Two additional functions to support gain selection for media files (sound events).

Allows better compatibility with Zeta's preference application.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8571 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/media/MediaFiles.h

@@ -31,10 +31,18 @@ virtual		status_t GetRefFor(
 				const char * type,
 				const char * item,
 				entry_ref * out_ref);
+			status_t GetAudioGainFor(
+				const char * type,
+				const char * item,
+				float * out_audio_gain);
 virtual		status_t SetRefFor(
 				const char * type,
 				const char * item,
 				const entry_ref & ref);
+			status_t SetAudioGainFor(
+				const char * type,
+				const char * item,
+				float audio_gain);	
 virtual		status_t RemoveRefFor(		//	This might better be called "ClearRefFor"
 				const char * type,		//	but it's too late now...
 				const char * item,

src/kits/media/MediaFiles.cpp

@@ -185,6 +185,17 @@ BMediaFiles::GetRefFor(const char *type,
 }
 
 
+status_t
+BMediaFiles::GetAudioGainFor(const char * type,
+							 const char * item,
+							 float * out_audio_gain)
+{
+	UNIMPLEMENTED();
+	*out_audio_gain = 1.0f;
+	return B_OK;
+}
+
+
 /* virtual */ status_t
 BMediaFiles::SetRefFor(const char *type,
 					   const char *item,
@@ -211,6 +222,16 @@ BMediaFiles::SetRefFor(const char *type,
 }
 
 
+status_t
+BMediaFiles::SetAudioGainFor(const char * type,
+							 const char * item,
+							 float audio_gain)
+{
+	UNIMPLEMENTED();
+	return B_OK;
+}
+
+
 /* virtual */ status_t
 BMediaFiles::RemoveRefFor(const char *type,
 						  const char *item,