diff options
Diffstat (limited to 'Documentation/userspace-api/media/v4l/vidioc-encoder-cmd.rst')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/vidioc-encoder-cmd.rst | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/Documentation/userspace-api/media/v4l/vidioc-encoder-cmd.rst b/Documentation/userspace-api/media/v4l/vidioc-encoder-cmd.rst index 44aad55d9459..5673606711b4 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-encoder-cmd.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-encoder-cmd.rst @@ -1,4 +1,5 @@ .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later +.. c:namespace:: V4L .. _VIDIOC_ENCODER_CMD: @@ -11,22 +12,22 @@ Name VIDIOC_ENCODER_CMD - VIDIOC_TRY_ENCODER_CMD - Execute an encoder command - Synopsis ======== -.. c:function:: int ioctl( int fd, VIDIOC_ENCODER_CMD, struct v4l2_encoder_cmd *argp ) - :name: VIDIOC_ENCODER_CMD +.. c:macro:: VIDIOC_ENCODER_CMD + +``int ioctl(int fd, VIDIOC_ENCODER_CMD, struct v4l2_encoder_cmd *argp)`` -.. c:function:: int ioctl( int fd, VIDIOC_TRY_ENCODER_CMD, struct v4l2_encoder_cmd *argp ) - :name: VIDIOC_TRY_ENCODER_CMD +.. c:macro:: VIDIOC_TRY_ENCODER_CMD +``int ioctl(int fd, VIDIOC_TRY_ENCODER_CMD, struct v4l2_encoder_cmd *argp)`` Arguments ========= ``fd`` - File descriptor returned by :ref:`open() <func-open>`. + File descriptor returned by :c:func:`open()`. ``argp`` Pointer to struct :c:type:`v4l2_encoder_cmd`. @@ -47,16 +48,16 @@ this structure. The ``cmd`` field must contain the command code. Some commands use the ``flags`` field for additional information. -After a STOP command, :ref:`read() <func-read>` calls will read +After a STOP command, :c:func:`read()` calls will read the remaining data buffered by the driver. When the buffer is empty, -:ref:`read() <func-read>` will return zero and the next :ref:`read() <func-read>` +:c:func:`read()` will return zero and the next :c:func:`read()` call will restart the encoder. -A :ref:`read() <func-read>` or :ref:`VIDIOC_STREAMON <VIDIOC_STREAMON>` +A :c:func:`read()` or :ref:`VIDIOC_STREAMON <VIDIOC_STREAMON>` call sends an implicit START command to the encoder if it has not been started yet. Applies to both queues of mem2mem encoders. -A :ref:`close() <func-close>` or :ref:`VIDIOC_STREAMOFF <VIDIOC_STREAMON>` +A :c:func:`close()` or :ref:`VIDIOC_STREAMOFF <VIDIOC_STREAMON>` call of a streaming file descriptor sends an implicit immediate STOP to the encoder, and all buffered data is discarded. Applies to both queues of mem2mem encoders. @@ -65,7 +66,6 @@ These ioctls are optional, not all drivers may support them. They were introduced in Linux 2.6.21. They are, however, mandatory for stateful mem2mem encoders (as further documented in :ref:`encoder`). - .. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}| .. c:type:: v4l2_encoder_cmd @@ -89,7 +89,6 @@ encoders (as further documented in :ref:`encoder`). the array to zero. - .. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}| .. _encoder-cmds: @@ -134,7 +133,6 @@ encoders (as further documented in :ref:`encoder`). the encoder is already running, this command does nothing. No flags are defined for this command. - .. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}| .. _encoder-flags: @@ -151,7 +149,6 @@ encoders (as further documented in :ref:`encoder`). Does not apply to :ref:`encoder`. - Return Value ============ |