> -----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.
softworkz
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