Thanks Stefan, great to see steady progress here.
But note that travis-ci shows, that your changes broke the syndrum audio test in all build variants, please take a look at that.
About volume clamping, taking a look at other DAWs suggests that this should be done at the UI and doesn't need to be based on consts from the IDL at all.
Also the property descriptios read "Volume adjustment in decibel of left/right bus channel" and that's what we should make them. I.e. we should pass actual dB values, e.g. 96 as property value through the IDL layer. (*1)
About GParamSpec containing minus, that's because GLib enforces '-' instead of '_' in the pspec names, so we're forced to work around that in other places as well. Please take a look at name_to_identifier in bstparam.cc, seems like it's time to move that to bstutils.hh to avoid gratituous duplicatoin everywhere.
About porting object / sequence properties, I'm actually not sure what's missing there atm. If you want to make an attempt at porting such a property and nag me about missing bits in the IDL layer or similar, that'd be ok as well.
+ for (auto& c : pname)
pointers and references are written with *& attached to the variable, i.e. write this as "auto &c"
+ Const BUS_VOLUME_MIN = 1.58489319246111e-05; /* -96dB */
if at all, this should be using '96' as Const value, and the const be defined in terms of dB. but in other DAWs, the dB range displayed is a function of the UI, e.g. the volume meter of a track display my use different limits than for a related bus channel volume meter.
+ self->right_volume = self->left_volume = center_volume (self->right_volume, self->left_volume);
While you're at it, please make that a two liner.
Modern code analysis tools tend to choke on using an assignment as rvalue, and its still very readable if it's just:
self->left_volume = center_volume (self->right_volume, self->left_volume);
self->right_volume = self->left_volume;
+ return (self == master);
Please remove extraneous parenthesis like these, they could hide an assignment.
+ auto parent = BSE_ITEM (self)->parent;
Please don't use 'auto' here, but BseItem*, like you did in other places. The reason here is that the variable is the result of a hidden C-style cast (BSE_ITEM()) and used as input for another C-style cast (BSE_SONG), so the actual type used here is completely unclear to the reader and potentially hiding a type bug.
On a side note, it took a while, but I figured again the point of saved_sync. It's clearly trying to preserve the 'sync' state around loading a BSE file (termed 'restore' in the API), and sets that initially to FALSE to allow BSE files to restore different left and right volumes, and syncs thouse only if "sync" is also set or after the restore phase is completed. That heavily depends on the order in which the properties are defined in the BSE file which is somewhat fragile... (*2)
I get the feeling that the old API is a bit too low level with using synced volume factors instead of actual dB values. (*1) and (*2) are both indications that we should probably move towards something like:
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