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Detokenize.cs
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Detokenize.cs
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using Ryujinx.Common.Memory;
using Ryujinx.Graphics.Nvdec.Vp9.Dsp;
using Ryujinx.Graphics.Nvdec.Vp9.Types;
using Ryujinx.Graphics.Video;
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using static Ryujinx.Graphics.Nvdec.Vp9.Dsp.InvTxfm;
namespace Ryujinx.Graphics.Nvdec.Vp9
{
internal static class Detokenize
{
private const int EobContextNode = 0;
private const int ZeroContextNode = 1;
private const int OneContextNode = 2;
private static int GetCoefContext(ReadOnlySpan<short> neighbors, ReadOnlySpan<byte> tokenCache, int c)
{
const int MaxNeighbors = 2;
return (1 + tokenCache[neighbors[MaxNeighbors * c + 0]] + tokenCache[neighbors[MaxNeighbors * c + 1]]) >> 1;
}
private static int ReadCoeff(
ref Reader r,
ReadOnlySpan<byte> probs,
int n,
ref ulong value,
ref int count,
ref uint range)
{
int i, val = 0;
for (i = 0; i < n; ++i)
{
val = (val << 1) | r.ReadBool(probs[i], ref value, ref count, ref range);
}
return val;
}
private static int DecodeCoefs(
ref MacroBlockD xd,
PlaneType type,
Span<int> dqcoeff,
TxSize txSize,
ref Array2<short> dq,
int ctx,
ReadOnlySpan<short> scan,
ReadOnlySpan<short> nb,
ref Reader r)
{
ref Vp9BackwardUpdates counts = ref xd.Counts.Value;
int maxEob = 16 << ((int)txSize << 1);
ref Vp9EntropyProbs fc = ref xd.Fc.Value;
int refr = xd.Mi[0].Value.IsInterBlock() ? 1 : 0;
int band, c = 0;
ref Array6<Array6<Array3<byte>>> coefProbs = ref fc.CoefProbs[(int)txSize][(int)type][refr];
Span<byte> tokenCache = stackalloc byte[32 * 32];
ReadOnlySpan<byte> bandTranslate = Luts.GetBandTranslate(txSize);
int dqShift = (txSize == TxSize.Tx32x32) ? 1 : 0;
int v;
short dqv = dq[0];
ReadOnlySpan<byte> cat6Prob = (xd.Bd == 12)
? Luts.Vp9Cat6ProbHigh12
: (xd.Bd == 10) ? Luts.Vp9Cat6ProbHigh12[2..] : Luts.Vp9Cat6Prob;
int cat6Bits = (xd.Bd == 12) ? 18 : (xd.Bd == 10) ? 16 : 14;
// Keep value, range, and count as locals. The compiler produces better
// results with the locals than using r directly.
ulong value = r.Value;
uint range = r.Range;
int count = r.Count;
while (c < maxEob)
{
int val = -1;
band = bandTranslate[0];
bandTranslate = bandTranslate[1..];
ref Array3<byte> prob = ref coefProbs[band][ctx];
if (!xd.Counts.IsNull)
{
++counts.EobBranch[(int)txSize][(int)type][refr][band][ctx];
}
if (r.ReadBool(prob[EobContextNode], ref value, ref count, ref range) == 0)
{
if (!xd.Counts.IsNull)
{
++counts.Coef[(int)txSize][(int)type][refr][band][ctx][Constants.EobModelToken];
}
break;
}
while (r.ReadBool(prob[ZeroContextNode], ref value, ref count, ref range) == 0)
{
if (!xd.Counts.IsNull)
{
++counts.Coef[(int)txSize][(int)type][refr][band][ctx][Constants.ZeroToken];
}
dqv = dq[1];
tokenCache[scan[c]] = 0;
++c;
if (c >= maxEob)
{
r.Value = value;
r.Range = range;
r.Count = count;
return c; // Zero tokens at the end (no eob token)
}
ctx = GetCoefContext(nb, tokenCache, c);
band = bandTranslate[0];
bandTranslate = bandTranslate[1..];
prob = ref coefProbs[band][ctx];
}
if (r.ReadBool(prob[OneContextNode], ref value, ref count, ref range) != 0)
{
ReadOnlySpan<byte> p = Luts.Vp9Pareto8Full[prob[Constants.PivotNode] - 1];
if (!xd.Counts.IsNull)
{
++counts.Coef[(int)txSize][(int)type][refr][band][ctx][Constants.TwoToken];
}
if (r.ReadBool(p[0], ref value, ref count, ref range) != 0)
{
if (r.ReadBool(p[3], ref value, ref count, ref range) != 0)
{
tokenCache[scan[c]] = 5;
if (r.ReadBool(p[5], ref value, ref count, ref range) != 0)
{
if (r.ReadBool(p[7], ref value, ref count, ref range) != 0)
{
val = Constants.Cat6MinVal + ReadCoeff(ref r, cat6Prob, cat6Bits, ref value, ref count, ref range);
}
else
{
val = Constants.Cat5MinVal + ReadCoeff(ref r, Luts.Vp9Cat5Prob, 5, ref value, ref count, ref range);
}
}
else if (r.ReadBool(p[6], ref value, ref count, ref range) != 0)
{
val = Constants.Cat4MinVal + ReadCoeff(ref r, Luts.Vp9Cat4Prob, 4, ref value, ref count, ref range);
}
else
{
val = Constants.Cat3MinVal + ReadCoeff(ref r, Luts.Vp9Cat3Prob, 3, ref value, ref count, ref range);
}
}
else
{
tokenCache[scan[c]] = 4;
if (r.ReadBool(p[4], ref value, ref count, ref range) != 0)
{
val = Constants.Cat2MinVal + ReadCoeff(ref r, Luts.Vp9Cat2Prob, 2, ref value, ref count, ref range);
}
else
{
val = Constants.Cat1MinVal + ReadCoeff(ref r, Luts.Vp9Cat1Prob, 1, ref value, ref count, ref range);
}
}
// Val may use 18-bits
v = (int)(((long)val * dqv) >> dqShift);
}
else
{
if (r.ReadBool(p[1], ref value, ref count, ref range) != 0)
{
tokenCache[scan[c]] = 3;
v = ((3 + r.ReadBool(p[2], ref value, ref count, ref range)) * dqv) >> dqShift;
}
else
{
tokenCache[scan[c]] = 2;
v = (2 * dqv) >> dqShift;
}
}
}
else
{
if (!xd.Counts.IsNull)
{
++counts.Coef[(int)txSize][(int)type][refr][band][ctx][Constants.OneToken];
}
tokenCache[scan[c]] = 1;
v = dqv >> dqShift;
}
dqcoeff[scan[c]] = (int)HighbdCheckRange(r.ReadBool(128, ref value, ref count, ref range) != 0 ? -v : v, xd.Bd);
++c;
ctx = GetCoefContext(nb, tokenCache, c);
dqv = dq[1];
}
r.Value = value;
r.Range = range;
r.Count = count;
return c;
}
private static void GetCtxShift(ref MacroBlockD xd, ref int ctxShiftA, ref int ctxShiftL, int x, int y, uint txSizeInBlocks)
{
if (xd.MaxBlocksWide != 0)
{
if (txSizeInBlocks + x > xd.MaxBlocksWide)
{
ctxShiftA = (int)(txSizeInBlocks - (xd.MaxBlocksWide - x)) * 8;
}
}
if (xd.MaxBlocksHigh != 0)
{
if (txSizeInBlocks + y > xd.MaxBlocksHigh)
{
ctxShiftL = (int)(txSizeInBlocks - (xd.MaxBlocksHigh - y)) * 8;
}
}
}
private static PlaneType GetPlaneType(int plane)
{
return (PlaneType)(plane > 0 ? 1 : 0);
}
public static int DecodeBlockTokens(
ref TileWorkerData twd,
int plane,
Luts.ScanOrder sc,
int x,
int y,
TxSize txSize,
int segId)
{
ref Reader r = ref twd.BitReader;
ref MacroBlockD xd = ref twd.Xd;
ref MacroBlockDPlane pd = ref xd.Plane[plane];
ref Array2<short> dequant = ref pd.SegDequant[segId];
int eob;
Span<sbyte> a = pd.AboveContext.AsSpan()[x..];
Span<sbyte> l = pd.LeftContext.AsSpan()[y..];
int ctx;
int ctxShiftA = 0;
int ctxShiftL = 0;
switch (txSize)
{
case TxSize.Tx4x4:
ctx = a[0] != 0 ? 1 : 0;
ctx += l[0] != 0 ? 1 : 0;
eob = DecodeCoefs(
ref xd,
GetPlaneType(plane),
pd.DqCoeff.AsSpan(),
txSize,
ref dequant,
ctx,
sc.Scan,
sc.Neighbors,
ref r);
a[0] = l[0] = (sbyte)(eob > 0 ? 1 : 0);
break;
case TxSize.Tx8x8:
GetCtxShift(ref xd, ref ctxShiftA, ref ctxShiftL, x, y, 1 << (int)TxSize.Tx8x8);
ctx = MemoryMarshal.Cast<sbyte, ushort>(a)[0] != 0 ? 1 : 0;
ctx += MemoryMarshal.Cast<sbyte, ushort>(l)[0] != 0 ? 1 : 0;
eob = DecodeCoefs(
ref xd,
GetPlaneType(plane),
pd.DqCoeff.AsSpan(),
txSize,
ref dequant,
ctx,
sc.Scan,
sc.Neighbors,
ref r);
MemoryMarshal.Cast<sbyte, ushort>(a)[0] = (ushort)((eob > 0 ? 0x0101 : 0) >> ctxShiftA);
MemoryMarshal.Cast<sbyte, ushort>(l)[0] = (ushort)((eob > 0 ? 0x0101 : 0) >> ctxShiftL);
break;
case TxSize.Tx16x16:
GetCtxShift(ref xd, ref ctxShiftA, ref ctxShiftL, x, y, 1 << (int)TxSize.Tx16x16);
ctx = MemoryMarshal.Cast<sbyte, uint>(a)[0] != 0 ? 1 : 0;
ctx += MemoryMarshal.Cast<sbyte, uint>(l)[0] != 0 ? 1 : 0;
eob = DecodeCoefs(
ref xd,
GetPlaneType(plane),
pd.DqCoeff.AsSpan(),
txSize,
ref dequant,
ctx,
sc.Scan,
sc.Neighbors,
ref r);
MemoryMarshal.Cast<sbyte, uint>(a)[0] = (uint)((eob > 0 ? 0x01010101 : 0) >> ctxShiftA);
MemoryMarshal.Cast<sbyte, uint>(l)[0] = (uint)((eob > 0 ? 0x01010101 : 0) >> ctxShiftL);
break;
case TxSize.Tx32x32:
GetCtxShift(ref xd, ref ctxShiftA, ref ctxShiftL, x, y, 1 << (int)TxSize.Tx32x32);
// NOTE: Casting to ulong here is safe because the default memory
// alignment is at least 8 bytes and the Tx32x32 is aligned on 8 byte
// boundaries.
ctx = MemoryMarshal.Cast<sbyte, ulong>(a)[0] != 0 ? 1 : 0;
ctx += MemoryMarshal.Cast<sbyte, ulong>(l)[0] != 0 ? 1 : 0;
eob = DecodeCoefs(
ref xd,
GetPlaneType(plane),
pd.DqCoeff.AsSpan(),
txSize,
ref dequant,
ctx,
sc.Scan,
sc.Neighbors,
ref r);
MemoryMarshal.Cast<sbyte, ulong>(a)[0] = (eob > 0 ? 0x0101010101010101UL : 0) >> ctxShiftA;
MemoryMarshal.Cast<sbyte, ulong>(l)[0] = (eob > 0 ? 0x0101010101010101UL : 0) >> ctxShiftL;
break;
default:
Debug.Assert(false, "Invalid transform size.");
eob = 0;
break;
}
return eob;
}
}
}