dbfsd - DB Fourier Synthesis Daemon

dbfsd [options]

The audio daemon dbfsd serves as the backend part to the DBMix-project. It allows to connect several audio streams and combines them into one, using high quality Fourier synthesis. Connections currently transfer data via pipes; a network (socket) connection method is being developed, but not yet included. Use dbcat or the dbmix XMMS plugin to push audio streams into dbfsd. The mixer settings are controlled via dbmixer.

Dbfsd actually can handle two different output destinations: one is the master device, usually used for the main output; the second one is referred to as the cueing device, which is handy for so-called pre-fade listening. That is, one can check the starting position of the next song, or adjust its pitch before sending it to the main output. Obviously, for stereo output to both the master and the cueing device, two sound cards (or a sound card with two distinct output channels) are needed. The -e switch offers a way to cue with only a single sound card, but output is reduced to mono streams.

-a dev

Set master output device to dev. (Default: /dev/dsp.)

-b dev

Set cue output device to dev. (Default: /dev/dsp2.)

-c

Enable cue output. (Default: cueing disabled.)

-d

Print out debug messages to console. (Default: debugging disabled.)

-e

Output cue as left channel of master out. This option also enables cue output even if -c is not set. (Default: cue to both channels of cue output device.)

-h

Print summary of available options.

-n max

Allow at most max input channels. (Default: 4.)

-o

-r n

Set number of OSS output fragments to n. Decreasing this number will reduce latency between, say, pressing a button in XMMS, and hearing the results of that action. Too low a value, however, will results in drop-outs in the stream. This value can also be adjusted via the preferences dialog in the dbmixer application. (Default: 128.)

-s n

Set number of input channels that should be created as sockets to n. (Default: 0.)

-v

Print version information. (Default: no version information.)

Send master output to stdout. (Default: send output to master output device.)

/tmp/chn_comm

Pipe to input channel n. Direct use of the pipes is deprecated, use dbcat instead. The pipes expect audio input in unsigned 16bit PCM format at 44.1kHz.

dbcat(1), dbin(1), dbmixer(1), dbplaylist(1), dbmix(7).

This manual page was written by Daniel Kobras <kobras@debian.org>, for the Debian GNU/Linux system (but may be used by others). It is heavily based on DBMix's README file written by Robert Michael S Dean.