182 lines
4.8 KiB
C++
182 lines
4.8 KiB
C++
/**********************************************************************
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Audacity: A Digital Audio Editor
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StereoToMono.cpp
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Lynn Allan
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*******************************************************************//**
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\class EffectStereoToMono
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\brief An Effect to convert stereo to mono.
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*//*******************************************************************/
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#include "../Audacity.h"
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#include "StereoToMono.h"
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#include <wx/intl.h>
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#include "../Project.h"
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#include "../WaveTrack.h"
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EffectStereoToMono::EffectStereoToMono()
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{
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}
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EffectStereoToMono::~EffectStereoToMono()
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{
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}
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// IdentInterface implementation
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wxString EffectStereoToMono::GetSymbol()
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{
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return STEREOTOMONO_PLUGIN_SYMBOL;
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}
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wxString EffectStereoToMono::GetDescription()
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{
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return XO("Converts stereo tracks to mono");
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}
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// EffectIdentInterface implementation
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EffectType EffectStereoToMono::GetType()
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{
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// Really EffectTypeProcess, but this prevents it from showing in the Effect Menu
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return EffectTypeHidden;
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}
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bool EffectStereoToMono::IsInteractive()
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{
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return false;
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}
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// EffectClientInterface implementation
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int EffectStereoToMono::GetAudioInCount()
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{
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return 2;
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}
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int EffectStereoToMono::GetAudioOutCount()
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{
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return 1;
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}
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// Effect implementatino
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bool EffectStereoToMono::Process()
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{
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// Do not use mWaveTracks here. We will possibly DELETE tracks,
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// so we must use the "real" tracklist.
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this->CopyInputTracks(); // Set up mOutputTracks.
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bool bGoodResult = true;
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SelectedTrackListOfKindIterator iter(Track::Wave, mOutputTracks);
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mLeftTrack = (WaveTrack *)iter.First();
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bool refreshIter = false;
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if(mLeftTrack)
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{
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// create a NEW WaveTrack to hold all of the output
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AudacityProject *p = GetActiveProject();
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mOutTrack = p->GetTrackFactory()->NewWaveTrack(floatSample, mLeftTrack->GetRate());
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}
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int count = 0;
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while (mLeftTrack) {
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if (mLeftTrack->GetKind() == Track::Wave &&
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mLeftTrack->GetSelected() &&
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mLeftTrack->GetLinked()) {
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mRightTrack = (WaveTrack *)iter.Next();
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if ((mLeftTrack->GetRate() == mRightTrack->GetRate())) {
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sampleCount leftTrackStart = mLeftTrack->TimeToLongSamples(mLeftTrack->GetStartTime());
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sampleCount rightTrackStart = mRightTrack->TimeToLongSamples(mRightTrack->GetStartTime());
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mStart = wxMin(leftTrackStart, rightTrackStart);
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sampleCount leftTrackEnd = mLeftTrack->TimeToLongSamples(mLeftTrack->GetEndTime());
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sampleCount rightTrackEnd = mRightTrack->TimeToLongSamples(mRightTrack->GetEndTime());
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mEnd = wxMax(leftTrackEnd, rightTrackEnd);
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bGoodResult = ProcessOne(count);
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if (!bGoodResult)
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break;
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mOutTrack->Clear(mOutTrack->GetStartTime(), mOutTrack->GetEndTime());
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// The right channel has been deleted, so we must restart from the beginning
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refreshIter = true;
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}
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}
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if (refreshIter) {
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mLeftTrack = (WaveTrack *)iter.First();
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refreshIter = false;
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}
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else {
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mLeftTrack = (WaveTrack *)iter.Next();
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}
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count++;
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}
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this->ReplaceProcessedTracks(bGoodResult);
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return bGoodResult;
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}
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bool EffectStereoToMono::ProcessOne(int count)
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{
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float curLeftFrame;
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float curRightFrame;
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float curMonoFrame;
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sampleCount idealBlockLen = mLeftTrack->GetMaxBlockSize() * 2;
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sampleCount index = mStart;
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float *leftBuffer = new float[idealBlockLen];
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float *rightBuffer = new float[idealBlockLen];
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bool bResult = true;
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while (index < mEnd) {
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bResult &= mLeftTrack->Get((samplePtr)leftBuffer, floatSample, index, idealBlockLen);
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bResult &= mRightTrack->Get((samplePtr)rightBuffer, floatSample, index, idealBlockLen);
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sampleCount limit = idealBlockLen;
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if ((index + idealBlockLen) > mEnd) {
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limit = mEnd - index;
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}
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for (sampleCount i = 0; i < limit; ++i) {
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index++;
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curLeftFrame = leftBuffer[i];
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curRightFrame = rightBuffer[i];
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curMonoFrame = (curLeftFrame + curRightFrame) / 2.0;
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leftBuffer[i] = curMonoFrame;
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}
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bResult &= mOutTrack->Append((samplePtr)leftBuffer, floatSample, limit);
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if (TrackProgress(count, 2.*((double)index / (double)(mEnd - mStart))))
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return false;
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}
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double minStart = wxMin(mLeftTrack->GetStartTime(), mRightTrack->GetStartTime());
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bResult &= mLeftTrack->Clear(mLeftTrack->GetStartTime(), mLeftTrack->GetEndTime());
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bResult &= mOutTrack->Flush();
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bResult &= mLeftTrack->Paste(minStart, mOutTrack.get());
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mLeftTrack->SetLinked(false);
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mRightTrack->SetLinked(false);
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mLeftTrack->SetChannel(Track::MonoChannel);
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mOutputTracks->Remove(mRightTrack);
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delete [] leftBuffer;
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delete [] rightBuffer;
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return bResult;
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}
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bool EffectStereoToMono::IsHidden()
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{
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return true;
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}
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