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