libobs: Add API to get last OBS version of a source

Allows the ability to change the behavior of a source depending on the
previous OBS version.

libobs/obs-internal.h

@@ -563,6 +563,7 @@ struct obs_source {
 	/* general exposed flags that can be set for the source */
 	uint32_t flags;
 	uint32_t default_flags;
+	uint32_t last_obs_ver;
 
 	/* indicates ownership of the info.id buffer */
 	bool owns_info_id;
@@ -737,6 +738,11 @@ struct audio_monitor *audio_monitor_create(obs_source_t *source);
 void audio_monitor_reset(struct audio_monitor *monitor);
 extern void audio_monitor_destroy(struct audio_monitor *monitor);
 
+extern obs_source_t *obs_source_create_set_last_ver(const char *id,
+						    const char *name,
+						    obs_data_t *settings,
+						    obs_data_t *hotkey_data,
+						    uint32_t last_obs_ver);
 extern void obs_source_destroy(struct obs_source *source);
 
 enum view_type {

libobs/obs-source.c

@@ -307,11 +307,10 @@ static void obs_source_init_audio_hotkeys(struct obs_source *source)
 		obs_source_hotkey_push_to_talk, source);
 }
 
-static obs_source_t *obs_source_create_internal(const char *id,
-						const char *name,
-						obs_data_t *settings,
-						obs_data_t *hotkey_data,
-						bool private)
+static obs_source_t *
+obs_source_create_internal(const char *id, const char *name,
+			   obs_data_t *settings, obs_data_t *hotkey_data,
+			   bool private, uint32_t last_obs_ver)
 {
 	struct obs_source *source = bzalloc(sizeof(struct obs_source));
 
@@ -336,6 +335,7 @@ static obs_source_t *obs_source_create_internal(const char *id,
 	source->mute_unmute_key = OBS_INVALID_HOTKEY_PAIR_ID;
 	source->push_to_mute_key = OBS_INVALID_HOTKEY_ID;
 	source->push_to_talk_key = OBS_INVALID_HOTKEY_ID;
+	source->last_obs_ver = last_obs_ver;
 
 	if (!obs_source_init_context(source, settings, name, hotkey_data,
 				     private))
@@ -388,13 +388,23 @@ obs_source_t *obs_source_create(const char *id, const char *name,
 				obs_data_t *settings, obs_data_t *hotkey_data)
 {
 	return obs_source_create_internal(id, name, settings, hotkey_data,
-					  false);
+					  false, LIBOBS_API_VER);
 }
 
 obs_source_t *obs_source_create_private(const char *id, const char *name,
 					obs_data_t *settings)
 {
-	return obs_source_create_internal(id, name, settings, NULL, true);
+	return obs_source_create_internal(id, name, settings, NULL, true,
+					  LIBOBS_API_VER);
+}
+
+obs_source_t *obs_source_create_set_last_ver(const char *id, const char *name,
+					     obs_data_t *settings,
+					     obs_data_t *hotkey_data,
+					     uint32_t last_obs_ver)
+{
+	return obs_source_create_internal(id, name, settings, hotkey_data,
+					  false, last_obs_ver);
 }
 
 static char *get_new_filter_name(obs_source_t *dst, const char *name)
@@ -4695,3 +4705,10 @@ bool obs_source_audio_active(const obs_source_t *source)
 		       ? os_atomic_load_bool(&source->audio_active)
 		       : false;
 }
+
+uint32_t obs_source_get_last_obs_version(const obs_source_t *source)
+{
+	return obs_source_valid(source, "obs_source_get_last_obs_version")
+		       ? source->last_obs_ver
+		       : 0;
+}

libobs/obs.c

@@ -1775,11 +1775,13 @@ static obs_source_t *obs_load_source_type(obs_data_t *source_data)
 	int di_mode;
 	int monitoring_type;
 
-	source = obs_source_create(id, name, settings, hotkeys);
+	prev_ver = (uint32_t)obs_data_get_int(source_data, "prev_ver");
+
+	source = obs_source_create_set_last_ver(id, name, settings, hotkeys,
+						prev_ver);
 
 	obs_data_release(hotkeys);
 
-	prev_ver = (uint32_t)obs_data_get_int(source_data, "prev_ver");
 	caps = obs_source_get_output_flags(source);
 
 	obs_data_set_default_double(source_data, "volume", 1.0);

libobs/obs.h

@@ -1315,6 +1315,8 @@ EXPORT bool obs_source_async_decoupled(const obs_source_t *source);
 EXPORT void obs_source_set_audio_active(obs_source_t *source, bool show);
 EXPORT bool obs_source_audio_active(const obs_source_t *source);
 
+EXPORT uint32_t obs_source_get_last_obs_version(const obs_source_t *source);
+
 /* ------------------------------------------------------------------------- */
 /* Transition-specific functions */
 enum obs_transition_target {