iecset Man page

iecset General Commands Manual iecset

NAME

iecset – Set or dump IEC958 status bits

SYNOPSIS

iecset [options] [cmd arg…]

DESCRIPTION

iecset is a small utility to set or dump the IEC958 (or so-called
“S/PDIF”) status bits of the specified sound card via ALSA control API.

When iecset is started without arguments except for options, it will
show the current IEC958 status in a human-readable form. When the com‐
mands are given in the arguments, they are parsed and the IEC958 status
bits are updated. The resultant status is shown as well.

The commands consist of the command directive and the argument. As the
boolean argument, yes, no, true, false, or a digit number is allowed.

EXAMPLES
iecset -Dhw:1
Displays the current IEC958 status bits on the second card.
This is equivalent with -c 1.

iecset -x
Displays the current IEC958 status bits in a style of the argu‐
ments for the PCM stream. The output string can be passed to
the iec958 (or spdif) PCM type as the optional argument.

iecset pro off audio off
Sets the current status to the consumer-mode and turns on the
non-audio bit. The modified status will be shown, too.

OPTIONS

-D device
Specifies the device name of the control to open

-c card
Specifies the card index to open. Equivalent with -Dhw:x.

-n index
Specifies the IEC958 control element index, in case you have
multiple IEC958 devices and need to choose one of them.

-x Dumps the status in the form of AESx bytes.

-i Reads the command sequences from stdin. Each line has single
command.

COMMANDS
professional
The professional mode (true) or consumer mode (false).

audio
The audio mode (true) or non-audio mode (false).

rate
The sample rate in Hz.

emphasis
The emphasis: 0 = none, 1 = 50/15us, 2 = CCITT.

lock
Rate lock: locked (true), unlocked (false). This command is for
the professional mode only.

sbits
Sample bits: 2 = 20bit, 4 = 24bit, 6 = undefined. This command
is for the professional mode only.

wordlength
Wordlength: 0 = No, 2 = 22-18 bit, 4 = 23-19 bit, 5 = 24-20 bit,
6 = 20-16 bit. This command is for the professional mode only.

category
Category: the value is from 0 to 0x7f. This command is for the
consumer mode only.

copyright
Copyright: copyrighted (true), non-copyrighted (false). This
command is for the consumer mode only.

original
Original flag: original (true), 1st generation (false). This
command is for the consumer mode only.

AUTHOR

Takashi Iwai

23 Oct 2003 iecset

Ils en parlent aussi

Output to Multiple Audio Devices with Alsa – Eliot Eshelman