Throttle calls to EdsOpenSession

Together with 09acf9b this fixes #8
v002 · Aug 15, 2017 · 1f33caa · 1f33caa
1 parent 09acf9b
commit 1f33caa
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diff --git a/Camera Live/SyPCanonDSLR.h b/Camera Live/SyPCanonDSLR.h
@@ -50,5 +50,6 @@
     SyPCanonEVFImageBuffer *_nextImage;
     SyPImageBuffer *_pendingImage;
     NSError *_pendingError;
+    NSTimeInterval _lastSession;
 }
 @end
diff --git a/Camera Live/SyPCanonDSLR.m b/Camera Live/SyPCanonDSLR.m
@@ -464,7 +464,14 @@ - (NSError *)startSessionOnQueue
         if (OSAtomicCompareAndSwapPtrBarrier(NULL, self, (void **)&mSession))
         {
             _hasSession = YES;
+            // Throttle sessions or the EdsOpenSession call never returns
+            NSTimeInterval since = [NSDate timeIntervalSinceReferenceDate] - _lastSession;
+            if (since < 0.5)
+            {
+                usleep((0.5 - since) * USEC_PER_SEC);
+            }
             EdsError result = EdsOpenSession(_camera);
+            _lastSession = [NSDate timeIntervalSinceReferenceDate];
             error = [SyPCanonDSLR errorForEDSError:result];
         }
         else