[FFmpeg-devel] [PATCH] videotoolbox: Add SDK ifdefs for use of kVTVideoDecoderReferenceMissingErr

[Zhao Zhili]

> 在 2025年3月25日，下午6:01，Martin Storsjö <martin at martin.st> 写道：
> 
> This error constant was only added in the macOS 12 and iOS 15
> SDKs.
> 
> If building with an older SDK, assume that the error doesn't
> match this constant.
> 
> This fixes build errors with older SDKs after
> c6214b0d691566c7cb0f2ff5be08a24c3534e5bb.
> 
> As this constant is declared unconditionally (without any target
> version guards) in the headers, one can't reproduce this issue
> while building with a newer SDK and targeting an older version
> with -mmacosx-version-min=.
> 
> Technically, checking just one of MAC_OS_VERSION_12_0 and
> __IPHONE_15_0 is enough; the macOS SDKs and iOS SDKs share these
> files, so files from a similar point in time do have the same
> defines. Therefore, we don't really need to expand this with
> checks for tvOS, watchOS and other OS variants.
> ---
> libavcodec/videotoolbox.c | 5 +++++
> 1 file changed, 5 insertions(+)
> 
> diff --git a/libavcodec/videotoolbox.c b/libavcodec/videotoolbox.c
> index aaa6129576..7f7b910b26 100644
> --- a/libavcodec/videotoolbox.c
> +++ b/libavcodec/videotoolbox.c
> @@ -728,8 +728,13 @@ static void videotoolbox_decoder_callback(void *opaque,
>     }
> 
>     if (!image_buffer) {
> +#if defined(MAC_OS_VERSION_12_0) || defined(__IPHONE_15_0)
> +        // kVTVideoDecoderReferenceMissingErr was defined in the macOS 12/iOS 15 SDK
>         if (status != kVTVideoDecoderReferenceMissingErr)
>             vtctx->reconfig_needed = true;
> +#else
> +        vtctx->reconfig_needed = true;
> +#endif

I used its numeric value initially, but after checking the doc,

kVTVideoDecoderReferenceMissingErr
iOS 6.0+
iPadOS 6.0+
Mac Catalyst 13.0+
macOS 10.8+
tvOS 10.2+
visionOS 1.0+













I replaced it with the enum.

Now I wondering what does this macOS 10.8 mean.

Anyway, can we use the numeric value here?

> 
>         av_log(vtctx->logctx, status ? AV_LOG_WARNING : AV_LOG_DEBUG,
>                "vt decoder cb: output image buffer is null: %i, reconfig %d\n",
> --
> 2.39.5 (Apple Git-154)
> 
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