mirror of
https://github.com/claunia/cuetools.net.git
synced 2025-12-16 18:14:25 +00:00
699 lines
20 KiB
C#
699 lines
20 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Text;
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using CUETools.CDImage;
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using CUETools.Codecs;
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using CUETools.Parity;
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using CUETools.AccurateRip;
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namespace CUETools.AccurateRip
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{
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public class CDRepair
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{
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protected int sampleCount;
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protected int finalSampleCount;
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internal Galois galois;
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protected RsDecode rs;
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//protected uint crc;
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protected int[] encodeGx;
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internal int stride;
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internal int laststride;
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internal int stridecount;
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internal int npar;
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public CDRepair(int finalSampleCount, int stride, int npar)
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{
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this.npar = npar;
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this.stride = stride;
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this.finalSampleCount = finalSampleCount;
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sampleCount = 0;
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galois = Galois16.instance;
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rs = new RsDecode16(npar, galois);
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//crc32 = new Crc32();
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//crc = 0xffffffff;
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encodeGx = galois.makeEncodeGxLog(npar);
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laststride = stride + (finalSampleCount * 2) % stride;
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stridecount = (finalSampleCount * 2) / stride - 2; // minus one for leadin and one for leadout
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if ((finalSampleCount * 2 + stride - 1) / stride + npar > galois.Max)
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throw new Exception("invalid stride");
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}
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public CDRepair(CDRepair src)
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: this(src.finalSampleCount, src.stride, src.npar)
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{
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}
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//public unsafe void Write(AudioBuffer sampleBuffer)
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//{
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// throw new Exception("unsupported");
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//}
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//public unsafe void Close()
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//{
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// if (sampleCount != finalSampleCount)
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// throw new Exception("sampleCount != finalSampleCount");
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//}
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public long FinalSampleCount
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{
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get
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{
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return finalSampleCount;
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}
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set
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{
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if (value < 0) // != _toc.Length?
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throw new Exception("invalid FinalSampleCount");
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finalSampleCount = (int)value;
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}
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}
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public int NPAR
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{
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get
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{
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return npar;
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}
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}
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public int Stride
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{
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get
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{
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return stride;
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}
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}
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}
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public class CDRepairEncode : CDRepair
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{
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protected AccurateRipVerify ar;
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public CDRepairEncode(AccurateRipVerify ar, int stride, int npar)
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: base ((int)ar.FinalSampleCount, stride, npar)
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{
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this.ar = ar;
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ar.InitCDRepair(stride, laststride, stridecount, true);
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}
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//private unsafe void ProcessStride(int currentStride, int currentPart, int count, ushort* data)
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//{
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// fixed (uint* crct = Crc32.table)
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// fixed (byte* bpar = parity)
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// fixed (ushort* exp = galois.ExpTbl, log = galois.LogTbl, synptr = syndrome)
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// fixed (int* gx = encodeGx)
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// for (int pos = 0; pos < count; pos++)
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// {
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// ushort* par = (ushort*)bpar;
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// int part = currentPart + pos;
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// ushort* wr = ((ushort*)par) + part * npar;
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// ushort dd = data[pos];
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// //crc = (crc >> 8) ^ crct[(byte)(crc ^ dd)];
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// //crc = (crc >> 8) ^ crct[(byte)(crc ^ (dd >> 8))];
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// if (verify)
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// {
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// ushort* syn = synptr + part * npar;
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// syn[0] ^= dd; // wk += data
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// for (int i = 1; i < npar; i++)
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// syn[i] = (ushort)(dd ^ galois.mulExp(syn[i], i)); // wk = data + wk * α^i
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// }
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// int ib = wr[0] ^ dd;
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// if (ib != 0)
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// {
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// ushort* myexp = exp + log[ib];
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// for (int i = 0; i < npar - 1; i++)
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// wr[i] = (ushort)(wr[i + 1] ^ myexp[gx[i]]);
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// wr[npar - 1] = myexp[gx[npar - 1]];
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// }
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// else
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// {
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// for (int i = 0; i < npar - 1; i++)
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// wr[i] = wr[i + 1];
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// wr[npar - 1] = 0;
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// }
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// }
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//}
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//private unsafe void ProcessStride16(int currentStride, int currentPart, int count, ushort* data)
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//{
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// fixed (uint* crct = Crc32.table)
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// fixed (byte* bpar = parity)
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// fixed (ushort* exp = galois.ExpTbl, log = galois.LogTbl, synptr = syndrome)
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// for (int pos = 0; pos < count; pos++)
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// {
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// ushort* par = (ushort*)bpar;
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// int part = currentPart + pos;
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// ushort* wr = par + part * 16;
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// ushort dd = data[pos];
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// //crc = (crc >> 8) ^ crct[(byte)(crc ^ dd)];
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// //crc = (crc >> 8) ^ crct[(byte)(crc ^ (dd >> 8))];
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// int ib = wr[0] ^ dd;
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// if (ib != 0)
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// {
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// ushort* myexp = exp + log[ib];
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// wr[0] = (ushort)(wr[1] ^ myexp[0x000059f1]);
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// wr[1] = (ushort)(wr[2] ^ myexp[0x0000608f]);
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// wr[2] = (ushort)(wr[3] ^ myexp[0x0000918b]);
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// wr[3] = (ushort)(wr[4] ^ myexp[0x00004487]);
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// wr[4] = (ushort)(wr[5] ^ myexp[0x0000a151]);
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// wr[5] = (ushort)(wr[6] ^ myexp[0x0000c074]);
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// wr[6] = (ushort)(wr[7] ^ myexp[0x00004178]);
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// wr[7] = (ushort)(wr[8] ^ myexp[0x00004730]);
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// wr[8] = (ushort)(wr[9] ^ myexp[0x00004187]);
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// wr[9] = (ushort)(wr[10] ^ myexp[0x0000c092]);
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// wr[10] = (ushort)(wr[11] ^ myexp[0x0000a17e]);
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// wr[11] = (ushort)(wr[12] ^ myexp[0x000044c3]);
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// wr[12] = (ushort)(wr[13] ^ myexp[0x000091d6]);
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// wr[13] = (ushort)(wr[14] ^ myexp[0x000060e9]);
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// wr[14] = (ushort)(wr[15] ^ myexp[0x00005a5a]);
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// wr[15] = myexp[0x00000078];
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// }
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// else
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// {
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// wr[0] = wr[1];
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// wr[1] = wr[2];
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// wr[2] = wr[3];
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// wr[3] = wr[4];
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// wr[4] = wr[5];
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// wr[5] = wr[6];
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// wr[6] = wr[7];
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// wr[7] = wr[8];
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// wr[8] = wr[9];
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// wr[9] = wr[10];
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// wr[10] = wr[11];
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// wr[11] = wr[12];
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// wr[12] = wr[13];
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// wr[13] = wr[14];
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// wr[14] = wr[15];
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// wr[15] = 0;
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// }
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// // syn[i] += data[pos] * α^(n*i)
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// if (verify && dd != 0)
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// {
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// int n = stridecount - currentStride;
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// ushort* syn = synptr + part * 16;
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// syn[0] ^= dd;
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// int idx = log[dd];
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// idx += n; syn[1] ^= exp[(idx & 0xffff) + (idx >> 16)];
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// idx += n; syn[2] ^= exp[(idx & 0xffff) + (idx >> 16)];
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// idx += n; syn[3] ^= exp[(idx & 0xffff) + (idx >> 16)];
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// idx += n; syn[4] ^= exp[(idx & 0xffff) + (idx >> 16)];
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// idx += n; syn[5] ^= exp[(idx & 0xffff) + (idx >> 16)];
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// idx += n; syn[6] ^= exp[(idx & 0xffff) + (idx >> 16)];
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// idx += n; syn[7] ^= exp[(idx & 0xffff) + (idx >> 16)];
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// idx += n; syn[8] ^= exp[(idx & 0xffff) + (idx >> 16)];
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// idx += n; syn[9] ^= exp[(idx & 0xffff) + (idx >> 16)];
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// idx += n; syn[10] ^= exp[(idx & 0xffff) + (idx >> 16)];
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// idx += n; syn[11] ^= exp[(idx & 0xffff) + (idx >> 16)];
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// idx += n; syn[12] ^= exp[(idx & 0xffff) + (idx >> 16)];
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// idx += n; syn[13] ^= exp[(idx & 0xffff) + (idx >> 16)];
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// idx += n; syn[14] ^= exp[(idx & 0xffff) + (idx >> 16)];
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// idx += n; syn[15] ^= exp[(idx & 0xffff) + (idx >> 16)];
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// }
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// }
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//}
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//new public unsafe void Write(AudioBuffer sampleBuffer)
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//{
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// if (!verify && !encode)
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// return;
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// sampleBuffer.Prepare(this);
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// if ((sampleBuffer.ByteLength & 1) != 0 || sampleCount + sampleBuffer.Length > finalSampleCount)
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// throw new Exception("sampleCount > finalSampleCount");
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// fixed (byte* bytes = sampleBuffer.Bytes)
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// {
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// int offs = 0;
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// while (offs < sampleBuffer.Length)
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// {
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// int currentPart = (sampleCount * 2) % stride;
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// int currentStride = (sampleCount * 2) / stride;
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// // Process no more than there is in the buffer, and no more than up to a stride boundary.
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// int copyCount = Math.Min((sampleBuffer.Length - offs) * 2, stride - currentPart);
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// ushort* data = ((ushort*)bytes) + offs * 2;
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// if (currentStride < 2)
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// for (int pos = 0; pos < copyCount; pos++)
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// leadin[sampleCount * 2 + pos] = data[pos];
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// if (currentStride >= stridecount)
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// for (int pos = 0; pos < copyCount; pos++)
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// {
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// int remaining = (finalSampleCount - sampleCount) * 2 - pos - 1;
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// if (remaining < stride + laststride)
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// leadout[remaining] = data[pos];
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// }
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// if (currentStride >= 1 && currentStride <= stridecount)
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// {
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// if (npar == 16)
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// ProcessStride16(currentStride, currentPart, copyCount, data);
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// else if (npar != 8)
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// ProcessStride(currentStride, currentPart, copyCount, data);
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// }
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// sampleCount += copyCount >> 1;
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// offs += copyCount >> 1;
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// }
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// }
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//}
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public unsafe CDRepairFix VerifyParity(byte[] parity2, int actualOffset)
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{
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return VerifyParity(npar, parity2, 0, parity2.Length, actualOffset);
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}
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public AccurateRipVerify AR
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{
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get
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{
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return ar;
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}
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}
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public uint CRC
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{
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get
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{
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return ar.CTDBCRC(0);
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}
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}
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public string TrackCRCs
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{
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get
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{
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var sb = new StringBuilder();
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for (int i = 1; i <= ar.TOC.AudioTracks; i++)
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sb.AppendFormat(" {0:x8}", ar.CTDBCRC(i, 0, stride / 2, laststride / 2));
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return sb.ToString().Substring(1);
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}
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}
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public unsafe bool FindOffset(int npar2, byte[] parity2, int pos, uint expectedCRC, out int actualOffset, out bool hasErrors)
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{
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if (npar2 != npar)
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throw new Exception("npar mismatch");
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if (ar.Position != ar.FinalSampleCount)
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throw new Exception("ar.Position != ar.FinalSampleCount");
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// find offset
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fixed (byte* par2ptr = &parity2[pos])
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fixed (ushort* chT = rs.chienTable)
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{
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ushort* par2 = (ushort*)par2ptr;
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int* _sigma = stackalloc int[npar];
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int* _errpos = stackalloc int[npar];
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int* syn = stackalloc int[npar];
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bool foundOffset = false;
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var arSyndrome = ar.GetSyndrome(npar);
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for (int allowed_errors = 0; allowed_errors < npar / 2 && !foundOffset; allowed_errors++)
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{
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int part2 = 0;
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ushort* wr = par2 + part2 * npar;
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// We can only use offset if Abs(offset * 2) < stride,
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// else we might need to add/remove more than one sample
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// from syndrome calculations, and that would be too difficult
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// and will probably require longer leadin/leadout.
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for (int offset = 1 - stride / 2; offset < stride / 2; offset++)
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{
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int err = 0;
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int part = (part2 + stride - offset * 2) % stride;
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for (int i = 0; i < npar; i++)
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{
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int synI = arSyndrome[part, i];
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// offset < 0
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if (part < -offset * 2)
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{
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synI ^= galois.mulExp(ar.leadin[stride + part], (i * (stridecount - 1)) % galois.Max);
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synI = ar.leadout[laststride - part - 1] ^ galois.mulExp(synI, i);
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}
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// offset > 0
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if (part >= stride - offset * 2)
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{
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synI = galois.divExp(synI ^ ar.leadout[laststride + stride - part - 1], i);
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synI ^= galois.mulExp(ar.leadin[part], (i * (stridecount - 1)) % galois.Max);
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}
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for (int j = 0; j < npar; j++)
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synI = wr[j] ^ galois.mulExp(synI, i);
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syn[i] = synI;
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err |= synI;
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}
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int err_count = err == 0 ? 0 : rs.calcSigmaMBM(_sigma, syn);
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if (err_count == allowed_errors && (err_count == 0 || rs.chienSearch(_errpos, stridecount + npar, err_count, _sigma, chT)))
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{
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actualOffset = offset;
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hasErrors = err_count != 0 || ar.CTDBCRC(-offset) != expectedCRC;
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return true;
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}
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}
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}
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}
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actualOffset = 0;
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hasErrors = true;
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return false;
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}
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public unsafe CDRepairFix VerifyParity(int npar2, byte[] parity2, int pos, int len, int actualOffset)
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{
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if (len != stride * npar * 2)
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throw new Exception("wrong size");
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CDRepairFix fix = new CDRepairFix(this);
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fix.actualOffset = actualOffset;
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fix.correctableErrors = 0;
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fix.hasErrors = false;
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fix.canRecover = true;
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fix.sigma = new int[stride, npar / 2 + 2];
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fix.omega = new int[stride, npar / 2 + 1];
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fix.errpos = new int[stride, npar / 2];
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//fix.erroff = new int[stride, npar / 2];
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fix.errors = new int[stride];
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fixed (byte* par = &parity2[pos])
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fixed (ushort* exp = galois.ExpTbl, log = galois.LogTbl, chT = rs.chienTable)
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fixed (int* sf = fix.sigma, of = fix.omega, ef = fix.errpos)
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{
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int* syn = stackalloc int[npar];
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int offset = fix.actualOffset;
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var arSyndrome = ar.GetSyndrome(npar);
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for (int part = 0; part < stride; part++)
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{
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int part2 = (part + offset * 2 + stride) % stride;
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ushort* wr = (ushort*)par + part2 * npar;
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int err = 0;
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for (int i = 0; i < npar; i++)
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{
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syn[i] = arSyndrome[part, i];
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// offset < 0
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if (part < -offset * 2)
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{
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syn[i] ^= galois.mulExp(ar.leadin[stride + part], (i * (stridecount - 1)) % galois.Max);
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syn[i] = ar.leadout[laststride - part - 1] ^ galois.mulExp(syn[i], i);
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}
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// offset > 0
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if (part >= stride - offset * 2)
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{
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syn[i] = galois.divExp(syn[i] ^ ar.leadout[laststride + stride - part - 1], i);
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syn[i] ^= galois.mulExp(ar.leadin[part], (i * (stridecount - 1)) % galois.Max);
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}
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//syn[i] = galois.mulExp(syn[i], i * npar);
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for (int j = 0; j < npar; j++)
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syn[i] = wr[j] ^ galois.mulExp(syn[i], i); // wk = data + wk * α^i
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err |= syn[i];
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}
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//for (int j = 0; j < npar; j++)
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// if (wr[j] != 0)
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// {
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// ushort* myexp = exp + log[wr[j]];
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// syn[0] ^= wr[j];
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// for (int i = 1; i < npar; i++)
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// syn[i] ^= myexp[(npar - j - 1) * i];
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// }
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//for (int i = 0; i < npar; i++)
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// err |= syn[i];
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if (err != 0)
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{
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int* s = sf + part * fix.sigma.GetLength(1);
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int* o = of + part * fix.omega.GetLength(1);
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int* e = ef + part * fix.errpos.GetLength(1);
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//fixed (int* s = &fix.sigma[part, 0], o = &fix.omega[part, 0], e = &fix.errpos[part, 0])
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{
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fix.errors[part] = rs.calcSigmaMBM(s, syn);
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fix.hasErrors = true;
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fix.correctableErrors += fix.errors[part];
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if (fix.errors[part] <= 0 || !rs.chienSearch(e, stridecount + npar, fix.errors[part], s, chT))
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fix.canRecover = false;
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else
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galois.mulPoly(o, s, syn, npar / 2 + 1, npar, npar);
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}
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}
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else
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fix.errors[part] = 0;
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}
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}
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return fix;
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}
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public string OffsetSafeCRC
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{
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get
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{
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return ar.OffsetSafeCRC.Base64;
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}
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}
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public ushort[,] Syndrome
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{
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get
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{
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return this.ar.GetSyndrome(this.npar);
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}
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}
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public byte[] Parity
|
||
{
|
||
get
|
||
{
|
||
return this.ar.GetParity(this.npar);
|
||
}
|
||
}
|
||
}
|
||
|
||
public class CDRepairFix : CDRepair, IAudioDest
|
||
{
|
||
internal bool hasErrors = false, canRecover = true;
|
||
internal int actualOffset = 0;
|
||
internal int correctableErrors = 0;
|
||
internal int[,] sigma;
|
||
internal int[,] omega;
|
||
internal int[,] errpos;
|
||
internal int[] erroffsorted;
|
||
internal ushort[] forneysorted;
|
||
internal int erroffcount;
|
||
internal int[] errors;
|
||
private BitArray affectedSectorArray;
|
||
private int nexterroff;
|
||
uint crc = 0;
|
||
|
||
internal CDRepairFix(CDRepairEncode decode)
|
||
: base(decode)
|
||
{
|
||
}
|
||
|
||
public string AffectedSectors
|
||
{
|
||
get
|
||
{
|
||
StringBuilder sb = new StringBuilder();
|
||
SortErrors();
|
||
for (int i = 0; i < erroffcount; i++)
|
||
{
|
||
int j;
|
||
for (j = i + 1; j < erroffcount; j++)
|
||
if (erroffsorted[j] - erroffsorted[j - 1] > 2 * 588 * 5)
|
||
break;
|
||
uint sec1 = (uint)erroffsorted[i] / 2 / 588;
|
||
uint sec2 = (uint)erroffsorted[j - 1] / 2 / 588;
|
||
if (sb.Length != 0) sb.Append(",");
|
||
sb.Append(CDImageLayout.TimeToString(sec1));
|
||
if (sec1 != sec2) sb.Append("-");
|
||
if (sec1 != sec2) sb.Append(CDImageLayout.TimeToString(sec2));
|
||
i = j - 1;
|
||
}
|
||
return sb.ToString();
|
||
}
|
||
}
|
||
|
||
public BitArray AffectedSectorArray
|
||
{
|
||
get
|
||
{
|
||
if (affectedSectorArray == null)
|
||
{
|
||
affectedSectorArray = new BitArray(finalSampleCount / 588 + 1);
|
||
SortErrors();
|
||
for (int i = 0; i < erroffcount; i++)
|
||
affectedSectorArray[erroffsorted[i] / 2 / 588] = true;
|
||
}
|
||
return affectedSectorArray;
|
||
}
|
||
}
|
||
|
||
private int GetErrOff(int part, int i)
|
||
{
|
||
return (2 + galois.toPos(stridecount + npar, errpos[part, i]) - (stride + part + ActualOffset * 2) / stride) * stride + part;
|
||
}
|
||
|
||
private unsafe void SortErrors()
|
||
{
|
||
if (erroffsorted != null)
|
||
return;
|
||
erroffcount = 0;
|
||
erroffsorted = new int[errpos.GetLength(0) * errpos.GetLength(1)];
|
||
forneysorted = new ushort[errpos.GetLength(0) * errpos.GetLength(1)];
|
||
for (int part = 0; part < stride; part++)
|
||
{
|
||
fixed (int* s = &sigma[part, 0], o = &omega[part, 0])
|
||
for (int i = 0; i < errors[part]; i++)
|
||
{
|
||
erroffsorted[erroffcount] = GetErrOff(part, i);
|
||
if (erroffsorted[erroffcount] >= 0 && erroffsorted[erroffcount] < finalSampleCount * 2)
|
||
{
|
||
forneysorted[erroffcount] = (ushort)rs.doForney(errors[part], errpos[part, i], s, o);
|
||
erroffcount++;
|
||
}
|
||
}
|
||
}
|
||
Array.Sort<int, ushort>(erroffsorted, forneysorted, 0, erroffcount);
|
||
// assert erroffcount == CorrectableErrors
|
||
nexterroff = 0;
|
||
}
|
||
|
||
public unsafe void Write(AudioBuffer sampleBuffer)
|
||
{
|
||
sampleBuffer.Prepare(this);
|
||
|
||
if ((sampleBuffer.ByteLength & 1) != 0)
|
||
throw new Exception("never happens");
|
||
|
||
int firstPos = Math.Max(0, stride - sampleCount * 2 - ActualOffset * 2);
|
||
int lastPos = Math.Min(sampleBuffer.ByteLength >> 1, (finalSampleCount - sampleCount) * 2 - laststride - ActualOffset * 2);
|
||
|
||
SortErrors();
|
||
|
||
fixed (byte* bytes = sampleBuffer.Bytes)
|
||
fixed (uint* t = Crc32.table)
|
||
{
|
||
ushort* data = (ushort*)bytes;
|
||
for (int pos = firstPos; pos < lastPos; pos++)
|
||
{
|
||
if (sampleCount * 2 + pos == erroffsorted[nexterroff] && nexterroff < erroffsorted.Length)
|
||
data[pos] ^= forneysorted[nexterroff++];
|
||
|
||
ushort dd = data[pos];
|
||
crc = (crc >> 8) ^ t[(byte)(crc ^ dd)];
|
||
crc = (crc >> 8) ^ t[(byte)(crc ^ (dd >> 8))];
|
||
}
|
||
}
|
||
sampleCount += sampleBuffer.Length;
|
||
}
|
||
|
||
public unsafe void Close()
|
||
{
|
||
if (sampleCount != finalSampleCount)
|
||
throw new Exception("sampleCount != finalSampleCount");
|
||
}
|
||
|
||
public bool HasErrors
|
||
{
|
||
get
|
||
{
|
||
return hasErrors;
|
||
}
|
||
}
|
||
|
||
public bool CanRecover
|
||
{
|
||
get
|
||
{
|
||
return canRecover;
|
||
}
|
||
}
|
||
|
||
public int CorrectableErrors
|
||
{
|
||
get
|
||
{
|
||
return correctableErrors;
|
||
}
|
||
}
|
||
|
||
public int ActualOffset
|
||
{
|
||
get
|
||
{
|
||
return actualOffset;
|
||
}
|
||
}
|
||
|
||
public uint CRC
|
||
{
|
||
get
|
||
{
|
||
return 0xffffffff ^ Crc32.Combine(0xffffffff, crc, stride * stridecount * 2);
|
||
}
|
||
}
|
||
|
||
public void Delete()
|
||
{
|
||
throw new Exception("unsupported");
|
||
}
|
||
|
||
public int CompressionLevel
|
||
{
|
||
get { return 0; }
|
||
set { }
|
||
}
|
||
|
||
public object Settings
|
||
{
|
||
get
|
||
{
|
||
return null;
|
||
}
|
||
set
|
||
{
|
||
if (value != null && value.GetType() != typeof(object))
|
||
throw new Exception("Unsupported options " + value);
|
||
}
|
||
}
|
||
|
||
public long Padding
|
||
{
|
||
set { }
|
||
}
|
||
|
||
public AudioPCMConfig PCM
|
||
{
|
||
get { return AudioPCMConfig.RedBook; }
|
||
}
|
||
|
||
public long BlockSize
|
||
{
|
||
set { throw new Exception("unsupported"); }
|
||
}
|
||
|
||
public string Path
|
||
{
|
||
get { throw new Exception("unsupported"); }
|
||
}
|
||
}
|
||
}
|