Quoting Soft Works (2021-11-25 18:02:54)
>
>
> > -----Original Message-----
> > From: ffmpeg-devel <ffmpeg-devel-boun...@ffmpeg.org> On Behalf Of Anton
> > Khirnov
> > Sent: Thursday, November 25, 2021 5:40 PM
> > To: ffmpeg-devel@ffmpeg.org
> > Subject: Re: [FFmpeg-devel] [PATCH v4 1/1] avutils/hwcontext: When deriving
> > a
> > hwdevice, search for existing device in both directions
> >
> > Quoting Soft Works (2021-11-25 03:41:32)
> > > @@ -687,6 +720,11 @@ int av_hwdevice_ctx_create_derived_opts(AVBufferRef
> > **dst_ref_ptr,
> > > ret = AVERROR(ENOMEM);
> > > goto fail;
> > > }
> > > + tmp_ctx->internal->derived_devices[type] =
> > av_buffer_ref(dst_ref);
> > > + if (!tmp_ctx->internal->derived_devices[type]) {
> > > + ret = AVERROR(ENOMEM);
> > > + goto fail;
> > > + }
> >
> > This means that once you derive a device of a certain type, you can
> > never truly close it without also killing the parent device. That
> > strikes me as
> > - potentially troublesome
> > - a behavior change
> >
> > Also, I don't see it as completely obvious that all derivations should
> > always return the same child instance.
>
>
> It creates the behavior that everybody wants and expects who is working
> with HW devices derivation.
What qualifies you to speak for "everybody"? I would expect to hear some
practical arguments for such a strong claim.
--
Anton Khirnov
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