namespace NSpeex
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{
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using System;
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internal class NbCodec
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{
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protected internal float[] awk1;
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protected internal float[] awk2;
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protected internal float[] awk3;
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protected internal int bufSize;
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protected internal int dtx_enabled;
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protected static readonly float[] exc_gain_quant_scal1 = new float[] { -0.35f, 0.05f };
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protected static readonly float[] exc_gain_quant_scal3 = new float[] { -2.79475f, -1.81066f, -1.16985f, -0.848119f, -0.58719f, -0.329818f, -0.063266f, 0.282826f };
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protected internal float[] excBuf;
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protected internal int excIdx;
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protected internal Filters filters = new Filters();
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protected internal int first;
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protected internal int frameSize;
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protected internal float[] frmBuf;
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protected internal int frmIdx;
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protected internal float gamma1;
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protected internal float gamma2;
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protected internal float[] innov;
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protected internal float[] interp_qlpc;
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protected internal float[] interp_qlsp;
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protected internal float lag_factor;
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protected internal float[] lpc;
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protected internal float lpc_floor;
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protected internal int lpcSize;
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protected internal Lsp m_lsp = new Lsp();
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protected internal int max_pitch;
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protected internal float[] mem_sp;
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protected internal int min_pitch;
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protected static readonly int[] NB_FRAME_SIZE = new int[] { 5, 0x2b, 0x77, 160, 220, 300, 0x16c, 0x1ec, 0x4f, 1, 1, 1, 1, 1, 1, 1 };
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protected const int NB_SUBMODE_BITS = 4;
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protected const int NB_SUBMODES = 0x10;
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protected internal int nbSubframes;
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protected internal float[] old_qlsp;
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protected internal float[] pi_gain;
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protected internal float pre_mem;
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protected internal float preemph;
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protected internal float[] qlsp;
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protected internal int subframeSize;
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protected internal int submodeID;
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protected internal SubMode[] submodes;
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protected const float VERY_SMALL = 0f;
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protected internal float voc_m1;
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protected internal float voc_m2;
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protected internal float voc_mean;
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protected internal int voc_offset;
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protected internal int windowSize;
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public NbCodec()
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{
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this.Nbinit();
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}
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private static SubMode[] BuildNbSubModes()
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{
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Ltp3Tap ltp = new Ltp3Tap(Codebook_Constants.gain_cdbk_nb, 7, 7);
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Ltp3Tap tap2 = new Ltp3Tap(Codebook_Constants.gain_cdbk_lbr, 5, 0);
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Ltp3Tap tap3 = new Ltp3Tap(Codebook_Constants.gain_cdbk_lbr, 5, 7);
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Ltp3Tap tap4 = new Ltp3Tap(Codebook_Constants.gain_cdbk_lbr, 5, 7);
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LtpForcedPitch pitch = new LtpForcedPitch();
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NoiseSearch innovation = new NoiseSearch();
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SplitShapeSearch search2 = new SplitShapeSearch(40, 10, 4, Codebook_Constants.exc_10_16_table, 4, 0);
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SplitShapeSearch search3 = new SplitShapeSearch(40, 10, 4, Codebook_Constants.exc_10_32_table, 5, 0);
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SplitShapeSearch search4 = new SplitShapeSearch(40, 5, 8, Codebook_Constants.exc_5_64_table, 6, 0);
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SplitShapeSearch search5 = new SplitShapeSearch(40, 8, 5, Codebook_Constants.exc_8_128_table, 7, 0);
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SplitShapeSearch search6 = new SplitShapeSearch(40, 5, 8, Codebook_Constants.exc_5_256_table, 8, 0);
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SplitShapeSearch search7 = new SplitShapeSearch(40, 20, 2, Codebook_Constants.exc_20_32_table, 5, 0);
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NbLspQuant lspQuant = new NbLspQuant();
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LbrLspQuant quant2 = new LbrLspQuant();
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SubMode[] modeArray = new SubMode[0x10];
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modeArray[1] = new SubMode(0, 1, 0, 0, quant2, pitch, innovation, 0.7f, 0.7f, -1f, 0x2b);
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modeArray[2] = new SubMode(0, 0, 0, 0, quant2, tap2, search2, 0.7f, 0.5f, 0.55f, 0x77);
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modeArray[3] = new SubMode(-1, 0, 1, 0, quant2, tap3, search3, 0.7f, 0.55f, 0.45f, 160);
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modeArray[4] = new SubMode(-1, 0, 1, 0, quant2, tap4, search5, 0.7f, 0.63f, 0.35f, 220);
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modeArray[5] = new SubMode(-1, 0, 3, 0, lspQuant, ltp, search4, 0.7f, 0.65f, 0.25f, 300);
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modeArray[6] = new SubMode(-1, 0, 3, 0, lspQuant, ltp, search6, 0.68f, 0.65f, 0.1f, 0x16c);
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modeArray[7] = new SubMode(-1, 0, 3, 1, lspQuant, ltp, search4, 0.65f, 0.65f, -1f, 0x1ec);
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modeArray[8] = new SubMode(0, 1, 0, 0, quant2, pitch, search7, 0.7f, 0.5f, 0.65f, 0x4f);
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return modeArray;
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}
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protected virtual void Init(int frameSize, int subframeSize, int lpcSize, int bufSize)
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{
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this.first = 1;
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this.frameSize = frameSize;
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this.windowSize = (frameSize * 3) / 2;
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this.subframeSize = subframeSize;
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this.nbSubframes = frameSize / subframeSize;
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this.lpcSize = lpcSize;
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this.bufSize = bufSize;
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this.min_pitch = 0x11;
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this.max_pitch = 0x90;
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this.preemph = 0f;
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this.pre_mem = 0f;
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this.gamma1 = 0.9f;
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this.gamma2 = 0.6f;
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this.lag_factor = 0.01f;
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this.lpc_floor = 1.0001f;
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this.frmBuf = new float[bufSize];
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this.frmIdx = bufSize - this.windowSize;
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this.excBuf = new float[bufSize];
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this.excIdx = bufSize - this.windowSize;
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this.innov = new float[frameSize];
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this.lpc = new float[lpcSize + 1];
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this.qlsp = new float[lpcSize];
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this.old_qlsp = new float[lpcSize];
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this.interp_qlsp = new float[lpcSize];
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this.interp_qlpc = new float[lpcSize + 1];
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this.mem_sp = new float[5 * lpcSize];
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this.pi_gain = new float[this.nbSubframes];
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this.awk1 = new float[lpcSize + 1];
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this.awk2 = new float[lpcSize + 1];
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this.awk3 = new float[lpcSize + 1];
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this.voc_m1 = this.voc_m2 = this.voc_mean = 0f;
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this.voc_offset = 0;
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this.dtx_enabled = 0;
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}
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private void Nbinit()
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{
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this.submodes = BuildNbSubModes();
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this.submodeID = 5;
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this.Init(160, 40, 10, 640);
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}
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public virtual float[] Exc {
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get {
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float[] destinationArray = new float[this.frameSize];
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Array.Copy(this.excBuf, this.excIdx, destinationArray, 0, this.frameSize);
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return destinationArray;
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}
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}
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public virtual int FrameSize {
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get { return this.frameSize; }
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}
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public virtual float[] Innov { get { return this.innov; } }
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public float[] PiGain { get { return this.pi_gain; } }
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}
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}
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