Ardour's Tracks/Routes are not capable of handing more than one
MIDI port per per route properly. Most Plugin standards don't support
this either.
However, at this point in time IO::ensure_ports_locked() is not
limited by this restriction!
It is still possible to indirectly add a 2nd MIDI data-buffer
and output-port via plugin pin-management, or simply plugins with
two MIDI output ports when using flexible I/O.
In theory different UIs can show different meter-types, so it
can make sense to maintain the type in different places.
MeterType is a bit-set and PeakMeter implementation provides for this.
However, this is not being used, and the current implementation
was rather fragmented, cross-connected signals to keep types in sync,
allowed inconsistent meter-types in GUI and backend.
MeterType is now kept by meter itself, however it is still
saved/restored as part of the Route state.
N.B. This change breaks the API, various methods have been renamed
for consistency.
Instead of uniformly demote configurations with a non-matching audio
input count (using a penalty offset of 1000), also grade the
impreciseness of the configuration so that those with the nearest input
count are preferred. As for outputs, give a slightly higher handicap to
configuration with too many inputs with regard to the actual audio
inputs that can be fed to the plugin.
POLICY CHANGE: when only imprecise configurations are found the actually
selected one can be different (better) than before this commit.
Just make the code responsible for possible_in > 0 also handle
possible_in == 0 since it nearly does the same thing.
The only difference is that the possible_in == 0 case, by using
FOUNDCFG(), acted as if possible_in was audio_in. The consolidated code
uses FOUNDCFG_IMPRECISE which will add some penalty to the
configurations where desired_in == possible_in != audio_in.
There is thus a small POLICY CHANGE, but the selected configuration will
stay the same unless a better matching configuration is available.
Still no policy change, since when a configuration is chosen that would
have belonged to the second pass, then its penalty will be increased by
1000 and it will be selected only as last recourse.
