参照元†
返り値†
static int uvc_buffer_prepare(struct vb2_buffer *vb)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct uvc_video_queue *queue = vb2_get_drv_priv(vb->vb2_queue);
struct uvc_buffer *buf = container_of(vbuf, struct uvc_buffer, buf);
if (vb->type == V4L2_BUF_TYPE_VIDEO_OUTPUT &&
vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0)) {
uvc_trace(UVC_TRACE_CAPTURE, "[E] Bytes used out of bounds.\n");
return -EINVAL;
}
if (unlikely(queue->flags & UVC_QUEUE_DISCONNECTED))
return -ENODEV;
buf->state = UVC_BUF_STATE_QUEUED;
buf->error = 0;
buf->mem = vb2_plane_vaddr(vb, 0);
buf->length = vb2_plane_size(vb, 0);
if (vb->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
buf->bytesused = 0;
else
buf->bytesused = vb2_get_plane_payload(vb, 0);
return 0;
}
コメント†