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 commands 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 arguments 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 <bool>
- The professional mode (true) or consumer mode (false).
- audio <bool>
- The audio mode (true) or non-audio mode (false).
- rate <int>
- The sample rate in Hz.
- emphasis <int>
- The emphasis: 0 = none, 1 = 50/15us, 2 = CCITT.
- lock <bool>
- Rate lock: locked (true), unlocked (false). This command is for the
professional mode only.
- sbits <int>
- Sample bits: 2 = 20bit, 4 = 24bit, 6 = undefined. This command is for the
professional mode only.
- wordlength <int>
- 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 <int>
- Category: the value is from 0 to 0x7f. This command is for the consumer
mode only.
- copyright <bool>
- Copyright: copyrighted (true), non-copyrighted (false). This command is
for the consumer mode only.
- original <boo>
- Original flag: original (true), 1st generation (false). This command is
for the consumer mode only.
AUTHOR¶
Takashi Iwai <tiwai@suse.de>