[FFmpeg-devel] [PATCH] Support limiting the number of pixels per image

[Paul B Mahol]

On 12/9/16, Michael Niedermayer <michael at niedermayer.cc> wrote:
> Adds av_image_check_size2() with max_pixels and pix_fmt parameters.
> pix_fmt is unused and is added to avoid a 2nd API change later
>
> The old function uses AVOptions to obtain the max_pixels value to simplify
> the transition.
>
> TODO: split into 2 patches (one per lib), docs & bump
>
> This allows preventing some OOM and "slow decoding" cases by limiting the
> maximum resolution
> this may be useful to avoid fuzzers getting stuck in boring cases
>
> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> ---
>  libavcodec/avcodec.h                 |  8 ++++++++
>  libavcodec/options_table.h           |  1 +
>  libavutil/imgutils.c                 | 31 ++++++++++++++++++++++++++-----
>  libavutil/imgutils.h                 | 14 ++++++++++++++
>  tests/ref/fate/api-mjpeg-codec-param |  2 ++
>  tests/ref/fate/api-png-codec-param   |  2 ++
>  6 files changed, 53 insertions(+), 5 deletions(-)
>
> diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
> index 7ac2adaf66..81052b10ef 100644
> --- a/libavcodec/avcodec.h
> +++ b/libavcodec/avcodec.h
> @@ -3570,6 +3570,14 @@ typedef struct AVCodecContext {
>       */
>      int trailing_padding;
>
> +    /**
> +     * The number of pixels per image to maximally accept.
> +     *
> +     * - decoding: set by user
> +     * - encoding: unused
> +     */
> +    int max_pixels;

int64_t please