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jack-stdin - Online in the Cloud

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This is the command jack-stdin that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



jack-stdin - write JACK audio data to stdin


jack-stdin [OPTIONS] port1 [ port2 ...]


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.


-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)

-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

-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

-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.


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


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

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