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/mmdevapi.c b/Alc/backends/mmdevapi.c
index 0edd8e60..bffc463a 100644
--- a/Alc/backends/mmdevapi.c
+++ b/Alc/backends/mmdevapi.c
@@ -937,6 +937,13 @@ static void MMDevApiStopPlayback(ALCdevice *device)
 }
 
 
+static ALint64 MMDevApiGetLatency(ALCdevice *device)
+{
+    (void)device;
+    return 0;
+}
+
+
 static const BackendFuncs MMDevApiFuncs = {
     MMDevApiOpenPlayback,
     MMDevApiClosePlayback,
@@ -948,7 +955,8 @@ static const BackendFuncs MMDevApiFuncs = {
     NULL,
     NULL,
     NULL,
-    NULL
+    NULL,
+    MMDevApiGetLatency
 };