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/**********************************************************************
Audacity: A Digital Audio Editor
Fade.cpp
Robert Leidle
**********************************************************************/
#include <wx/generic/textdlgg.h>
#include "Fade.h"
#include "../WaveTrack.h"
bool EffectFadeIn::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 EffectFadeIn::ProcessOne(int count, WaveTrack * t,
sampleCount start, sampleCount len)
{
sampleCount s = start;
sampleCount blockSize = t->GetMaxBlockSize();
sampleType *buffer = new sampleType[blockSize];
sampleCount originalLen = len;
while ((s - start) < len) {
sampleCount block = t->GetBestBlockSize(s);
if (s - start + block > len)
block = start + len - s;
t->Get(buffer, s, block);
for (sampleCount i = 0; i < block; i++)
buffer[i] = (sampleType) (buffer[i]
* (float) (s + i - start)
/ (float) (len));
t->Set(buffer, s, block);
s += block;
if (TrackProgress(count, (s-start)/(double)originalLen))
break;
}
delete[]buffer;
return true;
}
bool EffectFadeOut::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 EffectFadeOut::ProcessOne(int count, WaveTrack * t,
sampleCount start, sampleCount len)
{
sampleCount s = start;
sampleCount blockSize = t->GetMaxBlockSize();
sampleType *buffer = new sampleType[blockSize];
sampleCount originalLen = len;
while ((s - start) < len) {
sampleCount block = t->GetBestBlockSize(s);
if (s - start + block > len)
block = start + len - s;
t->Get(buffer, s, block);
for (sampleCount i = 0; i < block; i++)
buffer[i] = (sampleType) (buffer[i]
* (float) (len - 1 - (s + i - start))
/ (float) (len));
t->Set(buffer, s, block);
s += block;
if (TrackProgress(count, (s-start)/(double)originalLen))
break;
}
delete[]buffer;
return true;
}
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