linux-kernel - Re: [PATCH v2 05/10] media: v4l: Add definitions for MPEG2 frame format and header metadata

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Date:   Fri, 04 May 2018 10:24:03 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Tomasz Figa <tfiga@...omium.org>
Cc:     Linux Media Mailing List <linux-media@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg "
         "Roedel <joro@...tes.org>," <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-sunxi@...glegroups.com,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...tlin.com>, wens@...e.org,
        Pawel Osciak <pawel@...iak.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Arnd Bergmann <arnd@...db.de>,
        Alexandre Courbot <acourbot@...omium.org>
Subject: Re: [PATCH v2 05/10] media: v4l: Add definitions for MPEG2 frame
 format and header metadata

Hi,

On Fri, 2018-04-20 at 09:51 +0000, Tomasz Figa wrote:
> Hi Paul,
> 
> On Fri, Apr 20, 2018 at 12:46 AM Paul Kocialkowski <
> paul.kocialkowski@...tlin.com> wrote:
> [snip]
> > +struct v4l2_ctrl_mpeg2_frame_hdr {
> > +       __u32 slice_len;
> > +       __u32 slice_pos;
> > +       enum { MPEG1, MPEG2 } type;
> 
> Is enum suitable for UAPI?

As it turns out, it's not :)

> > +
> > +       __u16 width;
> > +       __u16 height;
> > +
> > +       enum { PCT_I = 1, PCT_P, PCT_B, PCT_D } picture_coding_type;
> 
> Ditto.
> 
> > +       __u8 f_code[2][2];
> > +
> > +       __u8 intra_dc_precision;
> > +       __u8 picture_structure;
> > +       __u8 top_field_first;
> > +       __u8 frame_pred_frame_dct;
> > +       __u8 concealment_motion_vectors;
> > +       __u8 q_scale_type;
> > +       __u8 intra_vlc_format;
> > +       __u8 alternate_scan;
> > +
> > +       __u8 backward_ref_index;
> > +       __u8 forward_ref_index;
> > +};
> > +
> >   #endif
> > diff --git a/include/uapi/linux/videodev2.h
> 
> b/include/uapi/linux/videodev2.h
> > index 31b5728b56e9..4b8336f7bcf0 100644
> > --- a/include/uapi/linux/videodev2.h
> > +++ b/include/uapi/linux/videodev2.h
> > @@ -635,6 +635,7 @@ struct v4l2_pix_format {
> >   #define V4L2_PIX_FMT_VC1_ANNEX_L v4l2_fourcc('V', 'C', '1', 'L')
> > /*
> 
> SMPTE 421M Annex L compliant stream */
> >   #define V4L2_PIX_FMT_VP8      v4l2_fourcc('V', 'P', '8', '0') /*
> > VP8 */
> >   #define V4L2_PIX_FMT_VP9      v4l2_fourcc('V', 'P', '9', '0') /*
> > VP9 */
> > +#define V4L2_PIX_FMT_MPEG2_FRAME v4l2_fourcc('M', 'G', '2', 'F') /*
> 
> MPEG2 frame */
> 
> >   /*  Vendor-specific formats   */
> >   #define V4L2_PIX_FMT_CPIA1    v4l2_fourcc('C', 'P', 'I', 'A') /*
> > cpia1
> 
> YUV */
> > @@ -1586,6 +1587,7 @@ struct v4l2_ext_control {
> >                  __u8 __user *p_u8;
> >                  __u16 __user *p_u16;
> >                  __u32 __user *p_u32;
> > +               struct v4l2_ctrl_mpeg2_frame_hdr __user
> 
> *p_mpeg2_frame_hdr;
> >                  void __user *ptr;
> >          };
> >   } __attribute__ ((packed));
> > @@ -1631,6 +1633,7 @@ enum v4l2_ctrl_type {
> >          V4L2_CTRL_TYPE_U8            = 0x0100,
> >          V4L2_CTRL_TYPE_U16           = 0x0101,
> >          V4L2_CTRL_TYPE_U32           = 0x0102,
> > +       V4L2_CTRL_TYPE_MPEG2_FRAME_HDR = 0x0109,
> 
> Why 0x0109?

Good catch. I see no reason in particular, so I'll probably make it
0x0103 eventually.

Cheers and thanks for the review!

-- 
Paul Kocialkowski, Bootlin (formerly Free Electrons)
Embedded Linux and kernel engineering
https://bootlin.com
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