output_plugin: added inline wrapper functions

Similar to the decoder plugin API: added wrapper functions to increase
code readability.

src/output_control.c

@@ -140,8 +140,7 @@ void audio_output_finish(struct audio_output *ao)
 		g_thread_join(ao->thread);
 	}
 
-	if (ao->plugin->finish)
-		ao->plugin->finish(ao->data);
+	ao_plugin_finish(ao->plugin, ao->data);
 
 	notify_deinit(&ao->notify);
 }

src/output_init.c

@@ -69,7 +69,7 @@ audio_output_init(struct audio_output *ao, const struct config_param *param)
 			if (plugin->test_default_device) {
 				g_warning("Attempting to detect a %s audio "
 					  "device\n", plugin->name);
-				if (plugin->test_default_device()) {
+				if (ao_plugin_test_default_device(plugin)) {
 					g_warning("Successfully detected a %s "
 						  "audio device\n", plugin->name);
 					break;
@@ -109,8 +109,9 @@ audio_output_init(struct audio_output *ao, const struct config_param *param)
 	notify_init(&ao->notify);
 	ao->command = AO_COMMAND_NONE;
 
-	ao->data = plugin->init(ao, format ? &ao->config_audio_format : NULL,
-				param);
+	ao->data = ao_plugin_init(plugin, ao,
+				  format ? &ao->config_audio_format : NULL,
+				  param);
 	if (ao->data == NULL)
 		return 0;
 

src/output_plugin.h

@@ -112,4 +112,70 @@ struct audio_output_plugin {
 	bool (*control)(void *data, int cmd, void *arg);
 };
 
+static inline bool
+ao_plugin_test_default_device(const struct audio_output_plugin *plugin)
+{
+	return plugin->test_default_device != NULL
+		? plugin->test_default_device()
+		: false;
+}
+
+static inline void *
+ao_plugin_init(const struct audio_output_plugin *plugin,
+	       struct audio_output *ao,
+	       const struct audio_format *audio_format,
+	       const struct config_param *param)
+{
+	return plugin->init(ao, audio_format, param);
+}
+
+static inline void
+ao_plugin_finish(const struct audio_output_plugin *plugin, void *data)
+{
+	plugin->finish(data);
+}
+
+static inline bool
+ao_plugin_open(const struct audio_output_plugin *plugin,
+	       void *data, struct audio_format *audio_format)
+{
+	return plugin->open(data, audio_format);
+}
+
+static inline void
+ao_plugin_close(const struct audio_output_plugin *plugin, void *data)
+{
+	plugin->close(data);
+}
+
+static inline void
+ao_plugin_send_tag(const struct audio_output_plugin *plugin,
+		   void *data, const struct tag *tag)
+{
+	if (plugin->send_tag != NULL)
+		plugin->send_tag(data, tag);
+}
+
+static inline bool
+ao_plugin_play(const struct audio_output_plugin *plugin,
+	       void *data, const void *chunk, size_t size)
+{
+	return plugin->play(data, chunk, size);
+}
+
+static inline void
+ao_plugin_cancel(const struct audio_output_plugin *plugin, void *data)
+{
+	if (plugin->cancel != NULL)
+		plugin->cancel(data);
+}
+
+static inline bool
+ao_plugin_pause(const struct audio_output_plugin *plugin, void *data)
+{
+	return plugin->pause != NULL
+		? plugin->pause(data)
+		: false;
+}
+
 #endif

src/output_thread.c

@@ -43,7 +43,7 @@ ao_close(struct audio_output *ao)
 {
 	assert(ao->open);
 
-	ao->plugin->close(ao->data);
+	ao_plugin_close(ao->plugin, ao->data);
 	pcm_convert_deinit(&ao->convert_state);
 	ao->open = false;
 }
@@ -69,9 +69,9 @@ static void ao_play(struct audio_output *ao)
 			return;
 	}
 
-	ret = ao->plugin->play(ao->data, data, size);
+	ret = ao_plugin_play(ao->plugin, ao->data, data, size);
 	if (!ret) {
-		ao->plugin->cancel(ao->data);
+		ao_plugin_cancel(ao->plugin, ao->data);
 		ao_close(ao);
 	}
 
@@ -80,26 +80,18 @@ static void ao_play(struct audio_output *ao)
 
 static void ao_pause(struct audio_output *ao)
 {
-	ao->plugin->cancel(ao->data);
+	bool ret;
 
-	if (ao->plugin->pause != NULL) {
-		/* pause is supported */
-		ao_command_finished(ao);
+	ao_plugin_cancel(ao->plugin, ao->data);
+	ao_command_finished(ao);
 
-		do {
-			bool ret;
-
-			ret = ao->plugin->pause(ao->data);
-			if (!ret) {
-				ao_close(ao);
-				break;
-			}
-		} while (ao->command == AO_COMMAND_NONE);
-	} else {
-		/* pause is not supported - simply close the device */
-		ao_close(ao);
-		ao_command_finished(ao);
-	}
+	do {
+		ret = ao_plugin_pause(ao->plugin, ao->data);
+		if (!ret) {
+			ao_close(ao);
+			break;
+		}
+	} while (ao->command == AO_COMMAND_NONE);
 }
 
 static gpointer audio_output_task(gpointer arg)
@@ -115,8 +107,8 @@ static gpointer audio_output_task(gpointer arg)
 		case AO_COMMAND_OPEN:
 			assert(!ao->open);
 
-			ret = ao->plugin->open(ao->data,
-					       &ao->out_audio_format);
+			ret = ao_plugin_open(ao->plugin, ao->data,
+					     &ao->out_audio_format);
 
 			assert(!ao->open);
 			if (ret) {
@@ -130,8 +122,8 @@ static gpointer audio_output_task(gpointer arg)
 
 		case AO_COMMAND_CLOSE:
 			assert(ao->open);
-			ao->plugin->cancel(ao->data);
 
+			ao_plugin_cancel(ao->plugin, ao->data);
 			ao_close(ao);
 			ao_command_finished(ao);
 			break;
@@ -145,12 +137,12 @@ static gpointer audio_output_task(gpointer arg)
 			break;
 
 		case AO_COMMAND_CANCEL:
-			ao->plugin->cancel(ao->data);
+			ao_plugin_cancel(ao->plugin, ao->data);
 			ao_command_finished(ao);
 			break;
 
 		case AO_COMMAND_SEND_TAG:
-			ao->plugin->send_tag(ao->data, ao->args.tag);
+			ao_plugin_send_tag(ao->plugin, ao->data, ao->args.tag);
 			ao_command_finished(ao);
 			break;