Re: [PATCH RFC 2/2] media: amphion: Add V4L2_FMT_FLAG_DYN_RESOLUTION for VC1L

[Nicolas Dufresne]

Hi,

Le lundi 08 juin 2026 à 12:56 +0900, Ming Qian a écrit :
> The amphion VPU decoder always emits an initial V4L2_EVENT_SOURCE_CHANGE
> event after parsing the resolution from the stream header for VC1 Annex
> L format. Without V4L2_FMT_FLAG_DYN_RESOLUTION, userspace (e.g.
> GStreamer) cannot determine that the driver will signal the initial
> resolution, causing it to skip waiting for the event and fail to set up
> the CAPTURE queue properly.
> 
> Add V4L2_FMT_FLAG_DYN_RESOLUTION to the VC1 Annex L format entry to
> indicate that the decoder will emit the source change event during
> initialization, consistent with other coded formats supported by this
> driver.
> 
> Fixes: e670f5d672ef ("media: amphion: only insert the first sequence startcode for vc1l format")
> Signed-off-by: Ming Qian <ming.qian@xxxxxxxxxxx>


Can you send a non RFC version of this.

Reviewed-by: Nicolas Dufresne <nicolas.dufresne@xxxxxxxxxxxxx>

> ---
>  drivers/media/platform/amphion/vdec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/amphion/vdec.c b/drivers/media/platform/amphion/vdec.c
> index a9f0521f2e1a..75808482d090 100644
> --- a/drivers/media/platform/amphion/vdec.c
> +++ b/drivers/media/platform/amphion/vdec.c
> @@ -136,7 +136,7 @@ static const struct vpu_format vdec_formats[] = {
>  		.mem_planes = 1,
>  		.comp_planes = 1,
>  		.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE,
> -		.flags = V4L2_FMT_FLAG_COMPRESSED
> +		.flags = V4L2_FMT_FLAG_DYN_RESOLUTION | V4L2_FMT_FLAG_COMPRESSED
>  	},
>  	{
>  		.pixfmt = V4L2_PIX_FMT_MPEG2,

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