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options: print lavfi filter list with --vf=lavfi=help

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This commit is contained in:
wm4 2013-11-23 21:35:52 +01:00
parent e99ae17a80
commit 057af4697c
1 changed files with 40 additions and 0 deletions
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40
video/filter/vf_lavfi.c
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@ -325,6 +325,45 @@ static int vf_open(vf_instance_t *vf, char *args)
return 1;
}
static bool is_single_video_only(const AVFilterPad *pads)
{
if (!pads)
return false;
return pads[0].name && pads[0].type == AVMEDIA_TYPE_VIDEO && !pads[1].name;
}
// Does it have exactly one video input and one video output?
static bool is_usable(const AVFilter *filter)
{
return is_single_video_only(filter->inputs) &&
is_single_video_only(filter->outputs);
}
static void print_help(void)
{
mp_msg(MSGT_CFGPARSER, MSGL_INFO, "List of libavfilter filters:\n");
for (const AVFilter *filter = avfilter_next(NULL); filter;
filter = avfilter_next(filter))
{
if (is_usable(filter)) {
mp_msg(MSGT_CFGPARSER, MSGL_INFO, " %-16s %s\n",
filter->name, filter->description);
}
}
mp_msg(MSGT_CFGPARSER, MSGL_INFO, "\n"
"This lists video->video filters only. Refer to\n"
"\n"
" https://ffmpeg.org/ffmpeg-filters.html\n"
"\n"
"to see how to use each filter and what arguments each filter takes.\n"
"Also, be sure to quote the FFmpeg filter string properly, e.g.:\n"
"\n"
" \"--vf=lavfi=[gradfun=20:30]\"\n"
"\n"
"Otherwise, mpv and libavfilter syntax will conflict.\n"
"\n");
}
#define OPT_BASE_STRUCT struct vf_priv_s
static const m_option_t vf_opts_fields[] = {
OPT_STRING("graph", cfg_graph, M_OPT_MIN, .min = 1),
@ -340,4 +379,5 @@ const vf_info_t vf_info_lavfi = {
.priv_size = sizeof(struct vf_priv_s),
.priv_defaults = &vf_priv_dflt,
.options = vf_opts_fields,
.print_help = print_help,
};