media/v4l/audio.rst

1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
6 Audio Inputs and Outputs
9 Audio inputs and outputs are physical connectors of a device. Video
10 capture devices have inputs, output devices have outputs, zero or more
11 each. Radio devices have no audio inputs or outputs. They have exactly
13 tuners with video inputs or outputs only, and radio devices have none of
17 Audio and video inputs and outputs are associated. Selecting a video
29 outputs applications can enumerate them with the
52 Drivers must implement all audio input ioctls when the device has
53 multiple selectable audio inputs, all audio output ioctls when the
54 device has multiple selectable audio outputs. When the device has any
55 audio inputs or outputs the driver must set the ``V4L2_CAP_AUDIO`` flag
63 .. code-block:: c
69     if (-1 == ioctl(fd, VIDIOC_G_AUDIO, &audio)) {
80 .. code-block:: c
88     if (-1 == ioctl(fd, VIDIOC_S_AUDIO, &audio)) {