[FFmpeg-devel] [PATCH] lavc/videotoolboxenc.c: Fix the trc support for iec61966-2-1 (sRGB)

[Rick Kern]

On Thu, Jul 15, 2021 at 12:47 AM Hao Guan <hguandl at gmail.com> wrote:

> ---
>  libavcodec/videotoolboxenc.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/libavcodec/videotoolboxenc.c b/libavcodec/videotoolboxenc.c
> index 4eaabed5d8..61eb6e1921 100644
> --- a/libavcodec/videotoolboxenc.c
> +++ b/libavcodec/videotoolboxenc.c
> @@ -990,6 +990,10 @@ static int get_cv_transfer_function(AVCodecContext
> *avctx,
>              *gamma_level = CFNumberCreate(NULL, kCFNumberFloat32Type,
> &gamma);
>              break;
>
> +        case AVCOL_TRC_IEC61966_2_1:
> +            *transfer_fnc = kCVImageBufferTransferFunction_sRGB;
> +            break;
> +
>
kCVImageBufferTransferFunction_sRGB is only available starting in iOS 11
and MacOS 10.13, so this will cause a build error for old OS's. This should
be added to compat_keys and accessed from there.

         case AVCOL_TRC_BT2020_10:
>          case AVCOL_TRC_BT2020_12:
>              *transfer_fnc =
> compat_keys.kCVImageBufferTransferFunction_ITU_R_2020;
> --
> 2.30.1 (Apple Git-130)
>
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