[media] V4L: add two new ioctl()s for multi-size videobuffer management
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>
diff --git a/drivers/media/video/v4l2-ioctl.c b/drivers/media/video/v4l2-ioctl.c
index 24fd433..e1da8fc 100644
--- a/drivers/media/video/v4l2-ioctl.c
+++ b/drivers/media/video/v4l2-ioctl.c
@@ -273,6 +273,8 @@
[_IOC_NR(VIDIOC_DQEVENT)] = "VIDIOC_DQEVENT",
[_IOC_NR(VIDIOC_SUBSCRIBE_EVENT)] = "VIDIOC_SUBSCRIBE_EVENT",
[_IOC_NR(VIDIOC_UNSUBSCRIBE_EVENT)] = "VIDIOC_UNSUBSCRIBE_EVENT",
+ [_IOC_NR(VIDIOC_CREATE_BUFS)] = "VIDIOC_CREATE_BUFS",
+ [_IOC_NR(VIDIOC_PREPARE_BUF)] = "VIDIOC_PREPARE_BUF",
};
#define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
@@ -2104,6 +2106,40 @@
dbgarg(cmd, "type=0x%8.8x", sub->type);
break;
}
+ case VIDIOC_CREATE_BUFS:
+ {
+ struct v4l2_create_buffers *create = arg;
+
+ if (!ops->vidioc_create_bufs)
+ break;
+ if (ret_prio) {
+ ret = ret_prio;
+ break;
+ }
+ ret = check_fmt(ops, create->format.type);
+ if (ret)
+ break;
+
+ ret = ops->vidioc_create_bufs(file, fh, create);
+
+ dbgarg(cmd, "count=%d @ %d\n", create->count, create->index);
+ break;
+ }
+ case VIDIOC_PREPARE_BUF:
+ {
+ struct v4l2_buffer *b = arg;
+
+ if (!ops->vidioc_prepare_buf)
+ break;
+ ret = check_fmt(ops, b->type);
+ if (ret)
+ break;
+
+ ret = ops->vidioc_prepare_buf(file, fh, b);
+
+ dbgarg(cmd, "index=%d", b->index);
+ break;
+ }
default:
if (!ops->vidioc_default)
break;