feat: use CAPABILITY_PULL_RENDERER for legacy pacing mode

VoidLink/Stream/Connection.m

@@ -9,6 +9,7 @@
 #import "Connection.h"
 #import "Plot.h"
 #import "Utils.h"
+#import "DataManager.h"
 
 #import <VideoToolbox/VideoToolbox.h>
 
@@ -505,10 +506,19 @@ void ClSetControllerLED(uint16_t controllerNumber, uint8_t r, uint8_t g, uint8_t
     LiInitializeVideoCallbacks(&_drCallbacks);
     _drCallbacks.setup = DrDecoderSetup;
     _drCallbacks.cleanup = DrCleanup;
-    _drCallbacks.submitDecodeUnit = DrSubmitDecodeUnit;
-    _drCallbacks.capabilities = CAPABILITY_DIRECT_SUBMIT |
-                                CAPABILITY_REFERENCE_FRAME_INVALIDATION_HEVC |
-                                CAPABILITY_REFERENCE_FRAME_INVALIDATION_AV1;
+    // Use pull renderer for legacy frame pacing, direct submit for modern frame pacing
+    DataManager* dataMan = [[DataManager alloc] init];
+    if ([[dataMan getSettings].framePacingMode integerValue] == FramePacingModeLegacy) {
+        _drCallbacks.capabilities = CAPABILITY_PULL_RENDERER |
+                                    CAPABILITY_REFERENCE_FRAME_INVALIDATION_HEVC |
+                                    CAPABILITY_REFERENCE_FRAME_INVALIDATION_AV1;
+        _drCallbacks.submitDecodeUnit = NULL;
+    } else {
+        _drCallbacks.capabilities = CAPABILITY_DIRECT_SUBMIT |
+                                    CAPABILITY_REFERENCE_FRAME_INVALIDATION_HEVC |
+                                    CAPABILITY_REFERENCE_FRAME_INVALIDATION_AV1;
+        _drCallbacks.submitDecodeUnit = DrSubmitDecodeUnit;
+    }
 
     LiInitializeAudioCallbacks(&_arCallbacks);
     _arCallbacks.init = ArInit;