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, 10 insertions, 1 deletions

diff --git a/Alc/backends/loopback.c b/Alc/backends/loopback.c
index eafed3e3..ae7e32b4 100644
--- a/Alc/backends/loopback.c
+++ b/Alc/backends/loopback.c
@@ -54,6 +54,14 @@ static void loopback_stop_playback(ALCdevice *device)
     (void)device;
 }
 
+
+static ALint64 loopback_get_latency(ALCdevice *device)
+{
+    (void)device;
+    return 0;
+}
+
+
 static const BackendFuncs loopback_funcs = {
     loopback_open_playback,
     loopback_close_playback,
@@ -65,7 +73,8 @@ static const BackendFuncs loopback_funcs = {
     NULL,
     NULL,
     NULL,
-    NULL
+    NULL,
+    loopback_get_latency
 };
 
 ALCboolean alc_loopback_init(BackendFuncs *func_list)