guard VTIsHardwareDecodeSupported()

Author: blueboxd

media/gpu/mac/video_toolbox_video_decoder.cc

@@ -42,9 +42,12 @@ namespace media {
 namespace {
 
 bool SupportsH264() {
-  return VTIsHardwareDecodeSupported(kCMVideoCodecType_H264);
+  if (__builtin_available(macOS 10.13, *)) {
+    return VTIsHardwareDecodeSupported(kCMVideoCodecType_H264);
+  } else {
+    return false;
+  }
 }
-
 bool InitializeVP9() {
 #if BUILDFLAG(IS_MAC)
   // TODO(crbug.com/1449877): Enable VP9 on iOS.
@@ -62,7 +65,11 @@ bool SupportsVP9() {
 }
 
 bool SupportsAV1() {
-  return VTIsHardwareDecodeSupported(kCMVideoCodecType_AV1);
+  if (__builtin_available(macOS 10.13, *)) {
+    return VTIsHardwareDecodeSupported(kCMVideoCodecType_AV1);
+  } else {
+    return false;
+  }
 }
 
 #if BUILDFLAG(ENABLE_HEVC_PARSER_AND_HW_DECODER)

media/gpu/mac/vt_video_decode_accelerator_mac.mm

@@ -2513,8 +2513,10 @@ Picture picture(picture_id, frame.bitstream_id, gfx::Rect(frame.image_size),
       if (!base::FeatureList::IsEnabled(kVideoToolboxAv1Decoding)) {
         continue;
       }
-      if (!VTIsHardwareDecodeSupported(kCMVideoCodecType_AV1)) {
-        continue;
+      if (__builtin_available(macOS 10.13, *)) {
+        if (!VTIsHardwareDecodeSupported(kCMVideoCodecType_AV1)) {
+          continue;
+        }
       }
 
       // Success! We have AV1 hardware decoding support.