Skip to content

L
linux
Commit b1925f2e authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files
Options

doc-rst: audio_function_calls: improve man-like format 

Parsing this file were causing lots of warnings with sphinx,
due to the c function prototypes.

Fix that by prepending them with .. cpp:function::

While here, use the same way we document man-like pages,
at the V4L side of the book and add escapes to asterisks.
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 8f8724f9
Hide whitespace changes
Inline Side-by-side
Showing with 220 additions and 136 deletions
Documentation/linux_tv/media/dvb/audio_function_calls.rst
View file @ b1925f2e
......@@ -9,10 +9,11 @@ Audio Function Calls
.. _audio_fopen:
open()
======
DVB audio open()
================
DESCRIPTION
Description
-----------
This system call opens a named audio device (e.g.
/dev/dvb/adapter0/audio0) for subsequent use. When an open() call has
......@@ -28,11 +29,13 @@ fail, and an error code will be returned. If the Audio Device is opened
in O_RDONLY mode, the only ioctl call that can be used is
AUDIO_GET_STATUS. All other call will return with an error code.
SYNOPSIS
Synopsis
--------
int open(const char *deviceName, int flags);
.. c:function:: int open(const char *deviceName, int flags)
PARAMETERS
Arguments
----------
......@@ -43,7 +46,7 @@ PARAMETERS
- .. row 1
- const char *deviceName
- const char \*deviceName
- Name of specific audio device.
......@@ -74,7 +77,8 @@ PARAMETERS
- (blocking mode is the default)
RETURN VALUE
Return Value
------------
......@@ -105,18 +109,21 @@ RETURN VALUE
.. _audio_fclose:
close()
=======
DVB audio close()
=================
DESCRIPTION
Description
-----------
This system call closes a previously opened audio device.
SYNOPSIS
Synopsis
--------
int close(int fd);
.. c:function:: int close(int fd)
PARAMETERS
Arguments
----------
......@@ -132,7 +139,8 @@ PARAMETERS
- File descriptor returned by a previous call to open().
RETURN VALUE
Return Value
------------
......@@ -151,10 +159,11 @@ RETURN VALUE
.. _audio_fwrite:
write()
=======
DVB audio write()
=================
DESCRIPTION
Description
-----------
This system call can only be used if AUDIO_SOURCE_MEMORY is selected
in the ioctl call AUDIO_SELECT_SOURCE. The data provided shall be in
......@@ -162,11 +171,13 @@ PES format. If O_NONBLOCK is not specified the function will block
until buffer space is available. The amount of data to be transferred is
implied by count.
SYNOPSIS
Synopsis
--------
size_t write(int fd, const void *buf, size_t count);
.. c:function:: size_t write(int fd, const void *buf, size_t count)
PARAMETERS
Arguments
----------
......@@ -183,7 +194,7 @@ PARAMETERS
- .. row 2
- void *buf
- void \*buf
- Pointer to the buffer containing the PES data.
......@@ -194,7 +205,8 @@ PARAMETERS
- Size of buf.
RETURN VALUE
Return Value
------------
......@@ -228,16 +240,19 @@ RETURN VALUE
AUDIO_STOP
==========
DESCRIPTION
Description
-----------
This ioctl call asks the Audio Device to stop playing the current
stream.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_STOP);
.. c:function:: int ioctl(int fd, int request = AUDIO_STOP)
PARAMETERS
Arguments
----------
......@@ -259,7 +274,8 @@ PARAMETERS
- Equals AUDIO_STOP for this command.
RETURN VALUE
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
......@@ -271,16 +287,19 @@ appropriately. The generic error codes are described at the
AUDIO_PLAY
==========
DESCRIPTION
Description
-----------
This ioctl call asks the Audio Device to start playing an audio stream
from the selected source.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_PLAY);
.. c:function:: int ioctl(int fd, int request = AUDIO_PLAY)
PARAMETERS
Arguments
----------
......@@ -302,7 +321,8 @@ PARAMETERS
- Equals AUDIO_PLAY for this command.
RETURN VALUE
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
......@@ -314,17 +334,20 @@ appropriately. The generic error codes are described at the
AUDIO_PAUSE
===========
DESCRIPTION
Description
-----------
This ioctl call suspends the audio stream being played. Decoding and
playing are paused. It is then possible to restart again decoding and
playing process of the audio stream using AUDIO_CONTINUE command.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_PAUSE);
.. c:function:: int ioctl(int fd, int request = AUDIO_PAUSE)
PARAMETERS
Arguments
----------
......@@ -346,7 +369,8 @@ PARAMETERS
- Equals AUDIO_PAUSE for this command.
RETURN VALUE
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
......@@ -358,16 +382,19 @@ appropriately. The generic error codes are described at the
AUDIO_CONTINUE
==============
DESCRIPTION
Description
-----------
This ioctl restarts the decoding and playing process previously paused
with AUDIO_PAUSE command.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_CONTINUE);
.. c:function:: int ioctl(int fd, int request = AUDIO_CONTINUE)
PARAMETERS
Arguments
----------
......@@ -389,7 +416,8 @@ PARAMETERS
- Equals AUDIO_CONTINUE for this command.
RETURN VALUE
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
......@@ -401,19 +429,21 @@ appropriately. The generic error codes are described at the
AUDIO_SELECT_SOURCE
===================
DESCRIPTION
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.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_SELECT_SOURCE,
audio_stream_source_t source);
.. c:function:: int ioctl(int fd, int request = AUDIO_SELECT_SOURCE, audio_stream_source_t source)
PARAMETERS
Arguments
----------
......@@ -441,7 +471,8 @@ PARAMETERS
- Indicates the source that shall be used for the Audio stream.
RETURN VALUE
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
......@@ -453,7 +484,8 @@ appropriately. The generic error codes are described at the
AUDIO_SET_MUTE
==============
DESCRIPTION
Description
-----------
This ioctl is for DVB devices only. To control a V4L2 decoder use the
V4L2 :ref:`VIDIOC_DECODER_CMD` with the
......@@ -462,11 +494,13 @@ V4L2 :ref:`VIDIOC_DECODER_CMD` with the
This ioctl call asks the audio device to mute the stream that is
currently being played.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_SET_MUTE, boolean state);
.. c:function:: int ioctl(int fd, int request = AUDIO_SET_MUTE, boolean state)
PARAMETERS
Arguments
----------
......@@ -504,7 +538,8 @@ PARAMETERS
- FALSE Audio Un-mute
RETURN VALUE
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
......@@ -516,16 +551,19 @@ appropriately. The generic error codes are described at the
AUDIO_SET_AV_SYNC
=================
DESCRIPTION
Description
-----------
This ioctl call asks the Audio Device to turn ON or OFF A/V
synchronization.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_SET_AV_SYNC, boolean state);
.. c:function:: int ioctl(int fd, int request = AUDIO_SET_AV_SYNC, boolean state)
PARAMETERS
Arguments
----------
......@@ -563,7 +601,8 @@ PARAMETERS
- FALSE AV-sync OFF
RETURN VALUE
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
......@@ -575,7 +614,8 @@ appropriately. The generic error codes are described at the
AUDIO_SET_BYPASS_MODE
=====================
DESCRIPTION
Description
-----------
This ioctl call asks the Audio Device to bypass the Audio decoder and
forward the stream without decoding. This mode shall be used if streams
......@@ -583,11 +623,13 @@ that can’t be handled by the DVB system shall be decoded. Dolby
DigitalTM streams are automatically forwarded by the DVB subsystem if
the hardware can handle it.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_SET_BYPASS_MODE, boolean mode);
.. c:function:: int ioctl(int fd, int request = AUDIO_SET_BYPASS_MODE, boolean mode)
PARAMETERS
Arguments
----------
......@@ -626,7 +668,8 @@ PARAMETERS
- FALSE Bypass is enabled
RETURN VALUE
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
......@@ -638,7 +681,8 @@ appropriately. The generic error codes are described at the
AUDIO_CHANNEL_SELECT
====================
DESCRIPTION
Description
-----------
This ioctl is for DVB devices only. To control a V4L2 decoder use the
V4L2 ``V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK`` control instead.
......@@ -646,12 +690,13 @@ V4L2 ``V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK`` control instead.
This ioctl call asks the Audio Device to select the requested channel if
possible.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_CHANNEL_SELECT,
audio_channel_select_t);
.. c:function:: int ioctl(int fd, int request = AUDIO_CHANNEL_SELECT, audio_channel_select_t)
PARAMETERS
Arguments
----------
......@@ -679,7 +724,8 @@ PARAMETERS
- Select the output format of the audio (mono left/right, stereo).
RETURN VALUE
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
......@@ -691,7 +737,8 @@ appropriately. The generic error codes are described at the
AUDIO_BILINGUAL_CHANNEL_SELECT
==============================
DESCRIPTION
Description
-----------
This ioctl is obsolete. Do not use in new drivers. It has been replaced
by the V4L2 ``V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK`` control
......@@ -700,12 +747,13 @@ for MPEG decoders controlled through V4L2.
This ioctl call asks the Audio Device to select the requested channel
for bilingual streams if possible.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_BILINGUAL_CHANNEL_SELECT,
audio_channel_select_t);
.. c:function:: int ioctl(int fd, int request = AUDIO_BILINGUAL_CHANNEL_SELECT, audio_channel_select_t)
PARAMETERS
Arguments
----------
......@@ -733,7 +781,8 @@ PARAMETERS
- Select the output format of the audio (mono left/right, stereo).
RETURN VALUE
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
......@@ -745,7 +794,8 @@ appropriately. The generic error codes are described at the
AUDIO_GET_PTS
=============
DESCRIPTION
Description
-----------
This ioctl is obsolete. Do not use in new drivers. If you need this
functionality, then please contact the linux-media mailing list
......@@ -754,11 +804,13 @@ functionality, then please contact the linux-media mailing list
This ioctl call asks the Audio Device to return the current PTS
timestamp.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_GET_PTS, __u64 *pts);
.. c:function:: int ioctl(int fd, int request = AUDIO_GET_PTS, __u64 *pts)
PARAMETERS
Arguments
----------
......@@ -781,7 +833,7 @@ PARAMETERS
- .. row 3
- __u64 *pts
- __u64 \*pts
- Returns the 33-bit timestamp as defined in ITU T-REC-H.222.0 /
ISO/IEC 13818-1.
......@@ -791,7 +843,8 @@ PARAMETERS
decoded frame or the last PTS extracted by the PES parser.
RETURN VALUE
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
......@@ -803,17 +856,19 @@ appropriately. The generic error codes are described at the
AUDIO_GET_STATUS
================
DESCRIPTION
Description
-----------
This ioctl call asks the Audio Device to return the current state of the
Audio Device.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_GET_STATUS, struct audio_status
*status);
.. c:function:: int ioctl(int fd, int request = AUDIO_GET_STATUS, struct audio_status *status)
PARAMETERS
Arguments
----------
......@@ -836,12 +891,13 @@ PARAMETERS
- .. row 3
- struct audio_status *status
- struct audio_status \*status
- Returns the current state of Audio Device.
RETURN VALUE
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
......@@ -853,17 +909,19 @@ appropriately. The generic error codes are described at the
AUDIO_GET_CAPABILITIES
======================
DESCRIPTION
Description
-----------
This ioctl call asks the Audio Device to tell us about the decoding
capabilities of the audio hardware.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_GET_CAPABILITIES, unsigned int
*cap);
.. c:function:: int ioctl(int fd, int request = AUDIO_GET_CAPABILITIES, unsigned int *cap)
PARAMETERS
Arguments
----------
......@@ -886,12 +944,13 @@ PARAMETERS
- .. row 3
- unsigned int *cap
- unsigned int \*cap
- Returns a bit array of supported sound formats.
RETURN VALUE
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
......@@ -903,16 +962,19 @@ appropriately. The generic error codes are described at the
AUDIO_CLEAR_BUFFER
==================
DESCRIPTION
Description
-----------
This ioctl call asks the Audio Device to clear all software and hardware
buffers of the audio decoder device.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_CLEAR_BUFFER);
.. c:function:: int ioctl(int fd, int request = AUDIO_CLEAR_BUFFER)
PARAMETERS
Arguments
----------
......@@ -934,7 +996,8 @@ PARAMETERS
- Equals AUDIO_CLEAR_BUFFER for this command.
RETURN VALUE
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
......@@ -946,7 +1009,8 @@ appropriately. The generic error codes are described at the
AUDIO_SET_ID
============
DESCRIPTION
Description
-----------
This ioctl selects which sub-stream is to be decoded if a program or
system stream is sent to the video device. If no audio stream type is
......@@ -956,11 +1020,13 @@ other stream types. If the stream type is set the id just specifies the
substream id of the audio stream and only the first 5 bits are
recognized.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_SET_ID, int id);
.. c:function:: int ioctl(int fd, int request = AUDIO_SET_ID, int id)
PARAMETERS
Arguments
----------
......@@ -988,7 +1054,8 @@ PARAMETERS
- audio sub-stream id
RETURN VALUE
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
......@@ -1000,16 +1067,18 @@ appropriately. The generic error codes are described at the
AUDIO_SET_MIXER
===============
DESCRIPTION
Description
-----------
This ioctl lets you adjust the mixer settings of the audio decoder.
SYNOPSIS
Synopsis
--------
int ioctl(int fd, int request = AUDIO_SET_MIXER, audio_mixer_t
*mix);
.. c:function:: int ioctl(int fd, int request = AUDIO_SET_MIXER, audio_mixer_t *mix)
PARAMETERS
Arguments
----------
......@@ -1032,12 +1101,13 @@ PARAMETERS
- .. row 3
- audio_mixer_t *mix
- audio_mixer_t \*mix
- mixer settings.
RETURN VALUE
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
......@@ -1049,17 +1119,20 @@ appropriately. The generic error codes are described at the
AUDIO_SET_STREAMTYPE
====================
DESCRIPTION
Description
-----------
This ioctl tells the driver which kind of audio stream to expect. This
is useful if the stream offers several audio sub-streams like LPCM and
AC3.
SYNOPSIS
Synopsis
--------
int ioctl(fd, int request = AUDIO_SET_STREAMTYPE, int type);
.. c:function:: int ioctl(fd, int request = AUDIO_SET_STREAMTYPE, int type)
PARAMETERS
Arguments
----------
......@@ -1087,7 +1160,8 @@ PARAMETERS
- stream type
RETURN VALUE
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
......@@ -1113,16 +1187,19 @@ appropriately. The generic error codes are described at the
AUDIO_SET_EXT_ID
================
DESCRIPTION
Description
-----------
This ioctl can be used to set the extension id for MPEG streams in DVD
playback. Only the first 3 bits are recognized.
SYNOPSIS
Synopsis
--------
int ioctl(fd, int request = AUDIO_SET_EXT_ID, int id);
.. c:function:: int ioctl(fd, int request = AUDIO_SET_EXT_ID, int id)
PARAMETERS
Arguments
----------
......@@ -1150,7 +1227,8 @@ PARAMETERS
- audio sub_stream_id
RETURN VALUE
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
......@@ -1176,17 +1254,19 @@ appropriately. The generic error codes are described at the
AUDIO_SET_ATTRIBUTES
====================
DESCRIPTION
Description
-----------
This ioctl is intended for DVD playback and allows you to set certain
information about the audio stream.
SYNOPSIS
Synopsis
--------
int ioctl(fd, int request = AUDIO_SET_ATTRIBUTES, audio_attributes_t
attr );
.. c:function:: int ioctl(fd, int request = AUDIO_SET_ATTRIBUTES, audio_attributes_t attr )
PARAMETERS
Arguments
----------
......@@ -1214,7 +1294,8 @@ PARAMETERS
- audio attributes according to section ??
RETURN VALUE
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
......@@ -1240,16 +1321,18 @@ appropriately. The generic error codes are described at the
AUDIO_SET_KARAOKE
=================
DESCRIPTION
Description
-----------
This ioctl allows one to set the mixer settings for a karaoke DVD.
SYNOPSIS
Synopsis
--------
int ioctl(fd, int request = AUDIO_SET_KARAOKE, audio_karaoke_t
*karaoke);
.. c:function:: int ioctl(fd, int request = AUDIO_SET_KARAOKE, audio_karaoke_t *karaoke)
PARAMETERS
Arguments
----------
......@@ -1272,12 +1355,13 @@ PARAMETERS
- .. row 3
- audio_karaoke_t *karaoke
- audio_karaoke_t \*karaoke
- karaoke settings according to section ??.
RETURN VALUE
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
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7