[FFmpeg-cvslog] lavfi/metal: fix build on pre-10.15 SDKs

[rcombs]

ffmpeg | branch: master | rcombs <rcombs at rcombs.me> | Tue Dec 21 02:37:10 2021 -0600| [0f77ee9d97a9a9ed56da59a192acc616f574b932] | committer: rcombs

lavfi/metal: fix build on pre-10.15 SDKs

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0f77ee9d97a9a9ed56da59a192acc616f574b932
---

 libavfilter/metal/utils.m | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavfilter/metal/utils.m b/libavfilter/metal/utils.m
index f831502065..f365d3ceea 100644
--- a/libavfilter/metal/utils.m
+++ b/libavfilter/metal/utils.m
@@ -29,6 +29,8 @@ void ff_metal_compute_encoder_dispatch(id<MTLDevice> device,
     NSUInteger h = pipeline.maxTotalThreadsPerThreadgroup / w;
     MTLSize threadsPerThreadgroup = MTLSizeMake(w, h, 1);
     BOOL fallback = YES;
+    // MAC_OS_X_VERSION_10_15 is only defined on SDKs new enough to include its functionality (including iOS, tvOS, etc)
+#ifdef MAC_OS_X_VERSION_10_15
     if (@available(macOS 10.15, iOS 11, tvOS 14.5, *)) {
         if ([device supportsFamily:MTLGPUFamilyCommon3]) {
             MTLSize threadsPerGrid = MTLSizeMake(width, height, 1);
@@ -36,6 +38,7 @@ void ff_metal_compute_encoder_dispatch(id<MTLDevice> device,
             fallback = NO;
         }
     }
+#endif
     if (fallback) {
         MTLSize threadgroups = MTLSizeMake((width + w - 1) / w,
                                            (height + h - 1) / h,