);

		int DecodeMultistream(ReadOnlySpan<byte> data, Span<short> out_pcm, int frame_size, bool decode_fec);

		void ResetState();

		string GetVersionString();
	}
	public interface IOpusMultiStreamEncoder : IDisposable
	{
		OpusApplication Application { get; set; }

		OpusBandwidth Bandwidth { get; set; }

		int Bitrate { get; set; }

		int Complexity { get; set; }

		int NumChannels { get; }

		OpusFramesize ExpertFrameDuration { get; set; }

		uint FinalRange { get; }

		OpusMode ForceMode { set; }

		int Lookahead { get; }

		int LSBDepth { get; set; }

		OpusBandwidth MaxBandwidth { get; set; }

		int PacketLossPercent { get; set; }

		bool PredictionDisabled { get; set; }

		int SampleRate { get; }

		OpusSignal SignalType { get; set; }

		bool UseConstrainedVBR { get; set; }

		bool UseDTX { get; set; }

		bool UseInbandFEC { get; set; }

		bool UseVBR { get; set; }

		int EncodeMultistream(ReadOnlySpan<float> in_pcm, int frame_size, Span<byte> out_data, int max_data_bytes);

		int EncodeMultistream(ReadOnlySpan<short> in_pcm, int frame_size, Span<byte> out_data, int max_data_bytes);

		void ResetState();

		string GetVersionString();
	}
	public interface IResampler : IDisposable
	{
		int InputLatency { get; }

		int InputStride { get; set; }

		int OutputLatencySamples { get; }

		TimeSpan OutputLatency { get; }

		int OutputStride { get; set; }

		int Quality { get; set; }

		void GetRateFraction(out int ratio_num, out int ratio_den);

		void GetRates(out int in_rate, out int out_rate);

		void ResetMem();

		void SkipZeroes();

		void Process(int channel_index, Span<float> input, ref int in_len, Span<float> output, ref int out_len);

		void Process(int channel_index, Span<short> input, ref int in_len, Span<short> output, ref int out_len);

		void ProcessInterleaved(Span<float> input, ref int in_len, Span<float> output, ref int out_len);

		void ProcessInterleaved(Span<short> input, ref int in_len, Span<short> output, ref int out_len);

		void SetRateFraction(int ratio_num, int ratio_den, int in_rate, int out_rate);

		void SetRates(int in_rate, int out_rate);
	}
	public static class OpusCodecFactory
	{
		private static readonly object _mutex = new object();

		private static bool _nativeLibInitialized = false;

		private static bool _isNativeLibAvailable = false;

		private static bool _userAllowNativeLib = true;

		public static bool AttemptToUseNativeLibrary
		{
			get
			{
				return _userAllowNativeLib;
			}
			set
			{
				_userAllowNativeLib = value;
			}
		}

		public static IOpusEncoder CreateEncoder(int sampleRate, int numChannels, OpusApplication application = OpusApplication.OPUS_APPLICATION_AUDIO, TextWriter messageLogger = null)
		{
			if (_userAllowNativeLib && NativeLibraryAvailable(messageLogger))
			{
				return NativeOpusEncoder.Create(sampleRate, numChannels, application);
			}
			return new OpusEncoder(sampleRate, numChannels, application);
		}

		public static IOpusDecoder CreateDecoder(int sampleRate, int numChannels, TextWriter messageLogger = null)
		{
			if (_userAllowNativeLib && NativeLibraryAvailable(messageLogger))
			{
				return NativeOpusDecoder.Create(sampleRate, numChannels);
			}
			return new OpusDecoder(sampleRate, numChannels);
		}

		public static IOpusMultiStreamEncoder CreateMultiStreamEncoder(int sampleRate, int numChannels, int mappingFamily, out int streams, out int coupledStreams, byte[] mapping, OpusApplication application, TextWriter messageLogger = null)
		{
			if (_userAllowNativeLib && NativeLibraryAvailable(messageLogger))
			{
				return NativeOpusMultistreamEncoder.Create(sampleRate, numChannels, mappingFamily, out streams, out coupledStreams, mapping, application);
			}
			return OpusMSEncoder.CreateSurround(sampleRate, numChannels, mappingFamily, out streams, out coupledStreams, mapping, application);
		}

		public static IOpusMultiStreamDecoder CreateMultiStreamDecoder(int sampleRate, int numChannels, int streams, int coupledStreams, byte[] mapping, TextWriter messageLogger = null)
		{
			if (_userAllowNativeLib && NativeLibraryAvailable(messageLogger))
			{
				return NativeOpusMultistreamDecoder.Create(sampleRate, numChannels, streams, coupledStreams, mapping);
			}
			return new OpusMSDecoder(sampleRate, numChannels, streams, coupledStreams, mapping);
		}

		private static bool NativeLibraryAvailable(TextWriter messageLogger)
		{
			lock (_mutex)
			{
				if (!_nativeLibInitialized)
				{
					try
					{
						_isNativeLibAvailable = NativeOpus.Initialize(messageLogger);
						messageLogger?.WriteLine($"Is native opus available? {_isNativeLibAvailable}");
					}
					catch (Exception ex)
					{
						messageLogger?.WriteLine(ex.ToString());
					}
					_nativeLibInitialized = true;
				}
				return _isNativeLibAvailable;
			}
		}
	}
	internal static class Analysis
	{
		private const double M_PI = 3.141592653;

		private const float cA = 0.43157974f;

		private const float cB = 0.678484f;

		private const float cC = 0.08595542f;

		private const float cE = (float)Math.PI / 2f;

		private const int NB_TONAL_SKIP_BANDS = 9;

		internal static float fast_atan2f(float y, float x)
		{
			if (Inlines.ABS16(x) + Inlines.ABS16(y) < 1E-09f)
			{
				x *= 1E+12f;
				y *= 1E+12f;
			}
			float num = x * x;
			float num2 = y * y;
			if (num < num2)
			{
				float num3 = (num2 + 0.678484f * num) * (num2 + 0.08595542f * num);
				if (num3 != 0f)
				{
					return (0f - x) * y * (num2 + 0.43157974f * num) / num3 + ((y < 0f) ? (-(float)Math.PI / 2f) : ((float)Math.PI / 2f));
				}
				if (!(y < 0f))
				{
					return (float)Math.PI / 2f;
				}
				return -(float)Math.PI / 2f;
			}
			float num4 = (num + 0.678484f * num2) * (num + 0.08595542f * num2);
			if (num4 != 0f)
			{
				return x * y * (num + 0.43157974f * num2) / num4 + ((y < 0f) ? (-(float)Math.PI / 2f) : ((float)Math.PI / 2f)) - ((x * y < 0f) ? (-(float)Math.PI / 2f) : ((float)Math.PI / 2f));
			}
			return ((y < 0f) ? (-(float)Math.PI / 2f) : ((float)Math.PI / 2f)) - ((x * y < 0f) ? (-(float)Math.PI / 2f) : ((float)Math.PI / 2f));
		}

		internal static void tonality_analysis_init(TonalityAnalysisState tonal)
		{
			tonal.Reset();
		}

		internal static void tonality_get_info(TonalityAnalysisState tonal, AnalysisInfo info_out, int len)
		{
			int num = tonal.read_pos;
			int num2 = tonal.write_pos - tonal.read_pos;
			if (num2 < 0)
			{
				num2 += 200;
			}
			if (len > 480 && num != tonal.write_pos)
			{
				num++;
				if (num == 200)
				{
					num = 0;
				}
			}
			if (num == tonal.write_pos)
			{
				num--;
			}
			if (num < 0)
			{
				num = 199;
			}
			info_out.Assign(tonal.info[num]);
			tonal.read_subframe += len / 120;
			while (tonal.read_subframe >= 4)
			{
				tonal.read_subframe -= 4;
				tonal.read_pos++;
			}
			if (tonal.read_pos >= 200)
			{
				tonal.read_pos -= 200;
			}
			num2 = Inlines.IMAX(num2 - 10, 0);
			float num3 = 0f;
			int i;
			for (i = 0; i < 200 - num2; i++)
			{
				num3 += tonal.pmusic[i];
			}
			for (; i < 200; i++)
			{
				num3 += tonal.pspeech[i];
			}
			num3 = num3 * tonal.music_confidence + (1f - num3) * tonal.speech_confidence;
			info_out.music_prob = num3;
		}

		internal static void tonality_analysis<T>(TonalityAnalysisState tonal, CeltMode celt_mode, ReadOnlySpan<T> x, int len, int offset, int c1, int c2, int C, int lsb_depth, Downmix.downmix_func<T> downmix)
		{
			int num = 480;
			int num2 = 240;
			float[] angle = tonal.angle;
			float[] d_angle = tonal.d_angle;
			float[] d2_angle = tonal.d2_angle;
			float[] array = new float[18];
			float[] array2 = new float[18];
			float[] array3 = new float[8];
			float[] array4 = new float[25];
			float num3 = 97.40909f;
			float num4 = 0f;
			float[] array5 = new float[2];
			int num5 = 0;
			float num6 = 0f;
			tonal.last_transition++;
			float num7 = 1f / (float)Inlines.IMIN(20, 1 + tonal.count);
			float num8 = 1f / (float)Inlines.IMIN(50, 1 + tonal.count);
			float num9 = 1f / (float)Inlines.IMIN(1000, 1 + tonal.count);
			if (tonal.count < 4)
			{
				tonal.music_prob = 0.5f;
			}
			FFTState st = celt_mode.mdct.kfft[0];
			if (tonal.count == 0)
			{
				tonal.mem_fill = 240;
			}
			downmix(x, tonal.inmem, tonal.mem_fill, Inlines.IMIN(len, 720 - tonal.mem_fill), offset, c1, c2, C);
			if (tonal.mem_fill + len < 720)
			{
				tonal.mem_fill += len;
				return;
			}
			AnalysisInfo analysisInfo = tonal.info[tonal.write_pos++];
			if (tonal.write_pos >= 200)
			{
				tonal.write_pos -= 200;
			}
			int[] array6 = new int[960];
			int[] array7 = new int[960];
			float[] array8 = new float[240];
			float[] array9 = new float[240];
			for (int i = 0; i < num2; i++)
			{
				float num10 = Tables.analysis_window[i];
				array6[2 * i] = (int)(num10 * (float)tonal.inmem[i]);
				array6[2 * i + 1] = (int)(num10 * (float)tonal.inmem[num2 + i]);
				array6[2 * (num - i - 1)] = (int)(num10 * (float)tonal.inmem[num - i - 1]);
				array6[2 * (num - i - 1) + 1] = (int)(num10 * (float)tonal.inmem[num + num2 - i - 1]);
			}
			Arrays.MemMoveInt(tonal.inmem, 480, 0, 240);
			int num11 = len - (720 - tonal.mem_fill);
			downmix(x, tonal.inmem, 240, num11, offset + 720 - tonal.mem_fill, c1, c2, C);
			tonal.mem_fill = 240 + num11;
			KissFFT.opus_fft(st, array6, array7);
			for (int i = 1; i < num2; i++)
			{
				float x2 = (float)array7[2 * i] + (float)array7[2 * (num - i)];
				float y = (float)array7[2 * i + 1] - (float)array7[2 * (num - i) + 1];
				float x3 = (float)array7[2 * i + 1] + (float)array7[2 * (num - i) + 1];
				float y2 = (float)array7[2 * (num - i)] - (float)array7[2 * i];
				float num12 = 1f / (2f * (float)Math.PI) * fast_atan2f(y, x2);
				float num13 = num12 - angle[i];
				float num14 = num13 - d_angle[i];
				float num15 = 1f / (2f * (float)Math.PI) * fast_atan2f(y2, x3);
				float num16 = num15 - num12;
				float num17 = num16 - num13;
				float num18 = num14 - (float)Math.Floor(0.5f + num14);
				array9[i] = Inlines.ABS16(num18);
				num18 *= num18;
				num18 *= num18;
				float num19 = num17 - (float)Math.Floor(0.5f + num17);
				array9[i] += Inlines.ABS16(num19);
				num19 *= num19;
				num19 *= num19;
				float num20 = 0.25f * (d2_angle[i] + 2f * num18 + num19);
				array8[i] = 1f / (1f + 640f * num3 * num20) - 0.015f;
				angle[i] = num15;
				d_angle[i] = num16;
				d2_angle[i] = num19;
			}
			float num21 = 0f;
			float num22 = 0f;
			analysisInfo.activity = 0f;
			float num23 = 0f;
			float num24 = 0f;
			if (tonal.count == 0)
			{
				for (int j = 0; j < 18; j++)
				{
					tonal.lowE[j] = 1E+10f;
					tonal.highE[j] = -1E+10f;
				}
			}
			float num25 = 0f;
			float num26 = 0f;
			for (int j = 0; j < 18; j++)
			{
				float num27 = 0f;
				float num28 = 0f;
				float num29 = 0f;
				for (int i = Tables.tbands[j]; i < Tables.tbands[j + 1]; i++)
				{
					float num30 = (float)array7[2 * i] * (float)array7[2 * i] + (float)array7[2 * (num - i)] * (float)array7[2 * (num - i)] + (float)array7[2 * i + 1] * (float)array7[2 * i + 1] + (float)array7[2 * (num - i) + 1] * (float)array7[2 * (num - i) + 1];
					num30 *= 5.55E-17f;
					num27 += num30;
					num28 += num30 * array8[i];
					num29 += num30 * 2f * (0.5f - array9[i]);
				}
				tonal.E[tonal.E_count][j] = num27;
				num23 += num29 / (1E-15f + num27);
				num26 += (float)Math.Sqrt(num27 + 1E-10f);
				array2[j] = (float)Math.Log(num27 + 1E-10f);
				tonal.lowE[j] = Inlines.MIN32(array2[j], tonal.lowE[j] + 0.01f);
				tonal.highE[j] = Inlines.MAX32(array2[j], tonal.highE[j] - 0.1f);
				if (tonal.highE[j] < tonal.lowE[j] + 1f)
				{
					tonal.highE[j] += 0.5f;
					tonal.lowE[j] -= 0.5f;
				}
				num25 += (array2[j] - tonal.lowE[j]) / (1E-15f + tonal.highE[j] - tonal.lowE[j]);
				float num31;
				float num32 = (num31 = 0f);
				for (int i = 0; i < 8; i++)
				{
					num32 += (float)Math.Sqrt(tonal.E[i][j]);
					num31 += tonal.E[i][j];
				}
				float num33 = Inlines.MIN16(0.99f, num32 / (float)Math.Sqrt(1E-15 + (double)(8f * num31)));
				num33 *= num33;
				num33 *= num33;
				num24 += num33;
				array[j] = Inlines.MAX16(num28 / (1E-15f + num27), num33 * tonal.prev_band_tonality[j]);
				num21 += array[j];
				if (j >= 9)
				{
					num21 -= array[j - 18 + 9];
				}
				num22 = Inlines.MAX16(num22, (1f + 0.03f * (float)(j - 18)) * num21);
				num4 += array[j] * (float)(j - 8);
				tonal.prev_band_tonality[j] = array[j];
			}
			float num34 = 0f;
			num5 = 0;
			num6 = 0f;
			float num35 = 0.00057f / (float)(1 << Inlines.IMAX(0, lsb_depth - 8));
			num35 *= 134217730f;
			num35 *= num35;
			for (int j = 0; j < 21; j++)
			{
				float num36 = 0f;
				int num37 = Tables.extra_bands[j];
				int num38 = Tables.extra_bands[j + 1];
				for (int i = num37; i < num38; i++)
				{
					float num39 = (float)array7[2 * i] * (float)array7[2 * i] + (float)array7[2 * (num - i)] * (float)array7[2 * (num - i)] + (float)array7[2 * i + 1] * (float)array7[2 * i + 1] + (float)array7[2 * (num - i) + 1] * (float)array7[2 * (num - i) + 1];
					num36 += num39;
				}
				num6 = Inlines.MAX32(num6, num36);
				tonal.meanE[j] = Inlines.MAX32((1f - num9) * tonal.meanE[j], num36);
				num36 = Inlines.MAX32(num36, tonal.meanE[j]);
				num34 = Inlines.MAX32(0.05f * num34, num36);
				if ((double)num36 > 0.1 * (double)num34 && num36 * 1E+09f > num6 && num36 > num35 * (float)(num38 - num37))
				{
					num5 = j;
				}
			}
			if (tonal.count <= 2)
			{
				num5 = 20;
			}
			num26 = 20f * (float)Math.Log10(num26);
			tonal.Etracker = Inlines.MAX32(tonal.Etracker - 0.03f, num26);
			tonal.lowECount *= 1f - num8;
			if (num26 < tonal.Etracker - 30f)
			{
				tonal.lowECount += num8;
			}
			for (int i = 0; i < 8; i++)
			{
				float num40 = 0f;
				for (int j = 0; j < 16; j++)
				{
					num40 += Tables.dct_table[i * 16 + j] * array2[j];
				}
				array3[i] = num40;
			}
			num24 /= 18f;
			num25 /= 18f;
			if (tonal.count < 10)
			{
				num25 = 0.5f;
			}
			num23 /= 18f;
			analysisInfo.activity = num23 + (1f - num23) * num25;
			num21 = num22 / 9f;
			num21 = (tonal.prev_tonality = Inlines.MAX16(num21, tonal.prev_tonality * 0.8f));
			num4 /= 64f;
			analysisInfo.tonality_slope = num4;
			tonal.E_count = (tonal.E_count + 1) % 8;
			tonal.count++;
			analysisInfo.tonality = num21;
			for (int i = 0; i < 4; i++)
			{
				array4[i] = -0.12299f * (array3[i] + tonal.mem[i + 24]) + 0.49195f * (tonal.mem[i] + tonal.mem[i + 16]) + 0.69693f * tonal.mem[i + 8] - 1.4349f * tonal.cmean[i];
			}
			for (int i = 0; i < 4; i++)
			{
				tonal.cmean[i] = (1f - num7) * tonal.cmean[i] + num7 * array3[i];
			}
			for (int i = 0; i < 4; i++)
			{
				array4[4 + i] = 0.63246f * (array3[i] - tonal.mem[i + 24]) + 0.31623f * (tonal.mem[i] - tonal.mem[i + 16]);
			}
			for (int i = 0; i < 3; i++)
			{
				array4[8 + i] = 0.53452f * (array3[i] + tonal.mem[i + 24]) - 0.26726f * (tonal.mem[i] + tonal.mem[i + 16]) - 0.53452f * tonal.mem[i + 8];
			}
			if (tonal.count > 5)
			{
				for (int i = 0; i < 9; i++)
				{
					tonal.std[i] = (1f - num7) * tonal.std[i] + num7 * array4[i] * array4[i];
				}
			}
			for (int i = 0; i < 8; i++)
			{
				tonal.mem[i + 24] = tonal.mem[i + 16];
				tonal.mem[i + 16] = tonal.mem[i + 8];
				tonal.mem[i + 8] = tonal.mem[i];
				tonal.mem[i] = array3[i];
			}
			for (int i = 0; i < 9; i++)
			{
				array4[11 + i] = (float)Math.Sqrt(tonal.std[i]);
			}
			array4[20] = analysisInfo.tonality;
			array4[21] = analysisInfo.activity;
			array4[22] = num24;
			array4[23] = analysisInfo.tonality_slope;
			array4[24] = tonal.lowECount;
			MultiLayerPerceptron.mlp_process(Tables.net, array4, array5);
			array5[0] = 0.5f * (array5[0] + 1f);
			array5[0] = 0.01f + 1.21f * array5[0] * array5[0] - 0.23f * (float)Math.Pow(array5[0], 10.0);
			array5[1] = 0.5f * array5[1] + 0.5f;
			array5[0] = array5[1] * array5[0] + (1f - array5[1]) * 0.5f;
			float num41 = 5E-05f * array5[1];
			float num42 = 0.05f;
			float num43 = Inlines.MAX16(0.05f, Inlines.MIN16(0.95f, array5[0]));
			float num44 = Inlines.MAX16(0.05f, Inlines.MIN16(0.95f, tonal.music_prob));
			num42 = 0.01f + 0.05f * Inlines.ABS16(num43 - num44) / (num43 * (1f - num44) + num44 * (1f - num43));
			float num45 = (1f - tonal.music_prob) * (1f - num41) + tonal.music_prob * num41;
			float num46 = tonal.music_prob * (1f - num41) + (1f - tonal.music_prob) * num41;
			num45 *= (float)Math.Pow(1f - array5[0], num42);
			num46 *= (float)Math.Pow(array5[0], num42);
			tonal.music_prob = num46 / (num45 + num46);
			analysisInfo.music_prob = tonal.music_prob;
			float num47 = 1E-20f;
			float num48 = (float)Math.Pow(1f - array5[0], num42);
			float num49 = (float)Math.Pow(array5[0], num42);
			if (tonal.count == 1)
			{
				tonal.pspeech[0] = 0.5f;
				tonal.pmusic[0] = 0.5f;
			}
			float num50 = tonal.pspeech[0] + tonal.pspeech[1];
			float num51 = tonal.pmusic[0] + tonal.pmusic[1];
			tonal.pspeech[0] = num50 * (1f - num41) * num48;
			tonal.pmusic[0] = num51 * (1f - num41) * num49;
			for (int i = 1; i < 199; i++)
			{
				tonal.pspeech[i] = tonal.pspeech[i + 1] * num48;
				tonal.pmusic[i] = tonal.pmusic[i + 1] * num49;
			}
			tonal.pspeech[199] = num51 * num41 * num48;
			tonal.pmusic[199] = num50 * num41 * num49;
			for (int i = 0; i < 200; i++)
			{
				num47 += tonal.pspeech[i] + tonal.pmusic[i];
			}
			num47 = 1f / num47;
			for (int i = 0; i < 200; i++)
			{
				tonal.pspeech[i] *= num47;
				tonal.pmusic[i] *= num47;
			}
			num47 = tonal.pmusic[0];
			for (int i = 1; i < 200; i++)
			{
				num47 += tonal.pspeech[i];
			}
			if ((double)array5[1] > 0.75)
			{
				if ((double)tonal.music_prob > 0.9)
				{
					float num52 = 1f / (float)(++tonal.music_confidence_count);
					tonal.music_confidence_count = Inlines.IMIN(tonal.music_confidence_count, 500);
					tonal.music_confidence += num52 * Inlines.MAX16(-0.2f, array5[0] - tonal.music_confidence);
				}
				if ((double)tonal.music_prob < 0.1)
				{
					float num53 = 1f / (float)(++tonal.speech_confidence_count);
					tonal.speech_confidence_count = Inlines.IMIN(tonal.speech_confidence_count, 500);
					tonal.speech_confidence += num53 * Inlines.MIN16(0.2f, array5[0] - tonal.speech_confidence);
				}
			}
			else
			{
				if (tonal.music_confidence_count == 0)
				{
					tonal.music_confidence = 0.9f;
				}
				if (tonal.speech_confidence_count == 0)
				{
					tonal.speech_confidence = 0.1f;
				}
			}
			if (tonal.last_music != ((tonal.music_prob > 0.5f) ? 1 : 0))
			{
				tonal.last_transition = 0;
			}
			tonal.last_music = ((tonal.music_prob > 0.5f) ? 1 : 0);
			analysisInfo.bandwidth = num5;
			analysisInfo.noisiness = num23;
			analysisInfo.valid = 1;
		}

		internal static void run_analysis<T>(TonalityAnalysisState analysis, CeltMode celt_mode, ReadOnlySpan<T> analysis_pcm, int analysis_frame_size, int frame_size, int c1, int c2, int C, int Fs, int lsb_depth, Downmix.downmix_func<T> downmix, AnalysisInfo analysis_info)
		{
			if (!analysis_pcm.IsEmpty)
			{
				analysis_frame_size = Inlines.IMIN(195 * Fs / 100, analysis_frame_size);
				int num = analysis_frame_size - analysis.analysis_offset;
				int num2 = analysis.analysis_offset;
				do
				{
					tonality_analysis(analysis, celt_mode, analysis_pcm, Inlines.IMIN(480, num), num2, c1, c2, C, lsb_depth, downmix);
					num2 += 480;
					num -= 480;
				}
				while (num > 0);
				analysis.analysis_offset = analysis_frame_size;
				analysis.analysis_offset -= frame_size;
			}
			analysis_info.valid = 0;
			tonality_get_info(analysis, analysis_info, frame_size);
		}
	}
	internal static class CodecHelpers
	{
		private const int MAX_DYNAMIC_FRAMESIZE = 24;

		internal static byte gen_toc(OpusMode mode, int framerate, OpusBandwidth bandwidth, int channels)
		{
			int num = 0;
			while (framerate < 400)
			{
				framerate <<= 1;
				num++;
			}
			byte b;
			switch (mode)
			{
			case OpusMode.MODE_SILK_ONLY:
				b = (byte)((int)(bandwidth - 1101) << 5);
				b |= (byte)(num - 2 << 3);
				break;
			case OpusMode.MODE_CELT_ONLY:
			{
				int num2 = (int)(bandwidth - 1102);
				if (num2 < 0)
				{
					num2 = 0;
				}
				b = 128;
				b |= (byte)(num2 << 5);
				b |= (byte)(num << 3);
				break;
			}
			default:
				b = 96;
				b |= (byte)((int)(bandwidth - 1104) << 4);
				b |= (byte)(num - 2 << 3);
				break;
			}
			return (byte)(b | (byte)(((channels == 2) ? 1u : 0u) << 2));
		}

		internal static void hp_cutoff(ReadOnlySpan<short> input, int input_ptr, int cutoff_Hz, Span<short> output, int output_ptr, int[] hp_mem, int len, int channels, int Fs)
		{
			int[] array = new int[3];
			int[] array2 = new int[2];
			int num = Inlines.silk_DIV32_16(Inlines.silk_SMULBB(2471, cutoff_Hz), Fs / 1000);
			int num2 = (array[0] = 268435456 - Inlines.silk_MUL(471, num));
			array[1] = Inlines.silk_LSHIFT(-num2, 1);
			array[2] = num2;
			int num3 = Inlines.silk_RSHIFT(num2, 6);
			array2[0] = Inlines.silk_SMULWW(num3, Inlines.silk_SMULWW(num, num) - 8388608);
			array2[1] = Inlines.silk_SMULWW(num3, num3);
			Filters.silk_biquad_alt(input, input_ptr, array, array2, hp_mem, 0, output, output_ptr, len, channels);
			if (channels == 2)
			{
				Filters.silk_biquad_alt(input, input_ptr + 1, array, array2, hp_mem, 2, output, output_ptr + 1, len, channels);
			}
		}

		internal static void dc_reject(ReadOnlySpan<short> input, int input_ptr, int cutoff_Hz, Span<short> output, int output_ptr, int[] hp_mem, int len, int channels, int Fs)
		{
			int shift = Inlines.celt_ilog2(Fs / (cutoff_Hz * 3));
			for (int i = 0; i < channels; i++)
			{
				for (int j = 0; j < len; j++)
				{
					int num = Inlines.SHL32(Inlines.EXTEND32(input[channels * j + i + input_ptr]), 15);
					int num2 = num - hp_mem[2 * i];
					hp_mem[2 * i] += Inlines.PSHR32(num - hp_mem[2 * i], shift);
					int a = num2 - hp_mem[2 * i + 1];
					hp_mem[2 * i + 1] += Inlines.PSHR32(num2 - hp_mem[2 * i + 1], shift);
					output[channels * j + i + output_ptr] = Inlines.EXTRACT16(Inlines.SATURATE(Inlines.PSHR32(a, 15), 32767));
				}
			}
		}

		internal static void stereo_fade(short[] pcm_buf, int g1, int g2, int overlap48, int frame_size, int channels, int[] window, int Fs)
		{
			int num = 48000 / Fs;
			int num2 = overlap48 / num;
			g1 = 32767 - g1;
			g2 = 32767 - g2;
			int i;
			for (i = 0; i < num2; i++)
			{
				int num3 = Inlines.MULT16_16_Q15(window[i * num], window[i * num]);
				int a = Inlines.SHR32(Inlines.MAC16_16(Inlines.MULT16_16(num3, g2), 32767 - num3, g1), 15);
				int b = Inlines.EXTRACT16(Inlines.HALF32(pcm_buf[i * channels] - pcm_buf[i * channels + 1]));
				b = Inlines.MULT16_16_Q15(a, b);
				pcm_buf[i * channels] = (short)(pcm_buf[i * channels] - b);
				pcm_buf[i * channels + 1] = (short)(pcm_buf[i * channels + 1] + b);
			}
			for (; i < frame_size; i++)
			{
				int b2 = Inlines.EXTRACT16(Inlines.HALF32(pcm_buf[i * channels] - pcm_buf[i * channels + 1]));
				b2 = Inlines.MULT16_16_Q15(g2, b2);
				pcm_buf[i * channels] = (short)(pcm_buf[i * channels] - b2);
				pcm_buf[i * channels + 1] = (short)(pcm_buf[i * channels + 1] + b2);
			}
		}

		internal static void gain_fade(short[] buffer, int buf_ptr, int g1, int g2, int overlap48, int frame_size, int channels, int[] window, int Fs)
		{
			int num = 48000 / Fs;
			int num2 = overlap48 / num;
			if (channels == 1)
			{
				for (int i = 0; i < num2; i++)
				{
					int num3 = Inlines.MULT16_16_Q15(window[i * num], window[i * num]);
					int a = Inlines.SHR32(Inlines.MAC16_16(Inlines.MULT16_16(num3, g2), 32767 - num3, g1), 15);
					buffer[buf_ptr + i] = (short)Inlines.MULT16_16_Q15(a, buffer[buf_ptr + i]);
				}
			}
			else
			{
				for (int i = 0; i < num2; i++)
				{
					int num4 = Inlines.MULT16_16_Q15(window[i * num], window[i * num]);
					int a2 = Inlines.SHR32(Inlines.MAC16_16(Inlines.MULT16_16(num4, g2), 32767 - num4, g1), 15);
					buffer[buf_ptr + i * 2] = (short)Inlines.MULT16_16_Q15(a2, buffer[buf_ptr + i * 2]);
					buffer[buf_ptr + i * 2 + 1] = (short)Inlines.MULT16_16_Q15(a2, buffer[buf_ptr + i * 2 + 1]);
				}
			}
			int num5 = 0;
			do
			{
				for (int i = num2; i < frame_size; i++)
				{
					buffer[buf_ptr + i * channels + num5] = (short)Inlines.MULT16_16_Q15(g2, buffer[buf_ptr + i * channels + num5]);
				}
			}
			while (++num5 < channels);
		}

		internal static float transient_boost(Span<float> E, int E_ptr, float[] E_1, int LM, int maxM)
		{
			float num = 0f;
			float num2 = 0f;
			int num3 = Inlines.IMIN(maxM, (1 << LM) + 1);
			for (int i = E_ptr; i < num3 + E_ptr; i++)
			{
				num += E[i];
				num2 += E_1[i];
			}
			float num4 = num * num2 / (float)(num3 * num3);
			return Inlines.MIN16(1f, (float)Math.Sqrt(Inlines.MAX16(0f, 0.05f * (num4 - 2f))));
		}

		internal static int transient_viterbi(float[] E, float[] E_1, int N, int frame_cost, int rate)
		{
			float[][] array = Arrays.InitTwoDimensionalArray<float>(24, 16);
			int[][] array2 = Arrays.InitTwoDimensionalArray<int>(24, 16);
			float num = ((rate < 80) ? 0f : ((rate <= 160) ? (((float)rate - 80f) / 80f) : 1f));
			for (int i = 0; i < 16; i++)
			{
				array2[0][i] = -1;
				array[0][i] = 1E+10f;
			}
			for (int i = 0; i < 4; i++)
			{
				array[0][1 << i] = (float)(frame_cost + rate * (1 << i)) * (1f + num * transient_boost(E, 0, E_1, i, N + 1));
				array2[0][1 << i] = i;
			}
			for (int i = 1; i < N; i++)
			{
				for (int j = 2; j < 16; j++)
				{
					array[i][j] = array[i - 1][j - 1];
					array2[i][j] = j - 1;
				}
				for (int j = 0; j < 4; j++)
				{
					array2[i][1 << j] = 1;
					float num2 = array[i - 1][1];
					for (int k = 1; k < 4; k++)
					{
						float num3 = array[i - 1][(1 << k + 1) - 1];
						if (num3 < num2)
						{
							array2[i][1 << j] = (1 << k + 1) - 1;
							num2 = num3;
						}
					}
					float num4 = (float)(frame_cost + rate * (1 << j)) * (1f + num * transient_boost(E, i, E_1, j, N - i + 1));
					array[i][1 << j] = num2;
					if (N - i < 1 << j)
					{
						array[i][1 << j] += num4 * (float)(N - i) / (float)(1 << j);
					}
					else
					{
						array[i][1 << j] += num4;
					}
				}
			}
			int num5 = 1;
			float num6 = array[N - 1][1];
			for (int i = 2; i < 16; i++)
			{
				if (array[N - 1][i] < num6)
				{
					num6 = array[N - 1][i];
					num5 = i;
				}
			}
			for (int i = N - 1; i >= 0; i--)
			{
				num5 = array2[i][num5];
			}
			return num5;
		}

		internal static int optimize_framesize<T>(ReadOnlySpan<T> x, int len, int C, int Fs, int bitrate, int tonality, float[] mem, int buffering, Downmix.downmix_func<T> downmix)
		{
			float[] array = new float[28];
			float[] array2 = new float[27];
			int num = 0;
			int num2 = Fs / 400;
			int[] array3 = new int[num2];
			array[0] = mem[0];
			array2[0] = 1f / (1f + mem[0]);
			int num3;
			int num4;
			if (buffering != 0)
			{
				num3 = 2 * num2 - buffering;
				len -= num3;
				array[1] = mem[1];
				array2[1] = 1f / (1f + mem[1]);
				array[2] = mem[2];
				array2[2] = 1f / (1f + mem[2]);
				num4 = 3;
			}
			else
			{
				num4 = 1;
				num3 = 0;
			}
			int num5 = Inlines.IMIN(len / num2, 24);
			int num6 = 0;
			int i;
			for (i = 0; i < num5; i++)
			{
				float num7 = 1f;
				downmix(x, array3, 0, num2, i * num2 + num3, 0, -2, C);
				if (i == 0)
				{
					num6 = array3[0];
				}
				for (int j = 0; j < num2; j++)
				{
					int num8 = array3[j];
					num7 += (float)(num8 - num6) * (float)(num8 - num6);
					num6 = num8;
				}
				array[i + num4] = num7;
				array2[i + num4] = 1f / num7;
			}
			array[i + num4] = array[i + num4 - 1];
			if (buffering != 0)
			{
				num5 = Inlines.IMIN(24, num5 + 2);
			}
			num = transient_viterbi(array, array2, num5, (int)((1f + 0.5f * (float)tonality) * (float)(60 * C + 40)), bitrate / 400);
			mem[0] = array[1 << num];
			if (buffering != 0)
			{
				mem[1] = array[(1 << num) + 1];
				mem[2] = array[(1 << num) + 2];
			}
			return num;
		}

		internal static int frame_size_select(int frame_size, OpusFramesize variable_duration, int Fs)
		{
			if (frame_size < Fs / 400)
			{
				return -1;
			}
			int num;
			switch (variable_duration)
			{
			case OpusFramesize.OPUS_FRAMESIZE_ARG:
				num = frame_size;
				break;
			case OpusFramesize.OPUS_FRAMESIZE_VARIABLE:
				num = Fs / 50;
				break;
			case OpusFramesize.OPUS_FRAMESIZE_2_5_MS:
			case OpusFramesize.OPUS_FRAMESIZE_5_MS:
			case OpusFramesize.OPUS_FRAMESIZE_10_MS:
			case OpusFramesize.OPUS_FRAMESIZE_20_MS:
			case OpusFramesize.OPUS_FRAMESIZE_40_MS:
			case OpusFramesize.OPUS_FRAMESIZE_60_MS:
				num = Inlines.IMIN(3 * Fs / 50, Fs / 400 << (int)(variable_duration - 5001));
				break;
			default:
				return -1;
			}
			if (num > frame_size)
			{
				return -1;
			}
			if (400 * num != Fs && 200 * num != Fs && 100 * num != Fs && 50 * num != Fs && 25 * num != Fs && 50 * num != 3 * Fs)
			{
				return -1;
			}
			return num;
		}

		internal static int compute_frame_size<T>(ReadOnlySpan<T> analysis_pcm, int frame_size, OpusFramesize variable_duration, int C, int Fs, int bitrate_bps, int delay_compensation, Downmix.downmix_func<T> downmix, float[] subframe_mem, bool analysis_enabled)
		{
			if (analysis_enabled && variable_duration == OpusFramesize.OPUS_FRAMESIZE_VARIABLE && frame_size >= Fs / 200)
			{
				int num = 3;
				num = optimize_framesize(analysis_pcm, frame_size, C, Fs, bitrate_bps, 0, subframe_mem, delay_compensation, downmix);
				while (Fs / 400 << num > frame_size)
				{
					num--;
				}
				frame_size = Fs / 400 << num;
			}
			else
			{
				frame_size = frame_size_select(frame_size, variable_duration, Fs);
			}
			if (frame_size < 0)
			{
				return -1;
			}
			return frame_size;
		}

		internal static int compute_stereo_width(ReadOnlySpan<short> pcm, int pcm_ptr, int frame_size, int Fs, StereoWidthState mem)
		{
			int num = Fs / frame_size;
			int a = 32767 - 819175 / Inlines.IMAX(50, num);
			int num3;
			int num2;
			int num4 = (num3 = (num2 = 0));
			for (int i = 0; i < frame_size - 3; i += 4)
			{
				int num5 = 0;
				int num6 = 0;
				int num7 = 0;
				int num8 = pcm_ptr + 2 * i;
				int num9 = pcm[num8];
				int num10 = pcm[num8 + 1];
				num5 = Inlines.SHR32(Inlines.MULT16_16(num9, num9), 2);
				num6 = Inlines.SHR32(Inlines.MULT16_16(num9, num10), 2);
				num7 = Inlines.SHR32(Inlines.MULT16_16(num10, num10), 2);
				num9 = pcm[num8 + 2];
				num10 = pcm[num8 + 3];
				num5 += Inlines.SHR32(Inlines.MULT16_16(num9, num9), 2);
				num6 += Inlines.SHR32(Inlines.MULT16_16(num9, num10), 2);
				num7 += Inlines.SHR32(Inlines.MULT16_16(num10, num10), 2);
				num9 = pcm[num8 + 4];
				num10 = pcm[num8 + 5];
				num5 += Inlines.SHR32(Inlines.MULT16_16(num9, num9), 2);
				num6 += Inlines.SHR32(Inlines.MULT16_16(num9, num10), 2);
				num7 += Inlines.SHR32(Inlines.MULT16_16(num10, num10), 2);
				num9 = pcm[num8 + 6];
				num10 = pcm[num8 + 7];
				num5 += Inlines.SHR32(Inlines.MULT16_16(num9, num9), 2);
				num6 += Inlines.SHR32(Inlines.MULT16_16(num9, num10), 2);
				num7 += Inlines.SHR32(Inlines.MULT16_16(num10, num10), 2);
				num4 += Inlines.SHR32(num5, 10);
				num3 += Inlines.SHR32(num6, 10);
				num2 += Inlines.SHR32(num7, 10);
			}
			mem.XX += Inlines.MULT16_32_Q15(a, num4 - mem.XX);
			mem.XY += Inlines.MULT16_32_Q15(a, num3 - mem.XY);
			mem.YY += Inlines.MULT16_32_Q15(a, num2 - mem.YY);
			mem.XX = Inlines.MAX32(0, mem.XX);
			mem.XY = Inlines.MAX32(0, mem.XY);
			mem.YY = Inlines.MAX32(0, mem.YY);
			if (Inlines.MAX32(mem.XX, mem.YY) > 210)
			{
				int num11 = Inlines.celt_sqrt(mem.XX);
				int num12 = Inlines.celt_sqrt(mem.YY);
				int num13 = Inlines.celt_sqrt(num11);
				int num14 = Inlines.celt_sqrt(num12);
				mem.XY = Inlines.MIN32(mem.XY, num11 * num12);
				int num15 = Inlines.SHR32(Inlines.frac_div32(mem.XY, 1 + Inlines.MULT16_16(num11, num12)), 16);
				int b = 32767 * Inlines.ABS16(num13 - num14) / (1 + num13 + num14);
				int num16 = Inlines.MULT16_16_Q15(Inlines.celt_sqrt(1073741824 - Inlines.MULT16_16(num15, num15)), b);
				mem.smoothed_width += (num16 - mem.smoothed_width) / num;
				mem.max_follower = Inlines.MAX16(mem.max_follower - 655 / num, mem.smoothed_width);
			}
			else
			{
				int num16 = 0;
				int num15 = 32767;
				int b = 0;
			}
			return Inlines.EXTRACT16(Inlines.MIN32(32767, 20 * mem.max_follower));
		}

		internal static void smooth_fade(Span<short> in1, int in1_ptr, Span<short> in2, int in2_ptr, Span<short> output, int output_ptr, int overlap, int channels, int[] window, int Fs)
		{
			int num = 48000 / Fs;
			for (int i = 0; i < channels; i++)
			{
				for (int j = 0; j < overlap; j++)
				{
					int num2 = Inlines.MULT16_16_Q15(window[j * num], window[j * num]);
					output[output_ptr + j * channels + i] = (short)Inlines.SHR32(Inlines.MAC16_16(Inlines.MULT16_16(num2, in2[in2_ptr + j * channels + i]), 32767 - num2, in1[in1_ptr + j * channels + i]), 15);
				}
			}
		}

		internal static string opus_strerror(int error)
		{
			string[] array = new string[8] { "success", "invalid argument", "buffer too small", "internal error", "corrupted stream", "request not implemented", "invalid state", "memory allocation failed" };
			if (error > 0 || error < -7)
			{
				return "unknown error";
			}
			return array[-error];
		}

		internal static string GetVersionString()
		{
			return "Concentus 2.1.2";
		}
	}
	internal static class Downmix
	{
		internal delegate void downmix_func<T>(ReadOnlySpan<T> _x, Span<int> sub, int sub_ptr, int subframe, int offset, int c1, int c2, int C);

		internal static void downmix_float(ReadOnlySpan<float> x, Span<int> sub, int sub_ptr, int subframe, int offset, int c1, int c2, int C)
		{
			for (int i = 0; i < subframe; i++)
			{
				sub[sub_ptr + i] = Inlines.FLOAT2INT16(x[(i + offset) * C + c1]);
			}
			if (c2 > -1)
			{
				for (int i = 0; i < subframe; i++)
				{
					sub[sub_ptr + i] += Inlines.FLOAT2INT16(x[(i + offset) * C + c2]);
				}
			}
			else if (c2 == -2)
			{
				for (int j = 1; j < C; j++)
				{
					int num = j;
					for (int i = 0; i < subframe; i++)
					{
						sub[sub_ptr + i] += Inlines.FLOAT2INT16(x[(i + offset) * C + num]);
					}
				}
			}
			int num2 = 4096;
			num2 = ((C != -2) ? (num2 / 2) : (num2 / C));
			for (int i = 0; i < subframe; i++)
			{
				sub[sub_ptr + i] *= num2;
			}
		}

		internal static void downmix_int(ReadOnlySpan<short> x, Span<int> sub, int sub_ptr, int subframe, int offset, int c1, int c2, int C)
		{
			for (int i = 0; i < subframe; i++)
			{
				sub[i + sub_ptr] = x[(i + offset) * C + c1];
			}
			if (c2 > -1)
			{
				for (int i = 0; i < subframe; i++)
				{
					sub[i + sub_ptr] += x[(i + offset) * C + c2];
				}
			}
			else if (c2 == -2)
			{
				for (int j = 1; j < C; j++)
				{
					for (int i = 0; i < subframe; i++)
					{
						sub[i + sub_ptr] += x[(i + offset) * C + j];
					}
				}
			}
			int num = 4096;
			num = ((C != -2) ? (num / 2) : (num / C));
			for (int i = 0; i < subframe; i++)
			{
				sub[i + sub_ptr] *= num;
			}
		}
	}
	internal static class MultiLayerPerceptron
	{
		private const int MAX_NEURONS = 100;

		internal static float tansig_approx(float x)
		{
			float num = 1f;
			if (!(x < 8f))
			{
				return 1f;
			}
			if (!(x > -8f))
			{
				return -1f;
			}
			if (x < 0f)
			{
				x = 0f - x;
				num = -1f;
			}
			int num2 = (int)Math.Floor(0.5f + 25f * x);
			x -= 0.04f * (float)num2;
			float num3 = Tables.tansig_table[num2];
			float num4 = 1f - num3 * num3;
			num3 += x * num4 * (1f - num3 * x);
			return num * num3;
		}

		internal static void mlp_process(MLP m, float[] input, float[] output)
		{
			float[] array = new float[100];
			float[] weights = m.weights;
			int num = 0;
			for (int i = 0; i < m.topo[1]; i++)
			{
				float num2 = weights[num];
				num++;
				for (int j = 0; j < m.topo[0]; j++)
				{
					num2 += input[j] * weights[num];
					num++;
				}
				array[i] = tansig_approx(num2);
			}
			for (int i = 0; i < m.topo[2]; i++)
			{
				float num3 = weights[num];
				num++;
				for (int k = 0; k < m.topo[1]; k++)
				{
					num3 += array[k] * weights[num];
					num++;
				}
				output[i] = tansig_approx(num3);
			}
		}
	}
	internal static class OpusCompare
	{
		private const int NBANDS = 21;

		private const int NFREQS = 240;

		private const int TEST_WIN_SIZE = 480;

		private const int TEST_WIN_STEP = 120;

		private static readonly int[] BANDS = new int[22]
		{
			0, 2, 4, 6, 8, 10, 12, 14, 16, 20,
			24, 28, 32, 40, 48, 56, 68, 80, 96, 120,
			156, 200
		};

		private static void band_energy(Pointer<float> _out, Pointer<float> _ps, Pointer<int> _bands, int _nbands, Pointer<float> _in, int _nchannels, int _nframes, int _window_sz, int _step, int _downsample)
		{
			Pointer<float> pointer = Concentus.Common.CPlusPlus.Pointer.Malloc<float>((3 + _nchannels) * _window_sz);
			Pointer<float> pointer2 = pointer.Point(_window_sz);
			Pointer<float> pointer3 = pointer2.Point(_window_sz);
			Pointer<float> pointer4 = pointer3.Point(_window_sz);
			int num = _window_sz / 2;
			for (int i = 0; i < _window_sz; i++)
			{
				pointer[i] = (float)(0.5 - 0.5 * Math.Cos(Math.PI * 2.0 / (double)(_window_sz - 1) * (double)i));
			}
			for (int i = 0; i < _window_sz; i++)
			{
				pointer2[i] = (float)Math.Cos(Math.PI * 2.0 / (double)_window_sz * (double)i);
			}
			for (int i = 0; i < _window_sz; i++)
			{
				pointer3[i] = (float)Math.Sin(Math.PI * 2.0 / (double)_window_sz * (double)i);
			}
			for (int j = 0; j < _nframes; j++)
			{
				for (int k = 0; k < _nchannels; k++)
				{
					for (int l = 0; l < _window_sz; l++)
					{
						pointer4[k * _window_sz + l] = pointer[l] * _in[(j * _step + l) * _nchannels + k];
					}
				}
				int i;
				for (int m = (i = 0); m < _nbands; m++)
				{
					float[] array = new float[2];
					for (; i < _bands[m + 1]; i++)
					{
						for (int k = 0; k < _nchannels; k++)
						{
							int num2 = 0;
							float num3;
							float num4 = (num3 = 0f);
							for (int l = 0; l < _window_sz; l++)
							{
								num4 += pointer2[num2] * pointer4[k * _window_sz + l];
								num3 -= pointer3[num2] * pointer4[k * _window_sz + l];
								num2 += i;
								if (num2 >= _window_sz)
								{
									num2 -= _window_sz;
								}
							}
							num4 *= (float)_downsample;
							num3 *= (float)_downsample;
							_ps[(j * num + i) * _nchannels + k] = num4 * num4 + num3 * num3 + 100000f;
							array[k] += _ps[(j * num + i) * _nchannels + k];
						}
					}
					if (_out != null)
					{
						_out[(j * _nbands + m) * _nchannels] = array[0] / (float)(_bands[m + 1] - _bands[m]);
						if (_nchannels == 2)
						{
							_out[(j * _nbands + m) * _nchannels + 1] = array[1] / (float)(_bands[m + 1] - _bands[m]);
						}
					}
				}
			}
		}

		internal static float compare(float[] x, float[] y, int nchannels, int rate = 48000)
		{
			int num = x.Length;
			int num2 = y.Length;
			int num3 = 21;
			int num4 = 240;
			if (rate != 8000 && rate != 12000 && rate != 16000 && rate != 24000 && rate != 48000)
			{
				throw new ArgumentException("Sampling rate must be 8000, 12000, 16000, 24000, or 48000\n");
			}
			int num5;
			if (rate != 48000)
			{
				num5 = 48000 / rate;
				switch (rate)
				{
				case 8000:
					num3 = 13;
					break;
				case 12000:
					num3 = 15;
					break;
				case 16000:
					num3 = 17;
					break;
				case 24000:
					num3 = 19;
					break;
				}
				num4 = 240 / num5;
			}
			else
			{
				num5 = 1;
			}
			if (num != num2 * num5)
			{
				throw new ArgumentException("Sample counts do not match");
			}
			if (num < 480)
			{
				throw new ArgumentException("Insufficient sample data");
			}
			int num6 = (num - 480 + 120) / 120;
			Pointer<float> pointer = Concentus.Common.CPlusPlus.Pointer.Malloc<float>(num6 * 21 * nchannels);
			Pointer<float> pointer2 = Concentus.Common.CPlusPlus.Pointer.Malloc<float>(num6 * 240 * nchannels);
			Pointer<float> pointer3 = Concentus.Common.CPlusPlus.Pointer.Malloc<float>(num6 * num4 * nchannels);
			band_energy(pointer, pointer2, BANDS.GetPointer(), 21, x.GetPointer(), nchannels, num6, 480, 120, 1);
			band_energy(null, pointer3, BANDS.GetPointer(), num3, y.GetPointer(), nchannels, num6, 480 / num5, 120 / num5, num5);
			for (int i = 0; i < num6; i++)
			{
				int j;
				for (j = 1; j < 21; j++)
				{
					for (int k = 0; k < nchannels; k++)
					{
						pointer[(i * 21 + j) * nchannels + k] += 0.1f * pointer[(i * 21 + j - 1) * nchannels + k];
					}
				}
				j = 20;
				while (j-- > 0)
				{
					for (int k = 0; k < nchannels; k++)
					{
						pointer[(i * 21 + j) * nchannels + k] += 0.03f * pointer[(i * 21 + j + 1) * nchannels + k];
					}
				}
				if (i > 0)
				{
					for (j = 0; j < 21; j++)
					{
						for (int k = 0; k < nchannels; k++)
						{
							pointer[(i * 21 + j) * nchannels + k] += 0.5f * pointer[((i - 1) * 21 + j) * nchannels + k];
						}
					}
				}
				if (nchannels == 2)
				{
					for (j = 0; j < 21; j++)
					{
						float num7 = pointer[(i * 21 + j) * nchannels];
						float num8 = pointer[(i * 21 + j) * nchannels + 1];
						pointer[(i * 21 + j) * nchannels] += 0.01f * num8;
						pointer[(i * 21 + j) * nchannels + 1] += 0.01f * num7;
					}
				}
				for (j = 0; j < num3; j++)
				{
					for (int l = BANDS[j]; l < BANDS[j + 1]; l++)
					{
						for (int k = 0; k < nchannels; k++)
						{
							pointer2[(i * 240 + l) * nchannels + k] += 0.1f * pointer[(i * 21 + j) * nchannels + k];
							pointer3[(i * num4 + l) * nchannels + k] += 0.1f * pointer[(i * 21 + j) * nchannels + k];
						}
					}
				}
			}
			for (int j = 0; j < num3; j++)
			{
				for (int l = BANDS[j]; l < BANDS[j + 1]; l++)
				{
					for (int k = 0; k < nchannels; k++)
					{
						float num9 = pointer2[l * nchannels + k];
						float num10 = pointer3[l * nchannels + k];
						for (int i = 1; i < num6; i++)
						{
							float num11 = pointer2[(i * 240 + l) * nchannels + k];
							float num12 = pointer3[(i * num4 + l) * nchannels + k];
							pointer2[(i * 240 + l) * nchannels + k] += num9;
							pointer3[(i * num4 + l) * nchannels + k] += num10;
							num9 = num11;
							num10 = num12;
						}
					}
				}
			}
			int num13 = rate switch
			{
				48000 => BANDS[21], 
				12000 => BANDS[num3], 
				_ => BANDS[num3] - 3, 
			};
			double num14 = 0.0;
			for (int i = 0; i < num6; i++)
			{
				double num15 = 0.0;
				for (int j = 0; j < num3; j++)
				{
					double num16 = 0.0;
					for (int l = BANDS[j]; l < BANDS[j + 1] && l < num13; l++)
					{
						for (int k = 0; k < nchannels; k++)
						{
							float num17 = pointer3[(i * num4 + l) * nchannels + k] / pointer2[(i * 240 + l) * nchannels + k];
							float num18 = num17 - (float)Math.Log(num17) - 1f;
							if (l >= 79 && l <= 81)
							{
								num18 *= 0.1f;
							}
							if (l == 80)
							{
								num18 *= 0.1f;
							}
							num16 += (double)num18;
						}
					}
					num16 /= (double)((BANDS[j + 1] - BANDS[j]) * nchannels);
					num15 += num16 * num16;
				}
				num15 /= 21.0;
				num15 *= num15;
				num14 += num15 * num15;
			}
			num14 = Math.Pow(num14 / (double)num6, 0.0625);
			float result = (float)(100.0 * (1.0 - 0.5 * Math.Log(1.0 + num14) / Math.Log(1.13)));
			_ = 0f;
			return result;
		}
	}
	internal static class OpusConstants
	{
		internal const int OPUS_AUTO = -1000;

		internal const int OPUS_BITRATE_MAX = -1;

		internal const int NB_FRAMES = 8;

		internal const int NB_TBANDS = 18;

		internal const int NB_TOT_BANDS = 21;

		internal const int NB_TONAL_SKIP_BANDS = 9;

		internal const int ANALYSIS_BUF_SIZE = 720;

		internal const int DETECT_SIZE = 200;

		internal const int MAX_ENCODER_BUFFER = 480;
	}
	public class OpusException : Exception
	{
		public int OpusErrorCode { get; private set; }

		internal OpusException()
			: base("Unknown error")
		{
			OpusErrorCode = -100;
		}

		internal OpusException(string message)
			: base(message)
		{
			OpusErrorCode = -100;
		}

		internal OpusException(int opusError)
			: base(CodecHelpers.opus_strerror(opusError))
		{
			OpusErrorCode = opusError;
		}

		internal OpusException(string message, int opusError)
			: base(message)
		{
			OpusErrorCode = opusError;
		}
	}
	internal static class OpusMultistream
	{
		internal static int validate_layout(ChannelLayout layout)
		{
			int num = layout.nb_streams + layout.nb_coupled_streams;
			if (num > 255)
			{
				return 0;
			}
			for (int i = 0; i < layout.nb_channels; i++)
			{
				if (layout.mapping[i] >= num && layout.mapping[i] != byte.MaxValue)
				{
					return 0;
				}
			}
			return 1;
		}

		internal static int get_left_channel(ChannelLayout layout, int stream_id, int prev)
		{
			for (int i = ((prev >= 0) ? (prev + 1) : 0); i < layout.nb_channels; i++)
			{
				if (layout.mapping[i] == stream_id * 2)
				{
					return i;
				}
			}
			return -1;
		}

		internal static int get_right_channel(ChannelLayout layout, int stream_id, int prev)
		{
			for (int i = ((prev >= 0) ? (prev + 1) : 0); i < layout.nb_channels; i++)
			{
				if (layout.mapping[i] == stream_id * 2 + 1)
				{
					return i;
				}
			}
			return -1;
		}

		internal static int get_mono_channel(ChannelLayout layout, int stream_id, int prev)
		{
			for (int i = ((prev >= 0) ? (prev + 1) : 0); i < layout.nb_channels; i++)
			{
				if (layout.mapping[i] == stream_id + layout.nb_coupled_streams)
				{
					return i;
				}
			}
			return -1;
		}
	}
	internal static class Tables
	{
		internal static readonly float[] dct_table = new float[128]
		{
			0.25f, 0.25f, 0.25f, 0.25f, 0.25f, 0.25f, 0.25f, 0.25f, 0.25f, 0.25f,
			0.25f, 0.25f, 0.25f, 0.25f, 0.25f, 0.25f, 0.351851f, 0.33833f, 0.311806f, 0.2733f,
			0.224292f, 0.166664f, 0.102631f, 0.034654f, -0.034654f, -0.102631f, -0.166664f, -0.224292f, -0.2733f, -0.311806f,
			-0.33833f, -0.351851f, 0.34676f, 0.293969f, 0.196424f, 0.068975f, -0.068975f, -0.196424f, -0.293969f, -0.34676f,
			-0.34676f, -0.293969f, -0.196424f, -0.068975f, 0.068975f, 0.196424f, 0.293969f, 0.34676f, 0.33833f, 0.224292f,
			0.034654f, -0.166664f, -0.311806f, -0.351851f, -0.2733f, -0.102631f, 0.102631f, 0.2733f, 0.351851f, 0.311806f,
			0.166664f, -0.034654f, -0.224292f, -0.33833f, 0.326641f, 0.135299f, -0.135299f, -0.326641f, -0.326641f, -0.135299f,
			0.135299f, 0.326641f, 0.326641f, 0.135299f, -0.135299f, -0.326641f, -0.326641f, -0.135299f, 0.135299f, 0.326641f,
			0.311806f, 0.034654f, -0.2733f, -0.33833f, -0.102631f, 0.224292f, 0.351851f, 0.166664f, -0.166664f, -0.351851f,
			-0.224292f, 0.102631f, 0.33833f, 0.2733f, -0.034654f, -0.311806f, 0.293969f, -0.068975f, -0.34676f, -0.196424f,
			0.196424f, 0.34676f, 0.068975f, -0.293969f, -0.293969f, 0.068975f, 0.34676f, 0.196424f, -0.196424f, -0.34676f,
			-0.068975f, 0.293969f, 0.2733f, -0.166664f, -0.33833f, 0.034654f, 0.351851f, 0.102631f, -0.311806f, -0.224292f,
			0.224292f, 0.311806f, -0.102631f, -0.351851f, -0.034654f, 0.33833f, 0.166664f, -0.2733f
		};

		internal static readonly float[] analysis_window = new float[240]
		{
			4.3E-05f, 0.000171f, 0.000385f, 0.000685f, 0.001071f, 0.001541f, 0.002098f, 0.002739f, 0.003466f, 0.004278f,
			0.005174f, 0.006156f, 0.007222f, 0.008373f, 0.009607f, 0.010926f, 0.012329f, 0.013815f, 0.015385f, 0.017037f,
			0.018772f, 0.02059f, 0.02249f, 0.024472f, 0.026535f, 0.028679f, 0.030904f, 0.03321f, 0.035595f, 0.03806f,
			0.040604f, 0.043227f, 0.045928f, 0.048707f, 0.051564f, 0.054497f, 0.057506f, 0.060591f, 0.063752f, 0.066987f,
			0.070297f, 0.07368f, 0.077136f, 0.080665f, 0.084265f, 0.087937f, 0.091679f, 0.095492f, 0.099373f, 0.103323f,
			0.107342f, 0.111427f, 0.115579f, 0.119797f, 0.12408f, 0.128428f, 0.132839f, 0.137313f, 0.141849f, 0.146447f,
			0.151105f, 0.155823f, 0.1606f, 0.165435f, 0.170327f, 0.175276f, 0.18028f, 0.18534f, 0.190453f, 0.195619f,
			0.200838f, 0.206107f, 0.211427f, 0.216797f, 0.222215f, 0.22768f, 0.233193f, 0.238751f, 0.244353f, 0.25f,
			0.255689f, 0.261421f, 0.267193f, 0.273005f, 0.278856f, 0.284744f, 0.29067f, 0.296632f, 0.302628f, 0.308658f,
			0.314721f, 0.320816f, 0.326941f, 0.333097f, 0.33928f, 0.345492f, 0.351729f, 0.357992f, 0.36428f, 0.37059f,
			0.376923f, 0.383277f, 0.389651f, 0.396044f, 0.402455f, 0.408882f, 0.415325f, 0.421783f, 0.428254f, 0.434737f,
			0.441231f, 0.447736f, 0.454249f, 0.46077f, 0.467298f, 0.473832f, 0.48037f, 0.486912f, 0.493455f, 0.5f,
			0.506545f, 0.513088f, 0.51963f, 0.526168f, 0.532702f, 0.53923f, 0.545751f, 0.552264f, 0.558769f, 0.565263f,
			0.571746f, 0.578217f, 0.584675f, 0.591118f, 0.597545f, 0.603956f, 0.610349f, 0.616723f, 0.623077f, 0.62941f,
			0.63572f, 0.642008f, 0.648271f, 0.654508f, 0.66072f, 0.666903f, 0.673059f, 0.679184f, 0.685279f, 0.691342f,
			0.697372f, 0.703368f, 0.70933f, 0.715256f, 0.721144f, 0.726995f, 0.732807f, 0.738579f, 0.744311f, 0.75f,
			0.755647f, 0.761249f, 0.766807f, 0.77232f, 0.777785f, 0.783203f, 0.788573f, 0.793893f, 0.799162f, 0.804381f,
			0.809547f, 0.81466f, 0.81972f, 0.824724f, 0.829673f, 0.834565f, 0.8394f, 0.844177f, 0.848895f, 0.853553f,
			0.858151f, 0.862687f, 0.867161f, 0.871572f, 0.87592f, 0.880203f, 0.884421f, 0.888573f, 0.892658f, 0.896677f,
			0.900627f, 0.904508f, 0.908321f, 0.912063f, 0.915735f, 0.919335f, 0.922864f, 0.92632f, 0.929703f, 0.933013f,
			0.936248f, 0.939409f, 0.942494f, 0.945503f, 0.948436f, 0.951293f, 0.954072f, 0.956773f, 0.959396f, 0.96194f,
			0.964405f, 0.96679f, 0.969096f, 0.971321f, 0.973465f, 0.975528f, 0.97751f, 0.97941f, 0.981228f, 0.982963f,
			0.984615f, 0.986185f, 0.987671f, 0.989074f, 0.990393f, 0.991627f, 0.992778f, 0.993844f, 0.994826f, 0.995722f,
			0.996534f, 0.997261f, 0.997902f, 0.998459f, 0.998929f, 0.999315f, 0.999615f, 0.999829f, 0.999957f, 1f
		};

		internal static readonly int[] tbands = new int[19]
		{
			2, 4, 6, 8, 10, 12, 14, 16, 20, 24,
			28, 32, 40, 48, 56, 68, 80, 96, 120
		};

		internal static readonly int[] extra_bands = new int[22]
		{
			1, 2, 4, 6, 8, 10, 12, 14, 16, 20,
			24, 28, 32, 40, 48, 56, 68, 80, 96, 120,
			160, 200
		};

		internal static readonly float[] weights = new float[422]
		{
			-0.0941125f,
			-0.302976f,
			-0.603555f,
			-0.19393f,
			-0.185983f,
			-0.601617f,
			-0.0465317f,
			-0.114563f,
			-0.103599f,
			-0.618938f,
			-0.317859f,
			-0.169949f,
			-0.0702885f,
			0.148065f,
			0.409524f,
			0.548432f,
			0.367649f,
			-0.494393f,
			0.764306f,
			-1.83957f,
			0.170849f,
			12.786f,
			-1.08848f,
			-1.27284f,
			-16.2606f,
			24.1773f,
			-5.57454f,
			-0.17276f,
			-0.163388f,
			-0.224421f,
			-0.0948944f,
			-0.0728695f,
			-0.26557f,
			-0.100283f,
			-0.0515459f,
			-0.146142f,
			-0.120674f,
			-0.180655f,
			0.12857f,
			0.442138f,
			-0.493735f,
			0.167767f,
			0.206699f,
			-0.197567f,
			0.417999f,
			1.50364f,
			-0.773341f,
			-10.0401f,
			0.401872f,
			2.97966f,
			15.2165f,
			-1.88905f,
			-1.19254f,
			0.0285397f,
			-0.00405139f,
			0.0707565f,
			0.00825699f,
			-0.0927269f,
			-0.010393f,
			-0.00428882f,
			-0.00489743f,
			-0.0709731f,
			-0.00255992f,
			0.0395619f,
			0.226424f,
			0.0325231f,
			0.162175f,
			-0.100118f,
			0.485789f,
			0.12697f,
			0.285937f,
			0.0155637f,
			0.10546f,
			3.05558f,
			1.15059f,
			-1.00904f,
			-1.83088f,
			3.31766f,
			-3.42516f,
			-0.119135f,
			-0.0405654f,
			0.00690068f,
			0.0179877f,
			-0.0382487f,
			0.00597941f,
			-0.0183611f,
			0.00190395f,
			-0.144322f,
			-0.0435671f,
			0.000990594f,
			0.221087f,
			0.142405f,
			0.484066f,
			0.404395f,
			0.511955f,
			-0.237255f,
			0.241742f,
			0.35045f,
			-0.699428f,
			10.3993f,
			2.6507f,
			-2.43459f,
			-4.18838f,
			1.05928f,
			1.71067f,
			0.00667811f,
			-0.0721335f,
			-0.0397346f,
			0.0362704f,
			-0.11496f,
			-0.0235776f,
			0.0082161f,
			-0.0141741f,
			-0.0329699f,
			-0.0354253f,
			0.00277404f,
			-0.290654f,
			-1.14767f,
			-0.319157f,
			-0.686544f,
			0.36897f,
			0.478899f,
			0.182579f,
			-0.411069f,
			0.881104f,
			-4.60683f,
			1.4697f,
			325f / (356f * (float)Math.E),
			-1.81905f,
			-30.1699f,
			5.55225f,
			0.0019508f,
			-0.123576f,
			-0.0727332f,
			-0.0641597f,
			-0.0534458f,
			-0.108166f,
			-0.0937368f,
			-0.0697883f,
			-0.0275475f,
			-0.192309f,
			-0.110074f,
			0.285375f,
			-0.405597f,
			0.0926724f,
			-0.287881f,
			-0.851193f,
			-0.099493f,
			-0.233764f,
			-1.2852f,
			1.13611f,
			3.12168f,
			-0.0699f,
			-1.86216f,
			2.65292f,
			-7.31036f,
			2.44776f,
			-0.00111802f,
			-0.0632786f,
			-0.0376296f,
			-0.149851f,
			0.142963f,
			0.184368f,
			0.123433f,
			0.0756158f,
			0.117312f,
			0.0933395f,
			0.0692163f,
			0.0842592f,
			0.0704683f,
			0.0589963f,
			0.0942205f,
			-0.448862f,
			0.0262677f,
			0.270352f,
			-0.262317f,
			0.172586f,
			2.00227f,
			-0.159216f,
			0.038422f,
			10.2073f,
			4.15536f,
			-2.3407f,
			-0.0550265f,
			0.00964792f,
			-0.141336f,
			0.0274501f,
			0.0343921f,
			-0.0487428f,
			0.0950172f,
			-0.00775017f,
			-0.0372492f,
			-0.00548121f,
			-0.0663695f,
			0.0960506f,
			-0.200008f,
			-0.0412827f,
			0.58728f,
			0.0515787f,
			0.337254f,
			0.855024f,
			0.668371f,
			-0.114904f,
			-3.62962f,
			-0.467477f,
			-0.215472f,
			2.61537f,
			0.406117f,
			-1.36373f,
			0.0425394f,
			0.12208f,
			0.0934502f,
			0.123055f,
			0.0340935f,
			-0.142466f,
			0.035037f,
			-0.0490666f,
			0.0733208f,
			0.0576672f,
			0.123984f,
			-0.0517194f,
			-0.253018f,
			0.590565f,
			0.145849f,
			0.315185f,
			0.221534f,
			-0.149081f,
			0.216161f,
			-0.349575f,
			24.5664f,
			-0.994196f,
			0.614289f,
			-18.7905f,
			-2.83277f,
			-0.716801f,
			-0.347201f,
			0.479515f,
			-0.246027f,
			0.0758683f,
			0.137293f,
			-0.17781f,
			0.118751f,
			-0.00108329f,
			-0.237334f,
			0.355732f,
			-0.12991f,
			-0.0547627f,
			-0.318576f,
			-0.325524f,
			0.180494f,
			-0.0625604f,
			0.141219f,
			0.344064f,
			0.37658f,
			-0.591772f,
			5.8427f,
			-0.38075f,
			0.221894f,
			-1.41934f,
			-1879430f,
			1.34114f,
			0.0283355f,
			-0.0447856f,
			-0.0211466f,
			-0.0256927f,
			0.0139618f,
			0.0207934f,
			-0.0107666f,
			0.0110969f,
			0.0586069f,
			-0.0253545f,
			-0.0328433f,
			0.11872f,
			-0.216943f,
			0.145748f,
			0.119808f,
			-0.0915211f,
			-0.120647f,
			-0.0787719f,
			-0.143644f,
			-0.595116f,
			-1.152f,
			-1.25335f,
			-1.17092f,
			4.34023f,
			-975268f,
			-1.37033f,
			-0.0401123f,
			0.210602f,
			-0.136656f,
			0.135962f,
			-0.0523293f,
			0.0444604f,
			0.0143928f,
			0.00412666f,
			-0.0193003f,
			0.218452f,
			-0.110204f,
			-2.02563f,
			0.918238f,
			-2.45362f,
			1.19542f,
			-0.061362f,
			-1.92243f,
			0.308111f,
			0.49764f,
			0.912356f,
			0.209272f,
			-2.34525f,
			2.19326f,
			-6.47121f,
			1.69771f,
			-0.725123f,
			0.0118929f,
			0.0377944f,
			0.0554003f,
			0.0226452f,
			-0.0704421f,
			-0.0300309f,
			0.0122978f,
			-0.0041782f,
			-0.0686612f,
			0.0313115f,
			0.039111f,
			0.364111f,
			-0.0945548f,
			0.0229876f,
			-0.17414f,
			0.329795f,
			0.114714f,
			0.30022f,
			0.106997f,
			0.132355f,
			5.79932f,
			0.908058f,
			-0.905324f,
			-3.3561f,
			0.190647f,
			0.184211f,
			-0.673648f,
			0.231807f,
			-0.0586222f,
			0.230752f,
			-0.438277f,
			0.245857f,
			-0.17215f,
			0.0876383f,
			-0.720512f,
			0.162515f,
			0.0170571f,
			0.101781f,
			0.388477f,
			1.32931f,
			1.08548f,
			-0.936301f,
			-2.36958f,
			-6.71988f,
			-3.44376f,
			2.13818f,
			14.2318f,
			4.91459f,
			-3.09052f,
			-9.69191f,
			-0.768234f,
			1.79604f,
			0.0549653f,
			0.163399f,
			0.0797025f,
			0.0343933f,
			-0.0555876f,
			-0.00505673f,
			0.0187258f,
			0.0326628f,
			0.0231486f,
			0.15573f,
			0.0476223f,
			-0.254824f,
			1.60155f,
			-0.801221f,
			2.55496f,
			0.737629f,
			-1.36249f,
			-0.695463f,
			-2.44301f,
			-1.73188f,
			3.95279f,
			1.89068f,
			0.486087f,
			-11.3343f,
			3941600f,
			-0.381439f,
			0.12115f,
			-0.906927f,
			2.93878f,
			1.6388f,
			0.882811f,
			0.874344f,
			1.21726f,
			-0.874545f,
			0.321706f,
			0.785055f,
			0.946558f,
			-0.575066f,
			-3.46553f,
			0.884905f,
			0.0924047f,
			-9.90712f,
			0.391338f,
			0.160103f,
			-2.04954f,
			4.1455f,
			0.0684029f,
			-0.144761f,
			-0.285282f,
			0.379244f,
			-1.1584f,
			-0.0277241f,
			-9.85f,
			-4.82386f,
			3.71333f,
			3.87308f,
			3.52558f
		};

		internal static readonly int[] topo = new int[3] { 25, 15, 2 };

		internal static readonly MLP net = new MLP
		{
			layers = 3,
			topo = topo,
			weights = weights
		};

		internal static readonly float[] tansig_table = new float[201]
		{
			0f, 0.039979f, 0.07983f, 0.119427f, 0.158649f, 0.197375f, 0.235496f, 0.272905f, 0.309507f, 0.345214f,
			0.379949f, 0.413644f, 0.446244f, 0.4777f, 0.507977f, 0.53705f, 0.5649f, 0.591519f, 0.616909f, 0.641077f,
			0.664037f, 0.685809f, 0.706419f, 0.725897f, 0.744277f, 0.761594f, 0.777888f, 0.793199f, 0.807569f, 0.82104f,
			0.833655f, 0.845456f, 0.856485f, 0.866784f, 0.876393f, 0.885352f, 0.893698f, 0.901468f, 0.908698f, 0.91542f,
			0.921669f, 0.927473f, 0.932862f, 0.937863f, 0.942503f, 0.946806f, 0.950795f, 0.954492f, 0.957917f, 0.96109f,
			0.964028f, 0.966747f, 0.969265f, 0.971594f, 0.973749f, 0.975743f, 0.977587f, 0.979293f, 0.980869f, 0.982327f,
			0.983675f, 0.984921f, 0.986072f, 0.987136f, 0.988119f, 0.989027f, 0.989867f, 0.990642f, 0.991359f, 0.99202f,
			0.992631f, 0.993196f, 0.993718f, 0.994199f, 0.994644f, 0.995055f, 0.995434f, 0.995784f, 0.996108f, 0.996407f,
			0.996682f, 0.996937f, 0.997172f, 0.997389f, 0.99759f, 0.997775f, 0.997946f, 0.998104f, 0.998249f, 0.998384f,
			0.998508f, 0.998623f, 0.998728f, 0.998826f, 0.998916f, 0.999f, 0.999076f, 0.999147f, 0.999213f, 0.999273f,
			0.999329f, 0.999381f, 0.999428f, 0.999472f, 0.999513f, 0.99955f, 0.999585f, 0.999617f, 0.999646f, 0.999673f,
			0.999699f, 0.999722f, 0.999743f, 0.999763f, 0.999781f, 0.999798f, 0.999813f, 0.999828f, 0.999841f, 0.999853f,
			0.999865f, 0.999875f, 0.999885f, 0.999893f, 0.999902f, 0.999909f, 0.999916f, 0.999923f, 0.999929f, 0.999934f,
			0.999939f, 0.999944f, 0.999948f, 0.999952f, 0.999956f, 0.999959f, 0.999962f, 0.999965f, 0.999968f, 0.99997f,
			0.999973f, 0.999975f, 0.999977f, 0.999978f, 0.99998f, 0.999982f, 0.999983f, 0.999984f, 0.999986f, 0.999987f,
			0.999988f, 0.999989f, 0.99999f, 0.99999f, 0.999991f, 0.999992f, 0.999992f, 0.999993f, 0.999994f, 0.999994f,
			0.999994f, 0.999995f, 0.999995f, 0.999996f, 0.999996f, 0.999996f, 0.999997f, 0.999997f, 0.999997f, 0.999997f,
			0.999997f, 0.999998f, 0.999998f, 0.999998f, 0.999998f, 0.999998f, 0.999998f, 0.999999f, 0.999999f, 0.999999f,
			0.999999f, 0.999999f, 0.999999f, 0.999999f, 0.999999f, 0.999999f, 0.999999f, 0.999999f, 0.999999f, 0.999999f,
			1f, 1f, 1f, 1f, 1f, 1f, 1f, 1f, 1f, 1f,
			1f
		};

		internal static readonly int[] mono_voice_bandwidth_thresholds = new int[8] { 11000, 1000, 14000, 1000, 17000, 1000, 21000, 2000 };

		internal static readonly int[] mono_music_bandwidth_thresholds = new int[8] { 12000, 1000, 15000, 1000, 18000, 2000, 22000, 2000 };

		internal static readonly int[] stereo_voice_bandwidth_thresholds = new int[8] { 11000, 1000, 14000, 1000, 21000, 2000, 28000, 2000 };

		internal static readonly int[] stereo_music_bandwidth_thresholds = new int[8] { 12000, 1000, 18000, 2000, 21000, 2000, 30000, 2000 };

		internal const int stereo_voice_threshold = 30000;

		internal const int stereo_music_threshold = 30000;

		internal static readonly int[][] mode_thresholds = new int[2][]
		{
			new int[2] { 64000, 16000 },
			new int[2] { 36000, 16000 }
		};
	}
	public static class ResamplerFactory
	{
		public static IResampler CreateResampler(int numChannels, int inRate, int outRate, int quality, TextWriter logger = null)
		{
			return CreateResampler(numChannels, inRate, outRate, inRate, outRate, quality, logger);
		}

		public static IResampler CreateResampler(int numChannels, int ratioNum, int ratioDen, int inRate, int outRate, int quality, TextWriter logger = null)
		{
			if (numChannels <= 0)
			{
				throw new ArgumentOutOfRangeException("numChannels");
			}
			if (ratioNum <= 0)
			{
				throw new ArgumentOutOfRangeException("ratioNum");
			}
			if (ratioDen <= 0)
			{
				throw new ArgumentOutOfRangeException("ratioDen");
			}
			if (inRate <= 0)
			{
				throw new ArgumentOutOfRangeException("inRate");
			}
			if (outRate <= 0)
			{
				throw new ArgumentOutOfRangeException("outRate");
			}
			if (quality < 0 || quality > 10)
			{
				throw new ArgumentOutOfRangeException("quality", "Quality must be between 0 and 10");
			}
			return new SpeexResampler(numChannels, ratioNum, ratioDen, inRate, outRate, quality);
		}
	}
}
namespace Concentus.Silk
{
	internal static class ApplySineWindow
	{
		private static readonly short[] freq_table_Q16 = new short[27]
		{
			12111, 9804, 8235, 7100, 6239, 5565, 5022, 4575, 4202, 3885,
			3612, 3375, 3167, 2984, 2820, 2674, 2542, 2422, 2313, 2214,
			2123, 2038, 1961, 1889, 1822, 1760, 1702
		};

		internal static void silk_apply_sine_window(short[] px_win, int px_win_ptr, short[] px, int px_ptr, int win_type, int length)
		{
			int num = (length >> 2) - 4;
			int num2 = freq_table_Q16[num];
			int num3 = Inlines.silk_SMULWB(num2, -num2);
			int num4;
			int num5;
			if (win_type == 1)
			{
				num4 = 0;
				num5 = num2 + Inlines.silk_RSHIFT(length, 3);
			}
			else
			{
				num4 = 65536;
				num5 = 65536 + Inlines.silk_RSHIFT(num3, 1) + Inlines.silk_RSHIFT(length, 4);
			}
			for (num = 0; num < length; num += 4)
			{
				int num6 = px_win_ptr + num;
				int num7 = px_ptr + num;
				px_win[num6] = (short)Inlines.silk_SMULWB(Inlines.silk_RSHIFT(num4 + num5, 1), px[num7]);
				px_win[num6 + 1] = (short)Inlines.silk_SMULWB(num5, px[num7 + 1]);
				num4 = Inlines.silk_SMULWB(num5, num3) + Inlines.silk_LSHIFT(num5, 1) - num4 + 1;
				num4 = Inlines.silk_min(num4, 65536);
				px_win[num6 + 2] = (short)Inlines.silk_SMULWB(Inlines.silk_RSHIFT(num4 + num5, 1), px[num7 + 2]);
				px_win[num6 + 3] = (short)Inlines.silk_SMULWB(num4, px[num7 + 3]);
				num5 = Inlines.silk_SMULWB(num4, num3) + Inlines.silk_LSHIFT(num4, 1) - num5;
				num5 = Inlines.silk_min(num5, 65536);
			}
		}
	}
	internal static class BurgModified
	{
		private const int MAX_FRAME_SIZE = 384;

		private const int QA = 25;

		private const int N_BITS_HEAD_ROOM = 2;

		private const int MIN_RSHIFTS = -16;

		private const int MAX_RSHIFTS = 7;

		internal static void silk_burg_modified(BoxedValueInt res_nrg, BoxedValueInt res_nrg_Q, int[] A_Q16, short[] x, int x_ptr, int minInvGain_Q30, int subfr_length, int nb_subfr, int D)
		{
			int[] array = new int[16];
			int[] array2 = new int[16];
			int[] array3 = new int[16];
			int[] array4 = new int[17];
			int[] array5 = new int[17];
			int[] array6 = new int[16];
			long num = Inlines.silk_inner_prod16_aligned_64(x, x_ptr, x, x_ptr, subfr_length * nb_subfr);
			int num2 = Inlines.silk_CLZ64(num);
			int num3 = 35 - num2;
			if (num3 > 7)
			{
				num3 = 7;
			}
			if (num3 < -16)
			{
				num3 = -16;
			}
			int num4 = (int)((num3 <= 0) ? Inlines.silk_LSHIFT32((int)num, -num3) : Inlines.silk_RSHIFT64(num, num3));
			array5[0] = (array4[0] = num4 + Inlines.silk_SMMUL(42950, num4) + 1);
			Arrays.MemSetInt(array, 0, 16);
			if (num3 > 0)
			{
				for (int i = 0; i < nb_subfr; i++)
				{
					int num5 = x_ptr + i * subfr_length;
					for (int j = 1; j < D + 1; j++)
					{
						array[j - 1] += (int)Inlines.silk_RSHIFT64(Inlines.silk_inner_prod16_aligned_64(x, num5, x, num5 + j, subfr_length - j), num3);
					}
				}
			}
			else
			{
				for (int i = 0; i < nb_subfr; i++)
				{
					int num5 = x_ptr + i * subfr_length;
					CeltPitchXCorr.pitch_xcorr(x, num5, x, num5 + 1, array6, subfr_length - D, D);
					for (int j = 1; j < D + 1; j++)
					{
						int k = j + subfr_length - D;
						int num6 = 0;
						for (; k < subfr_length; k++)
						{
							num6 = Inlines.MAC16_16(num6, x[num5 + k], x[num5 + k - j]);
						}
						array6[j - 1] += num6;
					}
					for (int j = 1; j < D + 1; j++)
					{
						array[j - 1] += Inlines.silk_LSHIFT32(array6[j - 1], -num3);
					}
				}
			}
			Arrays.MemCopy(array, 0, array2, 0, 16);
			array5[0] = (array4[0] = num4 + Inlines.silk_SMMUL(42950, num4) + 1);
			int num7 = 1073741824;
			int num8 = 0;
			for (int j = 0; j < D; j++)
			{
				int num9;
				int num10;
				if (num3 > -2)
				{
					for (int i = 0; i < nb_subfr; i++)
					{
						int num5 = x_ptr + i * subfr_length;
						int b = -Inlines.silk_LSHIFT32(x[num5 + j], 16 - num3);
						int b2 = -Inlines.silk_LSHIFT32(x[num5 + subfr_length - j - 1], 16 - num3);
						num9 = Inlines.silk_LSHIFT32(x[num5 + j], 9);
						num10 = Inlines.silk_LSHIFT32(x[num5 + subfr_length - j - 1], 9);
						for (int l = 0; l < j; l++)
						{
							array[l] = Inlines.silk_SMLAWB(array[l], b, x[num5 + j - l - 1]);
							array2[l] = Inlines.silk_SMLAWB(array2[l], b2, x[num5 + subfr_length - j + l]);
							int b3 = array3[l];
							num9 = Inlines.silk_SMLAWB(num9, b3, x[num5 + j - l - 1]);
							num10 = Inlines.silk_SMLAWB(num10, b3, x[num5 + subfr_length - j + l]);
						}
						num9 = Inlines.silk_LSHIFT32(-num9, 7 - num3);
						num10 = Inlines.silk_LSHIFT32(-num10, 7 - num3);
						for (int l = 0; l <= j; l++)
						{
							array4[l] = Inlines.silk_SMLAWB(array4[l], num9, x[num5 + j - l]);
							array5[l] = Inlines.silk_SMLAWB(array5[l], num10, x[num5 + subfr_length - j + l - 1]);
						}
					}
				}
				else
				{
					for (int i = 0; i < nb_subfr; i++)
					{
						int num5 = x_ptr + i * subfr_length;
						int b = -Inlines.silk_LSHIFT32(x[num5 + j], -num3);
						int b2 = -Inlines.silk_LSHIFT32(x[num5 + subfr_length - j - 1], -num3);
						num9 = Inlines.silk_LSHIFT32(x[num5 + j], 17);
						num10 = Inlines.silk_LSHIFT32(x[num5 + subfr_length - j - 1], 17);
						for (int l = 0; l < j; l++)
						{
							array[l] = Inlines.silk_MLA(array[l], b, x[num5 + j - l - 1]);
							array2[l] = Inlines.silk_MLA(array2[l], b2, x[num5 + subfr_length - j + l]);
							int c = Inlines.silk_RSHIFT_ROUND(array3[l], 8);
							num9 = Inlines.silk_MLA(num9, x[num5 + j - l - 1], c);
							num10 = Inlines.silk_MLA(num10, x[num5 + subfr_length - j + l], c);
						}
						num9 = -num9;
						num10 = -num10;
						for (int l = 0; l <= j; l++)
						{
							array4[l] = Inlines.silk_SMLAWW(array4[l], num9, Inlines.silk_LSHIFT32(x[num5 + j - l], -num3 - 1));
							array5[l] = Inlines.silk_SMLAWW(array5[l], num10, Inlines.silk_LSHIFT32(x[num5 + subfr_length - j + l - 1], -num3 - 1));
						}
					}
				}
				num9 = array[j];
				num10 = array2[j];
				int a = 0;
				int num11 = Inlines.silk_ADD32(array5[0], array4[0]);
				for (int l = 0; l < j; l++)
				{
					int b3 = array3[l];
					num2 = Inlines.silk_CLZ32(Inlines.silk_abs(b3)) - 1;
					num2 = Inlines.silk_min(7, num2);
					int c = Inlines.silk_LSHIFT32(b3, num2);
					num9 = Inlines.silk_ADD_LSHIFT32(num9, Inlines.silk_SMMUL(array2[j - l - 1], c), 7 - num2);
					num10 = Inlines.silk_ADD_LSHIFT32(num10, Inlines.silk_SMMUL(array[j - l - 1], c), 7 - num2);
					a = Inlines.silk_ADD_LSHIFT32(a, Inlines.silk_SMMUL(array5[j - l], c), 7 - num2);
					num11 = Inlines.silk_ADD_LSHIFT32(num11, Inlines.silk_SMMUL(Inlines.silk_ADD32(array5[l + 1], array4[l + 1]), c), 7 - num2);
				}
				array4[j + 1] = num9;
				array5[j + 1] = num10;
				a = Inlines.silk_ADD32(a, num10);
				a = Inlines.silk_LSHIFT32(-a, 1);
				int num12 = ((Inlines.silk_abs(a) >= num11) ? ((a > 0) ? int.MaxValue : int.MinValue) : Inlines.silk_DIV32_varQ(a, num11, 31));
				num9 = 1073741824 - Inlines.silk_SMMUL(num12, num12);
				num9 = Inlines.silk_LSHIFT(Inlines.silk_SMMUL(num7, num9), 2);
				if (num9 <= minInvGain_Q30)
				{
					num10 = 1073741824 - Inlines.silk_DIV32_varQ(minInvGain_Q30, num7, 30);
					num12 = Inlines.silk_SQRT_APPROX(num10);
					num12 = Inlines.silk_RSHIFT32(num12 + Inlines.silk_DIV32(num10, num12), 1);
					num12 = Inlines.silk_LSHIFT32(num12, 16);
					if (a < 0)
					{
						num12 = -num12;
					}
					num7 = minInvGain_Q30;
					num8 = 1;
				}
				else
				{
					num7 = num9;
				}
				for (int l = 0; l < j + 1 >> 1; l++)
				{
					num9 = array3[l];
					num10 = array3[j - l - 1];
					array3[l] = Inlines.silk_ADD_LSHIFT32(num9, Inlines.silk_SMMUL(num10, num12), 1);
					array3[j - l - 1] = Inlines.silk_ADD_LSHIFT32(num10, Inlines.silk_SMMUL(num9, num12), 1);
				}
				array3[j] = Inlines.silk_RSHIFT32(num12, 6);
				if (num8 != 0)
				{
					for (int l = j + 1; l < D; l++)
					{
						array3[l] = 0;
					}
					break;
				}
				for (int l = 0; l <= j + 1; l++)
				{
					num9 = array4[l];
					num10 = array5[j - l + 1];
					array4[l] = Inlines.silk_ADD_LSHIFT32(num9, Inlines.silk_SMMUL(num10, num12), 1);
					array5[j - l + 1] = Inlines.silk_ADD_LSHIFT32(num10, Inlines.silk_SMMUL(num9, num12), 1);
				}
			}
			if (num8 != 0)
			{
				for (int l = 0; l < D; l++)
				{
					A_Q16[l] = -Inlines.silk_RSHIFT_ROUND(array3[l], 9);
				}
				if (num3 > 0)
				{
					for (int i = 0; i < nb_subfr; i++)
					{
						int num5 = x_ptr + i * subfr_length;
						num4 -= (int)Inlines.silk_RSHIFT64(Inlines.silk_inner_prod16_aligned_64(x, num5, x, num5, D), num3);
					}
				}
				else
				{
					for (int i = 0; i < nb_subfr; i++)
					{
						int num5 = x_ptr + i * subfr_length;
						num4 -= Inlines.silk_LSHIFT32(Inlines.silk_inner_prod_self(x, num5, D), -num3);
					}
				}
				res_nrg.Val = Inlines.silk_LSHIFT(Inlines.silk_SMMUL(num7, num4), 2);
				res_nrg_Q.Val = -num3;
			}
			else
			{
				int num11 = array4[0];
				int num9 = 65536;
				for (int l = 0; l < D; l++)
				{
					int c = Inlines.silk_RSHIFT_ROUND(array3[l], 9);
					num11 = Inlines.silk_SMLAWW(num11, array4[l + 1], c);
					num9 = Inlines.silk_SMLAWW(num9, c, c);
					A_Q16[l] = -c;
				}
				res_nrg.Val = Inlines.silk_SMLAWW(num11, Inlines.silk_SMMUL(42950, num4), -num9);
				res_nrg_Q.Val = -num3;
			}
		}
	}
	internal static class BWExpander
	{
		internal static void silk_bwexpander_32(int[] ar, int d, int chirp_Q16)
		{
			int b = chirp_Q16 - 65536;
			for (int i = 0; i < d - 1; i++)
			{
				ar[i] = Inlines.silk_SMULWW(chirp_Q16, ar[i]);
				chirp_Q16 += Inlines.silk_RSHIFT_ROUND(Inlines.silk_MUL(chirp_Q16, b), 16);
			}
			ar[d - 1] = Inlines.silk_SMULWW(chirp_Q16, ar[d - 1]);
		}

		internal static void silk_bwexpander(short[] ar, int d, int chirp_Q16)
		{
			int b = chirp_Q16 - 65536;
			for (int i = 0; i < d - 1; i++)
			{
				ar[i] = (short)Inlines.silk_RSHIFT_ROUND(Inlines.silk_MUL(chirp_Q16, ar[i]), 16);
				chirp_Q16 += Inlines.silk_RSHIFT_ROUND(Inlines.silk_MUL(chirp_Q16, b), 16);
			}
			ar[d - 1] = (short)Inlines.silk_RSHIFT_ROUND(Inlines.silk_MUL(chirp_Q16, ar[d - 1]), 16);
		}
	}
	internal static class CNG
	{
		internal static void silk_CNG_exc(Span<int> exc_Q10, int exc_Q10_ptr, int[] exc_buf_Q14, int Gain_Q16, int length, ref int rand_seed)
		{
			int num;
			for (num = 255; num > length; num = Inlines.silk_RSHIFT(num, 1))
			{
			}
			int num2 = rand_seed;
			for (int i = exc_Q10_ptr; i < exc_Q10_ptr + length; i++)
			{
				num2 = Inlines.silk_RAND(num2);
				int num3 = Inlines.silk_RSHIFT(num2, 24) & num;
				exc_Q10[i] = (short)Inlines.silk_SAT16(Inlines.silk_SMULWW(exc_buf_Q14[num3], Gain_Q16 >> 4));
			}
			rand_seed = num2;
		}

		internal static void silk_CNG_Reset(SilkChannelDecoder psDec)
		{
			int num = Inlines.silk_DIV32_16(32767, (short)(psDec.LPC_order + 1));
			int num2 = 0;
			for (int i = 0; i < psDec.LPC_order; i++)
			{
				num2 += num;
				psDec.sCNG.CNG_smth_NLSF_Q15[i] = (short)num2;
			}
			psDec.sCNG.CNG_smth_Gain_Q16 = 0;
			psDec.sCNG.rand_seed = 3176576;
		}

		internal static void silk_CNG(SilkChannelDecoder psDec, SilkDecoderControl psDecCtrl, Span<short> frame, int frame_ptr, int length)
		{
			short[] array = new short[psDec.LPC_order];
			CNGState sCNG = psDec.sCNG;
			if (psDec.fs_kHz != sCNG.fs_kHz)
			{
				silk_CNG_Reset(psDec);
				sCNG.fs_kHz = psDec.fs_kHz;
			}
			if (psDec.lossCnt == 0 && psDec.prevSignalType == 0)
			{
				for (int i = 0; i < psDec.LPC_order; i++)
				{
					sCNG.CNG_smth_NLSF_Q15[i] += (short)Inlines.silk_SMULWB(psDec.prevNLSF_Q15[i] - sCNG.CNG_smth_NLSF_Q15[i], 16348);
				}
				int num = 0;
				for (int i = 0; i < psDec.nb_subfr; i++)
				{
					if (psDecCtrl.Gains_Q16[i] > num)
					{
						num = psDecCtrl.Gains_Q16[i];
					}
				}
				Arrays.MemMoveInt(sCNG.CNG_exc_buf_Q14, 0, psDec.subfr_length, (psDec.nb_subfr - 1) * psDec.subfr_length);
				for (int i = 0; i < psDec.nb_subfr; i++)
				{
					sCNG.CNG_smth_Gain_Q16 += Inlines.silk_SMULWB(psDecCtrl.Gains_Q16[i] - sCNG.CNG_smth_Gain_Q16, 4634);
				}
			}
			if (psDec.lossCnt != 0)
			{
				int[] array2 = new int[length + 16];
				int num2 = Inlines.silk_SMULWW(psDec.sPLC.randScale_Q14, psDec.sPLC.prevGain_Q16[1]);
				if (num2 >= 2097152 || sCNG.CNG_smth_Gain_Q16 > 8388608)
				{
					num2 = Inlines.silk_SMULTT(num2, num2);
					num2 = Inlines.silk_SUB_LSHIFT32(Inlines.silk_SMULTT(sCNG.CNG_smth_Gain_Q16, sCNG.CNG_smth_Gain_Q16), num2, 5);
					num2 = Inlines.silk_LSHIFT32(Inlines.silk_SQRT_APPROX(num2), 16);
				}
				else
				{
					num2 = Inlines.silk_SMULWW(num2, num2);
					num2 = Inlines.silk_SUB_LSHIFT32(Inlines.silk_SMULWW(sCNG.CNG_smth_Gain_Q16, sCNG.CNG_smth_Gain_Q16), num2, 5);
					num2 = Inlines.silk_LSHIFT32(Inlines.silk_SQRT_APPROX(num2), 8);
				}
				silk_CNG_exc(array2, 16, sCNG.CNG_exc_buf_Q14, num2, length, ref sCNG.rand_seed);
				NLSF.silk_NLSF2A(array, sCNG.CNG_smth_NLSF_Q15, psDec.LPC_order);
				Arrays.MemCopy(sCNG.CNG_synth_state, 0, array2, 0, 16);
				for (int i = 0; i < length; i++)
				{
					int num3 = 16 + i;
					int a = Inlines.silk_RSHIFT(psDec.LPC_order, 1);
					a = Inlines.silk_SMLAWB(a, array2[num3 - 1], array[0]);
					a = Inlines.silk_SMLAWB(a, array2[num3 - 2], array[1]);
					a = Inlines.silk_SMLAWB(a, array2[num3 - 3], array[2]);
					a = Inlines.silk_SMLAWB(a, array2[num3 - 4], array[3]);
					a = Inlines.silk_SMLAWB(a, array2[num3 - 5], array[4]);
					a = Inlines.silk_SMLAWB(a, array2[num3 - 6], array[5]);
					a = Inlines.silk_SMLAWB(a, array2[num3 - 7], array[6]);
					a = Inlines.silk_SMLAWB(a, array2[num3 - 8], array[7]);
					a = Inlines.silk_SMLAWB(a, array2[num3 - 9], array[8]);
					a = Inlines.silk_SMLAWB(a, array2[num3 - 10], array[9]);
					if (psDec.LPC_order == 16)
					{
						a = Inlines.silk_SMLAWB(a, array2[num3 - 11], array[10]);
						a = Inlines.silk_SMLAWB(a, array2[num3 - 12], array[11]);
						a = Inlines.silk_SMLAWB(a, array2[num3 - 13], array[12]);
						a = Inlines.silk_SMLAWB(a, array2[num3 - 14], array[13]);
						a = Inlines.silk_SMLAWB(a, array2[num3 - 15], array[14]);
						a = Inlines.silk_SMLAWB(a, array2[num3 - 16], array[15]);
					}
					array2[num3] = Inlines.silk_ADD_LSHIFT(array2[num3], a, 4);
					frame[frame_ptr + i] = Inlines.silk_ADD_SAT16(frame[frame_ptr + i], (short)Inlines.silk_RSHIFT_ROUND(array2[num3], 10));
				}
				Arrays.MemCopy(array2, length, sCNG.CNG_synth_state, 0, 16);
			}
			else
			{
				Arrays.MemSetInt(sCNG.CNG_synth_state, 0, psDec.LPC_order);
			}
		}
	}
	internal static class CodeSigns
	{
		private static int silk_enc_map(int a)
		{
			return Inlines.silk_RSHIFT(a, 15) + 1;
		}

		private static int silk_dec_map(int a)
		{
			return Inlines.silk_LSHIFT(a, 1) - 1;
		}

		internal static void silk_encode_signs(EntropyCoder psRangeEnc, Span<byte> encodedData, Span<sbyte> pulses, int length, int signalType, int quantOffsetType, int[] sum_pulses)
		{
			byte[] array = new byte[2];
			byte[] silk_sign_iCDF = Tables.silk_sign_iCDF;
			array[1] = 0;
			int num = 0;
			int num2 = Inlines.silk_SMULBB(7, Inlines.silk_ADD_LSHIFT(quantOffsetType, signalType, 1));
			int num3 = num2;
			length = Inlines.silk_RSHIFT(length + 8, 4);
			for (num2 = 0; num2 < length; num2++)
			{
				int num4 = sum_pulses[num2];
				if (num4 > 0)
				{
					array[0] = silk_sign_iCDF[num3 + Inlines.silk_min(num4 & 0x1F, 6)];
					for (int i = num; i < num + 16; i++)
					{
						if (pulses[i] != 0)
						{
							psRangeEnc.enc_icdf(encodedData, silk_enc_map(pulses[i]), array, 8u);
						}
					}
				}
				num += 16;
			}
		}

		internal static void silk_decode_signs(EntropyCoder psRangeDec, ReadOnlySpan<byte> encodedData, short[] pulses, int length, int signalType, int quantOffsetType, int[] sum_pulses)
		{
			byte[] array = new byte[2];
			byte[] silk_sign_iCDF = Tables.silk_sign_iCDF;
			array[1] = 0;
			int num = 0;
			int num2 = Inlines.silk_SMULBB(7, Inlines.silk_ADD_LSHIFT(quantOffsetType, signalType, 1));
			int num3 = num2;
			length = Inlines.silk_RSHIFT(length + 8, 4);
			for (num2 = 0; num2 < length; num2++)
			{
				int num4 = sum_pulses[num2];
				if (num4 > 0)
				{
					array[0] = silk_sign_iCDF[num3 + Inlines.silk_min(num4 & 0x1F, 6)];
					for (int i = 0; i < 16; i++)
					{
						if (pulses[num + i] > 0)
						{
							pulses[num + i] *= (short)silk_dec_map(psRangeDec.dec_icdf(encodedData, array, 8u));
						}
					}
				}
				num += 16;
			}
		}
	}
	internal static class CorrelateMatrix
	{
		internal static void silk_corrVector(short[] x, int x_ptr, short[] t, int t_ptr, int L, int order, int[] Xt, int rshifts)
		{
			int num = x_ptr + order - 1;
			if (rshifts > 0)
			{
				for (int i = 0; i < order; i++)
				{
					int num2 = 0;
					for (int j = 0; j < L; j++)
					{
						num2 += Inlines.silk_RSHIFT32(Inlines.silk_SMULBB(x[num + j], t[t_ptr + j]), rshifts);
					}
					Xt[i] = num2;
					num--;
				}
			}
			else
			{
				for (int i = 0; i < order; i++)
				{
					Xt[i] = Inlines.silk_inner_prod(x, num, t, t_ptr, L);
					num--;
				}
			}
		}

		internal static void silk_corrMatrix(short[] x, int x_ptr, int L, int order, int head_room, int[] XX, int XX_ptr, BoxedValueInt rshifts)
		{
			SumSqrShift.silk_sum_sqr_shift(out var energy, out var shift, x, x_ptr, L + order - 1);
			int num = Inlines.silk_max(head_room - Inlines.silk_CLZ32(energy), 0);
			energy = Inlines.silk_RSHIFT32(energy, num);
			shift += num;
			for (int i = x_ptr; i < x_ptr + order - 1; i++)
			{
				energy -= Inlines.silk_RSHIFT32(Inlines.silk_SMULBB(x[i], x[i]), shift);
			}
			if (shift < rshifts.Val)
			{
				energy = Inlines.silk_RSHIFT32(energy, rshifts.Val - shift);
				shift = rshifts.Val;
			}
			Inlines.MatrixSet(XX, XX_ptr, 0, 0, order, energy);
			int num2 = x_ptr + order - 1;
			for (int j = 1; j < order; j++)
			{
				energy = Inlines.silk_SUB32(energy, Inlines.silk_RSHIFT32(Inlines.silk_SMULBB(x[num2 + L - j], x[num2 + L - j]), shift));
				energy = Inlines.silk_ADD32(energy, Inlines.silk_RSHIFT32(Inlines.silk_SMULBB(x[num2 - j], x[num2 - j]), shift));
				Inlines.MatrixSet(XX, XX_ptr, j, j, order, energy);
			}
			int num3 = x_ptr + order - 2;
			if (shift > 0)
			{
				for (int k = 1; k < order; k++)
				{
					energy = 0;
					for (int i = 0; i < L; i++)
					{
						energy += Inlines.silk_RSHIFT32(Inlines.silk_SMULBB(x[num2 + i], x[num3 + i]), shift);
					}
					Inlines.MatrixSet(XX, XX_ptr, k, 0, order, energy);
					Inlines.MatrixSet(XX, XX_ptr, 0, k, order, energy);
					for (int j = 1; j < order - k; j++)
					{
						energy = Inlines.silk_SUB32(energy, Inlines.silk_RSHIFT32(Inlines.silk_SMULBB(x[num2 + L - j], x[num3 + L - j]), shift));
						energy = Inlines.silk_ADD32(energy, Inlines.silk_RSHIFT32(Inlines.silk_SMULBB(x[num2 - j], x[num3 - j]), shift));
						Inlines.MatrixSet(XX, XX_ptr, k + j, j, order, energy);
						Inlines.MatrixSet(XX, XX_ptr, j, k + j, order, energy);
					}
					num3--;
				}
			}
			else
			{
				for (int k = 1; k < order; k++)
				{
					energy = Inlines.silk_inner_prod(x, num2, x, num3, L);
					Inlines.MatrixSet(XX, XX_ptr, k, 0, order, energy);
					Inlines.MatrixSet(XX, XX_ptr, 0, k, order, energy);
					for (int j = 1; j < order - k; j++)
					{
						energy = Inlines.silk_SUB32(energy, Inlines.silk_SMULBB(x[num2 + L - j], x[num3 + L - j]));
						energy = Inlines.silk_SMLABB(energy, x[num2 - j], x[num3 - j]);
						Inlines.MatrixSet(XX, XX_ptr, k + j, j, order, energy);
						Inlines.MatrixSet(XX, XX_ptr, j, k + j, order, energy);
					}
					num3--;
				}
			}
			rshifts.Val = shift;
		}
	}
	internal static class DecodeAPI
	{
		internal static int silk_InitDecoder(SilkDecoder decState)
		{
			decState.Reset();
			int result = SilkError.SILK_NO_ERROR;
			SilkChannelDecoder[] channel_state = decState.channel_state;
			for (int i = 0; i < 2; i++)
			{
				result = channel_state[i].silk_init_decoder();
			}
			decState.sStereo.Reset();
			decState.prev_decode_only_middle = 0;
			return result;
		}

		internal static int silk_Decode(SilkDecoder psDec, DecControlState decControl, ReadOnlySpan<byte> frameData, int lostFlag, int newPacketFlag, EntropyCoder psRangeDec, Span<short> samplesOut, int samplesOut_ptr, out int nSamplesOut)
		{
			int num = 0;
			int num2 = SilkError.SILK_NO_ERROR;
			BoxedValueInt boxedValueInt = new BoxedValueInt();
			int[] array = new int[2];
			int[] array2 = new int[2];
			SilkChannelDecoder[] channel_state = psDec.channel_state;
			nSamplesOut = 0;
			if (newPacketFlag != 0)
			{
				for (int i = 0; i < decControl.nChannelsInternal; i++)
				{
					channel_state[i].nFramesDecoded = 0;
				}
			}
			if (decControl.nChannelsInternal > psDec.nChannelsInternal)
			{
				num2 += channel_state[1].silk_init_decoder();
			}
			int num3 = ((decControl.nChannelsInternal == 1 && psDec.nChannelsInternal == 2 && decControl.internalSampleRate == 1000 * channel_state[0].fs_kHz) ? 1 : 0);
			if (channel_state[0].nFramesDecoded == 0)
			{
				for (int i = 0; i < decControl.nChannelsInternal; i++)
				{
					if (decControl.payloadSize_ms == 0)
					{
						channel_state[i].nFramesPerPacket = 1;
						channel_state[i].nb_subfr = 2;
					}
					else if (decControl.payloadSize_ms == 10)
					{
						channel_state[i].nFramesPerPacket = 1;
						channel_state[i].nb_subfr = 2;
					}
					else if (decControl.payloadSize_ms == 20)
					{
						channel_state[i].nFramesPerPacket = 1;
						channel_state[i].nb_subfr = 4;
					}
					else if (decControl.payloadSize_ms == 40)
					{
						channel_state[i].nFramesPerPacket = 2;
						channel_state[i].nb_subfr = 4;
					}
					else
					{
						if (decControl.payloadSize_ms != 60)
						{
							return SilkError.SILK_DEC_INVALID_FRAME_SIZE;
						}
						channel_state[i].nFramesPerPacket = 3;
						channel_state[i].nb_subfr = 4;
					}
					int num4 = (decControl.internalSampleRate >> 10) + 1;
					if (num4 != 8 && num4 != 12 && num4 != 16)
					{
						return SilkError.SILK_DEC_INVALID_SAMPLING_FREQUENCY;
					}
					num2 += channel_state[i].silk_decoder_set_fs(num4, decControl.API_sampleRate);
				}
			}
			if (decControl.nChannelsAPI == 2 && decControl.nChannelsInternal == 2 && (psDec.nChannelsAPI == 1 || psDec.nChannelsInternal == 1))
			{
				Arrays.MemSetShort(psDec.sStereo.pred_prev_Q13, 0, 2);
				Arrays.MemSetShort(psDec.sStereo.sSide, 0, 2);
				channel_state[1].resampler_state.Assign(channel_state[0].resampler_state);
			}
			psDec.nChannelsAPI = decControl.nChannelsAPI;
			psDec.nChannelsInternal = decControl.nChannelsInternal;
			if (decControl.API_sampleRate > 48000 || decControl.API_sampleRate < 8000)
			{
				return SilkError.SILK_DEC_INVALID_SAMPLING_FREQUENCY;
			}
			if (lostFlag != 1 && channel_state[0].nFramesDecoded == 0)
			{
				for (int i = 0; i < decControl.nChannelsInternal; i++)
				{
					for (int j = 0; j < channel_state[i].nFramesPerPacket; j++)
					{
						channel_state[i].VAD_flags[j] = psRangeDec.dec_bit_logp(frameData, 1u);
					}
					channel_state[i].LBRR_flag = psRangeDec.dec_bit_logp(frameData, 1u);
				}
				for (int i = 0; i < decControl.nChannelsInternal; i++)
				{
					Arrays.MemSetInt(channel_state[i].LBRR_flags, 0, 3);
					if (channel_state[i].LBRR_flag == 0)
					{
						continue;
					}
					if (channel_state[i].nFramesPerPacket == 1)
					{
						channel_state[i].LBRR_flags[0] = 1;
						continue;
					}
					int a = psRangeDec.dec_icdf(frameData, Tables.silk_LBRR_flags_iCDF_ptr[channel_state[i].nFramesPerPacket - 2], 8u) + 1;
					for (int j = 0; j < channel_state[i].nFramesPerPacket; j++)
					{
						channel_state[i].LBRR_flags[j] = Inlines.silk_RSHIFT(a, j) & 1;
					}
				}
				if (lostFlag == 0)
				{
					for (int j = 0; j < channel_state[0].nFramesPerPacket; j++)
					{
						for (int i = 0; i < decControl.nChannelsInternal; i++)
						{
							if (channel_state[i].LBRR_flags[j] == 0)
							{
								continue;
							}
							short[] pulses = new short[320];
							if (decControl.nChannelsInternal == 2 && i == 0)
							{
								Stereo.silk_stereo_decode_pred(psRangeDec, frameData, array2);
								if (channel_state[1].LBRR_flags[j] == 0)
								{
									BoxedValueInt boxedValueInt2 = new BoxedValueInt(num);
									Stereo.silk_stereo_decode_mid_only(psRangeDec, frameData, boxedValueInt2);
									num = boxedValueInt2.Val;
								}
							}
							DecodeIndices.silk_decode_indices(condCoding: (j > 0 && channel_state[i].LBRR_flags[j - 1] != 0) ? 2 : 0, psDec: channel_state[i], psRangeDec: psRangeDec, frameData: frameData, FrameIndex: j, decode_LBRR: 1);
							DecodePulses.silk_decode_pulses(psRangeDec, frameData, pulses, channel_state[i].indices.signalType, channel_state[i].indices.quantOffsetType, channel_state[i].frame_length);
						}
					}
				}
			}
			if (decControl.nChannelsInternal == 2)
			{
				if (lostFlag == 0 || (lostFlag == 2 && channel_state[0].LBRR_flags[channel_state[0].nFramesDecoded] == 1))
				{
					Stereo.silk_stereo_decode_pred(psRangeDec, frameData, array2);
					if ((lostFlag == 0 && channel_state[1].VAD_flags[channel_state[0].nFramesDecoded] == 0) || (lostFlag == 2 && channel_state[1].LBRR_flags[channel_state[0].nFramesDecoded] == 0))
					{
						BoxedValueInt boxedValueInt3 = new BoxedValueInt(num);
						Stereo.silk_stereo_decode_mid_only(psRangeDec, frameData, boxedValueInt3);
						num = boxedValueInt3.Val;
					}
					else
					{
						num = 0;
					}
				}
				else
				{
					for (int i = 0; i < 2; i++)
					{
						array2[i] = psDec.sStereo.pred_prev_Q13[i];
					}
				}
			}
			if (decControl.nChannelsInternal == 2 && num == 0 && psDec.prev_decode_only_middle == 1)
			{
				Arrays.MemSetShort(psDec.channel_state[1].outBuf, 0, 480);
				Arrays.MemSetInt(psDec.channel_state[1].sLPC_Q14_buf, 0, 16);
				psDec.channel_state[1].lagPrev = 100;
				psDec.channel_state[1].LastGainIndex = 10;
				psDec.channel_state[1].prevSignalType = 0;
				psDec.channel_state[1].first_frame_after_reset = 1;
			}
			int num5 = ((decControl.internalSampleRate * decControl.nChannelsInternal < decControl.API_sampleRate * decControl.nChannelsAPI) ? 1 : 0);
			Span<short> span;
			if (num5 != 0)
			{
				span = samplesOut;
				array[0] = samplesOut_ptr;
				array[1] = samplesOut_ptr + channel_state[0].frame_length + 2;
			}
			else
			{
				span = new short[decControl.nChannelsInternal * (channel_state[0].frame_length + 2)];
				array[0] = 0;
				array[1] = channel_state[0].frame_length + 2;
			}
			int num6 = ((lostFlag != 0) ? ((psDec.prev_decode_only_middle == 0 || (decControl.nChannelsInternal == 2 && lostFlag == 2 && channel_state[1].LBRR_flags[channel_state[1].nFramesDecoded] == 1)) ? 1 : 0) : ((num == 0) ? 1 : 0));
			for (int i = 0; i < decControl.nChannelsInternal; i++)
			{
				if (i == 0 || num6 != 0)
				{
					int num7 = channel_state[0].nFramesDecoded - i;
					int condCoding2 = ((num7 > 0) ? ((lostFlag == 2) ? ((channel_state[i].LBRR_flags[num7 - 1] != 0) ? 2 : 0) : ((i > 0 && psDec.prev_decode_only_middle != 0) ? 1 : 2)) : 0);
					num2 += channel_state[i].silk_decode_frame(psRangeDec, frameData, span, array[i] + 2, boxedValueInt, lostFlag, condCoding2);
				}
				else
				{
					Arrays.MemSetWithOffset<short>(span, 0, array[i] + 2, boxedValueInt.Val);
				}
				channel_state[i].nFramesDecoded++;
			}
			if (decControl.nChannelsAPI == 2 && decControl.nChannelsInternal == 2)
			{
				Stereo.silk_stereo_MS_to_LR(psDec.sStereo, span, array[0], span, array[1], array2, channel_state[0].fs_kHz, boxedValueInt.Val);
			}
			else
			{
				psDec.sStereo.sMid.AsSpan(0, 2).CopyTo(span.Slice(array[0]));
				span.Slice(array[0] + boxedValueInt.Val, 2).CopyTo(psDec.sStereo.sMid);
			}
			nSamplesOut = Inlines.silk_DIV32(boxedValueInt.Val * decControl.API_sampleRate, Inlines.silk_SMULBB(channel_state[0].fs_kHz, 1000));
			Span<short> output;
			int num8;
			if (decControl.nChannelsAPI == 2)
			{
				output = new short[nSamplesOut];
				num8 = 0;
			}
			else
			{
				output = samplesOut;
				num8 = samplesOut_ptr;
			}
			if (num5 != 0)
			{
				short[] array3 = new short[decControl.nChannelsInternal * (channel_state[0].frame_length + 2)];
				samplesOut.Slice(samplesOut_ptr, decControl.nChannelsInternal * (channel_state[0].frame_length + 2)).CopyTo(array3);
				span = array3;
				array[0] = 0;
				array[1] = channel_state[0].frame_length + 2;
			}
			for (int i = 0; i < Inlines.silk_min(decControl.nChannelsAPI, decControl.nChannelsInternal); i++)
			{
				num2 += Resampler.silk_resampler(channel_state[i].resampler_state, output, num8, span, array[i] + 1, boxedValueInt.Val);
				if (decControl.nChannelsAPI == 2)
				{
					int num9 = samplesOut_ptr + i;
					for (int j = 0; j < nSamplesOut; j++)
					{
						samplesOut[num9 + 2 * j] = output[num8 + j];
					}
				}
			}
			if (decControl.nChannelsAPI == 2 && decControl.nChannelsInternal == 1)
			{
				if (num3 != 0)
				{
					num2 += Resampler.silk_resampler(channel_state[1].resampler_state, output, num8, span, array[0] + 1, boxedValueInt.Val);
					for (int j = 0; j < nSamplesOut; j++)
					{
						samplesOut[samplesOut_ptr + 1 + 2 * j] = output[num8 + j];
					}
				}
				else
				{
					for (int j = 0; j < nSamplesOut; j++)
					{
						samplesOut[samplesOut_ptr + 1 + 2 * j] = samplesOut[samplesOut_ptr + 2 * j];
					}
				}
			}
			if (channel_state[0].prevSignalType == 2)
			{
				int[] array4 = new int[3] { 6, 4, 3 };
				decControl.prevPitchLag = channel_state[0].lagPrev * array4[channel_state[0].fs_kHz - 8 >> 2];
			}
			else
			{
				decControl.prevPitchLag = 0;
			}
			if (lostFlag == 1)
			{
				for (int j = 0; j < psDec.nChannelsInternal; j++)
				{
					psDec.channel_state[j].LastGainIndex = 10;
				}
			}
			else
			{
				psDec.prev_decode_only_middle = num;
			}
			return num2;
		}
	}
	internal static class DecodeCore
	{
		internal static void silk_decode_core(SilkChannelDecoder psDec, SilkDecoderControl psDecCtrl, Span<short> xq, int xq_ptr, short[] pulses)
		{
			int num = 0;
			short[] lTPCoef_Q = psDecCtrl.LTPCoef_Q14;
			short[] array = new short[psDec.ltp_mem_length];
			int[] array2 = new int[psDec.ltp_mem_length + psDec.frame_length];
			int[] array3 = new int[psDec.subfr_length];
			int[] array4 = new int[psDec.subfr_length + 16];
			int num2 = Tables.silk_Quantization_Offsets_Q10[psDec.indices.signalType >> 1][psDec.indices.quantOffsetType];
			int num3 = ((psDec.indices.NLSFInterpCoef_Q2 < 4) ? 1 : 0);
			int seed = psDec.indices.Seed;
			for (int i = 0; i < psDec.frame_length; i++)
			{
				seed = Inlines.silk_RAND(seed);
				psDec.exc_Q14[i] = Inlines.silk_LSHIFT(pulses[i], 14);
				if (psDec.exc_Q14[i] > 0)
				{
					psDec.exc_Q14[i] -= 1280;
				}
				else if (psDec.exc_Q14[i] < 0)
				{
					psDec.exc_Q14[i] += 1280;
				}
				psDec.exc_Q14[i] += num2 << 4;
				if (seed < 0)
				{
					psDec.exc_Q14[i] = -psDec.exc_Q14[i];
				}
				seed = Inlines.silk_ADD32_ovflw(seed, pulses[i]);
			}
			Arrays.MemCopy(psDec.sLPC_Q14_buf, 0, array4, 0, 16);
			int num4 = 0;
			int num5 = xq_ptr;
			int num6 = psDec.ltp_mem_length;
			for (int j = 0; j < psDec.nb_subfr; j++)
			{
				int[] array5 = array3;
				int num7 = 0;
				short[] array6 = psDecCtrl.PredCoef_Q12[j >> 1];
				int num8 = j * 5;
				int num9 = psDec.indices.signalType;
				int b = Inlines.silk_RSHIFT(psDecCtrl.Gains_Q16[j], 6);
				int a = Inlines.silk_INVERSE32_varQ(psDecCtrl.Gains_Q16[j], 47);
				int num10;
				if (psDecCtrl.Gains_Q16[j] != psDec.prev_gain_Q16)
				{
					num10 = Inlines.silk_DIV32_varQ(psDec.prev_gain_Q16, psDecCtrl.Gains_Q16[j], 16);
					for (int i = 0; i < 16; i++)
					{
						array4[i] = Inlines.silk_SMULWW(num10, array4[i]);
					}
				}
				else
				{
					num10 = 65536;
				}
				psDec.prev_gain_Q16 = psDecCtrl.Gains_Q16[j];
				if (psDec.lossCnt != 0 && psDec.prevSignalType == 2 && psDec.indices.signalType != 2 && j < 2)
				{
					Arrays.MemSetWithOffset(lTPCoef_Q, (short)0, num8, 5);
					lTPCoef_Q[num8 + 2] = 4096;
					num9 = 2;
					psDecCtrl.pitchL[j] = psDec.lagPrev;
				}
				if (num9 == 2)
				{
					num = psDecCtrl.pitchL[j];
					if (j == 0 || (j == 2 && num3 != 0))
					{
						int num11 = psDec.ltp_mem_length - num - psDec.LPC_order - 2;
						if (j == 2)
						{
							xq.Slice(xq_ptr, 2 * psDec.subfr_length).CopyTo(psDec.outBuf.AsSpan(psDec.ltp_mem_length));
						}
						Filters.silk_LPC_analysis_filter(array, num11, psDec.outBuf, num11 + j * psDec.subfr_length, array6, 0, psDec.ltp_mem_length - num11, psDec.LPC_order);
						if (j == 0)
						{
							a = Inlines.silk_LSHIFT(Inlines.silk_SMULWB(a, psDecCtrl.LTP_scale_Q14), 2);
						}
						for (int i = 0; i < num + 2; i++)
						{
							array2[num6 - i - 1] = Inlines.silk_SMULWB(a, array[psDec.ltp_mem_length - i - 1]);
						}
					}
					else if (num10 != 65536)
					{
						for (int i = 0; i < num + 2; i++)
						{
							array2[num6 - i - 1] = Inlines.silk_SMULWW(num10, array2[num6 - i - 1]);
						}
					}
				}
				if (num9 == 2)
				{
					int num12 = num6 - num + 2;
					for (int i = 0; i < psDec.subfr_length; i++)
					{
						int a2 = 2;
						a2 = Inlines.silk_SMLAWB(a2, array2[num12], lTPCoef_Q[num8]);
						a2 = Inlines.silk_SMLAWB(a2, array2[num12 - 1], lTPCoef_Q[num8 + 1]);
						a2 = Inlines.silk_SMLAWB(a2, array2[num12 - 2], lTPCoef_Q[num8 + 2]);
						a2 = Inlines.silk_SMLAWB(a2, array2[num12 - 3], lTPCoef_Q[num8 + 3]);
						a2 = Inlines.silk_SMLAWB(a2, array2[num12 - 4], lTPCoef_Q[num8 + 4]);
						num12++;
						array5[num7 + i] = Inlines.silk_ADD_LSHIFT32(psDec.exc_Q14[num4 + i], a2, 1);
						array2[num6] = Inlines.silk_LSHIFT(array5[num7 + i], 1);
						num6++;
					}
				}
				else
				{
					array5 = psDec.exc_Q14;
					num7 = num4;
				}
				for (int i = 0; i < psDec.subfr_length; i++)
				{
					int a3 = Inlines.silk_RSHIFT(psDec.LPC_order, 1);
					a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 1], array6[0]);
					a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 2], array6[1]);
					a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 3], array6[2]);
					a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 4], array6[3]);
					a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 5], array6[4]);
					a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 6], array6[5]);
					a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 7], array6[6]);
					a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 8], array6[7]);
					a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 9], array6[8]);
					a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 10], array6[9]);
					if (psDec.LPC_order == 16)
					{
						a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 11], array6[10]);
						a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 12], array6[11]);
						a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 13], array6[12]);
						a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 14], array6[13]);
						a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 15], array6[14]);
						a3 = Inlines.silk_SMLAWB(a3, array4[16 + i - 16], array6[15]);
					}
					array4[16 + i] = Inlines.silk_ADD_LSHIFT32(array5[num7 + i], a3, 4);
					xq[num5 + i] = (short)Inlines.silk_SAT16(Inlines.silk_RSHIFT_ROUND(Inlines.silk_SMULWW(array4[16 + i], b), 8));
				}
				Arrays.MemCopy(array4, psDec.subfr_length, array4, 0, 16);
				num4 += psDec.subfr_length;
				num5 += psDec.subfr_length;
			}
			Arrays.MemCopy(array4, 0, psDec.sLPC_Q14_buf, 0, 16);
		}
	}
	internal static class DecodeIndices
	{
		internal static void silk_decode_indices(SilkChannelDecoder psDec, EntropyCoder psRangeDec, ReadOnlySpan<byte> frameData, int FrameIndex, int decode_LBRR, int condCoding)
		{
			short[] array = new short[psDec.LPC_order];
			byte[] array2 = new byte[psDec.LPC_order];
			int num = ((decode_LBRR == 0 && psDec.VAD_flags[FrameIndex] == 0) ? psRangeDec.dec_icdf(frameData, Tables.silk_type_offset_no_VAD_iCDF, 8u) : (psRangeDec.dec_icdf(frameData, Tables.silk_type_offset_VAD_iCDF, 8u) + 2));
			psDec.indices.signalType = (sbyte)Inlines.silk_RSHIFT(num, 1);
			psDec.indices.quantOffsetType = (sbyte)(num & 1);
			if (condCoding == 2)
			{
				psDec.indices.GainsIndices[0] = (sbyte)psRangeDec.dec_icdf(frameData, Tables.silk_delta_gain_iCDF, 8u);
			}
			else
			{
				psDec.indices.GainsIndices[0] = (sbyte)Inlines.silk_LSHIFT(psRangeDec.dec_icdf(frameData, Tables.silk_gain_iCDF[psDec.indices.signalType], 8u), 3);
				psDec.indices.GainsIndices[0] += (sbyte)psRangeDec.dec_icdf(frameData, Tables.silk_uniform8_iCDF, 8u);
			}
			for (int i = 1; i < psDec.nb_subfr; i++)
			{
				psDec.indices.GainsIndices[i] = (sbyte)psRangeDec.dec_icdf(frameData, Tables.silk_delta_gain_iCDF, 8u);
			}
			psDec.indices.NLSFIndices[0] = (sbyte)psRangeDec.dec_icdf(frameData, psDec.psNLSF_CB.CB1_iCDF, (psDec.indices.signalType >> 1) * psDec.psNLSF_CB.nVectors, 8u);
			NLSF.silk_NLSF_unpack(array, array2, psDec.psNLSF_CB, psDec.indices.NLSFIndices[0]);
			for (int i = 0; i < psDec.psNLSF_CB.order; i++)
			{
				num = psRangeDec.dec_icdf(frameData, psDec.psNLSF_CB.ec_iCDF, array[i], 8u);
				switch (num)
				{
				case 0:
					num -= psRangeDec.dec_icdf(frameData, Tables.silk_NLSF_EXT_iCDF, 8u);
					break;
				case 8:
					num += psRangeDec.dec_icdf(frameData, Tables.silk_NLSF_EXT_iCDF, 8u);
					break;
				}
				psDec.indices.NLSFIndices[i + 1] = (sbyte)(num - 4);
			}
			if (psDec.nb_subfr =