Documentation/userspace-api/media/v4l/audio.rst

Source file repositories/reference/linux-study-clean/Documentation/userspace-api/media/v4l/audio.rst

File Facts

System
Linux kernel
Corpus path
Documentation/userspace-api/media/v4l/audio.rst
Extension
.rst
Size
3592 bytes
Lines
99
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: documentation
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (-1 == ioctl(fd, VIDIOC_G_AUDIO, &audio)) {
	perror("VIDIOC_G_AUDIO");
	exit(EXIT_FAILURE);
    }

    printf("Current input: %s\\n", audio.name);


Example: Switching to the first audio input
===========================================

.. code-block:: c

    struct v4l2_audio audio;

    memset(&audio, 0, sizeof(audio)); /* clear audio.mode, audio.reserved */

    audio.index = 0;

    if (-1 == ioctl(fd, VIDIOC_S_AUDIO, &audio)) {
	perror("VIDIOC_S_AUDIO");
	exit(EXIT_FAILURE);
    }

.. [#f1]
   Actually struct :c:type:`v4l2_audio` ought to have a
   ``tuner`` field like struct :c:type:`v4l2_input`, not
   only making the API more consistent but also permitting radio devices
   with multiple tuners.

Annotation

Implementation Notes