mirror of
https://github.com/aaru-dps/RedBookPlayer.git
synced 2025-12-16 19:24:41 +00:00
Redefine subchannel data for later (nw)
This commit is contained in:
Matt Nadareski
@@ -1332,55 +1332,6 @@ namespace RedBookPlayer.Models.Hardware
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#region Helpers
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/// <summary>
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/// Reformat raw subchannel data for a single sector
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/// </summary>
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/// <param name="subchannelData">Raw subchannel data to format</param>
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/// <returns>Dictionary mapping subchannel to formatted data</returns>
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public Dictionary<char, byte[]> ConvertSingleSubchannel(byte[] subchannelData)
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{
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if(subchannelData == null || subchannelData.Length != 96)
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return null;
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// Create the output dictionary for the formatted data
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Dictionary<char, byte[]> formattedData = new Dictionary<char, byte[]>
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{
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['P'] = new byte[12],
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['Q'] = new byte[12],
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['R'] = new byte[12],
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['S'] = new byte[12],
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['T'] = new byte[12],
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['U'] = new byte[12],
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['V'] = new byte[12],
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['W'] = new byte[12],
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};
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// Loop through all bytes in the subchannel data and populate
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int index = -1;
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for(int i = 0; i < 96; i++)
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{
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// Get the modulo value of the current byte
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int modValue = i % 8;
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if(modValue == 0)
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index++;
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// Retrieve the next byte
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byte b = subchannelData[i];
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// Set the respective bit in the new byte data
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formattedData['P'][index] |= (byte)(HasBitSet(b, 7) ? 1 << (7 - modValue) : 0);
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formattedData['Q'][index] |= (byte)(HasBitSet(b, 6) ? 1 << (7 - modValue) : 0);
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formattedData['R'][index] |= (byte)(HasBitSet(b, 5) ? 1 << (7 - modValue) : 0);
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formattedData['S'][index] |= (byte)(HasBitSet(b, 4) ? 1 << (7 - modValue) : 0);
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formattedData['T'][index] |= (byte)(HasBitSet(b, 3) ? 1 << (7 - modValue) : 0);
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formattedData['U'][index] |= (byte)(HasBitSet(b, 2) ? 1 << (7 - modValue) : 0);
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formattedData['V'][index] |= (byte)(HasBitSet(b, 1) ? 1 << (7 - modValue) : 0);
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formattedData['W'][index] |= (byte)(HasBitSet(b, 0) ? 1 << (7 - modValue) : 0);
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}
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return formattedData;
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}
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/// <summary>
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/// Reformat raw subchannel data for multiple sectors
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/// </summary>
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@@ -1395,14 +1346,14 @@ namespace RedBookPlayer.Models.Hardware
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int modValue = subchannelData.Length / 96;
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Dictionary<char, byte[]> formattedData = new Dictionary<char, byte[]>
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{
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['P'] = new byte[12 * modValue],
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['Q'] = new byte[12 * modValue],
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['R'] = new byte[12 * modValue],
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['S'] = new byte[12 * modValue],
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['T'] = new byte[12 * modValue],
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['U'] = new byte[12 * modValue],
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['V'] = new byte[12 * modValue],
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['W'] = new byte[12 * modValue],
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['P'] = new byte[8 * modValue],
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['Q'] = new byte[8 * modValue],
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['R'] = new byte[8 * modValue],
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['S'] = new byte[8 * modValue],
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['T'] = new byte[8 * modValue],
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['U'] = new byte[8 * modValue],
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['V'] = new byte[8 * modValue],
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['W'] = new byte[8 * modValue],
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};
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// Read in 96-byte chunks
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@@ -1410,29 +1361,22 @@ namespace RedBookPlayer.Models.Hardware
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{
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byte[] buffer = new byte[96];
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Array.Copy(subchannelData, i * 96, buffer, 0, 96);
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Dictionary<char, byte[]> singleData = ConvertSingleSubchannel(buffer);
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var singleSubchannel = new SubchannelData(buffer);
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Dictionary<char, byte[]> singleData = singleSubchannel.ConvertData();
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Array.Copy(singleData['P'], 0, formattedData['P'], 12 * i, 12);
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Array.Copy(singleData['Q'], 0, formattedData['Q'], 12 * i, 12);
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Array.Copy(singleData['R'], 0, formattedData['R'], 12 * i, 12);
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Array.Copy(singleData['S'], 0, formattedData['S'], 12 * i, 12);
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Array.Copy(singleData['T'], 0, formattedData['T'], 12 * i, 12);
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Array.Copy(singleData['U'], 0, formattedData['U'], 12 * i, 12);
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Array.Copy(singleData['V'], 0, formattedData['V'], 12 * i, 12);
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Array.Copy(singleData['W'], 0, formattedData['W'], 12 * i, 12);
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Array.Copy(singleData['P'], 0, formattedData['P'], 8 * i, 8);
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Array.Copy(singleData['Q'], 0, formattedData['Q'], 8 * i, 8);
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Array.Copy(singleData['R'], 0, formattedData['R'], 8 * i, 8);
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Array.Copy(singleData['S'], 0, formattedData['S'], 8 * i, 8);
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Array.Copy(singleData['T'], 0, formattedData['T'], 8 * i, 8);
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Array.Copy(singleData['U'], 0, formattedData['U'], 8 * i, 8);
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Array.Copy(singleData['V'], 0, formattedData['V'], 8 * i, 8);
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Array.Copy(singleData['W'], 0, formattedData['W'], 8 * i, 8);
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}
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return formattedData;
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}
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/// <summary>
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/// Check if a bit is set in a byte
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/// </summary>
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/// <param name="value">Byte value to check</param>
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/// <param name="bitIndex">Index of the bit to check</param>
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/// <returns>True if the bit was set, false otherwise</returns>
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private bool HasBitSet(byte value, int bitIndex) => (value & (1 << bitIndex)) != 0;
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#endregion
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}
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}
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69
RedBookPlayer.Models/Hardware/SubchannelData.cs
Normal file
69
RedBookPlayer.Models/Hardware/SubchannelData.cs
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@@ -0,0 +1,69 @@
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using System;
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using System.Collections.Generic;
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namespace RedBookPlayer.Models.Hardware
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{
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/// <summary>
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/// Represents subchannel data for a single sector
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/// </summary>
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/// <see cref="https://jbum.com/cdg_revealed.html"/>
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internal class SubchannelData
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{
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public SubchannelPacket[] Packets { get; private set; } = new SubchannelPacket[4];
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/// <summary>
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/// Create a new subchannel data from a byte array
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/// </summary>
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public SubchannelData(byte[] bytes)
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{
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if(bytes == null || bytes.Length != 96)
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return;
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byte[] buffer = new byte[24];
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for(int i = 0; i < 4; i++)
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{
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Array.Copy(bytes, 24 * i, buffer, 0, 24);
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Packets[i] = new SubchannelPacket(buffer);
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}
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}
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/// <summary>
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/// Convert the packet data into separate named subchannels
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/// </summary>
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public Dictionary<char, byte[]> ConvertData()
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{
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if(this.Packets == null || this.Packets.Length != 4)
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return null;
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// Prepare the output formatted data
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Dictionary<char, byte[]> formattedData = new Dictionary<char, byte[]>
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{
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['P'] = new byte[8],
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['Q'] = new byte[8],
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['R'] = new byte[8],
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['S'] = new byte[8],
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['T'] = new byte[8],
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['U'] = new byte[8],
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['V'] = new byte[8],
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['W'] = new byte[8],
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};
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// Loop through all subchannel packets
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for(int i = 0; i < 4; i++)
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{
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Dictionary<char, byte[]> singleData = Packets[i].ConvertData();
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Array.Copy(singleData['P'], 0, formattedData['P'], 2 * i, 2);
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Array.Copy(singleData['Q'], 0, formattedData['Q'], 2 * i, 2);
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Array.Copy(singleData['R'], 0, formattedData['R'], 2 * i, 2);
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Array.Copy(singleData['S'], 0, formattedData['S'], 2 * i, 2);
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Array.Copy(singleData['T'], 0, formattedData['T'], 2 * i, 2);
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Array.Copy(singleData['U'], 0, formattedData['U'], 2 * i, 2);
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Array.Copy(singleData['V'], 0, formattedData['V'], 2 * i, 2);
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Array.Copy(singleData['W'], 0, formattedData['W'], 2 * i, 2);
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}
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return formattedData;
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}
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}
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}
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89
RedBookPlayer.Models/Hardware/SubchannelPacket.cs
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89
RedBookPlayer.Models/Hardware/SubchannelPacket.cs
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@@ -0,0 +1,89 @@
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using System;
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using System.Collections.Generic;
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namespace RedBookPlayer.Models.Hardware
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{
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/// <summary>
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/// Represents a single packet of subcode data
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/// </summary>
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/// <see cref="https://jbum.com/cdg_revealed.html"/>
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internal class SubchannelPacket
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{
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public byte Command { get; private set; }
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public byte Instruction { get; private set; }
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public byte[] ParityQ { get; private set; } = new byte[2];
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public byte[] Data { get; private set; } = new byte[16];
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public byte[] ParityP { get; private set; } = new byte[4];
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/// <summary>
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/// Create a new subchannel packet from a byte array
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/// </summary>
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public SubchannelPacket(byte[] bytes)
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{
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if(bytes == null || bytes.Length != 24)
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return;
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this.Command = bytes[0];
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this.Instruction = bytes[1];
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Array.Copy(bytes, 2, this.ParityQ, 0, 2);
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Array.Copy(bytes, 4, this.Data, 0, 16);
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Array.Copy(bytes, 20, this.ParityP, 0, 4);
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}
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/// <summary>
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/// Convert the data into separate named subchannels
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/// </summary>
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public Dictionary<char, byte[]> ConvertData()
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{
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if(this.Data == null || this.Data.Length != 16)
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return null;
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// Create the output dictionary for the formatted data
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Dictionary<char, byte[]> formattedData = new Dictionary<char, byte[]>
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{
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['P'] = new byte[2],
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['Q'] = new byte[2],
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['R'] = new byte[2],
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['S'] = new byte[2],
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['T'] = new byte[2],
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['U'] = new byte[2],
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['V'] = new byte[2],
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['W'] = new byte[2],
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};
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// Loop through all bytes in the subchannel data and populate
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int index = -1;
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for(int i = 0; i < 16; i++)
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{
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// Get the modulo value of the current byte
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int modValue = i % 8;
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if(modValue == 0)
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index++;
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// Retrieve the next byte
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byte b = this.Data[i];
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// Set the respective bit in the new byte data
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formattedData['P'][index] |= (byte)(HasBitSet(b, 7) ? 1 << (7 - modValue) : 0);
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formattedData['Q'][index] |= (byte)(HasBitSet(b, 6) ? 1 << (7 - modValue) : 0);
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formattedData['R'][index] |= (byte)(HasBitSet(b, 5) ? 1 << (7 - modValue) : 0);
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formattedData['S'][index] |= (byte)(HasBitSet(b, 4) ? 1 << (7 - modValue) : 0);
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formattedData['T'][index] |= (byte)(HasBitSet(b, 3) ? 1 << (7 - modValue) : 0);
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formattedData['U'][index] |= (byte)(HasBitSet(b, 2) ? 1 << (7 - modValue) : 0);
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formattedData['V'][index] |= (byte)(HasBitSet(b, 1) ? 1 << (7 - modValue) : 0);
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formattedData['W'][index] |= (byte)(HasBitSet(b, 0) ? 1 << (7 - modValue) : 0);
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}
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return formattedData;
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}
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/// <summary>
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/// Check if a bit is set in a byte
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/// </summary>
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/// <param name="value">Byte value to check</param>
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/// <param name="bitIndex">Index of the bit to check</param>
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/// <returns>True if the bit was set, false otherwise</returns>
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private bool HasBitSet(byte value, int bitIndex) => (value & (1 << bitIndex)) != 0;
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}
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}
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