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avfilter/vf_pseudocolor: add cool preset

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This commit is contained in:
Paul B Mahol 2023-07-19 22:48:54 +02:00
parent 61e5ca4ded
commit 5d8879208c
2 changed files with 55 additions and 4 deletions
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1
doc/filters.texi
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@ -19706,6 +19706,7 @@ Available LUTs:
@item preferred
@item total
@item spectral
@item cool
@end table
@item opacity

58
libavfilter/vf_pseudocolor.c
View File

@ -68,6 +68,7 @@ enum Curves {
CIVIDIS,
SOLAR,
SPECTRAL,
COOL,
NB_CURVES,
};
@ -87,6 +88,7 @@ enum Presets {
PRESET_PREFERRED,
PRESET_TOTAL,
PRESET_SPECTRAL,
PRESET_COOL,
NB_PRESETS,
};
@ -96,6 +98,7 @@ typedef struct Curve {
double coef[3][8];
double offset[3];
curve_fun fun[3];
int yuv;
} Curve;
typedef struct Fill {
@ -137,6 +140,16 @@ static double solarfun(double x)
return 0.5 * sin(x) + 0.5;
}
static double coolfunu(double x)
{
return 0.25 * sin(2.0 * x * M_PI - M_PI) + 0.5;
}
static double coolfunv(double x)
{
return 0.25 * sin(2.0 * x * M_PI) + 0.5;
}
static const Curve curves[] =
{
[MAGMA] = {{
@ -181,6 +194,14 @@ static const Curve curves[] =
{ 1.2526e-15, -1.2203e-12, 4.7013e-10, -8.9360e-08, 8.3839e-06, -3.6642e-04, 1.4784e-02, -9.8075e-03 },
{ 1.4755e-15, -1.6765e-12, 7.3188e-10, -1.5522e-07, 1.6406e-05, -7.7883e-04, 1.4502e-02, 2.1597e-01 },
}, .fun = { limit, limit, limit }, },
[COOL] = {{
{ 0, 0, 0, 0, 0, 0, 1./256, 0 },
{ 0, 0, 0, 0, 0, 0, 1./256, 0 },
{ 0, 0, 0, 0, 0, 0, 1./256, 0 },
},
.offset = { 0., 0., 0 },
.yuv = 1,
.fun = { coolfunu, limit, coolfunv }, },
};
static const Preset presets[] =
@ -200,6 +221,7 @@ static const Preset presets[] =
[PRESET_HIGHLIGHTS] = { 3, highlights_range, NULL, highlights_fills },
[PRESET_SOLAR] = { 1, &full_range, &curves[SOLAR], NULL },
[PRESET_SPECTRAL]= { 1, &full_range, &curves[SPECTRAL],NULL },
[PRESET_COOL] = { 1, &full_range, &curves[COOL], NULL },
};
typedef struct PseudoColorContext {
@ -255,6 +277,7 @@ static const AVOption pseudocolor_options[] = {
{ "preferred", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_PREFERRED},.flags=FLAGS,"preset" },
{ "total", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_TOTAL}, .flags=FLAGS, "preset" },
{ "spectral", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_SPECTRAL},.flags = FLAGS, "preset" },
{ "cool", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_COOL}, .flags = FLAGS, "preset" },
{ "opacity", "set pseudocolor opacity",OFFSET(opacity), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 1, .flags = FLAGS },
{ NULL }
};
@ -571,6 +594,19 @@ static void pseudocolor_filter_16_11d(int max, int width, int height,
((0.50000*224.0/255.0) * r1 - (0.45415*224.0/255.0) * g1 - \
(0.04585*224.0/255.0) * b1 + max * 0.5)
#define Wr 0.2126
#define Wb 0.0722
#define Wg (1 - Wr - Wb)
#define Umax 0.436
#define Vmax 0.615
#define YUV_BT709_TO_R(y, u, v, max) \
((y + v * (1 - Wr) / Vmax) * max)
#define YUV_BT709_TO_G(y, u, v, max) \
((y - (u * Wb * (1 - Wb) / (Umax * Wg)) - (v * Wr * (1 - Wr) / (Vmax * Wg))) * max)
#define YUV_BT709_TO_B(y, u, v, max) \
((y + u * (1 - Wb) / Umax) * max)
static double poly_eval(const double *const poly, double x, curve_fun fun)
{
double res = 0.;
@ -696,11 +732,17 @@ static int config_input(AVFilterLink *inlink)
const double lf = i / (double)s->max * 256.;
double r, g, b;
g = poly_eval(curve.coef[1], lf + curve.offset[1], curve.fun[1]) * s->max;
b = poly_eval(curve.coef[2], lf + curve.offset[2], curve.fun[2]) * s->max;
r = poly_eval(curve.coef[0], lf + curve.offset[0], curve.fun[0]) * s->max;
g = poly_eval(curve.coef[1], lf + curve.offset[1], curve.fun[1]);
b = poly_eval(curve.coef[2], lf + curve.offset[2], curve.fun[2]);
r = poly_eval(curve.coef[0], lf + curve.offset[0], curve.fun[0]);
if (!rgb) {
if (!curve.yuv || !rgb) {
g *= s->max;
b *= s->max;
r *= s->max;
}
if (!rgb && !curve.yuv) {
double y = RGB_TO_Y_BT709(r, g, b);
double u = RGB_TO_U_BT709(r, g, b, s->max);
double v = RGB_TO_V_BT709(r, g, b, s->max);
@ -708,6 +750,14 @@ static int config_input(AVFilterLink *inlink)
r = v;
g = y;
b = u;
} else if (rgb && curve.yuv) {
double y = g;
double u = b - 0.5;
double v = r - 0.5;
r = av_clipd(YUV_BT709_TO_R(y, u, v, s->max), 0, s->max);
g = av_clipd(YUV_BT709_TO_G(y, u, v, s->max), 0, s->max);
b = av_clipd(YUV_BT709_TO_B(y, u, v, s->max), 0, s->max);
}
s->lut[0][i] = g;