ioctl: add bitflags for buffer flags

lib/src/ioctl.rs

@@ -94,6 +94,7 @@ use std::ffi::CStr;
 use std::ffi::FromBytesWithNulError;
 use std::fmt::Debug;
 
+use bitflags::bitflags;
 use nix::errno::Errno;
 
 use crate::bindings;
@@ -218,6 +219,29 @@ impl<'a> V4l2BufferPlane<'a> {
     }
 }
 
+bitflags! {
+    #[derive(Clone, Copy, Debug)]
+    /// `flags` member of `struct `v4l2_buffer`.
+    pub struct BufferFlags: u32 {
+        const MAPPED = bindings::V4L2_BUF_FLAG_MAPPED;
+        const QUEUED = bindings::V4L2_BUF_FLAG_QUEUED;
+        const DONE = bindings::V4L2_BUF_FLAG_DONE;
+        const ERROR = bindings::V4L2_BUF_FLAG_ERROR;
+        const KEYFRAME = bindings::V4L2_BUF_FLAG_KEYFRAME;
+        const PFRAME = bindings::V4L2_BUF_FLAG_PFRAME;
+        const BFRAME = bindings::V4L2_BUF_FLAG_BFRAME;
+        const TIMECODE = bindings::V4L2_BUF_FLAG_TIMECODE;
+        const PREPARED = bindings::V4L2_BUF_FLAG_PREPARED;
+        const NO_CACHE_INVALIDATE = bindings::V4L2_BUF_FLAG_NO_CACHE_CLEAN;
+        const NO_CACHE_CLEAN = bindings::V4L2_BUF_FLAG_NO_CACHE_INVALIDATE;
+        const LAST = bindings::V4L2_BUF_FLAG_LAST;
+        const TIMESTAMP_MONOTONIC = bindings::V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+        const TIMESTAMP_COPY = bindings::V4L2_BUF_FLAG_TIMESTAMP_COPY;
+        const TSTAMP_SRC_EOF = bindings::V4L2_BUF_FLAG_TSTAMP_SRC_EOF;
+        const TSTAMP_SRC_SOE = bindings::V4L2_BUF_FLAG_TSTAMP_SRC_SOE;
+    }
+}
+
 /// A completely owned v4l2_buffer, where the pointer to planes is meaningless and fixed up when
 /// needed.
 ///