tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1.. -*- coding: utf-8; mode: rst -*-
2
3.. _AUDIO_SET_ID:
4
5============
6AUDIO_SET_ID
7============
8
9Name
10----
11
12AUDIO_SET_ID
13
14
15Synopsis
16--------
17
18.. cpp:function:: int ioctl(int fd, int request = AUDIO_SET_ID, int id)
19
20
21Arguments
22---------
23
24.. flat-table::
25 :header-rows: 0
26 :stub-columns: 0
27
28
29 - .. row 1
30
31 - int fd
32
33 - File descriptor returned by a previous call to open().
34
35 - .. row 2
36
37 - int request
38
39 - Equals AUDIO_SET_ID for this command.
40
41 - .. row 3
42
43 - int id
44
45 - audio sub-stream id
46
47
48Description
49-----------
50
51This ioctl selects which sub-stream is to be decoded if a program or
52system stream is sent to the video device. If no audio stream type is
53set the id has to be in [0xC0,0xDF] for MPEG sound, in [0x80,0x87] for
54AC3 and in [0xA0,0xA7] for LPCM. More specifications may follow for
55other stream types. If the stream type is set the id just specifies the
56substream id of the audio stream and only the first 5 bits are
57recognized.
58
59
60Return Value
61------------
62
63On success 0 is returned, on error -1 and the ``errno`` variable is set
64appropriately. The generic error codes are described at the
65:ref:`Generic Error Codes <gen-errors>` chapter.