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avfilter/vf_datascope: let user change background opacity 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2016-09-09 00:40:30 +02:00
parent 037422178d
commit e9770b40b1
2 changed files with 7 additions and 3 deletions
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3
doc/filters.texi
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@ -6035,6 +6035,9 @@ the text color is picked in such way so its always visible.
@item axis
Draw rows and columns numbers on left and top of video.
@item opacity
Set background opacity.
@end table
@section dctdnoiz

7
libavfilter/vf_datascope.c
View File

@ -36,6 +36,7 @@ typedef struct DatascopeContext {
int x, y;
int mode;
int axis;
float opacity;
int nb_planes;
int nb_comps;
@ -62,6 +63,7 @@ static const AVOption datascope_options[] = {
{ "color", NULL, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode" },
{ "color2", NULL, 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "mode" },
{ "axis", "draw column/row numbers", OFFSET(axis), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ "opacity", "set background opacity", OFFSET(opacity), AV_OPT_TYPE_FLOAT, {.dbl=0.75}, 0, 1, FLAGS },
{ NULL }
};
@ -135,7 +137,6 @@ static void reverse_color(FFDrawContext *draw, FFDrawColor *color, FFDrawColor *
reverse->comp[p].u8[0] = color->comp[p].u8[0] > 127 ? 0 : 255;
reverse->comp[p].u8[1] = color->comp[p].u8[1] > 127 ? 0 : 255;
reverse->comp[p].u8[2] = color->comp[p].u8[2] > 127 ? 0 : 255;
reverse->comp[p].u8[3] = color->comp[p].u8[3] > 127 ? 0 : 255;
} else {
const unsigned max = (1 << draw->desc->comp[p].depth) - 1;
const unsigned mid = (max + 1) / 2;
@ -143,7 +144,6 @@ static void reverse_color(FFDrawContext *draw, FFDrawColor *color, FFDrawColor *
reverse->comp[p].u16[0] = color->comp[p].u16[0] > mid ? 0 : max;
reverse->comp[p].u16[1] = color->comp[p].u16[1] > mid ? 0 : max;
reverse->comp[p].u16[2] = color->comp[p].u16[2] > mid ? 0 : max;
reverse->comp[p].u16[3] = color->comp[p].u16[3] > mid ? 0 : max;
}
}
}
@ -337,11 +337,12 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
static int config_input(AVFilterLink *inlink)
{
DatascopeContext *s = inlink->dst->priv;
uint8_t alpha = s->opacity * 255;
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
ff_draw_init(&s->draw, inlink->format, 0);
ff_draw_color(&s->draw, &s->white, (uint8_t[]){ 255, 255, 255, 255} );
ff_draw_color(&s->draw, &s->black, (uint8_t[]){ 0, 0, 0, 0} );
ff_draw_color(&s->draw, &s->black, (uint8_t[]){ 0, 0, 0, alpha} );
ff_draw_color(&s->draw, &s->yellow, (uint8_t[]){ 255, 255, 0, 255} );
ff_draw_color(&s->draw, &s->gray, (uint8_t[]){ 77, 77, 77, 255} );
s->chars = (s->draw.desc->comp[0].depth + 7) / 8 * 2;