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Diffstat (limited to 'Documentation/media/uapi/v4l/mmap.rst')
| -rw-r--r-- | Documentation/media/uapi/v4l/mmap.rst | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/Documentation/media/uapi/v4l/mmap.rst b/Documentation/media/uapi/v4l/mmap.rst index b01f448..260c2db 100644 --- a/Documentation/media/uapi/v4l/mmap.rst +++ b/Documentation/media/uapi/v4l/mmap.rst @@ -245,12 +245,14 @@ available. The :ref:`select() <func-select>` or :ref:`poll() To start and stop capturing or output applications call the :ref:`VIDIOC_STREAMON <VIDIOC_STREAMON>` and :ref:`VIDIOC_STREAMOFF -<VIDIOC_STREAMON>` ioctl. Note :ref:`VIDIOC_STREAMOFF <VIDIOC_STREAMON>` -removes all buffers from both queues as a side effect. Since there is -no notion of doing anything "now" on a multitasking system, if an -application needs to synchronize with another event it should examine -the struct ::ref:`v4l2_buffer <v4l2-buffer>` ``timestamp`` of captured -or outputted buffers. +<VIDIOC_STREAMON>` ioctl. + +.. note:::ref:`VIDIOC_STREAMOFF <VIDIOC_STREAMON>` + removes all buffers from both queues as a side effect. Since there is + no notion of doing anything "now" on a multitasking system, if an + application needs to synchronize with another event it should examine + the struct ::ref:`v4l2_buffer <v4l2-buffer>` ``timestamp`` of captured + or outputted buffers. Drivers implementing memory mapping I/O must support the :ref:`VIDIOC_REQBUFS <VIDIOC_REQBUFS>`, :ref:`VIDIOC_QUERYBUF |