3 May
2017
3 May
'17
1:05 a.m.
Ralf Mardorf <ralf.mardorf(a)alice-dsl.net> writes:
On Tue, 02 May 2017 21:59:48 +0200, David Kastrup
wrote:
hdspmixer works with the Hammerfall DSP but it writes all over the mixer
right on startup. Not suitable for changing single settings: I am using
alsactl for that right now.
I have an RME Hammerfall DSP, a card that I
believe supports --hwmix on
jackd. How does this work? Does this require special support by the
application? If so, which applications exist using it via Jack?
Hi,
I don't know what this option should do [1], maybe you are confusing
it with hwmon. IIUC HWMIX is a feature to use a sound card without a
sound server, but since jack is a sound server, this option might be
irrelevant. I might be mistaken ;).
However, if you want a hardware mixer, you don't need a jack option,
instead try running hdspmixer . I suspect hdspmixer doesn't work
with all RME cards. [1]
[rocketmouse@archlinux ~]$ man jackd | grep hwmix -A3
[rocketmouse@archlinux ~]$ man jackd | grep hwmon -A3
-H, --hwmon
Enable hardware monitoring of capture ports. This is a
method for obtaining "zero latency" mon‐ itoring of audio input.
It requires support in hardware and from the underlying ALSA device
driver. --
(M-Audio Delta series, Terratec, and others) support
--hwmon. In the future, some consumer cards may also be supported by
modifying their mixer settings.
Without --hwmon, port monitoring requires JACK to read
audio into system memory, then copy it back out to
the hardware again, imposing the basic JACK system
latency determined by the --period and --nperiods
parameters.
Sigh, you are right. But the question remains: What applications will
support this and what does it mean? For example, the DSP Hammerfall has
about two dozen inputs and about two dozen outputs. What does "hardware
monitoring of capture ports" mean then? Where are they monitored to by
which application?
--
David Kastrup