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piano.cpp
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piano.cpp
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#include <unistd.h>
#include <vector>
#include <map>
#include <iostream>
#include <mutex>
#include <limits>
#include <thread>
#include <csignal>
#include <chrono>
#include <opencv2/opencv.hpp>
#include "../lib/canvas.hpp"
#include "../lib/button.hpp"
#include "../lib/color.hpp"
#include "../lib/midikeyboard.hpp"
using namespace std::chrono;
constexpr off_t WIDTH = 100;
constexpr off_t HEIGHT = 10;
constexpr size_t MAGNIFICATION = 18;
constexpr size_t MIN_NOTE_VAL = 48;
constexpr size_t MAX_NOTE_VAL = 72;
struct NoteState {
uint64_t timestamp_ = 0;
bool on_ = false;
uint8_t velocity_;
};
std::map<size_t, NoteState> NOTE_STATE_MAP;
std::mutex EVMTX;
NoteEvent EVENT;
bool DONE;
static void FINISH(int ignore) {
DONE = true;
}
void blend(const cv::Mat& src1, const cv::Mat& src2, const double alpha,
const cv::Mat& dst) {
using namespace cv;
double beta;
beta = (1.0 - alpha);
addWeighted(src1, alpha, src2, beta, 0.0, dst);
}
void drawNote(const NoteEvent& ev, cv::Mat& m) {
uint64_t epoch =
std::chrono::system_clock::now().time_since_epoch() /
std::chrono::milliseconds(1);
HSLColor hsl;
// std::cerr << ev.note_ << '\t' << ev.on_ << std::endl;
if(ev.note_ < MIN_NOTE_VAL || ev.note_ > MAX_NOTE_VAL)
return;
NOTE_STATE_MAP[ev.note_ - MIN_NOTE_VAL] = {epoch, ev.on_, ev.velocity_};
cv::rectangle(m, cv::Point(0, 0), cv::Point(WIDTH, HEIGHT), { 0, 0, 0 },
CV_FILLED);
for (auto& p : NOTE_STATE_MAP) {
// std::cerr << p.first << '\t' << p.second << '\t';
size_t note = p.first;
if (p.second.on_ && p.second.timestamp_ > epoch - 100 ) {
hsl.h_ = (double) note / (MAX_NOTE_VAL - MIN_NOTE_VAL) * 360.0;
hsl.s_ = 99;
hsl.l_ = 70;
RGBColor rgb(hsl);
cv::rectangle(m, cv::Point(note * 4, 0), cv::Point(note * 4 + 3, (double)HEIGHT * ((p.second.velocity_ + 1) / 127.0)),
cv::Scalar(rgb.b_, rgb.g_, rgb.r_), CV_FILLED);
} else {
cv::rectangle(m, cv::Point(note * 4, 0), cv::Point(note * 4 + 3, HEIGHT),
cv::Scalar(0,0,0), CV_FILLED);
}
}
// std::cerr << std::endl;
}
int main(int argc, char** argv) {
if (argc != 3) {
std::cerr << "Usage: piano <input-midi-port-nr> <output-midi-port-nr>..." << std::endl;
exit(1);
}
for(size_t i = 0; i < MAX_NOTE_VAL - MIN_NOTE_VAL; ++i) {
NOTE_STATE_MAP[i] = {0, false, 0};
}
DONE = false;
signal(SIGINT, FINISH);
Canvas* canvas = new Canvas(WIDTH * MAGNIFICATION, HEIGHT * MAGNIFICATION, false);
MidiKeyboard midi(atoi(argv[1]));
std::thread midiThread([&]() {
while(true) {
EVMTX.lock();
EVENT = midi.receive();
EVMTX.unlock();
std::this_thread::yield();
usleep( 1000 );
}
});
SDL_Event event;
cv::Mat* last = new cv::Mat(HEIGHT, WIDTH, CV_8UC4);
cv::Mat* now = new cv::Mat(HEIGHT, WIDTH, CV_8UC4);
cv::Mat* result = new cv::Mat(HEIGHT, WIDTH, CV_8UC4);
bool first = true;
while (!DONE) {
if (SDL_PollEvent(&event)) {
if (event.type == SDL_QUIT) {
exit(0);
}
}
drawNote(EVENT, *now);
if(!first) {
blend(*now, *last, 0.1,*result);
} else {
now->copyTo(*result);
first = false;
}
canvas->draw(*result);
result->copyTo(*last);
std::this_thread::yield();
usleep(16667);
}
midiThread.join();
return 0;
}