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, 6 insertions, 0 deletions

diff --git a/src/output_all.h b/src/output_all.h
index 91b6f3f5..6ff45fb7 100644
--- a/src/output_all.h
+++ b/src/output_all.h
@@ -130,6 +130,12 @@ void
 audio_output_all_pause(void);
 
 /**
+ * Drain all audio outputs.
+ */
+void
+audio_output_all_drain(void);
+
+/**
  * Try to cancel data which may still be in the device's buffers.
  */
 void