Add a property async_compensation to switch asynchronous SRC

This commit implements a property to enable asynchronous sample rate
conversion (SRC) in the PR obsproject/obs-studio#6351.
This commit relies on the PR so that the implementation is disabled by
default.
Assuming the user of this plugin has enough knowledge for asynchronous
sample rate and genlock, the option is disabled by default.

CMakeLists.txt

@@ -17,6 +17,7 @@ set(ID_PREFIX "net.nagater.obs-h8819-source.")
 set(LINUX_MAINTAINER_EMAIL "[email protected]")
 
 option(ENABLE_COVERAGE "Enable coverage option for GCC" OFF)
+option(ENABLE_ASYNC_COMPENSATION "Enable async-compensation property for the PR 6351" OFF)
 
 # TAKE NOTE: No need to edit things past this point
 

data/locale/en-US.ini

@@ -2,3 +2,4 @@
 "Ethernet device"="Ethernet device"
 "Channel Left"="Channel Left"
 "Channel Right"="Channel Right"
+AsyncCompensation="Enable Asynchronous Compensation"

data/locale/ja-JP.ini

@@ -2,3 +2,4 @@
 "Ethernet device"="イーサネットデバイス"
 "Channel Left"="左チャンネル"
 "Channel Right"="右チャンネル"
+AsyncCompensation="非同期補償を有効にする"

src/plugin-macros.h.in

@@ -27,6 +27,8 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #cmakedefine OS_LINUX
 #cmakedefine OS_MACOS
 
+#cmakedefine ENABLE_ASYNC_COMPENSATION
+
 #define blog(level, msg, ...) blog(level, "[" PLUGIN_NAME "] " msg, ##__VA_ARGS__)
 
 #endif // PLUGINNAME_H

src/source.c

@@ -40,6 +40,9 @@ static obs_properties_t *get_properties(void *data)
 	capdev_enum_devices(device_name_enum_cb, prop);
 	obs_properties_add_int(props, "channel_l", obs_module_text("Channel Left"), 1, 40, 1);
 	obs_properties_add_int(props, "channel_r", obs_module_text("Channel Right"), 1, 40, 1);
+#ifdef ENABLE_ASYNC_COMPENSATION
+	obs_properties_add_bool(props, "async_compensation", obs_module_text("AsyncCompensation"));
+#endif
 
 	return props;
 }
@@ -98,6 +101,10 @@ static void update(void *data, obs_data_t *settings)
 
 	if (channel_l != s->channel_l || channel_r != s->channel_r)
 		update_channels(s, channel_l, channel_r);
+
+#ifdef ENABLE_ASYNC_COMPENSATION
+	obs_source_set_async_compensation(s->context, obs_data_get_bool(settings, "async_compensation"));
+#endif
 }
 
 static void *create(obs_data_t *settings, obs_source_t *source)