linux-kernel - Re: [PATCH v2 1/2] drivers/media: v4l2: Add settings for Horizontal and Vertical MV Search Range

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Message-ID: <52EA00E5.10303@xs4all.nl>
Date:	Thu, 30 Jan 2014 08:36:05 +0100
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Amit Grover <amit.grover@...sung.com>
CC:	linux-media@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	kyungmin.park@...sung.com, k.debski@...sung.com,
	prabhakar.csengg@...il.com, s.nawrocki@...sung.com,
	hans.verkuil@...co.com, swaminath.p@...sung.com,
	jtp.park@...sung.com, Rrob@...dley.net, andrew.smirnov@...il.com,
	anatol.pomozov@...il.com, jmccrohan@...il.com, joe@...ches.com,
	awalls@...metrocast.net, arun.kk@...sung.com,
	austin.lobo@...sung.com
Subject: Re: [PATCH v2 1/2] drivers/media: v4l2: Add settings for Horizontal
 and Vertical MV Search Range

On 01/30/2014 06:42 AM, Amit Grover wrote:
> Adding V4L2 controls for horizontal and vertical search range in pixels
> for motion estimation module in video encoder.
> 
> Signed-off-by: Swami Nathan <swaminath.p@...sung.com>
> Signed-off-by: Amit Grover <amit.grover@...sung.com>
> ---
>  Documentation/DocBook/media/v4l/controls.xml |   20 ++++++++++++++++++++
>  drivers/media/v4l2-core/v4l2-ctrls.c         |   14 ++++++++++++++
>  include/uapi/linux/v4l2-controls.h           |    2 ++
>  3 files changed, 36 insertions(+)
> 
> diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml
> index 7a3b49b..be04d18 100644
> --- a/Documentation/DocBook/media/v4l/controls.xml
> +++ b/Documentation/DocBook/media/v4l/controls.xml
> @@ -2258,6 +2258,26 @@ Applicable to the MPEG1, MPEG2, MPEG4 encoders.</entry>
>  VBV buffer control.</entry>
>  	      </row>
>  
> +		  <row><entry></entry></row>
> +	      <row id=""v4l2-mpeg-video-hor-search-range">
> +		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE</constant>&nbsp;</entry>
> +		<entry>integer</entry>
> +	      </row>
> +		<row><entry spanname="descr">Horizontal search range defines maximum horizontal search area in pixels
> +to search and match for the present Macroblock (MB) in the reference picture. This V4L2 control macro is used to set
> +horizontal search range for motion estimation module in video encoder.</entry>
> +	      </row>
> +
> +		 <row><entry></entry></row>
> +	      <row id="v4l2-mpeg-video-vert-search-range">
> +		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE</constant>&nbsp;</entry>
> +		<entry>integer</entry>

These two controls sound very mfc specific as opposed to being part of the standard.
If so, then they should be named V4L2_CID_MPEG_MFC51_*. Also, for which codecs are
these controls applicable?

> +	      </row>
> +		<row><entry spanname="descr">Vertical search range defines maximum vertical search area in pixels
> +to search and match for the present Macroblock (MB) in the reference picture. This V4L2 control macro is used to set
> +vertical search range for motion estimation module in video encoder.</entry>
> +	      </row>
> +
>  	      <row><entry></entry></row>
>  	      <row>
>  		<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE</constant>&nbsp;</entry>
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index fb46790..e775388 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -735,6 +735,8 @@ const char *v4l2_ctrl_get_name(u32 id)
>  	case V4L2_CID_MPEG_VIDEO_DEC_PTS:			return "Video Decoder PTS";
>  	case V4L2_CID_MPEG_VIDEO_DEC_FRAME:			return "Video Decoder Frame Count";
>  	case V4L2_CID_MPEG_VIDEO_VBV_DELAY:			return "Initial Delay for VBV Control";
> +	case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:		return "Horizontal MV Search Range";
> +	case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:		return "Vertical MV Search Range";
>  	case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:		return "Repeat Sequence Header";
>  
>  	/* VPX controls */
> @@ -905,6 +907,18 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
>  		*min = 0;
>  		*max = *step = 1;
>  		break;
> +	case V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE:
> +		*type = V4L2_CTRL_TYPE_INTEGER;
> +		*min = 16;
> +		*max = 128;
> +		*step = 16;

Weird range, why not use range 1-8?

> +		break;
> +	case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:
> +		*type = V4L2_CTRL_TYPE_INTEGER;
> +		*min = 16;
> +		*max = 128;
> +		*step = 16;
> +		break;
>  	case V4L2_CID_PAN_RESET:
>  	case V4L2_CID_TILT_RESET:
>  	case V4L2_CID_FLASH_STROBE:
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index 1666aab..80e1def 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -372,6 +372,8 @@ enum v4l2_mpeg_video_multi_slice_mode {
>  #define V4L2_CID_MPEG_VIDEO_DEC_FRAME			(V4L2_CID_MPEG_BASE+224)
>  #define V4L2_CID_MPEG_VIDEO_VBV_DELAY			(V4L2_CID_MPEG_BASE+225)
>  #define V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER		(V4L2_CID_MPEG_BASE+226)
> +#define V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE		(V4L2_CID_MPEG_BASE+227)
> +#define V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE		(V4L2_CID_MPEG_BASE+228)
>  
>  #define V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP		(V4L2_CID_MPEG_BASE+300)
>  #define V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP		(V4L2_CID_MPEG_BASE+301)
> 

Regards,

	Hans
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