Re: [FFmpeg-devel] [PATCH 2/3] avfilter/vf_hwmap: get the AVHWDeviceType from outlink format

["Wu, Tong1" <tong1.wu-at-intel.com@ffmpeg.org>]

> > On Jun 29, 2022, at 2:32 PM, Tong Wu <tong1.wu-at-intel.com@ffmpeg.org>
> wrote:
> >
> > When a derive_device_type is not specified, the hwmap filter should be
> > able to retrieve AVHWDeviceType from outlink->format and create
> > corresponding hwdevice context.
> >
> > Signed-off-by: Tong Wu <tong1.wu@intel.com>
> > ---
> > libavfilter/vf_hwmap.c | 26 +++++++++++++++++---------
> > 1 file changed, 17 insertions(+), 9 deletions(-)
> >
> > diff --git a/libavfilter/vf_hwmap.c b/libavfilter/vf_hwmap.c index
> > 2e03dfc1fe..a0c2e134cf 100644
> > --- a/libavfilter/vf_hwmap.c
> > +++ b/libavfilter/vf_hwmap.c
> > @@ -72,26 +72,34 @@ static int hwmap_config_output(AVFilterLink
> *outlink)
> >     if (inlink->hw_frames_ctx) {
> >         hwfc = (AVHWFramesContext*)inlink->hw_frames_ctx->data;
> >
> > -        if (ctx->derive_device_type) {
> > -            enum AVHWDeviceType type;
> > +        enum AVHWDeviceType type;
> 
> mixed declarations and code.
> 
> >
> > +        if (ctx->derive_device_type) {
> >             type = av_hwdevice_find_type_by_name(ctx->derive_device_type);
> >             if (type == AV_HWDEVICE_TYPE_NONE) {
> >                 av_log(avctx, AV_LOG_ERROR, "Invalid device type.\n");
> >                 err = AVERROR(EINVAL);
> >                 goto fail;
> >             }
> > -
> > -            err = av_hwdevice_ctx_create_derived(&device, type,
> > -                                                 hwfc->device_ref, 0);
> > -            if (err < 0) {
> > -                av_log(avctx, AV_LOG_ERROR, "Failed to created derived "
> > -                       "device context: %d.\n", err);
> > +        } else {
> > +            type = av_hwdevice_get_type_by_pix_fmt(outlink->format);
> > +            if (type == AV_HWDEVICE_TYPE_NONE) {
> > +                av_log(avctx, AV_LOG_ERROR, "Could not get device type from "
> > +                       "format %s.\n", av_get_pix_fmt_name(outlink->format));
> > +                err = AVERROR(EINVAL);
> >                 goto fail;
> >             }
> > -            device_is_derived = 1;
> >         }
> >
> > +        err = av_hwdevice_ctx_create_derived(&device, type,
> > +                                             hwfc->device_ref, 0);
> 
> I think a new device should be created only if
> 
> if (device == NULL || ctx->derive_device_type != NULL)
> 
> Now a new device is created unconditionally.

Thanks a lot for the review. That makes sense. Will update them in v2.

> 
> > +        if (err < 0) {
> > +            av_log(avctx, AV_LOG_ERROR, "Failed to created derived "
> > +                   "device context: %d.\n", err);
> > +            goto fail;
> > +        }
> > +        device_is_derived = 1;
> > +
> >         desc = av_pix_fmt_desc_get(outlink->format);
> >         if (!desc) {
> >             err = AVERROR(EINVAL);
> > --
> > 2.35.1.windows.2
> >
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> >
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