os: extend Audio_out with queue query method

Issue #1767.
2015-11-04 17:49:58 +01:00 · 2015-11-04 17:49:58 +01:00 · 83e5a64864
parent d8b95c263b
commit 83e5a64864
1 changed files with 15 additions and 0 deletions
--- a/repos/os/include/audio_out_session/audio_out_session.h
+++ b/repos/os/include/audio_out_session/audio_out_session.h
@ -177,6 +177,21 @@ class Audio_out::Stream
 		 */
 		unsigned tail() const { return _tail; }

+		/**
+		 * Number of packets between playback and allocation position
+		 *
+		 * \return number
+		 */
+		unsigned queued() const
+		{
+			if (_tail > _pos)
+				return _tail - _pos;
+			else if (_pos > _tail)
+				return QUEUE_SIZE - (_pos - _tail);
+			else
+				return 0;
+		}
+
 		/**
 		 * Retrieve next packet for given packet
 		 *