linux-kernel - Re: [PATCH 2/3] media: cedrus: h264: Properly configure reference field

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Date:   Fri, 05 Jun 2020 19:26:20 +0200
From:   Jernej Škrabec <jernej.skrabec@...l.net>
To:     paul.kocialkowski@...tlin.com, mripard@...nel.org,
        Nicolas Dufresne <nicolas@...fresne.ca>
Cc:     mchehab@...nel.org, wens@...e.org, hverkuil-cisco@...all.nl,
        gregkh@...uxfoundation.org, jonas@...boo.se,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/3] media: cedrus: h264: Properly configure reference field

Dne petek, 05. junij 2020 ob 19:16:35 CEST je Nicolas Dufresne napisal(a):
> Le jeudi 04 juin 2020 à 20:57 +0200, Jernej Skrabec a écrit :
> > When interlaced H264 content is being decoded, references must indicate
> > which field is being referenced. Currently this was done by checking
> > capture buffer flags. However, that is not correct because capture
> > buffer may hold both fields.
> > 
> > Fix this by checking newly introduced flags in reference lists.
> > 
> > Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> 
> Perhaps an additional patch could cleanup the miss-leading comment in
> v4l2_h264_dpb_entry definition.

I missed that. I think this change actually belongs to patch 1. I'll fix it in 
v2.

Best regards,
Jernej

> 
> Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
> 
> > ---
> > 
> >  drivers/staging/media/sunxi/cedrus/cedrus_h264.c | 6 ++----
> >  1 file changed, 2 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> > b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c index
> > cce527bbdf86..c87717d17ec5 100644
> > --- a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> > +++ b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> > @@ -183,7 +183,6 @@ static void _cedrus_write_ref_list(struct cedrus_ctx
> > *ctx,> 
> >  	for (i = 0; i < num_ref; i++) {
> >  	
> >  		const struct v4l2_h264_dpb_entry *dpb;
> >  		const struct cedrus_buffer *cedrus_buf;
> > 
> > -		const struct vb2_v4l2_buffer *ref_buf;
> > 
> >  		unsigned int position;
> >  		int buf_idx;
> >  		u8 dpb_idx;
> > 
> > @@ -198,12 +197,11 @@ static void _cedrus_write_ref_list(struct cedrus_ctx
> > *ctx,> 
> >  		if (buf_idx < 0)
> >  		
> >  			continue;
> > 
> > -		ref_buf = to_vb2_v4l2_buffer(cap_q->bufs[buf_idx]);
> > -		cedrus_buf = vb2_v4l2_to_cedrus_buffer(ref_buf);
> > +		cedrus_buf = vb2_to_cedrus_buffer(cap_q->bufs[buf_idx]);
> > 
> >  		position = cedrus_buf->codec.h264.position;
> >  		
> >  		sram_array[i] |= position << 1;
> > 
> > -		if (ref_buf->field == V4L2_FIELD_BOTTOM)
> > +		if (ref_list[i].flags & 
V4L2_H264_REFERENCE_FLAG_BOTTOM_FIELD)
> > 
> >  			sram_array[i] |= BIT(0);
> >  	
> >  	}