output_thread: added command DRAIN

This command manually drains the hardware buffer.  This is useful when
the player thread want to make sure that everything has been played.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/output_internal.h b/src/output_internal.h
index 6b81bbc7..de1b15c2 100644
--- a/src/output_internal.h
+++ b/src/output_internal.h
@@ -40,6 +40,13 @@ enum audio_output_command {
 
 	AO_COMMAND_CLOSE,
 	AO_COMMAND_PAUSE,
+
+	/**
+	 * Drains the internal (hardware) buffers of the device.  This
+	 * operation may take a while to complete.
+	 */
+	AO_COMMAND_DRAIN,
+
 	AO_COMMAND_CANCEL,
 	AO_COMMAND_KILL
 };