diff --git a/src/CoreVideo/CMakeLists.txt b/src/CoreVideo/CMakeLists.txt
index 25e5d2486..31e5b7c77 100644
--- a/src/CoreVideo/CMakeLists.txt
+++ b/src/CoreVideo/CMakeLists.txt
@@ -11,6 +11,8 @@ add_framework(CoreVideo
     VERSION "A"
 
     SOURCES
+	src/constants.c
+	src/stubs.c
         src/CVDisplayLink.mm
 
     DEPENDENCIES
diff --git a/src/CoreVideo/src/constants.c b/src/CoreVideo/src/constants.c
new file mode 100644
index 000000000..e3b4354dd
--- /dev/null
+++ b/src/CoreVideo/src/constants.c
@@ -0,0 +1,8 @@
+#include <CoreFoundation/CoreFoundation.h>
+
+const CFStringRef kCVImageBufferChromaLocationBottomFieldKey = CFSTR("CVImageBufferChromaLocationBottomField");
+const CFStringRef kCVImageBufferChromaLocationTopFieldKey = CFSTR("CVImageBufferChromaLocationTopField");
+const CFStringRef kCVImageBufferChromaLocation_Left = CFSTR("Left");
+const CFStringRef kCVPixelBufferIOSurfacePropertiesKey = CFSTR("IOSurfaceProperties");
+const CFStringRef kCVPixelBufferOpenGLCompatibilityKey = CFSTR("OpenGLCompatibility");
+const CFStringRef kCVPixelBufferPixelFormatTypeKey = CFSTR("PixelFormatType");
diff --git a/src/CoreVideo/src/stubs.c b/src/CoreVideo/src/stubs.c
new file mode 100644
index 000000000..f82aadb08
--- /dev/null
+++ b/src/CoreVideo/src/stubs.c
@@ -0,0 +1,66 @@
+#include <stdio.h>
+
+void* CVBufferRelease(void)
+{
+	printf("STUB: %s\n", __PRETTY_FUNCTION__);
+	return NULL;
+}
+
+void* CVPixelBufferCreateWithPlanarBytes(void)
+{
+	printf("STUB: %s\n", __PRETTY_FUNCTION__);
+	return NULL;
+}
+void* CVPixelBufferGetBaseAddress(void)
+{
+	printf("STUB: %s\n", __PRETTY_FUNCTION__);
+	return NULL;
+}
+
+void* CVPixelBufferGetBaseAddressOfPlane(void)
+{
+	printf("STUB: %s\n", __PRETTY_FUNCTION__);
+	return NULL;
+}
+
+void* CVPixelBufferGetBytesPerRowOfPlane(void)
+{
+	printf("STUB: %s\n", __PRETTY_FUNCTION__);
+	return NULL;
+}
+
+void* CVPixelBufferGetHeight(void)
+{
+	printf("STUB: %s\n", __PRETTY_FUNCTION__);
+	return NULL;
+}
+
+void* CVPixelBufferGetIOSurface(void)
+{
+	printf("STUB: %s\n", __PRETTY_FUNCTION__);
+	return NULL;
+}
+
+void* CVPixelBufferGetPlaneCount(void)
+{
+	printf("STUB: %s\n", __PRETTY_FUNCTION__);
+	return NULL;
+}
+
+void* CVPixelBufferGetWidth(void)
+{
+	printf("STUB: %s\n", __PRETTY_FUNCTION__);
+	return NULL;
+}
+
+void* CVPixelBufferLockBaseAddress(void)
+{
+	printf("STUB: %s\n", __PRETTY_FUNCTION__);
+	return NULL;
+}
+
+void* CVPixelBufferUnlockBaseAddress(void)
+{
+	printf("STUB: %s\n", __PRETTY_FUNCTION__);
+	return NULL;
+}
diff --git a/src/VideoToolbox/src/VideoToolbox.m b/src/VideoToolbox/src/VideoToolbox.m
index afa8095c7..ca6566087 100644
--- a/src/VideoToolbox/src/VideoToolbox.m
+++ b/src/VideoToolbox/src/VideoToolbox.m
@@ -22,6 +22,21 @@
 #include <stdlib.h>
 #include <stdio.h>
 
+#include <CoreFoundation/CoreFoundation.h>
+
+const CFStringRef kVTCompressionPropertyKey_AllowFrameReordering = CFSTR("AllowFrameReordering");
+const CFStringRef kVTCompressionPropertyKey_AverageBitRate = CFSTR("AverageBitRate");
+const CFStringRef kVTCompressionPropertyKey_MaxKeyFrameInterval = CFSTR("MaxKeyFrameInterval");
+const CFStringRef kVTCompressionPropertyKey_ProfileLevel = CFSTR("ProfileLevel");
+const CFStringRef kVTCompressionPropertyKey_RealTime = CFSTR("RealTime");
+const CFStringRef kVTCompressionPropertyKey_UsingHardwareAcceleratedVideoEncoder = CFSTR("UsingHardwareAcceleratedVideoEncoder");
+const CFStringRef kVTDecompressionPropertyKey_UsingHardwareAcceleratedVideoDecoder = CFSTR("UsingHardwareAcceleratedVideoDecoder");
+const CFStringRef kVTEncodeFrameOptionKey_ForceKeyFrame = CFSTR("ForceKeyFrame");
+const CFStringRef kVTProfileLevel_H264_Baseline_AutoLevel = CFSTR("AutoLevel");
+const CFStringRef kVTProfileLevel_H264_Main_AutoLevel = CFSTR("AutoLevel");
+const CFStringRef kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder = CFSTR("EnableHardwareAcceleratedVideoDecoder");
+const CFStringRef kVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder = CFSTR("EnableHardwareAcceleratedVideoEncoder");
+
 static int verbose = 0;
 
 __attribute__((constructor))
diff --git a/src/external/cocotron b/src/external/cocotron
index e071d599c..5c854296a 160000
--- a/src/external/cocotron
+++ b/src/external/cocotron
@@ -1 +1 @@
-Subproject commit e071d599cb929db39c2aa8bb6f1dc5fbe039926d
+Subproject commit 5c854296a5265bd3b7324bb40b97ad7e1107a393
diff --git a/src/external/foundation b/src/external/foundation
index 4dc6dae17..9eb51cd2f 160000
--- a/src/external/foundation
+++ b/src/external/foundation
@@ -1 +1 @@
-Subproject commit 4dc6dae179c79a856037fd4d764ea65a136c2d9f
+Subproject commit 9eb51cd2f336f108cbade19662d481238db330fc
diff --git a/src/frameworks/AVFoundation/constants.m b/src/frameworks/AVFoundation/constants.m
index 52091fe52..9f947c23b 100644
--- a/src/frameworks/AVFoundation/constants.m
+++ b/src/frameworks/AVFoundation/constants.m
@@ -30,3 +30,11 @@ NSString *const AVErrorPresentationTimeStampKey = @"AVErrorPresentationTimeStamp
 NSString *const AVErrorPersistentTrackIDKey = @"AVErrorPersistentTrackIDKey";
 NSString *const AVErrorFileTypeKey = @"AVErrorFileTypeKey";
 NSString *const AVFoundationErrorDomain = @"AVFoundationErrorDomain";
+NSString *const AVCaptureDeviceWasConnectedNotification = @"AVCaptureDeviceWasConnectedNotification";
+NSString *const AVCaptureDeviceWasDisconnectedNotification = @"AVCaptureDeviceWasDisconnectedNotification";
+NSString *const AVCaptureSessionPreset1280x720 = @"AVCaptureSessionPreset1280x720";
+NSString *const AVCaptureSessionPreset352x288 = @"AVCaptureSessionPreset352x288";
+NSString *const AVCaptureSessionPreset640x480 = @"AVCaptureSessionPreset640x480";
+NSString *const AVCaptureSessionPresetLow = @"AVCaptureSessionPresetLow";
+NSString *const AVMediaTypeAudio = @"soun";
+NSString *const AVMediaTypeVideo = @"vide";
diff --git a/src/frameworks/CoreMedia/src/CoreMedia.c b/src/frameworks/CoreMedia/src/CoreMedia.c
index 4a388b088..3d76e8103 100644
--- a/src/frameworks/CoreMedia/src/CoreMedia.c
+++ b/src/frameworks/CoreMedia/src/CoreMedia.c
@@ -19,9 +19,13 @@
 
 
 #include <CoreMedia/CoreMedia.h>
+#include <CoreFoundation/CoreFoundation.h>
 #include <stdlib.h>
 #include <stdio.h>
 
+const CFStringRef kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms = CFSTR("SampleDescriptionExtensionAtoms");
+const CFStringRef kCMSampleAttachmentKey_NotSync = CFSTR("NotSync");
+
 static int verbose = 0;
 
 __attribute__((constructor))
diff --git a/src/frameworks/CoreServices/constants.m b/src/frameworks/CoreServices/constants.m
index ba6be1a7b..e5996c8cb 100644
--- a/src/frameworks/CoreServices/constants.m
+++ b/src/frameworks/CoreServices/constants.m
@@ -32,6 +32,10 @@ const CFStringRef kUTTypeImage = CFSTR("public.image");
 const CFStringRef kUTTypeUTF8PlainText = CFSTR("public.utf8-plain-text");
 const CFStringRef kUTTypeApplication = CFSTR("com.apple.application");
 const CFStringRef kUTTypeBundle = CFSTR("com.apple.bundle");
+const CFStringRef kUTTypeHTML = CFSTR("public.html");
+const CFStringRef kUTTypePICT = CFSTR("com.apple.pict");
+const CFStringRef kUTTypeUTF16ExternalPlainText = CFSTR("public.utf16-external-plain-text");
+const CFStringRef kUTTypeUTF16PlainText = CFSTR("public.utf16-plain-text");
 
 const CFStringRef _kLSASNKey = CFSTR("LSASN");
 const CFStringRef _kLSApplicationTypeKey = CFSTR("ApplicationType");