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using Ryujinx.Graphics.Nvdec.Vp9.Types;
using System.Diagnostics;
namespace Ryujinx.Graphics.Nvdec.Vp9
{
internal static class PredCommon
{
public static int GetReferenceModeContext(ref Vp9Common cm, ref MacroBlockD xd)
{
int ctx;
// Note:
// The mode info data structure has a one element border above and to the
// left of the entries corresponding to real macroblocks.
// The prediction flags in these dummy entries are initialized to 0.
if (!xd.AboveMi.IsNull && !xd.LeftMi.IsNull)
{ // both edges available
if (!xd.AboveMi.Value.HasSecondRef() && !xd.LeftMi.Value.HasSecondRef())
{
// Neither edge uses comp pred (0/1)
ctx = (xd.AboveMi.Value.RefFrame[0] == cm.CompFixedRef ? 1 : 0) ^
(xd.LeftMi.Value.RefFrame[0] == cm.CompFixedRef ? 1 : 0);
}
else if (!xd.AboveMi.Value.HasSecondRef())
{
// One of two edges uses comp pred (2/3)
ctx = 2 + (xd.AboveMi.Value.RefFrame[0] == cm.CompFixedRef || !xd.AboveMi.Value.IsInterBlock() ? 1 : 0);
}
else if (!xd.LeftMi.Value.HasSecondRef())
{
// One of two edges uses comp pred (2/3)
ctx = 2 + (xd.LeftMi.Value.RefFrame[0] == cm.CompFixedRef || !xd.LeftMi.Value.IsInterBlock() ? 1 : 0);
}
else // Both edges use comp pred (4)
{
ctx = 4;
}
}
else if (!xd.AboveMi.IsNull || !xd.LeftMi.IsNull)
{ // One edge available
ref ModeInfo edgeMi = ref !xd.AboveMi.IsNull ? ref xd.AboveMi.Value : ref xd.LeftMi.Value;
if (!edgeMi.HasSecondRef())
{
// Edge does not use comp pred (0/1)
ctx = edgeMi.RefFrame[0] == cm.CompFixedRef ? 1 : 0;
}
else
{
// Edge uses comp pred (3)
ctx = 3;
}
}
else
{ // No edges available (1)
ctx = 1;
}
Debug.Assert(ctx >= 0 && ctx < Constants.CompInterContexts);
return ctx;
}
// Returns a context number for the given MB prediction signal
public static int GetPredContextCompRefP(ref Vp9Common cm, ref MacroBlockD xd)
{
int predContext;
// Note:
// The mode info data structure has a one element border above and to the
// left of the entries corresponding to real macroblocks.
// The prediction flags in these dummy entries are initialized to 0.
int fixRefIdx = cm.RefFrameSignBias[cm.CompFixedRef];
int varRefIdx = fixRefIdx == 0 ? 1 : 0;
if (!xd.AboveMi.IsNull && !xd.LeftMi.IsNull)
{ // Both edges available
bool aboveIntra = !xd.AboveMi.Value.IsInterBlock();
bool leftIntra = !xd.LeftMi.Value.IsInterBlock();
if (aboveIntra && leftIntra)
{ // Intra/Intra (2)
predContext = 2;
}
else if (aboveIntra || leftIntra)
{ // Intra/Inter
ref ModeInfo edgeMi = ref aboveIntra ? ref xd.LeftMi.Value : ref xd.AboveMi.Value;
if (!edgeMi.HasSecondRef()) // single pred (1/3)
{
predContext = 1 + 2 * (edgeMi.RefFrame[0] != cm.CompVarRef[1] ? 1 : 0);
}
else // Comp pred (1/3)
{
predContext = 1 + 2 * (edgeMi.RefFrame[varRefIdx] != cm.CompVarRef[1] ? 1 : 0);
}
}
else
{ // Inter/Inter
bool lSg = !xd.LeftMi.Value.HasSecondRef();
bool aSg = !xd.AboveMi.Value.HasSecondRef();
sbyte vrfa = aSg ? xd.AboveMi.Value.RefFrame[0] : xd.AboveMi.Value.RefFrame[varRefIdx];
sbyte vrfl = lSg ? xd.LeftMi.Value.RefFrame[0] : xd.LeftMi.Value.RefFrame[varRefIdx];
if (vrfa == vrfl && cm.CompVarRef[1] == vrfa)
{
predContext = 0;
}
else if (lSg && aSg)
{ // Single/Single
if ((vrfa == cm.CompFixedRef && vrfl == cm.CompVarRef[0]) ||
(vrfl == cm.CompFixedRef && vrfa == cm.CompVarRef[0]))
{
predContext = 4;
}
else if (vrfa == vrfl)
{
predContext = 3;
}
else
{
predContext = 1;
}
}
else if (lSg || aSg)
{ // Single/Comp
sbyte vrfc = lSg ? vrfa : vrfl;
sbyte rfs = aSg ? vrfa : vrfl;
if (vrfc == cm.CompVarRef[1] && rfs != cm.CompVarRef[1])
{
predContext = 1;
}
else if (rfs == cm.CompVarRef[1] && vrfc != cm.CompVarRef[1])
{
predContext = 2;
}
else
{
predContext = 4;
}
}
else if (vrfa == vrfl)
{ // Comp/Comp
predContext = 4;
}
else
{
predContext = 2;
}
}
}
else if (!xd.AboveMi.IsNull || !xd.LeftMi.IsNull)
{ // One edge available
ref ModeInfo edgeMi = ref !xd.AboveMi.IsNull ? ref xd.AboveMi.Value : ref xd.LeftMi.Value;
if (!edgeMi.IsInterBlock())
{
predContext = 2;
}
else
{
if (edgeMi.HasSecondRef())
{
predContext = 4 * (edgeMi.RefFrame[varRefIdx] != cm.CompVarRef[1] ? 1 : 0);
}
else
{
predContext = 3 * (edgeMi.RefFrame[0] != cm.CompVarRef[1] ? 1 : 0);
}
}
}
else
{ // No edges available (2)
predContext = 2;
}
Debug.Assert(predContext >= 0 && predContext < Constants.RefContexts);
return predContext;
}
public static int GetPredContextSingleRefP1(ref MacroBlockD xd)
{
int predContext;
// Note:
// The mode info data structure has a one element border above and to the
// left of the entries corresponding to real macroblocks.
// The prediction flags in these dummy entries are initialized to 0.
if (!xd.AboveMi.IsNull && !xd.LeftMi.IsNull)
{ // Both edges available
bool aboveIntra = !xd.AboveMi.Value.IsInterBlock();
bool leftIntra = !xd.LeftMi.Value.IsInterBlock();
if (aboveIntra && leftIntra)
{ // Intra/Intra
predContext = 2;
}
else if (aboveIntra || leftIntra)
{ // Intra/Inter or Inter/Intra
ref ModeInfo edgeMi = ref aboveIntra ? ref xd.LeftMi.Value : ref xd.AboveMi.Value;
if (!edgeMi.HasSecondRef())
{
predContext = 4 * (edgeMi.RefFrame[0] == Constants.LastFrame ? 1 : 0);
}
else
{
predContext = 1 + (edgeMi.RefFrame[0] == Constants.LastFrame ||
edgeMi.RefFrame[1] == Constants.LastFrame ? 1 : 0);
}
}
else
{ // Inter/Inter
bool aboveHasSecond = xd.AboveMi.Value.HasSecondRef();
bool leftHasSecond = xd.LeftMi.Value.HasSecondRef();
sbyte above0 = xd.AboveMi.Value.RefFrame[0];
sbyte above1 = xd.AboveMi.Value.RefFrame[1];
sbyte left0 = xd.LeftMi.Value.RefFrame[0];
sbyte left1 = xd.LeftMi.Value.RefFrame[1];
if (aboveHasSecond && leftHasSecond)
{
predContext = 1 + (above0 == Constants.LastFrame || above1 == Constants.LastFrame ||
left0 == Constants.LastFrame || left1 == Constants.LastFrame ? 1 : 0);
}
else if (aboveHasSecond || leftHasSecond)
{
sbyte rfs = !aboveHasSecond ? above0 : left0;
sbyte crf1 = aboveHasSecond ? above0 : left0;
sbyte crf2 = aboveHasSecond ? above1 : left1;
if (rfs == Constants.LastFrame)
{
predContext = 3 + (crf1 == Constants.LastFrame || crf2 == Constants.LastFrame ? 1 : 0);
}
else
{
predContext = (crf1 == Constants.LastFrame || crf2 == Constants.LastFrame ? 1 : 0);
}
}
else
{
predContext = 2 * (above0 == Constants.LastFrame ? 1 : 0) + 2 * (left0 == Constants.LastFrame ? 1 : 0);
}
}
}
else if (!xd.AboveMi.IsNull || !xd.LeftMi.IsNull)
{ // One edge available
ref ModeInfo edgeMi = ref !xd.AboveMi.IsNull ? ref xd.AboveMi.Value : ref xd.LeftMi.Value;
if (!edgeMi.IsInterBlock())
{ // Intra
predContext = 2;
}
else
{ // Inter
if (!edgeMi.HasSecondRef())
{
predContext = 4 * (edgeMi.RefFrame[0] == Constants.LastFrame ? 1 : 0);
}
else
{
predContext = 1 + (edgeMi.RefFrame[0] == Constants.LastFrame ||
edgeMi.RefFrame[1] == Constants.LastFrame ? 1 : 0);
}
}
}
else
{ // No edges available
predContext = 2;
}
Debug.Assert(predContext >= 0 && predContext < Constants.RefContexts);
return predContext;
}
public static int GetPredContextSingleRefP2(ref MacroBlockD xd)
{
int predContext;
// Note:
// The mode info data structure has a one element border above and to the
// left of the entries corresponding to real macroblocks.
// The prediction flags in these dummy entries are initialized to 0.
if (!xd.AboveMi.IsNull && !xd.LeftMi.IsNull)
{ // Both edges available
bool aboveIntra = !xd.AboveMi.Value.IsInterBlock();
bool leftIntra = !xd.LeftMi.Value.IsInterBlock();
if (aboveIntra && leftIntra)
{ // Intra/Intra
predContext = 2;
}
else if (aboveIntra || leftIntra)
{ // Intra/Inter or Inter/Intra
ref ModeInfo edgeMi = ref aboveIntra ? ref xd.LeftMi.Value : ref xd.AboveMi.Value;
if (!edgeMi.HasSecondRef())
{
if (edgeMi.RefFrame[0] == Constants.LastFrame)
{
predContext = 3;
}
else
{
predContext = 4 * (edgeMi.RefFrame[0] == Constants.GoldenFrame ? 1 : 0);
}
}
else
{
predContext = 1 + 2 * (edgeMi.RefFrame[0] == Constants.GoldenFrame ||
edgeMi.RefFrame[1] == Constants.GoldenFrame ? 1 : 0);
}
}
else
{ // Inter/Inter
bool aboveHasSecond = xd.AboveMi.Value.HasSecondRef();
bool leftHasSecond = xd.LeftMi.Value.HasSecondRef();
sbyte above0 = xd.AboveMi.Value.RefFrame[0];
sbyte above1 = xd.AboveMi.Value.RefFrame[1];
sbyte left0 = xd.LeftMi.Value.RefFrame[0];
sbyte left1 = xd.LeftMi.Value.RefFrame[1];
if (aboveHasSecond && leftHasSecond)
{
if (above0 == left0 && above1 == left1)
{
predContext = 3 * (above0 == Constants.GoldenFrame || above1 == Constants.GoldenFrame ||
left0 == Constants.GoldenFrame || left1 == Constants.GoldenFrame ? 1 : 0);
}
else
{
predContext = 2;
}
}
else if (aboveHasSecond || leftHasSecond)
{
sbyte rfs = !aboveHasSecond ? above0 : left0;
sbyte crf1 = aboveHasSecond ? above0 : left0;
sbyte crf2 = aboveHasSecond ? above1 : left1;
if (rfs == Constants.GoldenFrame)
{
predContext = 3 + (crf1 == Constants.GoldenFrame || crf2 == Constants.GoldenFrame ? 1 : 0);
}
else if (rfs == Constants.AltRefFrame)
{
predContext = crf1 == Constants.GoldenFrame || crf2 == Constants.GoldenFrame ? 1 : 0;
}
else
{
predContext = 1 + 2 * (crf1 == Constants.GoldenFrame || crf2 == Constants.GoldenFrame ? 1 : 0);
}
}
else
{
if (above0 == Constants.LastFrame && left0 == Constants.LastFrame)
{
predContext = 3;
}
else if (above0 == Constants.LastFrame || left0 == Constants.LastFrame)
{
sbyte edge0 = (above0 == Constants.LastFrame) ? left0 : above0;
predContext = 4 * (edge0 == Constants.GoldenFrame ? 1 : 0);
}
else
{
predContext = 2 * (above0 == Constants.GoldenFrame ? 1 : 0) + 2 * (left0 == Constants.GoldenFrame ? 1 : 0);
}
}
}
}
else if (!xd.AboveMi.IsNull || !xd.LeftMi.IsNull)
{ // One edge available
ref ModeInfo edgeMi = ref !xd.AboveMi.IsNull ? ref xd.AboveMi.Value : ref xd.LeftMi.Value;
if (!edgeMi.IsInterBlock() || (edgeMi.RefFrame[0] == Constants.LastFrame && !edgeMi.HasSecondRef()))
{
predContext = 2;
}
else if (!edgeMi.HasSecondRef())
{
predContext = 4 * (edgeMi.RefFrame[0] == Constants.GoldenFrame ? 1 : 0);
}
else
{
predContext = 3 * (edgeMi.RefFrame[0] == Constants.GoldenFrame ||
edgeMi.RefFrame[1] == Constants.GoldenFrame ? 1 : 0);
}
}
else
{ // No edges available (2)
predContext = 2;
}
Debug.Assert(predContext >= 0 && predContext < Constants.RefContexts);
return predContext;
}
}
}
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