audio-select-source.rst

.. -*- coding: utf-8; mode: rst -*-

.. _AUDIO_SELECT_SOURCE:

===================
AUDIO_SELECT_SOURCE
===================

Name
----

AUDIO_SELECT_SOURCE


Synopsis
--------

.. c:function:: int ioctl(int fd, int request = AUDIO_SELECT_SOURCE, audio_stream_source_t source)


Arguments
---------

.. flat-table::
    :header-rows:  0
    :stub-columns: 0


    -  .. row 1

       -  int fd

       -  File descriptor returned by a previous call to open().

    -  .. row 2

       -  int request

       -  Equals AUDIO_SELECT_SOURCE for this command.

    -  .. row 3

       -  audio_stream_source_t source

       -  Indicates the source that shall be used for the Audio stream.


Description
-----------

This ioctl call informs the audio device which source shall be used for
the input data. The possible sources are demux or memory. If
AUDIO_SOURCE_MEMORY is selected, the data is fed to the Audio Device
through the write command.


Return Value
------------

On success 0 is returned, on error -1 and the ``errno`` variable is set
appropriately. The generic error codes are described at the
:ref:`Generic Error Codes <gen-errors>` chapter.