mirror of
https://github.com/aaru-dps/Aaru.Decryption.git
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108 lines
5.0 KiB
C#
108 lines
5.0 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : MPEG.cs
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// Author(s) : Rebecca Wallander <sakcheen+github@gmail.com>
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Handles MPEG packets functionality.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2023 Rebecca Wallander
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// ****************************************************************************/
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// http://www.mpucoder.com/DVD/vobov.html
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using System.Collections.Generic;
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using System.Linq;
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using System.Runtime.InteropServices;
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namespace Aaru.Decryption.DVD;
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public class MPEG
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{
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static byte[] _mpeg2PackHeaderStartCode =
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{
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0x0, 0x0, 0x1
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};
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public enum Mpeg2StreamId : byte
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{
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ProgramEnd = 0xB9, PackHeader = 0xBA, SystemHeader = 0xBB,
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ProgramStreamMap = 0xBC, PrivateStream1 = 0xBD, PaddingStream = 0xBE,
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PrivateStream2 = 0xBF, EcmStream = 0xF0, EmmStream = 0xF1,
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ItuTRecH222_0_or_IsoIec13818_1AnnexA_or_IsoIec13818_6DsmccStream = 0xF2, IsoIec13522Stream = 0xF3,
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ItuTRecH222_1TypeA = 0xF4, ItuTRecH222_1TypeB = 0xF5, ItuTRecH222_1TypeC = 0xF6,
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ItuTRecH222_1TypeD = 0xF7, ItuTRecH222_1TypeE = 0xF8, AncillaryStream = 0xF9,
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Reserved1 = 0xFA, Reserved2 = 0xFB, Reserved3 = 0xFC,
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Reserved4 = 0xFD, Reserved5 = 0xFE, ProgramStreamDirectory = 0xFF,
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// DVD Video can only hold 8 audio streams
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MpegAudioStream1 = 0xC0, MpegAudioStream2 = 0xC1, MpegAudioStream3 = 0xC2,
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MpegAudioStream4 = 0xC3, MpegAudioStream5 = 0xC4, MpegAudioStream6 = 0xC5,
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MpegAudioStream7 = 0xC6, MpegAudioStream8 = 0xC7, MpegAudioStream9 = 0xC8,
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MpegAudioStream10 = 0xC9, MpegAudioStream11 = 0xCA, MpegAudioStream12 = 0xCB,
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MpegAudioStream13 = 0xCC, MpegAudioStream14 = 0xCD, MpegAudioStream15 = 0xCE,
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MpegAudioStream16 = 0xCF, MpegAudioStream17 = 0xD0, MpegAudioStream18 = 0xD1,
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MpegAudioStream19 = 0xD2, MpegAudioStream20 = 0xD3, MpegAudioStream21 = 0xD4,
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MpegAudioStream22 = 0xD5, MpegAudioStream23 = 0xD6, MpegAudioStream24 = 0xD7,
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MpegAudioStream25 = 0xD8, MpegAudioStream26 = 0xD9, MpegAudioStream27 = 0xDA,
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MpegAudioStream28 = 0xDB, MpegAudioStream29 = 0xDC, MpegAudioStream30 = 0xDD,
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MpegAudioStream31 = 0xDE, MpegAudioStream32 = 0xDF,
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// DVD Video can only hold 1 video stream
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MpegVideStream1 = 0xE0, MpegVideStream2 = 0xE1, MpegVideStream3 = 0xE2,
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MpegVideStream4 = 0xE3, MpegVideStream5 = 0xE4, MpegVideStream6 = 0xE5,
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MpegVideStream7 = 0xE6, MpegVideStream8 = 0xE7, MpegVideStream9 = 0xE8,
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MpegVideStream10 = 0xE9, MpegVideStream11 = 0xEA, MpegVideStream12 = 0xEB,
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MpegVideStream13 = 0xEC, MpegVideStream14 = 0xED, MpegVideStream15 = 0xEE,
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MpegVideStream16 = 0xEF
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}
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public struct MpegHeader
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{
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
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public byte[] startCode;
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public byte packIdentifier;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
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public byte[] scrBlock;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
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public byte[] programMuxRateBlock;
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byte packStuffingLengthBlock;
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}
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public static bool ContainsMpegPackets(byte[] sectorData, uint blocks = 1, uint blockSize = 2048)
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{
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for(uint i = 0; i < blocks; i++)
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if(IsMpegPacket(sectorData.Skip((int)(i * blockSize))))
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return true;
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return false;
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}
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public static bool IsMpegPacket(IEnumerable<byte> sector) =>
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sector.Take(3).ToArray().SequenceEqual(_mpeg2PackHeaderStartCode);
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} |