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83 lines
2.2 KiB
C++
83 lines
2.2 KiB
C++
1 year ago
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// -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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// A program that reads frames form STDIN as RGB24, much like
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// https://github.com/polyfloyd/ledcat does.
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//
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// This code is public domain
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// (but note, that the led-matrix library this depends on is GPL v2)
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#include "led-matrix.h"
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#include <math.h>
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#include <signal.h>
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#include <stdio.h>
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#include <time.h>
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#include <unistd.h>
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#define FPS 60
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using rgb_matrix::RGBMatrix;
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using rgb_matrix::Canvas;
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volatile bool interrupt_received = false;
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static void InterruptHandler(int signo) {
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interrupt_received = true;
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}
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int main(int argc, char *argv[]) {
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RGBMatrix::Options defaults;
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defaults.hardware_mapping = "regular"; // or e.g. "adafruit-hat"
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defaults.rows = 32;
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defaults.chain_length = 1;
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defaults.parallel = 1;
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Canvas *canvas = RGBMatrix::CreateFromFlags(&argc, &argv, &defaults);
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if (canvas == NULL) {
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return 1;
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}
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// It is always good to set up a signal handler to cleanly exit when we
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// receive a CTRL-C for instance. The DrawOnCanvas() routine is looking
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// for that.
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signal(SIGTERM, InterruptHandler);
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signal(SIGINT, InterruptHandler);
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ssize_t frame_size = canvas->width() * canvas->height() * 3;
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uint8_t buf[frame_size];
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while (1) {
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struct timespec start;
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timespec_get(&start, TIME_UTC);
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ssize_t nread;
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ssize_t total_nread = 0;
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while ((nread = read(STDIN_FILENO, &buf[total_nread], frame_size - total_nread)) > 0) {
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if (interrupt_received) {
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return 1;
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}
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total_nread += nread;
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}
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if (total_nread < frame_size){
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break;
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}
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for (int y = 0; y < canvas->height(); y++) {
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for (int x = 0; x < canvas->width(); x++) {
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uint8_t *p = &buf[(y * canvas->width() + x) * 3];
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uint8_t r = *(p+0), g = *(p+1), b = *(p+2);
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canvas->SetPixel(x, y, r, g, b);
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}
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}
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struct timespec end;
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timespec_get(&end, TIME_UTC);
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long tudiff = (end.tv_nsec / 1000 + end.tv_sec * 1000000) - (start.tv_nsec / 1000 + start.tv_sec * 1000000);
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if (tudiff < 1000000l / FPS) {
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usleep(1000000l / FPS - tudiff);
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}
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}
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// Animation finished. Shut down the RGB matrix.
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canvas->Clear();
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delete canvas;
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return 0;
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}
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