295 lines
9.6 KiB
C#
295 lines
9.6 KiB
C#
using System;
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using System.Text;
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using System.Collections.Generic;
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namespace BizHawk.Emulation.DiscSystem
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{
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/// <summary>
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/// Contains structural information for the disc broken down into c# data structures for easy interrogation.
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/// This represents a best-effort interpretation of the raw disc image.
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/// You cannot assume a disc can be round-tripped into its original format through this (especially if it came from a format more detailed)
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/// </summary>
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public class DiscStructure
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{
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/// <summary>
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/// Right now support for anything other than 1 session is totally not working
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/// </summary>
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public List<Session> Sessions = new List<Session>();
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/// <summary>
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/// List of Points described by the TOC.
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/// TODO - this is kind of garbage, but... I was using it for Synthesize_SubcodeFromStructure() :/
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/// Really, what it is, is a series of points where the tno/index change. Kind of an agenda. And thats how that function uses it.
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/// Maybe I should rename it something different, or at least comment it
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/// Or, you could look at this as a kind of compressed disc map
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/// </summary>
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public List<TOCPoint> Points;
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/// <summary>
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/// How many sectors in the disc, including the 150 lead-in sectors
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/// </summary>
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public int LengthInSectors;
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/// <summary>
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/// Length (including lead-in) of the disc as a timestamp
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/// </summary>
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public Timestamp FriendlyLength { get { return new Timestamp(LengthInSectors); } }
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/// <summary>
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/// How many bytes of data in the disc (including lead-in). Disc sectors are really 2352 bytes each, so this is LengthInSectors * 2352
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/// </summary>
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public long BinarySize
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{
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get { return LengthInSectors * 2352; }
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}
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/// <summary>
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/// Synthesizes the DiscStructure from a DiscTOCRaw
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/// </summary>
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public class SynthesizeFromDiscTOCRawJob
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{
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public DiscTOCRaw TOCRaw;
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public DiscStructure Result;
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public void Run()
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{
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Result = new DiscStructure();
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Result.Sessions.Add(new Session());
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Track lastTrack = null;
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for (int tnum = TOCRaw.FirstRecordedTrackNumber; tnum <= TOCRaw.LastRecordedTrackNumber; tnum++)
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{
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var ti = TOCRaw.TOCItems[tnum];
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var track = new Track();
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Result.Sessions[0].Tracks.Add(track);
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track.Number = tnum;
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track.Control = ti.Control;
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track.TrackType = ETrackType.Unknown; //not known yet
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track.Start_ABA = ti.LBATimestamp.Sector + 150;
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if (lastTrack != null)
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{
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lastTrack.LengthInSectors = track.Start_ABA - lastTrack.Start_ABA;
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}
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lastTrack = track;
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}
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if(lastTrack != null)
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lastTrack.LengthInSectors = (TOCRaw.LeadoutTimestamp.Sector + 150) - lastTrack.Start_ABA;
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//total length of the disc is counted up to the leadout, including the lead-in.
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//i guess supporting storing the leadout is future work.
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Result.LengthInSectors = TOCRaw.LeadoutTimestamp.Sector;
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}
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}
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/// <summary>
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/// seeks the point immediately before (or equal to) this LBA
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/// </summary>
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public TOCPoint SeekPoint(int lba)
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{
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int aba = lba + 150;
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for(int i=0;i<Points.Count;i++)
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{
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TOCPoint tp = Points[i];
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if (tp.ABA > aba)
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return Points[i - 1];
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}
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return Points[Points.Count - 1];
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}
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/// <summary>
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///
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/// </summary>
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public class TOCPoint
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{
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public int Num;
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public int ABA, TrackNum, IndexNum;
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public Track Track;
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public int ADR;
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public EControlQ Control;
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public int LBA
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{
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get { return ABA - 150; }
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}
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}
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/// <summary>
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/// Generates the Points list from the current logical TOC
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/// </summary>
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public void Synthesize_TOCPointsFromSessions()
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{
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Points = new List<TOCPoint>();
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int num = 0;
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foreach (var ses in Sessions)
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{
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for(int t=0;t<ses.Tracks.Count;t++)
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{
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int tnum = t + 1;
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var track = ses.Tracks[t];
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for(int i=0;i<track.Indexes.Count;i++)
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{
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var index = track.Indexes[i];
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bool repeat = false;
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int aba = index.aba;
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REPEAT:
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var tp = new TOCPoint
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{
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Num = num++,
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ABA = aba,
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TrackNum = track.Number,
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IndexNum = index.Number,
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Track = track,
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ADR = track.ADR,
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Control = track.Control
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};
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//special case!
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//yellow-book says:
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//pre-gap for "first part of a digital data track not containing user data and encoded as a pause"
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//first interval: at least 75 sectors coded as preceding track
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//second interval: at least 150 sectors coded as user data track.
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//TODO - add pause flag tracking to TOCPoint
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//see mednafen's "TODO: Look into how we're supposed to handle subq control field in the four combinations of track types(data/audio)."
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if (tnum != 1 && i == 0 && track.TrackType != ETrackType.Audio && !repeat)
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{
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//NOTE: we dont implement this exactly the same as mednafen, I think my logic is closer to the docs, but who knows, its complicated
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int distance = track.Indexes[i + 1].aba - track.Indexes[i].aba;
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//well, how do we know to apply this logic?
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//we assume the 150 sector pregap is more important. so if thats all there is, theres no 75 sector pregap like the old track
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//if theres a longer pregap, then we generate weird old track pregap to contain the rest.
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if (distance > 150)
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{
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int weirdPregapSize = distance - 150;
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//need a new point. fix the old one
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tp.ADR = Points[Points.Count - 1].ADR;
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tp.Control = Points[Points.Count - 1].Control;
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Points.Add(tp);
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aba += weirdPregapSize;
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repeat = true;
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goto REPEAT;
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}
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}
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Points.Add(tp);
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}
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}
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var tpLeadout = new TOCPoint();
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var lastTrack = ses.Tracks[ses.Tracks.Count - 1];
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tpLeadout.Num = num++;
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tpLeadout.ABA = lastTrack.Indexes[1].aba + lastTrack.LengthInSectors;
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tpLeadout.IndexNum = 0;
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tpLeadout.TrackNum = 100;
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tpLeadout.Track = null; //no leadout track.. now... or ever?
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Points.Add(tpLeadout);
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}
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}
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public class Session
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{
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public int num;
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/// <summary>
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/// All the tracks in the session.. but... Tracks[0] should be "Track 1". So beware of this.
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/// We might should keep this organized as a dictionary as well.
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/// </summary>
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public List<Track> Tracks = new List<Track>();
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//the length of the session (should be the sum of all track lengths)
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public int length_aba;
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public Timestamp FriendlyLength { get { return new Timestamp(length_aba); } }
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}
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public class Track
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{
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/// <summary>
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/// The number of the track (1-indexed)
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/// </summary>
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public int Number;
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/// <summary>
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/// Conceptual track type, not necessarily stored this way anywhere
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/// </summary>
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public ETrackType TrackType;
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/// <summary>
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/// The 'control' properties of the track indicated by the subchannel Q.
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/// While in principle these could vary during the track, illegally (or maybe legally according to weird redbook rules)
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/// they normally don't; they're useful for describing what type of contents the track is.
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/// </summary>
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public EControlQ Control;
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/// <summary>
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/// Well, it seems a track can have an ADR property (used to fill the subchannel Q). This is delivered from a CCD file but may have to be guessed from
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/// </summary>
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public int ADR = 1;
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/// <summary>
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/// All the indexes related to the track. These will be 0-Indexed, but they could be non-consecutive.
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/// </summary>
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public List<Index> Indexes = new List<Index>();
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/// <summary>
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/// a track logically starts at index 1.
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/// so this is the length from this index 1 to the next index 1 (or the end of the disc)
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/// the time before track 1 index 1 is the lead-in and isn't accounted for in any track...
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/// </summary>
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public int LengthInSectors;
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/// <summary>
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/// The beginning ABA of the track (index 1). This isn't well-supported, yet
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/// WHAT? IS THIS NOT AN ABA SOMETIMES?
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/// IS IT THE INDEX 0 OF THE TRACK? THATS FUCKED UP. COMPARE TO TOCRAW ENTRIES. IT SHOULD BE MATCHING THAT
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/// HEY??? SHOULD THIS EVEN BE HERE? YOURE SUPPOSED TO USE THE INDEXES INSTEAD.
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/// WELL, IF WE KEEP THIS THE MEANING SHOULD BE SAME AS INDEX[1].LBA (or ABA) SO BE SURE TO WRITE THAT COMMENT HERE
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/// </summary>
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public int Start_ABA;
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/// <summary>
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/// The length as a timestamp (for accessing as a MM:SS:FF)
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/// </summary>
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public Timestamp FriendlyLength { get { return new Timestamp(LengthInSectors); } }
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}
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public class Index
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{
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public int Number;
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public int aba;
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public int LBA
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{
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get { return aba - 150; }
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set { aba = value + 150; }
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}
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//the length of the section
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//HEY! This is commented out because it is a bad idea.
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//The length of a `section`? (what's a section?) is almost useless, and if you want it, you are probably making an error.
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//public int length_lba;
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//public Cue.Timestamp FriendlyLength { get { return new Cue.Timestamp(length_lba); } }
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}
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public void AnalyzeLengthsFromIndexLengths()
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{
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//this is a little more complex than it looks, because the length of a thing is not determined by summing it
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//but rather by the difference in lbas between start and end
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LengthInSectors = 0;
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foreach (var session in Sessions)
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{
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var firstTrack = session.Tracks[0];
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var lastTrack = session.Tracks[session.Tracks.Count - 1];
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session.length_aba = lastTrack.Indexes[0].aba + lastTrack.LengthInSectors - firstTrack.Indexes[0].aba;
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LengthInSectors += session.length_aba;
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}
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}
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}
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} |