From b799d09a157da71566e8013a62073435550cab6d Mon Sep 17 00:00:00 2001 From: Tomasz Stanislawski Date: Thu, 14 Jun 2012 11:32:23 -0300 Subject: [media] v4l: add buffer exporting via dmabuf This patch adds extension to V4L2 api. A new ioctl VIDIOC_EXPBUF is added. The ioctl is used to export an mmap buffer as a DMABUF file descriptor. Signed-off-by: Tomasz Stanislawski Signed-off-by: Kyungmin Park Acked-by: Hans Verkuil Tested-by: Mauro Carvalho Chehab Signed-off-by: Mauro Carvalho Chehab --- include/uapi/linux/videodev2.h | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'include/uapi') diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h index 91ac83b21c20..3cf3e946e331 100644 --- a/include/uapi/linux/videodev2.h +++ b/include/uapi/linux/videodev2.h @@ -694,6 +694,33 @@ struct v4l2_buffer { #define V4L2_BUF_FLAG_NO_CACHE_INVALIDATE 0x0800 #define V4L2_BUF_FLAG_NO_CACHE_CLEAN 0x1000 +/** + * struct v4l2_exportbuffer - export of video buffer as DMABUF file descriptor + * + * @index: id number of the buffer + * @type: enum v4l2_buf_type; buffer type (type == *_MPLANE for + * multiplanar buffers); + * @plane: index of the plane to be exported, 0 for single plane queues + * @flags: flags for newly created file, currently only O_CLOEXEC is + * supported, refer to manual of open syscall for more details + * @fd: file descriptor associated with DMABUF (set by driver) + * + * Contains data used for exporting a video buffer as DMABUF file descriptor. + * The buffer is identified by a 'cookie' returned by VIDIOC_QUERYBUF + * (identical to the cookie used to mmap() the buffer to userspace). All + * reserved fields must be set to zero. The field reserved0 is expected to + * become a structure 'type' allowing an alternative layout of the structure + * content. Therefore this field should not be used for any other extensions. + */ +struct v4l2_exportbuffer { + __u32 type; /* enum v4l2_buf_type */ + __u32 index; + __u32 plane; + __u32 flags; + __s32 fd; + __u32 reserved[11]; +}; + /* * O V E R L A Y P R E V I E W */ @@ -1895,6 +1922,7 @@ struct v4l2_create_buffers { #define VIDIOC_S_FBUF _IOW('V', 11, struct v4l2_framebuffer) #define VIDIOC_OVERLAY _IOW('V', 14, int) #define VIDIOC_QBUF _IOWR('V', 15, struct v4l2_buffer) +#define VIDIOC_EXPBUF _IOWR('V', 16, struct v4l2_exportbuffer) #define VIDIOC_DQBUF _IOWR('V', 17, struct v4l2_buffer) #define VIDIOC_STREAMON _IOW('V', 18, int) #define VIDIOC_STREAMOFF _IOW('V', 19, int) -- cgit v1.2.3