[FFmpeg-devel] [PATCH v2] avcodec: add a get_encoder_buffer() callback to AVCodecContext

[Lynne]

Mar 12, 2021, 21:00 by jamrial at gmail.com:

> On 3/12/2021 4:42 PM, Michael Niedermayer wrote:
>
>>
>> Related to this, what do the flags passed into get_encoder_buffer() mean
>> exactly ?
>> are they "hints" so that a new/unknown flag can be ignored by an implementation
>> or what else should an application do with a unknown flag, this should
>> be clarified in the documentation
>>
>
> They are hints, same as in get_buffer2(), like with the _REF flag. They can't really be requirements since the callback should be able to ignore new flags it doesn't understand.
>

If we have something, I'd rather not have a hint for alignment, but a comment
recommending "aligned data might be faster depending on the architecture and
encoder" or something along those lines.
That way in the future we can make AVPacket->data aligned without needing
to deprecate an alignment hint here.