diff options
Diffstat (limited to 'Documentation/media/uapi/v4l/buffer.rst')
| -rw-r--r-- | Documentation/media/uapi/v4l/buffer.rst | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/Documentation/media/uapi/v4l/buffer.rst b/Documentation/media/uapi/v4l/buffer.rst index 5deb4a4..f75f959 100644 --- a/Documentation/media/uapi/v4l/buffer.rst +++ b/Documentation/media/uapi/v4l/buffer.rst @@ -166,12 +166,15 @@ struct v4l2_buffer output device because the application did not pass new data in time. - .. note:: This may count the frames received e.g. over USB, without + .. note:: + + This may count the frames received e.g. over USB, without taking into account the frames dropped by the remote hardware due to limited compression throughput or bus bandwidth. These devices identify by not enumerating any video standards, see :ref:`standard`. + - .. row 10 - __u32 @@ -299,7 +302,9 @@ struct v4l2_plane ``bytesused`` will be set to the size of the plane (see the ``length`` field of this struct) by the driver. - .. note:: Note that the actual image data starts at ``data_offset`` + .. note:: + + Note that the actual image data starts at ``data_offset`` which may not be 0. - .. row 2 @@ -371,7 +376,9 @@ struct v4l2_plane field when ``type`` refers to a capture stream, applications when it refers to an output stream. - .. note:: That data_offset is included in ``bytesused``. So the + .. note:: + + That data_offset is included in ``bytesused``. So the size of the image in the plane is ``bytesused``-``data_offset`` at offset ``data_offset`` from the start of the plane. |