Documentation/linux_tv/media/dvb/audio-channel-select.rst

   1 .. -*- coding: utf-8; mode: rst -*-
   2
   3 .. _AUDIO_CHANNEL_SELECT:
   4
   5 AUDIO_CHANNEL_SELECT
   6 ====================
   7
   8 Description
   9 -----------
  10
  11 This ioctl is for DVB devices only. To control a V4L2 decoder use the
  12 V4L2 ``V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK`` control instead.
  13
  14 This ioctl call asks the Audio Device to select the requested channel if
  15 possible.
  16
  17 Synopsis
  18 --------
  19
  20 .. c:function:: int ioctl(int fd, int request = AUDIO_CHANNEL_SELECT, audio_channel_select_t)
  21
  22 Arguments
  23 ----------
  24
  25
  26
  27 .. flat-table::
  28     :header-rows:  0
  29     :stub-columns: 0
  30
  31
  32     -  .. row 1
  33
  34        -  int fd
  35
  36        -  File descriptor returned by a previous call to open().
  37
  38     -  .. row 2
  39
  40        -  int request
  41
  42        -  Equals AUDIO_CHANNEL_SELECT for this command.
  43
  44     -  .. row 3
  45
  46        -  audio_channel_select_t ch
  47
  48        -  Select the output format of the audio (mono left/right, stereo).
  49
  50
  51 Return Value
  52 ------------
  53
  54 On success 0 is returned, on error -1 and the ``errno`` variable is set
  55 appropriately. The generic error codes are described at the
  56 :ref:`Generic Error Codes <gen-errors>` chapter.
  57
  58