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cmdutils: allow -h filter=<name> to print information about a filter.

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This commit is contained in:
Anton Khirnov 2013-03-28 09:29:00 +01:00
parent e19e8aeeaa
commit 921046008f
2 changed files with 44 additions and 0 deletions
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40
cmdutils.c
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@ -1268,6 +1268,44 @@ static void show_help_muxer(const char *name)
show_help_children(fmt->priv_class, AV_OPT_FLAG_ENCODING_PARAM);
}
static void show_help_filter(const char *name)
{
const AVFilter *f = avfilter_get_by_name(name);
int i, count;
if (!name) {
av_log(NULL, AV_LOG_ERROR, "No filter name specified.\n");
return;
} else if (!f) {
av_log(NULL, AV_LOG_ERROR, "Unknown filter '%s'.\n", name);
return;
}
printf("Filter %s [%s]:\n", f->name, f->description);
printf(" Inputs:\n");
count = avfilter_pad_count(f->inputs);
for (i = 0; i < count; i++) {
printf(" %d %s (%s)\n", i, avfilter_pad_get_name(f->inputs, i),
media_type_string(avfilter_pad_get_type(f->inputs, i)));
}
if (f->flags & AVFILTER_FLAG_DYNAMIC_INPUTS)
printf(" dynamic (depending on the options)\n");
printf(" Outputs:\n");
count = avfilter_pad_count(f->outputs);
for (i = 0; i < count; i++) {
printf(" %d %s (%s)\n", i, avfilter_pad_get_name(f->outputs, i),
media_type_string(avfilter_pad_get_type(f->outputs, i)));
}
if (f->flags & AVFILTER_FLAG_DYNAMIC_OUTPUTS)
printf(" dynamic (depending on the options)\n");
if (f->priv_class)
show_help_children(f->priv_class, AV_OPT_FLAG_VIDEO_PARAM |
AV_OPT_FLAG_AUDIO_PARAM);
}
int show_help(void *optctx, const char *opt, const char *arg)
{
char *topic, *par;
@ -1288,6 +1326,8 @@ int show_help(void *optctx, const char *opt, const char *arg)
show_help_demuxer(par);
} else if (!strcmp(topic, "muxer")) {
show_help_muxer(par);
} else if (!strcmp(topic, "filter")) {
show_help_filter(par);
} else {
show_help_default(topic, par);
}

4
doc/avtools-common-opts.texi
View File

@ -74,6 +74,10 @@ Print detailed information about the demuxer named @var{demuxer_name}. Use the
Print detailed information about the muxer named @var{muxer_name}. Use the
@option{-formats} option to get a list of all muxers and demuxers.
@item filter=@var{filter_name}
Print detailed information about the filter name @var{filter_name}. Use the
@option{-filters} option to get a list of all filters.
@end table
@item -version