[FFmpeg-devel] [PATCH 07/29] lavc: add a decoder option for configuring side data preference

[Derek Buitenhuis]

On 3/4/2024 1:06 PM, Anton Khirnov wrote:
> +    /**
> +     * Decoding only. May be set by the caller before avcodec_open2() to an
> +     * av_malloc()'ed array (or via AVOptions). Owned and freed by the decoder
> +     * afterwards.
> +     *
> +     * By default, when some side data type is present both in global
> +     * user-supplied coded_side_data and inside the coded bitstream, avcodec
> +     * will propagate the latter to the decoded frame.
> +     *
> +     * This array contains a list of AVPacketSideDataType for which this
> +     * preference should be switched, i.e. avcodec will prefer global side data
> +     * over those in stored in the bytestream. It may also contain a single -1,
> +     * in which case the preference is switched for all side data types.
> +     */
> +    int        *side_data_prefer_global;

My only comment is that it would be nice to include some text about what the practical
application of this option is, rather than just technical details. Something like:

    This can be useful, when, for example, input contains data in both the container
    and bitstream.

- Derek