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new 215351c1c3 avdevice/decklink: fix build on macOS by defining
IID_IUnknown
215351c1c3 is described below
commit 215351c1c37dc0345a6794f4c96af54cf30e1c7b
Author: Jake Fineman <[email protected]>
AuthorDate: Mon Oct 26 22:39:23 2026 -0400
Commit: Kacper Michajłow <[email protected]>
CommitDate: Tue Oct 27 18:06:45 2026 +0000
avdevice/decklink: fix build on macOS by defining IID_IUnknown
Commits 0cd75dbfa0 and 27e94281d1 added QueryInterface()
implementations that compare the requested interface against
IID_IUnknown. The Linux SDK defines it in LinuxCOM.h and the Windows
SDK gets it from the platform COM headers, but the macOS SDK uses
CoreFoundation's COM types from <CoreFoundation/CFPlugInCOM.h>, which
only provide IUnknownUUID as a CFUUIDRef. Since then, building with
--enable-decklink on macOS fails:
libavdevice/decklink_dec.cpp:138:43: error: use of undeclared
identifier 'IID_IUnknown'
libavdevice/decklink_dec.cpp:603:43: error: use of undeclared
identifier 'IID_IUnknown'
libavdevice/decklink_enc.cpp:120:39: error: use of undeclared
identifier 'IID_IUnknown'
libavdevice/decklink_enc.cpp:181:39: error: use of undeclared
identifier 'IID_IUnknown'
On macOS, REFIID is CFUUIDBytes, so derive IID_IUnknown from
IUnknownUUID with CFUUIDGetUUIDBytes(), the same definition used by
the macOS samples shipped with the DeckLink SDK. This avoids
duplicating the GUID bytes, and CFUUIDGetConstantUUIDWithBytes()
returns a constant that must not be released. The definition is
limited to __APPLE__, so Linux and Windows builds are unchanged.
Tested with DeckLink SDK 16.0 and Apple clang 21 on macOS arm64.
Signed-off-by: Jake Fineman <[email protected]>
---
libavdevice/decklink_common.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavdevice/decklink_common.h b/libavdevice/decklink_common.h
index 11430787ce..bd0f59dc5e 100644
--- a/libavdevice/decklink_common.h
+++ b/libavdevice/decklink_common.h
@@ -103,6 +103,11 @@ static inline bool DECKLINK_IsEqualIID(const REFIID&
riid1, const REFIID& riid2)
}
#endif
+#ifdef __APPLE__
+/* The macOS SDK only provides IUnknownUUID. */
+#define IID_IUnknown CFUUIDGetUUIDBytes(IUnknownUUID)
+#endif
+
class decklink_output_callback;
class decklink_input_callback;
--
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