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// envelope.C
/******************************************************************************
*
* MiXViews - an X window system based sound & data editor/processor
*
* Copyright (c) 1993, 1994 Regents of the University of California
*
* Author: Douglas Scott
* Date: December 13, 1994
*
* Permission to use, copy and modify this software and its documentation
* for research and/or educational purposes and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation. The author reserves the right to distribute this
* software and its documentation. The University of California and the author
* make no representations about the suitability of this software for any
* purpose, and in no event shall University of California be liable for any
* damage, loss of data, or profits resulting from its use.
* It is provided "as is" without express or implied warranty.
*
******************************************************************************/
#ifdef __GNUG__
#pragma implementation
#endif
#include "localdefs.h"
#include "controller.h"
#include "envelope.h"
#include "header.h"
#include "request.h"
Envelope::Envelope() : FrameData(FloatData, DefaultEnvelopeSize, 1, 44100, 1.0) {
init();
setMappingLength(DefaultEnvelopeSize);
}
Envelope::Envelope(int len) : FrameData(FloatData, len, 1, 44100, 1.0) {
init();
setMappingLength(len);
}
Envelope::~Envelope() {
delete [] frameLabel;
delete [] channelLabel;
}
Data *
Envelope::newData() { return new Envelope(this); }
Data *
Envelope::newData(int len) { return new Envelope(this, len); }
Data *
Envelope::clone(const Range &r) { return new Envelope(this, r); }
Data *
Envelope::clone(const Range &r, const Range &c) {
return new Envelope(this, r, c);
}
void
Envelope::information(Controller *controller) {
AlertRequest request("Envelope Information:");
request.setBell(false);
char str[128];
request.appendLabel("------------");
request.appendLabel("Filename: ", controller->fileName());
request.appendLabel("Number of Frames: ", toString(str, length()));
request.appendLabel("File Size (bytes): ", toString(str, sizeInBytes()));
controller->handleRequest(request);
}
void
Envelope::init() {
frameLabel = nil;
channelLabel = nil;
rangeFactor = 1;
rangeOffset = 0;
reset();
}
void
Envelope::reset() {
currentVal = get(0);
nextVal = currentVal;
currentIndex = fraction = oldindex = 0;
}
void
Envelope::checkValues() {
Super::checkValues();
reset();
}
// this returns a linearly interpolated value from the array
double
Envelope::next() {
int index = int(currentIndex);
if(index > oldindex) { // only get new values if index moves up
currentVal = nextVal;
nextVal = get(index+1);
oldindex = index;
}
fraction = currentIndex - index;
currentIndex += increment;
return (currentVal + fraction * (nextVal - currentVal));
}
// Envelope objects may want to have a custom label for the horizontal scale
void
Envelope::setFrameRangeLabel(const char* label) {
delete [] frameLabel;
frameLabel = newstr(label);
}
Range
Envelope::frameRange(RangeUnit) const {
Range fr = Super::frameRange(FrameUnit); // always use frame units
fr *= rangeFactor;
fr += int(rangeOffset);
return fr;
}
void
Envelope::setChannelName(const char* name) {
delete [] channelLabel;
channelLabel = newstr(name);
}
const char *
Envelope::frameRangeLabel(RangeUnit units) const {
return frameLabel ? frameLabel : Data::frameRangeLabel(units);
}
const char *
Envelope::channelName(int chan) const {
static char string[16];
if(channelLabel)
return channelLabel;
else {
sprintf(string, "Amp, Ch. %d", chan);
return string;
}
}
// protected
Header *
Envelope::createHeader(DataFile *, boolean reading) {
Header *hdr = new EnvelopeHeader(nFrames(), sRate());
if(!reading) configureHeader(hdr);
return hdr;
}
void
Envelope::readFromHeader(Header *h) {
Data::readFromHeader(h);
EnvelopeHeader *header = (EnvelopeHeader *) h;
sr = header->sampleRate();
}
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