101 lines
2.7 KiB
C++
101 lines
2.7 KiB
C++
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// SPDX-License-Identifier: BSD-2-Clause
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// This code is part of the sfizz library and is licensed under a BSD 2-clause
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// license. You should have receive a LICENSE.md file along with the code.
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// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
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/**
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This program generates the data file of a LFO output recorded for a fixed
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duration. The file contains columns for each LFO in the SFZ region.
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The columns are: Time, Lfo1, ... LfoN
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One can use Gnuplot to display this data.
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Example:
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sfizz_plot_lfo file.sfz > lfo.dat
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gnuplot
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plot "lfo.dat" using 1:2 with lines
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*/
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#include "sfizz/Synth.h"
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#include "sfizz/LFO.h"
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#include "sfizz/LFODescription.h"
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#include <absl/types/span.h>
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#include <vector>
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#include <iostream>
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#include <cmath>
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//==============================================================================
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static constexpr double sampleRate = 44100.0; // sample rate used to compute
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static constexpr double duration = 5.0; // length in seconds
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/**
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Print usage information
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*/
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static void usage()
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{
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std::cerr << "Usage: sfizz_plot_lfo <file.sfz>" "\n";
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}
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static std::vector<sfz::LFODescription> lfoDescriptionFromSfzFile(const fs::path &sfzPath, bool &success)
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{
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sfz::Synth synth;
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if (!synth.loadSfzFile(sfzPath)) {
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std::cerr << "Cannot load the SFZ file.\n";
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success = false;
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return {};
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}
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if (synth.getNumRegions() != 1) {
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std::cerr << "The SFZ file must contain exactly one region.\n";
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success = false;
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return {};
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}
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success = true;
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return synth.getRegionView(0)->lfos;
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}
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/**
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Program which loads LFO configuration and generates plot data for the given duration.
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*/
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int main(int argc, char* argv[])
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{
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if (argc < 2 || argc > 2) {
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usage();
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return 1;
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}
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fs::path sfzPath = argv[1];
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bool success = false;
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const std::vector<sfz::LFODescription> desc = lfoDescriptionFromSfzFile(sfzPath, success);
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if (!success)
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return 1;
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size_t numLfos = desc.size();
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std::vector<sfz::LFO> lfos(numLfos);
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for (size_t l = 0; l < numLfos; ++l) {
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lfos[l].setSampleRate(sampleRate);
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lfos[l].configure(&desc[l]);
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}
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size_t numFrames = (size_t)std::ceil(sampleRate * duration);
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std::vector<float> outputMemory(numLfos * numFrames);
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std::vector<absl::Span<float>> lfoOutputs(numLfos);
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for (size_t l = 0; l < numLfos; ++l) {
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lfoOutputs[l] = absl::MakeSpan(&outputMemory[l * numFrames], numFrames);
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lfos[l].process(lfoOutputs[l]);
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}
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for (size_t i = 0; i < numFrames; ++i) {
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std::cout << (i / sampleRate);
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for (size_t l = 0; l < numLfos; ++l)
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std::cout << ' ' << lfoOutputs[l][i];
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std::cout << '\n';
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}
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return 0;
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}
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