This changes the realtime preview from using 1 effect for all tracks
to an effect per track (logical track). This should clear up the
bad audio when more than one track (or a stereo track) is present.
An unfortunate side effect is that meter effects no longer work since
the one presented to the user is not the one doing the actual work.
Suggestions on how to remedy this are welcome.
I've made it where you can enable and disable via experimentals:
EXPERIMENTAL_REALTIME_EFFECTS
EXPERIMENTAL_EFFECTS_RACK
You will notice that, as of now, the only effects currently set up for
realtime are VSTs. Now that this is in, I will start converting the
rest.
As I start to convert the effects, the astute of you may notice that
they no longer directly access tracks or any "internal" Audacity
objects. This isolates the effects from changes in Audacity and makes
it much easier to add new ones.
Anyway, all 3 platforms can now display VST effects in graphical mode.
Yes, that means Linux too. There are quite a few VSTs for Linux if
you search for them.
The so-called "rack" definitely needs some discussion, work, and attention
from someone much better at graphics than me. I'm not really sure it should
stay in as-is. I'd originally planned for it to be simply a utility window
where you can store your (preconfigured) favorite effects. It should probably
revert back to that idea.
You may notice that this DOES include the API work I did. The realtime effects
were too tied to it and I didn't want to redo the whole thing. As I mentioned
elsewhere, the API stuff may or may not be very future proof.
So, let the critter complaints commence. I absolute KNOW there will be some.
(I know I'll be hearing from the Linux peeps pretty darn quickly. ;-))
freeze to risk fixing it now. Will readdress after 2.0.5 is
released.
Basically, RingBuffer is ill equiped to handle an input stride
other than 1.
Thanks to Peter for testing this for me.
the job quite nicely...well, given the "stride" information he needs. And in
some cases, it will just use memcpy() so it may improve capture performance a
bit more.
For Resample.* and QualityPrefs.cpp, this commit has my restructuring for distinguishing constant-rate vs variable-rate resamplers more generally. I think it's complete and ready for const-rate, but I have more review and testing to do for the var-rate cases.
Variable-rate resampling is not implemented here, so Time Tracks are still broken, but this is a milestone in getting to a more general and correct structure.
Also I think this fixes AboutDialog issues Steve noticed.
* Fix memory leaks.
* Add comments about initializations and checking for successful results.
* Add checks for NULL deref.
* Consistency in "TODO" vs "TO-DO" comments!
I refactored the code into AudacityApp with a new timer. This is provisional pending discussion - if it is decided that it should go somewhere else I will move it.
Fixed bug in resetting mPrevT1. That caused remaining issue noted in Bug 258 comments 2 and 3.
Moved call to UpdateMeters from TrackPanel::OnTimer() to audacityAudioCallback, where it calls gAudioIO->mOutputMeter->UpdateDisplay(), so the updates are synchronized with Meter Toolbar updates.
Removed unnecessary call to MixerBoard::UpdateMeters() in AudacityProject::UpdateMixerBoard().
Various cleanup.
Patch by Rick Yorgason
I modified it to use linear instead of n squared ring buffer size after verifying that this yields better performance on my mac and pc.
This is just a workaround for what appears to be a portaudio bug, where Pa_OpenStream() resets the device level that port mixer should control.
Looked at portaudio src (pa_win_wmme.c's OpenStream()) but I couldn't find the origin of the problem.
If the Meter Toolbar was monitoring input, PrefsDialog can be opened, but then PrefsDialog::OnOK() needs to StopStream() or AudioIO::HandleDeviceChange() will no-op. We could instead disable the Preferences command while monitoring, i.e., set AudioIONotBusyFlag/AudioIOBusyFlag according to monitoring, as well as gAudioIO->IsAudioTokenActive(). Instead allow it because unlike recording, for example, monitoring is not clearly something that should prohibit opening prefs.
This may have been some of the occasions of bug 29, where user changed device while monitoring, but the AudioIO::HandleDeviceChange() code did not actually change the device, so it look like the user had specificied the motherboard/sound card default device, but Audacity was still using the USB device.
// TO-DO: We *could* be smarter in this method and call HandleDeviceChange()
// only when the device choices actually changed. True of lots of prefs!
// As is, we always stop monitoring and handle the device change.
In AudacityProject::GetUpdateFlags(), don't need to check (GetAudioIOToken() == 0) alternative because gAudioIO->IsAudioTokenActive() checks that it's greater than zero.
In AudioIO.cpp, cleaned up some logic and encapsulation of boolean methods.
