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disc - add subcode interleaving/deinterleaving utilities

This commit is contained in:
zeromus 2014-12-25 19:54:37 +00:00
parent 6b48a43f72
commit 313c0a1c27
1 changed files with 38 additions and 0 deletions
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38
BizHawk.Emulation.DiscSystem/Subcode.cs
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@ -18,6 +18,44 @@ namespace BizHawk.Emulation.DiscSystem
void ReadSubcodeChannel(int number, byte[] buffer, int offset);
}
public static class SubcodeUtils
{
public static void Interleave(byte[] in_buf, int in_buf_index, byte[] out_buf, int out_buf_index)
{
for (int d = 0; d < 12; d++)
{
for (int bitpoodle = 0; bitpoodle < 8; bitpoodle++)
{
int rawb = 0;
for (int ch = 0; ch < 8; ch++)
{
rawb |= ((in_buf[ch * 12 + d + in_buf_index] >> (7 - bitpoodle)) & 1) << (7 - ch);
}
out_buf[(d << 3) + bitpoodle + out_buf_index] = (byte)rawb;
}
}
}
public static void Deinterleave(byte[] in_buf, int in_buf_index, byte[] out_buf, int out_buf_index)
{
for (int i = 0; i < 96; i++)
out_buf[i] = 0;
for (int ch = 0; ch < 8; ch++)
{
for (int i = 0; i < 96; i++)
{
out_buf[(ch * 12) + (i >> 3) + out_buf_index] |= (byte)(((in_buf[i + in_buf_index] >> (7 - ch)) & 0x1) << (7 - (i & 0x7)));
}
}
}
}
/// <summary>
/// Reads subcode from an internally-managed buffer
/// </summary>