[FFmpeg-cvslog] avfilter/vf_pseudocolor: add presets
Paul B Mahol
git at videolan.org
Thu Jan 28 21:08:22 EET 2021
ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Thu Jan 28 15:13:58 2021 +0100| [d01aa49753ba02d45f635a3dd66ea5df5de0393e] | committer: Paul B Mahol
avfilter/vf_pseudocolor: add presets
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d01aa49753ba02d45f635a3dd66ea5df5de0393e
---
doc/filters.texi | 14 ++++++
libavfilter/vf_pseudocolor.c | 109 ++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 121 insertions(+), 2 deletions(-)
diff --git a/doc/filters.texi b/doc/filters.texi
index fb9995eddf..8ce5a82f39 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -16208,6 +16208,20 @@ set pixel fourth component expression, corresponds to the alpha component
@item i
set component to use as base for altering colors
+
+ at item p
+Pick one of built-in LUTs. By default is set to none.
+
+Available LUTs:
+ at table @samp
+ at item magma
+ at item inferno
+ at item plasma
+ at item viridis
+ at item turbo
+ at item cividis
+ at end table
+
@end table
Each of them specifies the expression to use for computing the lookup table for
diff --git a/libavfilter/vf_pseudocolor.c b/libavfilter/vf_pseudocolor.c
index 4c24f49bd9..2cba46e3da 100644
--- a/libavfilter/vf_pseudocolor.c
+++ b/libavfilter/vf_pseudocolor.c
@@ -59,8 +59,53 @@ enum var_name {
VAR_VARS_NB
};
+enum ColorMaps {
+ MAGMA,
+ INFERNO,
+ PLASMA,
+ VIRIDIS,
+ TURBO,
+ CIVIDIS,
+ NB_CMAPS,
+};
+
+static const double presets[][3][8] =
+{
+ [MAGMA] = {
+ {-7.5631093e-16, 7.4289183e-13, -2.8525484e-10, 5.4446085e-08, -5.5596238e-06, 3.0569325e-04, -2.3137421e-03, 1.2152095e-02 },
+ { 1.3217636e-15, -1.2214648e-12, 4.4319712e-10, -8.0197993e-08, 7.6598370e-06, -3.6523704e-04, 8.4836670e-03, -2.5536888e-02 },
+ {-1.1446568e-15, 1.0013446e-12, -3.5651575e-10, 6.6775016e-08, -6.7120346e-06, 2.7346619e-04, 4.7969657e-03, 1.1971441e-02 },
+ },
+ [INFERNO] = {
+ {-3.9848859e-18, 9.4821649e-14, -6.7371977e-11, 1.8469937e-08, -2.5359307e-06, 1.7959053e-04, 3.9782564e-04, 2.8845935e-04 },
+ { 6.8408539e-16, -6.5499979e-13, 2.4562526e-10, -4.5989298e-08, 4.5723324e-06, -2.2111913e-04, 5.2023164e-03, -1.1226064e-02 },
+ {-2.9921470e-15, 2.5864165e-12, -8.7403799e-10, 1.4713388e-07, -1.2701505e-05, 4.5159935e-04, 3.1087989e-03, 1.9122831e-02 },
+ },
+ [PLASMA] = {
+ { 3.6196089e-16, -3.3623041e-13, 1.2324010e-10, -2.2769060e-08, 2.2297792e-06, -1.2567829e-04, 9.9791629e-03, 5.7247918e-02 },
+ { 5.0262888e-16, -5.3193896e-13, 2.2451715e-10, -4.7529623e-08, 5.1374873e-06, -2.3260136e-04, 3.1502825e-03, 1.5362491e-02 },
+ {-1.7782261e-16, 2.2487839e-13, -1.0610236e-10, 2.4112644e-08, -2.6331623e-06, 8.9499751e-05, 2.1386328e-03, 5.3824268e-01 },
+ },
+ [VIRIDIS] = {
+ { 9.4850045e-16, -8.6629383e-13, 3.0310944e-10, -5.1340396e-08, 4.6024275e-06, -2.2744239e-04, 4.5559993e-03, 2.5662350e-01 },
+ { 9.6461041e-17, -6.9209477e-14, 1.7625397e-11, -2.0229773e-09, 1.4900110e-07, -1.9315187e-05, 5.8967339e-03, 3.9544827e-03 },
+ { 5.1785449e-16, -3.6663004e-13, 1.0249990e-10, -1.5431998e-08, 1.5007941e-06, -1.2001502e-04, 7.6951526e-03, 3.2292815e-01 },
+ },
+ [TURBO] = {
+ {-4.3683890e-15, 3.7020347e-12, -1.1712592e-09, 1.6401790e-07, -8.6842919e-06, -1.8542465e-06, 8.4485325e-03, 1.6267077e-01 },
+ {-4.0011069e-16, 2.7861423e-13, -6.3388921e-11, 5.8872238e-09, -5.4466522e-07, 1.8037114e-05, 1.0599869e-02, 7.6914696e-02 },
+ {-2.8242609e-15, 2.9234108e-12, -1.1726546e-09, 2.2552115e-07, -2.0059387e-05, 5.0595552e-04, 1.7714932e-02, 2.7271836e-01 },
+ },
+ [CIVIDIS] = {
+ {-9.5484131e-16, 9.6988184e-13, -4.0058766e-10, 8.5743924e-08, -9.9644797e-06, 5.9197908e-04, -1.0361579e-02, 3.3164429e-02 },
+ { 1.2731941e-17, -9.4238449e-15, 2.2808841e-12, -1.1548296e-10, -2.3888913e-08, 3.8986680e-06, 2.5879330e-03, 1.2769733e-01 },
+ { 4.6004608e-16, -5.0686849e-13, 2.2753449e-10, -5.3074099e-08, 6.7196096e-06, -4.4120020e-04, 1.3435551e-02, 2.8293355e-01 },
+ },
+};
+
typedef struct PseudoColorContext {
const AVClass *class;
+ int preset;
int max;
int index;
int nb_planes;
@@ -90,6 +135,14 @@ static const AVOption pseudocolor_options[] = {
{ "c2", "set component #2 expression", OFFSET(comp_expr_str[2]), AV_OPT_TYPE_STRING, {.str="val"}, .flags = FLAGS },
{ "c3", "set component #3 expression", OFFSET(comp_expr_str[3]), AV_OPT_TYPE_STRING, {.str="val"}, .flags = FLAGS },
{ "i", "set component as base", OFFSET(index), AV_OPT_TYPE_INT, {.i64=0}, 0, 3, .flags = FLAGS },
+ { "p", "set preset", OFFSET(preset), AV_OPT_TYPE_INT, {.i64=-1},-1,NB_CMAPS-1, .flags = FLAGS, "preset" },
+ { "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64=-1},.flags = FLAGS, "preset" },
+ { "magma", NULL, 0, AV_OPT_TYPE_CONST, {.i64=MAGMA}, .flags = FLAGS, "preset" },
+ { "inferno", NULL, 0, AV_OPT_TYPE_CONST, {.i64=INFERNO}, .flags = FLAGS, "preset" },
+ { "plasma", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PLASMA}, .flags = FLAGS, "preset" },
+ { "viridis", NULL, 0, AV_OPT_TYPE_CONST, {.i64=VIRIDIS}, .flags = FLAGS, "preset" },
+ { "turbo", NULL, 0, AV_OPT_TYPE_CONST, {.i64=TURBO}, .flags = FLAGS, "preset" },
+ { "cividis", NULL, 0, AV_OPT_TYPE_CONST, {.i64=CIVIDIS}, .flags = FLAGS, "preset" },
{ NULL }
};
@@ -419,14 +472,39 @@ static void pseudocolor_filter_16_11d(int max, int width, int height,
}
}
+#define RGB_TO_Y_BT709(r, g, b) \
+((0.21260*219.0/255.0) * (r) + (0.71520*219.0/255.0) * (g) + \
+ (0.07220*219.0/255.0) * (b))
+
+#define RGB_TO_U_BT709(r1, g1, b1, max) \
+(-(0.11457*224.0/255.0) * r1 - (0.38543*224.0/255.0) * g1 + \
+ (0.50000*224.0/255.0) * b1 + max * 0.5)
+
+#define RGB_TO_V_BT709(r1, g1, b1, max) \
+((0.50000*224.0/255.0) * r1 - (0.45415*224.0/255.0) * g1 - \
+ (0.04585*224.0/255.0) * b1 + max * 0.5)
+
+static double poly_eval(const double *const poly, double x)
+{
+ double res = 0.;
+
+ for (int i = 0; i < 8; i++) {
+ res += pow(x, i) * poly[7-i];
+ }
+
+ return av_clipd(res, 0., 1.);
+}
+
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
PseudoColorContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
- int depth, ret, hsub, vsub, color;
+ int depth, ret, hsub, vsub, color, factor, rgb;
+ rgb = desc->flags & AV_PIX_FMT_FLAG_RGB;
depth = desc->comp[0].depth;
+ factor = 1 << (depth - 8);
s->max = (1 << depth) - 1;
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
@@ -457,7 +535,7 @@ static int config_input(AVFilterLink *inlink)
s->var_values[VAR_VMAX] = 240 * (1 << (depth - 8));
s->var_values[VAR_AMAX] = s->max;
- for (color = 0; color < s->nb_planes; color++) {
+ for (color = 0; color < s->nb_planes && s->preset < 0; color++) {
double res;
int val;
@@ -488,6 +566,33 @@ static int config_input(AVFilterLink *inlink)
}
}
+ if (s->preset >= 0) {
+ for (int i = 0; i < 256; i++) {
+ for (int j = 0; j < factor; j++) {
+ const double lf = j / (double)factor;
+ double r, g, b;
+
+ g = poly_eval(presets[s->preset][1], i + lf) * s->max;
+ b = poly_eval(presets[s->preset][2], i + lf) * s->max;
+ r = poly_eval(presets[s->preset][0], i + lf) * s->max;
+
+ if (!rgb) {
+ 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);
+
+ r = v;
+ g = y;
+ b = u;
+ }
+
+ s->lut[0][i*factor+j] = g;
+ s->lut[1][i*factor+j] = b;
+ s->lut[2][i*factor+j] = r;
+ }
+ }
+ }
+
switch (inlink->format) {
case AV_PIX_FMT_YUV444P:
case AV_PIX_FMT_YUVA444P:
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