150 lines
4.2 KiB
C#
150 lines
4.2 KiB
C#
using System;
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using System.IO;
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using System.Collections.Generic;
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namespace BizHawk.Emulation.DiscSystem
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{
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partial class CUE_Format2
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{
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abstract class SS_Base : ISectorSynthJob2448
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{
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public IBlob Blob;
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public long BlobOffset;
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public SubchannelQ sq;
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public bool Pause;
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public abstract void Synth(SectorSynthJob job);
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protected void SynthSubcode(SectorSynthJob job)
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{
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//synth P if needed
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if ((job.Parts & ESectorSynthPart.SubchannelP) != 0)
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{
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SynthUtils.SubP(job.DestBuffer2448, job.DestOffset + 2352, Pause);
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}
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//synth Q if needed
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if ((job.Parts & ESectorSynthPart.SubchannelQ) != 0)
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{
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var subcode = new BufferedSubcodeSector();
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subcode.Synthesize_SubchannelQ(ref sq, true);
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Buffer.BlockCopy(subcode.SubcodeDeinterleaved, 12, job.DestBuffer2448, job.DestOffset + 2352 + 12, 12);
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}
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//clear R-W if needed
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if ((job.Parts & ESectorSynthPart.Subchannel_RSTUVW) != 0)
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{
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Array.Clear(job.DestBuffer2448, job.DestOffset + 2352 + 12 + 12, (12 * 6));
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}
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//subcode has been generated deinterleaved; we may still need to interleave it
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if ((job.Parts & (ESectorSynthPart.SubcodeDeinterleave)) == 0)
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{
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SubcodeUtils.InterleaveInplace(job.DestBuffer2448, job.DestOffset + 2352);
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}
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}
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}
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static class SynthUtils
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{
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public static void SubP(byte[] buffer, int offset, bool pause)
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{
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byte val = (byte)(pause?0xFF:0x00);
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for (int i = 0; i < 12; i++)
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buffer[offset + i] = val;
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}
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public static void SectorHeader(byte[] buffer, int offset, int LBA, byte mode)
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{
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buffer[offset + 0] = 0x00;
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for (int i = 1; i < 11; i++) buffer[offset + i] = 0xFF;
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buffer[offset + 11] = 0x00;
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Timestamp ts = new Timestamp(LBA + 150);
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buffer[offset + 12] = BCD2.IntToBCD(ts.MIN);
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buffer[offset + 13] = BCD2.IntToBCD(ts.SEC);
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buffer[offset + 14] = BCD2.IntToBCD(ts.FRAC);
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buffer[offset + 15] = mode;
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}
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/// <summary>
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/// Make sure everything else in the sector userdata is done before calling this
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/// </summary>
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public static void ECM_Mode1(byte[] buffer, int offset, int LBA)
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{
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//EDC
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uint edc = ECM.EDC_Calc(buffer, offset, 2064);
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ECM.PokeUint(buffer, 2064, edc);
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//reserved, zero
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for (int i = 0; i < 8; i++) buffer[offset + 2068 + i] = 0;
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//ECC
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ECM.ECC_Populate(buffer, offset, buffer, offset, false);
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}
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}
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/// <summary>
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/// Represents a Mode1 2048-byte sector
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/// </summary>
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class SS_Mode1_2048 : SS_Base
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{
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public override void Synth(SectorSynthJob job)
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{
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//read the sector user data
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if((job.Parts & ESectorSynthPart.User2048) != 0)
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Blob.Read(BlobOffset, job.DestBuffer2448, job.DestOffset + 16, 2048);
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if ((job.Parts & ESectorSynthPart.Header16) != 0)
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SynthUtils.SectorHeader(job.DestBuffer2448, job.DestOffset + 0, job.LBA, 1);
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if ((job.Parts & ESectorSynthPart.ECMAny) != 0)
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SynthUtils.ECM_Mode1(job.DestBuffer2448, job.DestOffset + 0, job.LBA);
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SynthSubcode(job);
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}
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}
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/// <summary>
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/// Represents a data pregap or postgap sector.
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/// The Pause flag isn't set in here because it might need special logic varying between sectors and so that's setup by the cue loader
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/// Implemented as another sector type with a blob reading all zeros
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/// </summary>
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class SS_DataGap : SS_Mode1_2048
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{
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public SS_DataGap()
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{
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Blob = new Disc.Blob_Zeros();
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}
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}
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/// <summary>
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/// Represents an audio pregap or postgap sector.
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/// The Pause flag isn't set in here because it might need special logic varying between sectors and so that's setup by the cue loader
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/// Implemented as another sector type with a blob reading all zeros
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/// </summary>
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class SS_AudioGap : SS_2352
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{
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public SS_AudioGap()
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{
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Blob = new Disc.Blob_Zeros();
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}
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}
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/// <summary>
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/// Represents a Mode1 or Mode2 2352-byte sector
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/// </summary>
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class SS_2352 : SS_Base
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{
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public override void Synth(SectorSynthJob job)
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{
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//read the sector user data
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Blob.Read(BlobOffset, job.DestBuffer2448, job.DestOffset, 2352);
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//if subcode is needed, synthesize it
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SynthSubcode(job);
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}
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}
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}
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} |