95 lines
2.4 KiB
C++
95 lines
2.4 KiB
C++
|
// SPDX-License-Identifier: BSD-2-Clause
|
||
|
|
|
||
|
|
// This code is part of the sfizz library and is licensed under a BSD 2-clause
|
||
|
|
// license. You should have receive a LICENSE.md file along with the code.
|
||
|
|
// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
|
||
|
|
|
||
|
|
/**
|
||
|
|
This program generates the data file of a LFO output recorded for a fixed
|
||
|
|
duration. The file contains columns for each LFO in the SFZ region.
|
||
|
|
The columns are: Time, Lfo1, ... LfoN
|
||
|
|
One can use Gnuplot to display this data.
|
||
|
|
Example:
|
||
|
|
sfizz_plot_lfo file.sfz > lfo.dat
|
||
|
|
gnuplot
|
||
|
|
plot "lfo.dat" using 1:2 with lines
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "sfizz/Curve.h"
|
||
|
|
#include "sfizz/Parser.h"
|
||
|
|
#include "absl/strings/numbers.h"
|
||
|
|
#include "absl/types/span.h"
|
||
|
|
#include <iostream>
|
||
|
|
#include <cmath>
|
||
|
|
|
||
|
|
//==============================================================================
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Print usage information
|
||
|
|
*/
|
||
|
|
static void usage()
|
||
|
|
{
|
||
|
|
std::cerr << "Usage: sfizz_plot_curve <index> [file.sfz]"
|
||
|
|
<< "\n";
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Parser which extracts the configuration of curves
|
||
|
|
*/
|
||
|
|
class CurveParser : public sfz::Parser {
|
||
|
|
public:
|
||
|
|
explicit CurveParser(sfz::CurveSet& curveSet)
|
||
|
|
: curveSet(curveSet)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
void callback(absl::string_view header, const std::vector<sfz::Opcode>& members) override
|
||
|
|
{
|
||
|
|
if (header == "effect")
|
||
|
|
curveSet.addCurveFromHeader(members);
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
sfz::CurveSet& curveSet;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Program which loads LFO configuration and generates plot data for the given duration.
|
||
|
|
*/
|
||
|
|
int main(int argc, char* argv[])
|
||
|
|
{
|
||
|
|
if (argc < 2 || argc > 3)
|
||
|
|
return usage(), 1;
|
||
|
|
|
||
|
|
int curveIndex = -1;
|
||
|
|
if (!absl::SimpleAtoi(argv[1], &curveIndex))
|
||
|
|
return usage(), 1;
|
||
|
|
|
||
|
|
std::string filePath;
|
||
|
|
if (argc > 2)
|
||
|
|
filePath = argv[2];
|
||
|
|
|
||
|
|
///
|
||
|
|
sfz::CurveSet curveSet = sfz::CurveSet::createPredefined();
|
||
|
|
|
||
|
|
if (!filePath.empty()) {
|
||
|
|
CurveParser parser(curveSet);
|
||
|
|
if (!parser.loadSfzFile(filePath)) {
|
||
|
|
std::cerr << "Cannot load SFZ: " << filePath << "\n";
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
///
|
||
|
|
const sfz::Curve& curve = curveSet.getCurve(curveIndex);
|
||
|
|
|
||
|
|
constexpr unsigned numSamples = 1024; // number of points to evaluate
|
||
|
|
|
||
|
|
for (unsigned i = 0; i < numSamples; ++i) {
|
||
|
|
float x = i * (1.0f / (numSamples - 1));
|
||
|
|
std::cout << x << ' ' << curve.evalNormalized(x) << '\n';
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|