176 lines
3.5 KiB
C++
176 lines
3.5 KiB
C++
/**********************************************************************
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Audacity: A Digital Audio Editor
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Echo.cpp
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Dominic Mazzoni
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Vaughan Johnson (dialog)
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*******************************************************************//**
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\class EffectEcho
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\brief An Effect that causes an echo, variable delay and volume.
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*//****************************************************************//**
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\class EchoDialog
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\brief EchoDialog used with EffectEcho
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*//*******************************************************************/
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#include "../Audacity.h"
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#include <float.h>
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#include <wx/intl.h>
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#include "../widgets/valnum.h"
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#include "Echo.h"
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// Define keys, defaults, minimums, and maximums for the effect parameters
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//
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// Name Type Key Def Min Max Scale
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Param( Delay, float, XO("Delay"), 1.0f, 0.001f, FLT_MAX, 1.0f );
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Param( Decay, float, XO("Decay"), 0.5f, 0.0f, FLT_MAX, 1.0f );
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EffectEcho::EffectEcho()
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{
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delay = DEF_Delay;
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decay = DEF_Decay;
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SetLinearEffectFlag(true);
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}
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EffectEcho::~EffectEcho()
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{
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}
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// IdentInterface implementation
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wxString EffectEcho::GetSymbol()
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{
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return ECHO_PLUGIN_SYMBOL;
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}
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wxString EffectEcho::GetDescription()
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{
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return XO("Repeats the selected audio again and again");
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}
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// EffectIdentInterface implementation
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EffectType EffectEcho::GetType()
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{
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return EffectTypeProcess;
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}
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// EffectClientInterface implementation
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int EffectEcho::GetAudioInCount()
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{
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return 1;
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}
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int EffectEcho::GetAudioOutCount()
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{
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return 1;
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}
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bool EffectEcho::ProcessInitialize(sampleCount WXUNUSED(totalLen), ChannelNames WXUNUSED(chanMap))
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{
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if (delay == 0.0)
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{
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return false;
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}
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histPos = 0;
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histLen = (sampleCount) (mSampleRate * delay);
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history = new float[histLen];
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memset(history, 0, sizeof(float) * histLen);
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return history != NULL;
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}
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bool EffectEcho::ProcessFinalize()
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{
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delete [] history;
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return true;
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}
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sampleCount EffectEcho::ProcessBlock(float **inBlock, float **outBlock, sampleCount blockLen)
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{
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float *ibuf = inBlock[0];
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float *obuf = outBlock[0];
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for (sampleCount i = 0; i < blockLen; i++, histPos++)
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{
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if (histPos == histLen)
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{
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histPos = 0;
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}
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history[histPos] = obuf[i] = ibuf[i] + history[histPos] * decay;
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}
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return blockLen;
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}
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bool EffectEcho::GetAutomationParameters(EffectAutomationParameters & parms)
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{
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parms.WriteFloat(KEY_Delay, delay);
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parms.WriteFloat(KEY_Decay, decay);
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return true;
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}
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bool EffectEcho::SetAutomationParameters(EffectAutomationParameters & parms)
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{
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ReadAndVerifyFloat(Delay);
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ReadAndVerifyFloat(Decay);
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delay = Delay;
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decay = Decay;
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return true;
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}
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void EffectEcho::PopulateOrExchange(ShuttleGui & S)
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{
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S.AddSpace(0, 5);
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S.StartMultiColumn(2, wxALIGN_CENTER);
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{
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FloatingPointValidator<double> vldDelay(3, &delay, NUM_VAL_NO_TRAILING_ZEROES);
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vldDelay.SetRange(MIN_Delay, MAX_Delay);
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S.AddTextBox(_("Delay time (seconds):"), wxT(""), 10)->SetValidator(vldDelay);
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FloatingPointValidator<double> vldDecay(3, &decay, NUM_VAL_NO_TRAILING_ZEROES);
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vldDecay.SetRange(MIN_Decay, MAX_Decay);
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S.AddTextBox(_("Decay factor:"), wxT(""), 10)->SetValidator(vldDecay);
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}
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S.EndMultiColumn();
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}
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bool EffectEcho::TransferDataToWindow()
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{
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if (!mUIParent->TransferDataToWindow())
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{
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return false;
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}
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return true;
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}
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bool EffectEcho::TransferDataFromWindow()
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{
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if (!mUIParent->Validate() || !mUIParent->TransferDataFromWindow())
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{
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return false;
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}
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return true;
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}
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