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[media] V4L: add two new ioctl()s for multi-size videobuffer management

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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>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Guennadi Liakhovetski
2011-09-28 11:34:06 -03:00
committed by Mauro Carvalho Chehab
parent ebc087d090
commit 2150158b31
4 changed files with 115 additions and 8 deletions
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18
include/linux/videodev2.h
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@@ -653,6 +653,10 @@ struct v4l2_buffer {
#define V4L2_BUF_FLAG_ERROR 0x0040
#define V4L2_BUF_FLAG_TIMECODE 0x0100 /* timecode field is valid */
#define V4L2_BUF_FLAG_INPUT 0x0200 /* input field is valid */
#define V4L2_BUF_FLAG_PREPARED 0x0400 /* Buffer is prepared for queuing */
/* Cache handling flags */
#define V4L2_BUF_FLAG_NO_CACHE_INVALIDATE 0x0800
#define V4L2_BUF_FLAG_NO_CACHE_CLEAN 0x1000
/*
* O V E R L A Y P R E V I E W
@@ -2138,6 +2142,15 @@ struct v4l2_dbg_chip_ident {
__u32 revision; /* chip revision, chip specific */
} __attribute__ ((packed));
/* VIDIOC_CREATE_BUFS */
struct v4l2_create_buffers {
__u32 index; /* output: buffers index...index + count - 1 have been created */
__u32 count;
enum v4l2_memory memory;
struct v4l2_format format; /* "type" is used always, the rest if sizeimage == 0 */
__u32 reserved[8];
};
/*
* I O C T L C O D E S F O R V I D E O D E V I C E S
*
@@ -2228,6 +2241,11 @@ 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 _IOWR('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! */