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/**********************************************************************
Audacity: A Digital Audio Editor
Reverse.cpp
Mark Phillips
This class reverses the selected audio.
**********************************************************************/
#include "Reverse.h"
#include "../WaveTrack.h"
//
// EffectReverse
//
EffectReverse::EffectReverse()
{
}
bool EffectReverse::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 EffectReverse::ProcessOne(int count, WaveTrack *t,
sampleCount start, sampleCount len)
{
// keep track of two blocks whose data we will swap
sampleCount first = start, second;
sampleCount originalLen = len;
sampleCount blockSize = t->GetMaxBlockSize();
sampleType tmp;
sampleType *buffer1 = new sampleType[blockSize],
*buffer2 = new sampleType[blockSize];
while (len > 1) {
unsigned int block = t->GetBestBlockSize(first);
if (block > len / 2)
block = len / 2;
second = first + len - block;
t->Get(buffer1, first, block);
t->Get(buffer2, second, block);
for (unsigned int i = 0; i < block; i++) {
tmp = buffer1[i];
buffer1[i] = buffer2[block-i-1];
buffer2[block-i-1] = tmp;
}
t->Set(buffer1, first, block);
t->Set(buffer2, second, block);
len -= 2 * block;
first += block;
if (TrackProgress(count, 2*(first-start)/(double)originalLen))
break;
}
delete[] buffer1;
delete[] buffer2;
return true;
}
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