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Add FPS rendering on top

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Harshit-Dhanwalkar 2026-05-24 17:13:03 +05:30
parent 9eaf33ea36
commit 8a79d2fece
6 changed files with 146 additions and 70 deletions
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58
C/src/main.c
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@ -15,11 +15,11 @@
#include <unistd.h>
// Defaults
#define DEFAULT_ASCII_WIDTH 80
#define DEFAULT_ASCII_HEIGHT 40
#define DEFAULT_CAPTURE_WIDTH 160
#define DEFAULT_ASCII_WIDTH 80
#define DEFAULT_ASCII_HEIGHT 40
#define DEFAULT_CAPTURE_WIDTH 160
#define DEFAULT_CAPTURE_HEIGHT 120
#define DEFAULT_FPS 20
#define DEFAULT_FPS 20
// Signal handling
volatile sig_atomic_t keep_running = 1;
@ -55,20 +55,22 @@ static void print_usage(const char *prog) {
" -C colour output (ANSI truecolor)\n"
" -D Floyd-Steinberg dithering\n",
prog, DEFAULT_CAPTURE_WIDTH, DEFAULT_CAPTURE_HEIGHT, DEFAULT_FPS,
DEFAULT_ASCII_WIDTH, DEFAULT_ASCII_HEIGHT, ASCII_CHARS_DEFAULT);
DEFAULT_ASCII_WIDTH, DEFAULT_ASCII_HEIGHT, ASCII_CHARS_DEFAULT); // FIX: undeclared identifier ASCII_CHARS_DEFAULT
}
// termios
void term_raw_mode(void) {
tcgetattr(STDOUT_FILENO, &orig_terminal);
tcgetattr(STDOUT_FILENO, &orig_terminal); // save stdin state
struct termios raw = orig_terminal;
raw.c_lflag &= ~(ICANON | ECHO); // no line buffering or no echo
raw.c_cc[VMIN] = 0; // non-blocking read
raw.c_lflag &= ~(ICANON | ECHO); // no line buffering or no echo
raw.c_cc[VMIN] = 0; // non-blocking read
raw.c_cc[VTIME] = 0;
tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw);
}
void term_restore(void) { tcsetattr(STDOUT_FILENO, TCSAFLUSH, &orig_terminal); }
void term_restore(void) { tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_terminal); }
fps_counter_t fps_calc = {0}; // Global FPS counter // FIX:
// Main
int main(int argc, char *argv[]) {
@ -77,13 +79,13 @@ int main(int argc, char *argv[]) {
// Config
char *device = "/dev/video0";
int ascii_w = DEFAULT_ASCII_WIDTH;
int ascii_h = DEFAULT_ASCII_HEIGHT;
int cap_w = DEFAULT_CAPTURE_WIDTH;
int cap_h = DEFAULT_CAPTURE_HEIGHT;
int fps = DEFAULT_FPS;
int ascii_w = DEFAULT_ASCII_WIDTH;
int ascii_h = DEFAULT_ASCII_HEIGHT;
int cap_w = DEFAULT_CAPTURE_WIDTH;
int cap_h = DEFAULT_CAPTURE_HEIGHT;
int fps = DEFAULT_FPS;
ascii_opts_t opts = {
ascii_opts_t opts = { // FIX: undcleared identifier 'ascii_opts_t'
.brightness = 0,
.contrast = 100,
.invert = 0,
@ -162,10 +164,12 @@ int main(int argc, char *argv[]) {
perror("webcam_init");
return 1;
}
fprintf(stderr, "Device: %s | capture %dx%d | ASCII %dx%d | %d fps%s%s%s\n",
fprintf(stderr, "Device: %s | capture %dx%d | ASCII %dx%d | %d fps%s%s%s%s\n",
device, cam.width, cam.height, ascii_w, ascii_h, fps,
opts.color ? " | color" : "", opts.edges ? " | edges" : "",
opts.dither ? " | dither" : "", opts.invert ? " | inverted" : "");
opts.color ? " | color" : "",
opts.edges ? " | edges" : "",
opts.dither ? " | dither" : "",
opts.invert ? " | inverted": "");
// Allocate pixel buffers
int cam_pixels = cam.width * cam.height;
@ -191,16 +195,27 @@ int main(int argc, char *argv[]) {
}
// Initial full clear
write(STDOUT_FILENO, "\033[2J\033[H\033[?25l", 11);
write(STDOUT_FILENO, "\033[2J\033[H\033[?25l", 13);
term_raw_mode();
// Main loop
struct timespec frame_start;
clock_gettime(CLOCK_MONOTONIC, &frame_start);
struct timespec last_frame_time = frame_start;
char input_char;
while (keep_running) {
clock_gettime(CLOCK_MONOTONIC, &frame_start);
long frame_diff_ns =
(frame_start.tv_sec - last_frame_time.tv_sec) * 1000000000L + // Seconds
(frame_start.tv_nsec - last_frame_time.tv_nsec); // Nano seconds
if (frame_diff_ns > 0)
fps_push(&fps_calc, frame_diff_ns);
last_frame_time = frame_start;
double current_fps = fps_get(&fps_calc);
// Check for 'q' key non-blocking
if (read(STDIN_FILENO, &input_char, 1) == 1) {
if (input_char == 'q' || input_char == 'Q') {
@ -222,9 +237,10 @@ int main(int argc, char *argv[]) {
int len = grayscale_to_ascii(gray, rgb, cam.width, cam.height, ascii_w,
ascii_h, out_buf, out_size, &opts);
if (len > 0) {
write(STDOUT_FILENO, "\033[H", 3);
write(STDOUT_FILENO, out_buf, (size_t)len);
overlay_fps_box(ascii_w, current_fps, opts.color);
}
if (webcam_requeue_buffer(&cam) < 0) {
@ -237,7 +253,7 @@ int main(int argc, char *argv[]) {
// Cleanup
term_restore();
write(STDOUT_FILENO, "\033[0m\033[?25h\n", 10);
write(STDOUT_FILENO, "\033[0m\033[?25h\n", 11);
fprintf(stderr, "Stopped.\n");
free(gray);