[FFmpeg-devel] [PATCH v6 1/3] avcodec: add flags for packets with top/bottom field

Patrick Keroulas patrick.keroulas at savoirfairelinux.com
Wed May 23 00:19:35 EEST 2018

----- Original Message -----
> From: "Rostislav Pehlivanov" <atomnuker at gmail.com>
> To: "FFmpeg development discussions and patches" <ffmpeg-devel at ffmpeg.org>
> Sent: Friday, May 18, 2018 5:28:42 PM
> Subject: Re: [FFmpeg-devel] [PATCH v6 1/3] avcodec: add flags for packets with top/bottom field

> On 18 May 2018 at 22:17, wm4 <nfxjfg at googlemail.com> wrote:

> > But I think a new side data type would be much saner. We could even
> > just make it something generic, like AV_PKT_DATA_ANCILLARY or
> > something. It's apparently just packet data which somehow couldn't go
> > into the packet data.

> I agree, a generic ancillary side data type sounds better. It would have to
> be handled the same way as mastering metadata (e.g. to allocate it you'd
> need to use a separate function), since the size of the data struct can't
> be part of the API if we intend to add fields later.
> Patrick, if you're okay with that you should submit a patch which bases
> such side data on libavutil/mastering_display_metadata.h/.c

No problem for transmitting field flags through side data. But the given
example (libavutil/mastering_display_metadata.h/.c) attaches data to
AVFrame, not AVPacket, so I'm not sure where to place this separate
allocator function. Do you recommend to create a new 
libavcodec/ancillary.c/h utility?

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