SND_HDSPE(4)

NAME
snd_hdspe - RME HDSPe bridge device driver

SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:

device sound
device snd_hdspe

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

    snd_hdspe_load="YES"

DESCRIPTION
The snd_hdspe bridge driver allows the generic audio driver sound(4) to attach to RME HDSPe audio devices.

HARDWARE
The snd_hdspe driver supports the following audio devices:

•   RME HDSPe AIO
•   RME HDSPe RayDAT

By default, each pcm(4) device corresponds to a physical port on the sound card. For ADAT ports, 8 channel, 4 channel and 2 channel formats are supported. Depending on sample rate and channel format selected, not all pcm channels can be mapped to ADAT channels and vice versa.

SYSCTL TUNABLES
These settings and informational values can be accessed at runtime with the sysctl(8) command. If multiple RME HDSPe sound cards are installed, each device has a separate configuration. To adjust the following sysctl identifiers for a specific sound card, insert the respective device number in place of ‘0’.

dev.hdspe.0.clock_list
    Lists possible clock sources to sync with, depending on the hardware model. This includes internal and external master clocks as well as incoming digital audio signals like AES, S/PDIF and ADAT.

dev.hdspe.0.clock_preference
    Select a preferred clock source from the clock list. HDSPe cards will sync to this clock source when available, but fall back to auto-sync with any other digital clock signal they receive. Set this to ‘internal’ if the HDSPe card should act as master clock.

dev.hdspe.0.clock_source
    Shows the actual clock source in use (read only). This differs from what is set as clock preference when in auto-sync mode.

dev.hdspe.0.sync_status
    Display the current sync status of all external clock sources. Status indications are ‘none’ for no signal at all, ‘lock’ for when a valid signal is present, and ‘sync’ for accurately synchronized signals (required for recording digital audio).

Where appropriate these sysctl values are modeled after official RME software on other platforms, and adopt their terminology. Consult the RME user manuals for additional information.

SEE ALSO
sound(4)

HISTORY
The snd_hdspe device driver first appeared in FreeBSD 10.0.

AUTHORS
-nosplit The snd_hdspe driver was written by Ruslan Bukin <br@bsdpad.com>. Florian Walpen <dev@submerge.ch> contributed clock source settings and restructured the pcm device mapping.