namespace NSpeex
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{
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using System;
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using System.Runtime.InteropServices;
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public class SpeexDecoder
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{
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private readonly Bits bits = new Bits();
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private float[] decodedData;
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private readonly IDecoder decoder;
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private readonly int frameSize;
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private readonly int sampleRate;
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public SpeexDecoder(BandMode mode, bool enhanced = true)
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{
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switch (mode)
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{
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case BandMode.Wide:
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this.decoder = new SbDecoder(false);
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this.sampleRate = 0x3e80;
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break;
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default:
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this.decoder = new NbDecoder();
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this.sampleRate = 0x1f40;
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break;
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}
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this.decoder.PerceptualEnhancement = enhanced;
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this.frameSize = this.decoder.FrameSize;
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this.decodedData = new float[this.sampleRate * 2];
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}
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private static short ConvertToShort(float value)
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{
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if (value > 32767f)
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{
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value = 32767f;
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}
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else if (value < -32768f)
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{
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value = -32768f;
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}
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return (short)Math.Round((double)value);
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}
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public int Decode(byte[] inData, int inOffset, int inCount, short[] outData, int outOffset, bool lostFrame)
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{
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if (this.decodedData.Length < (outData.Length * 2))
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{
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this.decodedData = new float[outData.Length * 2];
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}
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if (lostFrame || (inData == null))
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{
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this.decoder.Decode(null, this.decodedData);
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int index = 0;
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while (index < this.frameSize)
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{
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outData[outOffset] = ConvertToShort(this.decodedData[index]);
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index++;
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outOffset++;
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}
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return this.frameSize;
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}
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this.bits.ReadFrom(inData, inOffset, inCount);
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int num2 = 0;
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while (this.decoder.Decode(this.bits, this.decodedData) == 0)
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{
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int num3 = 0;
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while (num3 < this.frameSize)
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{
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outData[outOffset] = ConvertToShort(this.decodedData[num3]);
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num3++;
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outOffset++;
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}
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num2 += this.frameSize;
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}
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return num2;
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}
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}
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}
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