decklink_set_profile: handle help

src/blackmagic_common.cpp

@@ -399,6 +399,12 @@ bool decklink_set_profile(IDeckLink *deckLink, bmd_option const &req_profile, bo
                 return true;
         }
 
+        if (req_profile.is_help()) {
+                printf("Available profiles:\n");
+                print_bmd_device_profiles("\t");
+                return false;
+        }
+
         bool ret = true;
         IDeckLinkProfileManager *manager = nullptr;
         IDeckLinkProfileIterator *it = nullptr;
@@ -695,6 +701,10 @@ const char *bmd_option::get_string() const {
 bool bmd_option::is_default() const {
         return m_type == type_tag::t_default;
 }
+bool bmd_option::is_help() const {
+        return m_type == type_tag::t_string &&
+               strcmp(get_string(), "help") == 0;
+}
 bool bmd_option::is_user_set() const {
         return m_user_specified;
 }
@@ -727,6 +737,11 @@ void bmd_option::parse(const char *val)
                 return;
         }
 
+        if (strcmp(val, "help") == 0) {
+                set_string(val);
+                return;
+        }
+
         // explicitly typed (either "str" or 'fcc')
         if ((val[0] == '"' && val[strlen(val) - 1] == '"') || (val[0] == '\'' && val[strlen(val) - 1] == '\'')) {
                 string raw_val(val + 1);

src/blackmagic_common.hpp

@@ -98,6 +98,7 @@ public:
         explicit bmd_option(int64_t val, bool user_spec = true);
         explicit bmd_option(bool val, bool user_spec = true);
         bool is_default() const;
+        [[nodiscard]] bool is_help() const;
         bool is_user_set() const;
         void set_keep();
         bool keep() const;