Variables by these names are only used from the local wscript and when
running "waf configure", which already for other reasons only can run at
the top-level.
These variables are thus not mandatory and not used.
This is mainly for RME RayDAT that has a fixed buffersize of 16k:
dev_name : hw:HDSPMxc2f6c5,0
channels : 36
min_rate : 32000
max_rate : 192000
min_bufz : 16384
max_bufz : 16384
min_nper : 4
max_nper : 512
However nperiod configuration determines the effective latency
regardless.
This is similar to https://github.com/jackaudio/jack1/blob/master/drivers/alsa/alsa_driver.c#L476-L486
buffer-size = periods * period-size
Previously, buffersize was used for period-size.
This fixes an issue with a dedicated .asoundrc configuring a specific
period-size or buffer-size that has to be exact.
Ardour's device configuration failed in this case.
This has not been an issues since most hardware devices offer a wide
range: 8 < period-size < 262144 ; 16 < buffer-size < 524288.
Only a subset of which (32 .8192) is allowed by Ardour.
The backend will replace the information in the last bracket (IO)
of the name with (In/Out) when creating pretty port-names from the
device-name. -- see replace_name_io().
This fixes an issue with device-name number suffixes in brackets.
The engine setup identifies devices by name (device list is a map<>
with the device-name as key). To support multiple devices with the
same name, the name needs to be unique.
So far this is achieved by simply adding a number suffix starting with
the 2nd device (this allows to re-use configurations).
Ideally we'd use UUIDs or unique device IDs to handle this, and also
somehow clarify which device is which...
Use pbd/string_convert.h API instead of std::ostream for numeric formatting to
remain locale independent and not have to use a LocaleGuard. The formatting is
equivalent
uselib is no longer implicit (inherited by .use). This is still incomplete,
some uselibs for non-linux variants may be missing.
bld.is_defined("HAVE_XXX") also no longer works and will have to be
changed (I think to bld.env["HAVE_XXX"]) in countless places.
