.\" Copyright (c) 2012 Ruslan Bukin .\" Copyright (c) 2024 Florian Walpen .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .Dd October 28, 2024 .Dt SND_HDSP 4 .Os .Sh NAME .Nm snd_hdsp .Nd "RME HDSP bridge device driver" .Sh SYNOPSIS To compile this driver into the kernel, place the following lines in your kernel configuration file: .Bd -ragged -offset indent .Cd "device sound" .Cd "device snd_hdsp" .Ed .Pp Alternatively, to load the driver as a module at boot time, place the following line in .Xr loader.conf 5 : .Bd -literal -offset indent snd_hdsp_load="YES" .Ed .Sh DESCRIPTION The .Nm bridge driver allows the generic audio driver .Xr sound 4 to attach to RME HDSP audio devices. .Sh HARDWARE The .Nm driver supports the following audio devices: .Pp .Bl -bullet -compact .It RME HDSP 9632 (optional AO4S-192 and AIS-192 extension boards) .It RME HDSP 9652 .El .Pp By default, each .Xr 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. The effective number of ADAT channels is 8 channels at single speed (32kHz-48kHz) and 4 channels at double speed (64kHz-96kHz). Only the HDSP 9632 can operate at quad speed (128kHz-192kHz), ADAT is disabled in this mode. Depending on sample rate and channel format selected, not all pcm channels can be mapped to ADAT channels and vice versa. .Sh LOADER TUNABLES These settings can be entered at the .Xr loader 8 prompt or in .Xr loader.conf 5 . .Bl -tag -width indent .It Va hw.hdsp.unified_pcm If set to 1, all physical ports are combined into one unified pcm device. When opened in multi-channel audio software, this makes all ports available at the same time, and fully synchronized. For resulting channel numbers consult the following table: .El .Bl -column "Sound Card" "Single Speed" "Double Speed" "Quad Speed" .Sy "Sound Card" Ta Sy "Single Speed" Ta Sy "Double Speed" Ta Sy "Quad Speed" .It "" Ta "Play | Rec" Ta "Play | Rec" Ta "Play | Rec" .It HDSP 9632 Ta " 16 | 16" Ta " 12 | 12" Ta " 8 | 8" .It HDSP 9652 Ta " 26 | 26" Ta " 14 | 14" Ta " - | -" .El .Sh SYSCTL TUNABLES These settings and informational values can be accessed at runtime with the .Xr sysctl 8 command. If multiple RME HDSP 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 .Ql 0 . .Bl -tag -width indent .It Va dev.hdsp.0.sample_rate Set a fixed sample rate from 32000, 44100, 48000, up to 192000. This is usually required for digital connections (AES, S/PDIF, ADAT). The default value of 0 adjusts the sample rate according to pcm device settings. .It Va dev.hdsp.0.period The number of samples processed per interrupt, from 32, 64, 128, up to 4096. Setting a lower value here results in less latency, but increases system load due to frequent interrupt processing. Extreme values may cause audio gaps and glitches. .It Va dev.hdsp.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. .It Va dev.hdsp.0.clock_preference Select a preferred clock source from the clock list. HDSP 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 .Ql internal if the HDSP card should act as master clock. .It Va dev.hdsp.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. .It Va dev.hdsp.0.sync_status Display the current sync status of all external clock sources. Status indications are .Ql none for no signal at all, .Ql lock for when a valid signal is present, and .Ql sync for accurately synchronized signals (required for recording digital audio). .El .Pp The following tunables are applicable to HDSP 9632 devices only: .Bl -tag -width indent .It Va dev.hdsp.0.input_level Select the sensitivity of the analog line input. Available reference levels for the input signal are .Ql LowGain , .Ql +4dBu and .Ql -10dBV . .It Va dev.hdsp.0.output_level Select the gain level of the analog line output. Available reference levels for the output signal are .Ql HighGain , .Ql +4dBu and .Ql -10dBV . .It Va dev.hdsp.0.phones_level Adjust the gain level of the phones output, separately from the analog line output. The signal can be lowered by 6 or 12 dB. .El .Pp 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. .Sh SEE ALSO .Xr sound 4 .Sh HISTORY The .Nm device driver first appeared in .Fx 15.0 . .Sh AUTHORS .An -nosplit Based on .Xr snd_hdspe 4 originally written by .An Ruslan Bukin . All adaptation to HDSP cards by .An Florian Walpen .