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download PDF document: snd_hdspe.4.pdf

SND_HDSPE(4) FreeBSD Kernel Interfaces Manual 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:
o RME HDSPe AIO o 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
sound(4)
HISTORY The snd_hdspe device driver first appeared in FreeBSD 10.0.
AUTHORS 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.
FreeBSD 14.2-RELEASE January 8, 2024 FreeBSD 14.2-RELEASE