Re: [PATCH] New V4L2 ioctls for OMAP class of Devices

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On Sunday 25 January 2009 10:35:49 Hans Verkuil wrote:
> On Saturday 24 January 2009 18:03:51 Shah, Hardik wrote:
> > > -----Original Message-----
> > > From: Shah, Hardik
> > > Sent: Wednesday, January 21, 2009 5:24 PM
> > > To: video4linux-list@xxxxxxxxxx; linux-media@xxxxxxxxxxxxxxx
> > > Cc: Shah, Hardik; Jadav, Brijesh R; Nagalla, Hari; Hadli, Manjunath;
> > > R, Sivaraj; Hiremath, Vaibhav
> > > Subject: [PATCH] New V4L2 ioctls for OMAP class of Devices
> > >
> > > 1.  Control ID added for rotation.  Same as HFLIP.
> > > 2.  Control ID added for setting background color on
> > >     output device.
> > > 3.  New ioctl added for setting the color space conversion from
> > >     YUV to RGB.
> > >
> > > Signed-off-by: Brijesh Jadav <brijesh.j@xxxxxx>
> > > Signed-off-by: Hari Nagalla <hnagalla@xxxxxx>
> > > Signed-off-by: Hardik Shah <hardik.shah@xxxxxx>
> > > Signed-off-by: Manjunath Hadli <mrh@xxxxxx>
> > > Signed-off-by: R Sivaraj <sivaraj@xxxxxx>
> > > Signed-off-by: Vaibhav Hiremath <hvaibhav@xxxxxx>
> > > ---
> > >  linux/drivers/media/video/v4l2-ioctl.c |   19 ++++++++++++++++++-
> > >  linux/include/linux/videodev2.h        |   19 ++++++++++++++++++-
> > >  linux/include/media/v4l2-ioctl.h       |    4 ++++
> > >  3 files changed, 40 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/linux/drivers/media/video/v4l2-ioctl.c
> > > b/linux/drivers/media/video/v4l2-ioctl.c
> > > index 165bc90..7599da8 100644
> > > --- a/linux/drivers/media/video/v4l2-ioctl.c
> > > +++ b/linux/drivers/media/video/v4l2-ioctl.c
> > > @@ -270,6 +270,8 @@ static const char *v4l2_ioctls[] = {
> > >  	[_IOC_NR(VIDIOC_DBG_G_CHIP_IDENT)] = "VIDIOC_DBG_G_CHIP_IDENT",
> > >  	[_IOC_NR(VIDIOC_S_HW_FREQ_SEEK)]   = "VIDIOC_S_HW_FREQ_SEEK",
> > >  #endif
> > > +	[_IOC_NR(VIDIOC_S_COLOR_SPACE_CONV)]   =
> > > "VIDIOC_S_COLOR_SPACE_CONV", +	[_IOC_NR(VIDIOC_G_COLOR_SPACE_CONV)]  
> > > = "VIDIOC_G_COLOR_SPACE_CONV", };
> > >  #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
> > >
> > > @@ -1838,7 +1840,22 @@ static long __video_do_ioctl(struct file
> > > *file, }
> > >  		break;
> > >  	}
> > > -
> > > +	case VIDIOC_S_COLOR_SPACE_CONV:
> > > +	{
> > > +		struct v4l2_color_space_conversion *p = arg;
> > > +		if (!ops->vidioc_s_color_space_conv)
> > > +			break;
> > > +		ret = ops->vidioc_s_color_space_conv(file, fh, p);
> > > +		break;
> > > +	}
> > > +	case VIDIOC_G_COLOR_SPACE_CONV:
> > > +	{
> > > +		struct v4l2_color_space_conversion *p = arg;
> > > +		if (!ops->vidioc_g_color_space_conv)
> > > +			break;
> > > +		ret = ops->vidioc_g_color_space_conv(file, fh, p);
> > > +		break;
> > > +	}
> > >  	default:
> > >  	{
> > >  		if (!ops->vidioc_default)
> > > diff --git a/linux/include/linux/videodev2.h
> > > b/linux/include/linux/videodev2.h index b0c5010..9fbc3b0 100644
> > > --- a/linux/include/linux/videodev2.h
> > > +++ b/linux/include/linux/videodev2.h
> > > @@ -879,8 +879,10 @@ enum v4l2_power_line_frequency {
> > >  #define V4L2_CID_BACKLIGHT_COMPENSATION 	(V4L2_CID_BASE+28)
> > >  #define V4L2_CID_CHROMA_AGC                     (V4L2_CID_BASE+29)
> > >  #define V4L2_CID_COLOR_KILLER                   (V4L2_CID_BASE+30)
> > > +#define V4L2_CID_ROTATION			(V4L2_CID_BASE+31)
> > > +#define V4L2_CID_BG_COLOR			(V4L2_CID_BASE+32)
> > >  /* last CID + 1 */
> > > -#define V4L2_CID_LASTP1                         (V4L2_CID_BASE+31)
> > > +#define V4L2_CID_LASTP1                         (V4L2_CID_BASE+33)
> > >
> > >  /*  MPEG-class control IDs defined by V4L2 */
> > >  #define V4L2_CID_MPEG_BASE 			(V4L2_CTRL_CLASS_MPEG | 0x900)
> > > @@ -1192,6 +1194,17 @@ struct v4l2_hw_freq_seek {
> > >  };
> > >
> > >  /*
> > > + * Color conversion
> > > + * User needs to pass pointer to color conversion matrix
> > > + * defined by hardware
> > > + */
> > > +struct v4l2_color_space_conversion {
> > > +	__s32 coefficients[3][3];
> > > +	__s32 const_factor;
> > > +	__s32 offsets[3];
> > > +};
> > > +
> > > +/*
> > >   *	A U D I O
> > >   */
> > >  struct v4l2_audio {
> > > @@ -1493,9 +1506,13 @@ struct v4l2_chip_ident_old {
> > >  #endif
> > >
> > >  #define VIDIOC_S_HW_FREQ_SEEK	 _IOW('V', 82, struct
> > > v4l2_hw_freq_seek) +
> > > +#define VIDIOC_S_COLOR_SPACE_CONV      _IOW('V', 83, struct
> > > v4l2_color_space_conversion)
> > > +#define VIDIOC_G_COLOR_SPACE_CONV      _IOR('V', 84, struct
> > > v4l2_color_space_conversion)
> > >  /* Reminder: when adding new ioctls please add support for them to
> > >     drivers/media/video/v4l2-compat-ioctl32.c as well! */
> > >
> > > +
> > >  #ifdef __OLD_VIDIOC_
> > >  /* for compatibility, will go away some day */
> > >  #define VIDIOC_OVERLAY_OLD     	_IOWR('V', 14, int)
> > > diff --git a/linux/include/media/v4l2-ioctl.h
> > > b/linux/include/media/v4l2- ioctl.h
> > > index b01c044..0c44ecf 100644
> > > --- a/linux/include/media/v4l2-ioctl.h
> > > +++ b/linux/include/media/v4l2-ioctl.h
> > > @@ -241,6 +241,10 @@ struct v4l2_ioctl_ops {
> > >  	/* For other private ioctls */
> > >  	long (*vidioc_default)	       (struct file *file, void *fh,
> > >  					int cmd, void *arg);
> > > +	int (*vidioc_s_color_space_conv)     (struct file *file, void *fh,
> > > +					struct v4l2_color_space_conversion *a);
> > > +	int (*vidioc_g_color_space_conv)     (struct file *file, void *fh,
> > > +					struct v4l2_color_space_conversion *a);
> > >  };
> > >
> > >
> > > --
> > > 1.5.6
> >
> > [Shah, Hardik] Hi,
> > Any comments on this patch.
> > Hans/Mauro,
> > If possible can you integrate this onto your development branch.
>
> Hi Hardik,
>
> I've one question regarding the rotation control: I assume that this is
> limited to 0, 90, 180 and 270 degrees? I think it might be better to
> implement this as an enum in that case.

I also would like to see the documentation for these ioctls and controls. I 
hope my www.linuxtv.org/hg/~hverkuil/v4l-dvb-spec tree will be merged soon 
with the master, but in the meantime you can mail a diff against the 
documentation in my tree. I will ensure that the documentation patches will 
be applied correctly once the spec is merged in the main v4l-dvb 
repository.

Regards,

	Hans

-- 
Hans Verkuil - video4linux developer - sponsored by TANDBERG
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