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vcap/testcard2: add noise option

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For testing - as testcard2 is being also used to measure latency, adding
a noise to increase complexity for compression.
This commit is contained in:
Martin Pulec
2025-09-16 16:05:36 +02:00
parent e63988478d
commit 3cc66760cf
1 changed files with 32 additions and 3 deletions
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35
src/video_capture/testcard2.c
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@@ -6,7 +6,7 @@
* Merge to mainline testcard.
*/
/*
* Copyright (c) 2011-2024 CESNET
* Copyright (c) 2011-2025 CESNET, zájmové sdružení právnických osob
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -91,9 +91,13 @@
#define BANNER_HEIGHT 150L
#define BANNER_MARGIN_BOTTOM 75L
#define BUFFER_SEC 1
#define DEFAULT_FORMAT "1920:1080:24:UYVY"
#define EPS_PLUS_1 1.0001
#define FONT_HEIGHT 108
enum {
NOISE_DEFAULT = 30,
};
#define DEFAULT_FORMAT "1920:1080:24:UYVY"
#define MOD_NAME "[testcard2] "
#ifdef HAVE_SDL3
@@ -109,6 +113,7 @@ struct testcard_state2 {
int count;
unsigned char *bg; ///< bars converted to dest color_spec
unsigned noise; ///< add noise if >0; the magnitude is distance
struct timeval t0;
struct video_desc desc;
char *data;
@@ -199,10 +204,13 @@ static int vidcap_testcard2_init(struct vidcap_params *params, void **state)
color_printf("testcard2 is an alternative implementation of testing signal source.\n");
color_printf("It is less maintained than mainline testcard and has less features but has some extra ones, i. a. a timer (if SDL(2)_ttf is found.\n");
color_printf("\n");
color_printf("testcard2 options:\n");
color_printf("testcard2 usage:\n");
color_printf(TBOLD(TRED("\t-t testcard2") "[:<width>:<height>:<fps>:<codec>]") "\n");
color_printf("or\n");
color_printf(TBOLD(TRED("\t-t testcard2") "[:size=<width>x<height>][:fps=<fps>][:codec=<codec>][:mode=<mode>]") "\n");
printf("\nOptions:\n");
color_printf("\t" TBOLD("noise[=<val>]") " - add noise to the image\n");
printf("\n");
testcard_show_codec_help("testcard2", true);
return VIDCAP_INIT_NOERR;
@@ -260,6 +268,10 @@ static int vidcap_testcard2_init(struct vidcap_params *params, void **state)
ret = false;
break;
}
} else if (IS_PREFIX(tmp, "noise") || IS_KEY_PREFIX(tmp, "noise")) {
s->noise = IS_KEY_PREFIX(tmp, "noise")
? atoi(strchr(tmp, '=') + 1)
: NOISE_DEFAULT;
} else {
fprintf(stderr, "[testcard2] Unknown option: %s\n", tmp);
ret = false;
@@ -372,6 +384,22 @@ static void vidcap_testcard2_done(void *state)
free(s);
}
static void
add_noise(unsigned char *data, size_t len, unsigned bpp, unsigned noisiness)
{
if (noisiness == 0) {
return;
}
unsigned char *end = data + len;
data += bpp * (rand() % noisiness);
while (data < end) {
for (unsigned i = 0; i < bpp; ++i) {
data[i] = rand() % 256;
}
data += bpp * (1 + (rand() % noisiness));
}
}
/**
* Only text banner is rendered in RGBA, other elements (background, squares) are already
* converted to destination color space. Keep in mind that the regions should be aligned
@@ -506,6 +534,7 @@ void * vidcap_testcard2_thread(void *arg)
d++;
}
}
add_noise(tmp, data_len, get_bpp(s->desc.color_spec), s->noise);
testcard_convert_buffer(RGBA, s->desc.color_spec, tmp + (s->desc.height - BANNER_MARGIN_BOTTOM - BANNER_HEIGHT) * vc_get_linesize(s->desc.width, s->desc.color_spec), (unsigned char *) banner, s->desc.width, BANNER_HEIGHT);
#ifdef HAVE_SDL3
SDL_DestroySurface(text);