Re: [FFmpeg-devel] [PATCH v2 2/4] ffmpeg: Add display_matrix option

[Marton Balint]

On Mon, 15 Aug 2022, Thilo Borgmann wrote:

diff --git a/fftools/cmdutils.c b/fftools/cmdutils.c
index 18e768b386..22ba654bb0 100644
--- a/fftools/cmdutils.c
+++ b/fftools/cmdutils.c
@@ -131,6 +131,22 @@ int64_t parse_time_or_die(const char *context, const char 
*timestr,
     return us;
 }

+static AVDictionary *parse_dict_or_die(const char *context,
+                                       const char *dict_str)
+{
+    AVDictionary *dict = NULL;
+    int ret = av_dict_parse_string(&dict, dict_str, "=", ",", 0);

Please use the av_opt syntax for the dictionary for better consistency:
av_dict_parse_string(&options, val, "=", ":", 0)

+    if (ret < 0) {
+        av_log(NULL, AV_LOG_FATAL,
+               "Failed to create a dictionary from '%s': %s!\n",
+               dict_str, av_err2str(ret));
+        exit_program(1);
+    }
+
+
+    return dict;
+}
+
 void show_help_options(const OptionDef *options, const char *msg, int 
req_flags,
                        int rej_flags, int alt_flags)
 {
@@ -288,6 +304,8 @@ static int write_option(void *optctx, const OptionDef *po, 
const char *opt,
         *(float *)dst = parse_number_or_die(opt, arg, OPT_FLOAT, -INFINITY, 
INFINITY);
     } else if (po->flags & OPT_DOUBLE) {
         *(double *)dst = parse_number_or_die(opt, arg, OPT_DOUBLE, -INFINITY, 
INFINITY);
+    } else if (po->flags & OPT_DICT) {
+        *(AVDictionary **)dst = parse_dict_or_die(opt, arg);
     } else if (po->u.func_arg) {
         int ret = po->u.func_arg(optctx, opt, arg);
         if (ret < 0) {
diff --git a/fftools/cmdutils.h b/fftools/cmdutils.h
index d87e162ccd..6a519c6546 100644
--- a/fftools/cmdutils.h
+++ b/fftools/cmdutils.h
@@ -129,6 +129,7 @@ typedef struct SpecifierOpt {
         uint64_t ui64;
         float      f;
         double   dbl;
+        AVDictionary *dict;
     } u;
 } SpecifierOpt;

@@ -157,6 +158,7 @@ typedef struct OptionDef {
 #define OPT_DOUBLE 0x20000
 #define OPT_INPUT  0x40000
 #define OPT_OUTPUT 0x80000
+#define OPT_DICT  0x100000
      union {
         void *dst_ptr;
         int (*func_arg)(void *, const char *, const char *);
diff --git a/fftools/ffmpeg_opt.c b/fftools/ffmpeg_opt.c
index 97f14b2a5b..cc038aae6b 100644
--- a/fftools/ffmpeg_opt.c
+++ b/fftools/ffmpeg_opt.c
@@ -62,6 +62,7 @@
 #define SPECIFIER_OPT_FMT_ui64 "%"PRIu64
 #define SPECIFIER_OPT_FMT_f    "%f"
 #define SPECIFIER_OPT_FMT_dbl  "%lf"
+#define SPECIFIER_OPT_FMT_dict "%p"

The error message which uses this will make no sense. You should modify 
WARN_MULTIPLE_OPT_USAGE to make something sensible out of a dict.

E.g. make SPECIFIER_OPT_FMT_dict "%s" and create 
#define SPECIFIER_OPT_FUNC_dict as a dumper function. (the dumper function 
of other types can be #defined as identities)

Regards,
Marton
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