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

["zhilizhao(赵志立)"]

> On Jun 29, 2022, at 2:32 PM, Tong Wu <tong1.wu-at-intel.com at 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 at 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.

> +        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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