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NX2navi/tests/flight_flash_check.c
chrg6 202fd47ceb Let the flight recorder dump on its own when one frame flashes. 
With flight = 1 and its thumbnails kept, the recorder now also writes a dump when a frame's picture differs strongly from the frame before and the frame after while those two agree, which is what a one-frame flicker looks like. Each thumbnail is reduced to 16x9 cells of mean brightness where the present thread already sees it complete, and a frame is a flash when at least three cells are more than 24 of 255 brighter or darker than in both neighbours, the neighbours being alike in those cells, around them and over the picture as a whole. A camera cut, a fade, a pan and shapes crossing the picture are no flash, and a frame beside one without a thumbnail is not judged. The dump is the one F8 writes, named "flash" with the frame's number in its header line, at most one every 30 seconds. flight_flash = 0 turns it off; flight_flash_diff and flight_flash_cells set the two thresholds.

On the thumbnails of earlier dumps the defaults flag the frames whose scene was white once and nothing in the runs without that fault. tests/flight_flash_check.py checks the test itself on drawn pictures.

Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>
2026-11-12 15:16:30 -05:00

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// runtime/flight_flash.h: the flight recorder's flash trigger, which frames count as a one-frame flash. Pictures of the
// thumbnails' size are drawn here, turned into cell means (flash_cells) and judged three at a time (flash_test), or
// handed in frame by frame as the present thread does (flash_note). Built and run by tests/flight_flash_check.py;
// prints each failed check and exits 1 on any. With the argument "time" it also prints what one flash_cells and one
// flash_test cost.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "flight_flash.h"
#define W 640 // FLIGHT_THUMB_W x FLIGHT_THUMB_H (flight.h): cells of 40x40 pixels
#define H 360
#define DIFF 24 // the defaults of NX2NAVI_FLIGHT_FLASH_DIFF and NX2NAVI_FLIGHT_FLASH_CELLS (cfg.c)
#define MIN_CELLS 3
static int fails;
#define CHECK(c, ...) do { if (!(c)) { fails++; printf("FAIL line %d: ", __LINE__); printf(__VA_ARGS__); printf("\n"); } } while (0)
typedef struct { uint8_t px[W * H * 4]; } Pic;
typedef struct { uint8_t c[FLASH_CELLS]; } Cells;
// A rectangle of one grey level (clipped to the picture).
static void fill(Pic *p, int x0, int y0, int x1, int y1, int v) {
for (int y = y0 < 0 ? 0 : y0; y < y1 && y < H; y++)
for (int x = x0 < 0 ? 0 : x0; x < x1 && x < W; x++) {
uint8_t *q = &p->px[4 * (y * W + x)];
q[0] = q[1] = q[2] = (uint8_t)v, q[3] = 255;
}
}
// A scene with something in every cell: bands of brightness that differ from cell to cell, shifted by (dx, dy) pixels.
static void scene(Pic *p, int dx, int dy) {
for (int y = 0; y < H; y++)
for (int x = 0; x < W; x++) {
int u = x + dx, v = y + dy;
int g = 60 + ((u / 40 * 37 + v / 40 * 91) % 7) * 20 + ((u / 5 + v / 5) & 1) * 10;
uint8_t *q = &p->px[4 * (y * W + x)];
q[0] = q[1] = q[2] = (uint8_t)g, q[3] = 255;
}
}
static Cells cells_of(const Pic *p) {
Cells c;
flash_cells(p->px, W, H, c.c);
return c;
}
static int test3(const Pic *a, const Pic *b, const Pic *c) {
Cells ca = cells_of(a), cb = cells_of(b), cc = cells_of(c);
return flash_test(ca.c, cb.c, cc.c, DIFF, MIN_CELLS);
}
static Pic A, B, C;
int main(int argc, char **argv) {
// ---- flash_cells: the cells are where they should be, and the byte order does not matter
memset(&A, 0, sizeof A);
fill(&A, 0, 0, W, H, 40);
fill(&A, 80, 40, 160, 120, 200); // cells (2..3, 1..2) whole
fill(&A, 600, 320, 640, 360, 120); // the last cell
Cells ca = cells_of(&A);
int wrong = 0;
for (int y = 0; y < FLASH_CELLS_Y; y++)
for (int x = 0; x < FLASH_CELLS_X; x++) {
int want = x >= 2 && x <= 3 && y >= 1 && y <= 2 ? 200 : x == 15 && y == 8 ? 120 : 40;
wrong += ca.c[y * FLASH_CELLS_X + x] != want;
}
CHECK(!wrong, "%d cells do not hold their rectangle's level", wrong);
for (int i = 0; i < W * H; i++) A.px[4 * i] = 255, A.px[4 * i + 2] = 0; // first byte full, third none
Cells rb = cells_of(&A);
for (int i = 0; i < W * H; i++) A.px[4 * i] = 0, A.px[4 * i + 2] = 255; // the same picture in the other order
Cells br = cells_of(&A);
CHECK(!memcmp(rb.c, br.c, FLASH_CELLS), "the means differ with the order of the first and the third byte");
// ---- a flash: one frame with a bright patch over a steady scene, the frames around it alike
scene(&A, 0, 0);
B = A;
fill(&B, 200, 120, 320, 200, 255); // 3x2 cells turn white for the frame
int n = test3(&A, &B, &A);
CHECK(n == 6, "a white patch of 6 cells for one frame counts %d cells", n);
fill(&B, 200, 120, 320, 200, 0);
n = test3(&A, &B, &A);
CHECK(n == 6, "a black patch of 6 cells for one frame counts %d cells", n);
fill(&B, 0, 0, W, H, 255);
n = test3(&A, &B, &A);
CHECK(n == FLASH_CELLS, "a white frame counts %d cells", n);
// ... and with a little change between the neighbours, as a scene with slow motion has
scene(&C, 1, 0);
B = A;
fill(&B, 200, 120, 320, 200, 255);
n = test3(&A, &B, &C);
CHECK(n == 6, "the patch between two frames a pixel apart counts %d cells", n);
// ---- no flash: too small, too weak, or not there for one frame only
B = A;
fill(&B, 200, 120, 280, 160, 255); // 2 cells
CHECK(!test3(&A, &B, &A), "a patch of 2 cells is a flash with %d as the least", MIN_CELLS);
Cells flat, mid;
memset(flat.c, 100, FLASH_CELLS);
mid = flat;
for (int i = 0; i < 5; i++) mid.c[40 + i] = 100 + DIFF; // differs by the threshold itself, not by more
CHECK(!flash_test(flat.c, mid.c, flat.c, DIFF, MIN_CELLS), "cells that differ by the threshold count");
for (int i = 0; i < 5; i++) mid.c[40 + i] = 100 + DIFF + 1;
CHECK(flash_test(flat.c, mid.c, flat.c, DIFF, MIN_CELLS) == 5, "cells one past the threshold do not count");
B = A;
fill(&B, 200, 120, 320, 200, 255);
CHECK(!test3(&A, &B, &B), "a patch that stays is a flash"); // appears and stays
CHECK(!test3(&B, &B, &A), "a patch that goes is a flash"); // was there and goes
CHECK(!test3(&A, &A, &A), "three frames alike are a flash");
// ---- a camera cut: two different scenes, the cut before the frame or after it
scene(&C, 333, 222);
for (int i = 0; i < W * H * 4; i++) C.px[i] = (uint8_t)(255 - C.px[i]);
CHECK(!test3(&A, &C, &C), "a cut before the frame is a flash");
CHECK(!test3(&A, &A, &C), "a cut after the frame is a flash");
// three unrelated pictures (a cut on both sides, a fast turn): the neighbours disagree, nothing is judged
scene(&B, 77, 140);
CHECK(!test3(&A, &B, &C), "three unrelated pictures are a flash");
// a fade: every cell between its neighbours
fill(&A, 0, 0, W, H, 200), fill(&B, 0, 0, W, H, 120), fill(&C, 0, 0, W, H, 40);
CHECK(!test3(&A, &B, &C), "a fade is a flash");
// ---- steady motion
// the whole scene pans, slowly and fast
for (int v = 1; v <= 64; v *= 2) {
scene(&A, 0, 0), scene(&B, v, 0), scene(&C, 2 * v, 0);
n = test3(&A, &B, &C);
CHECK(!n, "a pan of %d pixels a frame is a flash of %d cells", v, n);
scene(&B, v, v), scene(&C, 2 * v, 2 * v);
n = test3(&A, &B, &C);
CHECK(!n, "a diagonal pan of %d pixels a frame is a flash of %d cells", v, n);
}
// A bright bar as wide as a cell and five cells high crosses a flat picture. In the frame in which it fills its
// cells, they are brighter than in the frame before and the frame after, which are alike there: only the cells
// beside them, which the bar leaves and enters, tell this from a flash. Every speed and every phase.
int hits = 0;
for (int v = 1; v <= 80; v++)
for (int x = 160; x < 160 + 40; x++) {
for (int k = 0; k < 3; k++) {
Pic *p = k == 0 ? &A : k == 1 ? &B : &C;
fill(p, 0, 0, W, H, 50);
fill(p, x + (k - 1) * v, 80, x + (k - 1) * v + 40, 280, 230);
}
hits += test3(&A, &B, &C) != 0;
}
CHECK(!hits, "a bar crossing the picture is a flash at %d of 3200 speeds and places", hits);
// ... and the same bar moving down
hits = 0;
for (int v = 1; v <= 60; v++)
for (int y = 120; y < 120 + 40; y++) {
for (int k = 0; k < 3; k++) {
Pic *p = k == 0 ? &A : k == 1 ? &B : &C;
fill(p, 0, 0, W, H, 50);
fill(p, 120, y + (k - 1) * v, 440, y + (k - 1) * v + 40, 230);
}
hits += test3(&A, &B, &C) != 0;
}
CHECK(!hits, "a bar moving down the picture is a flash at %d of 2400 speeds and places", hits);
// the bar where it stands for one frame only is a flash: nothing beside it changed
fill(&A, 0, 0, W, H, 50);
B = A;
fill(&B, 160, 80, 200, 280, 230);
n = test3(&A, &B, &A);
CHECK(n == 5, "the bar shown for one frame counts %d cells", n);
// Three squares as large as a cell move diagonally. What leaves a square's cell is shared between three cells
// beside it, so none of those changes by as much as a flash does: only the cells around a cell that are compared
// with what that cell differs by tell these from three cells that flash.
hits = 0;
for (int v = 1; v < 40; v++)
for (int ph = 0; ph < 40; ph++) {
for (int k = 0; k < 3; k++) {
Pic *p = k == 0 ? &A : k == 1 ? &B : &C;
int o = ph + (k - 1) * v;
fill(p, 0, 0, W, H, 50);
fill(p, 120 + o, 80 + o, 160 + o, 120 + o, 230);
fill(p, 280 + o, 160 + o, 320 + o, 200 + o, 230);
fill(p, 440 + o, 240 + o, 480 + o, 280 + o, 230);
}
hits += test3(&A, &B, &C) != 0;
}
CHECK(!hits, "three squares moving diagonally are a flash at %d of 1560 speeds and places", hits);
// ---- the rules cell by cell: a row of three cells 60 brighter for one frame, and what the neighbours do around it
Cells p0, c0, n0;
memset(p0.c, 100, FLASH_CELLS);
c0 = n0 = p0;
for (int i = 0; i < 3; i++) c0.c[4 * FLASH_CELLS_X + 5 + i] = 160;
CHECK(flash_test(p0.c, c0.c, n0.c, DIFF, MIN_CELLS) == 3, "three cells 60 brighter for one frame are no flash");
n0.c[3 * FLASH_CELLS_X + 4] = 115; // diagonally beside the first cell: 15 apart, a quarter of 60
CHECK(flash_test(p0.c, c0.c, n0.c, DIFF, MIN_CELLS) == 3, "a cell beside 15 apart, a quarter of the flash, hides it");
n0.c[3 * FLASH_CELLS_X + 4] = 116; // one more: the first cell no longer counts, and two are too few
CHECK(!flash_test(p0.c, c0.c, n0.c, DIFF, MIN_CELLS), "a cell beside 16 apart does not hide a flash of 60");
CHECK(flash_test(p0.c, c0.c, n0.c, DIFF, 2) == 2, "the two cells further from it do not count");
n0 = p0;
n0.c[8 * FLASH_CELLS_X + 15] = 100 + DIFF; // far from the flash, as far apart as allowed
CHECK(flash_test(p0.c, c0.c, n0.c, DIFF, MIN_CELLS) == 3, "a far cell %d apart keeps the frame from being judged", DIFF);
n0.c[8 * FLASH_CELLS_X + 15] = 100 + DIFF + 1; // further than a flash must differ by: not judged
CHECK(!flash_test(p0.c, c0.c, n0.c, DIFF, MIN_CELLS), "a far cell %d apart does not", DIFF + 1);
// the neighbours a little apart (more than a quarter of the threshold) in the lower rows: FLASH_MOVING cells
// leave the frame judged, one more does not
n0 = p0;
for (int i = 0; i < FLASH_MOVING; i++) n0.c[6 * FLASH_CELLS_X + i] = 100 + DIFF / 4 + 1;
CHECK(flash_test(p0.c, c0.c, n0.c, DIFF, MIN_CELLS) == 3, "%d cells a little apart keep the frame from being judged", FLASH_MOVING);
n0.c[6 * FLASH_CELLS_X + FLASH_MOVING] = 100 + DIFF / 4 + 1;
CHECK(!flash_test(p0.c, c0.c, n0.c, DIFF, MIN_CELLS), "%d cells a little apart do not", FLASH_MOVING + 1);
// darker than one neighbour and brighter than the other is no flash, however the thresholds are set
for (int i = 0; i < FLASH_CELLS; i++) p0.c[i] = 40, c0.c[i] = 100, n0.c[i] = 160;
CHECK(!flash_test(p0.c, c0.c, n0.c, 4, 1) && !flash_test(n0.c, c0.c, p0.c, 4, 1), "a frame between its neighbours is a flash");
// ---- frame by frame, with thumbnails missing
scene(&A, 0, 0);
B = A;
fill(&B, 200, 120, 320, 200, 255);
Cells steady = cells_of(&A), flash = cells_of(&B);
static FlashTrack t;
int r[40] = {0};
// frames 1..9 steady, 5 the flash: found when 6 arrives, as frame 5
for (uint64_t f = 1; f <= 9; f++) r[f] = flash_note(&t, f, f == 5 ? flash.c : steady.c, DIFF, MIN_CELLS);
wrong = 0;
for (int f = 1; f <= 9; f++) wrong += (r[f] != 0) != (f == 6);
CHECK(!wrong && r[6] == 6, "a flash at frame 5 is reported at %d other frames, with %d cells at frame 6", wrong, r[6]);
// the flash at 12, the frame after it without a thumbnail: not judged, at 13 (missing), 14 or later
wrong = 0;
for (uint64_t f = 10; f <= 18; f++)
if (f != 13) wrong += flash_note(&t, f, f == 12 ? flash.c : steady.c, DIFF, MIN_CELLS) != 0;
CHECK(!wrong, "a flash whose next frame has no thumbnail is reported %d times", wrong);
// the frame before the flash without a thumbnail
wrong = 0;
for (uint64_t f = 20; f <= 28; f++)
if (f != 22) wrong += flash_note(&t, f, f == 23 ? flash.c : steady.c, DIFF, MIN_CELLS) != 0;
CHECK(!wrong, "a flash whose frame before has no thumbnail is reported %d times", wrong);
// the flash frame itself without a thumbnail, and its neighbours four frames apart from older ones in the slots
wrong = 0;
for (uint64_t f = 30; f <= 38; f++)
if (f != 33) wrong += flash_note(&t, f, steady.c, DIFF, MIN_CELLS) != 0;
CHECK(!wrong, "steady frames with one missing are reported %d times", wrong);
// only every other frame has a thumbnail, and they alternate: no three in a row, nothing judged
wrong = 0;
for (uint64_t f = 40; f <= 60; f += 2) wrong += flash_note(&t, f, f % 4 ? flash.c : steady.c, DIFF, MIN_CELLS) != 0;
CHECK(!wrong, "frames two apart are judged %d times", wrong);
// the first frames of a run, and frame 0, which names no frame
memset(&t, 0, sizeof t);
CHECK(!flash_note(&t, 0, flash.c, DIFF, MIN_CELLS) && !flash_note(&t, 1, steady.c, DIFF, MIN_CELLS) &&
!flash_note(&t, 2, flash.c, DIFF, MIN_CELLS),
"the first two frames are judged");
CHECK(flash_note(&t, 3, steady.c, DIFF, MIN_CELLS) == 6, "a flash at frame 2 is not found at frame 3");
if (argc > 1 && !strcmp(argv[1], "time")) {
enum { N = 2000 };
scene(&A, 0, 0);
unsigned sum = 0;
clock_t t0 = clock();
for (int i = 0; i < N; i++) {
A.px[(i * 4099) % (W * H * 4)] ^= 1; // a picture the compiler cannot take as known
Cells c = cells_of(&A);
sum += c.c[i % FLASH_CELLS];
}
clock_t t1 = clock();
for (int i = 0; i < N * 100; i++) {
flash.c[i % FLASH_CELLS] ^= 1;
sum += (unsigned)flash_test(steady.c, flash.c, steady.c, DIFF, MIN_CELLS);
}
clock_t t2 = clock();
printf("flight_flash_check: flash_cells %.1f us a picture, flash_test %.2f us a frame (sum %u)\n",
(double)(t1 - t0) * 1e6 / CLOCKS_PER_SEC / N, (double)(t2 - t1) * 1e6 / CLOCKS_PER_SEC / (N * 100), sum);
}
printf(fails ? "flight_flash_check: %d failed\n" : "flight_flash_check: ok\n", fails);
return fails != 0;
}
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