Re: [FFmpeg-devel] [PATCH v4 05/13] avutil/frame: split side data removal out to non-AVFrame function

[Leo Izen <leo.izen@gmail.com>]

On 9/1/23 16:38, Jan Ekström wrote:
> This will make it possible to reuse logic in further commits.
> ---
>   libavutil/frame.c | 24 ++++++++++++++++--------
>   1 file changed, 16 insertions(+), 8 deletions(-)
> 
> diff --git a/libavutil/frame.c b/libavutil/frame.c
> index 9eff851d64..0b1a8e5244 100644
> --- a/libavutil/frame.c
> +++ b/libavutil/frame.c
> @@ -95,6 +95,21 @@ void av_frame_side_data_set_uninit(AVFrameSideDataSet *set)
>       wipe_side_data(&set->sd, &set->nb_sd);
>   }
>   
> +static void remove_side_data(AVFrameSideData ***sd, int *nb_side_data,
> +                             const enum AVFrameSideDataType type)
> +{
> +    for (int i = *nb_side_data - 1; i >= 0; i--) {
> +        AVFrameSideData *entry = ((*sd)[i]);
> +        if (entry->type != type)
> +            continue;
> +
> +        free_side_data(&entry);
> +
> +        ((*sd)[i]) = ((*sd)[*nb_side_data - 1]);
> +        (*nb_side_data)--;
> +    }
> +}
> +

Do we need AVFrameSideData ***sd here? It looks like **sd will suffice, 
as sd[i] = foo will still modify the original.


>   AVFrame *av_frame_alloc(void)
>   {
>       AVFrame *frame = av_malloc(sizeof(*frame));
> @@ -945,14 +960,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
>   
>   void av_frame_remove_side_data(AVFrame *frame, enum AVFrameSideDataType type)
>   {
> -    for (int i = frame->nb_side_data - 1; i >= 0; i--) {
> -        AVFrameSideData *sd = frame->side_data[i];
> -        if (sd->type == type) {
> -            free_side_data(&frame->side_data[i]);
> -            frame->side_data[i] = frame->side_data[frame->nb_side_data - 1];
> -            frame->nb_side_data--;
> -        }
> -    }
> +    remove_side_data(&frame->side_data, &frame->nb_side_data, type);
>   }
>   
>   const char *av_frame_side_data_name(enum AVFrameSideDataType type)
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