output_plugin: added methods enable() and disable()

With these methods, an output plugin can allocate some global
resources only if it is actually enabled.  The method enable() is
called after daemonization, which allows for more sophisticated
resource allocation during that method.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/output_internal.h b/src/output_internal.h
index f27a10ec..0c25348a 100644
--- a/src/output_internal.h
+++ b/src/output_internal.h
@@ -27,6 +27,8 @@
 
 enum audio_output_command {
 	AO_COMMAND_NONE = 0,
+	AO_COMMAND_ENABLE,
+	AO_COMMAND_DISABLE,
 	AO_COMMAND_OPEN,
 
 	/**
@@ -71,6 +73,12 @@ struct audio_output {
 	bool enabled;
 
 	/**
+	 * Is this device actually enabled, i.e. the "enable" method
+	 * has succeeded?
+	 */
+	bool really_enabled;
+
+	/**
 	 * Is the device (already) open and functional?
 	 *
 	 * This attribute may only be modified by the output thread.