[FFmpeg-cvslog] avfoundation: Fix building on iOS

[Martin Storsjö]

ffmpeg | branch: master | Martin Storsjö <martin at martin.st> | Thu Apr 30 13:34:13 2020 +0300| [c810a9502cebe32e1dd08ee3d0d17053dde44aa9] | committer: Thilo Borgmann

avfoundation: Fix building on iOS

Apparently the changes from 3c9185bf3a83395d12a987f626dbdb985eac4320
aren't enough; even with that in place, I got errors like this
when trying to build for iOS:

src/libavdevice/avfoundation.m:135:5: error:
      'AVCaptureDeviceTransportControlsPlaybackMode' is unavailable: not
      available on iOS
    AVCaptureDeviceTransportControlsPlaybackMode observed_mode;
    ^

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c810a9502cebe32e1dd08ee3d0d17053dde44aa9
---

 libavdevice/avfoundation.m | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavdevice/avfoundation.m b/libavdevice/avfoundation.m
index 0b1888693f..59d5b0af4f 100644
--- a/libavdevice/avfoundation.m
+++ b/libavdevice/avfoundation.m
@@ -132,7 +132,9 @@ typedef struct
     CMSampleBufferRef         current_audio_frame;
 
     AVCaptureDevice          *observed_device;
+#if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
     AVCaptureDeviceTransportControlsPlaybackMode observed_mode;
+#endif
     int                      observed_quit;
 } AVFContext;
 
@@ -200,6 +202,7 @@ static void unlock_frames(AVFContext* ctx)
                         change:(NSDictionary *)change
                        context:(void *)context {
     if (context == _context) {
+#if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
         AVCaptureDeviceTransportControlsPlaybackMode mode =
             [change[NSKeyValueChangeNewKey] integerValue];
 
@@ -209,6 +212,7 @@ static void unlock_frames(AVFContext* ctx)
             }
             _context->observed_mode = mode;
         }
+#endif
     } else {
         [super observeValueForKeyPath: keyPath
                              ofObject: object