lavfi/subtitles: switch to an AVOptions-based system.

doc/filters.texi

@@ -5322,8 +5322,7 @@ To enable compilation of this filter you need to configure FFmpeg with
 libavformat to convert the passed subtitles file to ASS (Advanced Substation
 Alpha) subtitles format.
 
-This filter accepts the following named options, expressed as a
-sequence of @var{key}=@var{value} pairs, separated by ":".
+The filter accepts the following options:
 
 @table @option
 @item filename, f

libavfilter/avfilter.c

@@ -657,6 +657,7 @@ int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque
     int ret=0;
     int anton_options =
         !strcmp(filter->filter->name,  "aformat") ||
+        !strcmp(filter->filter->name,  "ass")     ||
         !strcmp(filter->filter->name,  "blackframe") ||
         !strcmp(filter->filter->name,  "boxblur"   ) ||
         !strcmp(filter->filter->name,  "colormatrix") ||
@@ -691,6 +692,7 @@ int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque
         !strcmp(filter->filter->name, "resample") ||
         !strcmp(filter->filter->name, "showspectrum") ||
         !strcmp(filter->filter->name, "silencedetect") ||
+        !strcmp(filter->filter->name, "subtitles") ||
         !strcmp(filter->filter->name, "thumbnail") ||
 //         !strcmp(filter->filter->name, "scale"      ) ||
         0

libavfilter/vf_subtitles.c

@@ -201,8 +201,6 @@ static const AVFilterPad ass_outputs[] = {
     { NULL }
 };
 
-static const char *const shorthand[] = { "filename", NULL };
-
 #if CONFIG_ASS_FILTER
 
 static const AVOption ass_options[] = {
@@ -240,7 +238,6 @@ AVFilter avfilter_vf_ass = {
     .inputs        = ass_inputs,
     .outputs       = ass_outputs,
     .priv_class    = &ass_class,
-    .shorthand     = shorthand,
 };
 #endif
 
@@ -365,6 +362,5 @@ AVFilter avfilter_vf_subtitles = {
     .inputs        = ass_inputs,
     .outputs       = ass_outputs,
     .priv_class    = &subtitles_class,
-    .shorthand     = shorthand,
 };
 #endif