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https://github.com/Ryujinx/Ryujinx.git
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75 lines
1.6 KiB
C#
75 lines
1.6 KiB
C#
using System.IO;
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namespace Ryujinx.Graphics.VDec
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{
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class BitStreamWriter
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{
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private const int BufferSize = 8;
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private Stream _baseStream;
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private int _buffer;
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private int _bufferPos;
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public BitStreamWriter(Stream baseStream)
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{
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_baseStream = baseStream;
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}
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public void WriteBit(bool value)
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{
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WriteBits(value ? 1 : 0, 1);
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}
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public void WriteBits(int value, int valueSize)
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{
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int valuePos = 0;
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int remaining = valueSize;
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while (remaining > 0)
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{
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int copySize = remaining;
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int free = GetFreeBufferBits();
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if (copySize > free)
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{
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copySize = free;
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}
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int mask = (1 << copySize) - 1;
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int srcShift = (valueSize - valuePos) - copySize;
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int dstShift = (BufferSize - _bufferPos) - copySize;
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_buffer |= ((value >> srcShift) & mask) << dstShift;
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valuePos += copySize;
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_bufferPos += copySize;
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remaining -= copySize;
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}
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}
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private int GetFreeBufferBits()
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{
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if (_bufferPos == BufferSize)
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{
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Flush();
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}
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return BufferSize - _bufferPos;
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}
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public void Flush()
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{
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if (_bufferPos != 0)
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{
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_baseStream.WriteByte((byte)_buffer);
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_buffer = 0;
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_bufferPos = 0;
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}
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}
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}
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} |