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From: Sakari Ailus <sakari.ailus@iki.fi>
To: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Hans Verkuil <hverkuil@xs4all.nl>,
	Linux Media Mailing List <linux-media@vger.kernel.org>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Pawel Osciak <pawel@osciak.com>,
	Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>,
	Mauro Carvalho Chehab <mchehab@infradead.org>,
	Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: [PATCH 2/9 v9] V4L: add two new ioctl()s for multi-size videobuffer management
Date: Wed, 28 Sep 2011 16:33:53 +0300	[thread overview]
Message-ID: <4E832241.7030501@iki.fi> (raw)
In-Reply-To: <Pine.LNX.4.64.1109281502380.30317@axis700.grange>

Guennadi Liakhovetski wrote:
> A possibility to preallocate and initialise buffers of different sizes
> in V4L2 is required for an efficient implementation of a snapshot
> mode. This patch adds two new ioctl()s: VIDIOC_CREATE_BUFS and
> VIDIOC_PREPARE_BUF and defines respective data structures.
> 
> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>

Hi Guennadi,

Thanks for the patch and your tireless efforts on this!

VIDIOC_PREPARE_BUF is actually _IOW (rather than _IOWR) in this patch. I
guess it shouldn't be this way, or have I failed to understand
something? :-)

[clip]

> @@ -2189,6 +2202,11 @@ struct v4l2_dbg_chip_ident {
>  #define	VIDIOC_SUBSCRIBE_EVENT	 _IOW('V', 90, struct v4l2_event_subscription)
>  #define	VIDIOC_UNSUBSCRIBE_EVENT _IOW('V', 91, struct v4l2_event_subscription)
>  
> +/* Experimental, the below two ioctls may change over the next couple of kernel
> +   versions */
> +#define VIDIOC_CREATE_BUFS	_IOWR('V', 92, struct v4l2_create_buffers)
> +#define VIDIOC_PREPARE_BUF	 _IOW('V', 93, struct v4l2_buffer)
> +
>  /* Reminder: when adding new ioctls please add support for them to
>     drivers/media/video/v4l2-compat-ioctl32.c as well! */
>  


-- 
Sakari Ailus
sakari.ailus@iki.fi

  reply	other threads:[~2011-09-28 13:34 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-31 18:02 [PATCH 0/9 v6] new ioctl()s and soc-camera implementation Guennadi Liakhovetski
2011-08-31 18:02 ` [PATCH 1/9 v6] V4L: add a new videobuf2 buffer state VB2_BUF_STATE_PREPARED Guennadi Liakhovetski
2011-08-31 18:02 ` [PATCH 2/9 v6] V4L: add two new ioctl()s for multi-size videobuffer management Guennadi Liakhovetski
2011-08-31 21:06   ` Sakari Ailus
2011-09-01  7:03     ` Guennadi Liakhovetski
2011-09-01  8:35       ` Laurent Pinchart
2011-09-01  8:53         ` Guennadi Liakhovetski
2011-09-01  8:42       ` Sakari Ailus
2011-09-01  9:24         ` Guennadi Liakhovetski
2011-09-01 10:19           ` Sakari Ailus
2011-09-01 10:51             ` Guennadi Liakhovetski
2011-09-01 11:06               ` Sakari Ailus
2011-09-01 13:35                 ` Laurent Pinchart
2011-09-01 13:45                   ` Guennadi Liakhovetski
2011-09-08  7:45         ` [PATCH 2/9 v7] " Guennadi Liakhovetski
2011-09-08  7:46           ` [PATCH 3/9 v7] V4L: document the new VIDIOC_CREATE_BUFS and VIDIOC_PREPARE_BUF ioctl()s Guennadi Liakhovetski
2011-09-09 13:24             ` Laurent Pinchart
2011-09-27 10:51             ` Hans Verkuil
2011-09-27 15:49               ` Guennadi Liakhovetski
2011-09-27 19:50                 ` Sakari Ailus
2011-09-28  7:34                 ` Hans Verkuil
2011-09-27 17:01               ` [PATCH 3/9 v8] " Guennadi Liakhovetski
2011-09-28 13:20                 ` [PATCH 3/9 v9] " Guennadi Liakhovetski
2011-09-28 14:58                   ` [PATCH 3/9 v10] " Guennadi Liakhovetski
2011-09-08  7:48           ` [PATCH] V4L: docbook documentation for struct v4l2_create_buffers Guennadi Liakhovetski
2011-09-08  8:10           ` [PATCH 1/1] v4l: Mark VIDIOC_PREPARE_BUFS and VIDIOC_CREATE_BUFS experimental Sakari Ailus
2011-09-27 10:34           ` [PATCH 2/9 v7] V4L: add two new ioctl()s for multi-size videobuffer management Hans Verkuil
2011-09-27 11:00             ` Guennadi Liakhovetski
2011-09-27 11:06               ` Hans Verkuil
2011-09-27 12:19                 ` Guennadi Liakhovetski
2011-09-27 13:40                   ` Hans Verkuil
2011-09-27 16:54                     ` [PATCH 2/9 v8] " Guennadi Liakhovetski
2011-09-28  8:06                       ` Hans Verkuil
2011-09-28  8:34                         ` Guennadi Liakhovetski
2011-09-28  8:48                           ` Guennadi Liakhovetski
2011-09-28  9:01                             ` Hans Verkuil
2011-09-28 13:19                       ` [PATCH 2/9 v9] " Guennadi Liakhovetski
2011-09-28 13:33                         ` Sakari Ailus [this message]
2011-09-28 14:59                           ` Guennadi Liakhovetski
2011-09-28 14:56                         ` [PATCH 2/9 v10] " Guennadi Liakhovetski
2011-09-28 20:15                           ` Sakari Ailus
2011-09-28 20:38                             ` Guennadi Liakhovetski
2011-09-29  6:59                               ` Sakari Ailus
2011-09-29  8:12                                 ` Guennadi Liakhovetski
2011-09-27 17:08             ` [PATCH 2/9 v7] " Laurent Pinchart
2011-09-28  8:09               ` Hans Verkuil
2011-08-31 18:02 ` [PATCH 3/9 v6] V4L: document the new VIDIOC_CREATE_BUFS and VIDIOC_PREPARE_BUF ioctl()s Guennadi Liakhovetski
2011-08-31 21:11   ` Sakari Ailus
2011-09-01  7:10     ` Guennadi Liakhovetski
2011-09-01 11:08       ` [PATCH 1/1] v4l: Add note on buffer locking to memory and DMA mapping to PREPARE_BUF Sakari Ailus
2011-09-28 20:20         ` Sakari Ailus
2011-09-28 20:31           ` Guennadi Liakhovetski
2011-11-03 12:13   ` [PATCH 3/9 v6] V4L: document the new VIDIOC_CREATE_BUFS and VIDIOC_PREPARE_BUF ioctl()s Mauro Carvalho Chehab
2011-08-31 18:02 ` [PATCH 4/9 v6] V4L: vb2: prepare to support multi-size buffers Guennadi Liakhovetski
2011-08-31 18:02 ` [PATCH 5/9 v6] V4L: vb2: add support for buffers of different sizes on a single queue Guennadi Liakhovetski
2011-08-31 18:02 ` [PATCH 6/9 v6] V4L: sh-mobile-ceu-camera: prepare to support multi-size buffers Guennadi Liakhovetski
2011-08-31 18:02 ` [PATCH 7/9 v6] dmaengine: ipu-idmac: add support for the DMA_PAUSE control Guennadi Liakhovetski
2011-08-31 18:02 ` [PATCH 8/9 v6] V4L: mx3-camera: prepare to support multi-size buffers Guennadi Liakhovetski
2011-08-31 18:02 ` [PATCH 9/9 v6] V4L: soc-camera: add 2 new ioctl() handlers Guennadi Liakhovetski

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