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/**********************************************************************
Audacity: A Digital Audio Editor
Invert.cpp
Mark Phillips
This class inverts the selected audio.
**********************************************************************/
#include "Invert.h"
#include "../WaveTrack.h"
//
// EffectInvert
//
EffectInvert::EffectInvert()
{
}
bool EffectInvert::Process()
{
TrackListIterator iter(mWaveTracks);
VTrack *t = iter.First();
int count = 0;
while(t) {
sampleCount start, len;
GetSamples((WaveTrack *)t, &start, &len);
bool success = ProcessOne(count, (WaveTrack *)t, start, len);
if (!success)
return false;
t = iter.Next();
count++;
}
return true;
}
bool EffectInvert::ProcessOne(int count, WaveTrack *t,
sampleCount start, sampleCount len)
{
// keep track of two blocks whose data we will swap
sampleCount s = start;
sampleCount originalLen = len;
sampleCount blockSize = t->GetMaxBlockSize();
sampleType *buffer = new sampleType[blockSize];
while (len > 0) {
unsigned int block = t->GetBestBlockSize(s);
if (block > len)
block = len;
t->Get(buffer, s, block);
for (unsigned int i = 0; i < block; i++) {
buffer[i] = (sampleType) (-buffer[i]);
}
t->Set(buffer, s, block);
len -= block;
s += block;
if (TrackProgress(count, (s-start)/(double)originalLen))
break;
}
delete[] buffer;
return true;
}
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