linux-kernel - Re: [Patch v6 05/12] [media] videodev2.h: Add v4l2 definition for HEVC

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Date:   Fri, 08 Dec 2017 10:47:24 -0500
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Smitha T Murthy <smitha.t@...sung.com>,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     kyungmin.park@...sung.com, kamil@...as.org, jtp.park@...sung.com,
        a.hajda@...sung.com, mchehab@...nel.org, pankaj.dubey@...sung.com,
        krzk@...nel.org, m.szyprowski@...sung.com, s.nawrocki@...sung.com
Subject: Re: [Patch v6 05/12] [media] videodev2.h: Add v4l2 definition for
 HEVC

Le vendredi 08 décembre 2017 à 14:38 +0530, Smitha T Murthy a écrit :
> Add V4L2 definition for HEVC compressed format
> 
> Signed-off-by: Smitha T Murthy <smitha.t@...sung.com>
> Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>
> Reviewed-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
> Acked-by: Hans Verkuil <hans.verkuil@...co.com>
> ---
>  include/uapi/linux/videodev2.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 185d6a0..bd9b5d5 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -634,6 +634,7 @@ 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_HEVC     v4l2_fourcc('H', 'E', 'V', 'C') /* HEVC aka H.265 */

Wouldn't it be more consistent to call it V4L2_PIX_FMT_H265 as we have
used H264 for the previous generation, or is there a formal rationale ?
Also, this is byte-stream right ? With start codes ?

>  
>  /*  Vendor-specific formats   */
>  #define V4L2_PIX_FMT_CPIA1    v4l2_fourcc('C', 'P', 'I', 'A') /* cpia1 YUV */
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