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1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 VIDIOC_ENCODER_CMD - VIDIOC_TRY_ENCODER_CMD - Execute an encoder command
38 These ioctls control an audio/video (usually MPEG-) encoder.
43 To send a command applications must initialize all fields of a struct
52 the remaining data buffered by the driver. When the buffer is empty,
57 call sends an implicit START command to the encoder if it has not been
65 These ioctls are optional, not all drivers may support them. They were
73 .. flat-table:: struct v4l2_encoder_cmd
74     :header-rows:  0
75     :stub-columns: 0
78     * - __u32
79       - ``cmd``
80       - The encoder command, see :ref:`encoder-cmds`.
81     * - __u32
82       - ``flags``
83       - Flags to go with the command, see :ref:`encoder-flags`. If no
86     * - __u32
87       - ``data``\ [8]
88       - Reserved for future extensions. Drivers and applications must set
94 .. _encoder-cmds:
96 .. flat-table:: Encoder Commands
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98     :stub-columns: 0
101     * - ``V4L2_ENC_CMD_START``
102       - 0
103       - Start the encoder. When the encoder is already running or paused,
111     * - ``V4L2_ENC_CMD_STOP``
112       - 1
113       - Stop the encoder. When the ``V4L2_ENC_CMD_STOP_AT_GOP_END`` flag
123     * - ``V4L2_ENC_CMD_PAUSE``
124       - 2
125       - Pause the encoder. When the encoder has not been started yet, the
129     * - ``V4L2_ENC_CMD_RESUME``
130       - 3
131       - Resume encoding after a PAUSE command. When the encoder has not
138 .. _encoder-flags:
140 .. flat-table:: Encoder Command Flags
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142     :stub-columns: 0
145     * - ``V4L2_ENC_CMD_STOP_AT_GOP_END``
146       - 0x0001
147       - Stop encoding at the end of the current *Group Of Pictures*,
150         Does not apply to :ref:`encoder`.
155 On success 0 is returned, on error -1 and the ``errno`` variable is set
157 :ref:`Generic Error Codes <gen-errors>` chapter.
161     progress. It is not allowed to issue another encoder command until it
169     not running.