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131 lines
3.5 KiB
131 lines
3.5 KiB
//============================================================================
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// BDInfo - Blu-ray Video and Audio Analysis Tool
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// Copyright © 2010 Cinema Squid
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//=============================================================================
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using System;
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using System.Collections.Specialized;
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using System.IO;
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namespace BDInfo
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{
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public class TSStreamBuffer
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{
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private MemoryStream Stream = new MemoryStream();
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private int SkipBits = 0;
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private byte[] Buffer;
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private int BufferLength = 0;
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public int TransferLength = 0;
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public TSStreamBuffer()
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{
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Buffer = new byte[4096];
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Stream = new MemoryStream(Buffer);
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}
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public long Length => (long)BufferLength;
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public long Position => Stream.Position;
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public void Add(
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byte[] buffer,
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int offset,
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int length)
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{
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TransferLength += length;
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if (BufferLength + length >= Buffer.Length)
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{
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length = Buffer.Length - BufferLength;
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}
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if (length > 0)
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{
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Array.Copy(buffer, offset, Buffer, BufferLength, length);
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BufferLength += length;
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}
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}
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public void Seek(
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long offset,
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SeekOrigin loc)
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{
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Stream.Seek(offset, loc);
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}
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public void Reset()
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{
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BufferLength = 0;
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TransferLength = 0;
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}
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public void BeginRead()
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{
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SkipBits = 0;
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Stream.Seek(0, SeekOrigin.Begin);
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}
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public void EndRead()
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{
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}
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public byte[] ReadBytes(int bytes)
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{
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if (Stream.Position + bytes >= BufferLength)
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{
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return null;
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}
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byte[] value = new byte[bytes];
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Stream.Read(value, 0, bytes);
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return value;
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}
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public byte ReadByte()
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{
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return (byte)Stream.ReadByte();
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}
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public int ReadBits(int bits)
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{
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long pos = Stream.Position;
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int shift = 24;
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int data = 0;
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for (int i = 0; i < 4; i++)
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{
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if (pos + i >= BufferLength) break;
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data += (Stream.ReadByte() << shift);
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shift -= 8;
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}
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var vector = new BitVector32(data);
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int value = 0;
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for (int i = SkipBits; i < SkipBits + bits; i++)
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{
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value <<= 1;
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value += (vector[1 << (32 - i - 1)] ? 1 : 0);
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}
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SkipBits += bits;
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Stream.Seek(pos + (SkipBits >> 3), SeekOrigin.Begin);
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SkipBits = SkipBits % 8;
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return value;
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}
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}
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}
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