Man page - jack-stdin(1)

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Manual

JACK-STDIN

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
EXAMPLES
KNOWN ISSUES
AUTHOR
SEE ALSO

NAME

jack-stdin - write JACK audio data to stdin

SYNOPSIS

jack-stdin

[ OPTIONS ] port1 [ port2 ...]

DESCRIPTION

jack-stdin reads raw audio data from standard-input and writes it to a JACK audio port.

The number of given ports detemine the number of audio channels that are used. If more than one channel is given, the input audio-sample data needs to be interleaved.

OPTIONS

-b , --bitdepth BITS

Specify the bit-depth of each sample. For integer-encoding this can be 16 or 24. The default is 16. This setting is only used for integer encoding: Floating-point samples will always be 32 bit wide.

-d , --duration SEC

Specify the time for which jack-stdin should run in seconds. A value less than 1 means to run indefinitely. The default is 0 which reads until end-of-file.

-e , --encoding FORMAT

Set the input format of the data: signed-integer, unsigned-integer, floating-point (default: signed)

-n , --name CLIENTNAME

Set JACK client name (default: jstdin)

-f , --file FILENAME

Read data from given file instead of standard-input.

-h , --help

Print a brief usage information

-p , --prebuffer PERCENT

Pre-fill the buffer before starting audio output to JACK (default 50.0%). NOTE: disable pre-buffering (-p 0) or use a small buffer size to play back very short samples.

-L , --little-endian

The input-data is in little-endian byte-order or native-byte-order float (this is the default)

-B , --big-endian

Interpret input audio data in big-endian byte-order or swap the byte-order of floating-point.

-q , --quiet

Inhibit usual output. This affects information and buffer-overflow warnings but not setup-errors.

-S , --bufsize SAMPLES

Choose the internal buffer-size in samples. The default size is 65536. The given value will be multiplied by the number of channels and bit-depth to get the size of the ring-buffer. Note: the buffersize must be larger than JACK’s period size.

EXAMPLES

jack-stdout vlc_31994:out_1 vlc_31994:out_2 \

		\| sox -t raw -r 48k -e signed -b 16 -c 2 - \
		-t raw -r 48k -e signed -b 16 -c 2 - \
		tremolo 5 100 \
		\| ./jack-stdin system:playback_1 system:playback_2

cat /dev/dsp \

| jack-stdin system:playback_1 system:playback_2

KNOWN ISSUES

jack-stdin is not suitable to play-back files shorter than twice the jack-period size.

AUTHOR

Robin Gareus <robin@gareus.org>.