.. _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
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
+----------
- .. row 1
- - const char *deviceName
+ - const char \*deviceName
- Name of specific audio device.
- (blocking mode is the default)
-RETURN VALUE
+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
+----------
- File descriptor returned by a previous call to open().
-RETURN VALUE
+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
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
+----------
- .. row 2
- - void *buf
+ - void \*buf
- Pointer to the buffer containing the PES data.
- Size of buf.
-RETURN VALUE
+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
+----------
- 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
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
+----------
- 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
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
+----------
- 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
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
+----------
- 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
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
+----------
- 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
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
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
+----------
- 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
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
+----------
- 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
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
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
+----------
- 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
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.
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
+----------
- 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
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
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
+----------
- 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
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
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
+----------
- .. row 3
- - __u64 *pts
+ - __u64 \*pts
- Returns the 33-bit timestamp as defined in ITU T-REC-H.222.0 /
ISO/IEC 13818-1.
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
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
+----------
- .. 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
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
+----------
- .. 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
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
+----------
- 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
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
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
+----------
- 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
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
+----------
- .. 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
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
+----------
- 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
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
+----------
- 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
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
+----------
- 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
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
+----------
- .. 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
projects / linux-beck.git / commitdiff