100 lines
2.1 KiB
C#
100 lines
2.1 KiB
C#
using skyscraper5.UI.StreamAcquisition;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace skyscraper5.UI.StreamAcquirers
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{
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[StreamAcquirer("NULL","Returns only empty frames")]
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internal class NullStreamAcquirer : AbstractStreamAcquirer<object>
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{
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public override object AskUserForHandle(IWin32Window window)
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{
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return new object();
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}
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public override object GetHandle(string arg)
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{
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return null;
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}
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private BlankTransportStream ts;
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public override StreamSource GetStream(object inputHandle)
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{
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if (ts == null)
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ts = new BlankTransportStream();
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return new StreamSourceIoStreamWrapper(ts, null);
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}
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class BlankTransportStream : Stream
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{
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public int _continuityCounter;
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private long _internalPosition;
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public override bool CanRead => true;
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public override bool CanSeek => false;
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public override bool CanWrite => false;
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public override long Length => throw new NotImplementedException();
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public override long Position
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{
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get => _internalPosition;
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set => throw new NotImplementedException();
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}
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public override void Flush()
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{
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throw new NotImplementedException();
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}
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private byte[] buffer;
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public override int Read(byte[] outBuffer, int offset, int count)
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{
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if (count != 188)
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throw new ArgumentOutOfRangeException(nameof(count));
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if (buffer == null)
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buffer = new byte[188];
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buffer[0] = (byte)'G';
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buffer[1] = 0x1f;
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buffer[2] = 0xff;
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buffer[3] = 0;
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buffer[3] <<= 2;
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buffer[3] += 1;
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buffer[3] <<= 2;
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buffer[3] += (byte)_continuityCounter;
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_continuityCounter++;
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if (_continuityCounter > 0xf)
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_continuityCounter = 0;
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Array.Copy(buffer, 0, outBuffer, offset, count);
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return count;
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}
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public override long Seek(long offset, SeekOrigin origin)
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{
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throw new NotImplementedException();
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}
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public override void SetLength(long value)
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{
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throw new NotImplementedException();
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}
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public override void Write(byte[] buffer, int offset, int count)
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{
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throw new NotImplementedException();
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}
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}
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}
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}
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