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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 System;
namespace Ryujinx.Audio.Renderer.Dsp.Command
{
public class DepopForMixBuffersCommand : ICommand
{
public bool Enabled { get; set; }
public int NodeId { get; }
public CommandType CommandType => CommandType.DepopForMixBuffers;
public ulong EstimatedProcessingTime { get; set; }
public uint MixBufferOffset { get; }
public uint MixBufferCount { get; }
public float Decay { get; }
public Memory<float> DepopBuffer { get; }
private const int FixedPointPrecisionForDecay = 15;
public DepopForMixBuffersCommand(Memory<float> depopBuffer, uint bufferOffset, uint mixBufferCount, int nodeId, uint sampleRate)
{
Enabled = true;
NodeId = nodeId;
MixBufferOffset = bufferOffset;
MixBufferCount = mixBufferCount;
DepopBuffer = depopBuffer;
if (sampleRate == 48000)
{
Decay = 0.962189f;
}
else // if (sampleRate == 32000)
{
Decay = 0.943695f;
}
}
private float ProcessDepopMix(Span<float> buffer, float depopValue, uint sampleCount)
{
if (depopValue <= 0)
{
for (int i = 0; i < sampleCount; i++)
{
depopValue = FloatingPointHelper.MultiplyRoundDown(Decay, depopValue);
buffer[i] -= depopValue;
}
return -depopValue;
}
else
{
for (int i = 0; i < sampleCount; i++)
{
depopValue = FloatingPointHelper.MultiplyRoundDown(Decay, depopValue);
buffer[i] += depopValue;
}
return depopValue;
}
}
public void Process(CommandList context)
{
uint bufferCount = Math.Min(MixBufferOffset + MixBufferCount, context.BufferCount);
for (int i = (int)MixBufferOffset; i < bufferCount; i++)
{
float depopValue = DepopBuffer.Span[i];
if (depopValue != 0)
{
Span<float> buffer = context.GetBuffer(i);
DepopBuffer.Span[i] = ProcessDepopMix(buffer, depopValue, context.SampleCount);
}
}
}
}
}
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