linux-kernel - Re: [PATCH v6 07/11] media: cedrus: Specify H264 startcode and decoding mode

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Message-ID: <4708223638fb8aa6214a58cb9a05c525625020cf.camel@collabora.com>
Date:   Fri, 16 Aug 2019 09:32:07 -0300
From:   Ezequiel Garcia <ezequiel@...labora.com>
To:     Hans Verkuil <hverkuil@...all.nl>, linux-media@...r.kernel.org
Cc:     kernel@...labora.com,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Tomasz Figa <tfiga@...omium.org>,
        linux-rockchip@...ts.infradead.org,
        Heiko Stuebner <heiko@...ech.de>,
        Jonas Karlman <jonas@...boo.se>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Alexandre Courbot <acourbot@...omium.org>,
        fbuergisser@...omium.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 07/11] media: cedrus: Specify H264 startcode and
 decoding mode

On Fri, 2019-08-16 at 09:38 +0200, Hans Verkuil wrote:
> On 8/14/19 9:59 PM, Ezequiel Garcia wrote:
> > The cedrus VPU is slice-based and expects V4L2_PIX_FMT_H264_SLICE
> > buffers to contain H264 slices with no start code.
> > 
> > Expose this to userspace with the newly added menu control.
> > 
> > These two controls are specified as mandatory for applications,
> > but we mark them as non-required on the driver side for
> > backwards compatibility.
> > 
> > Signed-off-by: Ezequiel Garcia <ezequiel@...labora.com>
> > ---
> > Changes in v6:
> > * Adjust to control renames.
> > Changes in v5:
> > * Clarify commit log.
> > Changes in v4:
> > * New patch.
> > ---
> >  drivers/staging/media/sunxi/cedrus/cedrus.c | 20 ++++++++++++++++++++
> >  1 file changed, 20 insertions(+)
> > 
> > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.c b/drivers/staging/media/sunxi/cedrus/cedrus.c
> > index 7bdc413bf727..69a836aa11ef 100644
> > --- a/drivers/staging/media/sunxi/cedrus/cedrus.c
> > +++ b/drivers/staging/media/sunxi/cedrus/cedrus.c
> > @@ -77,6 +77,26 @@ static const struct cedrus_control cedrus_controls[] = {
> >  		.codec		= CEDRUS_CODEC_H264,
> >  		.required	= true,
> >  	},
> > +	{
> > +		.cfg = {
> > +			.id	= V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE,
> > +			.max	= V4L2_MPEG_VIDEO_H264_DECODE_MODE_SLICE_BASED,
> > +			.def	= V4L2_MPEG_VIDEO_H264_DECODE_MODE_SLICE_BASED,
> > +			.menu_skip_mask = BIT(V4L2_MPEG_VIDEO_H264_DECODE_MODE_FRAME_BASED),
> 
> You don't need this: DECODE_MODE_FRAME_BASED > DECODE_MODE_SLICE_BASED (the max
> value). So no need to set the skip_mask since it is out of range.
> 
> > +		},
> > +		.codec		= CEDRUS_CODEC_H264,
> > +		.required	= false,
> > +	},
> > +	{
> > +		.cfg = {
> > +			.id	= V4L2_CID_MPEG_VIDEO_H264_START_CODE,
> > +			.max	= V4L2_MPEG_VIDEO_H264_START_CODE_NONE,
> > +			.def	= V4L2_MPEG_VIDEO_H264_START_CODE_NONE,
> > +			.menu_skip_mask = BIT(V4L2_MPEG_VIDEO_H264_START_CODE_ANNEX_B),
> 
> Ditto.
> 

I see.

I'll fix this.

> Regards,
> 
> 	Hans
> 
> > +		},
> > +		.codec		= CEDRUS_CODEC_H264,
> > +		.required	= false,
> > +	},
> >  };
> >  
> >  #define CEDRUS_CONTROLS_COUNT	ARRAY_SIZE(cedrus_controls)
> >