79c79f9cd3
... This makes much code agnostic about how other things (functions and arguments) are typed. Many of these neeed to become size_t instead of sampleCount.
502 lines
14 KiB
C++
502 lines
14 KiB
C++
/**********************************************************************
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Audacity: A Digital Audio Editor
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Paulstretch.cpp
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Nasca Octavian Paul (Paul Nasca)
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Some GUI code was taken from the Echo effect
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*******************************************************************//**
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\class EffectPaulstretch
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\brief An Extreme Time Stretch and Time Smear effect
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*//*******************************************************************/
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#include "../Audacity.h"
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#include "Paulstretch.h"
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#include <algorithm>
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#include <math.h>
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#include <float.h>
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#include <wx/intl.h>
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#include <wx/valgen.h>
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#include "../ShuttleGui.h"
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#include "../FFT.h"
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#include "../widgets/valnum.h"
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#include "../Prefs.h"
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#include "../WaveTrack.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( Amount, float, XO("Stretch Factor"), 10.0, 1.0, FLT_MAX, 1 );
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Param( Time, float, XO("Time Resolution"), 0.25f, 0.00099f, FLT_MAX, 1 );
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class PaulStretch
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{
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public:
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PaulStretch(float rap_,int in_bufsize_,float samplerate_);
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//in_bufsize is also a half of a FFT buffer (in samples)
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virtual ~PaulStretch();
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void process(float *smps,int nsmps);
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int in_bufsize;
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int poolsize;//how many samples are inside the input_pool size (need to know how many samples to fill when seeking)
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int out_bufsize;
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float *out_buf;
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int get_nsamples();//how many samples are required to be added in the pool next time
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int get_nsamples_for_fill();//how many samples are required to be added for a complete buffer refill (at start of the song or after seek)
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void set_rap(float newrap);//set the current stretch value
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protected:
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void process_spectrum(float *WXUNUSED(freq)) {};
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float samplerate;
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private:
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float *in_pool;//de marimea in_bufsize
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float rap;
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float *old_out_smp_buf;
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float *fft_smps,*fft_c,*fft_s,*fft_freq,*fft_tmp;
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double remained_samples;//how many fraction of samples has remained (0..1)
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};
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//
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// EffectPaulstretch
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//
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BEGIN_EVENT_TABLE(EffectPaulstretch, wxEvtHandler)
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EVT_TEXT(wxID_ANY, EffectPaulstretch::OnText)
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END_EVENT_TABLE()
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EffectPaulstretch::EffectPaulstretch()
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{
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mAmount = DEF_Amount;
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mTime_resolution = DEF_Time;
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SetLinearEffectFlag(true);
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}
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EffectPaulstretch::~EffectPaulstretch()
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{
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}
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// IdentInterface implementation
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wxString EffectPaulstretch::GetSymbol()
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{
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return PAULSTRETCH_PLUGIN_SYMBOL;
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}
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wxString EffectPaulstretch::GetDescription()
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{
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return XO("Use Paulstretch only for an extreme time-stretch or \"stasis\" effect");
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}
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// EffectIdentInterface implementation
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EffectType EffectPaulstretch::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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bool EffectPaulstretch::GetAutomationParameters(EffectAutomationParameters & parms)
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{
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parms.WriteFloat(KEY_Amount, mAmount);
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parms.WriteFloat(KEY_Time, mTime_resolution);
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return true;
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}
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bool EffectPaulstretch::SetAutomationParameters(EffectAutomationParameters & parms)
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{
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ReadAndVerifyFloat(Amount);
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ReadAndVerifyFloat(Time);
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mAmount = Amount;
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mTime_resolution = Time;
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return true;
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}
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// Effect implementation
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double EffectPaulstretch::CalcPreviewInputLength(double previewLength)
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{
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// FIXME: Preview is currently at the project rate, but should really be
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// at the track rate (bugs 1284 and 852).
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int minDuration = GetBufferSize(mProjectRate) * 2 + 1;
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// Preview playback may need to be trimmed but this is the smallest selection that we can use.
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double minLength = std::max<double>(minDuration / mProjectRate, previewLength / mAmount);
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return minLength;
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}
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bool EffectPaulstretch::Process()
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{
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CopyInputTracks();
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SelectedTrackListOfKindIterator iter(Track::Wave, mOutputTracks.get());
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WaveTrack *track = (WaveTrack *) iter.First();
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m_t1=mT1;
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int count=0;
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while (track) {
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double trackStart = track->GetStartTime();
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double trackEnd = track->GetEndTime();
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double t0 = mT0 < trackStart? trackStart: mT0;
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double t1 = mT1 > trackEnd? trackEnd: mT1;
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if (t1 > t0) {
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if (!ProcessOne(track, t0,t1,count))
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return false;
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}
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track = (WaveTrack *) iter.Next();
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count++;
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}
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mT1=m_t1;
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ReplaceProcessedTracks(true);
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return true;
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}
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void EffectPaulstretch::PopulateOrExchange(ShuttleGui & S)
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{
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S.StartMultiColumn(2, wxALIGN_CENTER);
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{
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FloatingPointValidator<float> vldAmount(1, &mAmount);
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vldAmount.SetMin(MIN_Amount);
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/* i18n-hint: This is how many times longer the sound will be, e.g. applying
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* the effect to a 1-second sample, with the default Stretch Factor of 10.0
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* will give an (approximately) 10 second sound
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*/
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S.AddTextBox(_("Stretch Factor:"), wxT(""), 10)->SetValidator(vldAmount);
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FloatingPointValidator<float> vldTime(3, &mTime_resolution, NUM_VAL_ONE_TRAILING_ZERO);
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vldTime.SetMin(MIN_Time);
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S.AddTextBox(_("Time Resolution (seconds):"), wxT(""), 10)->SetValidator(vldTime);
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}
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S.EndMultiColumn();
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};
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bool EffectPaulstretch::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 EffectPaulstretch::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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// EffectPaulstretch implementation
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void EffectPaulstretch::OnText(wxCommandEvent & WXUNUSED(evt))
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{
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EnableApply(mUIParent->TransferDataFromWindow());
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}
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int EffectPaulstretch::GetBufferSize(double rate)
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{
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// Audacity's fft requires a power of 2
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float tmp = rate * mTime_resolution / 2.0;
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tmp = log(tmp) / log(2.0);
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tmp = pow(2.0, floor(tmp + 0.5));
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return std::max<int>((int)tmp, 128);
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}
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bool EffectPaulstretch::ProcessOne(WaveTrack *track,double t0,double t1,int count)
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{
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int stretch_buf_size = GetBufferSize(track->GetRate());
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double amount = this->mAmount;
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auto start = track->TimeToLongSamples(t0);
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auto end = track->TimeToLongSamples(t1);
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auto len = end - start;
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int minDuration = stretch_buf_size * 2 + 1;
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if (len < minDuration){ //error because the selection is too short
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float maxTimeRes = log(len) / log(2.0);
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maxTimeRes = pow(2.0, floor(maxTimeRes) + 0.5);
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maxTimeRes = maxTimeRes / track->GetRate();
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if (this->IsPreviewing()) {
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double defaultPreviewLen;
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gPrefs->Read(wxT("/AudioIO/EffectsPreviewLen"), &defaultPreviewLen, 6.0);
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/* i18n-hint: 'Time Resolution' is the name of a control in the Paulstretch effect.*/
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if ((minDuration / mProjectRate) < defaultPreviewLen) {
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::wxMessageBox (wxString::Format(_("Audio selection too short to preview.\n\n"
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"Try increasing the audio selection to at least %.1f seconds,\n"
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"or reducing the 'Time Resolution' to less than %.1f seconds."),
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(minDuration / track->GetRate()) + 0.05, // round up to 1/10 s.
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floor(maxTimeRes * 10.0) / 10.0),
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GetName(), wxOK | wxICON_EXCLAMATION);
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}
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else {
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/* i18n-hint: 'Time Resolution' is the name of a control in the Paulstretch effect.*/
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::wxMessageBox (wxString::Format(_("Unable to Preview.\n\n"
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"For the current audio selection, the maximum\n"
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"'Time Resolution' is %.1f seconds."),
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floor(maxTimeRes * 10.0) / 10.0),
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GetName(), wxOK | wxICON_EXCLAMATION);
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}
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}
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else {
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/* i18n-hint: 'Time Resolution' is the name of a control in the Paulstretch effect.*/
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::wxMessageBox (wxString::Format(_("The 'Time Resolution' is too long for the selection.\n\n"
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"Try increasing the audio selection to at least %.1f seconds,\n"
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"or reducing the 'Time Resolution' to less than %.1f seconds."),
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(minDuration / track->GetRate()) + 0.05, // round up to 1/10 s.
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floor(maxTimeRes * 10.0) / 10.0),
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GetName(), wxOK | wxICON_EXCLAMATION);
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}
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return false;
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}
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double adjust_amount=(double)len/((double)len-((double)stretch_buf_size*2.0));
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amount=1.0+(amount-1.0)*adjust_amount;
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auto outputTrack = mFactory->NewWaveTrack(track->GetSampleFormat(),track->GetRate());
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PaulStretch stretch(amount,stretch_buf_size,track->GetRate());
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auto nget = stretch.get_nsamples_for_fill();
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int bufsize=stretch.poolsize;
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float *buffer0=new float[bufsize];
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float *bufferptr0=buffer0;
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bool first_time=true;
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int fade_len=100;
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if (fade_len>(bufsize/2-1)) fade_len=bufsize/2-1;
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float *fade_track_smps=new float[fade_len];
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decltype(len) s=0;
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bool cancelled=false;
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while (s<len){
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track->Get((samplePtr)bufferptr0,floatSample,start+s,nget);
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stretch.process(buffer0,nget);
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if (first_time) {
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stretch.process(buffer0,0);
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};
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s+=nget;
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if (first_time){//blend the the start of the selection
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track->Get((samplePtr)fade_track_smps,floatSample,start,fade_len);
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first_time=false;
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for (int i=0;i<fade_len;i++){
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float fi=(float)i/(float)fade_len;
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stretch.out_buf[i]=stretch.out_buf[i]*fi+(1.0-fi)*fade_track_smps[i];
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};
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};
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if (s>=len){//blend the end of the selection
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track->Get((samplePtr)fade_track_smps,floatSample,end-fade_len,fade_len);
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for (int i=0;i<fade_len;i++){
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float fi=(float)i/(float)fade_len;
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int i2=bufsize/2-1-i;
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stretch.out_buf[i2]=stretch.out_buf[i2]*fi+(1.0-fi)*fade_track_smps[fade_len-1-i];
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};
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};
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outputTrack->Append((samplePtr)stretch.out_buf,floatSample,stretch.out_bufsize);
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nget=stretch.get_nsamples();
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if (TrackProgress(count, (s / (double) len))) {
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cancelled=true;
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break;
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};
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};
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delete [] fade_track_smps;
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outputTrack->Flush();
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track->Clear(t0,t1);
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bool success = track->Paste(t0, outputTrack.get());
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if (!cancelled && success){
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m_t1 = mT0 + outputTrack->GetEndTime();
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}
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delete []buffer0;
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return !cancelled;
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};
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/*************************************************************/
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PaulStretch::PaulStretch(float rap_,int in_bufsize_,float samplerate_)
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{
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samplerate=samplerate_;
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rap=rap_;
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in_bufsize=in_bufsize_;
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if (rap<1.0) rap=1.0;
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out_bufsize=in_bufsize;
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if (out_bufsize<8) out_bufsize=8;
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out_buf=new float[out_bufsize];
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old_out_smp_buf=new float[out_bufsize*2];for (int i=0;i<out_bufsize*2;i++) old_out_smp_buf[i]=0.0;
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poolsize=in_bufsize_*2;
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in_pool=new float[poolsize];for (int i=0;i<poolsize;i++) in_pool[i]=0.0;
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remained_samples=0.0;
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fft_smps=new float[poolsize];
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fft_s=new float[poolsize];
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fft_c=new float[poolsize];
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fft_freq=new float[poolsize];
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fft_tmp=new float[poolsize];
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for (int i=0;i<poolsize;i++) {
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fft_smps[i]=0.0;
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fft_c[i]=0.0;
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fft_s[i]=0.0;
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fft_freq[i]=0.0;
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}
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}
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PaulStretch::~PaulStretch()
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{
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delete [] out_buf;
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delete [] old_out_smp_buf;
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delete [] in_pool;
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delete [] fft_smps;
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delete [] fft_c;
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delete [] fft_s;
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delete [] fft_freq;
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delete [] fft_tmp;
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}
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void PaulStretch::set_rap(float newrap)
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{
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if (rap>=1.0) rap=newrap;
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else rap=1.0;
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}
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void PaulStretch::process(float *smps,int nsmps)
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{
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//add NEW samples to the pool
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if ((smps!=NULL)&&(nsmps!=0)){
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if (nsmps>poolsize){
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nsmps=poolsize;
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}
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int nleft=poolsize-nsmps;
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//move left the samples from the pool to make room for NEW samples
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for (int i=0;i<nleft;i++) in_pool[i]=in_pool[i+nsmps];
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//add NEW samples to the pool
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for (int i=0;i<nsmps;i++) in_pool[i+nleft]=smps[i];
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}
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//get the samples from the pool
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for (int i=0;i<poolsize;i++) fft_smps[i]=in_pool[i];
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WindowFunc(3,poolsize,fft_smps);
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RealFFT(poolsize,fft_smps,fft_c,fft_s);
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for (int i=0;i<poolsize/2;i++) fft_freq[i]=sqrt(fft_c[i]*fft_c[i]+fft_s[i]*fft_s[i]);
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process_spectrum(fft_freq);
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//put randomize phases to frequencies and do a IFFT
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float inv_2p15_2pi=1.0/16384.0*(float)M_PI;
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for (int i=1;i<poolsize/2;i++){
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unsigned int random=(rand())&0x7fff;
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float phase=random*inv_2p15_2pi;
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float s=fft_freq[i]*sin(phase);
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float c=fft_freq[i]*cos(phase);
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fft_c[i]=fft_c[poolsize-i]=c;
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fft_s[i]=s;fft_s[poolsize-i]=-s;
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}
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fft_c[0]=fft_s[0]=0.0;
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fft_c[poolsize/2]=fft_s[poolsize/2]=0.0;
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FFT(poolsize,true,fft_c,fft_s,fft_smps,fft_tmp);
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float max=0.0,max2=0.0;
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for (int i=0;i<poolsize;i++){
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float a=fabs(fft_tmp[i]);
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if (a>max) max=a;
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float b=fabs(fft_smps[i]);
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if (b>max2) max2=b;
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}
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//make the output buffer
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float tmp=1.0/(float) out_bufsize*M_PI;
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float hinv_sqrt2=0.853553390593f;//(1.0+1.0/sqrt(2))*0.5;
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float ampfactor=1.0;
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if (rap<1.0) ampfactor=rap*0.707;
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else ampfactor=(out_bufsize/(float)poolsize)*4.0;
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for (int i=0;i<out_bufsize;i++) {
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float a=(0.5+0.5*cos(i*tmp));
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float out=fft_smps[i+out_bufsize]*(1.0-a)+old_out_smp_buf[i]*a;
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out_buf[i]=out*(hinv_sqrt2-(1.0-hinv_sqrt2)*cos(i*2.0*tmp))*ampfactor;
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}
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//copy the current output buffer to old buffer
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for (int i=0;i<out_bufsize*2;i++) old_out_smp_buf[i]=fft_smps[i];
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}
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int PaulStretch::get_nsamples()
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{
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double r=out_bufsize/rap;
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int ri=(int)floor(r);
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double rf=r-floor(r);
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remained_samples+=rf;
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if (remained_samples>=1.0){
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ri+=(int)floor(remained_samples);
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remained_samples=remained_samples-floor(remained_samples);
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}
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if (ri>poolsize){
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ri=poolsize;
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}
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return ri;
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}
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int PaulStretch::get_nsamples_for_fill()
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{
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return poolsize;
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}
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