From 33abe03ac137bd1e4bf4af90731ec177d34298a8 Mon Sep 17 00:00:00 2001
From: Thilo Borgmann <thilo.borgmann@mail.de>
Date: Mon, 15 Aug 2022 21:00:18 +0200
Subject: [PATCH v2 4/4] ffmpeg: Allow printing of option arguments in help
 output

---
 fftools/cmdutils.c |  5 +++++
 libavutil/opt.c    | 14 +++++++++++++-
 libavutil/opt.h    |  8 ++++++++
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/fftools/cmdutils.c b/fftools/cmdutils.c
index 22ba654bb0..dae018f83a 100644
--- a/fftools/cmdutils.c
+++ b/fftools/cmdutils.c
@@ -172,6 +172,11 @@ void show_help_options(const OptionDef *options, const char *msg, int req_flags,
             av_strlcat(buf, po->argname, sizeof(buf));
         }
         printf("-%-17s  %s\n", buf, po->help);
+
+        if (po->args) {
+            const AVClass *p = po->args;
+            av_arg_show(&p, NULL);
+        }
     }
     printf("\n");
 }
diff --git a/libavutil/opt.c b/libavutil/opt.c
index a3940f47fb..89ef111690 100644
--- a/libavutil/opt.c
+++ b/libavutil/opt.c
@@ -1256,7 +1256,7 @@ static void opt_list(void *obj, void *av_log_obj, const char *unit,
             av_log(av_log_obj, AV_LOG_INFO, "     %-15s ", opt->name);
         else
             av_log(av_log_obj, AV_LOG_INFO, "  %s%-17s ",
-                   (opt->flags & AV_OPT_FLAG_FILTERING_PARAM) ? " " : "-",
+                   (opt->flags & (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_ARGUMENT)) ? " " : "-",
                    opt->name);
 
         switch (opt->type) {
@@ -1329,6 +1329,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
                 av_log(av_log_obj, AV_LOG_INFO, "%-12s ", "");
                 break;
         }
+        if (!(opt->flags & AV_OPT_FLAG_ARGUMENT)) {
         av_log(av_log_obj, AV_LOG_INFO, "%c%c%c%c%c%c%c%c%c%c%c",
                (opt->flags & AV_OPT_FLAG_ENCODING_PARAM)  ? 'E' : '.',
                (opt->flags & AV_OPT_FLAG_DECODING_PARAM)  ? 'D' : '.',
@@ -1341,6 +1342,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
                (opt->flags & AV_OPT_FLAG_BSF_PARAM)       ? 'B' : '.',
                (opt->flags & AV_OPT_FLAG_RUNTIME_PARAM)   ? 'T' : '.',
                (opt->flags & AV_OPT_FLAG_DEPRECATED)      ? 'P' : '.');
+        }
 
         if (opt->help)
             av_log(av_log_obj, AV_LOG_INFO, " %s", opt->help);
@@ -1456,6 +1458,16 @@ int av_opt_show2(void *obj, void *av_log_obj, int req_flags, int rej_flags)
     return 0;
 }
 
+int av_arg_show(void *obj, void *av_log_obj)
+{
+    if (!obj)
+        return -1;
+
+    opt_list(obj, av_log_obj, NULL, AV_OPT_FLAG_ARGUMENT, 0, -1);
+
+    return 0;
+}
+
 void av_opt_set_defaults(void *s)
 {
     av_opt_set_defaults2(s, 0, 0);
diff --git a/libavutil/opt.h b/libavutil/opt.h
index 461b5d3b6b..dce3483237 100644
--- a/libavutil/opt.h
+++ b/libavutil/opt.h
@@ -297,6 +297,7 @@ typedef struct AVOption {
 #define AV_OPT_FLAG_FILTERING_PARAM (1<<16) ///< a generic parameter which can be set by the user for filtering
 #define AV_OPT_FLAG_DEPRECATED      (1<<17) ///< set if option is deprecated, users should refer to AVOption.help text for more information
 #define AV_OPT_FLAG_CHILD_CONSTS    (1<<18) ///< set if option constants can also reside in child objects
+#define AV_OPT_FLAG_ARGUMENT        (1<<19) ///< set if option is an argument to another option
 //FIXME think about enc-audio, ... style flags
 
     /**
@@ -386,6 +387,13 @@ typedef struct AVOptionRanges {
  */
 int av_opt_show2(void *obj, void *av_log_obj, int req_flags, int rej_flags);
 
+/**
+ * Show the obj arguments.
+ *
+ * @param av_log_obj log context to use for showing the options
+ */
+int av_arg_show(void *obj, void *av_log_obj);
+
 /**
  * Set the values of all AVOption fields to their default values.
  *
-- 
2.20.1 (Apple Git-117)