[FFmpeg-devel] [PATCH 1/3] avutils/hwcontext: add derive-device function which searches for existing devices in both directions

[Soft Works]

> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> On Behalf Of Mark
> Thompson
> Sent: Monday, May 2, 2022 12:01 AM
> To: ffmpeg-devel at ffmpeg.org
> Subject: Re: [FFmpeg-devel] [PATCH 1/3] avutils/hwcontext: add derive-
> device function which searches for existing devices in both directions

[..]

> > There was a reason why this can't be used. IIRC, it was that the
> > device count needs to be known at some other place where
> > av_hwdevice_iterate_types() is not available.
> >
> > Please see the previous discussion with Hendrik about this.
> 
> Where is that?  The only place I see this used is the array of derived
> devices.

Sorry, it was with Lynne, not Hendrik:

https://www.mail-archive.com/ffmpeg-devel@ffmpeg.org/msg127768.html

> Two alternative implementations without the constant spring to mind:
> 
> * A shorter array indexed by av_hwdevice_iterate_types() which would
> not have empty entries for devices not compatible with the current
> platform.
> 
> * An array of type/reference pairs.

I would prefer not to over-engineer this. Everybody else seemed to
be OK with the current approach.

Best regards,
softworkz