Add a device method to retrieve the active latency

This is effectively the time until the next update will be heard by the user,
or the closest approximation thereof, in nanoseconds.

1 files changed, 9 insertions, 1 deletions

diff --git a/Alc/backends/winmm.c b/Alc/backends/winmm.c
index b7c637d6..ecd76e52 100644
--- a/Alc/backends/winmm.c
+++ b/Alc/backends/winmm.c
@@ -705,6 +705,13 @@ static ALCuint WinMMAvailableSamples(ALCdevice *Device)
 }
 
 
+static ALint64 WinMMGetLatency(ALCdevice *device)
+{
+    (void)device;
+    return 0;
+}
+
+
 static const BackendFuncs WinMMFuncs = {
     WinMMOpenPlayback,
     WinMMClosePlayback,
@@ -716,7 +723,8 @@ static const BackendFuncs WinMMFuncs = {
     WinMMStartCapture,
     WinMMStopCapture,
     WinMMCaptureSamples,
-    WinMMAvailableSamples
+    WinMMAvailableSamples,
+    WinMMGetLatency
 };
 
 ALCboolean alcWinMMInit(BackendFuncs *FuncList)