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//
// Copyright (c) 2019-2021 Ryujinx
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//
using Ryujinx.Audio.Renderer.Dsp.State;
using Ryujinx.Audio.Renderer.Parameter;
using System;
namespace Ryujinx.Audio.Renderer.Dsp.Command
{
public class BiquadFilterCommand : ICommand
{
public bool Enabled { get; set; }
public int NodeId { get; }
public CommandType CommandType => CommandType.BiquadFilter;
public ulong EstimatedProcessingTime { get; set; }
public BiquadFilterParameter Parameter { get; }
public Memory<BiquadFilterState> BiquadFilterState { get; }
public int InputBufferIndex { get; }
public int OutputBufferIndex { get; }
public bool NeedInitialization { get; }
public BiquadFilterCommand(int baseIndex, ref BiquadFilterParameter filter, Memory<BiquadFilterState> biquadFilterStateMemory, int inputBufferOffset, int outputBufferOffset, bool needInitialization, int nodeId)
{
Parameter = filter;
BiquadFilterState = biquadFilterStateMemory;
InputBufferIndex = baseIndex + inputBufferOffset;
OutputBufferIndex = baseIndex + outputBufferOffset;
NeedInitialization = needInitialization;
Enabled = true;
NodeId = nodeId;
}
private void ProcessBiquadFilter(Span<float> outputBuffer, ReadOnlySpan<float> inputBuffer, uint sampleCount)
{
const int fixedPointPrecisionForParameter = 14;
float a0 = FixedPointHelper.ToFloat(Parameter.Numerator[0], fixedPointPrecisionForParameter);
float a1 = FixedPointHelper.ToFloat(Parameter.Numerator[1], fixedPointPrecisionForParameter);
float a2 = FixedPointHelper.ToFloat(Parameter.Numerator[2], fixedPointPrecisionForParameter);
float b1 = FixedPointHelper.ToFloat(Parameter.Denominator[0], fixedPointPrecisionForParameter);
float b2 = FixedPointHelper.ToFloat(Parameter.Denominator[1], fixedPointPrecisionForParameter);
ref BiquadFilterState state = ref BiquadFilterState.Span[0];
for (int i = 0; i < sampleCount; i++)
{
float input = inputBuffer[i];
float output = input * a0 + state.Z1;
state.Z1 = input * a1 + output * b1 + state.Z2;
state.Z2 = input * a2 + output * b2;
outputBuffer[i] = output;
}
}
public void Process(CommandList context)
{
Span<float> outputBuffer = context.GetBuffer(InputBufferIndex);
if (NeedInitialization)
{
BiquadFilterState.Span[0] = new BiquadFilterState();
}
ProcessBiquadFilter(outputBuffer, outputBuffer, context.SampleCount);
}
}
}
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