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/**********************************************************************
Audacity: A Digital Audio Editor
FilterFade.cpp
Dominic Mazzoni
**********************************************************************/
// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif
#include "Filter.h"
#include "FilterCompressor.h"
bool FilterCompressor::Prepare(WaveTrack * t, double t0, double t1,
sampleCount total)
{
wxString temp;
wxWindow *parent = NULL;
temp =
wxGetTextFromUser
("Please enter an increment (in milliseconds) to apply the filter to",
"Increment: ", "1", parent, -1, -1, TRUE);
if (temp == "")
return false;
while (sscanf((const char *) temp, "%d", &increment) < 0) {
temp = wxGetTextFromUser("Please enter a value greater than zero:",
"Increment: ", "1", parent, -1, -1, TRUE);
if (temp == "")
return false;
}
how_far = 0;
increment *= t->rate / 100;
return true;
}
void FilterCompressor::DoIt(sampleType * src, sampleType * dst,
sampleCount total, sampleCount x,
sampleCount len)
{
for (int i = 0; i < len; i++) {
if (how_far == 2 * increment)
how_far = 0;
if (how_far == 0) {
for (int i2 = i; i2 < len && i2 <= increment; i2++) {
if (i2 == i)
max_region = src[i];
else if (src[i2] > max_region)
max_region = src[i2];
}
} else if (how_far <= increment) {
dst[i] = (sampleType) (src[i] * 32767 / max_region);
} else
dst[i] = (sampleType) (src[i]);
++how_far;
}
}
}
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