diff options
Diffstat (limited to 'Documentation/media/uapi/v4l/vidioc-querystd.rst')
| -rw-r--r-- | Documentation/media/uapi/v4l/vidioc-querystd.rst | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/Documentation/media/uapi/v4l/vidioc-querystd.rst b/Documentation/media/uapi/v4l/vidioc-querystd.rst index 5bf62775c740..b4a4e222c7b0 100644 --- a/Documentation/media/uapi/v4l/vidioc-querystd.rst +++ b/Documentation/media/uapi/v4l/vidioc-querystd.rst @@ -43,16 +43,16 @@ will return V4L2_STD_UNKNOWN. When detection is not possible or fails, the set must contain all standards supported by the current video input or output. -Please note that drivers shall *not* switch the video standard -automatically if a new video standard is detected. Instead, drivers -should send the ``V4L2_EVENT_SOURCE_CHANGE`` event (if they support -this) and expect that userspace will take action by calling -:ref:`VIDIOC_QUERYSTD`. The reason is that a new video standard can mean -different buffer sizes as well, and you cannot change buffer sizes on -the fly. In general, applications that receive the Source Change event -will have to call :ref:`VIDIOC_QUERYSTD`, and if the detected video -standard is valid they will have to stop streaming, set the new -standard, allocate new buffers and start streaming again. +.. note:: Drivers shall *not* switch the video standard + automatically if a new video standard is detected. Instead, drivers + should send the ``V4L2_EVENT_SOURCE_CHANGE`` event (if they support + this) and expect that userspace will take action by calling + :ref:`VIDIOC_QUERYSTD`. The reason is that a new video standard can mean + different buffer sizes as well, and you cannot change buffer sizes on + the fly. In general, applications that receive the Source Change event + will have to call :ref:`VIDIOC_QUERYSTD`, and if the detected video + standard is valid they will have to stop streaming, set the new + standard, allocate new buffers and start streaming again. Return Value |
