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- Audio bus is a new asset type that allows audio to be routed around to effects, etc. - Extracts the underlying logic from source buses and changes source bus semantics to be a sonification of audio buses. Audio buses do not render to be audible on their own. - Main use-case is side-chaining audio effects (e.g. side chain compression, auto-wah filters, etc). #rb Ethan.Geller, Rob.Gay, Maxwell.Hayes, Phil.Popp, Ryan.Mangin #jira UE-88494 #ROBOMERGE-SOURCE: CL 11449969 via CL 11450113 #ROBOMERGE-BOT: (v654-11333218) [CL 11450145 by aaron mcleran in Main branch]
100 lines
2.4 KiB
C++
100 lines
2.4 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "DSP/RingModulation.h"
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#include "DSP/Dsp.h"
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#include "DSP/BufferVectorOperations.h"
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namespace Audio
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{
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FRingModulation::FRingModulation()
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: ModulationFrequency(800.0f)
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, ModulationDepth(0.5f)
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, DryLevel(0.0f)
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, WetLevel(1.0f)
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, Scale(1.0f)
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, NumChannels(0)
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{
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UpdateScale();
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}
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FRingModulation::~FRingModulation()
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{
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}
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void FRingModulation::Init(const float InSampleRate, const int32 InNumChannels)
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{
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Osc.Init(InSampleRate);
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Osc.SetFrequency(ModulationFrequency);
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Osc.Update();
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Osc.Start();
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NumChannels = InNumChannels;
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}
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void FRingModulation::UpdateScale()
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{
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Scale = WetLevel * ModulationDepth;
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}
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void FRingModulation::SetExternalPatchSource(Audio::FPatchOutputStrongPtr InPatch)
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{
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Patch = InPatch;
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}
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void FRingModulation::SetWetLevel(const float InWetLevel)
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{
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WetLevel = InWetLevel;
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UpdateScale();
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}
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void FRingModulation::SetModulatorWaveType(const EOsc::Type InType)
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{
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Osc.SetType(InType);
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}
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void FRingModulation::SetModulationFrequency(const float InModulationFrequency)
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{
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Osc.SetFrequency(FMath::Clamp(InModulationFrequency, 10.0f, 10000.0f));
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Osc.Update();
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}
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void FRingModulation::SetModulationDepth(const float InModulationDepth)
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{
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ModulationDepth = FMath::Clamp(InModulationDepth, -1.0f, 1.0f);
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UpdateScale();
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}
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void FRingModulation::ProcessAudio(const float* InBuffer, const int32 InNumSamples, float* OutBuffer)
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{
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if (ModulationBuffer.Num() != InNumSamples * NumChannels)
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{
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ModulationBuffer.Reset();
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ModulationBuffer.AddZeroed(InNumSamples * NumChannels);
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}
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// If we have an external patch source to modulate against, copy that data into the modulation buffer
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if (Patch.IsValid())
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{
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Patch->PopAudio(ModulationBuffer.GetData(), ModulationBuffer.Num(), true);
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}
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else
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{
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// Write the oscillator data into the modulation buffer
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float* ModulationBufferPtr = ModulationBuffer.GetData();
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for (int32 SampleIndex = 0; SampleIndex < InNumSamples; ++SampleIndex)
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{
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ModulationBufferPtr[SampleIndex] = Osc.Generate();
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}
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}
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// Multiply the input buffer by the modulation buffer in-place
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Audio::MultiplyBuffersInPlace(InBuffer, ModulationBuffer.GetData(), InNumSamples);
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// Perform a buffer weighted sum of the modulation buffer with the Scale value and the dry level as weights
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Audio::BufferWeightedSumFast(InBuffer, DryLevel, ModulationBuffer.GetData(), Scale, OutBuffer, InNumSamples);
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}
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}
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