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avfilter/vf_drawbox: implement process_command

This commit is contained in:
Paul B Mahol 2019-10-01 20:17:50 +02:00
parent 027a53dc49
commit 1b2ed0c392
2 changed files with 56 additions and 0 deletions
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14
doc/filters.texi
View File

@ -8847,6 +8847,13 @@ drawbox=x=-t:y=0.5*(ih-iw/2.4)-t:w=iw+t*2:h=iw/2.4+t*2:t=2:c=red
@end example
@end itemize
@subsection Commands
This filter supports same commands as options.
The command accepts the same syntax of the corresponding option.
If the specified expression is not valid, it is kept at its current
value.
@section drawgrid
Draw a grid on the input image.
@ -8932,6 +8939,13 @@ drawgrid=w=iw/3:h=ih/3:t=2:c=white@@0.5
@end example
@end itemize
@subsection Commands
This filter supports same commands as options.
The command accepts the same syntax of the corresponding option.
If the specified expression is not valid, it is kept at its current
value.
@anchor{drawtext}
@section drawtext

42
libavfilter/vf_drawbox.c
View File

@ -273,6 +273,46 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
{
DrawBoxContext *s = ctx->priv;
int ret;
if ( !strcmp(cmd, "w") || !strcmp(cmd, "width")
|| !strcmp(cmd, "h") || !strcmp(cmd, "height")
|| !strcmp(cmd, "x") || !strcmp(cmd, "y")
|| !strcmp(cmd, "t") || !strcmp(cmd, "thickness")
|| !strcmp(cmd, "c") || !strcmp(cmd, "color")
|| !strcmp(cmd, "replace")) {
int old_x = s->x;
int old_y = s->y;
int old_w = s->w;
int old_h = s->h;
int old_t = s->thickness;
int old_r = s->replace;
AVFilterLink *inlink = ctx->inputs[0];
av_opt_set(s, cmd, args, 0);
init(ctx);
if ((ret = config_input(inlink)) < 0) {
s->x = old_x;
s->y = old_y;
s->w = old_w;
s->h = old_h;
s->thickness = old_t;
s->replace = old_r;
return ret;
}
} else {
ret = AVERROR(ENOSYS);
}
return ret;
}
#define OFFSET(x) offsetof(DrawBoxContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
@ -323,6 +363,7 @@ AVFilter ff_vf_drawbox = {
.query_formats = query_formats,
.inputs = drawbox_inputs,
.outputs = drawbox_outputs,
.process_command = process_command,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
#endif /* CONFIG_DRAWBOX_FILTER */
@ -457,6 +498,7 @@ AVFilter ff_vf_drawgrid = {
.inputs = drawgrid_inputs,
.outputs = drawgrid_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
.process_command = process_command,
};
#endif /* CONFIG_DRAWGRID_FILTER */